#!/usr/bin/env node
// ==============================================================================
// 从已生成的 HTML 报告中提取所有 slide section 的 HTML 内容
// 用途：PowerShell GBK 编码损坏 chapter 文件后的快照式恢复
// 输出：scripts/tools/voc-validation/_slides-snapshot.json
//   {
//     "method-1": { html: "...", tone: "green", slideNum: "03/42" },
//     ...
//   }
// ==============================================================================
const fs = require('fs');
const path = require('path');

const HTML_PATH = path.join('reports', 'jiangzhong-liver-voc-validation-report.html');
const OUT_PATH = path.join('scripts', 'tools', 'voc-validation', '_slides-snapshot.json');

function main() {
    const html = fs.readFileSync(HTML_PATH, 'utf8');

    // 用正则定位每个 <section class="report-section" id="..." ...>
    // 由于 section 里可能嵌套 section（eg. cover-hero 不是），但 report-section 不嵌套，
    // 采用首尾配对方式：从每个 <section class="report-section" 起点开始，寻找对应的 </section>
    const openRx = /<section\s+class="report-section"\s+id="([^"]+)"\s+data-tone="([^"]*)"\s+data-slide-num="([^"]+)"[^>]*>/g;
    const closeTag = '</section>';

    const starts = [];
    let m;
    while ((m = openRx.exec(html)) !== null) {
        starts.push({ id: m[1], tone: m[2], slideNum: m[3], start: m.index, headerEnd: m.index + m[0].length });
    }

    console.log(`Found ${starts.length} sections`);

    const snapshot = {};
    for (let i = 0; i < starts.length; i++) {
        const s = starts[i];
        // 找 section 的结束位置：从 headerEnd 开始，下一个 section 开始前最后一个 </section>
        const nextStart = i + 1 < starts.length ? starts[i + 1].start : html.length;
        const closeIdx = html.lastIndexOf(closeTag, nextStart);
        if (closeIdx < s.headerEnd) {
            console.warn(`[WARN] cannot find close for ${s.id}`);
            continue;
        }
        const fullHtml = html.slice(s.start, closeIdx + closeTag.length);
        snapshot[s.id] = {
            tone: s.tone,
            slideNum: s.slideNum,
            html: fullHtml,
        };
        console.log(`  ${s.id.padEnd(18)} ${s.tone.padEnd(8)} ${s.slideNum}  (${fullHtml.length} bytes)`);
    }

    fs.mkdirSync(path.dirname(OUT_PATH), { recursive: true });
    fs.writeFileSync(OUT_PATH, JSON.stringify(snapshot, null, 2), 'utf8');
    console.log(`\n✓ 写入 ${OUT_PATH}  (${Object.keys(snapshot).length} sections)`);
}

main();