"""
Tests for terminal detection functionality in enhance_skill_local.py

This module tests the detect_terminal_app() function and terminal launching logic
to ensure correct terminal selection across different environments.
"""

import os
import sys
import unittest
from pathlib import Path
from unittest.mock import MagicMock, patch

# Add parent directory to path for imports
sys.path.insert(0, str(Path(__file__).parent.parent))

from skill_seekers.cli.enhance_skill_local import LocalSkillEnhancer, detect_terminal_app


class TestDetectTerminalApp(unittest.TestCase):
    """Test the detect_terminal_app() function."""

    original_skill_seeker: str | None = None
    original_term_program: str | None = None

    def setUp(self):
        """Save original environment variables."""
        self.original_skill_seeker = os.environ.get("SKILL_SEEKER_TERMINAL")
        self.original_term_program = os.environ.get("TERM_PROGRAM")

    def tearDown(self):
        """Restore original environment variables."""
        # Remove test env vars
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]
        if "TERM_PROGRAM" in os.environ:
            del os.environ["TERM_PROGRAM"]

        # Restore originals if they existed
        if self.original_skill_seeker is not None:
            os.environ["SKILL_SEEKER_TERMINAL"] = self.original_skill_seeker
        if self.original_term_program is not None:
            os.environ["TERM_PROGRAM"] = self.original_term_program

    # HIGH PRIORITY TESTS

    def test_detect_terminal_with_skill_seeker_env(self):
        """Test that SKILL_SEEKER_TERMINAL env var takes highest priority."""
        os.environ["SKILL_SEEKER_TERMINAL"] = "Ghostty"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Ghostty")
        self.assertEqual(detection_method, "SKILL_SEEKER_TERMINAL")

    def test_detect_terminal_with_term_program_known(self):
        """Test detection from TERM_PROGRAM with known terminal (iTerm)."""
        # Ensure SKILL_SEEKER_TERMINAL is not set
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        os.environ["TERM_PROGRAM"] = "iTerm.app"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "iTerm")
        self.assertEqual(detection_method, "TERM_PROGRAM")

    def test_detect_terminal_with_term_program_ghostty(self):
        """Test detection from TERM_PROGRAM with Ghostty terminal."""
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        os.environ["TERM_PROGRAM"] = "ghostty"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Ghostty")
        self.assertEqual(detection_method, "TERM_PROGRAM")

    def test_detect_terminal_with_term_program_apple_terminal(self):
        """Test detection from TERM_PROGRAM with Apple Terminal."""
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        os.environ["TERM_PROGRAM"] = "Apple_Terminal"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Terminal")
        self.assertEqual(detection_method, "TERM_PROGRAM")

    def test_detect_terminal_with_term_program_wezterm(self):
        """Test detection from TERM_PROGRAM with WezTerm."""
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        os.environ["TERM_PROGRAM"] = "WezTerm"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "WezTerm")
        self.assertEqual(detection_method, "TERM_PROGRAM")

    def test_detect_terminal_with_term_program_unknown(self):
        """Test fallback behavior when TERM_PROGRAM is unknown (e.g., IDE terminals)."""
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        os.environ["TERM_PROGRAM"] = "zed"

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Terminal")
        self.assertEqual(detection_method, "unknown TERM_PROGRAM (zed)")

    def test_detect_terminal_default_fallback(self):
        """Test default fallback when no environment variables are set."""
        # Remove both env vars
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]
        if "TERM_PROGRAM" in os.environ:
            del os.environ["TERM_PROGRAM"]

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Terminal")
        self.assertEqual(detection_method, "default")

    def test_detect_terminal_priority_order(self):
        """Test that SKILL_SEEKER_TERMINAL takes priority over TERM_PROGRAM."""
        os.environ["SKILL_SEEKER_TERMINAL"] = "Ghostty"
        os.environ["TERM_PROGRAM"] = "iTerm.app"

        terminal_app, detection_method = detect_terminal_app()

        # SKILL_SEEKER_TERMINAL should win
        self.assertEqual(terminal_app, "Ghostty")
        self.assertEqual(detection_method, "SKILL_SEEKER_TERMINAL")

    @patch("subprocess.Popen")
    def test_subprocess_popen_called_with_correct_args(self, mock_popen):
        """Test that subprocess.Popen is called with correct arguments on macOS."""
        # Only test on macOS
        if sys.platform != "darwin":
            self.skipTest("This test only runs on macOS")

        # Setup
        os.environ["SKILL_SEEKER_TERMINAL"] = "Ghostty"

        # Create a test skill directory with minimal setup
        import tempfile

        with tempfile.TemporaryDirectory() as tmpdir:
            skill_dir = Path(tmpdir) / "test_skill"
            skill_dir.mkdir()

            # Create references directory (required by LocalSkillEnhancer)
            (skill_dir / "references").mkdir()
            (skill_dir / "references" / "test.md").write_text("# Test")

            # Create SKILL.md (required)
            (skill_dir / "SKILL.md").write_text("---\nname: test\n---\n# Test")

            # Mock Popen to prevent actual terminal launch
            mock_popen.return_value = MagicMock()

            # Run enhancer in interactive mode (not headless)
            enhancer = LocalSkillEnhancer(skill_dir)
            _result = enhancer.run(headless=False)

            # Verify Popen was called
            self.assertTrue(mock_popen.called)

            # Verify call arguments
            call_args = mock_popen.call_args[0][0]
            self.assertEqual(call_args[0], "open")
            self.assertEqual(call_args[1], "-a")
            self.assertEqual(call_args[2], "Ghostty")
            # call_args[3] should be the script file path
            self.assertTrue(call_args[3].endswith(".sh"))

    # MEDIUM PRIORITY TESTS

    def test_detect_terminal_whitespace_handling(self):
        """Test that whitespace is stripped from environment variables."""
        os.environ["SKILL_SEEKER_TERMINAL"] = "  Ghostty  "

        terminal_app, detection_method = detect_terminal_app()

        self.assertEqual(terminal_app, "Ghostty")
        self.assertEqual(detection_method, "SKILL_SEEKER_TERMINAL")

    def test_detect_terminal_empty_string_env_vars(self):
        """Test that empty string env vars fall through to next priority."""
        os.environ["SKILL_SEEKER_TERMINAL"] = ""
        os.environ["TERM_PROGRAM"] = "iTerm.app"

        terminal_app, detection_method = detect_terminal_app()

        # Should skip empty SKILL_SEEKER_TERMINAL and use TERM_PROGRAM
        self.assertEqual(terminal_app, "iTerm")
        self.assertEqual(detection_method, "TERM_PROGRAM")

    def test_detect_terminal_empty_string_both_vars(self):
        """Test that empty strings on both vars falls back to default."""
        os.environ["SKILL_SEEKER_TERMINAL"] = ""
        os.environ["TERM_PROGRAM"] = ""

        terminal_app, detection_method = detect_terminal_app()

        # Should fall back to default
        self.assertEqual(terminal_app, "Terminal")
        # Empty TERM_PROGRAM should be treated as not set
        self.assertEqual(detection_method, "default")

    @patch("subprocess.Popen")
    def test_terminal_launch_error_handling(self, mock_popen):
        """Test error handling when terminal launch fails."""
        # Only test on macOS
        if sys.platform != "darwin":
            self.skipTest("This test only runs on macOS")

        # Setup Popen to raise exception
        mock_popen.side_effect = Exception("Terminal not found")

        import tempfile

        with tempfile.TemporaryDirectory() as tmpdir:
            skill_dir = Path(tmpdir) / "test_skill"
            skill_dir.mkdir()
            (skill_dir / "references").mkdir()
            (skill_dir / "references" / "test.md").write_text("# Test")
            (skill_dir / "SKILL.md").write_text("---\nname: test\n---\n# Test")

            enhancer = LocalSkillEnhancer(skill_dir)

            # Capture stdout to check error message
            from io import StringIO

            captured_output = StringIO()
            old_stdout = sys.stdout
            sys.stdout = captured_output

            # Run in interactive mode (not headless) to test terminal launch
            result = enhancer.run(headless=False)

            # Restore stdout
            sys.stdout = old_stdout

            # Should return False on error
            self.assertFalse(result)

            # Should print error message
            output = captured_output.getvalue()
            self.assertIn("Error launching", output)

    def test_output_message_unknown_terminal(self):
        """Test that unknown terminal prints warning message."""
        if sys.platform != "darwin":
            self.skipTest("This test only runs on macOS")

        os.environ["TERM_PROGRAM"] = "vscode"
        if "SKILL_SEEKER_TERMINAL" in os.environ:
            del os.environ["SKILL_SEEKER_TERMINAL"]

        import tempfile

        with tempfile.TemporaryDirectory() as tmpdir:
            skill_dir = Path(tmpdir) / "test_skill"
            skill_dir.mkdir()
            (skill_dir / "references").mkdir()
            (skill_dir / "references" / "test.md").write_text("# Test")
            (skill_dir / "SKILL.md").write_text("---\nname: test\n---\n# Test")

            enhancer = LocalSkillEnhancer(skill_dir)

            # Capture stdout
            from io import StringIO

            captured_output = StringIO()
            old_stdout = sys.stdout
            sys.stdout = captured_output

            # Mock Popen to prevent actual launch
            with patch("subprocess.Popen") as mock_popen:
                mock_popen.return_value = MagicMock()
                # Run in interactive mode (not headless) to test terminal detection
                enhancer.run(headless=False)

            # Restore stdout
            sys.stdout = old_stdout

            output = captured_output.getvalue()

            # Should contain warning about unknown terminal
            self.assertIn("⚠️", output)
            self.assertIn("unknown TERM_PROGRAM", output)
            self.assertIn("vscode", output)
            self.assertIn("Using Terminal.app as fallback", output)


class TestTerminalMapCompleteness(unittest.TestCase):
    """Test that TERMINAL_MAP covers all documented terminals."""

    def test_terminal_map_has_all_documented_terminals(self):
        """Verify TERMINAL_MAP contains all terminals mentioned in documentation."""
        from skill_seekers.cli.enhance_skill_local import detect_terminal_app

        # Get the TERMINAL_MAP from the function's scope
        # We need to test this indirectly by checking each known terminal

        known_terminals = [
            ("Apple_Terminal", "Terminal"),
            ("iTerm.app", "iTerm"),
            ("ghostty", "Ghostty"),
            ("WezTerm", "WezTerm"),
        ]

        for term_program_value, expected_app_name in known_terminals:
            # Set TERM_PROGRAM and verify detection
            os.environ["TERM_PROGRAM"] = term_program_value
            if "SKILL_SEEKER_TERMINAL" in os.environ:
                del os.environ["SKILL_SEEKER_TERMINAL"]

            terminal_app, detection_method = detect_terminal_app()

            self.assertEqual(
                terminal_app,
                expected_app_name,
                f"TERM_PROGRAM='{term_program_value}' should map to '{expected_app_name}'",
            )
            self.assertEqual(detection_method, "TERM_PROGRAM")


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