/* 抓取微信读书「最近在读」，写出 src/data/reading.json
 *
 * 用法:
 *   pnpm reading              手动刷新（失败会 exit 1，明确报错）
 *   pnpm reading --top 12     抓前 12 本，默认 8
 *   node scripts/fetch-reading.mjs --soft   失败时保留旧数据并 exit 0（构建流程用）
 *
 * 接口是腾讯官方的微信读书 Agent Gateway：
 *   POST https://i.weread.qq.com/api/agent/gateway
 *   Authorization: Bearer wrk-...   ← 从 .env 的 WEREAD_API_KEY 读
 *   体里必须有 api_name + skill_version，业务参数平铺在顶层（不能包进 params）
 *
 * Key 申请：https://weread.qq.com/r/weread-skills 扫码
 *
 * 两处实测得到的结论，别被直觉带偏：
 *   1. /shelf/sync 一次就给全了封面/书名/作者/分类/最近阅读时间/跳转链接，
 *      只有「阅读进度」要额外调 /book/getprogress，所以请求数 = 1 + N
 *   2. book.recordReadingTime 恒为 0，拿不到累计时长，所以卡片不做这一项
 */

import fs from "node:fs"
import path from "node:path"

const ENDPOINT = "https://i.weread.qq.com/api/agent/gateway"
/** 与官方 SKILL.md 顶部的 version 保持一致；服务端会用它对版本 */
const SKILL_VERSION = "1.0.4"
const OUT_FILE = "src/data/reading.json"
const DEFAULT_TOP = 8
const REQUEST_TIMEOUT_MS = 15_000
const DELAY_BETWEEN_CALLS_MS = 150

const args = process.argv.slice(2)
const SOFT = args.includes("--soft")
const topIndex = args.indexOf("--top")
const TOP_N = topIndex >= 0 ? Number(args[topIndex + 1]) || DEFAULT_TOP : DEFAULT_TOP

// .env 已 gitignore；Node 22 自带 loadEnvFile，不需要 dotenv
try {
  process.loadEnvFile(".env")
} catch {
  // 没有 .env 就只认真正的环境变量
}

const apiKey = process.env.WEREAD_API_KEY

const sleep = (ms) => new Promise((resolve) => setTimeout(resolve, ms))

async function call(apiName, params = {}) {
  const res = await fetch(ENDPOINT, {
    method: "POST",
    headers: {
      Authorization: `Bearer ${apiKey}`,
      "Content-Type": "application/json",
    },
    body: JSON.stringify({ api_name: apiName, skill_version: SKILL_VERSION, ...params }),
    signal: AbortSignal.timeout(REQUEST_TIMEOUT_MS),
  })

  const json = await res.json().catch(() => null)

  if (json?.upgrade_info) {
    console.warn(`⚠️  服务端要求升级 Skill：${json.upgrade_info.message ?? "(无说明)"}`)
  }
  if (res.status === 401 || json?.errcode === -2010) {
    throw new Error(
      `WEREAD_API_KEY 无效或已过期（HTTP ${res.status}${json?.errmsg ? `：${json.errmsg}` : ""}）。` +
        `去 https://weread.qq.com/r/weread-skills 重新拿一个。`,
    )
  }
  if (!res.ok || (json?.errcode !== undefined && json.errcode !== 0)) {
    throw new Error(
      `${apiName} 失败：HTTP ${res.status} errcode=${json?.errcode} ${json?.errmsg ?? ""}`.trim(),
    )
  }
  return json ?? {}
}

async function fetchReading() {
  const shelf = await call("/shelf/sync")

  const candidates = (shelf.books ?? [])
    // 私密阅读（secret=1）不要发到公开网站上
    .filter((book) => book.secret !== 1)
    // readUpdateTime 为 0 表示从没打开过，不算「在读」
    .filter((book) => Number(book.readUpdateTime) > 0)
    .sort((a, b) => Number(b.readUpdateTime) - Number(a.readUpdateTime))
    .slice(0, TOP_N)

  if (candidates.length === 0) {
    return { books: [], note: "书架里没有可展示的阅读记录" }
  }

  const books = []
  for (const book of candidates) {
    const entry = {
      bookId: book.bookId,
      title: book.title ?? "",
      author: book.author ?? "",
      category: book.category ?? "",
      cover: book.cover ?? "",
      progress: null,
      finished: false,
      lastReadAt: new Date(Number(book.readUpdateTime) * 1000).toISOString(),
      deepLink: book.deepLink ?? "",
    }

    try {
      const detail = await call("/book/getprogress", { bookId: book.bookId })
      const reading = detail.book ?? {}
      if (typeof reading.progress === "number") {
        entry.progress = reading.progress
        // progress 是 0-100 的整数，只有正好 100 才算读完
        entry.finished = reading.progress === 100
      }
    } catch (error) {
      // 单本节失败不该让整次抓取挂掉，卡片退化成「不显示进度条」
      console.warn(`   ⚠️  ${book.title}：进度获取失败 — ${error.message}`)
    }

    books.push(entry)
    await sleep(DELAY_BETWEEN_CALLS_MS)
  }

  return { books }
}

async function main() {
  if (!apiKey) {
    throw new Error(
      "缺少 WEREAD_API_KEY。在项目根目录的 .env 里加一行 WEREAD_API_KEY=wrk-... ，" +
        "或直接 export 到环境变量。",
    )
  }

  const { books, note } = await fetchReading()
  if (note) console.warn(`⚠️  ${note}`)

  const payload = {
    updatedAt: new Date().toISOString(),
    source: "weread",
    books,
  }

  fs.mkdirSync(path.dirname(OUT_FILE), { recursive: true })
  fs.writeFileSync(OUT_FILE, `${JSON.stringify(payload, null, 2)}\n`)

  console.log(`✅ 写入 ${books.length} 本到 ${OUT_FILE}`)
  for (const book of books) {
    const progress = book.progress === null ? "  ?" : `${String(book.progress).padStart(3)}%`
    console.log(`   ${progress}  ${book.title}${book.finished ? "（已读完）" : ""}`)
  }
}

main().catch((error) => {
  if (SOFT && fs.existsSync(OUT_FILE)) {
    // 构建流程用这条路径：微信读书挂了 / key 过期 / 断网，都不该阻塞部署
    console.warn(`⚠️  抓取失败，继续用上一次的数据构建：${error.message}`)
    process.exit(0)
  }
  console.error(`❌ ${error.message}`)
  process.exit(1)
})