use sdl2::gfx::primitives::DrawRenderer;
use sdl2::pixels::Color;
use sdl2::rect::{Point, Rect};
use sdl2::render::{BlendMode, Canvas, Texture};
use sdl2::video::{FullscreenType, Window};

pub struct Renderer {
    canvas: Canvas<Window>,
}

impl Renderer {
    pub fn new(mut canvas: Canvas<Window>) -> Self {
        canvas.set_blend_mode(BlendMode::Add);
        canvas.set_draw_color((0, 0, 0));
        canvas.clear();
        canvas.present();
	Renderer { canvas }
    }

    pub fn canvas(&mut self) -> &mut Canvas<Window> {
	&mut self.canvas
    }

    #[allow(dead_code)]
    pub fn viewport(&self) -> (u16, u16) {
	let vp = self.canvas.viewport();
	(vp.width() as u16, vp.height() as u16)
    }

    pub fn toggle_fullscreen(&mut self) {
        match self.canvas.window().fullscreen_state() {
            FullscreenType::Off => self
                .canvas
                .window_mut()
                .set_fullscreen(FullscreenType::Desktop),
            _ => self.canvas.window_mut().set_fullscreen(FullscreenType::Off),
        }
        .unwrap();
    }

    pub fn clear(&mut self) {
        self.canvas.set_draw_color((0, 0, 0));
        self.canvas.clear();
    }

    pub fn present(&mut self) {
        self.canvas.present();
    }

    pub fn blit<R1, R2>(&mut self, texture: &Texture, src: R1, dst: R2)
    where R1: Into<Option<Rect>>,
          R2: Into<Option<Rect>>
    {
	self.canvas.copy(texture, src, dst).unwrap();
    }

    pub fn blit_ex<R1, R2, P>(&mut self,
                              texture: &Texture,
                              src: R1,
                              dst: R2,
                              angle: f64,
                              center: P,
                              flip_horizontal: bool,
                              flip_vertical: bool)
    where R1: Into<Option<Rect>>,
          R2: Into<Option<Rect>>,
          P: Into<Option<Point>>
    {
	self.canvas.copy_ex(texture, src, dst, angle, center, flip_horizontal, flip_vertical).unwrap();
    }

    pub fn circle<P, C>(&self, pos: P, rad: i16, col: C)
    where P: Into<(i16, i16)>,
	  C: Into<Color>,
    {
	let pos = pos.into();
	self.canvas.aa_circle(pos.0, pos.1, rad, col.into()).unwrap();
    }

    pub fn ellipse<P, R, C>(&self, pos: P, rad: R, col: C)
    where P: Into<(i16, i16)>,
	  R: Into<(i16, i16)>,
	  C: Into<Color>,
    {
	let pos = pos.into();
	let rad = rad.into();
	self.canvas.aa_ellipse(pos.0, pos.1, rad.0, rad.1, col.into()).unwrap();
    }

    pub fn draw_line<P1, P2, C>(&mut self, start: P1, end: P2, col: C)
    where P1: Into<Point>,
	  P2: Into<Point>,
	  C: Into<Color>,
    {
	self.canvas.set_draw_color(col);
	self.canvas.draw_line(start, end).unwrap();
    }
}