#include <stdio.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "driver/gpio.h"
#include "esp_timer.h"

#define DHT_GPIO 4 

// Fungsi pembantu untuk menunggu perubahan level pin
static int wait_level(int level, uint32_t timeout_us) {
    uint32_t start = esp_timer_get_time();
    while (gpio_get_level(DHT_GPIO) != level) {
        if (esp_timer_get_time() - start > timeout_us) return -1;
    }
    return esp_timer_get_time() - start;
}

void detect_and_read_dht() {
    uint8_t data[5] = {0,0,0,0,0};
    
    // --- 1. Sinyal Start ---
    gpio_set_direction(DHT_GPIO, GPIO_MODE_OUTPUT);
    gpio_set_level(DHT_GPIO, 0);
    vTaskDelay(pdMS_TO_TICKS(20)); 
    gpio_set_level(DHT_GPIO, 1);
    esp_rom_delay_us(30);
    gpio_set_direction(DHT_GPIO, GPIO_MODE_INPUT);

    // --- 2. Respon Sensor ---
    if (wait_level(0, 100) < 0 || wait_level(1, 100) < 0 || wait_level(0, 100) < 0) {
        printf("[ERROR] Sensor tidak merespon!\n");
        return;
    }

    // --- 3. Baca 40 Bit Data ---
    for (int i = 0; i < 40; i++) {
        if (wait_level(1, 100) < 0) return;
        uint32_t duration = wait_level(0, 100);
        if (duration > 40) {
            data[i / 8] |= (1 << (7 - (i % 8)));
        }
    }

    // --- 4. Cek Checksum ---
    if (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) {
        float temp, hum;
        const char* sensor_type;

        /* LOGIKA DETEKSI:
           DHT11: Mengirim nilai desimal (byte 1 & 3) yang biasanya 0.
           DHT22: Mengirim nilai 16-bit utuh.
           
           SIMULASI: Kita bisa memaksa logika mendeteksi DHT11 jika nilai 
           byte 1 dan 3 sangat kecil (khas simulasi Wokwi untuk DHT11).
        */
        
        if (data[1] == 0 && data[3] == 0) {
            // TERDETEKSI SEBAGAI DHT11
            sensor_type = "DHT11 (Blue)";
            hum = (float)data[0];
            temp = (float)data[2];
        } else {
            // TERDETEKSI SEBAGAI DHT22
            sensor_type = "DHT22 (White)";
            hum = ((data[0] << 8) | data[1]) / 10.0;
            temp = (((data[2] & 0x7F) << 8) | data[3]) / 10.0;
            if (data[2] & 0x80) temp *= -1;
        }

        printf("------------------------------------------\n");
        printf("SENSOR TYPE : %s\n", sensor_type);
        printf("DATA RAW    : [%02X %02X %02X %02X %02X]\n", data[0], data[1], data[2], data[3], data[4]);
        printf("RESULT      : %.1f°C | %.1f%%\n", temp, hum);
        printf("------------------------------------------\n");

    } else {
        printf("[CHECKSUM ERROR] Data rusak!\n");
    }
}

void app_main(void) {
    vTaskDelay(pdMS_TO_TICKS(1000));
    while(1) {
        detect_and_read_dht();
        vTaskDelay(pdMS_TO_TICKS(3000)); // Delay lebih lama agar stabil
    }
}