from time import sleep
from picamera import PiCamera
import datetime
import os


def log(inner_fucntion):
    def wrapper(*args, **kwargs):
        print('Entering {} with arguments {}, {}'.format(inner_fucntion.__name__, *args, **kwargs))
        res = inner_fucntion(*args, **kwargs)
        print('Result is {}'.format(res))
        return res
    return wrapper

@log
def adjust_iso_value(iso, exposureTime):
    min_shutterspeed = 10000 # 1/100 secs
    if exposureTime >= min_shutterspeed:
        res_iso = iso*2
    elif exposureTime <= (min_shutterspeed/2):
        res_iso = iso/2
    else:
        res_iso = iso
    if res_iso < 100:
        res_iso = 100
    elif res_iso > 1600:
        res_iso = 1600
    return int(res_iso)


if __name__ == "__main__":
    camera = PiCamera()
    #camera.resolution = (1920, 1080)
    camera.resolution = (2592 ,1944) # Max for V1 cam
    camera.start_preview()
    camera.meter_mode = 'matrix'
    # Camera warm-up time
    sleep(2)

    i=1
    while i<10000:
        print('--> {}'.format(camera.exposure_speed))
        camera.iso = adjust_iso_value(camera.iso, camera.exposure_speed)
        camera.exposure_mode='sports'
        today=datetime.datetime.now()
        s=today.strftime("%Y-%m-%d")
        h=today.strftime("%H-%M")
        os.makedirs('/home/pi/repos/camera/{}'.format(s), exist_ok=True)
        camera.capture('/home/pi/repos/camera/{}/{}-{}-{}.jpg'.format(s,s,h, i))
        i=i+1
        sleep (2)