const express = require("express")
const router = express()
const config = require("../../../config.json")
const controller = require("../../../controllers/db")
const DiscordOauth2 = require("discord-oauth2")

const oauth2 = new DiscordOauth2({
    clientId: config.auth.providers.discord.clientId,
    clientSecret: config.auth.providers.discord.clientSecret,
    redirectUri: config.auth.providers.discord.redirectUri,
})

router.get("", async (req, res) => {
    const { code } = req.query
    if (code) {
        try {
            const token = await oauth2.tokenRequest({ code, grantType: "authorization_code", scope: "identify" })
            const user = await oauth2.getUser(token.access_token)
            if (user) {
                const isUserAlreadyRegisteredRequest = controller.getUser(user.id)
                if (isUserAlreadyRegisteredRequest.success) {
                    const $user = isUserAlreadyRegisteredRequest.user
                    if (user.username != $user.username) {
                        controller.updateUserUsername(user.id, user.username)
                    }
                    if (user.global_name != $user.nickname) {
                        controller.updateUserNickname(user.id, user.global_name)
                    }
                    if (buildAvatarURL(user.id, user.avatar) != $user.avatarUrl) {
                        controller.updateUserAvatar(user.id, buildAvatarURL(user.id, user.avatar))
                    }
                    res.json(controller.getUser(user.id))
                } else {
                    const registerUserRequest = controller.addUser(user.id, user.username, user.global_name, `https://cdn.discordapp.com/avatars/${user.id}/${user.avatar}.png`)
                    res.json(registerUserRequest)
                }
            }
        } catch (error) {
            res.status(500).json({ error: new String(error) })
            console.error(error)
        }
    } else {
        res.redirect(config.auth.providers.discord.oauth2Route)
    }
})

function buildAvatarURL(discordId, avatarId) {
    return `https://cdn.discordapp.com/avatars/${discordId}/${avatarId}.png?size=2048`
}

module.exports = router