City-Lifeline-Cockpit/.scratch/lanhu-cockpit-asset-replacement/research/download-assets.mjs

// 下载可下载资产到 design-archive/，生成带 sha256 的索引
import { readFileSync, writeFileSync, mkdirSync, createWriteStream } from 'node:fs'
import { createHash } from 'node:crypto'
import { join } from 'node:path'
import { Readable } from 'node:stream'
import { pipeline } from 'node:stream/promises'

const raw = '.scratch/lanhu-cockpit-asset-replacement/research/raw'
const outDir = '.scratch/lanhu-cockpit-asset-replacement/design-archive'
mkdirSync(outDir, { recursive: true })

const index = JSON.parse(readFileSync(join(raw, 'asset-index.json'), 'utf8'))

const slug = (s) => s.replace(/[^\w\u4e00-\u9fa5.-]+/g, '_').slice(0, 40)
const extOf = (u) => {
    const m = /\.([a-z0-9]+)(\?|$)/i.exec(u)
    return m ? m[1].toLowerCase() : 'bin'
}

const tasks = []
// 1) 图片填充（去重 URL，保留首次出现的来源画板）
const seen = new Map()
for (const f of index.imageFills) {
    if (!seen.has(f.url)) seen.set(f.url, f)
}
for (const [url, f] of seen) {
    tasks.push({ kind: 'image-fill', artboard: f.artboard, layer: f.path, w: f.w, h: f.h, url })
}
// 2) 项目级 assets（无名字，按画板顺序编号）
const perArtboard = new Map()
for (const a of index.assetUrls) {
    const n = (perArtboard.get(a.artboard) || 0) + 1
    perArtboard.set(a.artboard, n)
    tasks.push({ kind: 'slice', artboard: a.artboard, layer: `slice-${String(n).padStart(2, '0')}`, w: null, h: null, url: a.url })
}

const results = []
for (const t of tasks) {
    const ext = extOf(t.url)
    const hash8 = (t.url.match(/([0-9a-f]{8})[0-9a-f]*\.[a-z0-9]+$/i) || [, 'unknown'])[1]
    const name = `${slug(t.artboard)}__${t.kind}__${slug(t.layer)}__${hash8}.${ext}`
    const dest = join(outDir, name)
    const res = await fetch(t.url)
    if (!res.ok) {
        results.push({ ...t, local: null, error: `HTTP ${res.status}` })
        continue
    }
    await pipeline(Readable.fromWeb(res.body), createWriteStream(dest))
    const buf = readFileSync(dest)
    results.push({
        kind: t.kind,
        artboard: t.artboard,
        layer: t.layer,
        w: t.w,
        h: t.h,
        url: t.url,
        local: name,
        bytes: buf.length,
        sha256: createHash('sha256').update(buf).digest('hex'),
    })
}

writeFileSync(join(outDir, 'index.json'), JSON.stringify({ downloadedAt: new Date().toISOString(), count: results.length, files: results }, null, 1))
console.log('downloaded:', results.filter((r) => !r.error).length, 'of', tasks.length)
for (const r of results) console.log(`  ${r.error ? 'ERR ' + r.error : r.local} | ${r.kind} | ${r.artboard} | ${r.layer} | ${r.bytes ?? ''}`)