'''
  ____    _    ____      _
 / ___|  / \  |  _ \    / \
 \___ \ / _ \ | |_) |  / _ \
  ___) / ___ \|  _ <  / ___ \
 |____/_/   \_\_| \_\/_/   \_\

sudo /usr/bin/python3 /var/www/nebuleair_pro_4g/SARA/reboot/hardware_reboot.py

Hardware reboot of the SARA R5 modem using GPIO 16 (GND control via transistor).
Cuts power for 3 seconds, then verifies modem is responsive with ATI command.
Returns JSON result for web interface.
'''

import RPi.GPIO as GPIO
import serial
import time
import json
import sqlite3

SARA_GND_GPIO = 16

# Load baudrate from config
conn = sqlite3.connect("/var/www/nebuleair_pro_4g/sqlite/sensors.db")
cursor = conn.cursor()
cursor.execute("SELECT value FROM config_table WHERE key='SaraR4_baudrate'")
row = cursor.fetchone()
baudrate = int(row[0]) if row else 115200
conn.close()

result = {
    "reboot": False,
    "modem_response": None,
    "error": None
}

try:
    # Step 1: Cut GND (modem off)
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(SARA_GND_GPIO, GPIO.OUT)
    GPIO.output(SARA_GND_GPIO, GPIO.LOW)
    time.sleep(3)

    # Step 2: Restore GND (modem on)
    GPIO.output(SARA_GND_GPIO, GPIO.HIGH)
    time.sleep(5)  # wait for modem boot

    # Step 3: Check modem with ATI
    ser = serial.Serial('/dev/ttyAMA2', baudrate=baudrate, timeout=3)
    ser.reset_input_buffer()

    for attempt in range(5):
        ser.write(b'ATI\r')
        time.sleep(1)
        response = ser.read(ser.in_waiting or 1).decode('utf-8', errors='replace')
        if "OK" in response:
            result["reboot"] = True
            result["modem_response"] = response.strip()
            break
        time.sleep(2)
    else:
        result["error"] = "Modem ne repond pas apres le redemarrage"

    ser.close()

except Exception as e:
    result["error"] = str(e)

finally:
    GPIO.cleanup(SARA_GND_GPIO)

print(json.dumps(result))