package fpscontrols

import (
	"github.com/go-gl/glfw/v3.3/glfw"
	"github.com/go-gl/mathgl/mgl32"
)

type FPSControls struct {
	lookSpeed float32
	moveSpeed float32

	position mgl32.Vec3
	rotation mgl32.Vec2

	currentMove  mgl32.Vec3
	currentLook  mgl32.Vec2
	lastMousePos mgl32.Vec2
}

var instance *FPSControls

func Get(lookSpeed, moveSpeed float32, position mgl32.Vec3, rotation mgl32.Vec2, window *glfw.Window) *FPSControls {
	if instance != nil {
		return instance
	}

	instance = &FPSControls{
		moveSpeed: moveSpeed,
		lookSpeed: lookSpeed,
		position:  position,
		rotation:  rotation,
	}

	window.SetKeyCallback(func(window *glfw.Window, key glfw.Key, scancode int, action glfw.Action, mods glfw.ModifierKey) {
		var val float32

		switch action {
		case glfw.Repeat:
			return
		case glfw.Press:
			val = 1
		case glfw.Release:
			val = 0
		}

		switch key {
		case glfw.KeyW:
			instance.currentMove[2] = -val
		case glfw.KeyS:
			instance.currentMove[2] = val
		case glfw.KeyA:
			instance.currentMove[0] = -val
		case glfw.KeyD:
			instance.currentMove[0] = val
		case glfw.KeySpace:
			instance.currentMove[1] = -val
		case glfw.KeyLeftShift:
			instance.currentMove[1] = val
		}
	})

	window.SetCursorPosCallback(func(window *glfw.Window, x float64, y float64) {
		pos := mgl32.Vec2{float32(x), float32(y)}
		instance.currentLook = instance.lastMousePos.Sub(pos)
		instance.lastMousePos = pos
	})

	return instance
}

func (c *FPSControls) forward() mgl32.Vec3 {

}

func (c *FPSControls) View() mgl32.Mat4 {

}