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

REPO_ROOT = Path(__file__).resolve().parents[1]
sys.path.insert(0, str(REPO_ROOT / "opax-mcp"))

from gitea_handler import handle_list_repo_files

class TestGiteaHandler(unittest.TestCase):

    def setUp(self):
        self.original_gitea_url = os.environ.get("GITEA_URL")
        self.original_gitea_token = os.environ.get("GITEA_TOKEN")
        os.environ["GITEA_URL"] = "https://gitea.example.com"
        os.environ["GITEA_TOKEN"] = "test-token"

    def tearDown(self):
        if self.original_gitea_url is not None:
            os.environ["GITEA_URL"] = self.original_gitea_url
        else:
            del os.environ["GITEA_URL"]
        if self.original_gitea_token is not None:
            os.environ["GITEA_TOKEN"] = self.original_gitea_token
        else:
            del os.environ["GITEA_TOKEN"]

    def _prepare_mock_client(self, payload, is_file=False):
        response = MagicMock()
        response.raise_for_status = MagicMock()
        if is_file:
            response.json.return_value = {"name": "file.txt", "path": "file.txt", "type": "file"}
        else:
            response.json.return_value = payload
        
        client = MagicMock()
        client.get = AsyncMock(return_value=response)

        async_client = MagicMock()
        async_client.__aenter__ = AsyncMock(return_value=client)
        async_client.__aexit__ = AsyncMock(return_value=None)

        return async_client, client

    @patch("httpx.AsyncClient")
    def test_list_repo_files_root(self, mock_async_client_constructor):
        payload = [
            {"name": "README.md", "path": "README.md", "type": "file", "sha": "sha123", "size": 1024},
            {"name": "docs", "path": "docs", "type": "dir"}
        ]
        mock_async_client, _ = self._prepare_mock_client(payload)
        mock_async_client_constructor.return_value = mock_async_client

        async def run_test():
            result = await handle_list_repo_files({"path": None}, "test/repo")
            self.assertEqual(result["path"], "")
            self.assertEqual(len(result["files"]), 2)
            self.assertEqual(result["files"][0]["name"], "README.md")
            self.assertIn("sha", result["files"][0])
            self.assertIn("size", result["files"][0])
            self.assertEqual(result["files"][1]["name"], "docs")
            self.assertNotIn("sha", result["files"][1])
            self.assertNotIn("size", result["files"][1])

        import asyncio
        asyncio.run(run_test())
    
    @patch("httpx.AsyncClient")
    def test_list_repo_files_empty_path(self, mock_async_client_constructor):
        payload = []
        mock_async_client, _ = self._prepare_mock_client(payload)
        mock_async_client_constructor.return_value = mock_async_client
        async def run_test():
            result = await handle_list_repo_files({"path": ""}, "test/repo")
            self.assertEqual(result["path"], "")
        import asyncio
        asyncio.run(run_test())

    @patch("httpx.AsyncClient")
    def test_list_repo_files_dot_path(self, mock_async_client_constructor):
        payload = []
        mock_async_client, _ = self._prepare_mock_client(payload)
        mock_async_client_constructor.return_value = mock_async_client
        async def run_test():
            result = await handle_list_repo_files({"path": "."}, "test/repo")
            self.assertEqual(result["path"], "")
        import asyncio
        asyncio.run(run_test())

    @patch("httpx.AsyncClient")
    def test_nested_path(self, mock_async_client_constructor):
        payload = []
        mock_async_client, mock_client = self._prepare_mock_client(payload)
        mock_async_client_constructor.return_value = mock_async_client
        async def run_test():
            await handle_list_repo_files({"path": "docs/security"}, "test/repo")
            mock_client.get.assert_called_once()
            called_url = mock_client.get.call_args[0][0]
            self.assertIn("docs/security", called_url)

        import asyncio
        asyncio.run(run_test())

    @patch("httpx.AsyncClient")
    def test_path_is_file(self, mock_async_client_constructor):
        mock_async_client, _ = self._prepare_mock_client(None, is_file=True)
        mock_async_client_constructor.return_value = mock_async_client
        async def run_test():
            with self.assertRaisesRegex(ValueError, "Path is a file, not a directory. Use get_file_content instead."):
                await handle_list_repo_files({"path": "file.txt"}, "test/repo")
        import asyncio
        asyncio.run(run_test())

    def test_invalid_paths(self):
        invalid_paths = [
            "../secrets",
            "docs/../secrets",
            "docs\\secrets",
            "/etc/passwd",
            "https://example.com",
            "docs?ref=other",
            "docs#fragment",
            "docs//security",
            "docs/./security",
        ]
        async def run_test():
            for path in invalid_paths:
                with self.subTest(path=path):
                    with self.assertRaisesRegex(ValueError, "Invalid repository path."):
                        await handle_list_repo_files({"path": path}, "test/repo")
        import asyncio
        asyncio.run(run_test())

    def test_invalid_input_types(self):
        async def run_test():
            with self.assertRaisesRegex(ValueError, "Invalid repository path."):
                await handle_list_repo_files({"path": 123}, "test/repo")
        import asyncio
        asyncio.run(run_test())

    def test_unsupported_fields(self):
        unsupported = [
            {"repo": "x"},
            {"ref": "y"},
            {"branch": "z"},
            {"extra": "key"},
        ]
        async def run_test():
            for p in unsupported:
                with self.subTest(p=p):
                    with self.assertRaisesRegex(ValueError, "Unsupported list_repo_files input field."):
                        await handle_list_repo_files(p, "test/repo")
        import asyncio
        asyncio.run(run_test())

    @patch("httpx.AsyncClient")
    def test_uses_trusted_repo(self, mock_async_client_constructor):
        payload = []
        mock_async_client, mock_client = self._prepare_mock_client(payload)
        mock_async_client_constructor.return_value = mock_async_client
        async def run_test():
            await handle_list_repo_files({"path": "docs", "repo": "user/bad-repo"}, "test/repo")
            # The handler should raise an error due to the unsupported 'repo' field.
        import asyncio
        with self.assertRaisesRegex(ValueError, "Unsupported list_repo_files input field."):
            asyncio.run(run_test())

    @patch("httpx.AsyncClient")
    def test_http_error_propagation(self, mock_async_client_constructor):
        response = MagicMock()
        response.raise_for_status.side_effect = httpx.HTTPStatusError("Error", request=MagicMock(), response=MagicMock())
        client = MagicMock()
        client.get = AsyncMock(return_value=response)
        async_client = MagicMock()
        async_client.__aenter__ = AsyncMock(return_value=client)
        async_client.__aexit__ = AsyncMock(return_value=None)
        mock_async_client_constructor.return_value = async_client

        async def run_test():
            with self.assertRaises(httpx.HTTPStatusError):
                await handle_list_repo_files({"path": ""}, "test/repo")
        
        import asyncio
        asyncio.run(run_test())

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