<?php
session_start();
include_once('../includes/config.php');
if (!isset($_SESSION['uid'])) {
    header('location:../logout.php');
    exit();
}

$startDate = isset($_GET['startDate']) && $_GET['startDate'] ? $_GET['startDate'] : date('Y-m-01');
$endDate = isset($_GET['endDate']) && $_GET['endDate'] ? $_GET['endDate'] : date('Y-m-t');
$supplierCode = isset($_GET['supplierCode']) ? trim($_GET['supplierCode']) : '';
$purchaseType = isset($_GET['purchaseType']) ? trim($_GET['purchaseType']) : '';
$itemCode = isset($_GET['itemCode']) ? trim($_GET['itemCode']) : '';
$categoryId = isset($_GET['categoryId']) ? trim($_GET['categoryId']) : '';

// Get store settings
$storeSettingsQuery = "SELECT * FROM tblstore_settings WHERE StoreCode = 'ST0002' LIMIT 1";
$storeSettingsResult = mysqli_query($con, $storeSettingsQuery);
$storeSettings = null;

if ($storeSettingsResult && mysqli_num_rows($storeSettingsResult) > 0) {
    $storeSettings = mysqli_fetch_assoc($storeSettingsResult);
}
?>
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="utf-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Print | Item-wise Purchase Report</title>
    <style>
        :root {
            --primary-color: #1a1a1a;
            --success-color: #0d6e5f;
            --danger-color: #991b1b;
            --accent-color: #7c2d12;
            --border-color: #cbd5e0;
            --muted-text: #64748b;
            --background-color: #f8fafc;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        body {
            font-family: 'Arial', 'Helvetica Neue', sans-serif;
            font-size: 10px;
            color: #1a1a1a;
            line-height: 1.3;
            background: #e2e8f0;
        }

        .print-container {
            max-width: 297mm;
            margin: 10px auto;
            padding: 15px;
            background: white;
            box-shadow: 0 2px 8px rgba(0,0,0,0.1);
        }

        .print-controls {
            display: flex;
            justify-content: flex-end;
            gap: 6px;
            margin-bottom: 10px;
        }

        .print-controls button {
            padding: 5px 10px;
            border: 1px solid var(--border-color);
            background: white;
            color: var(--accent-color);
            border-radius: 3px;
            font-size: 11px;
            cursor: pointer;
            transition: all 0.2s;
        }

        .print-controls button:hover {
            background: var(--background-color);
        }

        .print-controls button.print {
            background: var(--accent-color);
            color: white;
            border-color: var(--accent-color);
        }

        .print-controls button.print:hover {
            background: var(--primary-color);
        }

        .print-header {
            border-bottom: 2px solid var(--accent-color);
            padding-bottom: 8px;
            margin-bottom: 12px;
        }

        .header-layout {
            display: flex;
            justify-content: space-between;
            align-items: flex-start;
        }

        .company-section {
            flex: 1;
            display: flex;
            align-items: flex-start;
            gap: 12px;
        }

        .logo-container {
            flex-shrink: 0;
        }

        .logo-container img {
            width: 60px;
            height: 60px;
            object-fit: contain;
        }

        .company-info {
            flex: 1;
        }

        .company-name {
            font-size: 16px;
            font-weight: 700;
            letter-spacing: 0.5px;
            color: var(--primary-color);
            text-transform: uppercase;
        }

        .company-details {
            font-size: 9px;
            color: var(--muted-text);
            margin-top: 2px;
            line-height: 1.5;
        }

        .report-info {
            text-align: right;
            flex: 0 0 auto;
        }

        .report-title {
            font-size: 13px;
            font-weight: 700;
            color: var(--accent-color);
            margin-bottom: 4px;
            text-transform: uppercase;
            letter-spacing: 0.3px;
        }

        .report-meta {
            font-size: 9px;
            color: var(--muted-text);
            line-height: 1.4;
        }

        .report-meta strong {
            color: var(--accent-color);
            font-weight: 600;
        }

        .summary-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px;
            margin-bottom: 10px;
        }

        .summary-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 8px;
            -webkit-print-color-adjust: exact;
            print-color-adjust: exact;
        }

        .summary-card h3 {
            font-size: 8px;
            text-transform: uppercase;
            color: var(--muted-text);
            letter-spacing: 0.3px;
            margin-bottom: 4px;
            font-weight: 600;
        }

        .summary-card .amount {
            font-size: 14px;
            font-weight: 700;
            color: var(--primary-color);
        }

        .summary-card.highlight {
            background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
            border-color: #fbbf24;
        }

        .summary-card.highlight .amount {
            color: #92400e;
        }

        .summary-card.success .amount {
            color: var(--success-color);
        }

        .summary-card.danger .amount {
            color: var(--danger-color);
        }

        .summary-card.warning .amount {
            color: #d97706;
        }

        .transaction-info {
            font-size: 9px;
            color: var(--muted-text);
            margin-bottom: 6px;
            padding: 4px 0;
            border-bottom: 1px solid var(--border-color);
        }

        .table-wrapper {
            page-break-inside: auto;
        }

        table {
            width: 100%;
            border-collapse: collapse;
            background: white;
            font-size: 9px;
            border: 1px solid var(--primary-color);
        }

        thead {
            -webkit-print-color-adjust: exact;
            print-color-adjust: exact;
        }

        thead th {
            padding: 5px 4px;
            text-align: left;
            font-size: 8px;
            font-weight: 700;
            letter-spacing: 0.3px;
            text-transform: uppercase;
            background: var(--accent-color);
            color: white;
            border-right: 1px solid rgba(255,255,255,0.1);
        }

        thead th:last-child {
            border-right: none;
        }

        tbody td {
            padding: 4px;
            border-bottom: 1px solid #e5e7eb;
            vertical-align: top;
        }

        tbody tr:nth-child(even) {
            background: #f9fafb;
        }

        tbody tr {
            page-break-inside: avoid;
        }

        .totals-section {
            page-break-inside: avoid;
            margin-top: 0;
        }

        tfoot {
            -webkit-print-color-adjust: exact;
            print-color-adjust: exact;
        }

        tfoot td {
            padding: 6px 4px;
            font-weight: 700;
            background: #e5e7eb;
            border-top: 2px solid var(--accent-color);
            font-size: 10px;
        }

        tfoot tr:last-child td {
            background: var(--accent-color);
            color: white;
            font-size: 11px;
            padding: 8px 4px;
        }

        .text-right {
            text-align: right;
        }

        .text-center {
            text-align: center;
        }

        .amount-positive {
            color: var(--success-color);
            font-weight: 600;
        }

        .amount-negative {
            color: var(--danger-color);
            font-weight: 600;
        }

        .text-success {
            color: var(--success-color);
        }

        .text-danger {
            color: var(--danger-color);
        }

        .text-warning {
            color: #d97706;
        }

        .status-message {
            text-align: center;
            padding: 30px 0;
            color: var(--muted-text);
            font-size: 12px;
        }

        .no-print {
            display: block;
        }

        @media print {
            @page {
                size: A4 landscape;
                margin: 8mm;
            }

            * {
                -webkit-print-color-adjust: exact !important;
                print-color-adjust: exact !important;
                color-adjust: exact !important;
            }

            body {
                background: white;
                font-size: 8px;
            }

            .print-container {
                margin: 0;
                padding: 0;
                box-shadow: none;
                max-width: 100%;
            }

            .no-print {
                display: none !important;
            }

            .print-header {
                margin-bottom: 8px;
                padding-bottom: 6px;
            }

            .summary-grid {
                margin-bottom: 8px;
                gap: 6px;
            }

            table {
                font-size: 7px;
            }

            thead th {
                font-size: 6.5px;
                padding: 3px 2px;
            }

            tbody td {
                padding: 2px 3px;
            }

            tfoot td {
                padding: 4px 3px;
                font-size: 8px;
            }

            tfoot tr:last-child td {
                font-size: 9px;
                padding: 5px 3px;
            }

            .table-wrapper {
                display: block;
            }

            .totals-section {
                page-break-before: auto;
                page-break-inside: avoid;
                page-break-after: avoid;
            }

            tbody tr {
                page-break-inside: avoid;
            }
        }
    </style>
</head>
<body>
    <div class="print-container">
        <div class="print-controls no-print">
            <button type="button" class="print" onclick="window.print()">🖨️ Print Report</button>
            <button type="button" onclick="window.close()">✕ Close</button>
        </div>

        <div id="loadingState" class="status-message">
            ⏳ Loading report data...
        </div>

        <div id="errorState" class="status-message" style="display: none; color: var(--danger-color);">
            ⚠️ Unable to load report. Please close this tab and try again.
        </div>

        <div id="reportContent" style="display: none;">
            <div class="print-header">
                <div class="header-layout">
                    <div class="company-section">
                        <?php if ($storeSettings && !empty($storeSettings['StoreLogo1'])): ?>
                        <div class="logo-container">
                            <img src="../<?php echo htmlspecialchars($storeSettings['StoreLogo1']); ?>" alt="Logo">
                        </div>
                        <?php endif; ?>
                        <div class="company-info">
                            <div class="company-name"><?php echo strtoupper(htmlspecialchars($storeSettings['StoreName'] ?? 'STORE NAME')); ?></div>
                            <div class="company-details">
                                <?php if (!empty($storeSettings['Address'])): ?>
                                <?php echo htmlspecialchars($storeSettings['Address']); ?><br>
                                <?php endif; ?>
                                <?php if (!empty($storeSettings['City'])): ?>
                                <?php echo htmlspecialchars($storeSettings['City']); ?><?php echo !empty($storeSettings['Postcode']) ? ' - ' . htmlspecialchars($storeSettings['Postcode']) : ''; ?><br>
                                <?php endif; ?>
                                <?php if (!empty($storeSettings['Mobile'])): ?>
                                Ph: <?php echo htmlspecialchars($storeSettings['Mobile']); ?>
                                <?php endif; ?>
                                <?php if (!empty($storeSettings['GSTNumber'])): ?>
                                | GSTIN: <?php echo htmlspecialchars($storeSettings['GSTNumber']); ?>
                                <?php endif; ?>
                            </div>
                        </div>
                    </div>
                    <div class="report-info">
                        <div class="report-title">Item-wise Purchase Report</div>
                        <div class="report-meta">
                            <div><strong>Period:</strong> <span id="reportPeriod">-</span></div>
                            <div id="categoryDiv"><strong>Category:</strong> <span id="reportCategory">All Categories</span></div>
                            <div id="itemDiv"><strong>Item:</strong> <span id="reportItem">All Items</span></div>
                            <div id="supplierDiv"><strong>Supplier:</strong> <span id="reportSupplier">All Suppliers</span></div>
                            <div id="purchaseTypeDiv"><strong>Type:</strong> <span id="reportPurchaseType">All Types</span></div>
                            <div><strong>Generated:</strong> <span id="generatedDate">-</span></div>
                        </div>
                    </div>
                </div>
            </div>

            <div class="summary-grid">
                <div class="summary-card">
                    <h3>Total Items</h3>
                    <div class="amount" id="totalItems">0</div>
                </div>
                <div class="summary-card">
                    <h3>Qty Purchased</h3>
                    <div class="amount" id="totalPurchased">0</div>
                </div>
                <div class="summary-card">
                    <h3>Qty Sold</h3>
                    <div class="amount" id="totalSold">0</div>
                </div>
                <div class="summary-card warning">
                    <h3>Stock Remaining</h3>
                    <div class="amount" id="totalRemaining">0</div>
                </div>
                <div class="summary-card danger">
                    <h3>Purchase Value</h3>
                    <div class="amount" id="totalPurchaseValue">₹0.00</div>
                </div>
                <div class="summary-card success">
                    <h3>Sold Value</h3>
                    <div class="amount" id="totalSoldValue">₹0.00</div>
                </div>
                <div class="summary-card highlight">
                    <h3>Stock Value</h3>
                    <div class="amount" id="totalStockValue">₹0.00</div>
                </div>
                <div class="summary-card">
                    <h3>Total Invoices</h3>
                    <div class="amount" id="totalInvoices">0</div>
                </div>
            </div>

            <div class="transaction-info">
                <strong>Item Count:</strong> <span id="itemCount">0</span> items
            </div>

            <div class="table-wrapper">
                <table>
                    <thead>
                        <tr>
                            <th style="width: 3%;">S.No</th>
                            <th style="width: 8%;">Item Code</th>
                            <th style="width: 16%;">Item Name</th>
                            <th style="width: 10%;">Category</th>
                            <th style="width: 8%;">Brand</th>
                            <th style="width: 5%;" class="text-center">Unit</th>
                            <th style="width: 6%;" class="text-right">Qty Purchased</th>
                            <th style="width: 6%;" class="text-right">Qty Sold</th>
                            <th style="width: 6%;" class="text-right">Stock Remaining</th>
                            <th style="width: 7%;" class="text-right">Avg Pur. Rate</th>
                            <th style="width: 8%;" class="text-right">Purchase Value</th>
                            <th style="width: 7%;" class="text-right">Avg Sales Rate</th>
                            <th style="width: 8%;" class="text-right">Sold Value</th>
                            <th style="width: 8%;" class="text-right">Stock Value</th>
                        </tr>
                    </thead>
                    <tbody id="itemsBody">
                        <tr><td colspan="14" class="text-center" style="padding: 20px;">No data</td></tr>
                    </tbody>
                </table>
                <table class="totals-section">
                    <tfoot>
                        <tr>
                            <td colspan="6" class="text-right" style="width: 50%;">PERIOD TOTALS:</td>
                            <td class="text-right" style="width: 6%;" id="totalPurchasedFooter">0</td>
                            <td class="text-right" style="width: 6%;" id="totalSoldFooter">0</td>
                            <td class="text-right" style="width: 6%;" id="totalRemainingFooter">0</td>
                            <td class="text-right" style="width: 7%;">-</td>
                            <td class="text-right" style="width: 8%;" id="totalPurchaseValueFooter">₹0.00</td>
                            <td class="text-right" style="width: 7%;">-</td>
                            <td class="text-right" style="width: 8%;" id="totalSoldValueFooter">₹0.00</td>
                            <td class="text-right" style="width: 8%;" id="totalStockValueFooter">₹0.00</td>
                        </tr>
                    </tfoot>
                </table>
            </div>
        </div>
    </div>

    <script>
        const PRINT_PARAMS = <?php echo json_encode([
            'startDate' => $startDate,
            'endDate' => $endDate,
            'supplierCode' => $supplierCode,
            'purchaseType' => $purchaseType,
            'itemCode' => $itemCode,
            'categoryId' => $categoryId,
        ]); ?>;

        function formatCurrency(amount) {
            return '₹' + Number(amount || 0).toLocaleString('en-IN', {
                minimumFractionDigits: 2,
                maximumFractionDigits: 2
            });
        }

        function formatNumber(num) {
            return Number(num || 0).toLocaleString('en-IN', {
                minimumFractionDigits: 2,
                maximumFractionDigits: 2
            });
        }

        function formatDate(dateStr) {
            if (!dateStr) return '-';
            const date = new Date(dateStr);
            const day = String(date.getDate()).padStart(2, '0');
            const month = String(date.getMonth() + 1).padStart(2, '0');
            const year = String(date.getFullYear()).substr(2);
            return `${day}/${month}/${year}`;
        }

        function formatDateTime(date) {
            return date.toLocaleString('en-IN', {
                day: '2-digit',
                month: 'short',
                year: 'numeric',
                hour: '2-digit',
                minute: '2-digit'
            });
        }

        function loadPrintReport() {
            const { startDate, endDate, supplierCode, purchaseType, itemCode, categoryId } = PRINT_PARAMS;
            let apiUrl = `api/get-item-wise-purchases.php?startDate=${startDate}&endDate=${endDate}`;
            if (supplierCode) {
                apiUrl += `&supplierCode=${encodeURIComponent(supplierCode)}`;
            }
            if (purchaseType) {
                apiUrl += `&purchaseType=${encodeURIComponent(purchaseType)}`;
            }
            if (itemCode) {
                apiUrl += `&itemCode=${encodeURIComponent(itemCode)}`;
            }
            if (categoryId) {
                apiUrl += `&categoryId=${encodeURIComponent(categoryId)}`;
            }

            fetch(apiUrl)
                .then(response => response.json())
                .then(data => {
                    if (!data.success) {
                        throw new Error(data.message || 'API error');
                    }
                    renderPrintReport(data);
                    setTimeout(() => window.print(), 400);
                })
                .catch(() => {
                    document.getElementById('loadingState').style.display = 'none';
                    document.getElementById('errorState').style.display = 'block';
                });
        }

        function renderPrintReport(data) {
            const { summary, items, startDate, endDate, supplierInfo, purchaseTypeInfo, categoryInfo, itemInfo } = data;

            document.getElementById('loadingState').style.display = 'none';
            document.getElementById('reportContent').style.display = 'block';

            const periodText = `${formatDate(startDate)} to ${formatDate(endDate)}`;
            document.getElementById('reportPeriod').textContent = periodText;
            
            if (categoryInfo) {
                document.getElementById('reportCategory').textContent = categoryInfo;
            } else {
                document.getElementById('categoryDiv').style.display = 'none';
            }
            
            if (itemInfo) {
                document.getElementById('reportItem').textContent = itemInfo.ItemName;
            } else {
                document.getElementById('itemDiv').style.display = 'none';
            }
            
            if (supplierInfo) {
                const supplierLabel = `${supplierInfo.SupplierName}`;
                document.getElementById('reportSupplier').textContent = supplierLabel;
            } else {
                document.getElementById('supplierDiv').style.display = 'none';
            }
            
            if (purchaseTypeInfo) {
                document.getElementById('reportPurchaseType').textContent = purchaseTypeInfo;
            } else {
                document.getElementById('purchaseTypeDiv').style.display = 'none';
            }
            
            document.getElementById('generatedDate').textContent = formatDateTime(new Date());

            document.getElementById('totalItems').textContent = summary.totalItems;
            document.getElementById('totalPurchased').textContent = formatNumber(summary.totalPurchased);
            document.getElementById('totalSold').textContent = formatNumber(summary.totalSold);
            document.getElementById('totalRemaining').textContent = formatNumber(summary.totalRemaining);
            document.getElementById('totalPurchaseValue').textContent = formatCurrency(summary.totalPurchaseValue);
            document.getElementById('totalSoldValue').textContent = formatCurrency(summary.totalSoldValue);
            document.getElementById('totalStockValue').textContent = formatCurrency(summary.totalStockValue);
            document.getElementById('totalInvoices').textContent = summary.totalInvoices;

            renderItemsTable(items, summary);
        }

        function renderItemsTable(items, summary) {
            const tbody = document.getElementById('itemsBody');

            document.getElementById('itemCount').textContent = items.length;

            if (!items.length) {
                tbody.innerHTML = '<tr><td colspan="14" class="text-center" style="padding: 20px;">No items found for the selected period.</td></tr>';
            } else {
                let rows = '';
                let serialNo = 1;

                items.forEach(item => {
                    let stockClass = '';
                    if (item.StockRemaining < 0) {
                        stockClass = 'text-danger';
                    } else if (item.StockRemaining === 0) {
                        stockClass = 'text-warning';
                    } else {
                        stockClass = 'text-success';
                    }
                    
                    rows += `
                        <tr>
                            <td class="text-center">${serialNo++}</td>
                            <td><strong>${item.ProductCode}</strong></td>
                            <td>${item.ProductName}</td>
                            <td>${item.CategoryName || '-'}</td>
                            <td>${item.BrandName || '-'}</td>
                            <td class="text-center">${item.UnitName || '-'}</td>
                            <td class="text-right"><strong>${formatNumber(item.TotalPurchased)}</strong></td>
                            <td class="text-right">${formatNumber(item.TotalSold)}</td>
                            <td class="text-right ${stockClass}"><strong>${formatNumber(item.StockRemaining)}</strong></td>
                            <td class="text-right">${formatCurrency(item.AvgPurchaseRate)}</td>
                            <td class="text-right amount-negative">${formatCurrency(item.TotalPurchaseValue)}</td>
                            <td class="text-right">${formatCurrency(item.AvgSalesRate)}</td>
                            <td class="text-right amount-positive">${formatCurrency(item.TotalSoldValue)}</td>
                            <td class="text-right ${stockClass}">${formatCurrency(item.StockValue)}</td>
                        </tr>
                    `;
                });

                tbody.innerHTML = rows;
            }

            document.getElementById('totalPurchasedFooter').textContent = formatNumber(summary.totalPurchased);
            document.getElementById('totalSoldFooter').textContent = formatNumber(summary.totalSold);
            document.getElementById('totalRemainingFooter').textContent = formatNumber(summary.totalRemaining);
            document.getElementById('totalPurchaseValueFooter').textContent = formatCurrency(summary.totalPurchaseValue);
            document.getElementById('totalSoldValueFooter').textContent = formatCurrency(summary.totalSoldValue);
            document.getElementById('totalStockValueFooter').textContent = formatCurrency(summary.totalStockValue);
        }

        document.addEventListener('DOMContentLoaded', loadPrintReport);
    </script>
</body>
</html>
