#include <Wire.h>
#include <RTClib.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <WiFi.h>
#include <WebServer.h>
#include <DHT.h>
#include <DHT_U.h>

// تعاریف سخت‌افزاری و وای‌فای
#define SDA_PIN 21
#define SCL_PIN 22
#define TRIG_PIN 25
#define ECHO_PIN 26
#define BUTTON_PIN 14
#define DHT_PIN 13 // پینی که DHT22 را به آن وصل می‌کنید (مثلاً GPIO 13)
#define DHT_TYPE DHT22 // نوع سنسور
#define LDR_PIN 34   // GPIO34 فقط ورودی آنالوگ
#define PIR_PIN 32   // پین PIR
bool pirState = false; // وضعیت حرکت
#define MQ2_PIN 35  // GPIO آنالوگ برای MQ-2
int mq2Value = 0; // مقدار خوانده شده از سنسور

unsigned long mq2LastReadTime = 0;
const unsigned long mq2ReadInterval = 2000; // هر 2 ثانیه

#define WIFI_SSID "Wokwi-GUEST"
#define WIFI_PASSWORD ""

// تنظیمات OLED (128x64)
#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
#define OLED_I2C_ADDRESS 0x3C
#define PIR_FRAME_DELAY 42
#define PIR_FRAME_WIDTH 64
#define PIR_FRAME_HEIGHT 64
#define PIR_FRAME_COUNT (sizeof(pirFrames) / sizeof(pirFrames[0]))
const byte PROGMEM pirFrames[][512] ={
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,252,0,0,0,0,0,0,3,254,0,0,0,0,0,0,7,7,0,0,0,0,0,0,6,3,0,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,6,3,0,0,0,0,0,0,7,143,0,0,0,0,0,0,3,254,0,0,0,0,0,0,1,252,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,31,224,0,0,0,0,0,0,127,248,0,0,0,0,0,0,248,60,0,0,0,0,0,1,224,28,0,0,0,0,0,7,128,14,0,0,0,0,0,15,0,15,0,0,0,0,0,30,0,15,0,0,0,0,0,56,0,31,128,0,0,0,0,112,112,29,192,0,0,0,0,224,240,25,224,0,0,0,0,225,240,24,252,0,0,0,0,199,240,60,127,128,0,0,1,199,96,60,31,192,0,0,1,206,96,62,1,224,0,0,3,142,224,119,128,224,0,0,3,140,224,115,240,224,0,0,7,28,192,113,255,224,0,0,7,24,192,96,63,224,0,0,6,57,192,224,3,128,0,0,7,49,192,224,0,0,0,0,7,241,192,224,0,0,0,0,3,225,192,112,0,0,0,0,0,129,192,120,0,0,0,0,0,3,224,56,0,0,0,0,0,3,248,28,0,0,0,0,0,3,188,14,0,0,0,0,0,3,30,15,0,0,0,0,0,3,15,7,0,0,0,0,0,7,15,131,128,0,0,0,0,7,31,195,128,0,0,0,0,14,29,225,128,0,0,0,0,30,28,225,128,0,0,0,0,28,24,97,192,0,0,0,0,56,56,97,192,0,0,0,0,112,112,112,192,0,0,0,0,240,240,112,192,0,0,0,0,224,224,48,224,0,0,0,1,193,192,48,224,0,0,0,3,131,128,56,96,0,0,0,3,135,0,56,96,0,0,0,3,135,0,24,96,0,0,0,3,142,0,28,224,0,0,0,1,252,0,15,224,0,0,0,0,248,0,15,192,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,252,0,0,0,0,0,0,3,254,0,0,0,0,0,0,7,7,0,0,0,0,0,0,6,3,0,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,6,3,0,0,0,0,0,0,7,143,0,0,0,0,0,0,3,254,0,0,0,0,0,0,1,252,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,31,240,0,0,0,0,0,0,127,248,0,0,0,0,0,0,248,60,0,0,0,0,0,1,224,28,0,0,0,0,0,7,128,14,0,0,0,0,0,15,0,15,0,0,0,0,0,30,0,15,0,0,0,0,0,60,0,31,128,0,0,0,0,112,112,29,192,0,0,0,0,112,240,25,192,0,0,0,0,225,240,24,248,0,0,0,0,227,240,56,127,0,0,0,0,199,96,60,31,192,0,0,1,198,96,62,3,192,0,0,1,206,224,127,0,224,0,0,3,142,224,119,240,224,0,0,3,156,192,115,255,224,0,0,3,28,192,96,127,192,0,0,7,25,192,224,7,128,0,0,7,57,192,224,0,0,0,0,7,241,192,224,0,0,0,0,3,241,192,112,0,0,0,0,0,193,224,120,0,0,0,0,0,3,240,56,0,0,0,0,0,3,248,28,0,0,0,0,0,3,188,14,0,0,0,0,0,3,30,14,0,0,0,0,0,3,15,7,0,0,0,0,0,3,15,131,0,0,0,0,0,7,15,195,128,0,0,0,0,15,29,195,128,0,0,0,0,14,28,225,128,0,0,0,0,28,24,225,192,0,0,0,0,56,56,97,192,0,0,0,0,120,120,112,192,0,0,0,0,112,112,112,192,0,0,0,0,224,224,112,224,0,0,0,1,193,192,48,224,0,0,0,1,131,192,56,96,0,0,0,3,135,128,56,96,0,0,0,3,135,0,24,96,0,0,0,1,206,0,28,224,0,0,0,1,252,0,15,224,0,0,0,0,248,0,15,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,252,0,0,0,0,0,0,3,254,0,0,0,0,0,0,7,7,0,0,0,0,0,0,6,3,0,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,6,3,0,0,0,0,0,0,7,143,0,0,0,0,0,0,3,254,0,0,0,0,0,0,1,252,0,0,0,0,0,0,0,0,0,0,0,0,0,0,7,0,0,0,0,0,0,0,31,240,0,0,0,0,0,0,127,248,0,0,0,0,0,0,240,28,0,0,0,0,0,1,224,28,0,0,0,0,0,3,192,14,0,0,0,0,0,15,0,14,0,0,0,0,0,30,0,15,0,0,0,0,0,60,16,31,0,0,0,0,0,56,120,31,128,0,0,0,0,112,240,25,192,0,0,0,0,113,240,25,224,0,0,0,0,99,240,56,252,0,0,0,0,227,224,60,127,0,0,0,0,231,224,60,15,128,0,0,0,199,224,126,3,192,0,0,1,206,224,119,193,192,0,0,1,206,192,119,249,192,0,0,3,141,192,97,255,128,0,0,3,157,192,224,63,128,0,0,3,157,192,224,4,0,0,0,3,249,192,224,0,0,0,0,1,249,192,112,0,0,0,0,1,241,224,112,0,0,0,0,0,1,240,56,0,0,0,0,0,3,248,28,0,0,0,0,0,3,184,28,0,0,0,0,0,3,156,14,0,0,0,0,0,3,142,7,0,0,0,0,0,3,143,7,0,0,0,0,0,3,15,131,0,0,0,0,0,7,15,195,128,0,0,0,0,14,29,195,128,0,0,0,0,30,28,225,128,0,0,0,0,60,28,225,192,0,0,0,0,56,56,97,192,0,0,0,0,112,112,112,192,0,0,0,0,224,224,112,224,0,0,0,1,193,224,48,224,0,0,0,1,195,192,56,96,0,0,0,1,131,128,56,96,0,0,0,1,199,0,24,96,0,0,0,1,254,0,28,224,0,0,0,0,252,0,15,224,0,0,0,0,56,0,15,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,252,0,0,0,0,0,0,3,254,0,0,0,0,0,0,7,7,0,0,0,0,0,0,6,3,0,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,6,3,0,0,0,0,0,0,7,143,0,0,0,0,0,0,3,254,0,0,0,0,0,0,1,252,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,192,0,0,0,0,0,0,63,240,0,0,0,0,0,0,127,248,0,0,0,0,0,0,240,28,0,0,0,0,0,1,224,28,0,0,0,0,0,3,192,14,0,0,0,0,0,7,128,14,0,0,0,0,0,14,0,15,0,0,0,0,0,28,48,31,0,0,0,0,0,56,120,31,128,0,0,0,0,56,240,27,128,0,0,0,0,49,240,57,192,0,0,0,0,113,240,57,240,0,0,0,0,115,224,56,252,0,0,0,0,115,224,60,63,0,0,0,0,99,224,124,15,0,0,0,0,231,224,127,3,128,0,0,0,231,192,127,195,128,0,0,0,199,192,103,255,0,0,0,1,199,192,224,255,0,0,0,1,207,192,224,30,0,0,0,1,223,192,224,0,0,0,0,0,253,192,112,0,0,0,0,0,249,224,112,0,0,0,0,0,1,224,56,0,0,0,0,0,1,240,56,0,0,0,0,0,1,184,28,0,0,0,0,0,1,156,28,0,0,0,0,0,1,158,14,0,0,0,0,0,3,142,6,0,0,0,0,0,3,143,7,0,0,0,0,0,3,143,135,0,0,0,0,0,7,15,131,128,0,0,0,0,14,13,195,128,0,0,0,0,28,28,193,128,0,0,0,0,56,60,225,192,0,0,0,0,112,56,225,192,0,0,0,0,240,112,112,224,0,0,0,0,224,224,112,224,0,0,0,0,193,192,56,96,0,0,0,0,195,128,56,96,0,0,0,0,231,0,24,96,0,0,0,0,255,0,31,224,0,0,0,0,126,0,15,192,0,0,0,0,0,0,7,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
  {0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,1,252,0,0,0,0,0,0,3,254,0,0,0,0,0,0,7,7,0,0,0,0,0,0,6,3,0,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,14,3,128,0,0,0,0,0,7,3,0,0,0,0,0,0,3,223,0,0,0,0,0,0,3,254,0,0,0,0,0,0,0,248,0,0,0,0,0,0,0,0,0,0,0,0,0,0,15,192,0,0,0,0,0,0,63,240,0,0,0,0,0,0,127,248,0,0,0,0,0,0,240,28,0,0,0,0,0,1,224,12,0,0,0,0,0,3,192,14,0,0,0,0,0,7,128,14,0,0,0,0,0,15,0,30,0,0,0,0,0,30,24,31,0,0,0,0,0,28,56,31,0,0,0,0,0,24,112,31,0,0,0,0,0,56,240,59,128,0,0,0,0,57,224,59,192,0,0,0,0,57,224,57,240,0,0,0,0,49,224,56,252,0,0,0,0,51,224,120,62,0,0,0,0,115,224,124,14,0,0,0,0,115,192,127,6,0,0,0,0,115,192,111,206,0,0,0,0,103,192,227,254,0,0,0,0,103,192,224,124,0,0,0,0,231,192,224,0,0,0,0,0,127,192,112,0,0,0,0,0,127,224,112,0,0,0,0,0,57,224,48,0,0,0,0,0,1,240,56,0,0,0,0,0,1,248,24,0,0,0,0,0,1,248,28,0,0,0,0,0,1,220,12,0,0,0,0,0,1,206,14,0,0,0,0,0,1,206,14,0,0,0,0,0,3,143,7,0,0,0,0,0,7,143,135,0,0,0,0,0,15,15,131,128,0,0,0,0,30,15,195,128,0,0,0,0,60,29,193,192,0,0,0,0,120,56,225,192,0,0,0,0,112,112,224,224,0,0,0,0,224,240,112,224,0,0,0,0,225,224,56,96,0,0,0,0,227,192,56,96,0,0,0,0,127,128,28,96,0,0,0,0,127,0,31,224,0,0,0,0,30,0,15,192,0,0,0,0,0,0,7,128,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0},
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};

WebServer server(80);

// ساخت آبجکت‌های سخت‌افزاری
RTC_DS3231 rtc;
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);
DHT dht(DHT_PIN, DHT_TYPE);
// --- DHT variables ---
unsigned long dhtLastReadTime = 0;
const unsigned long dhtReadInterval = 2000; // هر 2 ثانیه

float lastHumidity = 0.0;
float lastTemperature = 0.0;
// --- LDR variables ---
int ldrValue = 0;
unsigned long ldrLastReadTime = 0;
const unsigned long ldrReadInterval = 1000; // هر ۱ ثانیه




// ----------------------------------------------------------------------
// --- متغیرهای وضعیت و تعاریف سراسری ---
// ----------------------------------------------------------------------
bool childWasSleeping = false;
long lastDistance = 0; 

unsigned long heartDelayStart = 0;
bool heartDelayActive = false;
bool heartAnimationRunning = false;
uint8_t heartFrame = 0;
const uint8_t heartFrames = 8;

// وضعیت قرص‌ها
enum PillState { WAIT_PILL1, PILL1_TAKEN, PILL2_READY, PILL2_TAKEN };
PillState pillState = WAIT_PILL1;

// حالت سیستم
enum SystemState { 
    WAIT_ULTRASONIC, 
    HAND_ANIMATION, 
    HEART_ANIMATION, 
    SHOW_TIME_PILLS 
};
SystemState systemState = WAIT_ULTRASONIC;

// --- Hand Washing Animation (بدون تغییر) ---
uint8_t currentStep = 0;
uint16_t frameInStep = 0;
const uint8_t TOTAL_STEPS = 7;
const uint8_t framesPerStep[7] = {8, 8, 8, 67, 8, 8, 8};

void displayPrepare() {
    display.clearDisplay();
    display.setTextColor(SSD1306_WHITE);
    display.setTextSize(1); 
    display.setCursor(0, 0);
}

// --- توابع Hand Drawing و Animation (بدون تغییر) ---

void drawHand(uint8_t x, uint8_t y, bool left) {
    display.fillRoundRect(x + (left ? 0 : 6), y + 8, 12, 16, 2, SSD1306_WHITE);
    display.fillRoundRect(x + (left ? 2 : 8), y + 2, 2, 8, 1, SSD1306_WHITE);
    display.fillRoundRect(x + (left ? 5 : 11), y, 2, 10, 1, SSD1306_WHITE);
    display.fillRoundRect(x + (left ? 8 : 14), y + 1, 2, 9, 1, SSD1306_WHITE);
    display.fillRoundRect(x + (left ? 11 : 17), y + 3, 2, 7, 1, SSD1306_WHITE);
    display.fillRoundRect(x + (left ? -2 : 4), y + 12, 4, 8, 1, SSD1306_WHITE);
}

void drawWater(uint8_t frame) {
    for (int i = 0; i < 4; i++) {
        uint8_t x = 58 + i - 2;
        uint8_t y = 22 + i * 4 + (frame % 3);
        display.drawPixel(x, y, SSD1306_WHITE);
    }
}

void drawBubbles(uint8_t frame) {
    for (int i = 0; i < 3; i++) {
        uint8_t x = 45 + i * 15;
        uint8_t y = 35 + (frame + i) % 4;
        display.drawCircle(x, y, 2, SSD1306_WHITE);
    }
}

// --- Steps ---
void step1_water(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(25, 5);
    display.print("Turn on water");
    display.fillRect(50, 15, 20, 4, SSD1306_WHITE); // faucet top
    display.fillRect(58, 19, 4, 6, SSD1306_WHITE);  // faucet body
    if(frame > 3) drawWater(frame);
    uint8_t offset = frame < 6 ? frame : 6;
    drawHand(35 + (6 - offset), 40, true);
    drawHand(60 - (6 - offset), 40, false);
}

void step2_wet(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(30, 5);
    display.print("Wet hands");
    display.fillRect(50, 15, 20, 4, SSD1306_WHITE); 
    display.fillRect(58, 19, 4, 6, SSD1306_WHITE);
    drawWater(frame);
    drawHand(41, 40, true); 
    drawHand(54, 40, false);
}

void step3_soap(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(30, 5);
    display.print("Apply soap");
    display.fillRoundRect(15, 20, 8, 12, 2, SSD1306_WHITE); // Soap dispenser body
    display.fillRoundRect(17, 17, 4, 4, 1, SSD1306_WHITE);  // Dispenser pump
    if(frame % 8 < 4) display.drawCircle(19, 32 + (frame % 4), 1, SSD1306_WHITE); // Soap drop
    drawHand(50, 40, true); 
    drawHand(63, 40, false);
    if(frame > 4) display.drawCircle(55, 45, 1, SSD1306_WHITE); // Soap on hand
}

void step4_scrub(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(25, 5);
    display.print("Scrub 20 sec");
    uint8_t motion = (frame % 4 < 2) ? 1 : 0;
    drawHand(45 + motion, 40 - motion, true);
    drawHand(58 - motion, 40 + motion, false);
    drawBubbles(frame);

    display.setTextSize(2);
    display.setCursor(85, 25);
    display.print("20");
    display.setTextSize(1); 
    
    display.drawRect(88, 38, 30, 8, SSD1306_WHITE);
    long progress = map(frame, 0, framesPerStep[3] - 1, 0, 28);
    display.fillRect(89, 39, progress, 6, SSD1306_WHITE);
}

void step5_rinse(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(35, 5);
    display.print("Rinse");
    display.fillRect(50, 15, 20, 4, SSD1306_WHITE); 
    display.fillRect(58, 19, 4, 6, SSD1306_WHITE);
    drawWater(frame);
    drawHand(41, 40, true); 
    drawHand(54, 40, false);
    if(frame < 6) drawBubbles(frame);
}

void step6_dry(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(25, 5);
    display.print("Dry with towel");
    display.drawRect(20, 25, 20, 12, SSD1306_WHITE);
    uint8_t bounce = (frame % 4 < 2) ? 1 : 0;
    drawHand(50, 35 + bounce, true); 
    drawHand(63, 35 + bounce, false);
    if(frame % 6 < 3) display.fillRect(45, 40, 20, 8, SSD1306_WHITE);
}

void step7_done(uint8_t frame){
    display.setTextSize(1);
    display.setCursor(25, 5);
    display.print("Hands clean!");
    drawHand(45, 20, true); 
    drawHand(58, 20, false);
    if(frame % 8 < 4){ 
        display.drawPixel(40, 30, SSD1306_WHITE); 
        display.drawPixel(70, 32, SSD1306_WHITE); 
        display.drawPixel(55, 28, SSD1306_WHITE);
    }
    display.setCursor(35, 55);
    display.print("Well done!");
}

void drawAnimation(){
    switch(currentStep){
        case 0: step1_water(frameInStep); break;
        case 1: step2_wet(frameInStep); break;
        case 2: step3_soap(frameInStep); break;
        case 3: step4_scrub(frameInStep); break;
        case 4: step5_rinse(frameInStep); break;
        case 5: step6_dry(frameInStep); break;
        case 6: step7_done(frameInStep); break;
    }
}


// --- Time and Pills Display ---
void drawTimeAndPills(){
    // 1. Time
    DateTime now = rtc.now();
    char buf[20]; 
    sprintf(buf, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());
    
    display.setTextSize(2); 
    display.setCursor(0, 0);
    display.print(buf);
    
    // 2. Pill Status
    display.setTextSize(1); 
    display.setCursor(0, 20);

    switch(pillState){
        case WAIT_PILL1: display.print("Take Pill 1"); break;
        case PILL1_TAKEN: display.print("Pill 1 Taken"); break;
        case PILL2_READY: display.print("Take Pill 2"); break;
        case PILL2_TAKEN: display.print("All Done"); break;
    }
    
    display.setCursor(0, 40);
    display.print("Monitor Active");
}


// --- Ultrasonic, Heart Animation (بدون تغییر) ---

long readUltrasonic() {
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);
    long duration = pulseIn(ECHO_PIN, HIGH);
    long distance = duration * 0.034 / 2;
    return distance;
}

void drawHeart(int x, int y, uint8_t size) {
    int r = size * 2;
    display.fillCircle(x - r/2, y - r/2, r/2, SSD1306_WHITE);
    display.fillCircle(x + r/2, y - r/2, r/2, SSD1306_WHITE);
    display.fillTriangle(
        x - r, y - r/4,
        x + r, y - r/4,
        x, y + r,
        SSD1306_WHITE);
}

void drawHeartAnimation() {
    display.setTextSize(1);
    display.setCursor(25, 5);
    display.print("Heart Pill");
    
    uint8_t scale = 2 + (heartFrame % heartFrames); 
    drawHeart(64, 32, scale);
    
    heartFrame++;
    if(heartFrame >= heartFrames * 2) { 
        heartFrame = 0;
        pillState = PILL2_READY;
        heartAnimationRunning = false; 
        systemState = SHOW_TIME_PILLS;
    }
}


// --- Web Server Handlers (بروزرسانی شده برای نمایش DHT) ---
void handleRoot() {

    // --- وضعیت MQ-2 / هشدار ترک مکان ---
    String mq2_status = ""; 
    if (mq2Value > 1000) {  // Threshold = 1000
        mq2_status = "⚠️ Gas High! Leave the area!";
    } else {
        mq2_status = ""; // هیچ هشداری
    }

    // --- وضعیت فاصله ---
    String distance_status;
    String status_color;
    String status_emoji;

    if (lastDistance <= 50) {
        distance_status = "Khab-e Amigh (Deep Sleep)";
        status_color = "#2ecc71"; // سبز
        status_emoji = "😴";
    } else if (lastDistance >= 150) {
        distance_status = "Bidari/Khoruj (Waking/Out of Range)";
        status_color = "#e74c3c"; // قرمز
        status_emoji = "🚨";
    } else {
        distance_status = "Dar hale Paiesh (Monitoring Safe Zone)";
        status_color = "#f1c40f"; // زرد
        status_emoji = "👀";
    }

    // --- وضعیت نور و هشدار ویتامین D ---
    String light_status;
    String vitaminD_warning = "";

    if (ldrValue < 1000) {
        light_status = "Dark 🌙";
        vitaminD_warning = "⚠️ Low sunlight! Consider Vitamin D ☀️";
    } else if (ldrValue < 2500) {
        light_status = "Normal ☁️";
        vitaminD_warning = "";
    } else {
        light_status = "Bright ☀️";
        vitaminD_warning = "";
    }

    // --- وضعیت PIR / حرکت ---
    String pir_status;
    if (pirState) {
        pir_status = "کودک به زمین فوتبال آمد و باید در ابتدا آب بنوشد 💧";
    } else {
        pir_status = ""; // اگر حرکتی نیست چیزی نمایش نده
    }

    // --- ساخت HTML ---
    String html = R"=====( 
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>ESP32 Child Monitor</title>
<style>
body { font-family: 'Tahoma', sans-serif; text-align: center; background-color: #f4f7f6; color: #333; padding: 10px; }
.container { max-width: 450px; margin: 20px auto; background: #ffffff; padding: 25px; border-radius: 12px; box-shadow: 0 6px 12px rgba(0,0,0,0.15); }
h2 { color: #2c3e50; border-bottom: 2px solid #ecf0f1; padding-bottom: 10px; }
.data-card { margin-top: 20px; padding: 15px; border-radius: 8px; font-weight: bold; transition: all 0.3s ease; font-size: 1.1em; }
.alert-card { margin-top: 20px; padding: 15px; border-radius: 8px; font-weight: bold; background-color: #e74c3c; color: white; font-size: 1.1em; }
.main-value { font-size: 2.5em; color: #3498db; margin: 10px 0; font-weight: 700; }
.ip-info { font-size: 0.8em; color: #7f8c8d; margin-top: 15px; }
.rtl-text { direction: rtl; }
.dht-row { display: flex; justify-content: space-around; margin-top: 20px; padding: 10px 0; border-top: 1px solid #ecf0f1; }
.dht-item { flex: 1; padding: 10px; border-right: 1px solid #ecf0f1; }
.dht-item:last-child { border-right: none; }
.dht-label { font-size: 0.9em; color: #7f8c8d; }
.dht-value { font-size: 1.5em; color: #2980b9; font-weight: bold; margin-top: 5px; }
</style>
<meta http-equiv="refresh" content="5"> 
</head>
<body>
<div class="container">
<h2 class="rtl-text">Child Monitoring System (ESP32) 👋</h2>

<!-- هشدار PIR / حرکت در بالای صفحه -->
<div class="alert-card">%PIR%</div>

<!-- هشدار MQ-2 / ترک مکان -->
<div class="alert-card">%MQ2_STATUS%</div>

<h3 class="rtl-text">Detected Distance (Sleep)</h3>
<div class="main-value">%DISTANCE% cm</div>
<div class="data-card" style="background-color: %STATUS_COLOR%; color: white;">
%STATUS_EMOJI% <span class="rtl-text">%DISTANCE_STATUS%</span> %STATUS_EMOJI%
</div>

<h3 class="rtl-text" style="margin-top: 30px;">Environmental Conditions (DHT22, LDR & Gas)</h3>
<div class="dht-row">
    <div class="dht-item">
        <div class="dht-label rtl-text">Temperature</div>
        <div class="dht-value">%TEMP% &deg;C</div>
    </div>
    <div class="dht-item">
        <div class="dht-label rtl-text">Humidity</div>
        <div class="dht-value">%HUMIDITY% %%</div>
    </div>
    <div class="dht-item">
        <div class="dht-label rtl-text">Light</div>
        <div class="dht-value">%LIGHT%</div>
    </div>
    <div class="dht-item">
        <div class="dht-label rtl-text">Gas (MQ-2)</div>
        <div class="dht-value">%MQ2%</div>
    </div>
</div>

<div class="data-card" style="background-color:#f39c12; color:white; margin-top:10px;">
%VITAMIN_D%
</div>

<p class="rtl-text" style="margin-top: 30px;">
<b>Pill Status:</b> %PILL_STATE%
</p>

<hr>
<p class="ip-info">
<b>IP Address:</b> %IP% | 
<b>Server Time:</b> %TIME%
</p>
</div>
</body>
</html>
)=====";

    // --- جایگزینی مقادیر ---
    DateTime now = rtc.now();
    char time_buf[20];
    sprintf(time_buf, "%02d:%02d:%02d", now.hour(), now.minute(), now.second());

    String pill_status_text;
    switch(pillState){
        case WAIT_PILL1: pill_status_text = "Ready for Pill 1"; break;
        case PILL1_TAKEN: pill_status_text = "Pill 1 Taken - Wait for Pill 2"; break;
        case PILL2_READY: pill_status_text = "Ready for Pill 2"; break;
        case PILL2_TAKEN: pill_status_text = "Finished (All pills taken)"; break;
    }

    html.replace("%IP%", WiFi.localIP().toString());
    html.replace("%DISTANCE%", String(lastDistance));
    html.replace("%DISTANCE_STATUS%", distance_status);
    html.replace("%STATUS_COLOR%", status_color);
    html.replace("%STATUS_EMOJI%", status_emoji);
    html.replace("%TIME%", time_buf);
    html.replace("%PILL_STATE%", pill_status_text);
    html.replace("%TEMP%", String(lastTemperature, 1));
    html.replace("%HUMIDITY%", String(lastHumidity, 1));
    html.replace("%LIGHT%", light_status);
    html.replace("%VITAMIN_D%", vitaminD_warning);
    html.replace("%PIR%", pir_status);

    // ✅ جایگزینی MQ-2
    html.replace("%MQ2%", String(mq2Value));
    html.replace("%MQ2_STATUS%", mq2_status);

    // --- ارسال صفحه ---
    server.send(200, "text/html", html);
}


// --- Setup ---
void setup(){
Serial.begin(115200);

    // پین‌های سنسور و دکمه
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);
    pinMode(BUTTON_PIN, INPUT_PULLUP);

    pinMode(PIR_PIN, INPUT);

    
    // [جدید] مقداردهی اولیه DHT
    dht.begin();
    // I2C
    Wire.begin(SDA_PIN, SCL_PIN);

    // OLED Initialization
    if (!display.begin(SSD1306_SWITCHCAPVCC, OLED_I2C_ADDRESS)) {
        Serial.println(F("SSD1306 allocation failed"));
        while (true);
    }
    
    //... (نمایش اولیه)

    // RTC Initialization
    if (!rtc.begin()){
        Serial.println("Couldn't find RTC");
        while(true);
    }
    
    // ---------- WiFi ----------
    WiFi.begin(WIFI_SSID, WIFI_PASSWORD);
    
    //... (فرآیند اتصال WiFi)
    
    int wifi_retries = 0;
    while (WiFi.status() != WL_CONNECTED && wifi_retries < 20) {
        delay(500);
        Serial.print(".");
        wifi_retries++;
    }

    Serial.println();

    if (WiFi.status() == WL_CONNECTED) {
        Serial.println("WiFi Connected!");
        Serial.print("IP Address: ");
        Serial.println(WiFi.localIP());

        // نمایش روی OLED
        display.clearDisplay();
        display.setCursor(0, 20);
        display.print("WiFi Connected!");
        display.setCursor(0, 35);
        display.print(WiFi.localIP().toString().c_str());
        display.display();
    } else {
        Serial.println("WiFi Failed to Connect!");
        display.clearDisplay();
        display.setCursor(0, 20);
        display.print("WiFi Failed!");
        display.display();
    }


    server.on("/", handleRoot);
    server.begin();
}

// --- Main Loop (بروزرسانی شده) ---
void loop() {
displayPrepare();

server.handleClient();

// --- Read DHT22 ---
if (millis() - dhtLastReadTime >= dhtReadInterval) {
    float h = dht.readHumidity();
    float t = dht.readTemperature(); // Celsius

    if (!isnan(h) && !isnan(t)) {
        lastHumidity = h;
        lastTemperature = t;

        Serial.print("Humidity: ");
        Serial.print(lastHumidity);
        Serial.print(" %\t Temperature: ");
        Serial.print(lastTemperature);
        Serial.println(" *C");
    }
    dhtLastReadTime = millis();
}

// --- Read LDR ---
if (millis() - ldrLastReadTime >= ldrReadInterval) {
    ldrValue = analogRead(LDR_PIN);
    ldrLastReadTime = millis();

    Serial.print("LDR: ");
    Serial.println(ldrValue);
}
// --- Read MQ-2 ---
if (millis() - mq2LastReadTime >= mq2ReadInterval) {
    mq2Value = analogRead(MQ2_PIN);

    Serial.print("MQ2 Value: ");
    Serial.println(mq2Value);

    mq2LastReadTime = millis();
}


pirState = digitalRead(PIR_PIN);  // HIGH وقتی حرکت شناسایی شد

// اگر PIR تحریک شد، انیمیشن PIR را اجرا کن
if (pirState == HIGH) {
    for (int i = 0; i < PIR_FRAME_COUNT; i++) {
        display.clearDisplay();

        // مرکز کردن انیمیشن
        int x = (SCREEN_WIDTH - PIR_FRAME_WIDTH) / 2;
        int y = (SCREEN_HEIGHT - PIR_FRAME_HEIGHT) / 2;

        display.drawBitmap(x, y, pirFrames[i], PIR_FRAME_WIDTH, PIR_FRAME_HEIGHT, SSD1306_WHITE);
        display.display();
        delay(PIR_FRAME_DELAY);
    }
}





    switch (systemState) {

        case WAIT_ULTRASONIC: {
            long distance = readUltrasonic();
            lastDistance = distance; 
            
            display.setCursor(0, 10);
            display.print("Monitoring sleep...");
            char buf[40];
            sprintf(buf, "Dist: %ld cm", distance);
            display.setCursor(0, 25);
            display.print(buf);
            
            display.setCursor(0, 40);
            display.print("System Active");


            if (distance <= 50) {
                childWasSleeping = true;
                display.setCursor(0, 55);
                display.print("Sleeping detected");
            }

            if (childWasSleeping && distance >= 150) {
                systemState = HAND_ANIMATION;
                currentStep = 0;
                frameInStep = 0;
                childWasSleeping = false;
            }
            break;
        }

        case HAND_ANIMATION:
            drawAnimation();
            frameInStep++;

            if (frameInStep >= framesPerStep[currentStep]) {
                frameInStep = 0;
                currentStep++;

                if (currentStep >= TOTAL_STEPS) {
                    systemState = SHOW_TIME_PILLS;
                }
            }
            break;

        case HEART_ANIMATION:
            if (heartAnimationRunning) {
                drawHeartAnimation(); 
            } 
            else if (heartDelayActive) {
                if (millis() - heartDelayStart >= 5000) {
                    heartAnimationRunning = true;
                    heartDelayActive = false;
                    heartFrame = 0;
                } else {
                    display.setCursor(20, 30);
                    display.print("Wait 5 seconds...");
                }
            }
            break;

        case SHOW_TIME_PILLS:
            drawTimeAndPills();
            break;
    }

    display.display();

    // --- مدیریت دکمه (بدون تغییر) ---
    if (digitalRead(BUTTON_PIN) == LOW) {
        delay(50);
        while (digitalRead(BUTTON_PIN) == LOW);

        if (pillState == WAIT_PILL1) {
            pillState = PILL1_TAKEN;
            heartDelayActive = true;
            heartDelayStart = millis();
            systemState = HEART_ANIMATION;
        } 
        else if (pillState == PILL1_TAKEN && heartAnimationRunning) {
            heartAnimationRunning = false;
            pillState = PILL2_READY;
            systemState = SHOW_TIME_PILLS;
        } 
        else if (pillState == PILL2_READY) {
            pillState = PILL2_TAKEN;
        }
    }

    delay(150);
}