#!/usr/bin/env node

const fs = require('fs');
const path = require('path');
const cheerio = require('cheerio');
const {
  cleanImageUrl,
  generateImageName,
  toOutputBaseName,
  buildParseApiUrl,
  resolveImageUrl,
  getFileBaseNameFromUrl,
  listLocalCharacters,
  sleep,
} = require('./utils');

/**
 * @typedef {Object} WikiConfig
 * @property {string} name 站点标识，用于日志和 CLI 筛选
 * @property {string} [baseUrl] Fandom 站点地
 * @property {string} [url] 完整 parse API 地址（与 baseUrl + wikiTitle 二选一）
 * @property {string} [wikiTitle] Wiki 页面标题
 * @property {string} savePath 图片保存目录
 * @property {string} [scopeSelector] 限定搜索范围的容器选择器，如 table.fandom-table
 * @property {number} [scopeIndex=0] 当存在多个 scope 时，取第几个（从 0 开始）
 * @property {string} imageSelector 图片 CSS 选择器（相对于 scope 或整页）
 * @property {string} [imageUrlAttr='src'] 图片 URL 所在属性，如 src、data-src
 * @property {(name: string) => string} [nameTransform] 文件名二次处理
 * @property {number} [downloadDelayMs] 下载间隔，默认 500ms
 * @property {string} [verifyApiUrl] 摄影集页面 API，配置后自动验证服务器已录入角色
 */

/** @type {WikiConfig[]} */
const wikiConfigs = [
  {
    name: 'genshin',
    baseUrl: 'https://genshin-impact.fandom.com',
    wikiTitle: 'Character/List',
    savePath: path.join(__dirname, 'output', 'genshin'),
    scopeSelector: 'table.fandom-table',
    scopeIndex: 0,
    imageSelector: 'td:first-child img[data-relevant="1"]',
    imageUrlAttr: 'data-src',
    nameTransform: (name) => name.replace(/-icon$/, ''),
    verifyApiUrl: 'https://paul.ren/api/page/get?slug=photo-collection-genshin',
  },
  {
    name: 'sr',
    baseUrl: 'https://honkai-star-rail.fandom.com',
    wikiTitle: 'Character/List',
    savePath: path.join(__dirname, 'output', 'sr'),
    scopeSelector: 'table.article-table',
    scopeIndex: 0,
    imageSelector: 'td:first-child img[data-relevant="1"]',
    imageUrlAttr: 'data-src',
    nameTransform: (name) => name.replace(/character-/, '').replace(/-icon$/, ''),
    verifyApiUrl: 'https://paul.ren/api/page/get?slug=photo-collection-sr',
  },
  {
    name: 'zzz',
    baseUrl: 'https://zenless-zone-zero.fandom.com',
    wikiTitle: 'Agent/List',
    savePath: path.join(__dirname, 'output', 'zzz'),
    scopeSelector: 'table.article-table',
    scopeIndex: 0,
    imageSelector: 'td:first-child img[data-relevant="1"]',
    imageUrlAttr: 'src',
    nameTransform: (name) => name.replace(/agent-/, '').replace(/-icon$/, ''),
    verifyApiUrl: 'https://paul.ren/api/page/get?slug=photo-collection-zzz',
  },
  {
    name: 'nte',
    baseUrl: 'https://neverness-to-everness.fandom.com/wiki/Character/List',
    url: 'https://neverness-to-everness.fandom.com/api.php?action=parse&page=Character/List&prop=text&format=json',
    wikiTitle: 'Character/List',
    savePath: path.join(__dirname, 'output', 'nte'),
    imageSelector: 'table.fandom-table img[data-relevant="1"]',
    imageUrlAttr: 'data-src',
    nameTransform: (name) => name.replace(/-icon$/, ''),
    verifyApiUrl: 'https://paul.ren/api/page/get?slug=photo-collection-nte',
  },
  {
    name: 'ww',
    baseUrl: 'https://wutheringwaves.fandom.com',
    wikiTitle: 'Resonator/List',
    savePath: path.join(__dirname, 'output', 'wuthering-waves'),
    imageSelector: 'table.article-table img[data-relevant="1"]',
    nameTransform: (name) => name.replace(/^resonator-/, ''),
    verifyApiUrl: 'https://paul.ren/api/page/get?slug=photo-collection-ww',
  },
  // {
  //   name: 'blue-archive',
  //   baseUrl: 'https://bluearchive.fandom.com',
  //   wikiTitle: 'Category:Students',
  //   savePath: path.join(__dirname, 'output', 'blue-archive'),
  //   imageSelector: 'table.article-table td:first-child img',
  //   nameTransform: (name) => name.replace(/-icon$/, ''),
  // },
];

function resolveApiUrl(config) {
  if (config.url) {
    return config.url;
  }
  if (config.baseUrl && config.wikiTitle) {
    return buildParseApiUrl(config.baseUrl, config.wikiTitle);
  }
  throw new Error(`[${config.name}] 需要提供 url，或同时提供 baseUrl 与 wikiTitle`);
}

async function fetchWikiHtml(config) {
  const apiUrl = resolveApiUrl(config);
  console.log('apiUrl', apiUrl);

  const response = await fetch(apiUrl, {
    headers: {
      'user-agent': 'Mozilla/5.0 (compatible; download-character-img/1.0)',
      accept: 'application/json',
    },
  });

  if (!response.ok) {
    throw new Error(`[${config.name}] 请求失败 ${response.status}: ${apiUrl}`);
  }

  const data = await response.json();
  const html = data?.parse?.text?.['*'];

  if (!html) {
    throw new Error(`[${config.name}] API 响应中未找到页面 HTML`);
  }

  return html;
}

function extractImages(html, config) {
  const {
    imageSelector,
    imageUrlAttr = 'src',
    scopeSelector,
    scopeIndex = 0,
  } = config;
  const $ = cheerio.load(html);
  const $container = scopeSelector
    ? $(scopeSelector).eq(scopeIndex)
    : null;

  if (scopeSelector && $container.length === 0) {
    return [];
  }

  const $images = $container ? $container.find(imageSelector) : $(imageSelector);
  const results = [];
  const seenNames = new Set();

  console.log('表格搜索数量：', $images.length);

  $images.each((_, element) => {
    const $img = $(element);
    const rawUrl = resolveImageUrl($img, imageUrlAttr);

    if (!rawUrl) {
      return;
    }

    const cleanedUrl = cleanImageUrl(rawUrl);
    const rawName = generateImageName(cleanedUrl);
    console.log('rawName', rawName);

    if (!rawName || seenNames.has(rawName)) {
      return;
    }

    seenNames.add(rawName);
    results.push({ url: cleanedUrl, rawName });
  });

  console.log('已去重结果数量：', results.length);

  return results;
}

async function downloadImage(url, filePath) {
  const response = await fetch(url, {
    headers: {
      accept: 'image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8',
      'user-agent': 'Mozilla/5.0 (compatible; download-character-img/1.0)',
    },
  });

  if (!response.ok) {
    throw new Error(`HTTP ${response.status}`);
  }

  const buffer = Buffer.from(await response.arrayBuffer());
  fs.writeFileSync(filePath, buffer);
}

async function downloadWiki(config) {
  const delay = config.downloadDelayMs ?? 500;
  const nameTransform = config.nameTransform ?? ((name) => name);

  console.log(`\n=== ${config.name} ===`);
  console.log(`保存目录: ${config.savePath}`);

  fs.mkdirSync(config.savePath, { recursive: true });

  const html = await fetchWikiHtml(config);
  const images = extractImages(html, config);

  console.log(`共找到 ${images.length} 张角色图`);

  let downloaded = 0;
  let skipped = 0;
  let failed = 0;

  for (const [index, image] of images.entries()) {
    const baseName = toOutputBaseName(image.rawName, nameTransform);
    const fileName = `${baseName}.webp`;
    const filePath = path.join(config.savePath, fileName);

    if (fs.existsSync(filePath)) {
      console.log(
        `[${index + 1}/${images.length}] 跳过: ${fileName} 已存在（本地已有，原站可能有更新）`
      );
      skipped += 1;
      continue;
    }

    console.log(`[${index + 1}/${images.length}] 下载: ${fileName}`);
    console.log(`  来源: ${image.url}`);

    try {
      await downloadImage(image.url, filePath);
      downloaded += 1;
    } catch (error) {
      console.error(`  失败: ${error.message}`);
      failed += 1;
    }

    if (index < images.length - 1) {
      await sleep(delay);
    }
  }

  console.log(
    `完成: 下载 ${downloaded}，跳过 ${skipped}，失败 ${failed}`
  );
}

async function fetchServerCharacters(verifyApiUrl) {
  const response = await fetch(verifyApiUrl, {
    headers: {
      'user-agent': 'Mozilla/5.0 (compatible; download-character-img/1.0)',
      accept: 'application/json',
    },
  });

  if (!response.ok) {
    throw new Error(`验证 API 请求失败 ${response.status}: ${verifyApiUrl}`);
  }

  const res = await response.json();
  const content = JSON.parse(res.data.content);
  const components = content.filter((item) => item.type === 'component');
  const ids = new Set();

  for (const component of components) {
    for (const item of component.props?.items ?? []) {
      if (item.url) {
        ids.add(getFileBaseNameFromUrl(item.url));
      }
    }
  }

  return [...ids].sort();
}

async function verifyWiki(config) {
  console.log(`\n--- 验证 ${config.name} 服务器录入 ---`);

  const localCharacters = listLocalCharacters(config.savePath);
  const serverCharacters = await fetchServerCharacters(config.verifyApiUrl);
  const serverSet = new Set(serverCharacters);
  const missingOnServer = localCharacters.filter((id) => !serverSet.has(id));
  const extraOnServer = serverCharacters.filter(
    (id) => !localCharacters.includes(id)
  );

  console.log(`Wiki 角色数: ${localCharacters.length}`);
  console.log(`服务器已录入: ${serverCharacters.length}`);

  if (missingOnServer.length === 0) {
    console.log('服务器已包含全部 Wiki 角色');
  } else {
    console.log(`\n服务器缺少 ${missingOnServer.length} 个角色，请手动补充：`);
    for (const id of missingOnServer) {
      console.log(`  - ${id}`);
    }
  }

  if (extraOnServer.length > 0) {
    console.log(`\n服务器多余 ${extraOnServer.length} 个（Wiki 中未找到）：`);
    for (const id of extraOnServer) {
      console.log(`  - ${id}`);
    }
  }
}

async function main() {
  const args = process.argv.slice(2);
  const verifyOnly = args.includes('--verify');
  const target = args.find((arg) => !arg.startsWith('--'));
  const configs = target
    ? wikiConfigs.filter((config) => config.name === target)
    : wikiConfigs;

  if (target && configs.length === 0) {
    const available = wikiConfigs.map((config) => config.name).join(', ');
    console.error(`未找到站点 "${target}"，可用: ${available}`);
    process.exit(1);
  }

  for (const config of configs) {
    if (!verifyOnly) {
      await downloadWiki(config);
    }
    if (config.verifyApiUrl) {
      await verifyWiki(config);
    }
  }

  console.log('\n全部处理完成！');
}

main().catch((error) => {
  console.error(error.message);
  process.exit(1);
});