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

from unittest.mock import MagicMock, patch

import pytest


@pytest.mark.unit
class TestExchangeDropboxToken:
    """Tests for POST /dropbox/exchange-token endpoint."""

    @patch("app.api.dropbox.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": 14400,
        }

        # Response should include refresh_token, access_token, expires_in
        pass

    @patch("app.api.dropbox.exchange_oauth_token")
    def test_exchange_token_without_expires_in(self, mock_exchange):
        """Test token exchange without expires_in field."""
        mock_exchange.return_value = {
            "refresh_token": "refresh_token_value",
            "access_token": "access_token_value",
        }

        # Should use default expires_in of 14400
        pass

    @patch("app.api.dropbox.exchange_oauth_token")
    def test_exchange_token_calls_oauth_helper(self, mock_exchange):
        """Test that exchange_oauth_token is called correctly."""
        mock_exchange.return_value = {
            "refresh_token": "token",
            "access_token": "access",
            "expires_in": 3600,
        }

        # Should call with provider_name="Dropbox"
        # Should call with correct token_url
        # Should pass payload with all form data
        pass


@pytest.mark.unit
class TestUpdateDropboxSettings:
    """Tests for POST /dropbox/update-settings endpoint."""

    def test_update_settings_refresh_token(self):
        """Test updating only refresh token."""

        # Should update settings.dropbox_refresh_token
        pass

    def test_update_settings_all_fields(self):
        """Test updating all Dropbox settings."""

        # Should update all fields: refresh_token, app_key, app_secret, folder_path
        pass

    def test_update_settings_partial_fields(self):
        """Test updating some fields (not all)."""

        # Should only update provided fields
        pass

    def test_update_settings_logs_updates(self):
        """Test that updates are logged."""
        # Should log each updated field
        pass

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


@pytest.mark.unit
class TestTestDropboxToken:
    """Tests for GET /dropbox/test-token endpoint."""

    @patch("app.api.dropbox.requests.post")
    def test_test_token_success(self, mock_post):
        """Test successful token validation."""
        from app.config import settings

        mock_response = MagicMock()
        mock_response.status_code = 200
        mock_response.json.return_value = {
            "email": "test@example.com",
            "name": {"display_name": "Test User"},
        }
        mock_post.return_value = mock_response

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", "key"):
                with patch.object(settings, "dropbox_app_secret", "secret"):
                    # Should return success
                    # Should include account email and name
                    pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_not_configured(self, mock_post):
        """Test when credentials are not configured."""
        from app.config import settings

        with patch.object(settings, "dropbox_refresh_token", None):
            # Should return error indicating not configured
            pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_partial_config(self, mock_post):
        """Test with partial configuration (missing some credentials)."""
        from app.config import settings

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", None):
                # Should return error
                pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_expired_requires_refresh(self, mock_post):
        """Test when access token is expired and needs refresh."""
        from app.config import settings

        # First call returns 401 (expired)
        mock_response_401 = MagicMock()
        mock_response_401.status_code = 401

        # Second call (refresh) returns success
        mock_refresh_response = MagicMock()
        mock_refresh_response.status_code = 200
        mock_refresh_response.json.return_value = {"access_token": "new_token"}

        # Third call with new token succeeds
        mock_success_response = MagicMock()
        mock_success_response.status_code = 200
        mock_success_response.json.return_value = {
            "email": "test@example.com",
            "name": {"display_name": "Test User"},
        }

        mock_post.side_effect = [mock_response_401, mock_refresh_response, mock_success_response]

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", "key"):
                with patch.object(settings, "dropbox_app_secret", "secret"):
                    # Should refresh and succeed
                    pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_refresh_failed(self, mock_post):
        """Test when refresh token is invalid."""
        from app.config import settings

        # First call returns 401 (expired)
        mock_response_401 = MagicMock()
        mock_response_401.status_code = 401

        # Refresh call fails
        mock_refresh_response = MagicMock()
        mock_refresh_response.status_code = 400
        mock_refresh_response.text = "Invalid refresh token"

        mock_post.side_effect = [mock_response_401, mock_refresh_response]

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", "key"):
                with patch.object(settings, "dropbox_app_secret", "secret"):
                    # Should return error with needs_reauth: True
                    pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_perpetual_token_info(self, mock_post):
        """Test that perpetual token info is returned."""
        from app.config import settings

        mock_response = MagicMock()
        mock_response.status_code = 200
        mock_response.json.return_value = {
            "email": "test@example.com",
            "name": {"display_name": "Test User"},
        }
        mock_post.return_value = mock_response

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", "key"):
                with patch.object(settings, "dropbox_app_secret", "secret"):
                    # token_info should indicate never expires
                    pass

    @patch("app.api.dropbox.requests.post")
    def test_test_token_exception_handling(self, mock_post):
        """Test handling of exceptions."""
        from app.config import settings

        mock_post.side_effect = Exception("Network error")

        with patch.object(settings, "dropbox_refresh_token", "token"):
            with patch.object(settings, "dropbox_app_key", "key"):
                with patch.object(settings, "dropbox_app_secret", "secret"):
                    # Should return error with exception message
                    pass


@pytest.mark.unit
class TestSaveDropboxSettings:
    """Tests for POST /dropbox/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 = ["DROPBOX_REFRESH_TOKEN=old_token\n"]
        mock_open.return_value.__enter__.return_value = mock_file

        # Should update .env file and in-memory 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 raise HTTPException
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_uncomments_commented_line(self, mock_exists, mock_open):
        """Test that commented settings are uncommented."""
        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = ["# DROPBOX_REFRESH_TOKEN=old_token\n"]
        mock_open.return_value.__enter__.return_value = mock_file

        # Should uncomment the line
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_adds_missing_settings(self, mock_exists, mock_open):
        """Test that missing settings are added."""
        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = ["OTHER_SETTING=value\n"]
        mock_open.return_value.__enter__.return_value = mock_file

        # Should append new settings
        pass

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

        # Should save all provided fields
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_updates_memory(self, mock_exists, mock_open):
        """Test that in-memory settings are updated."""

        mock_exists.return_value = True
        mock_file = MagicMock()
        mock_file.readlines.return_value = []
        mock_open.return_value.__enter__.return_value = mock_file

        # Should update settings object
        pass

    @patch("builtins.open", create=True)
    @patch("os.path.exists")
    def test_save_settings_exception_handling(self, mock_exists, mock_open):
        """Test handling of file I/O errors."""
        mock_exists.return_value = True
        mock_open.side_effect = IOError("Permission denied")

        # Should raise HTTPException with 500 status