package tui

import (
	"fmt"
	"os"
	"time"

	"gospt/internal/commands"
	"gospt/internal/gctx"

	"github.com/charmbracelet/bubbles/key"
	"github.com/charmbracelet/bubbles/list"
	tea "github.com/charmbracelet/bubbletea"
	"github.com/charmbracelet/lipgloss"
	"github.com/zmb3/spotify/v2"
)

var (
	currentlyPlaying string
	main_updates     chan *mainModel
	page             = 1

	docStyle = lipgloss.NewStyle().Margin(1, 2)
)

type mainItem struct {
	Name        string
	Duration    string
	Artist      spotify.SimpleArtist
	ID          spotify.ID
	Desc        string
	SpotifyItem any
	Device      spotify.PlayerDevice
	spotify.SavedTrack
}

func (i mainItem) Title() string       { return i.Name }
func (i mainItem) Description() string { return i.Desc }
func (i mainItem) FilterValue() string { return i.Title() + i.Desc }

type mainModel struct {
	list     list.Model
	ctx      *gctx.Context
	client   *spotify.Client
	mode     string
	playlist spotify.SimplePlaylist
}

func (m mainModel) Init() tea.Cmd {
	main_updates = make(chan *mainModel)
	return nil
}

func (m *mainModel) Tick() {
	ticker := time.NewTicker(5 * time.Second)
	quit := make(chan struct{})
	go func() {
		for {
			select {
			case <-ticker.C:
				playing, _ := m.client.PlayerCurrentlyPlaying(m.ctx)
				currentlyPlaying = "Now playing " + playing.Item.Name + " by " + playing.Item.Artists[0].Name
			case <-quit:
				ticker.Stop()
				return
			}
		}
	}()
}

func HandlePlay(ctx *gctx.Context, client *spotify.Client, uri *spotify.URI, pos int) {
	var err error
	err = commands.PlaySongInPlaylist(ctx, client, uri, pos)
	if err != nil {
		fmt.Println()
		os.Exit(1)
	}
}

func HandleRadio(ctx *gctx.Context, client *spotify.Client, id spotify.ID) {
	err := commands.RadioGivenSong(ctx, client, id, 0)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
}

func (m *mainModel) LoadMoreItems() {
	switch m.mode {
	case "main":
		playlists, err := commands.Playlists(m.ctx, m.client, (page + 1))
		page++
		if err != nil {
			return
		}
		items := []list.Item{}
		for _, playlist := range playlists.Playlists {
			items = append(items, mainItem{
				Name:        playlist.Name,
				Desc:        playlist.Description,
				SpotifyItem: playlist,
			})
		}
		for _, item := range items {
			m.list.InsertItem(len(m.list.Items())+1, item)
		}
		main_updates <- m
		return
	case "playlist":
		tracks, err := commands.PlaylistTracks(m.ctx, m.client, m.playlist.ID, (page + 1))
		page++
		if err != nil {
			return
		}
		items := []mainItem{}
		for _, track := range tracks.Tracks {
			items = append(items, mainItem{
				Name:     track.Track.Name,
				Artist:   track.Track.Artists[0],
				Duration: track.Track.TimeDuration().Round(time.Second).String(),
				ID:       track.Track.ID,
				Desc:     track.Track.Artists[0].Name + " - " + track.Track.TimeDuration().Round(time.Second).String(),
			})
		}
		for _, item := range items {
			m.list.InsertItem(len(m.list.Items())+1, item)
		}
		main_updates <- m
		return
	case "tracks":
		tracks, err := commands.TrackList(m.ctx, m.client, (page + 1))
		page++
		if err != nil {
			return
		}
		page++
		items := []list.Item{}
		for _, track := range tracks.Tracks {
			items = append(items, mainItem{
				Name:     track.Name,
				Artist:   track.Artists[0],
				Duration: track.TimeDuration().Round(time.Second).String(),
				ID:       track.ID,
				Desc:     track.Artists[0].Name + " - " + track.TimeDuration().Round(time.Second).String(),
			})
		}
		for _, item := range items {
			m.list.InsertItem(len(m.list.Items())+1, item)
		}
		main_updates <- m
		return
	}
}

func HandlePlayLikedSong(ctx *gctx.Context, client *spotify.Client, position int) {
	err := commands.PlayLikedSongs(ctx, client, position)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}
}

func (m mainModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	m.list.NewStatusMessage(currentlyPlaying)
	select {
	case update := <-main_updates:
		m.list.SetItems(update.list.Items())
	default:
	}
	if m.list.Paginator.Page == m.list.Paginator.TotalPages-2 && m.list.Cursor() == 0 {
		// if last request was still full request more
		if len(m.list.Items())%50 == 0 {
			go m.LoadMoreItems()
		}
	}
	switch msg := msg.(type) {
	case tea.KeyMsg:
		if msg.String() == "d" {
			m.mode = "devices"
			new_items, err := DeviceView(m.ctx, m.client)
			if err != nil {
				fmt.Println(err.Error())
				os.Exit(1)
			}
			m.list.SetItems(new_items)
			m.list.ResetSelected()
			m.list.NewStatusMessage("Setting view to devices")
		}
		if msg.String() == "backspace" {
			if m.mode == "playlist" || m.mode == "tracks" || m.mode == "devices" {
				m.mode = "main"
				m.list.NewStatusMessage("Setting view to main")
				new_items, err := MainView(m.ctx, m.client)
				if err != nil {
					fmt.Println(err.Error())
				}
				m.list.SetItems(new_items)
			} else {
				return m, tea.Quit
			}
			m.list.ResetSelected()
		}
		if msg.String() == "ctrl+c" {
			return m, tea.Quit
		}
		if msg.String() == "enter" || msg.String() == "spacebar" {
			switch m.mode {
			case "main":
				switch m.list.SelectedItem().(mainItem).SpotifyItem.(type) {
				case spotify.SimplePlaylist:
					m.mode = "playlist"
					playlist := m.list.SelectedItem().(mainItem).SpotifyItem.(spotify.SimplePlaylist)
					m.playlist = playlist
					m.list.NewStatusMessage("Setting view to playlist " + playlist.Name)
					new_items, err := PlaylistView(m.ctx, m.client, playlist)
					if err != nil {
						fmt.Println(err.Error())
						os.Exit(1)
					}
					m.list.SetItems(new_items)
					m.list.ResetSelected()
				case *spotify.SavedTrackPage:
					m.mode = "tracks"
					m.list.NewStatusMessage("Setting view to saved tracks")
					new_items, err := SavedTracksView(m.ctx, m.client)
					if err != nil {
						fmt.Println(err.Error())
						os.Exit(1)
					}
					m.list.SetItems(new_items)
					m.list.ResetSelected()
					m.list.NewStatusMessage("Setting view to tracks")
				}
			case "playlist":
				currentlyPlaying = m.list.SelectedItem().FilterValue()
				m.list.NewStatusMessage("Playing " + currentlyPlaying)
				go HandlePlay(m.ctx, m.client, &m.playlist.URI, m.list.Cursor()+(m.list.Paginator.Page*m.list.Paginator.PerPage))
			case "tracks":
				currentlyPlaying = m.list.SelectedItem().FilterValue()
				m.list.NewStatusMessage("Playing " + currentlyPlaying)
				go HandlePlayLikedSong(m.ctx, m.client, m.list.Cursor()+(m.list.Paginator.Page*m.list.Paginator.PerPage))
			case "devices":
				go HandleSetDevice(m.ctx, m.client, m.list.SelectedItem().(mainItem).Device)
				m.list.NewStatusMessage("Setting device to " + m.list.SelectedItem().FilterValue())
				m.mode = "main"
				m.list.NewStatusMessage("Setting view to main")
				new_items, err := MainView(m.ctx, m.client)
				if err != nil {
					fmt.Println(err.Error())
				}
				m.list.SetItems(new_items)
			}
		}
		if msg.String() == "ctrl+r" {
			switch m.mode {
			case "main":
				switch m.list.SelectedItem().(mainItem).SpotifyItem.(type) {
				case spotify.SimplePlaylist:
					m.list.NewStatusMessage("Not implemented yet")
				case *spotify.SavedTrackPage:
					m.list.NewStatusMessage("Not implemented yet")
				}
			case "playlist":
				currentlyPlaying = m.list.SelectedItem().FilterValue()
				m.list.NewStatusMessage("Starting radio for " + currentlyPlaying)
				go HandleRadio(m.ctx, m.client, m.list.SelectedItem().(mainItem).ID)
			case "tracks":
				currentlyPlaying = m.list.SelectedItem().FilterValue()
				m.list.NewStatusMessage("Playing " + currentlyPlaying)
				go HandleRadio(m.ctx, m.client, m.list.SelectedItem().(mainItem).ID)
			}
		}
	case tea.MouseMsg:
		if msg.Type == 5 {
			m.list.CursorUp()
		}
		if msg.Type == 6 {
			m.list.CursorDown()
		}
	case tea.WindowSizeMsg:
		h, v := docStyle.GetFrameSize()
		m.list.SetSize(msg.Width-h, msg.Height-v)
	}

	var cmd tea.Cmd
	m.list, cmd = m.list.Update(msg)
	return m, cmd
}

func (m mainModel) View() string {
	return docStyle.Render(m.list.View())
}

func DisplayMain(ctx *gctx.Context, client *spotify.Client) error {
	items := []list.Item{}
	saved_items, err := commands.TrackList(ctx, client, 1)
	items = append(items, mainItem{
		Name:        "Saved Tracks",
		Desc:        fmt.Sprintf("%d saved songs", saved_items.Total),
		SpotifyItem: saved_items,
	})
	playlists, err := commands.Playlists(ctx, client, 1)
	if err != nil {
		return err
	}
	for _, playlist := range playlists.Playlists {
		items = append(items, mainItem{
			Name:        playlist.Name,
			Desc:        playlist.Description,
			SpotifyItem: playlist,
		})
	}
	m := mainModel{
		list:   list.New(items, list.NewDefaultDelegate(), 0, 0),
		ctx:    ctx,
		client: client,
		mode:   "main",
	}
	m.list.Title = "GOSPT"
	go m.Tick()

	p := tea.NewProgram(m, tea.WithAltScreen(), tea.WithMouseCellMotion())

	if _, err := p.Run(); err != nil {
		fmt.Println("Error running program:", err)
		os.Exit(1)
	}
	return nil
}

func PlaylistView(ctx *gctx.Context, client *spotify.Client, playlist spotify.SimplePlaylist) ([]list.Item, error) {
	items := []list.Item{}
	tracks, err := commands.PlaylistTracks(ctx, client, playlist.ID, 1)
	if err != nil {
		return nil, err
	}
	for _, track := range tracks.Tracks {
		items = append(items, mainItem{
			Name:     track.Track.Name,
			Artist:   track.Track.Artists[0],
			Duration: track.Track.TimeDuration().Round(time.Second).String(),
			ID:       track.Track.ID,
			Desc:     track.Track.Artists[0].Name + " - " + track.Track.TimeDuration().Round(time.Second).String(),
		})
	}
	return items, nil
}

func SavedTracksView(ctx *gctx.Context, client *spotify.Client) ([]list.Item, error) {
	items := []list.Item{}
	tracks, err := commands.TrackList(ctx, client, 1)
	if err != nil {
		return nil, err
	}
	for _, track := range tracks.Tracks {
		items = append(items, mainItem{
			Name:     track.Name,
			Artist:   track.Artists[0],
			Duration: track.TimeDuration().Round(time.Second).String(),
			ID:       track.ID,
			Desc:     track.Artists[0].Name + " - " + track.TimeDuration().Round(time.Second).String(),
		})
	}

	return items, err
}

func MainView(ctx *gctx.Context, client *spotify.Client) ([]list.Item, error) {
	items := []list.Item{}
	saved_items, err := commands.TrackList(ctx, client, 1)
	items = append(items, mainItem{
		Name:        "Saved Tracks",
		Desc:        fmt.Sprintf("%d saved songs", saved_items.Total),
		SpotifyItem: saved_items,
	})
	playlists, err := commands.Playlists(ctx, client, 1)
	if err != nil {
		return nil, err
	}
	for _, playlist := range playlists.Playlists {
		items = append(items, mainItem{
			Name:        playlist.Name,
			Desc:        playlist.Description,
			SpotifyItem: playlist,
		})
	}
	return items, nil
}

func InitMain(ctx *gctx.Context, client *spotify.Client, mode string) (tea.Model, error) {
	items := []list.Item{}
	var err error
	switch mode {
	case "main":
		items, err = MainView(ctx, client)
		if err != nil {
			return nil, err
		}
	case "devices":
		items, err = DeviceView(ctx, client)
		if err != nil {
			return nil, err
		}
	case "tracks":
		items, err = SavedTracksView(ctx, client)
		if err != nil {
			return nil, err
		}
	}
	m := mainModel{
		list:   list.New(items, list.NewDefaultDelegate(), 0, 0),
		ctx:    ctx,
		client: client,
		mode:   mode,
	}
	m.list.Title = "GOSPT"
	go m.Tick()
	m.list.AdditionalShortHelpKeys = func() []key.Binding {
		return []key.Binding{
			key.NewBinding(key.WithKeys("ctrl"+"r"), key.WithHelp("ctrl+r", "start radio")),
			key.NewBinding(key.WithKeys("d"), key.WithHelp("d", "select device")),
		}
	}
	return m, nil
}

func DeviceView(ctx *gctx.Context, client *spotify.Client) ([]list.Item, error) {
	items := []list.Item{}
	devices, err := client.PlayerDevices(ctx)
	if err != nil {
		return nil, err
	}
	for _, device := range devices {
		items = append(items, mainItem{
			Name:   device.Name,
			Desc:   fmt.Sprintf("%s - active: %t", device.ID, device.Active),
			Device: device,
		})
	}
	return items, nil
}

func HandleSetDevice(ctx *gctx.Context, client *spotify.Client, player spotify.PlayerDevice) {
	fmt.Println("WHOA")
	var err error
	err = commands.SetDevice(ctx, client, player)
	if err != nil {
		fmt.Println(err.Error())
		os.Exit(1)
	}
}