#include "SDL2/SDL.h"
#include <SDL2/SDL_events.h>
#include <SDL2/SDL_hints.h>
#include <SDL2/SDL_keycode.h>
#include <SDL2/SDL_mouse.h>
#include <SDL2/SDL_rect.h>
#include <SDL2/SDL_render.h>
#include <SDL2/SDL_thread.h>
#include <SDL2/SDL_timer.h>
#include <SDL2/SDL_video.h>
#include <SDL2/SDL_image.h>
#include <SDL2/SDL_ttf.h>
#include <stdlib.h>
#include "cell.h"

const int SCREEN_WIDTH = 1280;
const int SCREEN_HEIGHT = 720;
const int CELL_SIZE = 15;
const int MAX_X = SCREEN_WIDTH / CELL_SIZE - 1;
const int MAX_Y = SCREEN_HEIGHT / CELL_SIZE - 1;

typedef struct {
    SDL_Window *window;
    SDL_Renderer *renderer;
    TTF_Font* font;
}   App;

typedef struct {
  Cell** cells;
  int size;
  unsigned int capcity;
} CellList;

CellList* GlobalList;

App app;

void Cleanup(void);
void HandleInput(void);
int GetIndex(int x, int y, int columns);
int GetNotSoRandomNumber(int);

int main(int argc, char** argv) {
    memset(&app, 0, sizeof(app));

    atexit(Cleanup);

    if (SDL_Init(SDL_INIT_VIDEO) < 0){
        printf("SDL failed: %s\n", SDL_GetError());
        return -1;
    }

     if (TTF_Init() < 0) {
        printf("Failed to init TTF: %s\n", TTF_GetError());
        return -1;
    }

    app.font = TTF_OpenFont("/usr/share/fonts/TTF/Hack-Regular.ttf", 14);

    if (app.font == NULL) {
        printf("Failed to load font\n");
        return -1;
    }

    app.window = SDL_CreateWindow("SDL Tutorial", SDL_WINDOWPOS_UNDEFINED, SDL_WINDOWPOS_UNDEFINED, SCREEN_WIDTH, SCREEN_HEIGHT, SDL_WINDOW_SHOWN);

    if (app.window == NULL){
        printf("Window creation failed: %s\n", SDL_GetError());
        return -1;
    }

    SDL_SetHint(SDL_HINT_RENDER_SCALE_QUALITY, "linear");

    app.renderer = SDL_CreateRenderer(app.window, -1, SDL_RENDERER_ACCELERATED);

    if (app.renderer == NULL) {
        printf("Renderer failed: %s\n", SDL_GetError());
        return -1;
    }

    GlobalList = calloc(1, sizeof(CellList));
    GlobalList->cells = calloc(GetIndex(MAX_X, MAX_Y, MAX_X), sizeof(Cell*));
    GlobalList->capcity = GetIndex(MAX_X, MAX_Y, MAX_X);
    GlobalList->size = 0;

    SDL_Rect* rect = malloc(sizeof(SDL_Rect));
    rect->h = CELL_SIZE;
    rect->w = CELL_SIZE;
    // rect->x = 0;//MAX_X * CELL_SIZE;
    // rect->y = 0;//MAX_Y * CELL_SIZE;
    // Cell* cell = CreateCell(*rect);

    while(1){

        HandleInput();

        SDL_Delay(128);

        SDL_SetRenderDrawColor(app.renderer, 0, 0, 0, 255);

        SDL_RenderClear(app.renderer);

        SDL_SetRenderDrawColor(app.renderer, 255, 255, 255, 255);

        for(int i = 0; i < GlobalList->capcity; i++) {
          if (GlobalList->cells[i] == NULL) continue;

          Cell* cell = GlobalList->cells[i];

          rect->x = cell->x * CELL_SIZE;
          rect->y = cell->y * CELL_SIZE;

          SDL_RenderFillRect(app.renderer, rect);
        }

        // rect->x += CELL_SIZE;
        // rect->y += CELL_SIZE;

        // if (rect->x / CELL_SIZE > MAX_X) rect->x = 0;
        // if (rect->y / CELL_SIZE > MAX_Y) rect->y = 0;

        // SDL_RenderFillRect(app.renderer, rect);

        SDL_RenderPresent(app.renderer);
    }

    //free(cell);
}

void Cleanup(void) {
    SDL_DestroyWindow(app.window);
    SDL_DestroyRenderer(app.renderer);
    TTF_CloseFont(app.font);
    TTF_Quit();
    SDL_Quit();
}

void Thing(int x, int y) {
  x = x / CELL_SIZE;
  y = y /CELL_SIZE;

  if (GlobalList->cells[GetIndex(x, y, MAX_X)] == NULL) {
    GlobalList->cells[GetIndex(x, y, MAX_X)] = CreateCell(x, y);
    GlobalList->size++;
  }
  else {
    printf("Cell already at [%d, %d]\n", x, y);
  }
}

void HandleInput(void) {
  SDL_Event event;
  while(SDL_PollEvent(&event)) {
    switch (event.type) {
      case SDL_QUIT:
        exit(0);
        break;
      case SDL_MOUSEBUTTONDOWN:
        if (event.button.button == SDL_BUTTON_RIGHT) exit(0);
        else Thing(event.button.x, event.button.y);
      case SDL_KEYDOWN:
      default:
        break;
    }
  }
}

int GetIndex(int x, int y, int columns) {
  return x + y * columns;
}

int GetNotSoRandomNumber(int max) {
  return rand() % (max + 1);
}