#include <SDL2/SDL.h>
#include <SDL2/SDL_image.h>
#include <stdio.h>
#include <stdbool.h>

#define _DEBUG

#include "texture.h"
#include "fs.h"
#include "grid.h"

#define SCREEN_WIDTH 640
#define SCREEN_HEIGHT 480

int main(int argc, char* args[]) {
	SDL_Window* window = NULL;
	SDL_Renderer* renderer = NULL;

		/* SDL Initialization */

	if (SDL_Init(SDL_INIT_VIDEO) < 0) {
		fprintf(stderr, "Could not initialize SDL2: %s\n", SDL_GetError());
		return 1;
	}
	if (IMG_Init(IMG_INIT_JPG || IMG_INIT_PNG) < 0) {
		fprintf(stderr, "Could not initialize SDL2_image: %s\n", IMG_GetError());
	}

	SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "1");
	
	window = SDL_CreateWindow("pscsp",
			SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED,
			SCREEN_WIDTH, SCREEN_HEIGHT,
			SDL_WINDOW_SHOWN
		);
	if (window == NULL) {
		fprintf(stderr, "Could not create window: %s\n", SDL_GetError());
		return 1;
	}

	renderer = SDL_CreateRenderer(
			window,
			-1,
			SDL_RENDERER_ACCELERATED | SDL_RENDERER_PRESENTVSYNC
			);
	if (renderer == NULL) {
		fprintf(stderr, "Could not create renderer: %s\n", SDL_GetError());
		return 1;
	}

	const Uint8* currentKeyStates = SDL_GetKeyboardState(NULL);

		/* Init of the game */

	// Get image file names and their count
	char ** imageNames = listFiles("assets/");
	int nfiles = countFiles("assets/");

	// Allocate space for the images
	SDL_Texture **thumbs = (SDL_Texture **) malloc(sizeof(SDL_Texture *) * nfiles);

	// Load the images (and free the strings allocated before)
	for(int i = 0; i < nfiles; i++){
		thumbs[i] = NULL;
		thumbs[i] = IMG_LoadTexture(renderer, imageNames[i]);

		if(thumbs[i] == NULL){
			fprintf(stderr, "Error on loading image at path \"%s\".\n", imageNames[i]);
		}
		else{
			//fprintf(stderr, "Loaded image on at path \"%s\".\n", imageNames[i]);
		}

		free(imageNames[i]);
		imageNames[i] = NULL;
	}

	SDL_Rect thumbs_container = {0, 0, SCREEN_WIDTH/3*2, SCREEN_HEIGHT};
	SDL_Rect thumbs_rect = {40, 40, 40, 40};
	int min_zoom = 1, max_zoom = 100;
	int zoom = 25;


	for(int i = 0; i < nfiles; i++){
		gridHelper(&thumbs_rect, i, thumbs_container, 1, 0);
		//printf("index %3i -- x = %5i | y = %4i | w = %3i | h = %3i\n",i, thumbs_rect.x, thumbs_rect.y, thumbs_rect.w, thumbs_rect.h);
	}

	bool quit = false;
	SDL_Event e;
	while(!quit){
		while(SDL_PollEvent(&e)!=0){
			if(e.type == SDL_QUIT){
				quit = true;
			}
			if(e.type == SDL_MOUSEWHEEL && currentKeyStates[SDL_SCANCODE_LCTRL]){
				printf("%d\n", e.wheel.y);
				zoom += e.wheel.y * 4;
				if(     zoom > max_zoom) zoom = max_zoom;
				else if(zoom < min_zoom) zoom = min_zoom;
			}
		}
		if(currentKeyStates[SDL_SCANCODE_ESCAPE]){
			return 0;
		}

		SDL_SetRenderDrawColor(renderer, 0, 0, 0, 0xFF);
		SDL_RenderClear(renderer);

		// Thumbnail grid rendering
		//thumbs_rect.x = 0;
		//thumbs_rect.y = 0;
		for(int i = 0; i < nfiles; i++){
			gridHelper(&thumbs_rect, i, thumbs_container, zoom, 0);
			SDL_RenderCopy(renderer, thumbs[i], NULL, &thumbs_rect);
		}

		SDL_RenderPresent(renderer);
	}

	// Deallocations
	printf("\nDeallocating assets...\n");
	for(int i = 0; i < nfiles; i++){
		SDL_DestroyTexture(thumbs[i]);
		thumbs[i] = NULL;
	}

	SDL_DestroyWindow(window);
	window = NULL;
	SDL_DestroyRenderer(renderer);
	renderer = NULL;

	SDL_Quit();
	IMG_Quit();
	return 0;
}