import unittest

from datetime import datetime, timedelta

import jwt

from Crypto.PublicKey import RSA
from cryptography.hazmat.backends import default_backend
from cryptography.hazmat.primitives.serialization import load_der_public_key

from util.config.provider.license import (decode_license, LICENSE_PRODUCT_NAME,
                                          LicenseValidationError)


class TestLicense(unittest.TestCase):
  def keys(self):
    with open('test/data/test.pem') as f:
      private_key = f.read()

    public_key = load_der_public_key(RSA.importKey(private_key).publickey().exportKey('DER'),
                                     backend=default_backend())
    return (public_key, private_key)

  def create_license(self, license_data):
    (public_key, private_key) = self.keys()

    # Encode the license with the JWT key.
    encoded = jwt.encode(license_data, private_key, algorithm='RS256')

    # Decode it into a license object.
    return decode_license(encoded, public_key_instance=public_key)

  def get_license(self, expiration_delta=None, **kwargs):
    license_data = {
      'expirationDate': str(datetime.now() + expiration_delta),
    }

    if kwargs:
      sub = {
        'productName': LICENSE_PRODUCT_NAME,
      }

      sub['trialOnly'] = kwargs.get('trial_only', False)
      sub['inTrial'] = kwargs.get('in_trial', False)
      sub['entitlements'] = kwargs.get('entitlements', [])

      if 'trial_end' in kwargs:
        sub['trialEnd'] = str(datetime.now() + kwargs['trial_end'])

      if 'service_end' in kwargs:
        sub['serviceEnd'] = str(datetime.now() + kwargs['service_end'])

      if 'duration' in kwargs:
        sub['durationPeriod'] = kwargs['duration']

      license_data['subscriptions'] = [sub]

    decoded_license = self.create_license(license_data)
    return decoded_license

  def test_license_itself_expired(self):
    # License is expired.
    license = self.get_license(timedelta(days=-30))

  def test_no_qe_subscription(self):
    # License is not expired, but there is no QE sub, so not valid.
    license = self.get_license(timedelta(days=30))

  def test_trial_withingrace(self):
    license = self.get_license(timedelta(days=30), trial_only=True, trial_end=timedelta(days=-1))
    self.assertFalse(license.is_expired)

  def test_trial_outsidegrace(self):
    license = self.get_license(timedelta(days=30), trial_only=True, trial_end=timedelta(days=-10))
    self.assertTrue(license.is_expired)

  def test_trial_intrial_withingrace(self):
    license = self.get_license(timedelta(days=30), in_trial=True, service_end=timedelta(days=-1))
    self.assertFalse(license.is_expired)

  def test_trial_intrial_outsidegrace(self):
    license = self.get_license(timedelta(days=30), in_trial=True, service_end=timedelta(days=-10))
    self.assertTrue(license.is_expired)

  def test_monthly_license_valid(self):
    license = self.get_license(timedelta(days=30), service_end=timedelta(days=10), duration='monthly')
    self.assertFalse(license.is_expired)

  def test_monthly_license_withingrace(self):
    license = self.get_license(timedelta(days=30), service_end=timedelta(days=-10), duration='monthly')
    self.assertFalse(license.is_expired)

  def test_monthly_license_outsidegrace(self):
    license = self.get_license(timedelta(days=30), service_end=timedelta(days=-40), duration='monthly')
    self.assertTrue(license.is_expired)

  def test_yearly_license_withingrace(self):
    license = self.get_license(timedelta(days=30), service_end=timedelta(days=-40), duration='years')
    self.assertFalse(license.is_expired)

  def test_yearly_license_outsidegrace(self):
    license = self.get_license(timedelta(days=30), service_end=timedelta(days=-100), duration='years')
    self.assertTrue(license.is_expired)

  def test_valid_license(self):
    license = self.get_license(timedelta(days=300), service_end=timedelta(days=40), duration='years')
    self.assertFalse(license.is_expired)

  def test_validate_basic_license(self):
    decoded = self.get_license(timedelta(days=30), entitlements={})
    decoded.validate({'DISTRIBUTED_STORAGE_CONFIG': [{}]})

  def test_validate_storage_entitlement_valid(self):
    decoded = self.get_license(timedelta(days=30), entitlements={
      'software.quay.regions': 2,
    })

    decoded.validate({'DISTRIBUTED_STORAGE_CONFIG': [{}]})

  def test_validate_storage_entitlement_invalid(self):
    decoded = self.get_license(timedelta(days=30), entitlements={
      'software.quay.regions': 1,
    })

    with self.assertRaises(LicenseValidationError):
      decoded.validate({'DISTRIBUTED_STORAGE_CONFIG': [{}, {}]})


if __name__ == '__main__':
  unittest.main()