package graphics

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

type Context struct {
	w, h     int32
	window   *sdl.Window
	renderer *sdl.Renderer
}

func (c Context) Width() int32 {
	return c.w
}

func (c Context) Height() int32 {
	return c.h
}

func (c Context) DrawLine(x1 int32, y1 int32, x2 int32, y2 int32, colorIndex byte) {
	color := Palette[colorIndex]
	c.renderer.SetDrawColor(color.R, color.G, color.B, color.A)
	c.renderer.DrawLine(x1, y1, x2, y2)
}

func (c Context) DrawRect(x, y, w, h int32, colorIndex byte) {
	color := Palette[colorIndex]
	c.renderer.SetDrawColor(color.R, color.G, color.B, color.A)
	c.renderer.FillRect(&sdl.Rect{
		X: x,
		Y: y,
		W: w,
		H: h,
	})
}

func (c Context) Sync() {
	c.renderer.Present()
}

func (c Context) Exit() {
	c.window.Destroy()
	c.renderer.Destroy()
	sdl.Quit()
}

func Init(title string, w, h int32) (*Context, error) {
	if err := sdl.Init(sdl.INIT_VIDEO); err != nil {
		return nil, err
	}
	window, err := sdl.CreateWindow(title, sdl.WINDOWPOS_UNDEFINED, sdl.WINDOWPOS_UNDEFINED, w, h, sdl.WINDOW_SHOWN)
	if err != nil {
		return nil, err
	}
	renderer, err := sdl.CreateRenderer(window, -1, sdl.RENDERER_SOFTWARE)
	if err != nil {
		return nil, err
	}
	return &Context{
		w:        w,
		h:        h,
		window:   window,
		renderer: renderer,
	}, nil
}