package ui

import rl "github.com/gen2brain/raylib-go/raylib"

// An element that can use another element as a background
type StackedElement interface {
	// Returns an applied style
	GetStyle() *Style

	// Returns a background element. Should return nil if it is not uupposed to be drawn
	GetBackgroundElement() UIElement
}

func drawStackedElementBackground(base StackedElement, targetPosition *rl.Rectangle) {
	var bgElement = base.GetBackgroundElement()
	if bgElement == nil {
		_drawSimpleBackground(base.GetStyle(), targetPosition)
	} else {
		_drawElement(bgElement, targetPosition)
	}
}

func _drawSimpleBackground(style *Style, trg *rl.Rectangle) {
	rl.DrawRectangleRounded(*trg,
		*style.Roundness,
		0, // Assume the segments param is always 0 - it doesn't really matter without a border
		*style.BacgroundColor)
}

// Should not be used outside of the scope of this file
func _drawElement(elem UIElement, trg *rl.Rectangle) {
	elem.Draw(trg)
}