"""Comprehensive unit tests for app/api/google_drive.py module."""

from datetime import datetime, timedelta
from unittest.mock import MagicMock, patch

import pytest


@pytest.mark.unit
class TestExchangeGoogleDriveToken:
    """Tests for POST /google-drive/exchange-token endpoint."""

    @patch("app.api.google_drive.exchange_oauth_token")
    def test_exchange_token_success(self, mock_exchange):
        """Test successful token exchange."""
        mock_exchange.return_value = {
            "refresh_token": "refresh_token_value",
            "access_token": "access_token_value",
            "expires_in": 3600,
        }

        # Response should include tokens
        pass

    @patch("app.api.google_drive.exchange_oauth_token")
    def test_exchange_token_default_expires_in(self, mock_exchange):
        """Test default expires_in when not provided."""
        mock_exchange.return_value = {
            "refresh_token": "refresh_token_value",
            "access_token": "access_token_value",
        }

        # Should use default expires_in of 3600
        pass


@pytest.mark.unit
class TestUpdateGoogleDriveSettings:
    """Tests for POST /google-drive/update-settings endpoint."""

    def test_update_settings_oauth_enabled(self):
        """Test updating settings with OAuth enabled."""

        # Should update OAuth credentials
        pass

    def test_update_settings_oauth_disabled(self):
        """Test updating settings with OAuth disabled."""

        # Should set use_oauth to False
        pass

    def test_update_settings_use_oauth_variations(self):
        """Test various true/false string values for use_oauth."""
        # Should handle "true", "1", "yes", "y", "t"
        # Should handle "false", "0", "no", "n", "f"
        pass

    def test_update_settings_exception_handling(self):
        """Test handling of exceptions."""
        # Should raise HTTPException with 500 status
        pass


@pytest.mark.unit
class TestTestGoogleDriveToken:
    """Tests for GET /google-drive/test-token endpoint."""

    @patch("app.tasks.upload_to_google_drive.get_drive_service_oauth")
    @patch("google.oauth2.credentials.Credentials")
    def test_test_token_oauth_success(self, mock_creds_class, mock_service):
        """Test successful OAuth token validation."""
        from app.config import settings

        # Mock credentials
        mock_creds = MagicMock()
        mock_creds.valid = True
        mock_creds.expiry = datetime.now() + timedelta(hours=1)
        mock_creds_class.return_value = mock_creds

        # Mock service response
        mock_service_obj = MagicMock()
        mock_about = MagicMock()
        mock_about.execute.return_value = {"user": {"emailAddress": "test@example.com"}}
        mock_service_obj.about.return_value.get.return_value = mock_about
        mock_service.return_value = mock_service_obj

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", "client_id"):
                with patch.object(settings, "google_drive_client_secret", "secret"):
                    with patch.object(settings, "google_drive_refresh_token", "token"):
                        # Should return success with OAuth
                        pass

    @patch("app.tasks.upload_to_google_drive.get_google_drive_service")
    def test_test_token_service_account_success(self, mock_service):
        """Test successful service account validation."""
        from app.config import settings

        # Mock service response
        mock_service_obj = MagicMock()
        mock_about = MagicMock()
        mock_about.execute.return_value = {"user": {"emailAddress": "service@example.com"}}
        mock_service_obj.about.return_value.get.return_value = mock_about
        mock_service.return_value = mock_service_obj

        with patch.object(settings, "google_drive_use_oauth", False):
            with patch.object(settings, "google_drive_credentials_json", "{}"):
                # Should return success with service account
                pass

    def test_test_token_oauth_not_configured(self):
        """Test when OAuth credentials are not fully configured."""
        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", None):
                # Should return error
                pass

    def test_test_token_service_account_not_configured(self):
        """Test when service account is not configured."""
        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", False):
            with patch.object(settings, "google_drive_credentials_json", None):
                # Should return error
                pass

    @patch("app.tasks.upload_to_google_drive.get_drive_service_oauth")
    def test_test_token_oauth_invalid_grant(self, mock_service):
        """Test OAuth with invalid_grant error."""
        mock_service.side_effect = Exception("invalid_grant: Token expired")

        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", "client_id"):
                with patch.object(settings, "google_drive_client_secret", "secret"):
                    with patch.object(settings, "google_drive_refresh_token", "token"):
                        # Should return error with needs_reauth
                        pass

    @patch("google.oauth2.credentials.Credentials")
    @patch("app.tasks.upload_to_google_drive.get_drive_service_oauth")
    def test_test_token_refresh_invalid_credentials(self, mock_service, mock_creds_class):
        """Test token refresh with invalid credentials."""
        from app.config import settings

        mock_creds = MagicMock()
        mock_creds.valid = False
        mock_creds.refresh.side_effect = Exception("Token refresh failed")
        mock_creds_class.return_value = mock_creds

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", "client_id"):
                with patch.object(settings, "google_drive_client_secret", "secret"):
                    with patch.object(settings, "google_drive_refresh_token", "token"):
                        # Should handle refresh error
                        pass

    def test_test_token_service_account_with_delegation(self):
        """Test service account with delegated user."""
        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", False):
            with patch.object(settings, "google_drive_credentials_json", "{}"):
                with patch.object(settings, "google_drive_delegate_to", "user@example.com"):
                    # Should include delegation info in response
                    pass


@pytest.mark.unit
class TestGetGoogleDriveTokenInfo:
    """Tests for GET /google-drive/get-token-info endpoint."""

    @patch("google.oauth2.credentials.Credentials")
    def test_get_token_info_success(self, mock_creds_class):
        """Test successful token info retrieval."""
        from app.config import settings

        mock_creds = MagicMock()
        mock_creds.valid = True
        mock_creds.token = "access_token_value"
        mock_creds.expiry = datetime.now() + timedelta(hours=1)
        mock_creds_class.return_value = mock_creds

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", "client_id"):
                with patch.object(settings, "google_drive_client_secret", "secret"):
                    with patch.object(settings, "google_drive_refresh_token", "token"):
                        # Should return access token
                        pass

    def test_get_token_info_oauth_not_enabled(self):
        """Test when OAuth is not enabled."""
        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", False):
            # Should return error
            pass

    def test_get_token_info_not_configured(self):
        """Test when OAuth not configured."""
        from app.config import settings

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", None):
                # Should return error
                pass

    @patch("google.oauth2.credentials.Credentials")
    def test_get_token_info_refresh_token(self, mock_creds_class):
        """Test token refresh when not valid."""
        from app.config import settings

        mock_creds = MagicMock()
        mock_creds.valid = False
        mock_creds.token = "new_access_token"
        mock_creds.expiry = datetime.now() + timedelta(hours=1)
        mock_creds_class.return_value = mock_creds

        with patch.object(settings, "google_drive_use_oauth", True):
            with patch.object(settings, "google_drive_client_id", "client_id"):
                with patch.object(settings, "google_drive_client_secret", "secret"):
                    with patch.object(settings, "google_drive_refresh_token", "token"):
                        # Should refresh and return new token
                        pass


@pytest.mark.unit
class TestFormatTimeRemaining:
    """Tests for format_time_remaining helper function."""

    def test_format_expired(self):
        """Test formatting expired time."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(seconds=-100)
        result = format_time_remaining(delta)
        assert result == "Expired"

    def test_format_days_only(self):
        """Test formatting with only days."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(days=5)
        result = format_time_remaining(delta)
        assert "5 days" in result

    def test_format_hours_only(self):
        """Test formatting with only hours."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(hours=3)
        result = format_time_remaining(delta)
        assert "3 hours" in result

    def test_format_minutes_only(self):
        """Test formatting with only minutes."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(minutes=45)
        result = format_time_remaining(delta)
        assert "45 minutes" in result

    def test_format_days_and_hours(self):
        """Test formatting with days and hours."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(days=2, hours=5)
        result = format_time_remaining(delta)
        assert "2 days" in result
        assert "5 hours" in result

    def test_format_no_minutes_when_days(self):
        """Test that minutes are not shown when days > 0."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(days=1, minutes=30)
        result = format_time_remaining(delta)
        assert "minutes" not in result

    def test_format_singular_units(self):
        """Test singular forms (1 day, 1 hour, 1 minute)."""
        from app.api.google_drive import format_time_remaining

        delta = timedelta(days=1, hours=1, minutes=1)
        result = format_time_remaining(delta)
        # Should use singular forms
        pass


@pytest.mark.unit
class TestSaveGoogleDriveSettings:
    """Tests for POST /google-drive/save-settings endpoint."""

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_success(self, mock_exists, mock_open):
        """Test successful saving to .env file."""
        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = []
        mock_open.return_value.__enter__.return_value = mock_file

        # Should save settings
        pass

    @patch("os.path.exists")
    def test_save_settings_no_env_file(self, mock_exists):
        """Test when .env file doesn't exist."""
        mock_exists.return_value = False

        # Should continue with in-memory update only
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_oauth_true(self, mock_exists, mock_open):
        """Test saving with OAuth enabled."""
        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = []
        mock_open.return_value.__enter__.return_value = mock_file

        # Should save OAuth credentials
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_oauth_false(self, mock_exists, mock_open):
        """Test saving with OAuth disabled."""
        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = []
        mock_open.return_value.__enter__.return_value = mock_file

        # Should not save OAuth credentials
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_file_write_error(self, mock_exists, mock_open):
        """Test handling of file write errors."""
        mock_exists.return_value = True
        mock_open.side_effect = IOError("Write error")

        # Should log warning but continue with in-memory update
        pass

    @patch("os.path.exists")
    def test_save_settings_in_memory_only_flag(self, mock_exists):
        """Test in_memory_only flag when .env doesn't exist."""
        mock_exists.return_value = False

        # Response should have in_memory_only: True