import { bindData } from "./dynamicBinder";

function generateTextElement(el, data) {
    const fontWeight = el.bold ? "bold" : el.fontWeight || "normal";
    const fontStyle = el.italic ? "italic" : "normal";
    const textDecoration = el.underline ? "underline" : "none";
    
    return `
        <div style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            font-size: ${el.fontSize}px;
            font-family: ${el.fontFamily || 'Arial'};
            font-weight: ${fontWeight};
            font-style: ${fontStyle};
            text-decoration: ${textDecoration};
            color: ${el.color || '#000000'};
            text-align: ${el.align || 'left'};
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
            white-space: pre-wrap;
        ">
            ${bindData(el.text, data)}
        </div>
    `;
}

function generateImageElement(el, data) {
    if (!el.src) return '';
    
    return `
        <img src="${bindData(el.src, data)}" style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            width: ${el.width}px;
            height: ${el.height}px;
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
        " />
    `;
}

function generateQRCodeElement(el, data) {
    // For HTML export, we'll use a QR code API or placeholder
    const qrData = encodeURIComponent(bindData(el.data, data));
    const qrUrl = `https://api.qrserver.com/v1/create-qr-code/?size=${el.size}x${el.size}&data=${qrData}`;
    
    return `
        <img src="${qrUrl}" style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            width: ${el.size}px;
            height: ${el.size}px;
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
        " />
    `;
}

function generateLineElement(el) {
    return `
        <div style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            width: ${el.width}px;
            height: ${el.thickness}px;
            background-color: ${el.color || '#000000'};
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
        "></div>
    `;
}

function generateRectangleElement(el) {
    return `
        <div style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            width: ${el.width}px;
            height: ${el.height}px;
            background-color: ${el.fill || 'transparent'};
            border: ${el.strokeWidth || 0}px solid ${el.stroke || '#000000'};
            border-radius: ${el.cornerRadius || 0}px;
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
            box-sizing: border-box;
        "></div>
    `;
}

function generateTableElement(el, data) {
    const visibleColumns = el.columns.filter(col => col.visible);
    const tableData = data?.tableData || el.sampleData || [];
    
    let tableHtml = `
        <div style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
        ">
            <table style="
                border-collapse: collapse;
                width: auto;
            ">
                <thead>
                    <tr>
    `;
    
    // Header row
    visibleColumns.forEach(col => {
        tableHtml += `
                        <th style="
                            width: ${col.width}px;
                            height: ${el.rowHeight}px;
                            background-color: ${el.headerBg || '#f0f0f0'};
                            border: 1px solid ${el.borderColor || '#000000'};
                            padding: 5px;
                            font-size: 12px;
                            font-weight: bold;
                            text-align: left;
                        ">
                            ${col.label}
                        </th>
        `;
    });
    
    tableHtml += `
                    </tr>
                </thead>
                <tbody>
    `;
    
    // Data rows
    if (el.showSampleData && tableData.length > 0) {
        tableData.forEach(row => {
            tableHtml += '<tr>';
            visibleColumns.forEach(col => {
                const cellValue = bindData(row[col.key] || '', data);
                tableHtml += `
                            <td style="
                                width: ${col.width}px;
                                height: ${el.rowHeight}px;
                                border: 1px solid ${el.borderColor || '#000000'};
                                padding: 5px;
                                font-size: 11px;
                                text-align: left;
                            ">
                                ${cellValue}
                            </td>
                `;
            });
            tableHtml += '</tr>';
        });
    }
    
    tableHtml += `
                </tbody>
            </table>
        </div>
    `;
    
    return tableHtml;
}

function generateSummaryElement(el, data) {
    const visibleFields = el.fields.filter(field => field.visible);
    
    let summaryHtml = `
        <div style="
            position: absolute;
            top: ${el.y}px;
            left: ${el.x}px;
            transform: rotate(${el.rotation || 0}deg);
            transform-origin: top left;
        ">
    `;
    
    visibleFields.forEach((field, index) => {
        const yPos = index * (el.fontSize + el.spacing);
        const value = bindData(`{{${field.key}}}`, data);
        
        summaryHtml += `
            <div style="
                position: relative;
                margin-bottom: ${el.spacing}px;
                display: flex;
                align-items: center;
            ">
                <span style="
                    font-size: ${el.fontSize}px;
                    color: ${el.labelColor || '#000000'};
                    font-weight: bold;
                    display: inline-block;
                    width: ${field.width}px;
                ">
                    ${field.label}:
                </span>
                <span style="
                    font-size: ${el.fontSize}px;
                    color: ${el.valueColor || '#000000'};
                    margin-left: 10px;
                ">
                    ${value}
                </span>
            </div>
        `;
    });
    
    summaryHtml += '</div>';
    return summaryHtml;
}

export function generateHtml(template, data = {}) {
    const elementsHtml = template.elements
        .map((el) => {
            switch (el.type) {
                case "text":
                    return generateTextElement(el, data);
                case "image":
                    return generateImageElement(el, data);
                case "qrcode":
                    return generateQRCodeElement(el, data);
                case "line":
                    return generateLineElement(el);
                case "rectangle":
                    return generateRectangleElement(el);
                case "table":
                    return generateTableElement(el, data);
                case "summary":
                    return generateSummaryElement(el, data);
                default:
                    return "";
            }
        })
        .join("");

    return `
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Invoice</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: Arial, sans-serif;
            background: #f5f5f5;
            padding: 20px;
        }
        
        .page-container {
            position: relative;
            width: ${template.page.width}px;
            height: ${template.page.height}px;
            background: white;
            margin: 0 auto;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }
        
        @media print {
            body {
                background: white;
                padding: 0;
            }
            
            .page-container {
                width: ${template.page.width}px;
                height: ${template.page.height}px;
                box-shadow: none;
                margin: 0;
                page-break-after: always;
            }
            
            @page {
                size: ${template.page.width}px ${template.page.height}px;
                margin: 0;
            }
        }
    </style>
</head>
<body>
    <div class="page-container">
        ${elementsHtml}
    </div>
</body>
</html>
    `;
}