#include <stdio.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/i2c.h"
#include "driver/uart.h"
#include "rom/ets_sys.h"


#define LCD_20X04   1

#define I2C_ACK_CHECK_EN  1      
#define I2C_ADDRESS_LCD   0x27       
#define I2C_SCL_LCD       21    
#define I2C_SDA_LCD       22    

/* Comandos de la LCD */
#define CLEAR_DISPLAY               0x01
#define RETURN_HOME_UNSHIFT         0x02
#define CURSOR_RIGHT_NO_SHIFT       0x04
#define CURSOR_RIGHT_SHIFT          0x05
#define CURSOR_RIGHT_NO_SHIFT_LEFT  0x06
#define CURSOR_RIGHT_SHIFT_LEFT     0x07
#define DISPLAY_OFF                 0x08
#define DISPLAY_ON_CURSOR_OFF       0x0C
#define DISPLAY_ON_CURSOR_ON_STEADY 0x0E
#define DISPLAY_ON_CURSOR_ON_BLINK  0x0F
#define SHIFT_CURSOR_LEFT           0x10
#define SHIFT_CURSOR_RIGHT          0x14
#define SHIFT_DISPLAY_LEFT          0x18
#define SHIFT_DISPLAY_RIGHT         0x1C
#define SET_4BIT_MODE               0x28
#define RETURN_HOME                 0x80

/* PCF8574 */
#define PCF8574_RS    0
#define PCF8574_RW    1
#define PCF8574_EN    2
#define PCF8574_BL    3

#define LCD_RS_CMD    0
#define LCD_RS_DATA   1

/* UART */
const uart_port_t uart_num = UART_NUM_0;
const int uart_buffer_size = (1024 * 2);
QueueHandle_t uart_queue;

/* TASK */
static uint8_t ucParameterToPass;
TaskHandle_t xHandle = NULL;

/* Variables */
char C[5];
char R[5];
char Pal[50];


typedef struct {
  uint8_t i2c_address;
  uint8_t i2c_port;
  uint8_t screen_size;
  uint8_t screen_backlight;
} lcd_i2c_device_t;

void i2c_init(void);
void lcd_init(lcd_i2c_device_t * lcd);
void lcd_i2c_write_byte(lcd_i2c_device_t * lcd, uint8_t data);
void lcd_i2c_write_command(lcd_i2c_device_t * lcd, uint8_t register_select, uint8_t cmd);
void lcd_set_cursor(lcd_i2c_device_t * lcd, uint8_t column, uint8_t row);
void lcd_i2c_write_custom_char(lcd_i2c_device_t * lcd, uint8_t char_address, const uint8_t * pixels);

void i2c_init(void) 
{
    /* Configure la conexión aquí */
  i2c_config_t i2c_config = {
      .mode = I2C_MODE_MASTER,
      .sda_io_num = I2C_SDA_LCD,
      .sda_pullup_en = GPIO_PULLUP_ENABLE,
      .scl_io_num = I2C_SCL_LCD,
      .scl_pullup_en = GPIO_PULLUP_ENABLE,
      .master.clk_speed = 400000,
  };

  esp_err_t error = i2c_param_config(I2C_NUM_1, &i2c_config);
  if (error != ESP_OK) {
        while(1);
    }
  i2c_driver_install(I2C_NUM_1, I2C_MODE_MASTER, 0, 0, 0);
}

void lcd_init(lcd_i2c_device_t * lcd)
{
  lcd_i2c_write_command(lcd, LCD_RS_CMD, RETURN_HOME_UNSHIFT);
  lcd_i2c_write_command(lcd, LCD_RS_CMD, SET_4BIT_MODE);
  lcd_i2c_write_command(lcd, LCD_RS_CMD, CLEAR_DISPLAY);
  lcd_i2c_write_command(lcd, LCD_RS_CMD, DISPLAY_ON_CURSOR_OFF);
  lcd_i2c_write_command(lcd, LCD_RS_CMD, CURSOR_RIGHT_NO_SHIFT_LEFT);
  vTaskDelay(20 / portTICK_PERIOD_MS);
}

void lcd_i2c_write_byte(lcd_i2c_device_t * lcd, uint8_t data)
{
  i2c_cmd_handle_t cmd_handle = i2c_cmd_link_create();
  i2c_master_start(cmd_handle);
  i2c_master_write_byte(cmd_handle, (lcd->i2c_address << 1) | I2C_MASTER_WRITE, I2C_ACK_CHECK_EN);
  i2c_master_write_byte(cmd_handle, data, 1);
  i2c_master_stop(cmd_handle);
  i2c_master_cmd_begin(lcd->i2c_port, cmd_handle, 100 / portTICK_PERIOD_MS);
  i2c_cmd_link_delete(cmd_handle);
}

void lcd_i2c_write_command(lcd_i2c_device_t * lcd, uint8_t register_select, uint8_t cmd)
{
  uint8_t config = (register_select)? (1 << PCF8574_RS) : 0;
  config |= (lcd->screen_backlight)? (1 << PCF8574_BL) : 0;

  config |= (config & 0x0F) | (0xF0 & cmd);
  config |= (1 << PCF8574_EN);
  lcd_i2c_write_byte(lcd, config);
  ets_delay_us(10);
  config &= ~(1 << PCF8574_EN);
  lcd_i2c_write_byte(lcd, config);
  ets_delay_us(50);

  config = (config & 0x0F) | (cmd << 4);
  config |= (1 << PCF8574_EN);
  lcd_i2c_write_byte(lcd, config);
  ets_delay_us(10);
  config &= ~(1 << PCF8574_EN);
  lcd_i2c_write_byte(lcd, config);
  ets_delay_us(50);

  if (cmd == CLEAR_DISPLAY)
  {
    vTaskDelay(20 / portTICK_PERIOD_MS);
  }
}

void lcd_set_cursor(lcd_i2c_device_t * lcd, uint8_t column, uint8_t row)
{
  switch (row) {
    case 0:
      lcd_i2c_write_command(lcd, LCD_RS_CMD, 0x80 + column);
      break;
    case 1:
      lcd_i2c_write_command(lcd, LCD_RS_CMD, 0xC0 + column);
      break;
    case 2:
      lcd_i2c_write_command(lcd, LCD_RS_CMD, 0x94 + column);
      break;
    case 3:
      lcd_i2c_write_command(lcd, LCD_RS_CMD, 0xD4 + column);
      break;
    default:
      break;
  }
}

void lcd_i2c_write_custom_char(lcd_i2c_device_t * lcd, uint8_t address, const uint8_t * pixels)
{
  lcd_i2c_write_command(lcd, LCD_RS_CMD, 0x40 | (address << 3));

  for (uint8_t i = 0; i < 8; i++)
  {
    lcd_i2c_write_command(lcd, LCD_RS_DATA, pixels[i]);
  }

  lcd_i2c_write_command(lcd, LCD_RS_CMD, RETURN_HOME);
}

void lcd_i2c_print_msg(lcd_i2c_device_t * lcd, char * msg)
{
  uint8_t i = 0;

  while (msg[i] != '\0')
  {
    lcd_i2c_write_command(lcd, LCD_RS_DATA, msg[i++]);
  }
}

void uartInit(){
uart_config_t uart_config = {
    .baud_rate = 115200,
    .data_bits = UART_DATA_8_BITS,
    .parity = UART_PARITY_DISABLE,
    .stop_bits = UART_STOP_BITS_1,
    .flow_ctrl = UART_HW_FLOWCTRL_CTS_RTS,
    .rx_flow_ctrl_thresh = 122,
};
// Configure UART parameters
ESP_ERROR_CHECK(uart_param_config(uart_num, &uart_config));

// Install UART driver using an event queue here
ESP_ERROR_CHECK(uart_driver_install(UART_NUM_0, uart_buffer_size, uart_buffer_size, 10, &uart_queue, 0));
}

void uartPuts(char data[]){
  uart_write_bytes(uart_num, (const char*)data, strlen(data));
}

void uartGets(uint8_t* data){
  int length = 0;
  while(!length){
    ESP_ERROR_CHECK(uart_get_buffered_data_len(uart_num, (size_t*)&length));
  }
  length = uart_read_bytes(uart_num, data, length, 100 / portTICK_PERIOD_MS);
  for (int i = 0;i < length;i++){
    if(data[i] == '\n' || data[i] == '\r'){
      data[i] = '\0';
      break;
    }
  }
}

void vTaskCode( void * pvParameters )
{

  lcd_i2c_device_t my_lcd = {
    .i2c_port = I2C_NUM_1,
    .i2c_address = I2C_ADDRESS_LCD,
    .screen_size = LCD_20X04,
    .screen_backlight = 1,
  };

  vTaskDelay(20 / portTICK_PERIOD_MS);
  lcd_init(&my_lcd);

  uartPuts("Renglon: \n");
  uartGets((uint8_t*)R);
  int Ren = atoi(R);

  uartPuts("Columna: \n");
  uartGets((uint8_t*)C);
  int Col = atoi(C);

  //Inicializar campo
  int campo[Ren][Col];
  memset(campo, 0, sizeof(campo));

  char carac[50];
  char cara[50];

  //Los puntos van se ponen similando los caracteres a usar
  for(int i = 0;i < Col;i++){
    for(int j = 0;j < Ren;j++){
      sscanf("%c",carac);
      uartGets((uint8_t*)cara);
      uartPuts(cara);
      uartPuts(" ");
    }
    uartPuts("\n");
  }

  uartPuts("Palabras a buscar: \n");
  uartGets((uint64_t*)Pal);
  


  //poder imprimir en la lcd
  char Resul[50];
  snprintf(Resul,sizeof(Resul),Pal);

  lcd_i2c_print_msg(&my_lcd, Resul);


  vTaskSuspend( xHandle );

}

/* 
Matriz de caracteres:

'P' 'S' 'U' 'W' 'D' 'A' 'T' 'S'     
'S' 'A'	'I'	'X'	'A'	'L'	'A'	'G'
'N'	'Y'	'O'	'L'	'D'	'D'	'Z'	'L'
'F'	'I'	'N'	'G'	'I'	'Z'	'U'	'M'
'L'	'L'	'A'	'V'	'N'	'S'	'L'	'A'
'A'	'T'	'B'	'V'	'U'	'Y'	'E'	'S'
'B'	'A'	'R'	'C'	'O'	'O'	'C'	'E'
'E'	'V'	'A'	'L'	'L'	'K'	'E'	'M'

Entradas (palabras):

AZUL, ECO, LLAVE, BARCO, MESA, UNIDAD, GALAXIAS
 */


#define SMILE        5
#define DROP         2


void app_main()
{
  i2c_init();
  uartInit();

  uartPuts("Hola Alain\n");

  //lcd_i2c_print_msg(&my_lcd, message);

  xTaskCreate( vTaskCode, "vTaskCode", 2*(2*1024), NULL, 1, NULL );

  }