"""Unit tests for the Dana REPL class.

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MIT License

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"""

import unittest
from unittest.mock import MagicMock, patch

import pytest

from dana.apps.repl.repl import REPL
from dana.common.error_utils import DanaError
from dana.core.lang.log_manager import LogLevel
from dana.core.lang.sandbox_context import SandboxContext


@pytest.mark.unit
class TestRepl(unittest.TestCase):
    """Test the core functionality of the REPL class."""

    def setUp(self):
        """Set up test fixtures."""
        self.context = SandboxContext()
        self.repl = REPL(context=self.context)

    def test_initialize_repl(self):
        """Test REPL initialization with different parameters."""
        # Test default initialization
        repl = REPL()
        self.assertIsNotNone(repl.context)
        self.assertIsNotNone(repl.interpreter)
        self.assertIsNone(repl.transcoder)

        # Test with log level
        repl = REPL(log_level=LogLevel.DEBUG)
        self.assertIsNotNone(repl.context)

        # Test with context
        custom_context = SandboxContext()
        repl = REPL(context=custom_context)
        self.assertEqual(repl.context, custom_context)

    def test_execute_simple_program(self):
        """Test executing a simple Dana program."""
        result = self.repl.execute("private:x = 5")
        self.assertEqual(result, 5)

        # Verify the variable was set in context
        self.assertEqual(self.context.get("private:x"), 5)  # Use dot notation for context access

    def test_execute_with_initial_context(self):
        """Test executing a program with initial context."""
        # Use dot notation for context setting but colon for Dana code
        result = self.repl.execute("private:x + 10", initial_context={"private:x": 5})
        self.assertEqual(result, 15)

    def test_execute_multi_statement_program(self):
        """Test executing a multi-statement program."""
        program = """
private:x = 5
private:y = 10
private:x + private:y
"""
        result = self.repl.execute(program)
        self.assertEqual(result, 15)

    def test_execute_if_statement(self):
        """Test executing a program with if statement."""
        program = """
private:x = 5
if private:x > 3:
    private:result = "greater"
else:
    private:result = "less"
private:result
"""
        result = self.repl.execute(program)
        self.assertEqual(result, "greater")

    def test_execute_invalid_syntax(self):
        """Test executing a program with invalid syntax."""
        with self.assertRaises(DanaError) as context:
            self.repl.execute("private:x =")
        self.assertIn("Syntax Error", str(context.exception))

    def test_get_and_set_nlp_mode(self):
        """Test getting and setting NLP mode."""
        # Default should be False
        self.assertFalse(self.repl.get_nlp_mode())

        # Set to True
        self.repl.set_nlp_mode(True)
        self.assertTrue(self.repl.get_nlp_mode())

        # Set back to False
        self.repl.set_nlp_mode(False)
        self.assertFalse(self.repl.get_nlp_mode())

    @patch("dana.common.utils.Misc.safe_asyncio_run")
    def test_execute_with_nlp_mode(self, mock_safe_asyncio_run):
        """Test executing a program with NLP mode enabled."""
        # Setup mock async run that returns the MagicMock for the parse result and translated code
        mock_result = MagicMock()
        mock_result.errors = []
        mock_safe_asyncio_run.return_value = (mock_result, "private:x = 5")

        # Create a direct mock for the transcoder
        mock_transcoder = MagicMock()

        # Create REPL with direct transcoder mock (bypassing the constructor)
        repl = REPL()
        repl.transcoder = mock_transcoder

        # Enable NLP mode
        repl.set_nlp_mode(True)

        # Mock all needed methods to isolate the test
        with patch.object(repl, "_format_error_message"):  # Prevent error formatting
            with patch.object(repl.sandbox, "execute_string") as mock_execute_string:
                # Set up sandbox execute_string to return success
                mock_result = MagicMock()
                mock_result.success = True
                mock_result.result = 5
                mock_execute_string.return_value = mock_result

                # Execute with NLP input - this should use the mocked safe_asyncio_run
                with patch("dana.common.utils.Misc.safe_asyncio_run", mock_safe_asyncio_run):
                    result = repl.execute("set x to 5")

                    # Verify expected behavior - safe_asyncio_run may be called multiple times
                    # (once for LLM initialization, once for transcoding)
                    # Just check that it was called with the transcoder at least once
                    transcoder_calls = [
                        call
                        for call in mock_safe_asyncio_run.call_args_list
                        if len(call[0]) >= 2 and call[0][0] == mock_transcoder.to_dana_with_context
                    ]
                    assert len(transcoder_calls) >= 1, "Expected at least one call to transcoder"
                    # Verify the transcoder was called with the right arguments
                    transcoder_call = transcoder_calls[0]
                    assert transcoder_call[0][1] == "set x to 5"
                    assert transcoder_call[0][2] == repl.context
                    self.assertEqual(result, 5)

    def test_get_context(self):
        """Test getting the context."""
        context = self.repl.get_context()
        self.assertEqual(context, self.context)

    def test_set_log_level(self):
        """Test setting log level."""
        # Initial log level
        initial_level = LogLevel.WARN

        # Create REPL with specific log level
        repl = REPL(log_level=initial_level)

        # Change log level
        with patch("dana.core.lang.log_manager.SandboxLogger.set_system_log_level") as mock_set_level:
            repl.set_log_level(LogLevel.DEBUG)
            # Verify log level was set
            mock_set_level.assert_called_once_with(LogLevel.DEBUG, repl.context)

    def test_format_error_message(self):
        """Test error message formatting."""
        # Test syntax error formatting
        error_msg = "Unexpected token Token('NAME', 'print') at line 1, column 5"
        formatted = self.repl._format_error_message(error_msg, "if x print")
        self.assertIn("Syntax Error:", formatted)
        self.assertIn("Unexpected character or symbol", formatted)

        # Test execution error formatting
        error_msg = "Unsupported expression type: <class 'NoneType'>"
        formatted = self.repl._format_error_message(error_msg, "private:x = None + 5")
        self.assertIn("Error:", formatted)


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