@page "/jobs/new"
@page "/jobs/{Id:int}"
@inject JobService JobService
@inject MaterialService MaterialService
@inject StockItemService StockItemService
@inject NavigationManager Navigation
@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>@(IsNew ? "New Job" : job.DisplayName)</h1>
    @if (!IsNew)
    {
        <a href="jobs/@Id/results" class="btn btn-success">Run Optimization</a>
    }
</div>

@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>
    </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()
        }
    </div>
}

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

    [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 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;

    // Stock form
    private bool showStockForm;
    private bool showCustomStockForm;
    private JobStock newStock = new();
    private JobStock? editingStock;
    private string? stockErrorMessage;
    private MaterialShape? stockSelectedShape;
    private int stockSelectedMaterialId;
    private List<StockItem> availableStockItems = new();

    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.Size);

    private bool IsNew => !Id.HasValue;

    protected override async Task OnInitializedAsync()
    {
        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;
        }
        else
        {
            // Set default cutting tool for new jobs
            var defaultTool = await JobService.GetDefaultCuttingToolAsync();
            if (defaultTool != null)
            {
                job.CuttingToolId = defaultTool.Id;
            }
        }

        loading = false;
    }

    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">
                    @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>
                </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>
                <button class="btn btn-primary" @onclick="ShowAddPartForm">Add Part</button>
            </div>
            <div class="card-body">
                @if (showPartForm)
                {
                    <div class="border rounded p-3 mb-3 bg-light">
                        <h6>@(editingPart == null ? "Add Part" : "Edit Part")</h6>
                        <div class="row g-3">
                            <div class="col-md-2">
                                <label class="form-label">Shape</label>
                                <select class="form-select" @bind="selectedShape" @bind:after="OnShapeChanged">
                                    <option value="">-- Select --</option>
                                    @foreach (var shape in DistinctShapes)
                                    {
                                        <option value="@shape">@shape.GetDisplayName()</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-2">
                                <label class="form-label">Size</label>
                                <select class="form-select" @bind="newPart.MaterialId" disabled="@(!selectedShape.HasValue)">
                                    <option value="0">-- Select --</option>
                                    @foreach (var material in FilteredMaterials)
                                    {
                                        <option value="@material.Id">@material.Size</option>
                                    }
                                </select>
                            </div>
                            <div class="col-md-3">
                                <label class="form-label">Length</label>
                                <LengthInput @bind-Value="newPart.LengthInches" />
                            </div>
                            <div class="col-md-2">
                                <label class="form-label">Qty</label>
                                <input type="number" class="form-control" @bind="newPart.Quantity" min="1" />
                            </div>
                            <div class="col-md-3">
                                <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>
                        @if (!string.IsNullOrEmpty(partErrorMessage))
                        {
                            <div class="alert alert-danger mt-3 mb-0">@partErrorMessage</div>
                        }
                        <div class="mt-3 d-flex gap-2">
                            <button class="btn btn-primary" @onclick="SavePartAsync">@(editingPart == null ? "Add Part" : "Save Changes")</button>
                            <button class="btn btn-outline-secondary" @onclick="CancelPartForm">Cancel</button>
                        </div>
                    </div>
                }

                @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)</td>
                                        <td>@part.Quantity</td>
                                        <td>@(string.IsNullOrWhiteSpace(part.Name) ? "-" : part.Name)</td>
                                        <td>
                                            <button class="btn btn-sm btn-outline-primary me-1" @onclick="() => EditPart(part)">Edit</button>
                                            <button class="btn btn-sm btn-outline-danger" @onclick="() => DeletePart(part)">Delete</button>
                                        </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);
            }
        }
        finally
        {
            savingJob = false;
        }
    }

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

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

    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;
        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 (newPart.MaterialId == 0)
        {
            partErrorMessage = "Please select a size";
            return;
        }

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

        if (newPart.Quantity < 1)
        {
            partErrorMessage = "Quantity must be at least 1";
            return;
        }

        if (editingPart == null)
        {
            await JobService.AddPartAsync(newPart);
        }
        else
        {
            await JobService.UpdatePartAsync(newPart);
        }

        job = (await JobService.GetByIdAsync(Id!.Value))!;
        showPartForm = false;
        editingPart = null;
    }

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

    // 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>
                <div class="btn-group">
                    <button class="btn btn-primary" @onclick="ShowAddStockFromInventory">Add from Inventory</button>
                    <button class="btn btn-outline-primary" @onclick="ShowAddCustomStock">Add Custom Length</button>
                </div>
            </div>
            <div class="card-body">
                @if (showStockForm)
                {
                    @RenderStockFromInventoryForm()
                }
                else if (showCustomStockForm)
                {
                    @RenderCustomStockForm()
                }

                @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">If no stock is selected, the optimizer will use all available stock for the materials in your parts list.</p>
                    </div>
                }
                else
                {
                    @RenderStockTable()
                }
            </div>
        </div>
    };

    private RenderFragment RenderStockFromInventoryForm() => __builder =>
    {
        <div class="border rounded p-3 mb-3 bg-light">
            <h6>@(editingStock == null ? "Add Stock from Inventory" : "Edit Stock Selection")</h6>
            <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.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) (@stock.QuantityOnHand available)</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" />
                </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 class="mt-3 d-flex gap-2">
                <button class="btn btn-primary" @onclick="SaveStockFromInventoryAsync">
                    @(editingStock == null ? "Add Stock" : "Save Changes")
                </button>
                <button class="btn btn-outline-secondary" @onclick="CancelStockForm">Cancel</button>
            </div>
        </div>
    };

    private RenderFragment RenderCustomStockForm() => __builder =>
    {
        <div class="border rounded p-3 mb-3 bg-light">
            <h6>@(editingStock == null ? "Add Custom Stock Length" : "Edit Custom Stock")</h6>
            <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.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 class="mt-3 d-flex gap-2">
                <button class="btn btn-primary" @onclick="SaveCustomStockAsync">
                    @(editingStock == null ? "Add Stock" : "Save Changes")
                </button>
                <button class="btn btn-outline-secondary" @onclick="CancelStockForm">Cancel</button>
            </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)</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>
                                <button class="btn btn-sm btn-outline-primary me-1" @onclick="() => EditStock(stock)">Edit</button>
                                <button class="btn btn-sm btn-outline-danger" @onclick="() => DeleteStock(stock)">Delete</button>
                            </td>
                        </tr>
                    }
                </tbody>
            </table>
        </div>
    };

    private void ShowAddStockFromInventory()
    {
        editingStock = null;
        newStock = new JobStock { JobId = Id!.Value, Quantity = 1, Priority = 10 };
        stockSelectedShape = null;
        stockSelectedMaterialId = 0;
        availableStockItems.Clear();
        showStockForm = true;
        showCustomStockForm = false;
        stockErrorMessage = null;
    }

    private void ShowAddCustomStock()
    {
        editingStock = null;
        newStock = new JobStock { JobId = Id!.Value, Quantity = -1, Priority = 10, IsCustomLength = true };
        stockSelectedShape = null;
        showStockForm = false;
        showCustomStockForm = true;
        stockErrorMessage = null;
    }

    private void CancelStockForm()
    {
        showStockForm = false;
        showCustomStockForm = false;
        editingStock = 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;
        if (stockSelectedMaterialId > 0)
        {
            availableStockItems = await JobService.GetAvailableStockForMaterialAsync(stockSelectedMaterialId);
        }
        else
        {
            availableStockItems.Clear();
        }
    }

    private void 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;

        if (stock.IsCustomLength)
        {
            showStockForm = false;
            showCustomStockForm = true;
        }
        else
        {
            showStockForm = true;
            showCustomStockForm = false;
            _ = OnStockMaterialChanged();
        }
    }

    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)
        {
            stockErrorMessage = "Quantity must be at least 1";
            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))!;
        showStockForm = false;
        editingStock = 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))!;
        showCustomStockForm = false;
        editingStock = null;
    }

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