#include "base.h"
no_warn_start
#include <SDL2/SDL.h>
no_warn_end
#include <GL/gl.h>
#include <locale.h>
#include "text.h"

static void die(char const *fmt, ...) {
	char buf[256] = {0};
	
	va_list args;
	va_start(args, fmt);
	vsnprintf(buf, sizeof buf - 1, fmt, args);
	va_end(args);

	// show a message box, and if that fails, print to stderr
	if (SDL_ShowSimpleMessageBox(SDL_MESSAGEBOX_ERROR, "Error", buf, NULL) < 0) {
		fprintf(stderr, "%s\n", buf);
	}

	exit(EXIT_FAILURE);
}


int main(void) {
	setlocale(LC_ALL, ""); // allow unicode
	if (SDL_Init(SDL_INIT_VIDEO|SDL_INIT_TIMER) < 0)
		die("%s", SDL_GetError());

	SDL_Window *window = SDL_CreateWindow("ted", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, 1280, 720, SDL_WINDOW_SHOWN|SDL_WINDOW_OPENGL);
	if (!window)
		die("%s", SDL_GetError());

	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, 2);
	SDL_GL_SetAttribute(SDL_GL_CONTEXT_MINOR_VERSION, 0);
	SDL_GLContext *glctx = SDL_GL_CreateContext(window);
	if (!glctx) {
		die("%s", SDL_GetError());
	}

	SDL_GL_SetSwapInterval(1); // vsync

	Font *font = text_font_load("assets/font.ttf", 24);
	if (!font) {
		die("Couldn't load font: %s", text_get_err());
	}
	
	bool quit = false;
	while (!quit) {
		SDL_Event event;
		while (SDL_PollEvent(&event)) {
			switch (event.type) {
			case SDL_QUIT:
				quit = true;
				break;
			}
		}

		int window_width = 0, window_height = 0;
		SDL_GetWindowSize(window, &window_width, &window_height);

		// set up GL
		glEnable(GL_BLEND);
		glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
		glViewport(0, 0, window_width, window_height);
		glMatrixMode(GL_MODELVIEW);
		glLoadIdentity();
		glOrtho(0, window_width, 0, window_height, -1, +1);
		glClearColor(0, 0, 0, 1);
		glClear(GL_COLOR_BUFFER_BIT);

		glColor3f(1,1,1);
		text_render(font, u8"hőello☐øλㄔ☺☹", 50, 50);
		if (text_has_err()) {
			printf("Text error: %s\n", text_get_err());
			break;
		}

		SDL_GL_SwapWindow(window);
	}

	SDL_GL_DeleteContext(glctx);
	SDL_DestroyWindow(window);
	SDL_Quit();
	text_font_free(font);

	return 0;
}