// Recover only already-retained REA CSS; never access the installed application here.
import fs from 'node:fs/promises'
import { createHash } from 'node:crypto'
import postcss from 'postcss'
const sha = value => createHash('sha256').update(value).digest('hex')
const evidenceId = 'ev_40da6df0424193923bae64a8ccb6fca97ea67813d7de671986d4d7e154b848c1'
const evidence = JSON.parse(await fs.readFile(`.tmp/rea-css-evidence/${evidenceId}.json`, 'utf8'))
if (evidence.evidence_id !== evidenceId) throw new Error('REA identity mismatch')
const module = evidence.normalized_result.styles.items.find(item => /settings-window-perf-ILa933LI.css$/.test(item.file_path))
const windowCss = module.source.artifact.text
if (sha(windowCss) !== '8036657ec27f8948c6bad60c835d62469e958db4a5b9c25e22e5a9e60c0ea986') throw new Error('Window CSS changed')
const contexts = await fs.readFile('.tmp/rea-css-recovered/contexts-BkjwYSZT.css', 'utf8')
if (sha(contexts) !== '50cbd673f7f35fc7f966bdddc6c9f5677fdfe944cb904888d214619fca259380') throw new Error('Contexts CSS changed')
const tokens = await fs.readFile('.tmp/rea-css-recovered/tokens-Df-i-zsO.css', 'utf8')
const tokensSha = sha(tokens)
if (tokensSha !== '13f2bf82c96e5167a7d7098e36950c6c22c475b3337dbb8bb29ad2fe79cde696') throw new Error('Tokens CSS changed')
function project(node) {
  if (node.type === 'rule') {
    const selectors = node.selectors.filter(selector => /\.settings-(modal|navigation)/.test(selector))
    return selectors.length ? node.clone({ selector: selectors.join(',') }) : null
  }
  if (node.type === 'atrule' && node.nodes) {
    const nodes = node.nodes.map(project).filter(Boolean)
    return nodes.length ? node.clone({ nodes }) : null
  }
  return null
}
const root = postcss.root({ nodes: postcss.parse(contexts).nodes.map(project).filter(Boolean) })
// 原版把 `--wb-*` 设计变量放在全局 :root（tokens 样式表）；YCode 没有全局 token 表，按组件作用域复制。
// 设置窗口的根元素是 `.settings-window-root`（原生设置窗口）或 `.settings-modal-overlay`（主窗口内浮层），
// 而 `.settings-modal` 自身也直接引用这些变量（背景、圆角、滚动条），因此两处都定义一份，
// 深色块让 [data-theme=dark] 下的窗口背景/文字/滚动条随主题切换（TODO 11）。
const lightTokens = new Map()
const darkTokens = new Map()
for (const rule of postcss.parse(tokens).nodes) {
  if (rule.type !== 'rule') continue
  const selectors = rule.selectors ?? []
  const dark = selectors.some(selector => selector.includes('[data-theme=dark]'))
  const light = selectors.some(selector => selector.trim() === ':root')
  if (!dark && !light) continue
  for (const node of rule.nodes ?? []) {
    if (node.type !== 'decl' || !node.prop.startsWith('--')) continue
    if (dark) darkTokens.set(node.prop, node.value)
    if (light) lightTokens.set(node.prop, node.value)
  }
}
const referenced = new Set()
const collect = (text) => { for (const match of text.matchAll(/var\(\s*(--[\w-]+)/g)) referenced.add(match[1]) }
collect(root.toString())
collect(windowCss)
for (let depth = 0; depth < 6; depth++) {
  const before = referenced.size
  for (const name of [...referenced]) {
    const value = lightTokens.get(name) ?? darkTokens.get(name)
    if (typeof value === 'string') collect(value)
  }
  if (referenced.size === before) break
}
const missing = [...referenced].filter(name => !lightTokens.has(name))
if (missing.length) console.log(`Tokens missing from light root scope: ${missing.join(', ')}`)
const pick = (map) => new Map([...referenced].filter(name => map.has(name)).map(name => [name, map.get(name)]))
const scope = (selectors, map) => `${selectors}{${[...map].map(([property, value]) => `${property}:${value}`).join(';')}}`
const shellScope = '.settings-window-root,.settings-modal'
const darkScope = ':root[data-theme=dark] .settings-window-root,:root[data-theme=dark] .settings-modal'
const scopedTokens = `${scope(shellScope, pick(lightTokens))}\n${scope(darkScope, pick(darkTokens))}\n`
await fs.writeFile('src/renderer/src/components/settings-shell-source.css', `/* REA ${evidenceId}; settings-window CSS sha256=${sha(windowCss)}; contexts sha256=${sha(contexts)}; tokens sha256=${tokensSha}. */\n${root.toString()}\n${windowCss}\n${scopedTokens}`)
console.log(`Recovered settings shell CSS with original media conditions; scoped ${pick(lightTokens).size} light / ${pick(darkTokens).size} dark tokens`)