import json
import unittest
from unittest.mock import MagicMock

from services.gateway_session_store import GatewaySessionStore
from utils.security import hash_gateway_session_id


class TestGatewaySessionStore(unittest.TestCase):
    def setUp(self):
        self.mock_redis = MagicMock()
        self.store = GatewaySessionStore(
            self.mock_redis,
            prefix='fms:mcp:gateway:',
            ttl_seconds=3600
        )

    def test_key_for_generates_correct_key(self):
        session_id = 'GWS_abc123'
        expected_hash = hash_gateway_session_id(session_id)
        expected_key = f'fms:mcp:gateway:session:{expected_hash}'

        key = self.store.key_for(session_id)
        self.assertEqual(key, expected_key)

    def test_save_stores_session_with_hash(self):
        session_id = 'GWS_test123'
        session_data = {
            'mcp_token': 'MT_xyz',
            'admin_id': 123,
            'company_id': 100,
        }

        result = self.store.save(session_id, session_data)

        # Should add gateway_session_id_hash
        self.assertIn('gateway_session_id_hash', result)
        self.assertEqual(result['gateway_session_id_hash'], hash_gateway_session_id(session_id))

        # Should call Redis set with correct parameters
        self.mock_redis.set.assert_called_once()
        call_args = self.mock_redis.set.call_args
        key_arg = call_args[0][0]
        value_arg = call_args[0][1]
        ttl_arg = call_args[1]['ex']

        self.assertEqual(key_arg, self.store.key_for(session_id))
        self.assertEqual(ttl_arg, 3600)

        # Verify JSON contains expected fields
        saved_data = json.loads(value_arg)
        self.assertEqual(saved_data['mcp_token'], 'MT_xyz')
        self.assertEqual(saved_data['admin_id'], 123)
        self.assertEqual(saved_data['company_id'], 100)
        self.assertIn('gateway_session_id_hash', saved_data)

    def test_get_returns_session(self):
        session_id = 'GWS_test456'
        session_data = {
            'mcp_token': 'MT_abc',
            'admin_id': 456,
            'company_id': 200,
            'gateway_session_id_hash': hash_gateway_session_id(session_id),
        }

        self.mock_redis.get.return_value = json.dumps(session_data)

        result = self.store.get(session_id)

        self.assertEqual(result['mcp_token'], 'MT_abc')
        self.assertEqual(result['admin_id'], 456)
        self.assertEqual(result['company_id'], 200)
        self.mock_redis.get.assert_called_once_with(self.store.key_for(session_id))

    def test_get_returns_none_when_not_found(self):
        self.mock_redis.get.return_value = None

        result = self.store.get('GWS_nonexistent')

        self.assertIsNone(result)

    def test_get_handles_bytes(self):
        session_id = 'GWS_bytes_test'
        session_data = {'mcp_token': 'MT_test'}
        self.mock_redis.get.return_value = json.dumps(session_data).encode('utf-8')

        result = self.store.get(session_id)

        self.assertEqual(result['mcp_token'], 'MT_test')

    def test_delete_removes_session(self):
        session_id = 'GWS_delete_test'
        self.mock_redis.delete.return_value = 1

        result = self.store.delete(session_id)

        self.assertEqual(result, 1)
        self.mock_redis.delete.assert_called_once_with(self.store.key_for(session_id))

    def test_different_session_ids_have_different_keys(self):
        session_1 = 'GWS_session_1'
        session_2 = 'GWS_session_2'

        key_1 = self.store.key_for(session_1)
        key_2 = self.store.key_for(session_2)

        self.assertNotEqual(key_1, key_2)

    def test_prefix_is_applied_correctly(self):
        store_with_prefix = GatewaySessionStore(
            self.mock_redis,
            prefix='custom:prefix:',
            ttl_seconds=1800
        )

        session_id = 'GWS_test'
        key = store_with_prefix.key_for(session_id)

        self.assertTrue(key.startswith('custom:prefix:session:'))


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