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/*
	
    Send photo every X minutes, except during dark (analogRead LDR)
	
    Based on https://RandomNerdTutorials.com/telegram-esp32-cam-photo-arduino/
	
*/

#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClientSecure.h>
#include "soc/soc.h"
#include "soc/rtc_cntl_reg.h"
#include "esp_camera.h"
#include <UniversalTelegramBot.h>
#include <ArduinoJson.h>

// Initialize Telegram BOT
String BOTtoken = "BOTtoken";  // your Bot Token (Get from Botfather)

// Use @myidbot to find out the chat ID of an individual or a group
// Also note that you need to click "start" on a bot before it can
// message you
String CHAT_ID = "CHAT_ID";

const char* ssid = "ssid";
const char* password = "password";

WiFiClientSecure clientTCP;
UniversalTelegramBot bot(BOTtoken, clientTCP);

#define FLASH_LED_PIN 4
bool flashState = LOW;

//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

#define ldrPin 33


void configInitCamera() {
	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_sscb_sda = SIOD_GPIO_NUM;
	config.pin_sscb_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;
	
	//init with high specs to pre-allocate larger buffers
	if (psramFound()) {
		config.frame_size = FRAMESIZE_UXGA;
		config.jpeg_quality = 10;  //0-63 lower number means higher quality
		config.fb_count = 2;
		} else {
		config.frame_size = FRAMESIZE_SVGA;
		config.jpeg_quality = 12;  //0-63 lower number means higher quality
		config.fb_count = 1;
	}
	
	// camera init
	esp_err_t err = esp_camera_init(&config);
	if (err != ESP_OK) {
		Serial.printf("Camera init failed with error 0x%x", err);
		delay(1000);
		ESP.restart();
	}
	
	// Drop down frame size for higher initial frame rate
	sensor_t * s = esp_camera_sensor_get();
	s->set_framesize(s, FRAMESIZE_CIF);  // UXGA|SXGA|XGA|SVGA|VGA|CIF|QVGA|HQVGA|QQVGA
}


String sendPhotoTelegram() {
	const char* myDomain = "api.telegram.org";
	String getAll = "";
	String getBody = "";
	
	camera_fb_t * fb = NULL;
	fb = esp_camera_fb_get();
	if (!fb) {
		Serial.println("Camera capture failed");
		delay(1000);
		ESP.restart();
		return "Camera capture failed";
	}
	
	Serial.println("Connect to " + String(myDomain));
	
	
	if (clientTCP.connect(myDomain, 443)) {
		Serial.println("Connection successful");
		
		String head = "--RandomNerdTutorials\r\nContent-Disposition: form-data; name=\"chat_id\"; \r\n\r\n" + CHAT_ID + "\r\n--RandomNerdTutorials\r\nContent-Disposition: form-data; name=\"photo\"; filename=\"esp32-cam.jpg\"\r\nContent-Type: image/jpeg\r\n\r\n";
		String tail = "\r\n--RandomNerdTutorials--\r\n";
		
		uint16_t imageLen = fb->len;
		uint16_t extraLen = head.length() + tail.length();
		uint16_t totalLen = imageLen + extraLen;
		
		clientTCP.println("POST /bot" + BOTtoken + "/sendPhoto HTTP/1.1");
		clientTCP.println("Host: " + String(myDomain));
		clientTCP.println("Content-Length: " + String(totalLen));
		clientTCP.println("Content-Type: multipart/form-data; boundary=RandomNerdTutorials");
		clientTCP.println();
		clientTCP.print(head);
		
		uint8_t *fbBuf = fb->buf;
		size_t fbLen = fb->len;
		for (size_t n = 0; n < fbLen; n = n + 1024) {
			if (n + 1024 < fbLen) {
				clientTCP.write(fbBuf, 1024);
				fbBuf += 1024;
			}
			else if (fbLen % 1024 > 0) {
				size_t remainder = fbLen % 1024;
				clientTCP.write(fbBuf, remainder);
			}
		}
		
		clientTCP.print(tail);
		
		esp_camera_fb_return(fb);
		
		int waitTime = 10000;   // timeout 10 seconds
		long startTimer = millis();
		boolean state = false;
		
		while ((startTimer + waitTime) > millis())
		{
			Serial.print(".");
			delay(100);
			while (clientTCP.available())
			{
				char c = clientTCP.read();
				if (c == '\n')
				{
					if (getAll.length() == 0) state = true;
					getAll = "";
				}
				else if (c != '\r')
				getAll += String(c);
				if (state == true) getBody += String(c);
				startTimer = millis();
			}
			if (getBody.length() > 0) break;
		}
		clientTCP.stop();
		Serial.println(getBody);
	}
	else {
		getBody = "Connected to api.telegram.org failed.";
		Serial.println("Connected to api.telegram.org failed.");
	}
	return getBody;
}

void setup() {
	
	// Set LED Flash as output
	// pinMode(FLASH_LED_PIN, OUTPUT);
	// digitalWrite(FLASH_LED_PIN, flashState);
	
	WRITE_PERI_REG(RTC_CNTL_BROWN_OUT_REG, 0);
	// Init Serial Monitor
	Serial.begin(115200);
	
	// Read LDR voltage divider, GPIO33
	int sensorValue = 100 * analogRead(ldrPin) / 4095;
	Serial.print("sensorValue =");
	Serial.println(sensorValue);
	
	if (sensorValue >= 15) {
		// Config and init the camera
		configInitCamera();
		
		// Connect to Wi-Fi
		WiFi.mode(WIFI_STA);
		Serial.println();
		Serial.print("Connecting to ");
		Serial.println(ssid);
		WiFi.begin(ssid, password);
		while (WiFi.status() != WL_CONNECTED) {
			Serial.print(".");
			delay(500);
		}
		//    Serial.println();
		//    Serial.print("ESP32-CAM IP Address: ");
		//    Serial.println(WiFi.localIP());
		
		sendPhotoTelegram();
	}
	
	esp_sleep_enable_timer_wakeup(6e7); // 1 minute
	
	Serial.println("Going to sleep now");
	delay(1000);
	esp_deep_sleep_start();
	
}

void loop() {
	
}