package tins2020

import (
	"opslag.de/schobers/geom"
	"opslag.de/schobers/zntg"
	"opslag.de/schobers/zntg/ui"
)

type confirmationDialog struct {
	ui.Proxy

	active   string
	cancel   ui.Button
	confirm  ui.Button
	question ui.Paragraph

	userDecided ui.Events
}

func newConfirmationDialog(caption, question string) *confirmationDialog {
	dialog := &confirmationDialog{}

	dialog.active = "confirm"
	dialog.cancel.Text = "Cancel"
	dialog.cancel.ButtonClicked().AddHandler(func(ctx ui.Context, _ ui.ControlClickedArgs) { dialog.userCanceled(ctx) })
	dialog.cancel.Type = ui.ButtonTypeText
	dialog.cancel.HoverColor = zntg.MustHexColor(`FFFFFF1F`)
	dialog.confirm.Text = "OK"
	dialog.confirm.ButtonClicked().AddHandler(func(ctx ui.Context, _ ui.ControlClickedArgs) { dialog.userConfirmed(ctx) })
	dialog.confirm.Type = ui.ButtonTypeText
	dialog.confirm.HoverColor = zntg.MustHexColor(`FFFFFF1F`)
	dialog.question.Text = question
	dialog.updateActive()

	responses := ui.BuildStackPanel(ui.OrientationHorizontal, func(p *ui.StackPanel) {
		p.AddChild(ui.FixedWidth(&dialog.cancel, 160))
		p.AddChild(ui.FixedWidth(&dialog.confirm, 160))
	})

	content := &dialogBase{}
	content.Background = zntg.MustHexColor(`#0000007F`)
	content.Init(caption, ui.BuildStackPanel(ui.OrientationVertical, func(p *ui.StackPanel) {
		p.AddChild(&dialog.question)
		p.AddChild(responses)
	}))

	dialog.Content = ui.Background(ui.BuildSpacing(content, func(s *ui.Spacing) {
		s.Width = ui.Fixed(320)
		s.Center()
	}), zntg.MustHexColor(`#0000007F`))

	return dialog
}

func (d *confirmationDialog) toggleActive() {
	if d.active == "confirm" {
		d.active = "cancel"
	} else {
		d.active = "confirm"
	}
	d.updateActive()
}

func (d *confirmationDialog) updateActive() {
	d.cancel.Background = nil
	d.confirm.Background = nil
	switch d.active {
	case "cancel":
		d.cancel.Background = hoverTransparentColor
	case "confirm":
		d.confirm.Background = hoverTransparentColor
	}
}

func (d *confirmationDialog) userCanceled(ctx ui.Context) {
	d.userDecided.Notify(ctx, false)
}

func (d *confirmationDialog) userConfirmed(ctx ui.Context) {
	d.userDecided.Notify(ctx, true)
}

func (d *confirmationDialog) Handle(ctx ui.Context, e ui.Event) bool {
	if d.Proxy.Handle(ctx, e) {
		return true
	}
	switch e := e.(type) {
	case *ui.MouseButtonDownEvent:
		if e.Button == ui.MouseButtonRight {
			d.userCanceled(ctx)
			return true
		}
	case *ui.MouseMoveEvent:
		if d.cancel.IsOver() {
			d.active = "cancel"
		}
		if d.confirm.IsOver() {
			d.active = "confirm"
		}
		d.updateActive()
	case *ui.KeyDownEvent:
		switch e.Key {
		case ui.KeyEscape:
			d.userCanceled(ctx)
			return true
		case ui.KeyEnter:
			switch d.active {
			case "cancel":
				d.userCanceled(ctx)
			case "confirm":
				d.userConfirmed(ctx)
			}
			return true
		case ui.KeyLeft:
			d.toggleActive()
		case ui.KeyRight:
			d.toggleActive()
		case ui.KeyTab:
			d.toggleActive()
		}
	}
	return false
}

type dialogBase struct {
	ui.StackPanel

	caption ui.Label
	content ui.Proxy
}

func (d *dialogBase) DesiredSize(ctx ui.Context, size geom.PointF32) geom.PointF32 {
	return d.StackPanel.DesiredSize(ctx, size)
}

func (d *dialogBase) Init(caption string, content ui.Control) {
	d.caption.Text = caption
	d.content.Content = content
	d.Children = []ui.Control{&d.caption, &d.content}
}