package testing

import "image"
import "image/color"
import "git.tebibyte.media/sashakoshka/tomo"
import "git.tebibyte.media/sashakoshka/tomo/theme"
import "git.tebibyte.media/sashakoshka/tomo/artist"
import "git.tebibyte.media/sashakoshka/tomo/elements/core"

// Mouse is an element capable of testing mouse input. When the mouse is clicked
// and dragged on it, it draws a trail.
type Mouse struct {
	*core.Core
	core core.CoreControl
	drawing      bool
	color        artist.Pattern
	lastMousePos image.Point
}

// NewMouse creates a new mouse test element.
func NewMouse () (element *Mouse) {
	element = &Mouse { }
	element.Core, element.core = core.NewCore(element)
	element.core.SetMinimumSize(32, 32)
	element.color = artist.NewUniform(color.Black)
	return
}

func (element *Mouse) Resize (width, height int) {
	element.core.AllocateCanvas(width, height)
	bounds := element.Bounds()
	artist.FillRectangle (
		element.core,
		theme.AccentPattern(),
		bounds)
	artist.StrokeRectangle (
		element.core,
		artist.NewUniform(color.Black), 1,
		bounds)
	artist.Line (
		element.core, artist.NewUniform(color.White), 1,
		image.Pt(1, 1),
		image.Pt(bounds.Dx() - 2, bounds.Dy() - 2))
	artist.Line (
		element.core, artist.NewUniform(color.White), 1,
		image.Pt(1, bounds.Dy() - 2),
		image.Pt(bounds.Dx() - 2, 1))
}

func (element *Mouse) HandleMouseDown (x, y int, button tomo.Button) {
	element.drawing = true
	element.lastMousePos = image.Pt(x, y)
}

func (element *Mouse) HandleMouseUp (x, y int, button tomo.Button) {
	element.drawing = false
	mousePos := image.Pt(x, y)
	element.core.DamageRegion (artist.Line (
		element.core, element.color, 1,
		element.lastMousePos, mousePos))
	element.lastMousePos = mousePos
}

func (element *Mouse) HandleMouseMove (x, y int) {
	if !element.drawing { return }
	mousePos := image.Pt(x, y)
	element.core.DamageRegion (artist.Line (
		element.core, element.color, 1,
		element.lastMousePos, mousePos))
	element.lastMousePos = mousePos
}

func (element *Mouse) HandleMouseScroll (x, y int, deltaX, deltaY float64) { }