package tins2020

import (
	"math"
	"strconv"

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

type Dial struct {
	ui.ContainerBase

	dialer Dialer

	typing     string      // current digit
	digitCount int         // number of times the digit is pressed
	digits     []DialDigit // digits
}

func NewDial(dialer Dialer) *Dial {
	dial := &Dial{dialer: dialer}
	dial.digits = make([]DialDigit, 10)

	for i := range dial.digits {
		j := i
		dial.digits[i].Value = strconv.Itoa(i)
		dial.digits[i].ControlClicked().AddHandler(func(ctx ui.Context, _ ui.ControlClickedArgs) {
			dial.userTyped(ctx, j)
		})
		dial.AddChild(&dial.digits[i])
	}
	return dial
}

func (d *Dial) userTyped(ctx ui.Context, i int) {
	d.digits[i].Blink()
	digit := strconv.Itoa(i)
	if len(d.typing) == 0 || digit != d.typing {
		d.typing = digit
		d.digitCount = 1
	} else {
		d.digitCount++
	}

	if !d.dialer.CanUserType(i) {
		d.typing = ""
		d.digitCount = 0
		d.dialer.UserGaveWrongInput()
	} else if d.digitCount == i || d.digitCount == 10 {
		d.typing = ""
		d.digitCount = 0
		d.dialer.UserTyped(ctx, i)
	}
}

func (d *Dial) Arrange(ctx ui.Context, bounds geom.RectangleF32, offset geom.PointF32, parent ui.Control) {
	d.ControlBase.Arrange(ctx, bounds, offset, parent)

	center := bounds.Center()
	size := bounds.Size()

	distance := size.Y * .3
	for i := range d.digits {
		angle := (float32((10-i)%10)*0.16 + .2) * math.Pi
		pos := geom.PtF32(distance*geom.Cos32(angle), .8*distance*geom.Sin32(angle))
		digitCenter := center.Add(pos)
		d.digits[i].Arrange(ctx, geom.RectRelF32(digitCenter.X-24, digitCenter.Y-24, 48, 48), offset, d)
	}
}

func (d *Dial) DesiredSize(ctx ui.Context, size geom.PointF32) geom.PointF32 {
	return geom.PtF32(size.X, geom.NaN32())
}

func (d *Dial) Handle(ctx ui.Context, event ui.Event) bool {
	if d.ContainerBase.Handle(ctx, event) {
		return true
	}
	switch e := event.(type) {
	case *ui.KeyDownEvent:
		switch e.Key {
		case ui.Key0:
			d.userTyped(ctx, 0)
		case ui.KeyPad0:
			d.userTyped(ctx, 0)
		case ui.Key1:
			d.userTyped(ctx, 1)
		case ui.KeyPad1:
			d.userTyped(ctx, 1)
		case ui.Key2:
			d.userTyped(ctx, 2)
		case ui.KeyPad2:
			d.userTyped(ctx, 2)
		case ui.Key3:
			d.userTyped(ctx, 3)
		case ui.KeyPad3:
			d.userTyped(ctx, 3)
		case ui.Key4:
			d.userTyped(ctx, 4)
		case ui.KeyPad4:
			d.userTyped(ctx, 4)
		case ui.Key5:
			d.userTyped(ctx, 5)
		case ui.KeyPad5:
			d.userTyped(ctx, 5)
		case ui.Key6:
			d.userTyped(ctx, 6)
		case ui.KeyPad6:
			d.userTyped(ctx, 6)
		case ui.Key7:
			d.userTyped(ctx, 7)
		case ui.KeyPad7:
			d.userTyped(ctx, 7)
		case ui.Key8:
			d.userTyped(ctx, 8)
		case ui.KeyPad8:
			d.userTyped(ctx, 8)
		case ui.Key9:
			d.userTyped(ctx, 9)
		case ui.KeyPad9:
			d.userTyped(ctx, 9)
		}
	}
	return false
}

func (d *Dial) Reset() {
	d.typing = ""
	d.digitCount = 0
}

func (d *Dial) Tick() {
	for i := range d.digits {
		d.digits[i].Tick()
	}
}