package renderer

import (
	"log"

	"github.com/go-gl/gl/v4.1-core/gl"
)

type Renderer struct {
	clearColor [4]float32
}

func NewRenderer() *Renderer {
	return &Renderer{
		clearColor: [4]float32{0.1, 0.1, 0.1, 0.1},
	}
}

func (r *Renderer) Init() error {
	if err := gl.Init(); err != nil {
		return err
	}

	gl.Enable(gl.DEPTH_TEST)
	gl.Enable(gl.BLEND)
	gl.BlendFunc(gl.SRC_ALPHA, gl.ONE_MINUS_SRC_ALPHA)

	version := gl.GoStr(gl.GetString(gl.VERSION))
	log.Println("OpenGL version:", version)

	return nil
}

func (r *Renderer) Clear() {
	gl.ClearColor(r.clearColor[0], r.clearColor[1], r.clearColor[2], r.clearColor[3])
	gl.Clear(gl.COLOR_BUFFER_BIT | gl.DEPTH_BUFFER_BIT)
}

func (r *Renderer) SetClearColor(rgba [4]float32) {
	r.clearColor = rgba
}

func (r *Renderer) SetViewport(x, y, width, height int32) {
	gl.Viewport(x, y, width, height)
}