import puppeteer from 'puppeteer';
import fs from 'fs';
import mysql from 'mysql2/promise';

const config = JSON.parse(fs.readFileSync('./config.json'));

export default class Urq {
  constructor() {
    this.dbopts = {
      host:     'localhost',
      database: config.DB_NAME,
      user: config.DB_USER,
      password: config.DB_PASSWORD,
      port:     '3306',
    };
    this.forum_id = 2;// your first category
  };

  async get_user_id(username) {
    if (!username) {
      return false;
    }
    let user_id = -1;
    let [userrows, fields] = await this.db.execute(`
      SELECT \`user_id\` FROM \`${config.DB_PREFIX}users\`
      WHERE username_clean = ?;
    `,[
      username.toLowerCase()
    ]);
    if (userrows.length > 0) {
      user_id = userrows[0].user_id;
    } else {
      let temp;
      temp = await this.db.execute(`
        INSERT INTO \`${config.DB_PREFIX}users\`
        (
          \`username\`, \`username_clean\`, \`user_permissions\`,
          \`user_sig\`
        )
        VALUES(?, ?, ?, ?);`,[
          username,
          username.toLowerCase(),
          "",
          ""
        ]);
      user_id = temp.insertId;
    }
    return user_id;
  }
  async scrape() {
    this.db = await mysql.createConnection(this.dbopts);
    this.browser = await puppeteer.launch({
      "headless": true,
    });
    await this.db.execute(`
      CREATE TABLE IF NOT EXISTS \`${config.DB_PREFIX}bordathreads\` ( 
        \`id\` Int( 255 ) UNSIGNED AUTO_INCREMENT NOT NULL, 
        \`url\` Varchar(255) UNIQUE NOT NULL, 
        \`name\` Varchar(255) NOT NULL,
        PRIMARY KEY ( \`id\` )
      );`);
    try {
      let [threadrow, fields] = await this.db.execute(
        `SELECT COUNT(*) FROM \`${config.DB_PREFIX}posts\``
      );
    } catch (e) {
      console.error('Please install phpbb first.');
      await this.browser.close();
      return;
    }

    await this.scrape_pages();
    await this.scrape_threads();
    await this.browser.close();
  };

  async scrape_pages() {
    try {
      console.log("Scraping threads.");
      const page = await this.browser.newPage();
      let threads = [];
      for (let offset = 0; offset <= 400; offset += 20) {
        console.log("Offset "+offset);
        await page.goto("http://urq.borda.ru?0-0-"+offset, {
          "waitUntil" : "domcontentloaded"
        });

        let pagethreads = await page.evaluate(() => {
          try {
            let links = document.querySelectorAll(".font3 a");
            let href = [];
            for (let i = 0; i < links.length; i++) {
              let url = "http://urq.borda.ru"+links[i].getAttribute("href");
              url = url.replace("-000-0-0-", "-000-10001-0-");
              href.push({
                "url": url,
                "name": links[i].innerHTML,
              });
            }
            return href;
          } catch (e) {
            return [];
          }
        });
        console.log(pagethreads);
        for (let i = 0; i < pagethreads.length; i++) {
          threads.push(pagethreads[i]);
        }
      }

      console.log(threads);

      for (let i = 0; i < threads.length; i++) {
        try {
          let [threadrow, fields] = await this.db.execute(`
      SELECT \`id\` FROM \`${config.DB_PREFIX}bordathreads\`
      WHERE \`url\` = ?
      `,[
        threads[i].url,
      ]);
          if (threadrow.length === 0) {
            let [rows, fields] = await this.db.execute(`
            INSERT INTO ${config.DB_PREFIX}bordathreads (url, name) VALUES( ?, ? )
            `, [
              threads[i].url,
              threads[i].name,
            ]);
          }
        } catch(e) {
          console.log(e);
        }
      }

      await page.close();
    } catch(e) {
      console.log(e);
    }
  };

  /**
   * Scrape all threads
   */
  async scrape_threads() {
    try {
      console.log("Scraping threads.");
      const page = await this.browser.newPage();
      page.on('console', msg => {
        for (let i = 0; i < msg.args().length; ++i)
          console.log(`${i}: ${msg.args()[i]}`);
      });
      let [rows, fields] = await this.db.execute(`
        SELECT * FROM \`${config.DB_PREFIX}bordathreads\`
        `);
      for (let i = 0; i < rows.length;i++) {
        await page.goto(rows[i].url, {
          "waitUntil" : "domcontentloaded"
        });
        let messages = await page.evaluate(() => {
          function intersect(a, b) {
            var t;
            // indexOf to loop over shorter
            if (b.length > a.length) t = b, b = a, a = t;
            return a.filter(function (e) {
              return b.indexOf(e) > -1;
            });
          }
          try {
            let rows = document.querySelectorAll("body > table > tbody > tr > td > table > tbody > tr > td > table > tbody > tr");
            let retval = [];
            for (let i = 0; i < rows.length; i++) {
              let msgclasses = ["mess1", "mess2", "mess3", "mess4"];
              let rowclasses = [];
              if(rows[i].getAttribute("class") !== null) {
                rowclasses = rows[i].getAttribute("class").split(" ");
              }
              if (
                rowclasses.length > 0 &&
                intersect(msgclasses, rowclasses) === []
              ) {
                continue;
              }
              let date = null;
              let author = rows[i].querySelector(".font3 a b");
              if (author) {
                author = author.innerHTML;
              }
              let content = rows[i].querySelector(".font1");
              if (content) {
                content = content.innerHTML;
              }
              if (!author && !content) {
                continue;
              }
              let meta = rows[i].querySelectorAll(".font2")[2];
              let title = '';
              if (meta) {
                meta = meta.innerHTML;
                date = meta.match(/\d\d\.\d\d\.\d\d\&nbsp\;\d\d\:\d\d/);
                [undefined, title] = meta.split("Заголовок: ");
                if (date) {
                  date = date[0];
                  let [days, time] = date.split("&nbsp;");
                  let [hour, minute] = time.split(":");
                  let [day,month,year] = days.split(".");
                  year = "20"+year;
                  date = new Date(year, month, day, hour, minute);
                  date = date.getTime() / 1000;
                }
              }
              let avatar = rows[i].querySelectorAll(".font2 img")[1];
              if (avatar) {
                avatar = avatar.getAttribute("src");
                if (avatar === "http://forum24.ru/gif/img/p.gif") {
                  avatar = null;
                }
              }
              retval.push({
                "author": author,
                "title": title,
                "content": content,
                "avatar": avatar,
                "date": date
              });
            }
            return retval;
          } catch (e) {
            console.log(e.message);
            return [];
          }
        });

        let user_id = undefined;
        let topic_id = undefined;
        while (user_id === undefined) {
          user_id = await this.get_user_id(messages[0].author);
        }
        if (user_id === false) {
          continue;
        }
        while(topic_id === undefined) {
          topic_id = await this.get_topic_id(user_id, messages[0].date, rows[i].name);
        }
        for (let j = 0; j < messages.length; j++) {
          if (messages[j].author == undefined ||
            messages[j].date == undefined ||
            messages[j].title == undefined ||
            messages[j].content == undefined
          ) {
            console.log("Skipped message");
            console.log(messages[j]);
            continue;
          }

          user_id = undefined;
          while (user_id === undefined) {
            user_id = await this.get_user_id(messages[j].author);
          }
          await this.insert_post(
            topic_id,
            user_id,
            messages[j].date,
            messages[j].title,
            messages[j].content
          );
        }
      }
    } catch(e) {
      console.log(e);
    }
  }
  async insert_post(topic_id, user_id, date, title, content) {
    let [userrows, fields] = await this.db.execute(`
      SELECT \`post_id\` FROM \`${config.DB_PREFIX}posts\`
      WHERE \`topic_id\` = ?
        AND \`poster_id\` = ?
        AND \`post_time\` = ?
        AND \`post_subject\` = ?;
      `,[
        topic_id,
        user_id,
        date,
        title
      ]);
    if (userrows.length === 0) {
      await this.db.execute(`
        INSERT INTO \`${config.DB_PREFIX}posts\`
        (
          \`topic_id\`, \`forum_id\`, \`poster_id\`,
          \`post_time\`, \`post_subject\`, \`post_text\`,
          \`post_visibility\`
        )
        VALUES(?, ?, ?, ?, ?, ?, ?);`,[
          topic_id,
          this.forum_id,
          user_id,
          date,
          title,
          content,
          "1"
        ]);
    }
  }

  async get_topic_id(user_id, date, topic_name) {
    user_id = parseInt(user_id);
    let [userrows, fields] = await this.db.execute(`
      SELECT \`topic_id\` FROM \`${config.DB_PREFIX}topics\`
      WHERE \`topic_title\` = ?
        AND \`topic_poster\` = ?;
      `,[
        topic_name, user_id
      ]);
    if (userrows.length > 0) {
      return userrows[0].topic_id;
    } else {
      let temp;
      temp = await this.db.execute(`
        INSERT INTO \`${config.DB_PREFIX}topics\`
        (\`forum_id\`, \`topic_poster\`, \`topic_time\`, \`topic_title\`,
        \`topic_visibility\`)
        VALUES(?, ?, ?, ?, ?);`,[
          this.forum_id,
          user_id,
          date,
          topic_name,
          "1"
        ]);
      return temp.insertId;
    }
  }

}