require('dotenv').config();
const express = require('express');
const cors = require('cors');

const app = express();
const port = process.env.PORT || 3001;

app.use(cors());
app.use(express.json());

const axios = require('axios');

app.get('/auth/discord', (req, res) => {
  const url = `https://discord.com/api/oauth2/authorize?client_id=${process.env.DISCORD_CLIENT_ID}&redirect_uri=${encodeURIComponent('http://localhost:3002/auth/discord/callback')}&response_type=code&scope=identify%20guilds`;
  res.redirect(url);
});

app.get('/auth/discord/callback', async (req, res) => {
  const code = req.query.code;
  if (!code) {
    return res.status(400).send('No code provided');
  }

  try {
    const params = new URLSearchParams();
    params.append('client_id', process.env.DISCORD_CLIENT_ID);
    params.append('client_secret', process.env.DISCORD_CLIENT_SECRET);
    params.append('grant_type', 'authorization_code');
    params.append('code', code);
    params.append('redirect_uri', 'http://localhost:3002/auth/discord/callback');

    const response = await axios.post('https://discord.com/api/oauth2/token', params, {
      headers: {
        'Content-Type': 'application/x-www-form-urlencoded',
      },
    });

    const { access_token } = response.data;

    const userResponse = await axios.get('https://discord.com/api/users/@me', {
      headers: {
        Authorization: `Bearer ${access_token}`,
      },
    });

    const guildsResponse = await axios.get('https://discord.com/api/users/@me/guilds', {
        headers: {
          Authorization: `Bearer ${access_token}`,
        },
      });
  
      const adminGuilds = guildsResponse.data.filter(guild => (guild.permissions & 0x8) === 0x8);
  
      const user = userResponse.data;
      fs.readFile('db.json', 'utf8', (err, data) => {
        if (err) {
          console.error(err);
          user.theme = 'light';
        } else {
          const db = JSON.parse(data);
          user.theme = db.users && db.users[user.id] ? db.users[user.id].theme : 'light';
        }
        const guilds = adminGuilds;
        res.redirect(`http://localhost:3000/dashboard?user=${encodeURIComponent(JSON.stringify(user))}&guilds=${encodeURIComponent(JSON.stringify(guilds))}`);
      });
    } catch (error) {
      console.error('Error during Discord OAuth2 callback:', error);
      res.status(500).send('Internal Server Error');
    }
  });

const fs = require('fs');

app.get('/api/servers/:guildId/settings', (req, res) => {
  const { guildId } = req.params;
  fs.readFile('db.json', 'utf8', (err, data) => {
    if (err) {
      console.error(err);
      return res.status(500).send('Internal Server Error');
    }
    const db = JSON.parse(data);
    const settings = db[guildId] || { pingCommand: false };
    res.json(settings);
  });
});

app.post('/api/servers/:guildId/settings', (req, res) => {
  const { guildId } = req.params;
  const { pingCommand } = req.body;
  fs.readFile('db.json', 'utf8', (err, data) => {
    if (err) {
      console.error(err);
      return res.status(500).send('Internal Server Error');
    }
    const db = JSON.parse(data);
    db[guildId] = { pingCommand };
    fs.writeFile('db.json', JSON.stringify(db, null, 2), (err) => {
      if (err) {
        console.error(err);
        return res.status(500).send('Internal Server Error');
      }
      res.json({ success: true });
    });
  });
});

app.get('/api/servers/:guildId/bot-status', (req, res) => {
  const { guildId } = req.params;
  const guild = bot.client.guilds.cache.get(guildId);
  if (guild) {
    res.json({ isBotInServer: true });
  } else {
    res.json({ isBotInServer: false });
  }
});

app.get('/api/client-id', (req, res) => {
  res.json({ clientId: process.env.DISCORD_CLIENT_ID });
});

app.post('/api/user/theme', (req, res) => {
  const { userId, theme } = req.body;
  fs.readFile('db.json', 'utf8', (err, data) => {
    if (err) {
      console.error(err);
      return res.status(500).send('Internal Server Error');
    }
    const db = JSON.parse(data);
    if (!db.users) {
      db.users = {};
    }
    if (!db.users[userId]) {
      db.users[userId] = {};
    }
    db.users[userId].theme = theme;
    fs.writeFile('db.json', JSON.stringify(db, null, 2), (err) => {
      if (err) {
        console.error(err);
        return res.status(500).send('Internal Server Error');
      }
      res.json({ success: true });
    });
  });
});

app.get('/', (req, res) => {
  res.send('Hello from the backend!');
});

const bot = require('../discord-bot');

bot.login();

app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});