#include <LiquidCrystal_I2C.h>
#include "DHT.h"

// --- CONFIGURATION ---
#define DHTPIN 4        // Digital pin connected to the DHT sensor
#define DHTTYPE DHT22   // DHT 22 (AM2302)

// Initialize DHT sensor
DHT dht(DHTPIN, DHTTYPE);

// Initialize LCD (Address 0x27 is standard, change if yours is 0x3F)
int lcdColumns = 16;
int lcdRows = 2;
LiquidCrystal_I2C lcd(0x27, lcdColumns, lcdRows);  

// --- CUSTOM CHARACTER BITMAPS ---
byte pacmanOpen[] = { B01110, B11101, B11110, B11100, B11110, B11111, B01110, B00000 };
byte pacmanClosed[] = { B01110, B11111, B11111, B11111, B11111, B11111, B01110, B00000 };
byte ghost[] = { B01110, B11111, B10101, B11111, B11111, B11111, B10101, B00000 };
byte dot[] = { B00000, B00000, B00000, B00110, B00110, B00000, B00000, B00000 };
// A small degree symbol
byte degree[] = { B00110, B01001, B01001, B00110, B00000, B00000, B00000, B00000 };

void setup(){
  Serial.begin(9600);
  
  // Start Hardware
  dht.begin();
  lcd.init();
  lcd.backlight();

  // Create Custom Characters
  lcd.createChar(0, pacmanOpen);
  lcd.createChar(1, pacmanClosed);
  lcd.createChar(2, ghost);
  lcd.createChar(3, dot);
  lcd.createChar(4, degree);
  
  // Intro
  lcd.setCursor(0, 0);
  lcd.print("Sensors Init...");
  delay(1000);
  lcd.clear();
}

void loop(){
  // --- 1. READ DATA ---
  // Reading takes about 250ms
  float h = dht.readHumidity();
  float t = dht.readTemperature(); // Celsius

  // Check if any reads failed
  if (isnan(h) || isnan(t)) {
    lcd.clear();
    lcd.print("DHT Sensor Fail");
    delay(2000);
    return;
  }

  // --- 2. DISPLAY TEMP/HUMIDITY (Typewriter Effect) ---
  lcd.clear();
  
  // Construct Strings
  String tempLine = "Temp: " + String(t, 1); // "Temp: 24.5"
  String humLine  = "Hum:  " + String(h, 1) + "%";
  
  // Print Top Row (Typewriter)
  animTypewriter(tempLine, 0); 
  // Print Degree Symbol manually after the number
  lcd.write(4); 
  lcd.print("C");
  
  // Print Bottom Row (Typewriter)
  animTypewriter(humLine, 1);
  
  // Wait to let user read
  delay(3000);

  // --- 3. PACMAN WIPE (Cleans the screen) ---
  animPacman(); 
  lcd.clear();

  // --- 4. CALCULATE HEAT INDEX (Real Feel) ---
  float hic = dht.computeHeatIndex(t, h, false);
  
  String hiLine1 = "Feels Like:";
  String hiLine2 = String(hic, 1);
  
  // --- 5. DISSOLVE EFFECT ---
  // This function prints the text, waits, then vaporizes it
  animDissolveHeatIndex(hiLine1, hiLine2);
  
  delay(500);
}

// ------------------------------------------------
// ANIMATION FUNCTIONS
// ------------------------------------------------

// EFFECT 1: Typewriter
void animTypewriter(String text, int row) {
  lcd.setCursor(0, row);
  for (int i = 0; i < text.length(); i++) {
    lcd.print(text.charAt(i));
    delay(50); // Typing speed
  }
}

// EFFECT 2: Pacman Chase (Used as a transition)
void animPacman() {
  // 1. Fill bottom row with dots to eat
  for(int i=0; i<16; i++) {
    lcd.setCursor(i, 1);
    lcd.write(3); 
  }

  // 2. The Chase
  for (int i = 0; i < 16; i++) {
    // Draw Ghost
    if (i > 0) {
      lcd.setCursor(i - 1, 1);
      lcd.write(2); 
      // Erase behind ghost
      if (i > 1) {
        lcd.setCursor(i - 2, 1);
        lcd.print(" ");
      }
    }

    // Draw Pacman
    lcd.setCursor(i, 1);
    lcd.write(0); // Open
    delay(80);
    lcd.setCursor(i, 1);
    lcd.write(1); // Closed
    delay(80);
  }
}

// EFFECT 3: Dissolve (Specifically for Heat Index display)
void animDissolveHeatIndex(String line1, String line2) {
  // Print the text normally first
  lcd.setCursor(0, 0); lcd.print(line1);
  lcd.setCursor(0, 1); lcd.print(line2); 
  lcd.write(4); lcd.print("C"); // Add degree symbol

  delay(2500); // Hold the message

  // Start Dissolving
  int cleared[32]; 
  for(int i=0; i<32; i++) cleared[i] = 0;
  
  int totalChars = 32;
  int erasedCount = 0;

  while(erasedCount < totalChars) {
    int r = random(0, 32); 
    
    if(cleared[r] == 0) {
      int col = r % 16;
      int row = (r < 16) ? 0 : 1;
      
      lcd.setCursor(col, row);
      lcd.print(" "); 
      
      cleared[r] = 1; 
      erasedCount++;
      delay(15); 
    }
  }
}