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import tempfile, os, requests, json, webbrowser
import pyscreenshot as pyscr
from base64 import b64encode

# required modules: pyscreenshot, PIL, requests

__client_id__ = '...'
__client_secret__ = '...'
__cred_keys__ = ['access_token', 'refresh_token', 'token_type', 'expires_in']

def valid_credentials(creds):
	for k in __cred_keys__:
		if k not in creds:
			return False
	return True

def refresh(creds):
	params = {
		'client_id': __client_id__,
		'client_secret': __client_secret__,
		'grant_type': 'refresh_token',
		'refresh_token': creds['refresh_token']
	}
	
	r = requests.post('https://api.imgur.com/oauth2/token', verify = False, data = params)
	
	return r.json()

def authorize():
	cred_file = os.path.expanduser(os.path.join('~', '.imgur_credentials'))
	
	if os.path.exists(cred_file):
		with file(cred_file) as f:
			creds = json.loads(f.read())
		
		if valid_credentials(creds):
			return refresh(creds)
	
	auth_url = 'https://api.imgur.com/oauth2/authorize?client_id=%s&response_type=%s' % (__client_id__, 'pin')
	
	webbrowser.open_new_tab(auth_url)
	
	print 'Enter PIN:',
	pin = raw_input()
	
	params = {
		'client_id': __client_id__,
		'client_secret': __client_secret__,
		'grant_type': 'pin',
		'pin': pin
	}
	
	r = requests.post('https://api.imgur.com/oauth2/token', verify = False, data = params)
	
	creds = r.json()
	
	with file(cred_file, 'w') as f:
		f.write(r.text)
	
	return creds

def capture_upload():
	creds = authorize()
	
	_, filepath = tempfile.mkstemp(suffix = '.jpg')
	
	pyscr.grab_to_file(filepath)
	
	with file(filepath, 'rb') as f:
		image = b64encode(f.read())
	
	params = {
		'image': image
	}
	
	headers = {
		'Authorization': 'Bearer %s' % creds['access_token']
	}
	
	r = requests.post('https://api.imgur.com/3/image', verify = False, data = params, headers = headers)
	
	res = r.json()
	
	if r.status_code == 200:
		pass
	else:
		print res['data']['error']
		exit(1)
	
	webbrowser.open_new_tab(res['data']['link'])
	
	#os.unlink(filepath)

if __name__ == '__main__':
	capture_upload()