package shapes

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

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

type Circle struct {
	color  color.NRGBA
	min    image.Point
	max    image.Point
	radius int
}

// CircleFromPoints returns a new Circle based on two rectangular corners.
func CircleFromPoints(min image.Point, max image.Point) *Circle {
	return &Circle{
		color: internal.DefaultBgColor,
		min:   min,
		max:   max,
	}
}

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

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

// Draw returns the Circle widget.
func (c *Circle) Draw() layout.Widget {
	return func(gtx layout.Context) layout.Dimensions {
		circle := clip.Ellipse{
			Min: c.min,
			Max: c.max,
		}.Op(gtx.Ops)
		paint.FillShape(gtx.Ops, c.color, circle)

		// width := c.max.X - c.min.X
		// height := c.max.Y - c.min.Y

		diameter := c.radius * 2
		return layout.Dimensions{Size: image.Pt(diameter, diameter)}
	}
}