import got from "got/dist/source"
import { SpotifyAlbum, SpotifyPlaylist, SpotifyVideo } from "./classes"
import readline from 'readline'
import fs from 'fs'

var spotifyData : SpotifyDataOptions;
if(fs.existsSync('.data/spotify.data')){
    spotifyData = JSON.parse(fs.readFileSync('.data/spotify.data').toString())
}

export interface SpotifyDataOptions{
    client_id : string;
    client_secret : string;
    redirect_url : string;
    authorization_code? :string;
    access_token? : string;
    refresh_token? : string;
    token_type? : string;
    expires_in? : number;
    expiry? : number;
    market? : string;
}

const pattern = /^((https:)?\/\/)?open.spotify.com\/(track|album|playlist)\//

export async function spotify(url : string): Promise<SpotifyAlbum | SpotifyPlaylist | SpotifyVideo>{
    if(!spotifyData) throw new Error('Spotify Data is missing\nDid you forgot to do authorization ?')
    if(!url.match(pattern)) throw new Error('This is not a Spotify URL')
    if(url.indexOf('track/') !== -1){
        let trackID = url.split('track/')[1].split('&')[0].split('?')[0]
        let response = await got(`https://api.spotify.com/v1/tracks/${trackID}?market=${spotifyData.market}`, {
            headers : {
                "Authorization" : `${spotifyData.token_type} ${spotifyData.access_token}`
            }
        }).catch((err) => {return 0})
        if(typeof response !== 'number') return new SpotifyVideo(JSON.parse(response.body))
        else throw new Error('Failed to get spotify Track Data')
    }
    else if(url.indexOf('album/') !== -1){
        let albumID = url.split('album/')[1].split('&')[0].split('?')[0]
        let response = await got(`https://api.spotify.com/v1/albums/${albumID}?market=${spotifyData.market}`, {
            headers : {
                "Authorization" : `${spotifyData.token_type} ${spotifyData.access_token}`
            }
        }).catch((err) => {return 0})
        if(typeof response !== 'number') return new SpotifyAlbum(JSON.parse(response.body), spotifyData)
        else throw new Error('Failed to get spotify Album Data')
    }
    else if(url.indexOf('playlist/') !== -1){
        let playlistID = url.split('playlist/')[1].split('&')[0].split('?')[0]
        let response = await got(`https://api.spotify.com/v1/playlists/${playlistID}?market=${spotifyData.market}`, {
            headers : {
                "Authorization" : `${spotifyData.token_type} ${spotifyData.access_token}`
            }
        }).catch((err) => {return 0})
        if(typeof response !== 'number') return new SpotifyPlaylist(JSON.parse(response.body), spotifyData)
        else throw new Error('Failed to get spotify Playlist Data')
    }
    else throw new Error('URL is out of scope for play-dl.')
}

export function sp_validate(url : string): "track" | "playlist" | "album" | boolean{
    if(!url.match(pattern)) return false
    if(url.indexOf('track/') !== -1){
        return "track"
    }
    else if(url.indexOf('album/') !== -1){
        return "album"
    }
    else if(url.indexOf('playlist/') !== -1){
        return "playlist"
    }
    else return false
}

export function Authorization(){
    let ask = readline.createInterface({
        input : process.stdin,
        output : process.stdout
    })
    
    let client_id : string, client_secret : string, redirect_url : string, market : string;
    ask.question('Client ID : ', (id) => {
        client_id = id
        ask.question('Client Secret : ', (secret) => {
            client_secret = secret
            ask.question('Redirect URL : ', (url) => {
                redirect_url = url
                console.log('\nMarket Selection URL : \nhttps://en.wikipedia.org/wiki/ISO_3166-1_alpha-2#Officially_assigned_code_elements \n')
                ask.question('Market : ', (mar) => {
                    if(mar.length === 2) market = mar
                    else {
                        console.log('Invalid Market, Selecting IN as market')
                        market = 'IN'
                    }
                    console.log('\nNow Go to your browser and Paste this url. Authroize it and paste the redirected url here. \n')
                    console.log(`https://accounts.spotify.com/authorize?client_id=${client_id}&response_type=code&redirect_uri=${encodeURI(redirect_url)} \n`)
                    ask.question('Redirected URL : ',async (url) => {
                        if (!fs.existsSync('.data')) fs.mkdirSync('.data')
                        spotifyData = {
                            client_id,
                            client_secret,
                            redirect_url,
                            authorization_code : url.split('code=')[1],
                            market
                        }
                        let check = await SpotifyAuthorize(spotifyData)
                        if(check === false) throw new Error('Failed to get access Token.')
                        ask.close()
                    })
                })
            })
        })
    })
}

async function SpotifyAuthorize(data : SpotifyDataOptions): Promise<boolean>{
    let response = await got.post(`https://accounts.spotify.com/api/token?grant_type=authorization_code&code=${data.authorization_code}&redirect_uri=${encodeURI(data.redirect_url)}`, {
        headers : {
            "Authorization" : `Basic ${Buffer.from(`${data.client_id}:${data.client_secret}`).toString('base64')}`,
            "Content-Type" : "application/x-www-form-urlencoded"
        }
    }).catch(() => {
        return 0
    })
    
    if(typeof response === 'number') return false
    let resp_json = JSON.parse(response.body)
    spotifyData = {
        client_id : data.client_id,
        client_secret : data.client_secret,
        redirect_url : data.redirect_url,
        access_token : resp_json.access_token,
        refresh_token : resp_json.refresh_token,
        expires_in : Number(resp_json.expires_in),
        expiry : Date.now() + (Number(resp_json.expires_in) * 1000),
        token_type : resp_json.token_type,
        market : data.market
    }
    fs.writeFileSync('.data/spotify.data', JSON.stringify(spotifyData, undefined, 4))
    return true
}

export function is_expired(){
    if(Date.now() >= (spotifyData.expiry as number)) return true
    else return false
}

export async function RefreshToken(): Promise<true | false>{
    let response = await got.post(`https://accounts.spotify.com/api/token?grant_type=refresh_token&refresh_token=${spotifyData.refresh_token}`, {
        headers : {
            "Authorization" : `Basic ${Buffer.from(`${spotifyData.client_id}:${spotifyData.client_secret}`).toString('base64')}`,
            "Content-Type" : "application/x-www-form-urlencoded"
        }
    }).catch(() => {
        return 0
    })

    if(typeof response === 'number') return false
    let resp_json = JSON.parse(response.body)
    spotifyData = {
        client_id : spotifyData.client_id,
        client_secret : spotifyData.client_secret,
        redirect_url : spotifyData.redirect_url,
        access_token : resp_json.access_token,
        refresh_token : spotifyData.refresh_token,
        expires_in : Number(resp_json.expires_in),
        expiry : Date.now() + (Number(resp_json.expires_in) * 1000),
        token_type : resp_json.token_type,
        market : spotifyData.market
    }
    fs.writeFileSync('.data/spotify.data', JSON.stringify(spotifyData, undefined, 4))
    return true
}