var express = require('express');
var router = express.Router();
const models = require('../models');
const config = require('../config/app');
const redis = require('../libs/redis');
const categories = require('../config/category');
const tags = require('../config/tag');
const languages = require('../config/language');
const translate = require('../config/translate');
const meta = require('../config/meta');
const utils = require('../libs/utils');
const { format } = require('date-fns');
const { getListBuilder } = require('../libs/pager');

const CACHE_PREFIX = "art_v1";
const CACHE_EXPIRES = 60; // 60s刷新一次

const artSelect = 'name title desc width height date publishTime tags lastMod mystery hasSpecial useSpecialThumb publishVersion lock pageId';


// 路由：设置语言
router.post('/set-lang', (req, res) => {
  const lang = req.body.lang;
  const uri = req.body.uri;

  // 设置cookie来保存用户选择的语言
  res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });

  // 重定向会指定的uri页，但是语言要变过来
  let newUri = `/${lang}${uri.substring(3)}`;
  res.redirect(newUri);
});


// 首页不带语言路由，确定lang，然后重定向到相关语言版本
router.get('/', (req, res, next) => {
  let locale = utils.lang.getLocale(req.acceptsLanguages());
  let lang = utils.lang.ensureLanguage(locale);
  // 如果cookies中带有lang，就用cookies的，cookies没有则设置cookies
  if (req.cookies.lang) {
    lang = utils.lang.ensureLanguage(req.cookies.lang);
  }
  if (!req.cookies.lang || req.cookies.lang != lang) {
    res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
  }
  return res.redirect(`/${lang}`);
});


// 首页路由
router.get('/:lang/', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let baseSort = { publishTime: 'desc' };

    // 最新上线
    let latest = await models.Art
      .find({ status: 9000 })
      .select(artSelect)
      .sort(baseSort)
      .limit(12)
      .lean()
      .exec();
    organizeData(latest, lang);

    // 热门精选
    let recommend = await models.Art
      .find({ tags: 'data_good', status: 9000 })
      .select(artSelect)
      .sort(baseSort)
      .limit(12)
      .lean()
      .exec();
    organizeData(recommend, lang);

    // special 专区
    let special = await models.Art
      .find({ hasSpecial: true, status: 9000 })
      .select(artSelect)
      .sort(baseSort)
      .limit(12)
      .lean()
      .exec();
    organizeData(special, lang);

    // 专辑
    let albums = await models.ArtAlbum
      .find({ pid: 'art', enabled: true })
      .sort({ order: 'asc' })
      .populate('title')
      .populate('slogon')
      .select('tag title slogon contents')
      .limit(6)
      .lean()
      .exec();


    for (let doc of albums) {
      doc.icon = `${config.resHost}/res/coloring/album_icon/320/${doc._id}.jpeg`;
      doc.cover = `${config.resHost}/res/coloring/album_cover/320/${doc._id}.jpeg`;
      doc.title = doc.title ? doc.title[lang] : '';
      doc.slogon = doc.slogon ? doc.slogon[lang] : '';
      doc.size = doc.contents.length;
    }

    // 设计师
    let designers = await models.Art.aggregate([
      // 首先，过滤出 status = 9000 的文档
      { $match: { status: 9000 } },

      // 首先，根据 user 字段进行分组，并计算每个 user 出现的次数
      { $group: { _id: '$user', count: { $sum: 1 } } },

      // 然后，按照 count 字段进行降序排列
      { $sort: { count: -1 } },

      // 接着，与 users 集合进行连接，以获取用户的详细信息
      {
        $lookup: {
          from: 'users', // 要连接的集合名称
          localField: '_id', // 本地字段（即上一步分组后的 _id 字段）
          foreignField: '_id', // 要连接的集合中的字段
          as: 'userDetails' // 连接后结果存储在新字段 userDetails 中
        }
      },

      // 展开 userDetails 数组，以便将用户信息提升到顶层
      { $unwind: '$userDetails' },

      // 调整输出格式，只保留需要的字段
      { $project: { _id: 1, user: '$_id', count: 1, username: '$userDetails.username', name: '$userDetails.name' } },

      // 限制返回的记录数量
      { $limit: 6 }
    ]);

    for (let doc of designers) {
      doc.avatar = `/thumbs/v1/avatar/320/${doc._id}.jpeg`;
    }


    let data = {
      title: meta.homePageTile[lang],
      description: meta.homePageDescription[lang],
      latest,
      recommend,
      special,
      albums,
      designers,
      translate,
      categories,
      languages,
      lang,
      tags,
      uri: `/${lang}`,
    };

    res.render('index', data);
  })().catch(next);
});


// 分类页路由
router.get('/:lang/category/:tag?', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let tag = req.params.tag;
    if (!tag) tag = 'latest';

    let query = {
      page: req.query.page,
      length: req.query.length,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: tag == 'latest' ? {} : { tags: tag },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);

    let data = {
      title: meta.categoryTitle[lang],
      description: meta.categoryDescription[lang],
      data: result.data,
      page: result.page,
      search: req.query.search,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      categories,
      languages,
      lang,
      tag,
      uri: `/${lang}/category/${tag}`,
    };

    res.render('category', data);
  })().catch(next);

});

// 标签页路由
router.get('/:lang/tag/:tag?', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let tag = req.params.tag;
    if (!tag) tag = 'latest';

    let query = {
      page: req.query.page,
      length: req.query.length,
      search: req.query.search,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: tag == 'latest' ? {} : { tags: tag },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);

    let data = {
      title: meta.tagTitle[lang],
      description: meta.tagDescription[lang],
      data: result.data,
      page: result.page,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      categories,
      languages,
      lang,
      tag,
      tags,
      uri: `/${lang}/tag/${tag}`,
    };

    res.render('tag', data);

  })().catch(next);

});


// 搜索页路由
router.get('/:lang/search', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let search = req.query.search;


    let query = {
      page: req.query.page,
      length: req.query.length,
      search: req.query.search,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: {},
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);

    let data = {
      title: meta.searchTitle[lang],
      description: meta.searchDescription[lang],
      data: result.data,
      page: result.page,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      categories,
      languages,
      lang,
      uri: `/${lang}/search?search=${search}`,
    };

    res.render('search', data);
  })().catch(next);

});


// special页路由
router.get('/:lang/special', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let query = {
      title: meta.specialTitle[lang],
      description: meta.specialDescription[lang],
      lang,
      page: req.query.page,
      length: req.query.length,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: { hasSpecial: true },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);

    let data = {
      title: meta.specialTitle[lang],
      description: meta.specialDescription[lang],
      data: result.data,
      page: result.page,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      languages,
      lang,
      uri: `/${lang}/special`,
    };

    res.render('special', data);

  })().catch(next);

});

// 专辑页路由
router.get('/:lang/albums', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    // 专辑
    let albums = await models.ArtAlbum
      .find({ pid: 'art', enabled: true })
      .sort({ order: 'asc' })
      .populate('title')
      .populate('slogon')
      .select('tag title slogon contents')
      .lean()
      .exec();


    for (let doc of albums) {
      doc.icon = `${config.resHost}/res/coloring/album_icon/320/${doc._id}.jpeg`;
      doc.cover = `${config.resHost}/res/coloring/album_cover/640/${doc._id}.jpeg`;
      doc.title = doc.title ? doc.title[lang] : '';
      doc.slogon = doc.slogon ? doc.slogon[lang] : '';
      doc.size = doc.contents.length;
    }

    let data = {
      title: meta.albumsTitle[lang],
      description: meta.albumsDescription[lang],
      data: albums,
      length: albums.length,
      translate,
      languages,
      lang,
      uri: `/${lang}/albums`,
    };

    res.render('albums', data);

  })().catch(next);

});

// 专辑详情页路由
router.get('/:lang/album/:id', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let id = req.params.id;
    utils.validators.validateId(id);

    // 专辑
    let doc = await models.ArtAlbum
      .findById(id)
      .populate('title')
      .populate('slogon')
      .populate({ path: 'contents', select: artSelect })
      .select('tag title slogon contents')
      .lean()
      .exec();

    if (!doc) throw createError(404, 'Album Not Found!');

    doc.icon = `${config.resHost}/res/coloring/album_icon/320/${doc._id}.jpeg`;
    doc.cover = `${config.resHost}/res/coloring/album_cover/640/${doc._id}.jpeg`;
    doc.title = doc.title ? doc.title[lang] : '';
    doc.slogon = doc.slogon ? doc.slogon[lang] : '';
    doc.size = doc.contents.length;

    organizeData(doc.contents, lang);


    let data = {
      title: `${doc.title} | ${translate.coloringPageAlbum[lang]}`,
      description: `${doc.slogon} | ${translate.coloringPageAlbum[lang]}`,
      data: doc,
      translate,
      languages,
      lang,
      uri: `/${lang}/album/${id}`,
    };

    res.render('album', data);
  })().catch(next);

});


// 设计师专栏路由
router.get('/:lang/designers', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let docs = await models.Art.aggregate([
      // 首先，过滤出 status = 9000 的文档
      { $match: { status: 9000 } },

      // 首先，根据 user 字段进行分组，并计算每个 user 出现的次数
      { $group: { _id: '$user', count: { $sum: 1 } } },

      // 然后，按照 count 字段进行降序排列
      { $sort: { count: -1 } },

      // 接着，与 users 集合进行连接，以获取用户的详细信息
      {
        $lookup: {
          from: 'users', // 要连接的集合名称
          localField: '_id', // 本地字段（即上一步分组后的 _id 字段）
          foreignField: '_id', // 要连接的集合中的字段
          as: 'userDetails' // 连接后结果存储在新字段 userDetails 中
        }
      },

      // 展开 userDetails 数组，以便将用户信息提升到顶层
      { $unwind: '$userDetails' },

      // 调整输出格式，只保留需要的字段
      { $project: { _id: 1, user: '$_id', count: 1, username: '$userDetails.username', name: '$userDetails.name' } },

      // 限制返回的记录数量
      { $limit: 40 }
    ]);



    for (let doc of docs) {
      doc.avatar = `/thumbs/v1/avatar/320/${doc._id}.jpeg`;
    }

    let data = {
      title: meta.designersTitle[lang],
      description: meta.designersDescription[lang],
      data: docs,
      length: docs.length,
      translate,
      languages,
      lang,
      uri: `/${lang}/designers`,
    };

    res.render('designers', data);

  })().catch(next);

});


// 设计师详情页路由
router.get('/:lang/designer/:id', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let id = req.params.id;
    utils.validators.validateId(id);

    let user = await models.User.findById(id).select('name username');
    if (!user) throw createError(404, 'User Not Found!');
    let count = await models.Art.countDocuments({ user: id, status: 9000 });
    user.count = count;
    user.avatar = `/thumbs/v1/avatar/320/${user._id}.jpeg`;


    // find user arts
    // 算法： 排除掉主流的tag，用剩下的tag去检索，取最多12条记录
    let query = {
      page: req.query.page,
      length: req.query.length,
      search: req.query.search,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: { user: id },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);


    let data = {
      title: `${meta.designerTitle[lang]}: ${user.username}`,
      description: meta.designerDescription[lang],
      user,
      data: result.data,
      page: result.page,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      lang,
      languages,
      uri: `/${lang}/designer/${id}`,
    };

    res.render('designer', data);

  })().catch(next);

});





function getRealId(str) {
  let id = str;
  let lastIndex = str.lastIndexOf('-');
  if (lastIndex !== -1) {
    id = str.substring(lastIndex + 1);
  }
  return id;
}

// 详情页路由（seo url）
router.get('/:lang/coloring-page/:str', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let str = req.params.str;  // 拟人化的id，形如 beautiful-house-daldkaghlda3232, 最后一个-后面的才是真正的id
    let id = getRealId(str);


    utils.validators.validateId(id);

    let doc = await models.Art
      .findById(id)
      .select(artSelect)
      .populate('user', 'username name')
      .lean()
      .exec();
    if (!doc) throw createError(404, 'Art Not Found!');

    organizeDetail(doc, lang);

    // find relate
    let tags = [...doc.tags];
    let cates = categories.map(e => e.id);
    tags = tags.filter(e => !cates.includes(e));

    let query = {
      page: req.query.page,
      length: req.query.length,
      search: req.query.search,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: { tags },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);


    let data = {
      // title: `${doc.name.replace(/[_]+/g, '-')}`,
      title: `${doc.title} ${translate.printableColoringPage[lang]}`,
      description: `${doc.desc}`,
      // description: `${meta.detailDescription[lang]}: ${doc.desc}`,
      detail: doc,
      data: result.data,
      page: result.page,
      length: result.length,
      recordsFiltered: result.recordsFiltered,
      recordsTotal: result.recordsTotal,
      translate,
      lang,
      languages,
      relates: result.data,
      uri: doc.uri,
    };

    res.render('detail', data);
  })().catch(next);

});

// 详情页路由（简单版不带seo）
router.get('/:lang/detail/:id', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    if (!req.cookies.lang || req.cookies.lang != lang) {
      res.cookie('lang', lang, { maxAge: 900000, httpOnly: true });
    }

    let id = req.params.id;

    utils.validators.validateId(id);

    let doc = await models.Art
      .findById(id)
      .select(artSelect)
      .populate('user', 'username name')
      .lean()
      .exec();
    if (!doc) throw createError(404, 'Art Not Found!');

    organizeDetail(doc, lang);

    // find relate
    let tags = [...doc.tags];
    let cates = categories.map(e => e.id);
    tags = tags.filter(e => !cates.includes(e));

    let query = {
      page: req.query.page,
      length: req.query.length,
      search: req.query.search,
      orderBy: 'publishTime',
      order: 'desc',
      base: { status: 9000 },
      filters: { tags },
    }

    let result = await getListBuilder(query, models.Art);
    organizeData(result.data, lang);

    let data = {
      // title: `${doc.name.replace(/[_]+/g, '-')}`,
      title: `${doc.title} ${translate.printableColoringPage[lang]}`,
      description: `${doc.desc}`,
      // description: `${meta.detailDescription[lang]}: ${doc.desc}`,
      data: doc,
      translate,
      lang,
      languages,
      relates,
      uri: `${lang}/detail/${id}`,
    };

    res.render('detail', data);
  })().catch(next);

});


// play页路由
router.get('/play/:id', function (req, res, next) {
  (async function () {
    let id = req.params.id;
    let data = {
      id,
      title: meta.playTitle.en,
      description: meta.playDescription.en,
    };

    utils.validators.validateId(id);
    let doc = await models.Art.findById(id);
    if (!doc) throw createError(404, 'Art Not Found!');

    res.render('play', data);

  })().catch(next);

});

// print页路由
router.get('/print/:id', function (req, res, next) {
  (async function () {
    let id = req.params.id;
    let data = {
      id,
      title: meta.playTitle.en,
      description: meta.playDescription.en,
    };

    utils.validators.validateId(id);
    let doc = await models.Art.findById(id);
    if (!doc) throw createError(404, 'Art Not Found!');

    let host = config.resHost;
    let size = Math.min(doc.width, 2000);
    let downlink = `${host}/thumbs/coloring-page/page/${size}/${doc._id}.jpeg`;

    data.downlink = downlink;

    res.render('print', data);

  })().catch(next);

});



router.get('/:lang/info', function (req, res, next) {
  (async function () {
    let lang = utils.lang.ensureLanguage(req.params.lang);
    let data = {
      title: meta.infoTitle[lang],
      description: meta.infoDescription[lang],
      lang,
      languages,
      translate,
      uri: `/${lang}/info`,
    };

    res.render('info', data);
  })().catch(next);

});


const organizeData = (data, lang) => {
  data.forEach(doc => {
    let host = config.resHost;
    let publishVersion = doc.publishVersion || 0;
    let version = publishVersion + 1500;

    doc.thumb = `${host}/thumbs/coloring-page/page/480/${doc._id}.jpeg`;
    if (doc.mystery) { // 神秘图固定用一张
      doc.thumb = `${host}/thumbs/coloring-page/mystery/480/${doc._id}.jpeg`;
    } else if (doc.hasSpecial) { // special图有切线图、渐变切线图、灰度图、上传图3中可选
      let str = 'special_outline';
      if (doc.useSpecialThumb == 1) {
        str = 'special_gray';
      } else if (doc.useSpecialThumb == 2) {
        str = 'special_thumb';
      } else if (doc.useSpecialThumb == 3) {
        str = 'special_gradient';
      }
      doc.thumb = `${host}/thumbs/coloring-page/${str}/480/${doc._id}.jpeg`;
    }

    doc.zip = `${host}/zips/v2/number_mini/${version}/${doc._id}.zip`;

    if (doc.title) {
      try {
        let titleJson = JSON.parse(doc.title);
        doc.title = titleJson && titleJson[lang] ? titleJson[lang] : doc.name;
      } catch (e) {
        console.error(e.message);
      }
    } else {
      doc.title = doc.name;
    }

    let utf8name = encodeURIComponent(doc.title.replace(/[\s_]+/g, '-')).toLowerCase();
    doc.uri = `/${lang}/coloring-page/${utf8name}-${doc._id}`;

    delete doc.hasSpecial;
    delete doc.useSpecialThumb;
    delete doc.publishVersion;
    delete doc.pageId;
    delete doc.desc;
  })
}


const organizeDetail = (doc, lang) => {
  let host = config.resHost;
  let publishVersion = doc.publishVersion || 0;
  let version = publishVersion + 1500;

  doc.thumb = `${host}/thumbs/coloring-page/page/480/${doc._id}.jpeg`;
  if (doc.mystery) { // 神秘图固定用一张
    doc.thumb = `${host}/thumbs/coloring-page/mystery/480/${doc._id}.jpeg`;
  } else if (doc.hasSpecial) { // special图有切线图、渐变切线图、灰度图、上传图3中可选
    let str = 'special_outline';
    if (doc.useSpecialThumb == 1) {
      str = 'special_gray';
    } else if (doc.useSpecialThumb == 2) {
      str = 'special_thumb';
    } else if (doc.useSpecialThumb == 3) {
      str = 'special_gradient';
    }
    doc.thumb = `${host}/thumbs/coloring-page/${str}/480/${doc._id}.jpeg`;
  }

  doc.zip = `${host}/zips/v2/number_mini/${version}/${doc._id}.zip`

  // doc.title = translate.titleTest[lang];
  // doc.desc = translate.descTest[lang];
  if (doc.title) {
    try {
      let titleJson = JSON.parse(doc.title);
      doc.title = titleJson && titleJson[lang] ? titleJson[lang] : doc.name;
    } catch (e) {
      console.error(e.message);
    }
  } else {
    doc.title = doc.name;
  }
  if (doc.desc) {
    try {
      let descJson = JSON.parse(doc.desc);
      doc.desc = descJson && descJson[lang] ? descJson[lang] : '';
    } catch (e) {
      console.error(e.message);
    }
  }
  doc.publishTime = format(new Date(doc.publishTime), 'yyyy/MM/dd');

  let utf8name = encodeURIComponent(doc.title.replace(/[\s_]+/g, '-')).toLowerCase();
  doc.uri = `/${lang}/coloring-page/${utf8name}-${doc._id}`;

  let size = Math.min(doc.width, 2000);
  doc.downlink = `${host}/thumbs/coloring-page/page/${size}/${doc._id}.jpeg`;

  delete doc.hasSpecial;
  delete doc.useSpecialThumb;
  delete doc.publishVersion;
  delete doc.pageId;

}



module.exports = router;