/*
 * Copyright (C) 2024  Tristan Riehs
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
#include "config.h"

#include <raylib.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "disp.h"

#define DEFAULT_HEIGHT 200
#define DEFAULT_WIDTH 16*DEFAULT_HEIGHT/9

void
init(void)
{
#ifndef NDEBUG
	SetTraceLogLevel(LOG_DEBUG);
#else
	SetTraceLogLevel(LOG_ERROR);
#endif

	InitWindow(DEFAULT_WIDTH, DEFAULT_HEIGHT, "calculer");

	if (!IsWindowReady())
	{
		fprintf(stderr, "calculer: error initialiazing Raylib \
window\n");
		exit(1);
	}

	SetTargetFPS(60);
	SetWindowState(FLAG_WINDOW_RESIZABLE);

	BeginDrawing();
	ClearBackground(RAYWHITE);
	EndDrawing();

	TraceLog(LOG_INFO, "window successfully initialized");
}

static int
min(int x, int y)
{
	if (x < y)
		return x;
	else
		return y;
}

void
display_calc(int x, int y)
{
	char txt[32] = {0};
	int win_width, win_height;
	int txt_width;
	int font_size;

	sprintf(txt, "%d + %d", x, y);

	win_width = GetScreenWidth();
	win_height = GetScreenHeight();

	font_size = min(win_height/3, 40);
	txt_width = MeasureText(txt, font_size);

	if (txt_width > win_width)
	{
		float scale = txt_width/win_width;
		font_size = font_size/scale;
		txt_width = MeasureText(txt, font_size);
	}

	BeginDrawing();
	ClearBackground(RAYWHITE);
	DrawText(txt, (win_width-txt_width)/2, win_height/6, font_size, GRAY);
	EndDrawing();

	TraceLog(LOG_INFO, "calulation %d + %d successfully drawn", x, y);
}

int
read_input(void)
{
	TraceLog(LOG_INFO, "waiting for user input");
	while (!WindowShouldClose())
	{
		/* BeginDrawing(); */
		PollInputEvents();
		if (IsKeyPressed(KEY_ENTER))
		{
			TraceLog(LOG_INFO, "enter key pressed");
			return DISP_QUIT;
		}
		if (IsKeyPressed(KEY_Q))
		{
			return DISP_QUIT;
		}
		if (IsKeyPressed(KEY_R) || IsKeyPressed(KEY_G))
		{
			return DISP_RELOAD;
		}
		/* EndDrawing(); */
	}
	return INT_MAX;
}

void
display_res(bool, int)
{

}

void
destroy(void)
{
	CloseWindow();
}

#ifndef NDEBUG
void *
pre_reload(void)
{
	TraceLog(LOG_INFO, "pre-reload actions done");
	return NULL;
}

void
post_reload(void *state)
{
	(void) state;
	TraceLog(LOG_INFO, "post-reload actions done");
}
#endif