import os
import unittest
from pathlib import Path
from unittest.mock import mock_open, patch

from codeflash.code_utils.shell_utils import read_api_key_from_shell_config, save_api_key_to_rc
from codeflash.either import Failure, Success


class TestShellUtils(unittest.TestCase):
    @patch("codeflash.code_utils.shell_utils.open", new_callable=mock_open, read_data="existing content")
    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_save_api_key_to_rc_success(self, mock_get_shell_rc_path, mock_file):
        mock_get_shell_rc_path.return_value = "/fake/path/.bashrc"
        api_key = "cf-12345"
        result = save_api_key_to_rc(api_key)
        self.assertTrue(isinstance(result, Success))
        mock_file.assert_called_with("/fake/path/.bashrc", "r+", encoding="utf8")
        handle = mock_file()
        handle.write.assert_called_once()
        handle.truncate.assert_called_once()

    @patch("codeflash.code_utils.shell_utils.open", new_callable=mock_open, read_data="existing content")
    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_save_api_key_to_rc_failure(self, mock_get_shell_rc_path, mock_file):
        mock_get_shell_rc_path.return_value = "/fake/path/.bashrc"
        mock_file.side_effect = PermissionError
        api_key = "cf-12345"
        result = save_api_key_to_rc(api_key)
        self.assertTrue(isinstance(result, Failure))
        mock_file.assert_called_with("/fake/path/.bashrc", "r+", encoding="utf8")


# unit tests
class TestReadApiKeyFromShellConfig(unittest.TestCase):
    def setUp(self):
        """Setup a temporary shell configuration file for testing."""
        self.test_rc_path = "test_shell_rc"
        self.api_key = "cf-1234567890abcdef"
        os.environ["SHELL"] = "/bin/bash"  # Set a default shell for testing
        
        # Set up platform-specific export syntax
        if os.name == "nt":  # Windows
            self.api_key_export = f'set CODEFLASH_API_KEY={self.api_key}'
        else:  # Unix-like systems
            self.api_key_export = f'export CODEFLASH_API_KEY="{self.api_key}"'

    def tearDown(self):
        """Cleanup the temporary shell configuration file after testing."""
        test_rc_path = Path(self.test_rc_path)
        if test_rc_path.exists():
            test_rc_path.unlink()
        del os.environ["SHELL"]  # Remove the SHELL environment variable

    def test_valid_api_key(self):
        with patch("codeflash.code_utils.shell_utils.get_shell_rc_path") as mock_get_shell_rc_path:
            mock_get_shell_rc_path.return_value = self.test_rc_path
            with patch(
                "builtins.open", mock_open(read_data=f'{self.api_key_export}\n')
            ) as mock_file:
                self.assertEqual(read_api_key_from_shell_config(), self.api_key)
                mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")
                "builtins.open", mock_open(read_data=f'export CODEFLASH_API_KEY=\'{self.api_key}\'\n')
            
            if os.name != "nt":
                with patch(
                    "builtins.open", mock_open(read_data=f'export CODEFLASH_API_KEY=\'{self.api_key}\'\n')
                ) as mock_file:
                    self.assertEqual(read_api_key_from_shell_config(), self.api_key)
                    mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")
                
                with patch(
                    "builtins.open", mock_open(read_data=f'#export CODEFLASH_API_KEY=\'{self.api_key}\'\n')
                ) as mock_file:
                    self.assertEqual(read_api_key_from_shell_config(), None)
                    mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")
                
                with patch(
                    "builtins.open", mock_open(read_data=f'export CODEFLASH_API_KEY={self.api_key}\n')
                ) as mock_file:
                    self.assertEqual(read_api_key_from_shell_config(), self.api_key)
                    mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")
            
            elif os.name == "nt":
                with patch(
                    "builtins.open", mock_open(read_data=f'REM set CODEFLASH_API_KEY={self.api_key}\n')
                ) as mock_file:
                    self.assertEqual(read_api_key_from_shell_config(), None)
                    mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")


    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_no_api_key(self, mock_get_shell_rc_path):
        """Test with no API key export."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        with patch("builtins.open", mock_open(read_data="# No API key here\n")) as mock_file:
            self.assertIsNone(read_api_key_from_shell_config())
            mock_file.assert_called_once_with(self.test_rc_path, encoding="utf8")

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_malformed_api_key_export(self, mock_get_shell_rc_path):
        """Test with a malformed API key export."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        
        if os.name == "nt":
            with patch("builtins.open", mock_open(read_data=f"set API_KEY={self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)
            with patch("builtins.open", mock_open(read_data=f"CODEFLASH_API_KEY={self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)
            with patch("builtins.open", mock_open(read_data=f"set CODEFLASH_API_KEY=sk-{self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)
        else:
            with patch("builtins.open", mock_open(read_data=f"export API_KEY={self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)
            with patch("builtins.open", mock_open(read_data=f"CODEFLASH_API_KEY={self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)
            with patch("builtins.open", mock_open(read_data=f"export CODEFLASH_API_KEY=sk-{self.api_key}\n")):
                result = read_api_key_from_shell_config()
                self.assertIsNone(result)

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_multiple_api_key_exports(self, mock_get_shell_rc_path):
        """Test with multiple API key exports."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        if os.name == "nt":  # Windows
            first_export = 'set CODEFLASH_API_KEY=cf-firstkey'
            second_export = f'set CODEFLASH_API_KEY={self.api_key}'
        else:
            first_export = 'export CODEFLASH_API_KEY="cf-firstkey"'
            second_export = f'export CODEFLASH_API_KEY="{self.api_key}"'
        with patch(
            "builtins.open",
            mock_open(read_data=f'{first_export}\n{second_export}\n'),
        ):
            self.assertEqual(read_api_key_from_shell_config(), self.api_key)

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_api_key_export_with_extra_text(self, mock_get_shell_rc_path):
        """Test with extra text around API key export."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        with patch(
            "builtins.open",
            mock_open(read_data=f'# Setting API Key\n{self.api_key_export}\n# Done\n'),
        ):
            self.assertEqual(read_api_key_from_shell_config(), self.api_key)

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_api_key_in_comment(self, mock_get_shell_rc_path):
        """Test with API key export in a comment."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        with patch("builtins.open", mock_open(read_data=f'# {self.api_key_export}\n')):
            self.assertIsNone(read_api_key_from_shell_config())

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_file_does_not_exist(self, mock_get_shell_rc_path):
        """Test when the shell configuration file does not exist."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        with patch("builtins.open", side_effect=FileNotFoundError):
            self.assertIsNone(read_api_key_from_shell_config())

    @patch("codeflash.code_utils.shell_utils.get_shell_rc_path")
    def test_file_not_readable(self, mock_get_shell_rc_path):
        """Test when the shell configuration file is not readable."""
        mock_get_shell_rc_path.return_value = self.test_rc_path
        with patch("builtins.open", mock_open(read_data="")):
            mock_open.side_effect = PermissionError
            self.assertIsNone(read_api_key_from_shell_config())


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