#include <stdio.h>
#include "pico/stdlib.h"
#include "hardware/gpio.h"

#define DHT_PIN 26
#define LED_PIN 25
#define FAN_PIN 15   // simulate fan with green LED
#define AC_PIN 14    // simulate AC with red LED

// Simulated temperature reading
float read_temperature() {
    static float temp = 25.0f;
    temp += 1.0f;
    if (temp > 40.0f) temp = 25.0f;
    return temp;
}

int main() {
    stdio_init_all();

    // Initialize pins
    gpio_init(LED_PIN);  gpio_set_dir(LED_PIN, true);
    gpio_init(FAN_PIN);  gpio_set_dir(FAN_PIN, true);
    gpio_init(AC_PIN);   gpio_set_dir(AC_PIN, true);

    while (1) {
        float temperature = read_temperature();
        printf("Temperature: %.2f C\n", temperature);

        // Blink system LED
        gpio_put(LED_PIN, 1);
        sleep_ms(200);
        gpio_put(LED_PIN, 0);

        // Mutually exclusive control
        if (temperature < 28.0f) {
            // Low temp → AC ON, Fan OFF
            gpio_put(AC_PIN, 1);
            gpio_put(FAN_PIN, 0);
        } else {
            // High temp → Fan ON, AC OFF
            gpio_put(AC_PIN, 0);
            gpio_put(FAN_PIN, 1);
        }

        sleep_ms(2000);
    }
}