package shapes

import (
	"gioutils/internal"
	"gioutils/points"
	"image"
	"image/color"

	"gioui.org/layout"
	"gioui.org/op/clip"
	"gioui.org/op/paint"
)

type Rectangle struct {
	color color.NRGBA
	min   image.Point
	max   image.Point
}

// RectangleFromPoints returns a new Rectangle based on two corner points.
func RectangleFromPoints(min image.Point, max image.Point) *Rectangle {
	return &Rectangle{
		color: internal.DefaultBgColor,
		min:   min,
		max:   max,
	}
}

// RectangleFromCenter returns a new Rectangle based on a central point and a given apothem.
func RectangleFromCenter(center image.Point, apothem int) *Rectangle {
	min, max := points.CenterSquare(center, apothem)
	return &Rectangle{
		color: internal.DefaultBgColor,
		min:   min,
		max:   max,
	}
}

// Color sets the color of the Rectangle.
func (r *Rectangle) Color(color color.NRGBA) *Rectangle {
	r.color = color
	return r
}

// Draw returns the Rectangle widget.
func (r *Rectangle) Draw() layout.Widget {
	return func(gtx layout.Context) layout.Dimensions {
		rect := clip.Rect{
			Min: r.min,
			Max: r.max,
		}.Op()
		paint.FillShape(gtx.Ops, r.color, rect)

		width := r.max.X - r.min.X
		height := r.max.Y - r.min.Y

		return layout.Dimensions{Size: image.Pt(width, height)}
	}
}