import RPi.GPIO as GPIO
import time
import threading

class GPIOControl:
    def __init__(self, camera):
        GPIO.setmode(GPIO.BCM)
        self.camera = camera

        #Verzögerung im Ein- und Ausschalten der Beleuchtung
        self.lighting_delay = 100 / 1000

        # Pin-Definitionen
        self.lighting_trigger_gpio = 17     #Schalter für Beleuchtung Ein/Aus
        self.camera_trigger_gpio = 27       #Schalter für Kamera auslösen
        self.lighting_output_gpio = 23      #Ausgang für Beleuchtung

        self.activate_flash = False
        self.permanent_lighting = False

        # Pin-Setup
        GPIO.setup(self.lighting_trigger_gpio, GPIO.IN, pull_up_down=GPIO.PUD_UP)
        GPIO.setup(self.camera_trigger_gpio, GPIO.IN, pull_up_down=GPIO.PUD_UP)
        GPIO.setup(self.lighting_output_gpio, GPIO.OUT, initial=GPIO.LOW)

        self.camera_trigger_time = None
        self.running = True  

    def start(self):
        # Startet die Überwachung in einem separaten Thread, ist wegen der blockierenden Ausführung der Benutzeroberfläche erforderlich
        self.thread = threading.Thread(target=self.monitor_gpio)
        self.thread.start()

    def stop(self):
        self.running = False
        self.thread.join()

    #Blitz / Dauerbeleuchtung an/aus wird durch GUI eingestellt
    def get_gui_settings(self, activate_flash, permanent_lighting):
        self.activate_flash = activate_flash
        self.permanent_lighting = permanent_lighting

        self.activate_lighting()
        self.deactivate_lighting()



    def activate_lighting(self):
        if self.activate_flash == True or self.permanent_lighting == True:
            GPIO.output(self.lighting_output_gpio, GPIO.HIGH)

    def deactivate_lighting(self):
        if self.permanent_lighting == False: 
            GPIO.output(self.lighting_output_gpio, GPIO.LOW)

    def monitor_gpio(self):
        try:
            while self.running:
                if GPIO.input(self.lighting_trigger_gpio) == GPIO.LOW:
                    self.activate_lighting()

                if GPIO.input(self.camera_trigger_gpio) == GPIO.LOW:
                    self.activate_lighting()
                    time.sleep(self.lighting_delay)
                    self.camera.get_still_image()
                    time.sleep(self.lighting_delay)
                    self.deactivate_lighting()

                else:
                    if GPIO.input(self.camera_trigger_gpio) == GPIO.HIGH and GPIO.input(self.lighting_trigger_gpio) == GPIO.HIGH:
                        self.deactivate_lighting()
                time.sleep(0.1) 
        finally:
            GPIO.cleanup()