package GameEngine

import ("github.com/veandco/go-sdl2/sdl"
    "github.com/ByteArena/box2d")

type graphicsInterface struct {
    window        *sdl.Window
    renderer      *sdl.Renderer
}

func (r *graphicsInterface) LoadImage(path string) (Sprite){
    i, _ := sdl.LoadBMP("./assets/images/test1.bmp")
    image, _ := r.renderer.CreateTextureFromSurface(i)
    _, _, width, height, _ := image.Query()
    rect := &sdl.Rect{0, 0, width, height}
    bodyDef := box2d.MakeB2BodyDef()
    bodyDef.Position.Set(0, -10)
    body := World.CreateBody(&bodyDef)
    shape := box2d.MakeB2CircleShape()
    shape.B2Shape.M_radius = 0.5
    body.CreateFixture(shape, 0.0)

    return Sprite{image, rect, body}
}

func (r *graphicsInterface) Blit(sprite Sprite) {
    r.renderer.Copy(sprite.Texture, nil, sprite.Rect)
}

func (r *graphicsInterface) Flip() {
    r.renderer.Present()
    r.renderer.Clear()
}

func (r *graphicsInterface) Destroy() {
    r.renderer.Destroy()
    r.window.Destroy()
    sdl.Quit()
}

func CreateGraphicsInterface(fullscreen bool) (graphicsInterface){
    gi := graphicsInterface{}
    const windowTitle string = "GoGame"
    var windowFlags uint32 = uint32(sdl.WINDOW_SHOWN)
    if fullscreen {
        windowFlags = windowFlags | uint32(sdl.WINDOW_FULLSCREEN_DESKTOP)
    }

    window, _ := sdl.CreateWindow(windowTitle, 0, 0, 0, 0, windowFlags)
    renderer, _ := sdl.CreateRenderer(window, -1, sdl.RENDERER_PRESENTVSYNC)

    gi = graphicsInterface{window: window, renderer: renderer}

    return gi
}

type Sprite struct {
    Texture *sdl.Texture
    Rect *sdl.Rect
    Body *box2d.B2Body
}