@page "/jobs/new"
@page "/jobs/{Id:int}"
@inject JobService JobService
@inject MaterialService MaterialService
@inject CutListPackingService PackingService
@inject NavigationManager Navigation
@inject IJSRuntime JS
@using CutList.Core
@using CutList.Core.Nesting
@using CutList.Core.Formatting
@using CutList.Web.Data.Entities

<PageTitle>@(IsNew ? "New Job" : job.DisplayName)</PageTitle>

<div class="d-flex justify-content-between align-items-center mb-3">
    <h1 class="job-title">@(IsNew ? "New Job" : job.DisplayName)</h1>
    <a href="jobs" class="btn btn-outline-secondary">Back to Jobs</a>
</div>

@if (!IsNew && job.IsLocked)
{
    <div class="alert alert-warning d-flex justify-content-between align-items-center mb-3 print-screen-only">
        <div>
            <i class="bi bi-lock-fill me-2"></i>
            <strong>This job is locked</strong> — locked on @job.LockedAt!.Value.ToLocalTime().ToString("g"). Unlock to make changes.
        </div>
        <button class="btn btn-outline-warning btn-sm" @onclick="UnlockJob">
            <i class="bi bi-unlock"></i> Unlock Job
        </button>
    </div>
}

@if (!string.IsNullOrEmpty(loadError))
{
    <div class="alert alert-danger">
        <h5>Error loading job</h5>
        <pre class="mb-0">@loadError</pre>
    </div>
}
else if (loading)
{
    <p><em>Loading...</em></p>
}
else if (IsNew)
{
    <!-- New Job: Simple form -->
    <div class="row">
        <div class="col-lg-6">
            @RenderDetailsForm()
        </div>
    </div>
}
else
{
    <!-- Existing Job: Tabbed interface -->
    <ul class="nav nav-tabs mb-3" role="tablist">
        <li class="nav-item" role="presentation">
            <button class="nav-link @(activeTab == Tab.Details ? "active" : "")"
                    @onclick="() => SetTab(Tab.Details)" type="button">
                Details
            </button>
        </li>
        <li class="nav-item" role="presentation">
            <button class="nav-link @(activeTab == Tab.Parts ? "active" : "")"
                    @onclick="() => SetTab(Tab.Parts)" type="button">
                Parts
                @if (job.Parts.Count > 0)
                {
                    <span class="badge bg-secondary ms-1">@job.Parts.Sum(p => p.Quantity)</span>
                }
            </button>
        </li>
        <li class="nav-item" role="presentation">
            <button class="nav-link @(activeTab == Tab.Stock ? "active" : "")"
                    @onclick="() => SetTab(Tab.Stock)" type="button">
                Stock
                @if (job.Stock.Count > 0)
                {
                    <span class="badge bg-secondary ms-1">@job.Stock.Count</span>
                }
            </button>
        </li>
        <li class="nav-item" role="presentation">
            <button class="nav-link @(activeTab == Tab.Results ? "active" : "")"
                    @onclick="() => SetTab(Tab.Results)" type="button">
                Results
                @if (summary != null)
                {
                    <span class="badge bg-success ms-1">@summary.Efficiency.ToString("F0")%</span>
                }
            </button>
        </li>
    </ul>

    <div class="tab-content">
        @if (activeTab == Tab.Details)
        {
            <div class="row">
                <div class="col-lg-6">
                    @RenderDetailsForm()
                </div>
            </div>
        }
        else if (activeTab == Tab.Parts)
        {
            @RenderPartsTab()
        }
        else if (activeTab == Tab.Stock)
        {
            @RenderStockTab()
        }
        else if (activeTab == Tab.Results)
        {
            @RenderResultsTab()
        }
    </div>
}

@* Part Modal Dialog *@
@if (showPartForm)
{
    <div class="modal fade show d-block" tabindex="-1" style="background-color: rgba(0,0,0,0.5);">
        <div class="modal-dialog modal-lg">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">@(editingPart == null ? "Add Parts" : "Edit Part")</h5>
                    <button type="button" class="btn-close" @onclick="CancelPartForm"></button>
                </div>
                <div class="modal-body">
                    <div class="row g-3 mb-3">
                        <div class="col-md-6">
                            <label class="form-label">Shape</label>
                            <select class="form-select" @bind="selectedShape" @bind:after="OnShapeChanged"
                                    disabled="@(editingPart != null)">
                                <option value="">-- Select --</option>
                                @foreach (var shape in DistinctShapes)
                                {
                                    <option value="@shape">@shape.GetDisplayName()</option>
                                }
                            </select>
                        </div>
                        <div class="col-md-6">
                            <label class="form-label">Size</label>
                            <select class="form-select" @bind="partSelectedMaterialId" disabled="@(!selectedShape.HasValue || editingPart != null)">
                                <option value="0">-- Select --</option>
                                @foreach (var material in FilteredMaterials)
                                {
                                    <option value="@material.Id">@material.Size</option>
                                }
                            </select>
                        </div>
                    </div>

                    @if (editingPart != null)
                    {
                        @* Edit mode: single row *@
                        <div class="row g-3">
                            <div class="col-md-4">
                                <label class="form-label">Length</label>
                                <LengthInput @bind-Value="newPart.LengthInches" />
                            </div>
                            <div class="col-md-4">
                                <label class="form-label">Quantity</label>
                                <input type="number" class="form-control" @bind="newPart.Quantity" min="1" />
                            </div>
                            <div class="col-md-4">
                                <label class="form-label">Name <span class="text-muted fw-normal">(optional)</span></label>
                                <input type="text" class="form-control" @bind="newPart.Name" placeholder="Part name" />
                            </div>
                        </div>
                    }
                    else
                    {
                        @* Add mode: multi-row table *@
                        <table class="table table-sm align-middle mb-2">
                            <thead>
                                <tr>
                                    <th>Length</th>
                                    <th style="width: 100px;">Qty</th>
                                    <th>Name <span class="text-muted fw-normal">(optional)</span></th>
                                    <th style="width: 50px;"></th>
                                </tr>
                            </thead>
                            <tbody>
                                @for (var i = 0; i < partRows.Count; i++)
                                {
                                    var row = partRows[i];
                                    <tr>
                                        <td><LengthInput @bind-Value="row.LengthInches" /></td>
                                        <td><input type="number" class="form-control form-control-sm" @bind="row.Quantity" @bind:event="oninput" min="1" /></td>
                                        <td><input type="text" class="form-control form-control-sm" @bind="row.Name" @bind:event="oninput" placeholder="Part name" /></td>
                                        <td>
                                            @if (partRows.Count > 1)
                                            {
                                                <button type="button" class="btn btn-sm btn-outline-danger" @onclick="() => RemovePartRow(row)" title="Remove">
                                                    <i class="bi bi-x-lg"></i>
                                                </button>
                                            }
                                        </td>
                                    </tr>
                                }
                            </tbody>
                        </table>
                        <button type="button" class="btn btn-sm btn-outline-secondary" @onclick="AddPartRow">
                            <i class="bi bi-plus-lg me-1"></i>Add Row
                        </button>
                    }

                    @if (!string.IsNullOrEmpty(partErrorMessage))
                    {
                        <div class="alert alert-danger mt-3 mb-0">@partErrorMessage</div>
                    }
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-outline-secondary" @onclick="CancelPartForm">Cancel</button>
                    <button type="button" class="btn btn-primary" @onclick="SavePartAsync">
                        @if (editingPart != null)
                        {
                            <text>Save Changes</text>
                        }
                        else
                        {
                            <text>Add @partRows.Count Part@(partRows.Count != 1 ? "s" : "")</text>
                        }
                    </button>
                </div>
            </div>
        </div>
    </div>
}

@* Add/Edit Stock Modal *@
@if (showStockModal)
{
    <div class="modal fade show d-block" tabindex="-1" style="background-color: rgba(0,0,0,0.5);">
        <div class="modal-dialog modal-lg">
            <div class="modal-content">
                <div class="modal-header">
                    <h5 class="modal-title">@(editingStock == null ? "Add Stock" : "Edit Stock")</h5>
                    <button type="button" class="btn-close" @onclick="CloseStockModal"></button>
                </div>
                <div class="modal-body">
                    @if (editingStock == null)
                    {
                        <ul class="nav nav-tabs mb-3" role="tablist">
                            <li class="nav-item" role="presentation">
                                <button class="nav-link @(stockModalTab == StockModalTab.Inventory ? "active" : "")"
                                        type="button" disabled="@(job.Parts.Count == 0)"
                                        title="@(job.Parts.Count == 0 ? "Add parts first to match against inventory" : "")"
                                        @onclick="() => stockModalTab = StockModalTab.Inventory">
                                    From Inventory
                                </button>
                            </li>
                            <li class="nav-item" role="presentation">
                                <button class="nav-link @(stockModalTab == StockModalTab.Custom ? "active" : "")"
                                        type="button"
                                        @onclick="() => stockModalTab = StockModalTab.Custom">
                                    Custom Length
                                </button>
                            </li>
                        </ul>
                    }

                    @if (stockModalTab == StockModalTab.Inventory && editingStock == null)
                    {
                        @if (loadingImport)
                        {
                            <div class="text-center py-4">
                                <span class="spinner-border"></span>
                                <p class="mt-2 text-muted">Finding matching stock...</p>
                            </div>
                        }
                        else if (importCandidates.Count == 0)
                        {
                            <div class="text-center py-4 text-muted">
                                <p class="mb-2">No matching inventory stock found.</p>
                                <p class="small">Either no stock items exist for the materials in your parts, or they have already been added to this job.</p>
                            </div>
                        }
                        else
                        {
                            <div class="d-flex justify-content-between align-items-center mb-3">
                                <div class="btn-group btn-group-sm">
                                    <button class="btn btn-outline-secondary" @onclick="() => ToggleAllImportCandidates(true)">Select All</button>
                                    <button class="btn btn-outline-secondary" @onclick="() => ToggleAllImportCandidates(false)">Select None</button>
                                </div>
                                <small class="text-muted">@importCandidates.Count(c => c.Selected) of @importCandidates.Count selected</small>
                            </div>

                            @foreach (var group in importCandidates
                                .GroupBy(c => c.StockItem.MaterialId)
                                .OrderBy(g => g.First().StockItem.Material.Shape)
                                .ThenBy(g => g.First().StockItem.Material.Size))
                            {
                                var material = group.First().StockItem.Material;
                                <h6 class="mt-3 mb-2 text-primary">@material.DisplayName</h6>
                                <table class="table table-sm table-hover mb-0">
                                    <thead>
                                        <tr>
                                            <th style="width: 40px;"></th>
                                            <th>Length</th>
                                            <th style="width: 120px;">Qty to Use</th>
                                            <th style="width: 100px;">Priority</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        @foreach (var candidate in group.OrderByDescending(c => c.StockItem.LengthInches))
                                        {
                                            <tr class="@(candidate.Selected ? "" : "text-muted")">
                                                <td>
                                                    <input type="checkbox" class="form-check-input" @bind="candidate.Selected" />
                                                </td>
                                                <td>@ArchUnits.FormatFromInches((double)candidate.StockItem.LengthInches)</td>
                                                <td>
                                                    <input type="number" class="form-control form-control-sm" @bind="candidate.Quantity"
                                                           min="-1" disabled="@(!candidate.Selected)" />
                                                    <small class="text-muted">-1 = unlimited</small>
                                                </td>
                                                <td>
                                                    <input type="number" class="form-control form-control-sm" @bind="candidate.Priority"
                                                           min="1" disabled="@(!candidate.Selected)" />
                                                </td>
                                            </tr>
                                        }
                                    </tbody>
                                </table>
                            }
                        }
                        @if (!string.IsNullOrEmpty(importErrorMessage))
                        {
                            <div class="alert alert-danger mt-3 mb-0">@importErrorMessage</div>
                        }
                    }
                    else if (stockModalTab == StockModalTab.Inventory && editingStock != null)
                    {
                        <div class="row g-3">
                            <div class="col-md-3">
                                <label class="form-label">Shape</label>
                                <select class="form-select" @bind="stockSelectedShape" @bind:after="OnStockShapeChanged">
                                    <option value="">-- Select --</option>
                                    @foreach (var shape in DistinctShapes)
                                    {
                                        <option value="@shape">@shape.GetDisplayName()</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Size</label>
                                <select class="form-select" @bind="stockSelectedMaterialId" @bind:after="OnStockMaterialChanged"
                                        disabled="@(!stockSelectedShape.HasValue)">
                                    <option value="0">-- Select --</option>
                                    @foreach (var material in materials.Where(m => stockSelectedShape.HasValue && m.Shape == stockSelectedShape.Value).OrderBy(m => m.SortOrder).ThenBy(m => m.Size))
                                    {
                                        <option value="@material.Id">@material.Size</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Stock Length</label>
                                <select class="form-select" @bind="newStock.StockItemId" disabled="@(stockSelectedMaterialId == 0)">
                                    <option value="">-- Select --</option>
                                    @foreach (var stock in availableStockItems)
                                    {
                                        <option value="@stock.Id">@ArchUnits.FormatFromInches((double)stock.LengthInches)</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Qty to Use</label>
                                <input type="number" class="form-control" @bind="newStock.Quantity" min="-1" />
                                <small class="text-muted">-1 = unlimited</small>
                            </div>
                        </div>
                        <div class="row g-3 mt-1">
                            <div class="col-md-3">
                                <label class="form-label">Priority</label>
                                <input type="number" class="form-control" @bind="newStock.Priority" min="1" />
                                <small class="text-muted">Lower = used first</small>
                            </div>
                        </div>
                        @if (!string.IsNullOrEmpty(stockErrorMessage))
                        {
                            <div class="alert alert-danger mt-3 mb-0">@stockErrorMessage</div>
                        }
                    }
                    else
                    {
                        <div class="row g-3">
                            <div class="col-md-3">
                                <label class="form-label">Shape</label>
                                <select class="form-select" @bind="stockSelectedShape" @bind:after="OnStockShapeChanged">
                                    <option value="">-- Select --</option>
                                    @foreach (var shape in DistinctShapes)
                                    {
                                        <option value="@shape">@shape.GetDisplayName()</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Size</label>
                                <select class="form-select" @bind="newStock.MaterialId" disabled="@(!stockSelectedShape.HasValue)">
                                    <option value="0">-- Select --</option>
                                    @foreach (var material in materials.Where(m => stockSelectedShape.HasValue && m.Shape == stockSelectedShape.Value).OrderBy(m => m.SortOrder).ThenBy(m => m.Size))
                                    {
                                        <option value="@material.Id">@material.Size</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Length</label>
                                <LengthInput @bind-Value="newStock.LengthInches" />
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Quantity</label>
                                <input type="number" class="form-control" @bind="newStock.Quantity" min="-1" />
                                <small class="text-muted">Use -1 for unlimited</small>
                            </div>
                        </div>
                        <div class="row g-3 mt-1">
                            <div class="col-md-3">
                                <label class="form-label">Priority</label>
                                <input type="number" class="form-control" @bind="newStock.Priority" min="1" />
                                <small class="text-muted">Lower = used first</small>
                            </div>
                        </div>
                        @if (!string.IsNullOrEmpty(stockErrorMessage))
                        {
                            <div class="alert alert-danger mt-3 mb-0">@stockErrorMessage</div>
                        }
                    }
                </div>
                <div class="modal-footer">
                    <button type="button" class="btn btn-outline-secondary" @onclick="CloseStockModal">Cancel</button>
                    @if (stockModalTab == StockModalTab.Inventory && editingStock == null)
                    {
                        @if (importCandidates.Count > 0)
                        {
                            <button type="button" class="btn btn-primary" @onclick="ImportSelectedStockAsync"
                                    disabled="@(!importCandidates.Any(c => c.Selected))">
                                Import @importCandidates.Count(c => c.Selected) Item@(importCandidates.Count(c => c.Selected) != 1 ? "s" : "")
                            </button>
                        }
                    }
                    else if (stockModalTab == StockModalTab.Inventory && editingStock != null)
                    {
                        <button type="button" class="btn btn-primary" @onclick="SaveStockFromInventoryAsync">Save Changes</button>
                    }
                    else
                    {
                        <button type="button" class="btn btn-primary" @onclick="SaveCustomStockAsync">
                            @(editingStock == null ? "Add Stock" : "Save Changes")
                        </button>
                    }
                </div>
            </div>
        </div>
    </div>
}

@code {
    private enum Tab { Details, Parts, Stock, Results }

    [Parameter]
    public int? Id { get; set; }

    private Job job = new();
    private List<Material> materials = new();
    private List<CuttingTool> cuttingTools = new();

    private bool loading = true;
    private string? loadError;
    private bool savingJob;
    private string? jobErrorMessage;
    private Tab activeTab = Tab.Details;

    private void SetTab(Tab tab) => activeTab = tab;

    // Parts form
    private bool showPartForm;
    private JobPart newPart = new();
    private JobPart? editingPart;
    private string? partErrorMessage;
    private MaterialShape? selectedShape;
    private int partSelectedMaterialId;
    private List<PartRow> partRows = new();

    // Stock modal (unified add/edit, both inventory-sourced and custom-length)
    private enum StockModalTab { Inventory, Custom }
    private bool showStockModal;
    private StockModalTab stockModalTab = StockModalTab.Inventory;
    private JobStock newStock = new();
    private JobStock? editingStock;
    private string? stockErrorMessage;
    private MaterialShape? stockSelectedShape;
    private int stockSelectedMaterialId;
    private List<StockItem> availableStockItems = new();
    private bool loadingImport;
    private List<ImportStockCandidate> importCandidates = new();
    private string? importErrorMessage;

    // Results tab
    private MultiMaterialPackResult? packResult;
    private MultiMaterialPackingSummary? summary;
    private bool optimizing;
    private bool lockingJob;
    private bool showLengthsInInches = true;

    private IEnumerable<MaterialShape> DistinctShapes => materials.Select(m => m.Shape).Distinct().OrderBy(s => s);
    private IEnumerable<Material> FilteredMaterials => !selectedShape.HasValue
        ? Enumerable.Empty<Material>()
        : materials.Where(m => m.Shape == selectedShape.Value).OrderBy(m => m.SortOrder).ThenBy(m => m.Size);

    private bool IsNew => !Id.HasValue;
    private bool CanOptimize => job.Parts.Count > 0 && job.CuttingToolId != null;
    private string FormatResultLength(double inches) => showLengthsInInches
        ? ArchUnits.FormatInches(inches)
        : ArchUnits.FormatFromInches(inches);

    private async Task UnlockJob()
    {
        if (Id.HasValue)
        {
            await JobService.UnlockAsync(Id.Value);
            job = (await JobService.GetByIdAsync(Id.Value))!;
        }
    }

    protected override async Task OnInitializedAsync()
    {
        try
        {
            materials = await MaterialService.GetAllAsync();
            cuttingTools = await JobService.GetCuttingToolsAsync();

            if (Id.HasValue)
            {
                var existing = await JobService.GetByIdAsync(Id.Value);
                if (existing == null)
                {
                    Navigation.NavigateTo("jobs");
                    return;
                }
                job = existing;

                // Load saved optimization results if available
                if (job.OptimizationResultJson != null)
                {
                    await LoadSavedResultsAsync();
                }
            }
            else
            {
                // Set default cutting tool for new jobs
                var defaultTool = await JobService.GetDefaultCuttingToolAsync();
                if (defaultTool != null)
                {
                    job.CuttingToolId = defaultTool.Id;
                }
            }
        }
        catch (Exception ex)
        {
            loadError = ex.ToString();
        }

        loading = false;
    }

    private async Task LoadSavedResultsAsync()
    {
        try
        {
            packResult = await PackingService.LoadSavedResultAsync(job.OptimizationResultJson!);
            if (packResult != null)
            {
                summary = PackingService.GetSummary(packResult);
            }
        }
        catch
        {
            // Invalid JSON — treat as no results
            packResult = null;
            summary = null;
        }
    }

    private RenderFragment RenderDetailsForm() => __builder =>
    {
        <div class="card">
            <div class="card-header">
                <h5 class="mb-0">Job Details</h5>
            </div>
            <div class="card-body">
                <EditForm Model="job" OnValidSubmit="SaveJobAsync">
                    <fieldset disabled="@job.IsLocked">
                        @if (!IsNew)
                        {
                            <div class="mb-3">
                                <label class="form-label">Job Number</label>
                                <input type="text" class="form-control" value="@job.JobNumber" readonly />
                            </div>
                        }

                        <div class="mb-3">
                            <label class="form-label">Job Name <span class="text-muted fw-normal">(optional)</span></label>
                            <InputText class="form-control" @bind-Value="job.Name" placeholder="Descriptive name for this job" />
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Customer <span class="text-muted fw-normal">(optional)</span></label>
                            <InputText class="form-control" @bind-Value="job.Customer" placeholder="Customer name" />
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Cutting Tool</label>
                            <InputSelect class="form-select" @bind-Value="job.CuttingToolId">
                                <option value="">-- Select Tool --</option>
                                @foreach (var tool in cuttingTools)
                                {
                                    <option value="@tool.Id">@tool.Name (@tool.KerfInches" kerf)</option>
                                }
                            </InputSelect>
                        </div>

                        <div class="mb-3">
                            <label class="form-label">Notes</label>
                            <InputTextArea class="form-control" @bind-Value="job.Notes" rows="3" />
                        </div>

                        @if (!string.IsNullOrEmpty(jobErrorMessage))
                        {
                            <div class="alert alert-danger">@jobErrorMessage</div>
                        }

                        <div class="d-flex gap-2">
                            <button type="submit" class="btn btn-primary" disabled="@savingJob">
                                @if (savingJob)
                                {
                                    <span class="spinner-border spinner-border-sm me-1"></span>
                                }
                                @(IsNew ? "Create Job" : "Save")
                            </button>
                            <a href="jobs" class="btn btn-outline-secondary">Back</a>
                        </div>
                    </fieldset>
                </EditForm>
            </div>
        </div>
    };

    private RenderFragment RenderPartsTab() => __builder =>
    {
        <div class="card">
            <div class="card-header d-flex justify-content-between align-items-center">
                <h5 class="mb-0">Parts to Cut</h5>
                @if (!job.IsLocked)
                {
                    <button class="btn btn-primary" @onclick="ShowAddPartForm">Add Part</button>
                }
            </div>
            <div class="card-body">
                @if (job.Parts.Count == 0)
                {
                    <div class="text-center py-4 text-muted">
                        <p class="mb-2">No parts added yet.</p>
                        <p class="small">Add the parts you need to cut, selecting the material for each.</p>
                    </div>
                }
                else
                {
                    <div class="table-responsive">
                        <table class="table table-hover mb-0">
                            <thead>
                                <tr>
                                    <th>Material</th>
                                    <th>Length</th>
                                    <th>Qty</th>
                                    <th>Name</th>
                                    <th style="width: 120px;">Actions</th>
                                </tr>
                            </thead>
                            <tbody>
                                @foreach (var part in job.Parts)
                                {
                                    <tr>
                                        <td>@part.Material.DisplayName</td>
                                        <td>@ArchUnits.FormatFromInches((double)part.LengthInches) <span class="text-muted">(@(part.LengthInches)")</span></td>
                                        <td>@part.Quantity</td>
                                        <td>@(string.IsNullOrWhiteSpace(part.Name) ? "-" : part.Name)</td>
                                        <td>
                                            @if (!job.IsLocked)
                                            {
                                                <div class="table-actions">
                                                    <button class="btn btn-sm btn-outline-primary" @onclick="() => EditPart(part)" title="Edit"><i class="bi bi-pencil"></i></button>
                                                    <button class="btn btn-sm btn-outline-danger" @onclick="() => DeletePart(part)" title="Delete"><i class="bi bi-trash"></i></button>
                                                </div>
                                            }
                                        </td>
                                    </tr>
                                }
                            </tbody>
                        </table>
                    </div>
                    <div class="mt-3 text-muted">
                        Total: @job.Parts.Sum(p => p.Quantity) pieces
                    </div>
                }
            </div>
        </div>
    };

    private async Task SaveJobAsync()
    {
        jobErrorMessage = null;
        savingJob = true;

        try
        {
            if (IsNew)
            {
                var created = await JobService.CreateAsync(job);
                Navigation.NavigateTo($"jobs/{created.Id}");
            }
            else
            {
                await JobService.UpdateAsync(job);
                job = (await JobService.GetByIdAsync(Id!.Value))!;
                // Clear in-memory results since they were invalidated
                packResult = null;
                summary = null;
            }
        }
        finally
        {
            savingJob = false;
        }
    }

    // Parts methods
    private void ShowAddPartForm()
    {
        editingPart = null;
        newPart = new JobPart { JobId = Id!.Value, Quantity = 1 };
        selectedShape = null;
        partSelectedMaterialId = 0;
        partRows = new List<PartRow> { new PartRow() };
        showPartForm = true;
        partErrorMessage = null;
    }

    private void OnShapeChanged()
    {
        partSelectedMaterialId = 0;
        newPart.MaterialId = 0;
    }

    private void AddPartRow()
    {
        partRows.Add(new PartRow());
    }

    private void RemovePartRow(PartRow row)
    {
        partRows.Remove(row);
    }

    private void EditPart(JobPart part)
    {
        editingPart = part;
        newPart = new JobPart
        {
            Id = part.Id,
            JobId = part.JobId,
            MaterialId = part.MaterialId,
            Name = part.Name,
            LengthInches = part.LengthInches,
            Quantity = part.Quantity,
            SortOrder = part.SortOrder
        };
        selectedShape = part.Material?.Shape;
        partSelectedMaterialId = part.MaterialId;
        partRows.Clear();
        showPartForm = true;
        partErrorMessage = null;
    }

    private void CancelPartForm()
    {
        showPartForm = false;
        editingPart = null;
    }

    private async Task SavePartAsync()
    {
        partErrorMessage = null;

        if (!selectedShape.HasValue)
        {
            partErrorMessage = "Please select a shape";
            return;
        }

        if (partSelectedMaterialId == 0)
        {
            partErrorMessage = "Please select a size";
            return;
        }

        if (editingPart != null)
        {
            // Edit mode: single part
            if (newPart.LengthInches <= 0)
            {
                partErrorMessage = "Length must be greater than zero";
                return;
            }
            if (newPart.Quantity < 1)
            {
                partErrorMessage = "Quantity must be at least 1";
                return;
            }

            newPart.MaterialId = partSelectedMaterialId;
            await JobService.UpdatePartAsync(newPart);
        }
        else
        {
            // Add mode: multiple rows
            for (int i = 0; i < partRows.Count; i++)
            {
                var row = partRows[i];
                if (row.LengthInches <= 0)
                {
                    partErrorMessage = $"Row {i + 1}: Length must be greater than zero";
                    return;
                }
                if (row.Quantity < 1)
                {
                    partErrorMessage = $"Row {i + 1}: Quantity must be at least 1";
                    return;
                }
            }

            foreach (var row in partRows)
            {
                var part = new JobPart
                {
                    JobId = Id!.Value,
                    MaterialId = partSelectedMaterialId,
                    LengthInches = row.LengthInches,
                    Quantity = row.Quantity,
                    Name = row.Name ?? string.Empty
                };
                await JobService.AddPartAsync(part);
            }
        }

        job = (await JobService.GetByIdAsync(Id!.Value))!;
        showPartForm = false;
        editingPart = null;
        // Results were cleared by the service
        packResult = null;
        summary = null;
    }

    private async Task DeletePart(JobPart part)
    {
        await JobService.DeletePartAsync(part.Id);
        job = (await JobService.GetByIdAsync(Id!.Value))!;
        packResult = null;
        summary = null;
    }

    // Stock tab
    private RenderFragment RenderStockTab() => __builder =>
    {
        <div class="card">
            <div class="card-header d-flex justify-content-between align-items-center">
                <h5 class="mb-0">Stock for This Job</h5>
                @if (!job.IsLocked)
                {
                    <button class="btn btn-primary" @onclick="ShowAddStockModal">Add Stock</button>
                }
            </div>
            <div class="card-body">
                @if (job.Stock.Count == 0)
                {
                    <div class="text-center py-4 text-muted">
                        <p class="mb-2">No stock configured for this job.</p>
                        <p class="small">Add stock from your inventory or define custom lengths.</p>
                        <p class="small">Stock must be explicitly added here before you can optimize — there is no automatic fallback to inventory.</p>
                    </div>
                }
                else
                {
                    @RenderStockTable()
                }
            </div>
        </div>
    };

    private RenderFragment RenderStockTable() => __builder =>
    {
        <div class="table-responsive">
            <table class="table table-hover mb-0">
                <thead>
                    <tr>
                        <th>Material</th>
                        <th>Length</th>
                        <th>Qty</th>
                        <th>Priority</th>
                        <th>Source</th>
                        <th style="width: 120px;">Actions</th>
                    </tr>
                </thead>
                <tbody>
                    @foreach (var stock in job.Stock.OrderBy(s => s.Material?.Shape).ThenBy(s => s.Material?.Size).ThenBy(s => s.Priority))
                    {
                        <tr>
                            <td>@stock.Material?.DisplayName</td>
                            <td>@ArchUnits.FormatFromInches((double)stock.LengthInches) <span class="text-muted">(@(stock.LengthInches)")</span></td>
                            <td>@(stock.Quantity == -1 ? "Unlimited" : stock.Quantity.ToString())</td>
                            <td>@stock.Priority</td>
                            <td>
                                @if (stock.IsCustomLength)
                                {
                                    <span class="badge bg-info">Custom</span>
                                }
                                else
                                {
                                    <span class="badge bg-secondary">Inventory</span>
                                }
                            </td>
                            <td>
                                @if (!job.IsLocked)
                                {
                                    <div class="table-actions">
                                        <button class="btn btn-sm btn-outline-primary" @onclick="() => EditStock(stock)" title="Edit"><i class="bi bi-pencil"></i></button>
                                        <button class="btn btn-sm btn-outline-danger" @onclick="() => DeleteStock(stock)" title="Delete"><i class="bi bi-trash"></i></button>
                                    </div>
                                }
                            </td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>
    };

    // Results tab
    private RenderFragment RenderResultsTab() => __builder =>
    {
        @if (!CanOptimize)
        {
            <div class="alert alert-warning">
                <h5 class="mb-2">Cannot Optimize</h5>
                <ul class="mb-0">
                    @if (job.Parts.Count == 0)
                    {
                        <li>No parts defined. Switch to the <button class="btn btn-link p-0" @onclick="() => SetTab(Tab.Parts)">Parts tab</button> to add parts.</li>
                    }
                    @if (job.CuttingToolId == null)
                    {
                        <li>No cutting tool selected. Switch to the <button class="btn btn-link p-0" @onclick="() => SetTab(Tab.Details)">Details tab</button> to select a cutting tool.</li>
                    }
                </ul>
            </div>
        }
        else
        {
            <div class="mb-3">
                <button class="btn btn-success" @onclick="RunOptimization" disabled="@(optimizing || job.IsLocked)">
                    @if (optimizing)
                    {
                        <span class="spinner-border spinner-border-sm me-1"></span>
                        <text>Optimizing...</text>
                    }
                    else if (packResult != null)
                    {
                        <i class="bi bi-arrow-clockwise me-1"></i>
                        <text>Re-Optimize</text>
                    }
                    else
                    {
                        <i class="bi bi-scissors me-1"></i>
                        <text>Optimize</text>
                    }
                </button>
                @if (packResult != null)
                {
                    <button class="btn btn-outline-secondary ms-2" @onclick="PrintReport">
                        <i class="bi bi-printer me-1"></i> Print Report
                    </button>
                    <button class="btn btn-outline-secondary ms-2" @onclick="() => showLengthsInInches = !showLengthsInInches"
                            aria-pressed="@showLengthsInInches">
                        @(showLengthsInInches ? "Show feet + inches" : "Show all inches")
                    </button>
                    @if (!job.IsLocked)
                    {
                        <button class="btn btn-warning ms-2" @onclick="LockJob" disabled="@lockingJob">
                            @if (lockingJob)
                            {
                                <span class="spinner-border spinner-border-sm me-1"></span>
                            }
                            <i class="bi bi-lock me-1"></i>Lock Job
                        </button>
                    }
                }
                @if (job.OptimizedAt.HasValue)
                {
                    <span class="text-muted ms-3">
                        Last optimized: @job.OptimizedAt.Value.ToLocalTime().ToString("g")
                    </span>
                }
            </div>

            @if (packResult != null && summary != null)
            {
                @if (summary.TotalItemsNotPlaced > 0)
                {
                    <div class="alert alert-warning">
                        <h5>Items Not Placed</h5>
                        <p class="mb-0">Some items could not be placed. This usually means no stock lengths are configured for the material, or parts are too long.</p>
                    </div>
                }

                <!-- Overall Summary Cards -->
                <div class="row mb-4 print-summary">
                    <div class="col-md-3 col-6 mb-3">
                        <div class="card text-center">
                            <div class="card-body">
                                <h2 class="card-title mb-0">@(summary.TotalInStockBins + summary.TotalToBePurchasedBins)</h2>
                                <p class="card-text text-muted">Total Stock Bars</p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-3 col-6 mb-3">
                        <div class="card text-center">
                            <div class="card-body">
                                <h2 class="card-title mb-0">@summary.TotalPieces</h2>
                                <p class="card-text text-muted">Total Pieces</p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-3 col-6 mb-3">
                        <div class="card text-center">
                            <div class="card-body">
                                <h2 class="card-title mb-0">@FormatResultLength(summary.TotalWaste)</h2>
                                <p class="card-text text-muted">Total Waste</p>
                            </div>
                        </div>
                    </div>
                    <div class="col-md-3 col-6 mb-3">
                        <div class="card text-center">
                            <div class="card-body">
                                <h2 class="card-title mb-0">@summary.Efficiency.ToString("F1")%</h2>
                                <p class="card-text text-muted">Efficiency</p>
                            </div>
                        </div>
                    </div>
                </div>

                @if (job.CuttingTool != null)
                {
                    <div class="print-cut-method">
                        <strong>Cut Method:</strong> @job.CuttingTool.Name
                        <span class="ms-2">Kerf: @FormatResultLength((double)job.CuttingTool.KerfInches)</span>
                    </div>
                }

                <!-- Material List: required stock lengths not covered by job stock -->
                <div class="card mb-4 print-material-list">
                    <div class="card-header d-flex justify-content-between align-items-center">
                        <h5 class="mb-0"><i class="bi bi-box-seam me-2"></i>Material List</h5>
                        @if (job.IsLocked)
                        {
                            <span class="badge bg-success print-screen-only"><i class="bi bi-lock-fill me-1"></i>Job Locked</span>
                        }
                    </div>
                    <div class="card-body">
                        @if (summary.TotalToBePurchasedBins == 0)
                        {
                            <p class="text-muted mb-0">No additional material lengths are required beyond the stock configured for this job.</p>
                        }
                        else
                        {
                            <div class="table-responsive">
                                <table class="table table-sm mb-0">
                                    <thead>
                                        <tr>
                                            <th>Material</th>
                                            <th>Length</th>
                                            <th class="text-end">Qty</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        @foreach (var materialResult in packResult.MaterialResults.Where(mr => mr.ToBePurchasedBins.Count > 0))
                                        {
                                            @foreach (var group in materialResult.ToBePurchasedBins.GroupBy(b => b.Length).OrderByDescending(g => g.Key))
                                            {
                                                <tr>
                                                    <td>@materialResult.Material.DisplayName</td>
                                                    <td>@FormatResultLength(group.Key)</td>
                                                    <td class="text-end">@group.Count()</td>
                                                </tr>
                                            }
                                        }
                                    </tbody>
                                    <tfoot>
                                        <tr class="fw-bold">
                                            <td colspan="2">Total Required</td>
                                            <td class="text-end">@summary.TotalToBePurchasedBins bars</td>
                                        </tr>
                                    </tfoot>
                                </table>
                            </div>
                        }
                    </div>
                </div>

                <!-- Cut Lists by Material -->
                @foreach (var materialResult in packResult.MaterialResults)
                {
                    var materialSummary = summary.MaterialSummaries.First(s => s.Material.Id == materialResult.Material.Id);
                    var allBins = materialResult.InStockBins
                        .Select(b => new { Bin = b, Source = "Stock" })
                        .Concat(materialResult.ToBePurchasedBins
                            .Select(b => new { Bin = b, Source = "Purchase" }))
                        .ToList();

                    <div class="card mb-4 cutlist-material-card">
                        <div class="card-header cutlist-material-screen-header">
                            <div class="d-flex justify-content-between align-items-center">
                                <h5 class="mb-0">@materialResult.Material.DisplayName</h5>
                                <span class="text-muted">
                                    @(materialSummary.InStockBins + materialSummary.ToBePurchasedBins) bars
                                    &middot; @materialSummary.TotalPieces pieces
                                    &middot; @materialSummary.Efficiency.ToString("F1")% efficiency
                                </span>
                            </div>
                        </div>
                        <div class="card-body">
                            @if (materialResult.PackResult.ItemsNotUsed.Count > 0)
                            {
                                <div class="alert alert-danger">
                                    <strong>@materialResult.PackResult.ItemsNotUsed.Count items not placed</strong> —
                                    not enough stock quantity entered for this job, no stock lengths configured, or parts too long.
                                </div>
                            }

                            <div class="table-responsive">
                                <table class="table table-sm table-striped mb-0">
                                    <thead>
                                        <tr class="cutlist-material-print-header">
                                            <th colspan="4">
                                                <span class="cutlist-material-name">@materialResult.Material.DisplayName</span>
                                                <span class="cutlist-material-stats">
                                                    @(materialSummary.InStockBins + materialSummary.ToBePurchasedBins) bars
                                                    &middot; @materialSummary.TotalPieces pieces
                                                    &middot; @materialSummary.Efficiency.ToString("F1")% efficiency
                                                </span>
                                            </th>
                                        </tr>
                                        <tr>
                                            <th style="width: 50px;">#</th>
                                            <th style="white-space: nowrap;">Stock Length</th>
                                            <th>Cuts</th>
                                            <th style="width: 120px; white-space: nowrap;">Waste</th>
                                        </tr>
                                    </thead>
                                    <tbody>
                                        @{ var binNum = 1; }
                                        @foreach (var entry in allBins)
                                        {
                                            <tr>
                                                <td>@binNum</td>
                                                <td style="white-space: nowrap;">@FormatResultLength(entry.Bin.Length)</td>
                                                <td>
                                                    @foreach (var item in entry.Bin.Items)
                                                    {
                                                        <span class="badge me-1 mb-1 fs-6 cut-part-badge">
                                                            @if (!string.IsNullOrWhiteSpace(item.Name))
                                                            {
                                                                <span class="cut-part-badge-name">@item.Name</span>
                                                                <span class="cut-part-badge-divider" aria-hidden="true"></span>
                                                            }
                                                            <span class="cut-part-badge-length">@FormatResultLength(item.Length)</span>
                                                        </span>
                                                    }
                                                </td>
                                                <td style="white-space: nowrap;">@FormatResultLength(entry.Bin.RemainingLength)</td>
                                            </tr>
                                            binNum++;
                                        }
                                    </tbody>
                                </table>
                            </div>
                        </div>
                    </div>
                }
            }
            else if (!optimizing)
            {
                <div class="text-center py-5 text-muted">
                    <i class="bi bi-scissors display-4"></i>
                    <p class="mt-3">Click <strong>Optimize</strong> to calculate the most efficient cut list.</p>
                </div>
            }
        }
    };


    private async Task RunOptimization()
    {
        optimizing = true;
        try
        {
            var kerf = job.CuttingTool?.KerfInches ?? 0.125m;
            packResult = await PackingService.PackAsync(job.Parts, kerf, job.Stock.Count > 0 ? job.Stock : null);
            summary = PackingService.GetSummary(packResult);

            // Save to database
            var json = PackingService.SerializeResult(packResult);
            await JobService.SaveOptimizationResultAsync(Id!.Value, json, DateTime.UtcNow);

            // Refresh job to get updated OptimizedAt
            job = (await JobService.GetByIdAsync(Id!.Value))!;
        }
        finally
        {
            optimizing = false;
        }
    }

    private async Task LockJob()
    {
        lockingJob = true;
        try
        {
            await JobService.LockAsync(Id!.Value);
            job = (await JobService.GetByIdAsync(Id!.Value))!;
        }
        finally
        {
            lockingJob = false;
        }
    }

    private async Task PrintReport()
    {
        var filename = $"CutList - {job.Name} - {DateTime.Now:yyyy-MM-dd}";
        await JS.InvokeVoidAsync("printWithTitle", filename);
    }

    private async Task ShowAddStockModal()
    {
        editingStock = null;
        newStock = new JobStock { JobId = Id!.Value, Quantity = -1, Priority = 10 };
        stockSelectedShape = null;
        stockSelectedMaterialId = 0;
        availableStockItems.Clear();
        stockErrorMessage = null;
        importErrorMessage = null;
        importCandidates.Clear();
        stockModalTab = job.Parts.Count > 0 ? StockModalTab.Inventory : StockModalTab.Custom;
        showStockModal = true;

        if (job.Parts.Count > 0)
        {
            await LoadImportCandidatesAsync();
        }
    }

    private void CloseStockModal()
    {
        showStockModal = false;
        editingStock = null;
        newStock = new();
        importCandidates.Clear();
        stockErrorMessage = null;
        importErrorMessage = null;
    }

    private async Task OnStockShapeChanged()
    {
        stockSelectedMaterialId = 0;
        newStock.MaterialId = 0;
        newStock.StockItemId = null;
        availableStockItems.Clear();
    }

    private async Task OnStockMaterialChanged()
    {
        newStock.MaterialId = stockSelectedMaterialId;
        newStock.StockItemId = null;
        await LoadAvailableStockItemsAsync(stockSelectedMaterialId);
    }

    private async Task EditStock(JobStock stock)
    {
        editingStock = stock;
        newStock = new JobStock
        {
            Id = stock.Id,
            JobId = stock.JobId,
            MaterialId = stock.MaterialId,
            StockItemId = stock.StockItemId,
            LengthInches = stock.LengthInches,
            Quantity = stock.Quantity,
            IsCustomLength = stock.IsCustomLength,
            Priority = stock.Priority,
            SortOrder = stock.SortOrder
        };
        stockSelectedShape = stock.Material?.Shape;
        stockSelectedMaterialId = stock.MaterialId;
        stockErrorMessage = null;
        stockModalTab = stock.IsCustomLength ? StockModalTab.Custom : StockModalTab.Inventory;
        showStockModal = true;

        if (!stock.IsCustomLength)
        {
            // Load the candidate stock lengths without going through OnStockMaterialChanged,
            // which would reset newStock.StockItemId and blank the prefilled selection.
            // Awaited (not fire-and-forget) so Blazor re-renders once the list arrives.
            await LoadAvailableStockItemsAsync(stock.MaterialId);
        }
    }

    private async Task LoadAvailableStockItemsAsync(int materialId)
    {
        availableStockItems = materialId > 0
            ? await JobService.GetAvailableStockForMaterialAsync(materialId)
            : new List<StockItem>();
    }

    private async Task SaveStockFromInventoryAsync()
    {
        stockErrorMessage = null;

        if (!stockSelectedShape.HasValue)
        {
            stockErrorMessage = "Please select a shape";
            return;
        }

        if (stockSelectedMaterialId == 0)
        {
            stockErrorMessage = "Please select a size";
            return;
        }

        if (!newStock.StockItemId.HasValue)
        {
            stockErrorMessage = "Please select a stock length";
            return;
        }

        if (newStock.Quantity < -1 || newStock.Quantity == 0)
        {
            stockErrorMessage = "Quantity must be at least 1 (or -1 for unlimited)";
            return;
        }

        var selectedStock = availableStockItems.FirstOrDefault(s => s.Id == newStock.StockItemId);
        if (selectedStock == null)
        {
            stockErrorMessage = "Selected stock not found";
            return;
        }

        newStock.MaterialId = stockSelectedMaterialId;
        newStock.LengthInches = selectedStock.LengthInches;
        newStock.IsCustomLength = false;

        if (editingStock == null)
        {
            await JobService.AddStockAsync(newStock);
        }
        else
        {
            await JobService.UpdateStockAsync(newStock);
        }

        job = (await JobService.GetByIdAsync(Id!.Value))!;
        showStockModal = false;
        editingStock = null;
        packResult = null;
        summary = null;
    }

    private async Task SaveCustomStockAsync()
    {
        stockErrorMessage = null;

        if (!stockSelectedShape.HasValue)
        {
            stockErrorMessage = "Please select a shape";
            return;
        }

        if (newStock.MaterialId == 0)
        {
            stockErrorMessage = "Please select a size";
            return;
        }

        if (newStock.LengthInches <= 0)
        {
            stockErrorMessage = "Length must be greater than zero";
            return;
        }

        if (newStock.Quantity < -1 || newStock.Quantity == 0)
        {
            stockErrorMessage = "Quantity must be at least 1 (or -1 for unlimited)";
            return;
        }

        newStock.StockItemId = null;
        newStock.IsCustomLength = true;

        if (editingStock == null)
        {
            await JobService.AddStockAsync(newStock);
        }
        else
        {
            await JobService.UpdateStockAsync(newStock);
        }

        job = (await JobService.GetByIdAsync(Id!.Value))!;
        showStockModal = false;
        editingStock = null;
        packResult = null;
        summary = null;
    }

    private async Task DeleteStock(JobStock stock)
    {
        await JobService.DeleteStockAsync(stock.Id);
        job = (await JobService.GetByIdAsync(Id!.Value))!;
        packResult = null;
        summary = null;
    }

    // Loads inventory stock candidates for the modal's "From Inventory" tab
    private async Task LoadImportCandidatesAsync()
    {
        importErrorMessage = null;
        importCandidates.Clear();
        loadingImport = true;

        try
        {
            var materialIds = job.Parts.Select(p => p.MaterialId).Distinct().ToList();
            var existingStockItemIds = job.Stock
                .Where(s => s.StockItemId.HasValue)
                .Select(s => s.StockItemId!.Value)
                .ToHashSet();

            foreach (var materialId in materialIds)
            {
                var stockItems = await JobService.GetAvailableStockForMaterialAsync(materialId);
                foreach (var item in stockItems.Where(s => !existingStockItemIds.Contains(s.Id)))
                {
                    importCandidates.Add(new ImportStockCandidate
                    {
                        StockItem = item,
                        Selected = true,
                        Quantity = -1,
                        Priority = 10
                    });
                }
            }
        }
        catch (Exception ex)
        {
            importErrorMessage = $"Error loading stock: {ex.Message}";
        }
        finally
        {
            loadingImport = false;
        }
    }

    private void ToggleAllImportCandidates(bool selected)
    {
        foreach (var c in importCandidates)
            c.Selected = selected;
    }

    private async Task ImportSelectedStockAsync()
    {
        importErrorMessage = null;
        var selected = importCandidates.Where(c => c.Selected).ToList();
        if (selected.Count == 0)
        {
            importErrorMessage = "No items selected";
            return;
        }

        try
        {
            foreach (var candidate in selected)
            {
                var jobStock = new JobStock
                {
                    JobId = Id!.Value,
                    MaterialId = candidate.StockItem.MaterialId,
                    StockItemId = candidate.StockItem.Id,
                    LengthInches = candidate.StockItem.LengthInches,
                    Quantity = candidate.Quantity,
                    Priority = candidate.Priority,
                    IsCustomLength = false
                };
                await JobService.AddStockAsync(jobStock);
            }

            job = (await JobService.GetByIdAsync(Id!.Value))!;
            showStockModal = false;
            importCandidates.Clear();
            packResult = null;
            summary = null;
        }
        catch (Exception ex)
        {
            importErrorMessage = $"Error importing stock: {ex.Message}";
        }
    }

    private class PartRow
    {
        public decimal LengthInches { get; set; }
        public int Quantity { get; set; } = 1;
        public string? Name { get; set; }
    }

    private class ImportStockCandidate
    {
        public StockItem StockItem { get; set; } = null!;
        public bool Selected { get; set; } = true;
        public int Quantity { get; set; } = -1;
        public int Priority { get; set; } = 10;
    }
}