/*
  SMART PLANT WATERING SYSTEM - ESP32 on Wokwi
  ============================================
  CONNECTIONS:
  - Potentiometer: Left→3.3V, Middle→34, Right→GND
  - LED: Anode→Resistor→D13, Cathode→GND
  - Pushbutton: One pin→D12, Other pin→GND
*/

#include <WiFi.h>

// Pin Definitions - MATCH YOUR CONNECTIONS
const int SOIL_SENSOR_PIN = 34;    // Potentiometer middle pin → pin "34"
const int PUMP_RELAY_PIN = 13;     // LED via resistor → pin "D13"
const int MANUAL_BUTTON_PIN = 12;  // Pushbutton → pin "D12"

// Calibration values
const int DRY_THRESHOLD = 3000;    // Above this = soil dry (pump ON)
const int WET_THRESHOLD = 1500;    // Below this = soil wet (pump OFF)

// System variables
int soilMoistureValue = 0;
bool isPumpRunning = false;
bool manualOverrideActive = false;
unsigned long manualStartTime = 0;
const unsigned long MANUAL_RUN_TIME = 5000;  // 5 seconds

// WiFi credentials
const char* ssid = "Wokwi-GUEST";
const char* password = "";

WiFiServer server(80);

void setup() {
  Serial.begin(115200);
  delay(1000);
  
  // Configure pins
  pinMode(SOIL_SENSOR_PIN, INPUT);
  pinMode(PUMP_RELAY_PIN, OUTPUT);
  pinMode(MANUAL_BUTTON_PIN, INPUT_PULLUP);
  
  // Start with pump OFF
  digitalWrite(PUMP_RELAY_PIN, LOW);
  isPumpRunning = false;
  
  // Connect to WiFi
  WiFi.begin(ssid, password);
  Serial.print("Connecting to WiFi");
  int attempts = 0;
  while (WiFi.status() != WL_CONNECTED && attempts < 20) {
    delay(500);
    Serial.print(".");
    attempts++;
  }
  
  if (WiFi.status() == WL_CONNECTED) {
    Serial.println("\nWiFi connected!");
    Serial.print("IP address: ");
    Serial.println(WiFi.localIP());
    server.begin();
  } else {
    Serial.println("\nWiFi not available - continuing offline");
  }
  
  Serial.println("\n=== SMART PLANT WATERING SYSTEM ===");
  Serial.println("Turn potentiometer:");
  Serial.println("  CLOCKWISE (high value) = DRY → Pump ON");
  Serial.println("  COUNTER-CLOCKWISE (low value) = WET → Pump OFF");
  Serial.println("Press button for manual watering (5 seconds)");
  Serial.println("====================================\n");
}

void loop() {
  // Read soil moisture
  soilMoistureValue = analogRead(SOIL_SENSOR_PIN);
  
  // Check manual button
  if (digitalRead(MANUAL_BUTTON_PIN) == LOW && !manualOverrideActive) {
    manualOverrideActive = true;
    manualStartTime = millis();
    digitalWrite(PUMP_RELAY_PIN, HIGH);
    isPumpRunning = true;
    Serial.println("\n*** MANUAL OVERRIDE: Pump ON for 5 seconds ***");
    delay(200);  // Debounce
  }
  
  // Handle manual override timeout
  if (manualOverrideActive && (millis() - manualStartTime >= MANUAL_RUN_TIME)) {
    manualOverrideActive = false;
    digitalWrite(PUMP_RELAY_PIN, LOW);
    isPumpRunning = false;
    Serial.println("Manual watering complete - Returning to automatic mode");
  }
  
  // Automatic control (if not in manual mode)
  if (!manualOverrideActive) {
    if (soilMoistureValue > DRY_THRESHOLD && !isPumpRunning) {
      digitalWrite(PUMP_RELAY_PIN, HIGH);
      isPumpRunning = true;
      Serial.println("🌱 SOIL DRY! Pump activated (LED ON)");
    } 
    else if (soilMoistureValue < WET_THRESHOLD && isPumpRunning) {
      digitalWrite(PUMP_RELAY_PIN, LOW);
      isPumpRunning = false;
      Serial.println("✅ Soil moist. Pump OFF (LED OFF)");
    }
  }
  
  // Display status
  int moisturePercent = map(soilMoistureValue, 0, 4095, 100, 0);
  moisturePercent = constrain(moisturePercent, 0, 100);
  
  Serial.print("Soil: ");
  Serial.print(soilMoistureValue);
  Serial.print(" (");
  Serial.print(moisturePercent);
  Serial.print("%) | Pump: ");
  Serial.print(isPumpRunning ? "🔴 ON" : "🟢 OFF");
  if (manualOverrideActive) {
    unsigned long remaining = (MANUAL_RUN_TIME - (millis() - manualStartTime)) / 1000;
    Serial.print(" | MANUAL: ");
    Serial.print(remaining);
    Serial.print("s left");
  }
  Serial.println();
  
  // Handle web requests
  if (WiFi.status() == WL_CONNECTED) {
    WiFiClient client = server.available();
    if (client) {
      String request = client.readStringUntil('\r');
      client.flush();
      client.println("HTTP/1.1 200 OK");
      client.println("Content-Type: text/html");
      client.println("Connection: close");
      client.println();
      client.println("<!DOCTYPE html><html>");
      client.println("<head><meta http-equiv='refresh' content='5'/></head>");
      client.println("<body>");
      client.println("<h1>🌱 Smart Plant Watering System</h1>");
      client.println("<p>Soil Moisture: " + String(soilMoistureValue) + "</p>");
      client.println("<p>Pump Status: " + String(isPumpRunning ? "RUNNING" : "OFF") + "</p>");
      client.println("</body></html>");
      client.stop();
    }
  }
  
  delay(1000);
}