/**
 * V.AI STUDIO - Auto Patch GH Excel/PDF v1046
 * 
 * TỰ ĐỘNG PATCH mà không cần sửa index.html
 * Chỉ cần thêm dòng: <script src="auto-patch-gh-excel.js"></script> vào index.html
 * 
 * FIX:
 * - exportDeliveryExcel/PDF nhận order parameter đúng
 * - Click protection (chống bấm nhiều lần)  
 * - Blob retention 5 phút (tải nhiều lần được)
 */
(function() {
    'use strict';
    
    // === WAIT FOR VAI_QR READY ===
    function initPatch() {
        if (typeof window.VAI_QR === 'undefined') {
            setTimeout(initPatch, 500);
            return;
        }
        
        // === STORE ORIGINAL FOR REFERENCE ===
        var origExportDE = window.exportDeliveryExcel;
        var origExportDP = window.exportDeliveryPDF;
        
        // === HELPER: Convert order to quote data ===
        function orderToVAIData(order) {
            if (!order || !order.items) return null;
            return {
                qd: {
                    customer: {
                        name: order.customer || '',
                        phone: order.phone || '',
                        email: order.email || '',
                        addr: order.addr || '',
                        date: order.date || ''
                    },
                    items: (order.items || []).map(function(it, i) {
                        return {
                            stt: i + 1,
                            image: it.image || '',
                            name: it.name || '',
                            model: it.model || '',
                            specs: it.specs || it.info || '',
                            qty: it.qty || 1,
                            price: it.price || it.listPrice || it.discPrice || 0,
                            discPrice: it.discPrice || it.price || 0,
                            total: it.total || 0,
                            note: it.note || ''
                        };
                    }),
                    grandTotal: order.grandTotal || 0
                }
            };
        }
        
        // === CLICK STATE ===
        var activeExportBtn = null;
        
        function setBtnState(btn, exporting) {
            if (!btn) return;
            if (exporting) {
                btn.disabled = true;
                btn.dataset.vaiExporting = '1';
                btn._origHtml = btn.innerHTML;
                btn.innerHTML = '<span style="opacity:0.7">⏳</span>';
            } else {
                btn.disabled = false;
                btn.dataset.vaiExporting = '0';
                if (btn._origHtml) btn.innerHTML = btn._origHtml;
            }
        }
        
        // === PATCH EXPORT DELIVERY EXCEL ===
        window.exportDeliveryExcel = async function(order, opt) {
            var btn = document.activeElement;
            if (btn && btn.dataset.vaiExporting === '1') {
                console.log('[AutoPatch] Already exporting, ignoring...');
                return;
            }
            if (btn) setBtnState(btn, true);
            
            try {
                // If order provided, use it
                if (order && order.items && order.items.length) {
                    var vaData = orderToVAIData(order);
                    var code = order.code || 'GH-' + Date.now();
                    
                    // Use qr-payment.js internal function if available
                    if (window.VAI_QR && window.VAI_QR._doExportDeliveryExcel) {
                        await window.VAI_QR._doExportDeliveryExcel(vaData.qd, code);
                        console.log('[AutoPatch] GH Excel done for order: ' + code);
                        return;
                    }
                    
                    // Fallback: rebuild HTML manually
                    if (window.VAI_QR && window.VAI_QR.buildDeliveryHTML) {
                        let html = window.VAI_QR.buildDeliveryHTML(vaData.qd, code);
                        let div = document.createElement('div');
                        div.style.cssText = 'position:absolute;left:-9999px;top:0;width:700px;background:#fff;padding:28px';
                        div.innerHTML = html;
                        document.body.appendChild(div);
                        
                        await new Promise(r => setTimeout(r, 300));
                        
                        if (window.ExcelJS) {
                            let wb = new ExcelJS.Workbook();
                            let ws = wb.addWorksheet('Giao hàng');
                            ws.views = [{showGridLines: false}];
                            ws.columns = [{width: 5}, {width: 34}, {width: 14}, {width: 8}, {width: 20}];
                            
                            ws.getCell('A1').value = 'PHIẾU GIAO HÀNG';
                            ws.getCell('A2').value = 'KH: ' + (vaData.qd.customer.name || '');
                            ws.getCell('D2').value = 'Mã: ' + code;
                            ws.getCell('A3').value = 'SĐT: ' + (vaData.qd.customer.phone || '');
                            ws.getCell('A4').value = 'Địa chỉ: ' + (vaData.qd.customer.addr || '');
                            
                            let headerRow = ws.getRow(6);
                            ['STT', 'Tên sản phẩm', 'Mã SP', 'SL', 'Ghi chú'].forEach(function(h, i) {
                                let c = headerRow.getCell(i + 1);
                                c.value = h;
                                c.fill = {type: 'pattern', pattern: 'solid', fgColor: {argb: 'FF003F62'}};
                                c.font = {bold: true, color: {argb: 'FFFFFFFF'}};
                            });
                            
                            let cr = 7;
                            (vaData.qd.items || []).forEach(function(it) {
                                let row = ws.getRow(cr);
                                row.getCell(1).value = it.stt;
                                row.getCell(2).value = it.name;
                                row.getCell(3).value = it.model;
                                row.getCell(4).value = it.qty;
                                row.getCell(5).value = it.note;
                                cr++;
                            });
                            
                            let buf = await wb.xlsx.writeBuffer();
                            let blob = new Blob([buf], {type: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet'});
                            let url = URL.createObjectURL(blob);
                            let a = document.createElement('a');
                            a.href = url;
                            a.download = 'GH-' + code + '.xlsx';
                            a.click();
                            // Keep blob for 5 minutes
                            setTimeout(() => URL.revokeObjectURL(url), 300000);
                        }
                        div.remove();
                        return;
                    }
                }
                
                // Fallback to original
                if (origExportDE) {
                    await origExportDE.call(this, order, opt);
                }
            } catch (e) {
                console.error('[AutoPatch] Export error:', e);
                if (typeof showToast === 'function') {
                    showToast('❌ Xuất file thất bại: ' + (e.message || e));
                }
            } finally {
                setTimeout(() => { if (btn) setBtnState(btn, false); }, 1000);
            }
        };
        
        // === PATCH EXPORT DELIVERY PDF ===
        window.exportDeliveryPDF = async function(order, opt) {
            var btn = document.activeElement;
            if (btn && btn.dataset.vaiExporting === '1') {
                console.log('[AutoPatch] Already exporting, ignoring...');
                return;
            }
            if (btn) setBtnState(btn, true);
            
            try {
                if (order && order.items && order.items.length) {
                    var vaData = orderToVAIData(order);
                    var code = order.code || 'GH-' + Date.now();
                    
                    if (window.VAI_QR && window.VAI_QR._doExportDeliveryPDF) {
                        await window.VAI_QR._doExportDeliveryPDF(vaData.qd, code);
                        console.log('[AutoPatch] GH PDF done for order: ' + code);
                        return;
                    }
                    
                    if (window.VAI_QR && window.VAI_QR.buildDeliveryHTML) {
                        let html = window.VAI_QR.buildDeliveryHTML(vaData.qd, code);
                        let div = document.createElement('div');
                        div.style.cssText = 'position:absolute;left:-9999px;top:0;width:700px;background:#fff;padding:28px';
                        div.innerHTML = html;
                        document.body.appendChild(div);
                        
                        await new Promise(r => setTimeout(r, 300));
                        
                        if (window.html2canvas && window.jspdf) {
                            let canvas = await html2canvas(div, {scale: 2, useCORS: true, backgroundColor: '#fff'});
                            let imgData = canvas.toDataURL('image/png');
                            let {jsPDF} = window.jspdf;
                            let pdf = new jsPDF({orientation: 'p', unit: 'pt', format: 'a4'});
                            let margin = 25;
                            let usableW = 595 - margin * 2;
                            let ratio = canvas.height / canvas.width;
                            let imgH = usableW * ratio;
                            pdf.addImage(imgData, 'PNG', margin, margin, usableW, imgH > 842 - margin * 2 ? 842 - margin * 2 : imgH);
                            pdf.save('GH-' + code + '.pdf');
                        }
                        div.remove();
                        return;
                    }
                }
                
                if (origExportDP) {
                    await origExportDP.call(this, order, opt);
                }
            } catch (e) {
                console.error('[AutoPatch] Export error:', e);
                if (typeof showToast === 'function') {
                    showToast('❌ Xuất file thất bại: ' + (e.message || e));
                }
            } finally {
                setTimeout(() => { if (btn) setBtnState(btn, false); }, 1000);
            }
        };
        
        console.log('[AutoPatch v1046] GH Excel/PDF patched - ready!');
    }
    
    // Start patching
    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', initPatch);
    } else {
        initPatch();
    }
    // Also run after delays (HF Spaces loads scripts dynamically)
    setTimeout(initPatch, 2000);
    setTimeout(initPatch, 5000);
    
})();