// Package
package main

// Libraries
import (
	"fmt"
	"log"
	"runtime"

	"github.com/go-gl/gl/v2.1/gl"
	"github.com/go-gl/glfw/v3.3/glfw"
)

// Structures
type Window struct {
	title         string
	width, height int
	window        *glfw.Window
}

// Interfaces
func (w *Window) Init(title string, _w int, _h int) {
	// Setting variables
	w.title = title
	w.width = _w
	w.height = _h

	// DBEUG
	fmt.Println(": ENGINE STARTING")

	// Locking thread
	runtime.LockOSThread()

	// Starting GLFW
	err := glfw.Init()
	if err != nil {
		panic(err)
	}

	// Creating a window
	w.window, err = glfw.CreateWindow(w.width, w.height, w.title, nil, nil)
	if err != nil {
		panic(err)
	}
	w.window.MakeContextCurrent()

	// Staring OpenGL
	if err := gl.Init(); err != nil {
		log.Fatalln(err)
	}

	gl.ClearColor(0, 0, 0, 1)
}
func (w *Window) Run(execute func(w *Window)) {
	for !w.window.ShouldClose() {
		w.window.SwapBuffers()
		glfw.PollEvents()
		gl.Clear(gl.COLOR_BUFFER_BIT)
		execute(w)
	}
}
func (w *Window) Stop() {
	glfw.Terminate()
}