package main

import (
	"github.com/gdamore/tcell"
	"github.com/rivo/tview"
)

func main() {

	app := tview.NewApplication()

	start(app)

}


func start(app *tview.Application) {
	// override default border
	// change double line border to one line border when focused
	tview.Borders.HorizontalFocus = tview.Borders.Horizontal
	tview.Borders.VerticalFocus = tview.Borders.Vertical
	tview.Borders.TopLeftFocus = tview.Borders.TopLeft
	tview.Borders.TopRightFocus = tview.Borders.TopRight
	tview.Borders.BottomLeftFocus = tview.Borders.BottomLeft
	tview.Borders.BottomRightFocus = tview.Borders.BottomRight
	tview.Styles.PrimitiveBackgroundColor = tcell.ColorDefault
	tview.Styles.BorderColor = tcell.ColorAntiqueWhite

	child3 := NowPlayingBar()
	child2 := Queue(child3)
	child1 := playlist(child2)

	flex := Layout(app, child1, child2, child3)

	pages := tview.NewPages().AddPage("main", flex, true, true)

	childrens := []Children{child1, child2, child3}

	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {

		switch event.Key() {
		// cycle through each section
		case tcell.KeyTAB:
			cycleChildren(app, childrens)

		}

		switch event.Rune() {
		case 'q':
			
			confirmationPopup(app, pages, "Are you sure to exit?", func (_ int, label string) {
				
				if label == "yes" {
					app.Stop()
				} else {
					pages.RemovePage("confirmation-popup")
				}

			})

		}

		return event
	})


	// fix transparent background issue
	app.SetBeforeDrawFunc(func(screen tcell.Screen) bool {
		screen.Clear()
		return false
	})

	// main loop
	if err := app.SetRoot(pages, true).SetFocus(flex).Run(); err != nil {
		panic(err)
	}
}



// created so we can keep track of childrens in slices
type Children interface {
	HasFocus() bool
	SetBorderColor(color tcell.Color) *tview.Box
	SetTitleColor(color tcell.Color) *tview.Box
	SetTitle(s string) *tview.Box
	GetTitle() string
}

func cycleChildren(app *tview.Application, childrens []Children) {

	focusedColor := tcell.ColorDarkCyan
	unfocusedColor := tcell.ColorAntiqueWhite
	anyChildHasFocus := false

	for i, child := range childrens {

		if child.HasFocus() {

			anyChildHasFocus = true

			var nextChild Children

			// if its the last element set the child back to one
			if i == len(childrens) - 1 {
				nextChild = childrens[0]
			} else {
				nextChild = childrens[i + 1]
			}


			child.SetBorderColor(unfocusedColor)	
			child.SetTitleColor(unfocusedColor)

			app.SetFocus(nextChild.(tview.Primitive))
			nextChild.SetBorderColor(focusedColor)
			nextChild.SetTitleColor(focusedColor)

			break
		}
	}

	if anyChildHasFocus == false {
		
		app.SetFocus(childrens[0].(tview.Primitive))
		childrens[0].SetBorderColor(focusedColor)
		childrens[0].SetTitleColor(focusedColor)
	}

}