import type { NextApiRequest, NextApiResponse } from 'next';
import { Op } from 'sequelize';
import db from '../../database/database';
import Keyword from '../../database/models/keyword';
import { refreshAndUpdateKeywords } from './refresh';
import { getAppSettings } from './settings';
import verifyUser from '../../utils/verifyUser';
import parseKeywords from '../../utils/parseKeywords';

type KeywordsGetResponse = {
   keywords?: KeywordType[],
   error?: string|null,
}

type KeywordsDeleteRes = {
   domainRemoved?: number,
   keywordsRemoved?: number,
   error?: string|null,
}

export default async function handler(req: NextApiRequest, res: NextApiResponse) {
   await db.sync();
   const authorized = verifyUser(req, res);
   if (authorized !== 'authorized') {
      return res.status(401).json({ error: authorized });
   }

   if (req.method === 'GET') {
      return getKeywords(req, res);
   }
   if (req.method === 'POST') {
      return addKeywords(req, res);
   }
   if (req.method === 'DELETE') {
      return deleteKeywords(req, res);
   }
   if (req.method === 'PUT') {
      return updateKeywords(req, res);
   }
   return res.status(502).json({ error: 'Unrecognized Route.' });
}

const getKeywords = async (req: NextApiRequest, res: NextApiResponse<KeywordsGetResponse>) => {
   if (!req.query.domain && typeof req.query.domain !== 'string') {
      return res.status(400).json({ error: 'Domain is Required!' });
   }
   const domain = (req.query.domain as string).replaceAll('-', '.').replaceAll('_', '-');

   try {
      const allKeywords:Keyword[] = await Keyword.findAll({ where: { domain } });
      const keywords: KeywordType[] = parseKeywords(allKeywords.map((e) => e.get({ plain: true })));
      const slimKeywords = keywords.map((keyword) => {
         const historyArray = Object.keys(keyword.history).map((dateKey:string) => ({
            date: new Date(dateKey).getTime(),
            dateRaw: dateKey,
            position: keyword.history[dateKey],
         }));
         const historySorted = historyArray.sort((a, b) => a.date - b.date);
         const lastWeekHistory :KeywordHistory = {};
         historySorted.slice(-7).forEach((x:any) => { lastWeekHistory[x.dateRaw] = x.position; });
         return { ...keyword, lastResult: [], history: lastWeekHistory };
      });
      console.log('getKeywords: ', keywords.length);
      return res.status(200).json({ keywords: slimKeywords });
   } catch (error) {
      console.log(error);
      return res.status(400).json({ error: 'Error Loading Keywords for this Domain.' });
   }
};

const addKeywords = async (req: NextApiRequest, res: NextApiResponse<KeywordsGetResponse>) => {
   const { keywords, device, country, domain, tags } = req.body;
   if (keywords && device && country) {
      const keywordsArray = keywords.replaceAll('\n', ',').split(',').map((item:string) => item.trim());
      const tagsArray = tags ? tags.split(',').map((item:string) => item.trim()) : [];
      const keywordsToAdd: any = []; // QuickFIX for bug: https://github.com/sequelize/sequelize-typescript/issues/936

      keywordsArray.forEach((keyword: string) => {
         const newKeyword = {
            keyword,
            device,
            domain,
            country,
            position: 0,
            updating: true,
            history: JSON.stringify({}),
            url: '',
            tags: JSON.stringify(tagsArray),
            sticky: false,
            lastUpdated: new Date().toJSON(),
            added: new Date().toJSON(),
         };
         keywordsToAdd.push(newKeyword);
      });

      try {
         const newKeywords:Keyword[] = await Keyword.bulkCreate(keywordsToAdd);
         const formattedkeywords = newKeywords.map((el) => el.get({ plain: true }));
         const keywordsParsed: KeywordType[] = parseKeywords(formattedkeywords);
         const settings = await getAppSettings();
         refreshAndUpdateKeywords(newKeywords, settings); // Queue the SERP Scraping Process
         return res.status(201).json({ keywords: keywordsParsed });
      } catch (error) {
         return res.status(400).json({ error: 'Could Not Add New Keyword!' });
      }
   } else {
      return res.status(400).json({ error: 'Necessary Keyword Data Missing' });
   }
};

const deleteKeywords = async (req: NextApiRequest, res: NextApiResponse<KeywordsDeleteRes>) => {
   if (!req.query.id && typeof req.query.id !== 'string') {
      return res.status(400).json({ error: 'keyword ID is Required!' });
   }
   console.log('req.query.id: ', req.query.id);

   try {
      const keywordsToRemove = (req.query.id as string).split(',').map((item) => parseInt(item, 10));
      const removeQuery = { where: { ID: { [Op.in]: keywordsToRemove } } };
      const removedKeywordCount: number = await Keyword.destroy(removeQuery);
      return res.status(200).json({ keywordsRemoved: removedKeywordCount });
   } catch (error) {
      return res.status(400).json({ error: 'Could Not Remove Keyword!' });
   }
};

const updateKeywords = async (req: NextApiRequest, res: NextApiResponse<KeywordsGetResponse>) => {
   if (!req.query.id && typeof req.query.id !== 'string') {
      return res.status(400).json({ error: 'keyword ID is Required!' });
   }
   if (req.body.sticky === undefined && !req.body.tags === undefined) {
      return res.status(400).json({ error: 'keyword Payload Missing!' });
   }
   const keywordIDs = (req.query.id as string).split(',').map((item) => parseInt(item, 10));
   const { sticky, tags } = req.body;

   try {
      let keywords: KeywordType[] = [];
      if (sticky !== undefined) {
         await Keyword.update({ sticky }, { where: { ID: { [Op.in]: keywordIDs } } });
         const updateQuery = { where: { ID: { [Op.in]: keywordIDs } } };
         const updatedKeywords:Keyword[] = await Keyword.findAll(updateQuery);
         const formattedKeywords = updatedKeywords.map((el) => el.get({ plain: true }));
          keywords = parseKeywords(formattedKeywords);
         return res.status(200).json({ keywords });
      }
      if (tags) {
         const tagsKeywordIDs = Object.keys(tags);
         for (const keywordID of tagsKeywordIDs) {
            const response = await Keyword.findOne({ where: { ID: keywordID } });
            if (response) {
               await response.update({ tags: JSON.stringify(tags[keywordID]) });
            }
         }
         return res.status(200).json({ keywords });
      }
      return res.status(400).json({ error: 'Invalid Payload!' });
   } catch (error) {
      console.log('ERROR updateKeywords: ', error);
      return res.status(200).json({ error: 'Error Updating keywords!' });
   }
};