import { Application } from "express";
import { dbDelete, dbRead, dbStore } from "../database.js";
import createHttpError from "http-errors";
import generateID from "../idgen.js";

export default function playlists(app: Application) {

    app.get('/playlists/list', (req, res) => {
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);

        res.send(
            user.playlists
                .map((pId: string) => dbRead('playlists', pId))
        );
    });

    app.get('/playlists/:id', (req, res) => {
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);

        if (!user.playlists.includes(req.params.id)) throw createHttpError[403]();

        res.send(
            dbRead('playlists', req.params.id)
        );
    });

    app.post('/playlists/new', (req, res) => {
        if (typeof req.body.name !== 'string') throw createHttpError[400]();
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);
        const id = generateID();

        user.playlists.push(id);

        dbStore('playlists', id, {
            id,
            owner: username,
            songs: [],
            name: req.body.name
        });

        dbStore('users', username, user);

        res.send({
            id
        });
    });

    app.delete('/playlists/:id', (req, res) => {
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);

        if (!user.playlists.includes(req.params.id)) throw createHttpError[403]();
        user.playlists = user.playlists.filter((x: string) => x !== req.params.id);

        dbDelete('playlists', req.params.id);
        dbStore('users', username, user);

        res.send({
            ok: true
        });
    });

    app.post('/playlists/:id', (req, res) => {
        if (typeof req.params.id !== 'string' || typeof req.body.songId !== 'string') throw createHttpError[400]();
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);

        if (!user.playlists.includes(req.params.id)) throw createHttpError[404]();
        const playlist = dbRead('playlists', req.params.id);
        playlist.songs.push(req.body.songId);

        dbStore('playlists', req.params.id, playlist);

        res.send({
            ok: true
        });
    });

    app.delete('/playlists/:id/:songId', (req, res) => {
        if (typeof req.params.id !== 'string' || typeof req.params.songId !== 'string') throw createHttpError[400]();
        const username = req.headers['x-username'] as string;
        const user = dbRead('users', username);

        if (!user.playlists.includes(req.params.id)) throw createHttpError[404]();
        const playlist = dbRead('playlists', req.params.id);
        playlist.songs = playlist.songs.filter((x: string) => x !== req.params.songId);

        dbStore('playlists', req.params.id, playlist);

        res.send({
            ok: true
        });
    });

}