package views

import (
	"fmt"
	"strconv"
	"time"

	"git.dayanhub.com/sagi/subsonic-tui/internal/client"
	"git.dayanhub.com/sagi/subsonic-tui/internal/common"
	"git.dayanhub.com/sagi/subsonic-tui/internal/config"
	"github.com/delucks/go-subsonic"
	"github.com/gdamore/tcell/v2"
	"github.com/rivo/tview"
)

var _ View = &main{}

type mainviewmode int

const (
	mainModeAlbum    mainviewmode = iota
	mainModePlaylist mainviewmode = iota
	mainModeArtist   mainviewmode = iota
	mainModeSearch   mainviewmode = iota
)

type main struct {
	view         *tview.Flex
	client       *client.Client
	mode         mainviewmode
	query        string
	miniView     bool
	album        *subsonic.AlbumID3
	searchResult *subsonic.SearchResult3
	playlist     *subsonic.Playlist
	songList     *tview.Table
	artist       *subsonic.ArtistID3
	artistInfo   *subsonic.ArtistInfo2
	playAllFunc  func(song ...*subsonic.Child)
	addSongsFunc func(song ...*subsonic.Child)
	log          func(format string, a ...any)
}

func NewMainView(client *client.Client, log func(format string, a ...any)) *main {
	playlistAlbum := &main{
		client: client,
		log:    log,
	}

	flex := tview.NewFlex().SetDirection(tview.FlexRow)

	flex.SetBackgroundColor(config.ColorBackground)
	flex.SetTitle("Subsonic TUI [`]")
	flex.SetBorder(true)
	flex.SetFocusFunc(func() {
		flex.SetBorderColor(config.ColorSelectedBoarder)

		if playlistAlbum.songList != nil {
			// playlistAlbum.view.Blur()
			playlistAlbum.songList.Focus(nil)
		}
	})
	flex.SetBlurFunc(func() {
		flex.SetBorderColor(config.ColorBluredBoarder)

		if playlistAlbum.songList != nil {
			playlistAlbum.songList.Blur()
		}
	})

	playlistAlbum.view = flex
	// Empty Box for starters...
	playlistAlbum.view.AddItem(EmptyBox, 0, 1, false)

	return playlistAlbum
}

func (m *main) SetMiniView(mini bool) {
	m.miniView = mini
}

func (m *main) SetAlbum(album *subsonic.AlbumID3) {
	m.mode = mainModeAlbum
	m.album = album
	m.Update()
	m.log("")
}

func (m *main) SetPlaylist(playlist *subsonic.Playlist) {
	m.mode = mainModePlaylist
	m.playlist = playlist
	m.Update()
	m.log("")
}

func (m *main) SetArtist(artist *subsonic.ArtistID3) {
	m.mode = mainModeArtist
	m.artist = artist
	info, _ := m.client.GetArtistInfo(artist.ID)
	m.artistInfo = info
	m.Update()
	m.log("")
}

func (m *main) SetSearch(result *subsonic.SearchResult3, query string) {
	m.mode = mainModeSearch
	m.searchResult = result
	m.query = query
	m.Update()
	m.log("Found #%d artists, #%d albums and #%d songs",
		len(result.Artist),
		len(result.Album),
		len(result.Song),
	)
}

func (m *main) drawPlaylist() {
	subtitle := fmt.Sprintf("%s\n\nCreated by: %s | %s", m.playlist.Comment,
		m.playlist.Owner, time.Duration(m.playlist.Duration*int(time.Second)).String())
	m.populateHeader(m.playlist.Name, subtitle, m.playlist.Duration, m.playlist.CoverArt)

	playBtn := m.drawPlaylistAlbumButtons(m.playlist.Entry)

	m.populateSongs(m.playlist.Entry, playBtn)
}

func (m *main) drawAlbum() {
	subtitle := fmt.Sprintf("%s\n\n%d | %s", m.album.Artist, m.album.Year,
		time.Duration(m.album.Duration*int(time.Second)).String())
	m.populateHeader(m.album.Name, subtitle, m.album.Duration, m.album.CoverArt)

	playBtn := m.drawPlaylistAlbumButtons(m.album.Song)

	m.populateSongs(m.album.Song, playBtn)
}

func (m *main) drawArtist() {
	m.populateHeader(m.artist.Name, m.artistInfo.Biography, 0, m.artist.CoverArt)

	btn := m.drawArtistButtons()

	m.populateAlbums(btn)
}

func (m *main) drawSearch() {
	sub := "Query: " + m.query

	m.populateHeader("Search Results", sub, 0, "")
	m.populateSearchResults()
}

func (m *main) Update() {
	m.view.Clear()

	switch m.mode {
	case mainModeAlbum:
		m.drawAlbum()
	case mainModePlaylist:
		m.drawPlaylist()
	case mainModeArtist:
		m.drawArtist()
	case mainModeSearch:
		m.drawSearch()
	}

	m.songList.Focus(nil)
}

func (m *main) drawArtistButtons() *tview.Button {
	// Add buttons: Radio
	topSongs := 10
	songs, _ := m.client.GetTopSongs(m.artist.Name, topSongs)
	f := tview.NewFlex()
	f.SetBackgroundColor(config.ColorBackground)
	f.SetBorderPadding(0, 0, 2, 2)
	// Buttons
	radio := NewButton("Radio")
	top10 := NewButton("Top 10")
	// Button callbacks
	top10.SetSelectedFunc(func() {
		top10.Blur()
		m.log("Playing %s's top 10 songs", m.artist.Name)
		m.playAllFunc(songs...)
		m.songList.Focus(nil)
	})
	radio.SetSelectedFunc(func() {
		radio.Blur()
		m.log("Generating %s's radio", m.artist.Name)

		go func() {
			radioSongs := []*subsonic.Child{}
			if config.ExperimentalRadioAlgo() {
				radioSongs, _ = m.client.GetExperimentalArtistRadio(m.artist, m.artistInfo, config.MaxRadioSongs())
			}

			if len(radioSongs) == 0 {
				radioSongs, _ = m.client.GetSimilarSongs(m.artist.ID, config.MaxRadioSongs())
			}

			common.ShuffleSlice(radioSongs)
			m.playAllFunc(radioSongs...)
		}()
		m.songList.Focus(nil)
	})
	radio.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyDown:
			radio.Blur()
			m.songList.Focus(nil)

			return nil
		case tcell.KeyRight:
			radio.Blur()
			top10.Focus(nil)

			return nil
		default:
			return event
		}
	})
	top10.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyDown:
			top10.Blur()
			m.songList.Focus(nil)

			return nil
		case tcell.KeyLeft:
			top10.Blur()
			radio.Focus(nil)

			return nil
		default:
			return event
		}
	})

	f.AddItem(radio, 0, 1, false)
	f.AddItem(EmptyBox, 0, 1, false)

	if len(songs) > 0 {
		f.AddItem(top10, 0, 1, false)
	}

	f.AddItem(EmptyBox, 0, 1, false)

	// Add the buttons to the view
	m.view.AddItem(f, 1, 0, false)
	// Margin bottom of 1 line
	m.view.AddItem(EmptyBox, 1, 0, false)

	return radio
}

func (m *main) populateAlbums(btn *tview.Button) {
	table := tview.NewTable()
	table.SetBackgroundColor(config.ColorBackground)
	table.SetWrapSelection(true, false)

	for i, album := range m.artist.Album {
		year := tview.NewTableCell(strconv.Itoa(album.Year)).SetTextColor(config.ColorTextAccent)
		name := tview.NewTableCell(album.Name).SetExpansion(2).SetAlign(tview.AlignCenter)
		d := time.Second * time.Duration(album.Duration)
		duration := tview.NewTableCell(d.String()).SetAlign(tview.AlignRight).SetExpansion(1)

		table.SetCell(i, 0, year)
		table.SetCell(i, 1, name)
		table.SetCell(i, 2, duration)
	}

	table.SetFocusFunc(func() {
		m.view.SetBorderColor(config.ColorSelectedBoarder)
		table.SetSelectable(true, false)
	})
	table.SetBlurFunc(func() {
		m.view.SetBorderColor(config.ColorBluredBoarder)
		table.SetSelectable(false, false)
	})
	table.SetSelectedFunc(func(row, column int) {
		alb, _ := m.client.GetAlbum(m.artist.Album[row].ID)
		m.SetAlbum(alb)
		m.view.Focus(nil)
	})
	table.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		row, _ := m.songList.GetSelection()
		if row == 0 && event.Key() == tcell.KeyUp {
			table.Blur()
			m.view.SetBorderColor(config.ColorSelectedBoarder)
			btn.Focus(nil)

			return nil
		}

		return event
	})

	m.songList = table

	m.view.AddItem(table, 0, 1, false)
}

func (m *main) drawPlaylistAlbumButtons(songs []*subsonic.Child) *tview.Button {
	// Add buttons: Play | Shuffle | Add to queue
	f := tview.NewFlex()
	f.SetBackgroundColor(config.ColorBackground)
	f.SetBorderPadding(0, 0, 2, 2)
	// Buttons
	play := NewButton("Play")
	shuffle := NewButton("Shuffle")
	queue := NewButton("Queue")
	artist := NewButton("Artist")
	// Button callbacks
	play.SetSelectedFunc(func() {
		play.Blur()
		m.playAllFunc(songs...)
		m.songList.Focus(nil)
	})
	play.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyLeft:
			play.Blur()
			artist.Focus(nil)

			return nil
		case tcell.KeyRight:
			play.Blur()
			shuffle.Focus(nil)

			return nil
		case tcell.KeyDown:
			play.Blur()
			m.songList.Focus(nil)

			return nil
		default:
			return event
		}
	})
	shuffle.SetSelectedFunc(func() {
		shuffle.Blur()

		cpy := make([]*subsonic.Child, len(songs))
		copy(cpy, songs)
		common.ShuffleSlice(cpy)
		m.playAllFunc(cpy...)
		m.songList.Focus(nil)
	})
	shuffle.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyLeft:
			shuffle.Blur()
			play.Focus(nil)

			return nil
		case tcell.KeyRight:
			shuffle.Blur()
			queue.Focus(nil)

			return nil
		case tcell.KeyDown:
			shuffle.Blur()
			m.songList.Focus(nil)

			return nil
		default:
			return event
		}
	})
	queue.SetSelectedFunc(func() {
		queue.Blur()
		m.addSongsFunc(songs...)
		m.songList.Focus(nil)
	})
	queue.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyLeft:
			queue.Blur()
			shuffle.Focus(nil)

			return nil
		case tcell.KeyRight:
			queue.Blur()
			artist.Focus(nil)

			return nil
		case tcell.KeyDown:
			queue.Blur()
			m.songList.Focus(nil)

			return nil
		default:
			return event
		}
	})
	artist.SetSelectedFunc(func() {
		artist.Blur()

		ar, _ := m.client.GetArtist(m.album.ArtistID)
		m.SetArtist(ar)
		m.songList.Focus(nil)
	})
	artist.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		switch event.Key() {
		case tcell.KeyLeft:
			artist.Blur()
			queue.Focus(nil)

			return nil
		case tcell.KeyRight:
			artist.Blur()
			play.Focus(nil)

			return nil
		case tcell.KeyDown:
			artist.Blur()
			m.songList.Focus(nil)

			return nil
		}

		return event
	})

	f.AddItem(play, 0, 1, true)
	f.AddItem(EmptyBox, 0, 1, false)
	f.AddItem(shuffle, 0, 1, false)
	f.AddItem(EmptyBox, 0, 1, false)
	f.AddItem(queue, 0, 1, false)
	f.AddItem(EmptyBox, 0, 1, false)
	f.AddItem(artist, 0, 1, false)

	// Add the buttons to the view
	m.view.AddItem(f, 1, 0, false)
	// Margin bottom of 1 line
	m.view.AddItem(EmptyBox, 1, 0, false)

	return play
}

func (m *main) populateSongs(songs []*subsonic.Child, play *tview.Button) {
	table := tview.NewTable()
	table.SetBackgroundColor(config.ColorBackground)
	table.SetWrapSelection(true, false)

	for i, song := range songs {
		num := tview.NewTableCell(strconv.Itoa(i + 1)).SetTextColor(config.ColorTextAccent)
		title := tview.NewTableCell(song.Title).SetMaxWidth(15).SetExpansion(2)
		artist := tview.NewTableCell(song.Artist).SetMaxWidth(15).SetExpansion(1)
		d := time.Second * time.Duration(song.Duration)
		duration := tview.NewTableCell(d.String()).SetAlign(tview.AlignRight).SetExpansion(1)

		table.SetCell(i, 0, num)
		table.SetCell(i, 1, title)
		table.SetCell(i, 2, artist)
		table.SetCell(i, 3, duration)
	}

	m.songList = table
	table.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		// on first line and pressing up -> play button
		row, _ := table.GetSelection()
		if row == 0 && event.Key() == tcell.KeyUp {
			table.Blur()
			m.view.SetBorderColor(config.ColorSelectedBoarder)
			play.Focus(nil)

			return nil
		} else if event.Rune() == 'r' {
			song := songs[row]
			m.log("Generating song (%s) radio....", song.Title)

			go func() {
				radioSongs, _ := m.client.GetSimilarSongs(song.ID, config.MaxRadioSongs())
				m.playAllFunc(radioSongs...)
			}()
		}

		return event
	})
	table.SetFocusFunc(func() {
		m.view.SetBorderColor(config.ColorSelectedBoarder)
		table.SetSelectable(true, false)
	})
	table.SetBlurFunc(func() {
		m.view.SetBorderColor(config.ColorBluredBoarder)
		table.SetSelectable(false, false)
	})
	m.songList.SetSelectedFunc(func(row, column int) {
		m.addSongsFunc(songs[row])
	})

	m.view.AddItem(table, 0, 1, false)
}

func (m *main) populateSearchResults() {
	table := tview.NewTable()
	table.SetBackgroundColor(config.ColorBackground)
	table.SetWrapSelection(true, false)

	row := 0
	lastArtist := 0
	lastAlbum := 0

	// Artists
	if len(m.searchResult.Artist) > 0 {
		// Header
		header := tview.NewTableCell("Artists").SetSelectable(false)
		table.SetCell(row, 0, header)

		row++
		// List
		for i, artist := range m.searchResult.Artist {
			index := tview.NewTableCell(strconv.Itoa(i + 1)).
				SetTextColor(config.ColorTextAccent)
			a := tview.NewTableCell(artist.Name).SetExpansion(2).SetMaxWidth(15)
			count := tview.NewTableCell(fmt.Sprintf("%d Albums", artist.AlbumCount)).
				SetExpansion(1).SetAlign(tview.AlignRight).SetMaxWidth(15)

			table.SetCell(row, 0, index)
			table.SetCell(row, 1, a)
			table.SetCell(row, 2, count)

			row++
		}

		lastArtist = row
	}

	// Albums

	if len(m.searchResult.Album) > 0 {
		// Header
		header := tview.NewTableCell("Albums").SetSelectable(false)
		table.SetCell(row, 0, header)

		row++
		// List
		for i, album := range m.searchResult.Album {
			index := tview.NewTableCell(strconv.Itoa(i + 1)).
				SetTextColor(config.ColorTextAccent)
			title := tview.NewTableCell(album.Name).SetExpansion(2).SetMaxWidth(15)
			artist := tview.NewTableCell(album.Artist).
				SetExpansion(1).SetAlign(tview.AlignRight).SetMaxWidth(15)

			table.SetCell(row, 0, index)
			table.SetCell(row, 1, title)
			table.SetCell(row, 2, artist)

			row++
		}

		lastAlbum = row
	}
	// Songs
	if len(m.searchResult.Song) > 0 {
		// Header
		header := tview.NewTableCell("Songs").SetSelectable(false)
		table.SetCell(row, 0, header)

		row++
		// List
		for i, song := range m.searchResult.Song {
			index := tview.NewTableCell(strconv.Itoa(i + 1)).
				SetTextColor(config.ColorTextAccent)
			title := tview.NewTableCell(song.Title).SetExpansion(2).SetMaxWidth(15)
			artist := tview.NewTableCell(song.Artist).
				SetExpansion(1).SetAlign(tview.AlignRight).SetMaxWidth(15)

			table.SetCell(row, 0, index)
			table.SetCell(row, 1, title)
			table.SetCell(row, 2, artist)

			row++
		}
	}

	m.songList = table
	table.SetFocusFunc(func() {
		m.view.SetBorderColor(config.ColorSelectedBoarder)
		table.SetSelectable(true, false)
	})
	table.SetBlurFunc(func() {
		m.view.SetBorderColor(config.ColorBluredBoarder)
		table.SetSelectable(false, false)
	})
	table.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
		row, _ := table.GetSelection()
		if row <= lastAlbum {
			return event
		}

		if event.Rune() != 'r' {
			return event
		}

		cell := table.GetCell(row, 0)

		index, err := strconv.Atoi(cell.Text)
		if err != nil {
			return nil
		}

		song := m.searchResult.Song[index-1]
		m.log("Generating song (%s) radio....", song.Title)

		go func() {
			radioSongs, _ := m.client.GetSimilarSongs(song.ID, config.MaxRadioSongs())
			m.playAllFunc(radioSongs...)
		}()

		return nil
	})
	m.songList.SetSelectedFunc(func(row, column int) {
		cell := table.GetCell(row, 0)

		index, err := strconv.Atoi(cell.Text)
		if err != nil {
			return
		}

		if row <= lastArtist {
			artist, _ := m.client.GetArtist(m.searchResult.Artist[index-1].ID)
			m.SetArtist(artist)
		} else if lastArtist < row && row <= lastAlbum {
			album, _ := m.client.GetAlbum(m.searchResult.Album[index-1].ID)
			m.SetAlbum(album)
		} else {
			m.addSongsFunc(m.searchResult.Song[index-1])
		}
	})

	m.view.AddItem(table, 0, 1, false)
}

func (m *main) populateHeader(title, subtitle string,
	duration int, coverArtID string,
) {
	_ = duration
	header := tview.NewFlex()
	header.SetBackgroundColor(config.ColorBackground)

	art := tview.NewImage()
	art.SetBackgroundColor(config.ColorBackground)

	img, _ := m.client.GetCoverArt(coverArtID)
	art.SetImage(img)

	t := tview.NewTextView().
		SetTextColor(config.ColorTextAccent).
		SetTextAlign(tview.AlignCenter).
		SetText(title)
	t.SetBackgroundColor(config.ColorBackground)
	s := tview.NewTextView().
		SetTextColor(config.ColorText).
		SetTextAlign(tview.AlignCenter).
		SetText(subtitle).SetWordWrap(true)
	s.SetBackgroundColor(config.ColorBackground)

	g := tview.NewFlex().SetDirection(tview.FlexRow)
	g.SetBackgroundColor(config.ColorBackground)
	g.AddItem(EmptyBox, 1, 1, false)
	g.AddItem(t, 1, 1, false)
	g.AddItem(s, 0, 1, false)

	header.AddItem(art, 0, 1, false)
	header.AddItem(g, 0, 3, false)

	size := 6
	if m.miniView {
		size = 4
	}

	m.view.AddItem(header, size, 1, false)

	// Margin bottom of 1 line
	if !m.miniView {
		m.view.AddItem(EmptyBox, 1, 0, false)
	}
}

func (m *main) SetPlayAllFunc(f func(song ...*subsonic.Child)) {
	m.playAllFunc = f
}

func (m *main) SetPlayAddSongFunc(f func(song ...*subsonic.Child)) {
	m.addSongsFunc = f
}

func (m *main) GetView() tview.Primitive {
	return m.view
}