package main

import (
	"errors"
	"fmt"
	"log"
	"os"
	"sync"

	"github.com/adrg/xdg"
	"github.com/go-resty/resty/v2"
)

type AuthError struct {
	Error string `json:"error"`
}

const appname = "wMusic"

var LoggedUser AuthSuccess
var randomAlbumWaitGroup sync.WaitGroup
var randomAlbums []Album

var serverUrl = ""
var client = resty.New()

// (Tries to) login to a remote navidrome server
func (a *App) Login(server, username, password string) (bool, error) {
	log.Print("begin Login to server")
	// client := resty.New()

	// TODO: check server for leading https and trailing /, normalize

	successData := AuthSuccess{}
	errorData := AuthError{}

	response, err := client.R().
		SetHeader("Content-Type", "").
		SetBody(fmt.Sprintf(`{"username":"%s","password":"%s"}`, username, password)).
		SetResult(&successData).
		SetError(&errorData).
		Post(fmt.Sprintf("%s/auth/login", server))

	if err != nil {
		log.Print("Login error", err)
		return false, err
	}

	if response.IsSuccess() {
		log.Printf("%+v", successData)

		// Set the auth header globally
		client.SetHeader("x-nd-authorization", successData.Token)
		serverUrl = server

		// Set global session
		LoggedUser = successData
		// Begin to load the list of albums on the background
		randomAlbumWaitGroup.Add(1)
		go loadAlbums(server)

		return true, nil
	} else if response.IsError() {
		log.Printf("%+v", errorData)
		return false, errors.New(errorData.Error + ".")
	} else {
		log.Printf("ehhh???")
		return false, errors.New("invalid state")
	}
}

// Waits for the random albums to be loaded, and returns them.
// This function assumes that the random albums are being loaded in the background.
func (a *App) GetRandomAlbums() ([]Album, error) {
	log.Printf("Waiting for loading group...")
	randomAlbumWaitGroup.Wait()
	log.Printf("Waiting group finished")

	return randomAlbums, nil
}

// Loads a list of random albums from the server.
func loadAlbums(serverUrl string) {
	defer randomAlbumWaitGroup.Done()
	log.Print("begin loadAlbums")
	client := resty.New()

	var errorData AuthError
	response, err := client.R().
		SetHeader("x-nd-authorization", fmt.Sprintf("Bearer %s", LoggedUser.Token)).
		SetResult(&randomAlbums).
		SetError(&errorData).
		Get(fmt.Sprintf("%s/api/album?_end=20&_order=DESC&_sort=random&_start=0", serverUrl))

	if err != nil {
		log.Print("Get albums error")
	}

	if response.IsSuccess() {
		log.Print("Get albums success")
		// TODO: Begin to load album artwork in the background
		// Album artwork comes from the url /rest/getCoverArt.view
		// Cache album images in XDG_CACHE_HOME
		for _, album := range randomAlbums {
			albumId := album.ID

			go loadAlbumCover(albumId)
		}
	}

	// TODO: Do the loading
}

// Loads a single album cover and caches it in XDG_CACHE_HOME
func loadAlbumCover(albumId string) {
	log.Print("Loading albumCover for ", albumId)

	response, err := client.R().
		// TODO: replace `fernando` with the username
		Get(fmt.Sprintf(
			"%s/rest/getCoverArt.view?id=%s&u=fernando&s=12e7f3&t=%s&v=1.13.0&c=wmusic&size=300",
			serverUrl,
			albumId,
			"d7bbe92d7da363aa202ae16136887adc",
		))

	if err != nil {
		log.Print("error loadAlbumCover: ", err)
		return
	}

	if !response.IsSuccess() {
		log.Print("error loadAlbumCover")
		log.Printf("%s", response.Body())
		return
	}

	imgBytes := response.Body()

	// Write the image to cache
	// TODO: Actually check in cache if the album art exists
	cacheFile, err := xdg.CacheFile(fmt.Sprintf("%s/%s", appname, albumId))

	if err != nil {
		log.Print("error loadAlbumCover - CacheFile:", err)
		return
	}

	err = os.WriteFile(cacheFile, imgBytes, 0666)
	if err != nil {
		panic(fmt.Sprintf("Error writing to cache file for album cover: %s", cacheFile))
	}

	log.Print("Loading albumCover for ", albumId, " successful")
}