@page
@model MoneyMap.Pages.UploadModel
@{
    ViewData["Title"] = "Upload Transactions";
    ViewData["FullWidth"] = Model.PreviewTransactions.Any();
}

<h2>Upload Transactions</h2>

@if (Model.PreviewTransactions.Any())
{
    <div class="alert alert-info">
        <strong>Preview:</strong> Review the transactions below before importing. Duplicates are marked in gray and will be skipped.
    </div>

    <form method="post" asp-page-handler="Confirm" id="confirmForm" onsubmit="return prepareFormData()">
        <input type="hidden" name="selectedIndices" id="selectedIndices" />
        <input type="hidden" name="paymentData" id="paymentData" />

        <!-- Account Selection for All Transactions -->
        <div class="card shadow-sm mb-3">
            <div class="card-body">
                <div class="row align-items-center">
                    <div class="col-md-3">
                        <label class="form-label fw-bold mb-0">Account for all transactions:</label>
                    </div>
                    <div class="col-md-6">
                        <select id="globalAccountId" class="form-select" onchange="updateAllTransactionAccounts()">
                            <option value="">-- choose account --</option>
                            @foreach (var a in Model.Accounts)
                            {
                                var isSelected = Model.PreviewTransactions.FirstOrDefault()?.Transaction.AccountId == a.Id;
                                <option value="@a.Id" selected="@isSelected">@a.DisplayLabel</option>
                            }
                        </select>
                    </div>
                    <div class="col-md-3">
                        <small class="text-muted">All transactions in this file belong to this account</small>
                    </div>
                </div>
            </div>
        </div>

        <div class="card shadow-sm mb-3">
            <div class="card-header d-flex justify-content-between align-items-center">
                <strong>Transaction Preview (<span id="selectedCount">@Model.PreviewTransactions.Count(p => !p.IsDuplicate)</span> selected, @Model.PreviewTransactions.Count(p => p.IsDuplicate) duplicates)</strong>
                @if (Model.PreviewTransactions.Count > 100)
                {
                    <div class="d-flex align-items-center gap-2">
                        <small class="text-muted">Showing <span id="pageStart">1</span>-<span id="pageEnd">100</span> of @Model.PreviewTransactions.Count</small>
                        <button type="button" class="btn btn-sm btn-outline-secondary" onclick="previousPage()">Previous</button>
                        <button type="button" class="btn btn-sm btn-outline-secondary" onclick="nextPage()">Next</button>
                    </div>
                }
            </div>
            <div class="card-body p-0">
                <div class="table-responsive" style="max-height: 500px; overflow-y: auto;">
                    <table class="table table-sm table-hover mb-0">
                        <thead class="sticky-top bg-white">
                            <tr>
                                <th style="width: 50px;">
                                    <input type="checkbox" id="selectAll" class="form-check-input" onchange="toggleAllCheckboxes()" checked />
                                </th>
                                <th style="width: 100px;">Date</th>
                                <th>Merchant</th>
                                <th>Memo</th>
                                <th style="width: 100px;" class="text-end">Amount</th>
                                <th style="width: 150px;">Category</th>
                                <th style="width: 180px;">Card Used (optional)</th>
                                <th style="width: 80px;">Status</th>
                            </tr>
                        </thead>
                        <tbody id="transactionTableBody">
                            @for (int i = 0; i < Model.PreviewTransactions.Count; i++)
                            {
                                var preview = Model.PreviewTransactions[i];
                                var displayStyle = i >= 100 ? "display: none;" : "";
                                <tr class="@(preview.IsDuplicate ? "table-secondary text-muted" : "") transaction-row" data-index="@i" style="@displayStyle">
                                    <td>
                                        <input type="checkbox" data-index="@i"
                                               class="form-check-input transaction-checkbox"
                                               checked="@(!preview.IsDuplicate)"
                                               onchange="updateSelectedCount()" />
                                    </td>
                                    <td>@preview.Transaction.Date.ToString("MM/dd/yy")</td>
                                    <td>@preview.Transaction.Name</td>
                                    <td class="text-truncate" style="max-width: 200px;" title="@preview.Transaction.Memo">
                                        @preview.Transaction.Memo
                                    </td>
                                    <td class="text-end @(preview.Transaction.Amount >= 0 ? "text-success" : "text-danger")">
                                        @preview.Transaction.Amount.ToString("C")
                                    </td>
                                    <td>
                                        <input type="text"
                                               data-index="@i"
                                               class="form-control form-control-sm category-input"
                                               value="@preview.Transaction.Category"
                                               placeholder="(uncategorized)"
                                               list="categoryList" />
                                        @if (!string.IsNullOrWhiteSpace(preview.SuggestedCategory))
                                        {
                                            <small class="badge bg-info" title="Auto-suggested">Auto</small>
                                        }
                                    </td>
                                    <td>
                                        <select data-index="@i" class="form-select form-select-sm card-select">
                                            <option value="">-- none / direct debit --</option>
                                            @foreach (var c in Model.Cards)
                                            {
                                                <option value="@c.Id" selected="@(preview.Transaction.CardId == c.Id)">@c.DisplayLabel</option>
                                            }
                                        </select>
                                    </td>
                                    <td>
                                        @if (preview.IsDuplicate)
                                        {
                                            <span class="badge bg-warning">Duplicate</span>
                                        }
                                        else
                                        {
                                            <span class="badge bg-success">New</span>
                                        }
                                    </td>
                                </tr>
                            }
                        </tbody>
                    </table>
                </div>
            </div>
        </div>

        <!-- Category autocomplete datalist -->
        <datalist id="categoryList">
            @foreach (var cat in Model.PreviewTransactions.Select(p => p.Transaction.Category).Where(c => !string.IsNullOrWhiteSpace(c)).Distinct().OrderBy(c => c))
            {
                <option value="@cat">@cat</option>
            }
        </datalist>

        <div class="d-flex gap-2">
            <button type="submit" class="btn btn-success btn-lg">
                <strong>Confirm Import</strong> (<span id="selectedCountButton">@Model.PreviewTransactions.Count(p => !p.IsDuplicate)</span> transactions)
            </button>
            <a asp-page="/Upload" class="btn btn-secondary btn-lg">Cancel</a>
        </div>
    </form>
}
else if (Model.Result != null)
{
    <div class="alert alert-success">
        <h4>Import Complete!</h4>
        <p>
            <strong>@Model.Result.Total</strong> total rows processed<br />
            <strong class="text-success">@Model.Result.Inserted</strong> new transactions imported<br />
            <strong class="text-warning">@Model.Result.Skipped</strong> duplicates skipped
        </p>
        <a asp-page="/Transactions" class="btn btn-primary">View Transactions</a>
        <a asp-page="/Upload" class="btn btn-outline-secondary">Upload More</a>
    </div>
}
else
{
<form method="post" enctype="multipart/form-data" class="vstack gap-3">
    @Html.AntiForgeryToken()

    <div>
        <label class="form-label">CSV file</label>
        <input asp-for="Csv" type="file" class="form-control" accept=".csv" />
        <span asp-validation-for="Csv" class="text-danger"></span>
        
    </div>

    <fieldset class="border rounded p-3">
        <legend class="float-none w-auto fs-6">Payment Method Assignment</legend>

        <div class="mb-3">
            <label class="form-label fw-bold">Mode</label>
            <div class="form-check">
                <input class="form-check-input" type="radio" asp-for="PaymentMode" value="Auto" id="modeAuto" onchange="togglePaymentSelection()" checked />
                <label class="form-check-label" for="modeAuto">
                    Automatically determine from CSV
                </label>
                <div class="form-text small">Extracts card info from memo or filename</div>
            </div>
            <div class="form-check">
                <input class="form-check-input" type="radio" asp-for="PaymentMode" value="Card" id="modeCard" onchange="togglePaymentSelection()" />
                <label class="form-check-label" for="modeCard">
                    Assign all to a specific card
                </label>
            </div>
            <div class="form-check">
                <input class="form-check-input" type="radio" asp-for="PaymentMode" value="Account" id="modeAccount" onchange="togglePaymentSelection()" />
                <label class="form-check-label" for="modeAccount">
                    Assign all to a bank account
                </label>
                <div class="form-text small">For checking/savings account transactions</div>
            </div>
        </div>

        <div id="cardSelectRow" class="mt-3" style="display: none;">
            <label class="form-label">Select Card</label>
            <select asp-for="SelectedCardId" class="form-select">
                <option value="">-- choose card --</option>
                @foreach (var c in Model.Cards)
                {
                    <option value="@c.Id">@c.DisplayLabel</option>
                }
            </select>
            <span asp-validation-for="SelectedCardId" class="text-danger"></span>
        </div>

        <div id="accountSelectRow" class="mt-3" style="display: none;">
            <label class="form-label">Select Account</label>
            <select asp-for="SelectedAccountId" class="form-select">
                <option value="">-- choose account --</option>
                @foreach (var a in Model.Accounts)
                {
                    <option value="@a.Id">@a.DisplayLabel</option>
                }
            </select>
            <span asp-validation-for="SelectedAccountId" class="text-danger"></span>
            @if (!Model.Accounts.Any())
            {
                <div class="alert alert-warning mt-2 mb-0">
                    No accounts available. <a asp-page="/EditAccount">Create an account first</a>.
                </div>
            }
        </div>
    </fieldset>

    <button type="submit" class="btn btn-primary">Preview Transactions</button>
    <div asp-validation-summary="All" class="text-danger"></div>
</form>
}

@section Scripts {
    <partial name="_ValidationScriptsPartial" />
    <script>
        let currentPage = 0;
        const pageSize = 100;
        const totalRows = @Model.PreviewTransactions.Count;

        function togglePaymentSelection() {
            const mode = document.querySelector('input[name="PaymentMode"]:checked').value;
            const cardRow = document.getElementById('cardSelectRow');
            const accountRow = document.getElementById('accountSelectRow');

            cardRow.style.display = mode === 'Card' ? 'block' : 'none';
            accountRow.style.display = mode === 'Account' ? 'block' : 'none';
        }

        function toggleAllCheckboxes() {
            const selectAll = document.getElementById('selectAll');
            const checkboxes = document.querySelectorAll('.transaction-checkbox');
            checkboxes.forEach(cb => cb.checked = selectAll.checked);
            updateSelectedCount();
        }

        function updateSelectedCount() {
            const checkboxes = document.querySelectorAll('.transaction-checkbox:checked');
            const count = checkboxes.length;
            const selectedCountEl = document.getElementById('selectedCount');
            const selectedCountButtonEl = document.getElementById('selectedCountButton');
            if (selectedCountEl) selectedCountEl.textContent = count;
            if (selectedCountButtonEl) selectedCountButtonEl.textContent = count;
        }

        function updateAllTransactionAccounts() {
            // Called when the global account dropdown changes
            // No action needed - we'll read the global account on form submit
        }

        function showPage(pageNum) {
            const rows = document.querySelectorAll('.transaction-row');
            const start = pageNum * pageSize;
            const end = start + pageSize;

            rows.forEach((row, index) => {
                row.style.display = (index >= start && index < end) ? '' : 'none';
            });

            // Update pagination display
            const pageStartEl = document.getElementById('pageStart');
            const pageEndEl = document.getElementById('pageEnd');
            if (pageStartEl && pageEndEl) {
                pageStartEl.textContent = start + 1;
                pageEndEl.textContent = Math.min(end, totalRows);
            }

            currentPage = pageNum;
        }

        function nextPage() {
            const maxPage = Math.ceil(totalRows / pageSize) - 1;
            if (currentPage < maxPage) {
                showPage(currentPage + 1);
            }
        }

        function previousPage() {
            if (currentPage > 0) {
                showPage(currentPage - 1);
            }
        }

        function prepareFormData() {
            // Collect selected indices
            const selectedIndices = [];
            document.querySelectorAll('.transaction-checkbox:checked').forEach(cb => {
                selectedIndices.push(cb.getAttribute('data-index'));
            });
            document.getElementById('selectedIndices').value = selectedIndices.join(',');

            // Get the global account ID
            const globalAccountId = document.getElementById('globalAccountId')?.value;
            if (!globalAccountId) {
                alert('Please select an account for all transactions');
                return false;
            }

            // Collect payment data (account + optional card + category per transaction)
            const paymentData = {};
            document.querySelectorAll('.card-select').forEach((select) => {
                const index = select.getAttribute('data-index');
                const cardId = select.value ? parseInt(select.value) : null;

                // Get category for this transaction
                const categoryInput = document.querySelector(`.category-input[data-index="${index}"]`);
                const category = categoryInput ? categoryInput.value.trim() : '';

                paymentData[index] = {
                    AccountId: parseInt(globalAccountId),
                    CardId: cardId,
                    Category: category
                };
            });
            document.getElementById('paymentData').value = JSON.stringify(paymentData);

            return true; // Allow form submission
        }

        // Initialize on page load
        document.addEventListener('DOMContentLoaded', function() {
            togglePaymentSelection();
            if (totalRows > pageSize) {
                showPage(0);
            }
        });
    </script>
}