package backend

import (
	"math/rand"
	"music-server/internal/db/repository"
	"music-server/internal/logging"
	"os"
	"strconv"
	"strings"

	"go.uber.org/zap"
)

type SongInfo struct {
	Soundtrack       string `json:"Soundtrack"`
	SoundtrackPlayed int32  `json:"SoundtrackPlayed"`
	Song             string `json:"Song"`
	SongPlayed       int32  `json:"SongPlayed"`
	CurrentlyPlaying bool   `json:"CurrentlyPlaying"`
	SongNo           int    `json:"SongNo"`
}

var currentSong = -1

var soundtracksNew []repository.Soundtrack

var songQueNew []repository.Song

var lastFetchedNew repository.Song

func initRepo() {
	// This function is kept for backward compatibility
	// but now uses the backend package's initialized repo
	// If not initialized, this will panic intentionally
	if BackendRepo() == nil {
		panic("backend not initialized - call backend.InitBackend() first")
	}
}

func getAllSoundtracks() []repository.Soundtrack {
	if len(soundtracksNew) == 0 {
		initRepo()
		soundtracksNew, _ = BackendRepo().FindAllSoundtracks(BackendCtx())
	}
	return soundtracksNew

}

func GetSoundCheckSong() string {
	files, err := os.ReadDir("songs")
	if err != nil {
		logging.GetLogger().Fatal("Failed to read songs directory", zap.String("error", err.Error()))
	}
	fileInfo := files[rand.Intn(len(files))]
	return "songs/" + fileInfo.Name()
}

func Reset() {
	songQueNew = nil
	currentSong = -1
	initRepo()
	soundtracksNew, _ = BackendRepo().FindAllSoundtracks(BackendCtx())
}

func AddLatestToQue() {
	if lastFetchedNew.Path != "" {
		currentSong = len(songQueNew)
		songQueNew = append(songQueNew, lastFetchedNew)
		lastFetchedNew = repository.Song{}
	}
}

func AddLatestPlayed() {
	if len(songQueNew) == 0 {
		return
	}
	currentSongData := songQueNew[currentSong]

	initRepo()
	BackendRepo().AddSoundtrackPlayed(BackendCtx(), currentSongData.SoundtrackID)
	BackendRepo().AddSongPlayed(BackendCtx(), repository.AddSongPlayedParams{SoundtrackID: currentSongData.SoundtrackID, SongName: currentSongData.SongName})
}

func SetPlayed(songNumber int) {
	if len(songQueNew) == 0 || songNumber >= len(songQueNew) {
		return
	}
	songData := songQueNew[songNumber]
	initRepo()
	BackendRepo().AddSoundtrackPlayed(BackendCtx(), songData.SoundtrackID)
	BackendRepo().AddSongPlayed(BackendCtx(), repository.AddSongPlayedParams{SoundtrackID: songData.SoundtrackID, SongName: songData.SongName})
}

func GetRandomSong() string {
	getAllSoundtracks()
	if len(soundtracksNew) == 0 {
		return ""
	}

	song := getSongFromList(soundtracksNew)
	lastFetchedNew = song
	return song.Path
}

func GetRandomSongLowChance() string {
	getAllSoundtracks()

	var listOfSoundtracks []repository.Soundtrack

	var averagePlayed = getAveragePlayed()

	for _, data := range soundtracksNew {
		timesToAdd := averagePlayed - data.TimesPlayed
		if timesToAdd <= 0 {
			listOfSoundtracks = append(listOfSoundtracks, data)
		} else {
			for i := int32(0); i < timesToAdd; i++ {
				listOfSoundtracks = append(listOfSoundtracks, data)
			}
		}
	}
	song := getSongFromList(listOfSoundtracks)

	lastFetchedNew = song
	return song.Path

}

func GetRandomSongClassic() string {
	getAllSoundtracks()

	var listOfAllSongs []repository.Song
	for _, soundtrack := range soundtracksNew {
		songList, _ := BackendRepo().FindSongsFromSoundtrack(BackendCtx(), soundtrack.ID)
		listOfAllSongs = append(listOfAllSongs, songList...)
	}

	songFound := false
	var song repository.Song
	for !songFound {
		song = listOfAllSongs[rand.Intn(len(listOfAllSongs))]
		soundtrackData, err := BackendRepo().GetSoundtrackById(BackendCtx(), song.SoundtrackID)

		if err != nil {
			BackendRepo().RemoveBrokenSong(BackendCtx(), repository.RemoveBrokenSongParams{SoundtrackID: song.SoundtrackID, Path: song.Path})
			logging.GetLogger().Warn("Song not found, removed from database",
				zap.String("song", song.SongName),
				zap.String("soundtrack", soundtrackData.SoundtrackName),
				zap.String("filename", *song.FileName))
			continue
		}

		//Check if file exists and open
		openFile, err := os.Open(song.Path)
		if err != nil || (song.FileName != nil && soundtrackData.Path+*song.FileName != song.Path) {
			//File not found
			BackendRepo().RemoveBrokenSong(BackendCtx(), repository.RemoveBrokenSongParams{SoundtrackID: song.SoundtrackID, Path: song.Path})
			logging.GetLogger().Warn("Song not found, removed from database",
				zap.String("song", song.SongName),
				zap.String("soundtrack", soundtrackData.SoundtrackName),
				zap.String("filename", *song.FileName))
		} else {
			songFound = true
		}
		err = openFile.Close()
		if err != nil {
			logging.GetLogger().Error("Failed to close file", zap.String("error", err.Error()))
		}
	}
	lastFetchedNew = song
	return song.Path
}

func GetSongInfo() SongInfo {
	if songQueNew == nil {
		return SongInfo{}
	}
	var currentSongData = songQueNew[currentSong]

	currentSoundtrackData := getCurrentSoundtrack(currentSongData)

	return SongInfo{
		Soundtrack:       currentSoundtrackData.SoundtrackName,
		SoundtrackPlayed: currentSoundtrackData.TimesPlayed,
		Song:             currentSongData.SongName,
		SongPlayed:       currentSongData.TimesPlayed,
		CurrentlyPlaying: true,
		SongNo:           currentSong,
	}
}

func GetPlayedSongs() []SongInfo {
	var songList []SongInfo

	for i, song := range songQueNew {
		soundtrackData := getCurrentSoundtrack(song)
		songList = append(songList, SongInfo{
			Soundtrack:       soundtrackData.SoundtrackName,
			SoundtrackPlayed: soundtrackData.TimesPlayed,
			Song:             song.SongName,
			SongPlayed:       song.TimesPlayed,
			CurrentlyPlaying: i == currentSong,
			SongNo:           i,
		})
	}
	return songList
}

func GetSong(song string) string {
	currentSong, _ = strconv.Atoi(song)
	if currentSong >= len(songQueNew) {
		currentSong = len(songQueNew) - 1
	} else if currentSong < 0 {
		currentSong = 0
	}
	songData := songQueNew[currentSong]
	return songData.Path
}

func GetAllSoundtracks() []string {
	getAllSoundtracks()

	var jsonArray []string
	for _, soundtrack := range soundtracksNew {
		jsonArray = append(jsonArray, soundtrack.SoundtrackName)
	}
	return jsonArray
}

func GetAllSoundtracksRandom() []string {
	getAllSoundtracks()

	var jsonArray []string
	for _, soundtrack := range soundtracksNew {
		jsonArray = append(jsonArray, soundtrack.SoundtrackName)
	}
	rand.Shuffle(len(jsonArray), func(i, j int) { jsonArray[i], jsonArray[j] = jsonArray[j], jsonArray[i] })
	return jsonArray
}

func GetNextSong() string {
	if songQueNew == nil {
		return ""
	}
	if currentSong == len(songQueNew)-1 || currentSong == -1 {
		songData := songQueNew[currentSong]
		return songData.Path
	} else {
		currentSong = currentSong + 1
		songData := songQueNew[currentSong]
		return songData.Path
	}
}

func GetPreviousSong() string {
	if songQueNew == nil {
		return ""
	}
	if currentSong == -1 || currentSong == 0 {
		songData := songQueNew[0]
		return songData.Path
	} else {
		currentSong = currentSong - 1
		songData := songQueNew[currentSong]
		return songData.Path
	}
}

func getSongFromList(soundtracks []repository.Soundtrack) repository.Song {
	songFound := false
	var song repository.Song
	for !songFound {
		soundtrack := getRandomSoundtrack(soundtracks)
		songs, _ := BackendRepo().FindSongsFromSoundtrack(BackendCtx(), soundtrack.ID)
		if len(songs) == 0 {
			continue
		}
		song = songs[rand.Intn(len(songs))]
		logging.GetLogger().Debug("Selected song", zap.String("song", song.SongName), zap.String("path", song.Path))

		//Check if file exists and open
		openFile, err := os.Open(song.Path)
		if err != nil || (song.FileName != nil && soundtrack.Path+*song.FileName != song.Path) || (song.FileName != nil && strings.HasSuffix(*song.FileName, ".wav")) {
			//File not found
			BackendRepo().RemoveBrokenSong(BackendCtx(), repository.RemoveBrokenSongParams{SoundtrackID: song.SoundtrackID, Path: song.Path})
			logging.GetLogger().Warn("Song not found, removed from database",
				zap.String("song", song.SongName),
				zap.String("soundtrack", soundtrack.SoundtrackName),
				zap.Any("filename", song.FileName))
		} else {
			songFound = true
		}

		err = openFile.Close()
		if err != nil {
			logging.GetLogger().Error("Failed to close file", zap.String("path", song.Path), zap.String("error", err.Error()))
		}
	}
	return song
}

func getCurrentSoundtrack(currentSongData repository.Song) repository.Soundtrack {
	for _, soundtrack := range soundtracksNew {
		if soundtrack.ID == currentSongData.SoundtrackID {
			return soundtrack
		}
	}
	return repository.Soundtrack{}
}

func getAveragePlayed() int32 {
	getAllSoundtracks()
	var sum int32
	for _, data := range soundtracksNew {
		sum += data.TimesPlayed
	}
	return sum / int32(len(soundtracksNew))
}

func getRandomSoundtrack(listOfSoundtracks []repository.Soundtrack) repository.Soundtrack {
	return listOfSoundtracks[rand.Intn(len(listOfSoundtracks))]
}