package backend

import (
	"os"
	"sync"

	"github.com/google/uuid"
	"github.com/pelletier/go-toml/v2"
)

type ServerType string

const (
	ServerTypeSubsonic ServerType = "Subsonic"
	ServerTypeJellyfin ServerType = "Jellyfin"
)

type ServerConnection struct {
	ServerType  ServerType
	Hostname    string
	AltHostname string
	Username    string
	LegacyAuth  bool
}

type ServerConfig struct {
	ServerConnection
	ID       uuid.UUID
	Nickname string
	Default  bool
}

type AppConfig struct {
	WindowWidth                 int
	WindowHeight                int
	LastCheckedVersion          string
	LastLaunchedVersion         string
	EnableSystemTray            bool
	CloseToSystemTray           bool
	StartupPage                 string
	SettingsTab                 string
	AllowMultiInstance          bool
	MaxImageCacheSizeMB         int
	SavePlayQueue               bool
	SaveQueueToServer           bool
	DefaultPlaylistID           string
	AddToPlaylistSkipDuplicates bool
	ShowTrackChangeNotification bool
	EnableLrcLib                bool
	EnablePasswordStorage       bool
	SkipSSLVerify               bool
	EnqueueBatchSize            int
	Language                    string

	// Experimental - may be removed in future
	FontNormalTTF string
	FontBoldTTF   string
	UIScaleSize   string
}

type AlbumPageConfig struct {
	TracklistColumns []string
}

type AlbumsPageConfig struct {
	SortOrder string
	ShowYears bool
}

type ArtistPageConfig struct {
	InitialView      string
	DiscographySort  string
	TracklistColumns []string
}

type ArtistsPageConfig struct {
	SortOrder string
}

type FavoritesPageConfig struct {
	InitialView      string
	TracklistColumns []string
	ShowAlbumYears   bool
}

type PlaylistPageConfig struct {
	TracklistColumns []string
}

type PlaylistsPageConfig struct {
	InitialView string
}

type TracksPageConfig struct {
	TracklistColumns []string
}

type NowPlayingPageConfig struct {
	InitialView string
}

type PlaybackConfig struct {
	Autoplay   bool
	RepeatMode string
}

type LocalPlaybackConfig struct {
	AudioDeviceName       string
	AudioExclusive        bool
	InMemoryCacheSizeMB   int
	Volume                int
	EqualizerEnabled      bool
	EqualizerPreamp       float64
	GraphicEqualizerBands []float64
}

type ScrobbleConfig struct {
	Enabled              bool
	ThresholdTimeSeconds int
	ThresholdPercent     int
}

type ReplayGainConfig struct {
	Mode            string
	PreampGainDB    float64
	PreventClipping bool
}

type ThemeConfig struct {
	ThemeFile  string
	Appearance string
}

type TranscodingConfig struct {
	ForceRawFile bool
}

type PeakMeterConfig struct {
	WindowHeight int
	WindowWidth  int
}

type Config struct {
	Application      AppConfig
	Servers          []*ServerConfig
	AlbumPage        AlbumPageConfig
	AlbumsPage       AlbumsPageConfig
	ArtistPage       ArtistPageConfig
	ArtistsPage      ArtistsPageConfig
	FavoritesPage    FavoritesPageConfig
	PlaylistPage     PlaylistPageConfig
	PlaylistsPage    PlaylistsPageConfig
	TracksPage       TracksPageConfig
	NowPlayingConfig NowPlayingPageConfig
	Playback         PlaybackConfig
	LocalPlayback    LocalPlaybackConfig
	Scrobbling       ScrobbleConfig
	ReplayGain       ReplayGainConfig
	Transcoding      TranscodingConfig
	Theme            ThemeConfig
	PeakMeter        PeakMeterConfig
}

var SupportedStartupPages = []string{"Albums", "Favorites", "Playlists"}

func DefaultConfig(appVersionTag string) *Config {
	return &Config{
		Application: AppConfig{
			WindowWidth:                 1000,
			WindowHeight:                800,
			LastCheckedVersion:          appVersionTag,
			LastLaunchedVersion:         "",
			EnableSystemTray:            true,
			CloseToSystemTray:           false,
			StartupPage:                 "Albums",
			SettingsTab:                 "General",
			AllowMultiInstance:          false,
			MaxImageCacheSizeMB:         50,
			UIScaleSize:                 "Normal",
			SavePlayQueue:               true,
			SaveQueueToServer:           false,
			ShowTrackChangeNotification: false,
			EnableLrcLib:                true,
			EnablePasswordStorage:       true,
			SkipSSLVerify:               false,
			EnqueueBatchSize:            100,
			Language:                    "auto",
		},
		AlbumPage: AlbumPageConfig{
			TracklistColumns: []string{"Artist", "Time", "Plays", "Favorite", "Rating"},
		},
		AlbumsPage: AlbumsPageConfig{
			SortOrder: string("Recently Added"),
			ShowYears: false,
		},
		ArtistPage: ArtistPageConfig{
			InitialView:      "Discography",
			TracklistColumns: []string{"Album", "Time", "Plays", "Favorite", "Rating"},
		},
		ArtistsPage: ArtistsPageConfig{
			SortOrder: string("Name (A-Z)"),
		},
		FavoritesPage: FavoritesPageConfig{
			TracklistColumns: []string{"Album", "Time", "Plays"},
			InitialView:      "Albums",
			ShowAlbumYears:   false,
		},
		PlaylistPage: PlaylistPageConfig{
			TracklistColumns: []string{"Album", "Time", "Plays"},
		},
		PlaylistsPage: PlaylistsPageConfig{
			InitialView: "List",
		},
		NowPlayingConfig: NowPlayingPageConfig{
			InitialView: "Play Queue",
		},
		TracksPage: TracksPageConfig{
			TracklistColumns: []string{"Album", "Time", "Plays"},
		},
		Playback: PlaybackConfig{
			Autoplay:   false,
			RepeatMode: "None",
		},
		LocalPlayback: LocalPlaybackConfig{
			// "auto" is the name to pass to MPV for autoselecting the output device
			AudioDeviceName:       "auto",
			AudioExclusive:        false,
			InMemoryCacheSizeMB:   30,
			Volume:                100,
			EqualizerEnabled:      false,
			EqualizerPreamp:       0,
			GraphicEqualizerBands: make([]float64, 15),
		},
		Scrobbling: ScrobbleConfig{
			Enabled:              true,
			ThresholdTimeSeconds: 240,
			ThresholdPercent:     50,
		},
		ReplayGain: ReplayGainConfig{
			Mode:            ReplayGainNone,
			PreampGainDB:    0.0,
			PreventClipping: true,
		},
		Transcoding: TranscodingConfig{
			ForceRawFile: false,
		},
		Theme: ThemeConfig{
			Appearance: "Dark",
		},
		PeakMeter: PeakMeterConfig{
			WindowWidth:  375,
			WindowHeight: 100,
		},
	}
}

func ReadConfigFile(filepath, appVersionTag string) (*Config, error) {
	f, err := os.Open(filepath)
	if err != nil {
		return nil, err
	}
	defer f.Close()

	c := DefaultConfig(appVersionTag)
	if err := toml.NewDecoder(f).Decode(c); err != nil {
		return nil, err
	}

	// Backfill Subsonic to empty ServerType fields
	// for updating configs created before multiple MediaProviders were added
	for _, s := range c.Servers {
		if s.ServerType == "" {
			s.ServerType = ServerTypeSubsonic
		}
	}

	return c, nil
}

var writeLock sync.Mutex

func (c *Config) WriteConfigFile(filepath string) error {
	if !writeLock.TryLock() {
		return nil // another write in progress
	}
	defer writeLock.Unlock()

	b, err := toml.Marshal(c)
	if err != nil {
		return err
	}
	os.WriteFile(filepath, b, 0644)

	return nil
}