import { Router } from "express";
import { ADMIN_KEY, FULL_SERVER_ROOT } from "../Modules/Constants";
import { Song } from "../Schemas/Song";
import { ValidateBody } from "../Modules/Middleware";
import { writeFileSync } from "fs";
import exif from "exif-reader";
import j from "joi";

const App = Router();

// ! ANY ENDPOINTS DEFINED IN THIS FILE WILL REQUIRE ADMIN AUTHORIZATION !
// ! ANY ENDPOINTS DEFINED IN THIS FILE WILL REQUIRE ADMIN AUTHORIZATION !
// ! ANY ENDPOINTS DEFINED IN THIS FILE WILL REQUIRE ADMIN AUTHORIZATION !

App.use((req, res, next) => {
    if (req.path === "/key")
        return res.status(req.body.Key === ADMIN_KEY ? 200 : 403).send(req.body.Key === ADMIN_KEY ? "Login successful!" : "Key doesn't match. Try again.");

    if ((req.cookies["AdminKey"] ?? req.header("Authorization")) !== ADMIN_KEY)
        return res.status(403).send("You don't have permission to access this endpoint.");

    next();
});

App.get("/test", (_, res) => res.send("Permission check OK"));

App.get("/tracks", async (_, res) => res.json((await Song.find()).map(x => x.Package())));

App.post("/create/song",
ValidateBody(j.object({
    ID: j.string().uuid(),
    Name: j.string().required().min(3).max(64),
    Year: j.number().required().min(1).max(2999),
    ArtistName: j.string().required().min(1).max(64),
    Length: j.number().required().min(1),
    Scale: j.string().valid("Minor", "Major").required(),
    Key: j.string().valid("A", "Ab", "B", "Bb", "C", "Cb", "D", "Db", "E", "Eb", "F", "Fb", "G", "Gb").required(),
    Album: j.string().required(),
    GuitarStarterType: j.string().valid("Keytar", "Guitar").required(),
    Tempo: j.number().min(20).max(1250).required(),
    Midi: j.string().uri(),
    Cover: j.string().uri(),
    Lipsync: j.string().uri(),
    BassDifficulty: j.number().required().min(0).max(7),
    GuitarDifficulty: j.number().required().min(0).max(7),
    DrumsDifficulty: j.number().required().min(0).max(7),
    VocalsDifficulty: j.number().required().min(0).max(7)
})),
async (req, res) => {
    res.json(await Song.create(req.body).save())
});

App.post("/upload/midi",
ValidateBody(j.object({
    Data: j.string().hex().required(),
    TargetSong: j.string().uuid().required()
})),
async (req, res) => {
    const Decoded = Buffer.from(req.body.Data, "hex");

    if (!Decoded.toString().startsWith("MThd"))
        return res.status(400).send("Uploaded MIDI file is not a valid MIDI.");

    if (!await Song.exists({ where: { ID: req.body.TargetSong } }))
        return res.status(404).send("The song you're trying to upload a MIDI for does not exist.");

    writeFileSync(`./Saved/Songs/${req.body.TargetSong}/Data.mid`, Decoded);
    res.send(`${FULL_SERVER_ROOT}/song/download/${req.body.TargetSong}/midi.mid`);
});

App.post("/upload/cover",
ValidateBody(j.object({
    Data: j.string().hex().required(),
    TargetSong: j.string().uuid().required()
})),
async (req, res) => {
    const Decoded = Buffer.from(req.body.Data, "hex");

    if (!await Song.exists({ where: { ID: req.body.TargetSong } }))
        return res.status(404).send("The song you're trying to upload a cover for does not exist.");

    try { // todo: fix
        /*const ImageMetadata = exif(Decoded);
        if (!ImageMetadata.Image?.ImageWidth || !ImageMetadata.Image?.ImageLength)
            throw new Error("Invalid image file.");

        if (ImageMetadata.Image.ImageWidth !== ImageMetadata.Image.ImageLength)
            return res.status(400).send("Image must have a 1:1 ratio.");

        if (ImageMetadata.Image.ImageWidth < 512 || ImageMetadata.Image.ImageWidth > 2048)
            return res.status(400).send("Image cannot be smaller than 512 pixels and larger than 2048 pixels.");*/
    } catch (err) {
        console.error(err)
        return res.status(400).send("Invalid image file.");
    }

    writeFileSync(`./Saved/Songs/${req.body.TargetSong}/Cover.png`, Decoded);
    res.send(`${FULL_SERVER_ROOT}/song/download/${req.body.TargetSong}/cover.png`);
});

export default {
    App,
    DefaultAPI: "/admin/api"
}