#!/usr/bin/env node
/**
 * ds-compare.mjs — 还原保真目检编排（原型基准 ↔ Flutter golden 并排）
 *
 * design-distill 阶段4「保真闸」的项目侧一键流程：对某屏，按 A/B/C 三主题
 * 截原型基准图，再与已生成的 Flutter golden 用 montage 并排，产出对比图供人工目检。
 * 跨渲染器（Chromium↔Skia）不跑严格 pixelmatch；回归靠 Flutter golden 自比（flutter test）。
 *
 * 前置：先生成 Flutter golden：
 *   cd client && flutter test --update-goldens test/golden/<screen>_golden_test.dart
 *
 * 用法（从仓库根运行）：
 *   node tools/ds-compare.mjs --html .superpowers/prototype/screens/inventory.html \
 *     --prefix inventory_list [--themes a,b,c] [--width 1280] [--height 860] [--wait-for .app]
 *
 * 输出：design/_compare/<prefix>_<theme>.png（gitignore，可重生）。
 * 依赖：design-distill skill（shoot-prototype.mjs / montage.mjs），默认 ~/.claude/skills/design-distill，可用 DD_SKILL 覆盖。
 */
import { parseArgs } from 'node:util';
import { execFileSync } from 'node:child_process';
import { mkdirSync, existsSync } from 'node:fs';
import { homedir } from 'node:os';
import { join, resolve } from 'node:path';

const { values } = parseArgs({
  options: {
    html: { type: 'string' },
    prefix: { type: 'string' },
    themes: { type: 'string', default: 'a,b,c' },
    width: { type: 'string', default: '1280' },
    height: { type: 'string', default: '860' },
    'wait-for': { type: 'string', default: '.app' },
    'goldens-dir': { type: 'string', default: 'client/test/golden/goldens' },
    help: { type: 'boolean', default: false },
  },
});

if (values.help || !values.html || !values.prefix) {
  console.log(`用法: node tools/ds-compare.mjs --html <原型.html> --prefix <golden前缀> [--themes a,b,c --width 1280 --height 860 --wait-for .app]`);
  process.exit(values.help ? 0 : 1);
}

const SKILL = process.env.DD_SKILL || join(homedir(), '.claude/skills/design-distill');
const shoot = join(SKILL, 'tools/shoot-prototype.mjs');
const montage = join(SKILL, 'tools/montage.mjs');
for (const t of [shoot, montage]) {
  if (!existsSync(t)) { console.error(`[ds-compare] 找不到 skill 工具: ${t}（设 DD_SKILL 覆盖）`); process.exit(2); }
}

const outDir = 'design/_compare';
mkdirSync(outDir, { recursive: true });
const themes = values.themes.split(',').map((s) => s.trim()).filter(Boolean);

for (const theme of themes) {
  const base = join(outDir, `${values.prefix}_proto_${theme}.png`);
  const golden = resolve(values['goldens-dir'], `${values.prefix}_${theme}.png`);
  const out = join(outDir, `${values.prefix}_${theme}.png`);

  execFileSync('node', [shoot, values.html, base,
    '--width', values.width, '--height', values.height,
    '--theme', theme, '--lang', 'zh', '--wait-for', values['wait-for']],
    { stdio: 'inherit' });

  if (!existsSync(golden)) {
    console.error(`[ds-compare] ⚠ 缺 Flutter golden: ${golden} —— 先跑 flutter test --update-goldens。跳过 ${theme} 的并排。`);
    continue;
  }
  execFileSync('node', [montage, out, base, golden, '--dir', 'v'], { stdio: 'inherit' });
  console.log(`[ds-compare] ✅ ${theme}: ${out}（上=原型 下=Flutter，人工目检）`);
}