#include <Arduino.h>
#ifndef CONFIG_H
#define CONFIG_H

#define THRESHOLD 20
#define BAUD_RATE 9600

#endif

// ======================================================
// Efficient Solar Lighting System
// ATmega328P (Arduino UNO)
// ======================================================

// ---------------- Pin Definitions ----------------

// Limit Switch Pins (Using INPUT_PULLUP)
#define eastSw 5
#define westSw 6
#define northSw 7
#define southSw 8

// Motor 1 (East-West)
#define m1a 9     // Clockwise
#define m1b 10    // Counterclockwise

// Motor 2 (North-South)
#define m2a 11    // Clockwise
#define m2b 12    // Counterclockwise

// LED Indicator
#define led 13

// ---------------- Global Variables ----------------

int eastRes = 0;
int westRes = 0;
int northRes = 0;
int southRes = 0;

bool swEast  = HIGH;
bool swWest  = HIGH;
bool swNorth = HIGH;
bool swSouth = HIGH;

// ---------------- Function Prototypes ----------------

void getLdrStatus();
void getSwitchStatus();
void stopMotors();

// ======================================================
// Setup
// ======================================================
void setup() {

  Serial.begin(BAUD_RATE);
  delay(200);

  pinMode(led, OUTPUT);

  pinMode(eastSw, INPUT_PULLUP);
  pinMode(westSw, INPUT_PULLUP);
  pinMode(northSw, INPUT_PULLUP);
  pinMode(southSw, INPUT_PULLUP);

  pinMode(m1a, OUTPUT);
  pinMode(m1b, OUTPUT);
  pinMode(m2a, OUTPUT);
  pinMode(m2b, OUTPUT);

  stopMotors();

  Serial.println("Solar Lighting System Started");
}

// ======================================================
// Main Loop
// ======================================================
void loop() {

  getLdrStatus();
  getSwitchStatus();

  // -------- East to West Movement --------
  if (eastRes > westRes + THRESHOLD) {
    if (swWest == HIGH) {
      digitalWrite(m1a, HIGH);
      delay(50);
      digitalWrite(m1a, LOW);
      Serial.println("Moving East to West");
    }
  }

  // -------- West to East Movement --------
  if (westRes > eastRes + THRESHOLD) {
    if (swEast == HIGH) {
      digitalWrite(m1b, HIGH);
      delay(50);
      digitalWrite(m1b, LOW);
      Serial.println("Moving West to East");
    }
  }

  // -------- North to South Movement --------
  if (northRes > southRes + THRESHOLD) {
    if (swSouth == HIGH) {
      digitalWrite(m2a, HIGH);
      delay(50);
      digitalWrite(m2a, LOW);
      Serial.println("Moving North to South");
    }
  }

  // -------- South to North Movement --------
  if (southRes > northRes + THRESHOLD) {
    if (swNorth == HIGH) {
      digitalWrite(m2b, HIGH);
      delay(50);
      digitalWrite(m2b, LOW);
      Serial.println("Moving South to North");
    }
  }

  // LED Heartbeat Indicator
  digitalWrite(led, !digitalRead(led));
  delay(200);
}

// ======================================================
// Read LDR Values
// ======================================================
void getLdrStatus() {

  eastRes  = analogRead(A3);
  westRes  = analogRead(A2);
  northRes = analogRead(A1);
  southRes = analogRead(A0);

  Serial.print("E:");
  Serial.print(eastRes);
  Serial.print(" W:");
  Serial.print(westRes);
  Serial.print(" N:");
  Serial.print(northRes);
  Serial.print(" S:");
  Serial.println(southRes);
}

// ======================================================
// Read Switch Status
// ======================================================
void getSwitchStatus() {

  swEast  = digitalRead(eastSw);
  swWest  = digitalRead(westSw);
  swNorth = digitalRead(northSw);
  swSouth = digitalRead(southSw);

  Serial.print("SwE:");
  Serial.print(swEast);
  Serial.print(" SwW:");
  Serial.print(swWest);
  Serial.print(" SwN:");
  Serial.print(swNorth);
  Serial.print(" SwS:");
  Serial.println(swSouth);

  Serial.println();
}

// ======================================================
// Stop Motors
// ======================================================
void stopMotors() {

  digitalWrite(m1a, LOW);
  digitalWrite(m1b, LOW);
  digitalWrite(m2a, LOW);
  digitalWrite(m2b, LOW);
}