// ==============================================================================
// VOC 验证报告 · Ch4 定位与话术 · 5 子章（快照模式）
// 详见 ch2-package.js 头部说明。
// ==============================================================================
const fs = require('fs');
const path = require('path');

let _snapshot = null;
function getSnapshot() {
    if (!_snapshot) {
        _snapshot = JSON.parse(fs.readFileSync(
            path.join(__dirname, '..', '_slides-snapshot.json'), 'utf8',
        ));
    }
    return _snapshot;
}

function fromSnapshot(id, slideNum) {
    const sec = getSnapshot()[id];
    if (!sec) {
        return `<section class="report-section" id="${id}" data-slide-num="${slideNum}"><div class="section-inner"><h2 class="text-h1">[Missing] ${id}</h2></div></section>`;
    }
    return sec.html.replace(/data-slide-num="[^"]+"/, `data-slide-num="${slideNum}"`);
}

function renderPositioning1DMY({ slideNum } = {}) { return fromSnapshot('positioning-1', slideNum); }
function renderPositioning2Safety({ slideNum } = {}) { return fromSnapshot('positioning-2', slideNum); }
function renderPositioning3Antidote({ slideNum } = {}) { return fromSnapshot('positioning-3', slideNum); }
function renderPositioning4Social({ slideNum } = {}) { return fromSnapshot('positioning-4', slideNum); }
function renderPositioning5Channel({ slideNum } = {}) { return fromSnapshot('positioning-5', slideNum); }

module.exports = {
    renderPositioning1DMY,
    renderPositioning2Safety,
    renderPositioning3Antidote,
    renderPositioning4Social,
    renderPositioning5Channel,
};