package widgets

import (
	"fyne.io/fyne/v2"
	"fyne.io/fyne/v2/container"
	"fyne.io/fyne/v2/widget"
	fynelyrics "github.com/dweymouth/fyne-lyrics"
	"github.com/dweymouth/supersonic/backend/mediaprovider"
)

type LyricsViewer struct {
	widget.BaseWidget

	noLyricsLabel widget.Label
	viewer        *fynelyrics.LyricsViewer

	container *fyne.Container
	isEmpty   bool
}

func NewLyricsViewer() *LyricsViewer {
	l := &LyricsViewer{noLyricsLabel: widget.Label{
		Text: "Lyrics not available",
	}, isEmpty: true}
	l.ExtendBaseWidget(l)
	l.container = container.NewStack(&l.noLyricsLabel)
	return l
}

func (l *LyricsViewer) SetLyrics(lyrics *mediaprovider.Lyrics) {
	if lyrics == nil || len(lyrics.Lines) == 0 {
		if !l.isEmpty {
			l.container.Objects[0] = &l.noLyricsLabel
			l.isEmpty = true
			l.Refresh()
		}
		return
	}

	if l.viewer == nil {
		l.viewer = fynelyrics.NewLyricsViewer()
		l.viewer.ActiveLyricPosition = fynelyrics.ActiveLyricPositionTopThird
	}
	lines := make([]string, len(lyrics.Lines))
	for i, line := range lyrics.Lines {
		lines[i] = line.Text
	}
	l.viewer.SetLyrics(lines, false /*synced*/)
	if l.isEmpty {
		l.container.Objects[0] = l.viewer
		l.isEmpty = false
		l.Refresh()
	}
}

func (l *LyricsViewer) CreateRenderer() fyne.WidgetRenderer {
	return widget.NewSimpleRenderer(l.container)
}