use gl::*;
use glm;
use glw;
use math;
use sdl2::*;
use time;
use trace;

type Vertex = struct {
	position: [3]u16,
	normal: [3]i8,
	texcoord: [2]u16,
	flags: u8,
};

type VertexFlags = enum u8 {
	U_EXCL = 1 << 0,
	V_EXCL = 1 << 1,
};

fn render_init(assets: *Pack) void = {
	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	load_textures(assets);
	trace::debug(&trace::root, "texture loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	load_atlases(assets);
	trace::debug(&trace::root, "atlas loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	load_fonts(assets);
	trace::debug(&trace::root, "font loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	load_models(assets);
	trace::debug(&trace::root, "model loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	load_render_bstates(assets);
	trace::debug(&trace::root, "render bstate loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	const t = time::now(time::clock::MONOTONIC);
	const u = time::now(time::clock::PROCESS_CPU);
	shaders_init();
	trace::debug(&trace::root, "shader loading took rt {} ms / cpu {} ms",
		time::diff(t, time::now(time::clock::MONOTONIC)) / 1000000,
		time::diff(u, time::now(time::clock::PROCESS_CPU)) / 1000000);

	hud_load();
};

fn render_destroy() void = {
	// TODO:
	// shaders_finish();
	// render_bstates_finish();
	// models_finish();
	// atlases_finish();
	finish_textures();
};

fn render_wait_screen(text: str) void = {
	let (width, height) = drawable_size();
	glViewport(0, 0, width: i32, height: i32);

	let gui_width = width / gui_scale();
	let gui_height = height / gui_scale();

	glClearColor(0.0, 0.0, 0.0, 1.0);
	glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

	const font = fonts_find("minecraft:default") as *Font;
	const metrics = font_measure(font, text);
	const text_trans = glm::translation_make(&[
		(gui_width: f32 - metrics.width) / 2.0,
		gui_height: f32 / 2.0,
		0.0]);
	const text_trans = glm::m4_mul(gui_proj(), &text_trans);
	render_text_shadow(text, font, &text_trans, [255...]);
};