var express = require('express');
var router = express.Router();
const redis = require('../../libs/redis');
const models = require('../../models');
const utils = require('../../libs/utils');
const common = require('./common');
const config = require('../../config/app');

const CACHE_PREFIX = "art_v2";
// const CACHE_EXPIRES = 60; // 60s刷新一次
const CACHE_EXPIRES = 600;

const artSelect = 'name title desc seoTitle seoDescription width height date publishTime tags lastMod mystery hasSpecial useSpecialThumb publishVersion totalStartCount totalDoneCount completionRate';


// 所有专辑页路由
router.get('/', function (req, res, next) {
  (async function () {
    let cacheKey = `${CACHE_PREFIX}_albums`;
    let htmlData = await redis.getAsync(cacheKey);
    // htmlData = null;
    if (!htmlData) {
      // 专辑
      let albums = await models.ArtAlbum
        .find({ pid: 'art', enabled: true })
        .sort({ order: 'asc' })
        .populate('title')
        .populate('slogon')
        .select('tag title slogon seoTitle seoDescription contents')
        .lean()
        .exec();

      let host = config.cdnHost ?? config.resHost;
      for (let doc of albums) {
        doc.icon = `${host}/thumbs/coloring-page/album_icon/320/${doc._id}.webp`;
        doc.cover = `${host}/thumbs/coloring-page/album_cover/480/${doc._id}.webp`;
        doc.title = doc.title ? doc.title['en'] : '';
        doc.slogon = doc.slogon ? doc.slogon['en'] : '';
        doc.size = doc.contents.length;
        if (doc.seoTitle) {
          try {
            let titleJson = JSON.parse(doc.seoTitle);
            doc.seoTitle = titleJson && titleJson['en'] ? titleJson['en'] : doc.title;
          } catch (e) {
            console.error(e.message);
          }
        } else {
          doc.seoTitle = doc.title;
        }
        if (doc.seoDescription) {
          try {
            let descJson = JSON.parse(doc.seoDescription);
            doc.seoDescription = descJson && descJson['en'] ? descJson['en'] : doc.slogon;
          } catch (e) {
            console.error(e.message);
          }
        } else {
          doc.seoDescription = doc.slogon;
        }
      }

      let data = {
        data: albums,
        length: albums.length,
        uri: req.originalUrl,
      };

      // 渲染EJS模板到内存中
      res.render('v2/albums', data, async (err, html) => {
        if (err) {
          // 如果渲染出错，调用next()传递错误
          return next(err);
        }

        // 渲染成功，存redis, 发送数据到客户端
        htmlData = html;
        try {
          await redis.set(cacheKey, htmlData, 'EX', CACHE_EXPIRES);
        } catch (e) {
          console.error(e);
        }

        res.send(htmlData);
      });
    } else {
      // 缓存命中， 直接发送缓存数据
      res.set({ 'X-From-Cache': 'true' });
      res.send(htmlData);
    }

  })().catch(next);

});


// 专辑详情页路由
router.get('/:id', function (req, res, next) {
  (async function () {
    let id = req.params.id;
    utils.validators.validateId(id);

    let cacheKey = `${CACHE_PREFIX}_album_${id}`;
    let htmlData = await redis.getAsync(cacheKey);
    htmlData = null;
    if (!htmlData) {
      // 专辑
      let doc = await models.ArtAlbum
        .findById(id)
        .populate('title')
        .populate('slogon')
        .populate({ path: 'contents', select: artSelect, populate: { path: 'user', select: 'username name' } })
        .select('tag title slogon seoTitle seoDescription contents timeCreate')
        .lean()
        .exec();

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

      let host = config.cdnHost ?? config.resHost;
      doc.icon = `${host}/thumbs/coloring-page/album_icon/320/${doc._id}.webp`;
      doc.cover = `${host}/thumbs/coloring-page/album_cover/480/${doc._id}.webp`;
      doc.timeCreate = common.dateFormat(doc.timeCreate);
      doc.title = doc.title ? doc.title['en'] : '';
      doc.slogon = doc.slogon ? doc.slogon['en'] : '';
      doc.size = doc.contents.length;
      if (doc.seoTitle) {
        try {
          let titleJson = JSON.parse(doc.seoTitle);
          doc.seoTitle = titleJson && titleJson['en'] ? titleJson['en'] : doc.title;
        } catch (e) {
          console.error(e.message);
        }
      } else {
        doc.seoTitle = doc.title;
      }
      if (doc.seoDescription) {
        try {
          let descJson = JSON.parse(doc.seoDescription);
          doc.seoDescription = descJson && descJson['en'] ? descJson['en'] : doc.slogon;
        } catch (e) {
          console.error(e.message);
        }
      } else {
        doc.seoDescription = doc.slogon;
      }

      common.organizeData(doc.contents);

      const comments = await models.Comment.find({ approved: true, page: id }).sort({ createdAt: -1 });

      // deeplink 相关
      let applink = `https://art.pcoloring.com${req.originalUrl}`;
      let downlink = `https://art.pcoloring.com/app`;

      let data = {
        title: doc.seoTitle,
        description: doc.seoDescription,
        data: doc,
        uri: req.originalUrl,
        pageId: id,
        comments,
        applink,
        downlink,
      };
      // 渲染EJS模板到内存中
      res.render('v2/album', data, async (err, html) => {
        if (err) {
          // 如果渲染出错，调用next()传递错误
          return next(err);
        }

        // 渲染成功，存redis, 发送数据到客户端
        htmlData = html;
        try {
          await redis.set(cacheKey, htmlData, 'EX', CACHE_EXPIRES);
        } catch (e) {
          console.error(e);
        }

        res.send(htmlData);
      });
    } else {
      // 缓存命中， 直接发送缓存数据
      res.set({ 'X-From-Cache': 'true' });
      res.send(htmlData);
    }

  })().catch(next);

});


module.exports = router;