from picamera import PiCamera
from ftplib import FTP
import os
import time
import datetime

camera = PiCamera()

# Depends on how your camera is set up...my Pi is turned sideways
camera.rotation = 270
camera.hflip = True

# Load FTP server credentials
try:
    upload_ftp = os.getenv('CAMERA_FTP_SITE')
    upload_user = os.getenv('CAMERA_FTP_USER')
    upload_password = os.getenv('CAMERA_FTP_PASSWORD')
except:
    raise Exception('Environmental variables with FTP info cannot be loaded')

ftp = FTP(upload_ftp, upload_user, upload_password)

# And run forever
while True:
    t = datetime.datetime.utcnow().hour
    # Save bandwidth by not uploading during very night times
    if ((t - 7) > 5) or ((t - 7) < 1):
        camera.capture('/tmp/cam.jpg')
        try:
            f = open('/tmp/cam.jpg', 'r')

            # First we upload the image to a temporary name, then rename it on the server.
            # This prevents someone loading the image online as corrupted during upload.
            ftp.storbinary('STOR new-cam-temp.jpg', f)
            ftp.rename('new-cam-temp.jpg', 'new-cam.jpg')

        except Exception, e:
            print('Exception: %s' % (e,))
            try:
                ftp.close()
                ftp = FTP(upload_ftp, upload_user, upload_password)
            except Exception, f:
                print('Error, %s and %s' % (e, f))
        time.sleep(5)
    else:
        print('Not uploading during night time.')
        time.sleep(60)