/**
 * V.AI STUDIO — Excel Multi-Download Complete Fix
 * ============================================
 * FIX TRIỆT ĐỐI cho vấn đề: File Excel chỉ tải được 1 lần
 * 
 * Áp dụng cho:
 * - Modal "Lập báo giá" -> nút 💾 Excel
 * - Modal "Đơn hàng" -> nút 💾 Lưu, GH Excel
 */
(function() {
    'use strict';
    
    // Registry quản lý blob URLs
    var blobRegistry = [];
    var isUnloading = false;
    
    // Cleanup khi tab đóng
    function cleanupAllBlobs() {
        isUnloading = true;
        blobRegistry.forEach(function(entry) {
            if (!entry.revoked && entry.url) {
                try { URL.revokeObjectURL(entry.url); entry.revoked = true; } catch (e) {}
            }
        });
        blobRegistry = [];
    }
    
    window.addEventListener('pagehide', cleanupAllBlobs);
    window.addEventListener('beforeunload', cleanupAllBlobs);
    window.addEventListener('unload', cleanupAllBlobs);
    
    // PATCH URL.revokeObjectURL - không revoke blob URLs khi chưa unload
    (function() {
        var origRevoke = URL.revokeObjectURL;
        URL.revokeObjectURL = function(url) {
            if (isUnloading || !url || !url.startsWith('blob:')) {
                return origRevoke.apply(this, arguments);
            }
            // Chỉ đăng ký, không revoke
            var found = blobRegistry.find(function(e) { return e.url === url; });
            if (!found) {
                blobRegistry.push({ url: url, revoked: false, created: Date.now() });
            }
        };
    })();
    
    // PATCH exportExcel - Báo giá
    var origExportExcel = window.exportExcel;
    window.exportExcel = async function() {
        if (typeof ExcelJS === 'undefined') {
            if (typeof showToast === 'function') showToast('⚠️ Chưa có ExcelJS');
            return;
        }
        
        // Lấy dữ liệu
        var d, qd, code, qrUrl;
        if (window.VAI_QR && typeof window.VAI_QR.getData === 'function') {
            d = window.VAI_QR.getData();
            qd = d.qd;
            code = window.VAI_QR.getEffectiveOrderCode();
            qrUrl = window.VAI_QR.getQRUrl(d.remaining || d.grandTotal, code);
        } else if (window._origGetQuoteData) {
            qd = window._origGetQuoteData();
            code = 'VAS-' + Date.now();
            d = { grandTotal: qd.grandTotal || 0, remaining: qd.grandTotal || 0 };
        } else {
            if (typeof showToast === 'function') showToast('⚠️ Lỗi dữ liệu');
            return;
        }
        
        // TẠO MỚI hoàn toàn
        var wb = new ExcelJS.Workbook();
        var ws = wb.addWorksheet('Báo giá');
        
        ws.views = [{ showGridLines: false }];
        ws.columns = [{ width: 5 }, { width: 34 }, { width: 18 }, { width: 10 }, { width: 15 }];
        
        // Header
        ws.mergeCells('A1:E1');
        ws.getCell('A1').value = 'BẢNG BÁO GIÁ V.AI STUDIO';
        ws.getCell('A1').font = { bold: true, size: 16, color: { argb: 'FF003F62' } };
        ws.getCell('A1').alignment = { horizontal: 'center', vertical: 'middle' };
        ws.getCell('A1').fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFF0F7FF' } };
        
        // Customer info
        ws.getCell('A2').value = 'Khách hàng:';
        ws.mergeCells('B2:D2');
        ws.getCell('B2').value = (qd.customer ? qd.customer.name : '') || '';
        
        ws.getCell('A3').value = 'SĐT:';
        ws.getCell('B3').value = (qd.customer ? qd.customer.phone : '') || '';
        ws.getCell('D3').value = 'Mã đơn: ' + code;
        
        ws.getCell('A4').value = 'Địa chỉ:';
        ws.mergeCells('B4:E4');
        ws.getCell('B4').value = (qd.customer ? qd.customer.addr : '') || '';
        
        // Header row
        var hr = ws.getRow(6);
        ['STT', 'Tên sản phẩm', 'Mã SP', 'SL', 'Giá'].forEach(function(h, i) {
            var c = hr.getCell(i + 1);
            c.value = h;
            c.font = { bold: true, color: { argb: 'FFFFFFFF' } };
            c.fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FF003F62' } };
        });
        
        // Items
        var cr = 7, total = 0;
        (qd.items || []).forEach(function(it, i) {
            var row = ws.getRow(cr);
            row.values = [i + 1, it.name || '', it.model || '', it.qty || 1, (it.discPrice || it.price || 0) * (it.qty || 1)];
            if ((it.discPrice || it.price) > 0) {
                row.getCell(5).numFmt = '#,##0"đ"';
            }
            row.getCell(5).font = { bold: true };
            total += (it.discPrice || it.price || 0) * (it.qty || 1);
            cr++;
        });
        
        // Total
        ws.mergeCells(cr, 1, cr, 4);
        ws.getCell('A' + cr).value = 'TỔNG CỘNG';
        ws.getCell('A' + cr).font = { bold: true, size: 12 };
        ws.getCell('E' + cr).value = total;
        ws.getCell('E' + cr).font = { bold: true, size: 14, color: { argb: 'FF003F62' } };
        ws.getCell('E' + cr).numFmt = '#,##0"đ"';
        
        // Download - KHÔNG revoke
        var buf = await wb.xlsx.writeBuffer();
        var blob = new Blob([buf], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
        var url = URL.createObjectURL(blob);
        
        // Đăng ký để cleanup khi unload
        blobRegistry.push({ url: url, revoked: false, created: Date.now() });
        
        var a = document.createElement('a');
        a.href = url;
        a.download = code + '.xlsx';
        document.body.appendChild(a);
        a.click();
        setTimeout(function() { document.body.removeChild(a); }, 100);
        
        if (typeof showToast === 'function') {
            showToast('✅ Đã tải ' + code + '.xlsx');
        }
    };
    
    // PATCH exportDeliveryExcel - Giao hàng
    var origExportDeliveryExcel = window.exportDeliveryExcel;
    window.exportDeliveryExcel = async function(order, opt) {
        if (typeof ExcelJS === 'undefined') {
            if (typeof showToast === 'function') showToast('⚠️ Chưa có ExcelJS');
            return;
        }
        
        // Lấy dữ liệu qd
        var qd;
        if (order && order.items) {
            qd = {
                customer: {
                    name: order.customer || '',
                    phone: order.phone || '',
                    addr: order.addr || '',
                    date: order.date || ''
                },
                items: (order.items || []).map(function(it, i) {
                    return {
                        stt: i + 1,
                        name: it.name || '',
                        model: it.model || '',
                        qty: it.qty || 1,
                        note: it.note || ''
                    };
                })
            };
        } else if (window._origGetQuoteData) {
            qd = window._origGetQuoteData();
        } else if (window.VAI_QR && window.VAI_QR.getData) {
            qd = window.VAI_QR.getData().qd;
        } else {
            if (typeof showToast === 'function') showToast('⚠️ Lỗi dữ liệu');
            return;
        }
        
        var code = (order && order.code) ? order.code : 
                   (window.VAI_QR ? window.VAI_QR.getEffectiveOrderCode() : 'VAS-GH');
        
        // TẠO MỚI hoàn toàn
        var wb = new ExcelJS.Workbook();
        var ws = wb.addWorksheet('Giao hàng');
        
        ws.views = [{ showGridLines: false }];
        ws.columns = [{ width: 5 }, { width: 34 }, { width: 14 }, { width: 8 }, { width: 20 }];
        
        // Header
        ws.mergeCells('A1:E1');
        ws.getCell('A1').value = 'PHIẾU GIAO HÀNG';
        ws.getCell('A1').font = { bold: true, size: 16, color: { argb: 'FF003F62' } };
        ws.getCell('A1').alignment = { horizontal: 'center' };
        ws.getCell('A1').fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FFF0F7FF' } };
        
        // Customer info
        ws.getCell('A2').value = 'KH: ' + (qd.customer ? qd.customer.name : '');
        ws.getCell('D2').value = 'Mã: ' + code;
        
        ws.getCell('A3').value = 'SĐT: ' + (qd.customer ? qd.customer.phone : '');
        ws.getCell('D3').value = 'Ngày: ' + (qd.customer ? (qd.customer.date || '') : '');
        
        ws.getCell('A4').value = 'Địa chỉ: ' + (qd.customer ? (qd.customer.addr || '') : '');
        
        // Header row
        var hr = ws.getRow(6);
        ['STT', 'Tên sản phẩm', 'Mã SP', 'SL', 'Ghi chú'].forEach(function(h, i) {
            var c = hr.getCell(i + 1);
            c.value = h;
            c.font = { bold: true, color: { argb: 'FFFFFFFF' } };
            c.fill = { type: 'pattern', pattern: 'solid', fgColor: { argb: 'FF003F62' } };
        });
        
        // Items
        var cr = 7, totalQty = 0;
        (qd.items || []).forEach(function(it, i) {
            var row = ws.getRow(cr);
            row.values = [i + 1, it.name || '', it.model || '', it.qty || 1, it.note || ''];
            totalQty += (it.qty || 1);
            cr++;
        });
        
        // Total
        var tr = ws.getRow(cr);
        ws.mergeCells(cr, 1, cr, 3);
        ws.getCell('A' + cr).value = 'TỔNG CỘNG SỐ LƯỢNG';
        ws.getCell('D' + cr).value = totalQty;
        
        // Signature
        cr += 2;
        ws.getCell('A' + cr).value = 'Bên giao: ________________';
        ws.getCell('D' + cr).value = 'Bên nhận: ________________';
        
        // Download - KHÔNG revoke
        var buf = await wb.xlsx.writeBuffer();
        var blob = new Blob([buf], { type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet' });
        var url = URL.createObjectURL(blob);
        
        // Đăng ký để cleanup khi unload
        blobRegistry.push({ url: url, revoked: false, created: Date.now() });
        
        var a = document.createElement('a');
        a.href = url;
        a.download = 'GH-' + code + '.xlsx';
        document.body.appendChild(a);
        a.click();
        setTimeout(function() { document.body.removeChild(a); }, 100);
        
        if (typeof showToast === 'function') {
            showToast('✅ Đã tải GH-' + code + '.xlsx');
        }
    };
    
    console.log('[Excel Multi-Fix Complete] Loaded - Supports unlimited downloads!');
})();