/*********
  Rui Santos & Sara Santos - Random Nerd Tutorials
  Complete instructions at https://RandomNerdTutorials.com/esp32-cam-projects-ebook/
  Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files.
  The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
*********/

#include "esp_camera.h"
#include "SPI.h"
#include "driver/rtc_io.h"
#include "soc/rtc_cntl_reg.h"  // Disable brownout problems
#include <ESP_Mail_Client.h>
#include <FS.h>
#include <WiFi.h>

// REPLACE WITH YOUR NETWORK CREDENTIALS
const char* ssid = "REPLACE_WITH_YOUR_SSID";
const char* password = "REPLACE_WITH_YOUR_PASSWORD";

// To send Email using Gmail use port 465 (SSL) and SMTP Server smtp.gmail.com
// You need to create an email app password
#define emailSenderAccount    "SENDER_EMAIL@gmail.com"
#define emailSenderPassword   "YOUR_EMAIL_APP_PASSWORD"
#define smtpServer            "smtp.gmail.com"
#define smtpServerPort        465
#define emailSubject          "ESP32-CAM Photo Captured"
#define emailRecipient        "YOUR_EMAIL_RECIPIENT@example.com"

#define CAMERA_MODEL_AI_THINKER

#if defined(CAMERA_MODEL_AI_THINKER)
  #define PWDN_GPIO_NUM     32
  #define RESET_GPIO_NUM    -1
  #define XCLK_GPIO_NUM      0
  #define SIOD_GPIO_NUM     26
  #define SIOC_GPIO_NUM     27
  #define Y9_GPIO_NUM       35
  #define Y8_GPIO_NUM       34
  #define Y7_GPIO_NUM       39
  #define Y6_GPIO_NUM       36
  #define Y5_GPIO_NUM       21
  #define Y4_GPIO_NUM       19
  #define Y3_GPIO_NUM       18
  #define Y2_GPIO_NUM        5
  #define VSYNC_GPIO_NUM    25
  #define HREF_GPIO_NUM     23
  #define PCLK_GPIO_NUM     22
#else
  #error "Camera model not selected"
#endif

/* The SMTP Session object used for Email sending */
SMTPSession smtp;

/* Callback function to get the Email sending status */
void smtpCallback(SMTP_Status status);

// Photo File Name to save in LittleFS
#define FILE_PHOTO "photo.jpg"
#define FILE_PHOTO_PATH "/photo.jpg"

void setup() {
  WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0); //disable brownout detector
  
  Serial.begin(115200);
  Serial.println();

  // Connect to Wi-Fi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi...");
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println();
  
  // Print ESP32 Local IP Address
  Serial.print("IP Address: http://");
  Serial.println(WiFi.localIP());

  // Init filesystem
  ESP_MAIL_DEFAULT_FLASH_FS.begin();
   
  camera_config_t config;
  config.ledc_channel = LEDC_CHANNEL_0;
  config.ledc_timer = LEDC_TIMER_0;
  config.pin_d0 = Y2_GPIO_NUM;
  config.pin_d1 = Y3_GPIO_NUM;
  config.pin_d2 = Y4_GPIO_NUM;
  config.pin_d3 = Y5_GPIO_NUM;
  config.pin_d4 = Y6_GPIO_NUM;
  config.pin_d5 = Y7_GPIO_NUM;
  config.pin_d6 = Y8_GPIO_NUM;
  config.pin_d7 = Y9_GPIO_NUM;
  config.pin_xclk = XCLK_GPIO_NUM;
  config.pin_pclk = PCLK_GPIO_NUM;
  config.pin_vsync = VSYNC_GPIO_NUM;
  config.pin_href = HREF_GPIO_NUM;
  config.pin_sccb_sda = SIOD_GPIO_NUM;
  config.pin_sccb_scl = SIOC_GPIO_NUM;
  config.pin_pwdn = PWDN_GPIO_NUM;
  config.pin_reset = RESET_GPIO_NUM;
  config.xclk_freq_hz = 20000000;
  config.pixel_format = PIXFORMAT_JPEG;
  config.grab_mode = CAMERA_GRAB_LATEST;
  
  if(psramFound()){
    config.frame_size = FRAMESIZE_UXGA;
    config.jpeg_quality = 10;
    config.fb_count = 1;
  } else {
    config.frame_size = FRAMESIZE_SVGA;
    config.jpeg_quality = 12;
    config.fb_count = 1;
  }

  // Initialize camera
  esp_err_t err = esp_camera_init(&config);
  if (err != ESP_OK) {
    Serial.printf("Camera init failed with error 0x%x", err);
    return;
  }
  
  capturePhotoSaveLittleFS();
  sendPhoto();
}

void loop() {

}

// Capture Photo and Save it to LittleFS
void capturePhotoSaveLittleFS( void ) {
  // Dispose first pictures because of bad quality
  camera_fb_t* fb = NULL;
  // Skip first 3 frames (increase/decrease number as needed).
  for (int i = 0; i < 3; i++) {
    fb = esp_camera_fb_get();
    esp_camera_fb_return(fb);
    fb = NULL;
  }
    
  // Take a new photo
  fb = NULL;  
  fb = esp_camera_fb_get();  
  if(!fb) {
    Serial.println("Camera capture failed");
    delay(1000);
    ESP.restart();
  }  

  // Photo file name
  Serial.printf("Picture file name: %s\n", FILE_PHOTO_PATH);
  File file = LittleFS.open(FILE_PHOTO_PATH, FILE_WRITE);

  // Insert the data in the photo file
  if (!file) {
    Serial.println("Failed to open file in writing mode");
  }
  else {
    file.write(fb->buf, fb->len); // payload (image), payload length
    Serial.print("The picture has been saved in ");
    Serial.print(FILE_PHOTO_PATH);
    Serial.print(" - Size: ");
    Serial.print(fb->len);
    Serial.println(" bytes");
  }
  // Close the file
  file.close();
  esp_camera_fb_return(fb);
}

void sendPhoto( void ) {
  
  /** Enable the debug via Serial port
   * none debug or 0
   * basic debug or 1
  */
  smtp.debug(1);

  /* Set the callback function to get the sending results */
  smtp.callback(smtpCallback);

  /* Declare the session config data */
  Session_Config config;
  
  /*Set the NTP config time
  For times east of the Prime Meridian use 0-12
  For times west of the Prime Meridian add 12 to the offset.
  Ex. American/Denver GMT would be -6. 6 + 12 = 18
  See https://en.wikipedia.org/wiki/Time_zone for a list of the GMT/UTC timezone offsets
  */
  config.time.ntp_server = F("pool.ntp.org,time.nist.gov");
  config.time.gmt_offset = 0;
  config.time.day_light_offset = 1;

  /* Set the session config */
  config.server.host_name = smtpServer;
  config.server.port = smtpServerPort;
  config.login.email = emailSenderAccount;
  config.login.password = emailSenderPassword;
  config.login.user_domain = "";

  /* Declare the message class */
  SMTP_Message message;

  /* Enable the chunked data transfer with pipelining for large message if server supported */
  message.enable.chunking = true;

  /* Set the message headers */
  message.sender.name = "ESP32-CAM";
  message.sender.email = emailSenderAccount;

  message.subject = emailSubject;
  message.addRecipient("Sara", emailRecipient);

  String htmlMsg = "<h2>Photo captured with ESP32-CAM and attached in this email.</h2>";
  message.html.content = htmlMsg.c_str();
  message.html.charSet = "utf-8";
  message.html.transfer_encoding = Content_Transfer_Encoding::enc_qp;

  message.priority = esp_mail_smtp_priority::esp_mail_smtp_priority_normal;
  message.response.notify = esp_mail_smtp_notify_success | esp_mail_smtp_notify_failure | esp_mail_smtp_notify_delay;

  /* The attachment data item */
  SMTP_Attachment att;

  /** Set the attachment info e.g. 
   * file name, MIME type, file path, file storage type,
   * transfer encoding and content encoding
  */
  att.descr.filename = FILE_PHOTO;
  att.descr.mime = "image/png"; 
  att.file.path = FILE_PHOTO_PATH;
  att.file.storage_type = esp_mail_file_storage_type_flash;
  att.descr.transfer_encoding = Content_Transfer_Encoding::enc_base64;

  /* Add attachment to the message */
  message.addAttachment(att);

  /* Connect to server with the session config */
  if (!smtp.connect(&config))
    return;

  /* Start sending the Email and close the session */
  if (!MailClient.sendMail(&smtp, &message, true))
    Serial.println("Error sending Email, " + smtp.errorReason());
}

// Callback function to get the Email sending status
void smtpCallback(SMTP_Status status){
  /* Print the current status */
  Serial.println(status.info());

  /* Print the sending result */
  if (status.success())
  {
    Serial.println("----------------");
    Serial.printf("Message sent success: %d\n", status.completedCount());
    Serial.printf("Message sent failled: %d\n", status.failedCount());
    Serial.println("----------------\n");
    struct tm dt;

    for (size_t i = 0; i < smtp.sendingResult.size(); i++){
      /* Get the result item */
      SMTP_Result result = smtp.sendingResult.getItem(i);
      time_t ts = (time_t)result.timestamp;
      localtime_r(&ts, &dt);

      ESP_MAIL_PRINTF("Message No: %d\n", i + 1);
      ESP_MAIL_PRINTF("Status: %s\n", result.completed ? "success" : "failed");
      ESP_MAIL_PRINTF("Date/Time: %d/%d/%d %d:%d:%d\n", dt.tm_year + 1900, dt.tm_mon + 1, dt.tm_mday, dt.tm_hour, dt.tm_min, dt.tm_sec);
      ESP_MAIL_PRINTF("Recipient: %s\n", result.recipients.c_str());
      ESP_MAIL_PRINTF("Subject: %s\n", result.subject.c_str());
    }
    Serial.println("----------------\n");

   // You need to clear sending result as the memory usage will grow up.
   smtp.sendingResult.clear();
  }
}