"""
CopilotClient Unit Tests

This file is for unit tests. Where relevant, prefer to add e2e tests in e2e/*.py instead.
"""

from unittest.mock import AsyncMock, patch

import pytest

from copilot import CopilotClient, define_tool
from copilot.client import (
    ExternalServerConfig,
    ModelCapabilities,
    ModelInfo,
    ModelLimits,
    ModelSupports,
    SubprocessConfig,
)
from copilot.session import PermissionHandler, PermissionRequestResult
from e2e.testharness import CLI_PATH


class TestPermissionHandlerRequired:
    @pytest.mark.asyncio
    async def test_create_session_raises_without_permission_handler(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()
        try:
            with pytest.raises(TypeError, match="on_permission_request"):
                await client.create_session()  # type: ignore[call-arg]
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_create_session_raises_with_none_permission_handler(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()
        try:
            with pytest.raises(ValueError, match="on_permission_request handler is required"):
                await client.create_session(on_permission_request=None)  # type: ignore[arg-type]
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_v2_permission_adapter_rejects_no_result(self):
        client = CopilotClient(SubprocessConfig(CLI_PATH))
        await client.start()
        try:
            session = await client.create_session(
                on_permission_request=lambda request, invocation: PermissionRequestResult(
                    kind="no-result"
                )
            )
            with pytest.raises(ValueError, match="protocol v2 server"):
                await client._handle_permission_request_v2(
                    {
                        "sessionId": session.session_id,
                        "permissionRequest": {"kind": "write"},
                    }
                )
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_resume_session_raises_without_permission_handler(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()
        try:
            session = await client.create_session(
                on_permission_request=PermissionHandler.approve_all
            )
            with pytest.raises(ValueError, match="on_permission_request.*is required"):
                await client.resume_session(session.session_id, on_permission_request=None)
        finally:
            await client.force_stop()


class TestURLParsing:
    def test_parse_port_only_url(self):
        client = CopilotClient(ExternalServerConfig(url="8080"))
        assert client._actual_port == 8080
        assert client._actual_host == "localhost"
        assert client._is_external_server

    def test_parse_host_port_url(self):
        client = CopilotClient(ExternalServerConfig(url="127.0.0.1:9000"))
        assert client._actual_port == 9000
        assert client._actual_host == "127.0.0.1"
        assert client._is_external_server

    def test_parse_http_url(self):
        client = CopilotClient(ExternalServerConfig(url="http://localhost:7000"))
        assert client._actual_port == 7000
        assert client._actual_host == "localhost"
        assert client._is_external_server

    def test_parse_https_url(self):
        client = CopilotClient(ExternalServerConfig(url="https://example.com:443"))
        assert client._actual_port == 443
        assert client._actual_host == "example.com"
        assert client._is_external_server

    def test_invalid_url_format(self):
        with pytest.raises(ValueError, match="Invalid cli_url format"):
            CopilotClient(ExternalServerConfig(url="invalid-url"))

    def test_invalid_port_too_high(self):
        with pytest.raises(ValueError, match="Invalid port in cli_url"):
            CopilotClient(ExternalServerConfig(url="localhost:99999"))

    def test_invalid_port_zero(self):
        with pytest.raises(ValueError, match="Invalid port in cli_url"):
            CopilotClient(ExternalServerConfig(url="localhost:0"))

    def test_invalid_port_negative(self):
        with pytest.raises(ValueError, match="Invalid port in cli_url"):
            CopilotClient(ExternalServerConfig(url="localhost:-1"))

    def test_is_external_server_true(self):
        client = CopilotClient(ExternalServerConfig(url="localhost:8080"))
        assert client._is_external_server


class TestSessionFsConfig:
    def test_missing_initial_cwd(self):
        with pytest.raises(ValueError, match="session_fs.initial_cwd is required"):
            CopilotClient(
                SubprocessConfig(
                    cli_path=CLI_PATH,
                    log_level="error",
                    session_fs={
                        "initial_cwd": "",
                        "session_state_path": "/session-state",
                        "conventions": "posix",
                    },
                )
            )

    def test_missing_session_state_path(self):
        with pytest.raises(ValueError, match="session_fs.session_state_path is required"):
            CopilotClient(
                SubprocessConfig(
                    cli_path=CLI_PATH,
                    log_level="error",
                    session_fs={
                        "initial_cwd": "/",
                        "session_state_path": "",
                        "conventions": "posix",
                    },
                )
            )


class TestAuthOptions:
    def test_accepts_github_token(self):
        client = CopilotClient(
            SubprocessConfig(
                cli_path=CLI_PATH,
                github_token="gho_test_token",
                log_level="error",
            )
        )
        assert isinstance(client._config, SubprocessConfig)
        assert client._config.github_token == "gho_test_token"

    def test_default_use_logged_in_user_true_without_token(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH, log_level="error"))
        assert isinstance(client._config, SubprocessConfig)
        assert client._config.use_logged_in_user is True

    def test_default_use_logged_in_user_false_with_token(self):
        client = CopilotClient(
            SubprocessConfig(
                cli_path=CLI_PATH,
                github_token="gho_test_token",
                log_level="error",
            )
        )
        assert isinstance(client._config, SubprocessConfig)
        assert client._config.use_logged_in_user is False

    def test_explicit_use_logged_in_user_true_with_token(self):
        client = CopilotClient(
            SubprocessConfig(
                cli_path=CLI_PATH,
                github_token="gho_test_token",
                use_logged_in_user=True,
                log_level="error",
            )
        )
        assert isinstance(client._config, SubprocessConfig)
        assert client._config.use_logged_in_user is True

    def test_explicit_use_logged_in_user_false_without_token(self):
        client = CopilotClient(
            SubprocessConfig(
                cli_path=CLI_PATH,
                use_logged_in_user=False,
                log_level="error",
            )
        )
        assert isinstance(client._config, SubprocessConfig)
        assert client._config.use_logged_in_user is False


class TestOverridesBuiltInTool:
    @pytest.mark.asyncio
    async def test_overrides_built_in_tool_sent_in_tool_definition(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                return await original_request(method, params)

            client._client.request = mock_request

            @define_tool(description="Custom grep", overrides_built_in_tool=True)
            def grep(params) -> str:
                return "ok"

            await client.create_session(
                on_permission_request=PermissionHandler.approve_all, tools=[grep]
            )
            tool_defs = captured["session.create"]["tools"]
            assert len(tool_defs) == 1
            assert tool_defs[0]["name"] == "grep"
            assert tool_defs[0]["overridesBuiltInTool"] is True
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_resume_session_sends_overrides_built_in_tool(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            session = await client.create_session(
                on_permission_request=PermissionHandler.approve_all
            )

            captured = {}

            async def mock_request(method, params):
                captured[method] = params
                # Return a fake response instead of calling the real CLI,
                # which would fail without auth credentials.
                return {"sessionId": params["sessionId"]}

            client._client.request = mock_request

            @define_tool(description="Custom grep", overrides_built_in_tool=True)
            def grep(params) -> str:
                return "ok"

            await client.resume_session(
                session.session_id,
                on_permission_request=PermissionHandler.approve_all,
                tools=[grep],
            )
            tool_defs = captured["session.resume"]["tools"]
            assert len(tool_defs) == 1
            assert tool_defs[0]["overridesBuiltInTool"] is True
        finally:
            await client.force_stop()


class TestOnListModels:
    @pytest.mark.asyncio
    async def test_list_models_with_custom_handler(self):
        """Test that on_list_models handler is called instead of RPC"""
        custom_models = [
            ModelInfo(
                id="my-custom-model",
                name="My Custom Model",
                capabilities=ModelCapabilities(
                    supports=ModelSupports(vision=False, reasoning_effort=False),
                    limits=ModelLimits(max_context_window_tokens=128000),
                ),
            )
        ]

        handler_calls = []

        def handler():
            handler_calls.append(1)
            return custom_models

        client = CopilotClient(
            SubprocessConfig(cli_path=CLI_PATH),
            on_list_models=handler,
        )
        await client.start()
        try:
            models = await client.list_models()
            assert len(handler_calls) == 1
            assert models == custom_models
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_list_models_handler_caches_results(self):
        """Test that on_list_models results are cached"""
        custom_models = [
            ModelInfo(
                id="cached-model",
                name="Cached Model",
                capabilities=ModelCapabilities(
                    supports=ModelSupports(vision=False, reasoning_effort=False),
                    limits=ModelLimits(max_context_window_tokens=128000),
                ),
            )
        ]

        handler_calls = []

        def handler():
            handler_calls.append(1)
            return custom_models

        client = CopilotClient(
            SubprocessConfig(cli_path=CLI_PATH),
            on_list_models=handler,
        )
        await client.start()
        try:
            await client.list_models()
            await client.list_models()
            assert len(handler_calls) == 1  # Only called once due to caching
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_list_models_async_handler(self):
        """Test that async on_list_models handler works"""
        custom_models = [
            ModelInfo(
                id="async-model",
                name="Async Model",
                capabilities=ModelCapabilities(
                    supports=ModelSupports(vision=False, reasoning_effort=False),
                    limits=ModelLimits(max_context_window_tokens=128000),
                ),
            )
        ]

        async def handler():
            return custom_models

        client = CopilotClient(
            SubprocessConfig(cli_path=CLI_PATH),
            on_list_models=handler,
        )
        await client.start()
        try:
            models = await client.list_models()
            assert models == custom_models
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_list_models_handler_without_start(self):
        """Test that on_list_models works without starting the CLI connection"""
        custom_models = [
            ModelInfo(
                id="no-start-model",
                name="No Start Model",
                capabilities=ModelCapabilities(
                    supports=ModelSupports(vision=False, reasoning_effort=False),
                    limits=ModelLimits(max_context_window_tokens=128000),
                ),
            )
        ]

        handler_calls = []

        def handler():
            handler_calls.append(1)
            return custom_models

        client = CopilotClient(
            SubprocessConfig(cli_path=CLI_PATH),
            on_list_models=handler,
        )
        models = await client.list_models()
        assert len(handler_calls) == 1
        assert models == custom_models


class TestSessionConfigForwarding:
    @pytest.mark.asyncio
    async def test_create_session_forwards_client_name(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                return await original_request(method, params)

            client._client.request = mock_request
            await client.create_session(
                on_permission_request=PermissionHandler.approve_all, client_name="my-app"
            )
            assert captured["session.create"]["clientName"] == "my-app"
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_resume_session_forwards_client_name(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            session = await client.create_session(
                on_permission_request=PermissionHandler.approve_all
            )

            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                if method == "session.resume":
                    # Return a fake response to avoid needing real auth
                    return {"sessionId": session.session_id}
                return await original_request(method, params)

            client._client.request = mock_request
            await client.resume_session(
                session.session_id,
                on_permission_request=PermissionHandler.approve_all,
                client_name="my-app",
            )
            assert captured["session.resume"]["clientName"] == "my-app"
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_create_session_forwards_agent(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                return await original_request(method, params)

            client._client.request = mock_request
            await client.create_session(
                on_permission_request=PermissionHandler.approve_all,
                agent="test-agent",
                custom_agents=[{"name": "test-agent", "prompt": "You are a test agent."}],
            )
            assert captured["session.create"]["agent"] == "test-agent"
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_resume_session_forwards_agent(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            session = await client.create_session(
                on_permission_request=PermissionHandler.approve_all
            )

            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                if method == "session.resume":
                    return {"sessionId": session.session_id}
                return await original_request(method, params)

            client._client.request = mock_request
            await client.resume_session(
                session.session_id,
                on_permission_request=PermissionHandler.approve_all,
                agent="test-agent",
                custom_agents=[{"name": "test-agent", "prompt": "You are a test agent."}],
            )
            assert captured["session.resume"]["agent"] == "test-agent"
        finally:
            await client.force_stop()

    @pytest.mark.asyncio
    async def test_set_model_sends_correct_rpc(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        await client.start()

        try:
            session = await client.create_session(
                on_permission_request=PermissionHandler.approve_all
            )

            captured = {}
            original_request = client._client.request

            async def mock_request(method, params):
                captured[method] = params
                if method == "session.model.switchTo":
                    return {}
                return await original_request(method, params)

            client._client.request = mock_request
            await session.set_model("gpt-4.1")
            assert captured["session.model.switchTo"]["sessionId"] == session.session_id
            assert captured["session.model.switchTo"]["modelId"] == "gpt-4.1"
        finally:
            await client.force_stop()


class TestCopilotClientContextManager:
    @pytest.mark.asyncio
    async def test_aenter_calls_start_and_returns_self(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        with patch.object(client, "start", new_callable=AsyncMock) as mock_start:
            result = await client.__aenter__()
            mock_start.assert_awaited_once()
            assert result is client

    @pytest.mark.asyncio
    async def test_aexit_calls_stop(self):
        client = CopilotClient(SubprocessConfig(cli_path=CLI_PATH))
        with patch.object(client, "stop", new_callable=AsyncMock) as mock_stop:
            await client.__aexit__(None, None, None)
            mock_stop.assert_awaited_once()


class TestCopilotSessionContextManager:
    @pytest.mark.asyncio
    async def test_aenter_returns_self(self):
        from copilot.session import CopilotSession

        session = CopilotSession.__new__(CopilotSession)
        result = await session.__aenter__()
        assert result is session

    @pytest.mark.asyncio
    async def test_aexit_calls_disconnect(self):
        from copilot.session import CopilotSession

        session = CopilotSession.__new__(CopilotSession)
        with patch.object(session, "disconnect", new_callable=AsyncMock) as mock_disconnect:
            await session.__aexit__(None, None, None)
            mock_disconnect.assert_awaited_once()