// Copyright 2019 Google Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

// Binary buttondemo shows the functionality of a button widget.
package main

import (
	"context"
	"fmt"
	"time"

	"github.com/mum4k/termdash"
	"github.com/mum4k/termdash/align"
	"github.com/mum4k/termdash/cell"
	"github.com/mum4k/termdash/container"
	"github.com/mum4k/termdash/linestyle"
	"github.com/mum4k/termdash/terminal/termbox"
	"github.com/mum4k/termdash/terminal/terminalapi"
	"github.com/mum4k/termdash/widgets/button"
	"github.com/mum4k/termdash/widgets/segmentdisplay"
)

func main() {
	t, err := termbox.New()
	if err != nil {
		panic(err)
	}
	defer t.Close()

	ctx, cancel := context.WithCancel(context.Background())

	val := 0
	display, err := segmentdisplay.New()
	if err != nil {
		panic(err)
	}
	if err := display.Write([]*segmentdisplay.TextChunk{
		segmentdisplay.NewChunk(fmt.Sprintf("%d", val)),
	}); err != nil {
		panic(err)
	}

	addB, err := button.New("(a)dd", func() error {
		val++
		return display.Write([]*segmentdisplay.TextChunk{
			segmentdisplay.NewChunk(fmt.Sprintf("%d", val)),
		})
	},
		button.GlobalKey('a'),
		button.WidthFor("(s)ubtract"),
	)
	if err != nil {
		panic(err)
	}

	subB, err := button.New("(s)ubtract", func() error {
		val--
		return display.Write([]*segmentdisplay.TextChunk{
			segmentdisplay.NewChunk(fmt.Sprintf("%d", val)),
		})
	},
		button.FillColor(cell.ColorNumber(220)),
		button.GlobalKey('s'),
	)
	if err != nil {
		panic(err)
	}

	c, err := container.New(
		t,
		container.Border(linestyle.Light),
		container.BorderTitle("PRESS Q TO QUIT"),
		container.SplitHorizontal(
			container.Top(
				container.PlaceWidget(display),
			),
			container.Bottom(
				container.SplitVertical(
					container.Left(
						container.PlaceWidget(addB),
						container.AlignHorizontal(align.HorizontalRight),
					),
					container.Right(
						container.PlaceWidget(subB),
						container.AlignHorizontal(align.HorizontalLeft),
					),
				),
			),
			container.SplitPercent(60),
		),
	)
	if err != nil {
		panic(err)
	}

	quitter := func(k *terminalapi.Keyboard) {
		if k.Key == 'q' || k.Key == 'Q' {
			cancel()
		}
	}

	if err := termdash.Run(ctx, t, c, termdash.KeyboardSubscriber(quitter), termdash.RedrawInterval(100*time.Millisecond)); err != nil {
		panic(err)
	}
}