import json
import logging
from dataclasses import dataclass
from typing import Any, TypedDict

import pytest
from pydantic import BaseModel

from mcp.server.mcpserver import Context, MCPServer
from mcp.server.mcpserver.exceptions import ToolError
from mcp.server.mcpserver.tools import Tool, ToolManager
from mcp.server.mcpserver.utilities.func_metadata import ArgModelBase, FuncMetadata
from mcp.server.session import ServerSessionT
from mcp.shared.context import LifespanContextT, RequestT
from mcp.types import TextContent, ToolAnnotations


class TestAddTools:
    def test_basic_function(self):
        """Test registering and running a basic function."""

        def sum(a: int, b: int) -> int:  # pragma: no cover
            """Add two numbers."""
            return a + b

        manager = ToolManager()
        manager.add_tool(sum)

        tool = manager.get_tool("sum")
        assert tool is not None
        assert tool.name == "sum"
        assert tool.description == "Add two numbers."
        assert tool.is_async is False
        assert tool.parameters["properties"]["a"]["type"] == "integer"
        assert tool.parameters["properties"]["b"]["type"] == "integer"

    def test_init_with_tools(self, caplog: pytest.LogCaptureFixture):
        def sum(a: int, b: int) -> int:  # pragma: no cover
            return a + b

        class AddArguments(ArgModelBase):
            a: int
            b: int

        fn_metadata = FuncMetadata(arg_model=AddArguments)

        original_tool = Tool(
            name="sum",
            title="Add Tool",
            description="Add two numbers.",
            fn=sum,
            fn_metadata=fn_metadata,
            is_async=False,
            parameters=AddArguments.model_json_schema(),
            context_kwarg=None,
            annotations=None,
        )
        manager = ToolManager(tools=[original_tool])
        saved_tool = manager.get_tool("sum")
        assert saved_tool == original_tool

        # warn on duplicate tools
        with caplog.at_level(logging.WARNING):
            manager = ToolManager(True, tools=[original_tool, original_tool])
            assert "Tool already exists: sum" in caplog.text

    @pytest.mark.anyio
    async def test_async_function(self):
        """Test registering and running an async function."""

        async def fetch_data(url: str) -> str:  # pragma: no cover
            """Fetch data from URL."""
            return f"Data from {url}"

        manager = ToolManager()
        manager.add_tool(fetch_data)

        tool = manager.get_tool("fetch_data")
        assert tool is not None
        assert tool.name == "fetch_data"
        assert tool.description == "Fetch data from URL."
        assert tool.is_async is True
        assert tool.parameters["properties"]["url"]["type"] == "string"

    def test_pydantic_model_function(self):
        """Test registering a function that takes a Pydantic model."""

        class UserInput(BaseModel):
            name: str
            age: int

        def create_user(user: UserInput, flag: bool) -> dict[str, Any]:  # pragma: no cover
            """Create a new user."""
            return {"id": 1, **user.model_dump()}

        manager = ToolManager()
        manager.add_tool(create_user)

        tool = manager.get_tool("create_user")
        assert tool is not None
        assert tool.name == "create_user"
        assert tool.description == "Create a new user."
        assert tool.is_async is False
        assert "name" in tool.parameters["$defs"]["UserInput"]["properties"]
        assert "age" in tool.parameters["$defs"]["UserInput"]["properties"]
        assert "flag" in tool.parameters["properties"]

    def test_add_callable_object(self):
        """Test registering a callable object."""

        class MyTool:
            def __init__(self):
                self.__name__ = "MyTool"

            def __call__(self, x: int) -> int:  # pragma: no cover
                return x * 2

        manager = ToolManager()
        tool = manager.add_tool(MyTool())
        assert tool.name == "MyTool"
        assert tool.is_async is False
        assert tool.parameters["properties"]["x"]["type"] == "integer"

    @pytest.mark.anyio
    async def test_add_async_callable_object(self):
        """Test registering an async callable object."""

        class MyAsyncTool:
            def __init__(self):
                self.__name__ = "MyAsyncTool"

            async def __call__(self, x: int) -> int:  # pragma: no cover
                return x * 2

        manager = ToolManager()
        tool = manager.add_tool(MyAsyncTool())
        assert tool.name == "MyAsyncTool"
        assert tool.is_async is True
        assert tool.parameters["properties"]["x"]["type"] == "integer"

    def test_add_invalid_tool(self):
        manager = ToolManager()
        with pytest.raises(AttributeError):
            manager.add_tool(1)  # type: ignore

    def test_add_lambda(self):
        manager = ToolManager()
        tool = manager.add_tool(lambda x: x, name="my_tool")  # type: ignore[reportUnknownLambdaType]
        assert tool.name == "my_tool"

    def test_add_lambda_with_no_name(self):
        manager = ToolManager()
        with pytest.raises(ValueError, match="You must provide a name for lambda functions"):
            manager.add_tool(lambda x: x)  # type: ignore[reportUnknownLambdaType]

    def test_warn_on_duplicate_tools(self, caplog: pytest.LogCaptureFixture):
        """Test warning on duplicate tools."""

        def f(x: int) -> int:  # pragma: no cover
            return x

        manager = ToolManager()
        manager.add_tool(f)
        with caplog.at_level(logging.WARNING):
            manager.add_tool(f)
            assert "Tool already exists: f" in caplog.text

    def test_disable_warn_on_duplicate_tools(self, caplog: pytest.LogCaptureFixture):
        """Test disabling warning on duplicate tools."""

        def f(x: int) -> int:  # pragma: no cover
            return x

        manager = ToolManager()
        manager.add_tool(f)
        manager.warn_on_duplicate_tools = False
        with caplog.at_level(logging.WARNING):
            manager.add_tool(f)
            assert "Tool already exists: f" not in caplog.text


class TestCallTools:
    @pytest.mark.anyio
    async def test_call_tool(self):
        def sum(a: int, b: int) -> int:
            """Add two numbers."""
            return a + b

        manager = ToolManager()
        manager.add_tool(sum)
        result = await manager.call_tool("sum", {"a": 1, "b": 2})
        assert result == 3

    @pytest.mark.anyio
    async def test_call_async_tool(self):
        async def double(n: int) -> int:
            """Double a number."""
            return n * 2

        manager = ToolManager()
        manager.add_tool(double)
        result = await manager.call_tool("double", {"n": 5})
        assert result == 10

    @pytest.mark.anyio
    async def test_call_object_tool(self):
        class MyTool:
            def __init__(self):
                self.__name__ = "MyTool"

            def __call__(self, x: int) -> int:
                return x * 2

        manager = ToolManager()
        tool = manager.add_tool(MyTool())
        result = await tool.run({"x": 5})
        assert result == 10

    @pytest.mark.anyio
    async def test_call_async_object_tool(self):
        class MyAsyncTool:
            def __init__(self):
                self.__name__ = "MyAsyncTool"

            async def __call__(self, x: int) -> int:
                return x * 2

        manager = ToolManager()
        tool = manager.add_tool(MyAsyncTool())
        result = await tool.run({"x": 5})
        assert result == 10

    @pytest.mark.anyio
    async def test_call_tool_with_default_args(self):
        def sum(a: int, b: int = 1) -> int:
            """Add two numbers."""
            return a + b

        manager = ToolManager()
        manager.add_tool(sum)
        result = await manager.call_tool("sum", {"a": 1})
        assert result == 2

    @pytest.mark.anyio
    async def test_call_tool_with_missing_args(self):
        def sum(a: int, b: int) -> int:  # pragma: no cover
            """Add two numbers."""
            return a + b

        manager = ToolManager()
        manager.add_tool(sum)
        with pytest.raises(ToolError):
            await manager.call_tool("sum", {"a": 1})

    @pytest.mark.anyio
    async def test_call_unknown_tool(self):
        manager = ToolManager()
        with pytest.raises(ToolError):
            await manager.call_tool("unknown", {"a": 1})

    @pytest.mark.anyio
    async def test_call_tool_with_list_int_input(self):
        def sum_vals(vals: list[int]) -> int:
            return sum(vals)

        manager = ToolManager()
        manager.add_tool(sum_vals)
        # Try both with plain list and with JSON list
        result = await manager.call_tool("sum_vals", {"vals": "[1, 2, 3]"})
        assert result == 6
        result = await manager.call_tool("sum_vals", {"vals": [1, 2, 3]})
        assert result == 6

    @pytest.mark.anyio
    async def test_call_tool_with_list_str_or_str_input(self):
        def concat_strs(vals: list[str] | str) -> str:
            return vals if isinstance(vals, str) else "".join(vals)

        manager = ToolManager()
        manager.add_tool(concat_strs)
        # Try both with plain python object and with JSON list
        result = await manager.call_tool("concat_strs", {"vals": ["a", "b", "c"]})
        assert result == "abc"
        result = await manager.call_tool("concat_strs", {"vals": '["a", "b", "c"]'})
        assert result == "abc"
        result = await manager.call_tool("concat_strs", {"vals": "a"})
        assert result == "a"
        result = await manager.call_tool("concat_strs", {"vals": '"a"'})
        assert result == '"a"'

    @pytest.mark.anyio
    async def test_call_tool_with_complex_model(self):
        class MyShrimpTank(BaseModel):
            class Shrimp(BaseModel):
                name: str

            shrimp: list[Shrimp]
            x: None

        def name_shrimp(tank: MyShrimpTank, ctx: Context[ServerSessionT, None]) -> list[str]:
            return [x.name for x in tank.shrimp]

        manager = ToolManager()
        manager.add_tool(name_shrimp)
        result = await manager.call_tool(
            "name_shrimp",
            {"tank": {"x": None, "shrimp": [{"name": "rex"}, {"name": "gertrude"}]}},
        )
        assert result == ["rex", "gertrude"]
        result = await manager.call_tool(
            "name_shrimp",
            {"tank": '{"x": null, "shrimp": [{"name": "rex"}, {"name": "gertrude"}]}'},
        )
        assert result == ["rex", "gertrude"]


class TestToolSchema:
    @pytest.mark.anyio
    async def test_context_arg_excluded_from_schema(self):
        def something(a: int, ctx: Context[ServerSessionT, None]) -> int:  # pragma: no cover
            return a

        manager = ToolManager()
        tool = manager.add_tool(something)
        assert "ctx" not in json.dumps(tool.parameters)
        assert "Context" not in json.dumps(tool.parameters)
        assert "ctx" not in tool.fn_metadata.arg_model.model_fields


class TestContextHandling:
    """Test context handling in the tool manager."""

    def test_context_parameter_detection(self):
        """Test that context parameters are properly detected in
        Tool.from_function()."""

        def tool_with_context(x: int, ctx: Context[ServerSessionT, None]) -> str:  # pragma: no cover
            return str(x)

        manager = ToolManager()
        tool = manager.add_tool(tool_with_context)
        assert tool.context_kwarg == "ctx"

        def tool_without_context(x: int) -> str:  # pragma: no cover
            return str(x)

        tool = manager.add_tool(tool_without_context)
        assert tool.context_kwarg is None

        def tool_with_parametrized_context(
            x: int, ctx: Context[ServerSessionT, LifespanContextT, RequestT]
        ) -> str:  # pragma: no cover
            return str(x)

        tool = manager.add_tool(tool_with_parametrized_context)
        assert tool.context_kwarg == "ctx"

    @pytest.mark.anyio
    async def test_context_injection(self):
        """Test that context is properly injected during tool execution."""

        def tool_with_context(x: int, ctx: Context[ServerSessionT, None]) -> str:
            assert isinstance(ctx, Context)
            return str(x)

        manager = ToolManager()
        manager.add_tool(tool_with_context)

        mcp = MCPServer()
        ctx = mcp.get_context()
        result = await manager.call_tool("tool_with_context", {"x": 42}, context=ctx)
        assert result == "42"

    @pytest.mark.anyio
    async def test_context_injection_async(self):
        """Test that context is properly injected in async tools."""

        async def async_tool(x: int, ctx: Context[ServerSessionT, None]) -> str:
            assert isinstance(ctx, Context)
            return str(x)

        manager = ToolManager()
        manager.add_tool(async_tool)

        mcp = MCPServer()
        ctx = mcp.get_context()
        result = await manager.call_tool("async_tool", {"x": 42}, context=ctx)
        assert result == "42"

    @pytest.mark.anyio
    async def test_context_optional(self):
        """Test that context is optional when calling tools."""

        def tool_with_context(x: int, ctx: Context[ServerSessionT, None] | None = None) -> str:
            return str(x)

        manager = ToolManager()
        manager.add_tool(tool_with_context)
        # Should not raise an error when context is not provided
        result = await manager.call_tool("tool_with_context", {"x": 42})
        assert result == "42"

    @pytest.mark.anyio
    async def test_context_error_handling(self):
        """Test error handling when context injection fails."""

        def tool_with_context(x: int, ctx: Context[ServerSessionT, None]) -> str:
            raise ValueError("Test error")

        manager = ToolManager()
        manager.add_tool(tool_with_context)

        mcp = MCPServer()
        ctx = mcp.get_context()
        with pytest.raises(ToolError, match="Error executing tool tool_with_context"):
            await manager.call_tool("tool_with_context", {"x": 42}, context=ctx)


class TestToolAnnotations:
    def test_tool_annotations(self):
        """Test that tool annotations are correctly added to tools."""

        def read_data(path: str) -> str:  # pragma: no cover
            """Read data from a file."""
            return f"Data from {path}"

        annotations = ToolAnnotations(
            title="File Reader",
            read_only_hint=True,
            open_world_hint=False,
        )

        manager = ToolManager()
        tool = manager.add_tool(read_data, annotations=annotations)

        assert tool.annotations is not None
        assert tool.annotations.title == "File Reader"
        assert tool.annotations.read_only_hint is True
        assert tool.annotations.open_world_hint is False

    @pytest.mark.anyio
    async def test_tool_annotations_in_mcpserver(self):
        """Test that tool annotations are included in MCPTool conversion."""

        app = MCPServer()

        @app.tool(annotations=ToolAnnotations(title="Echo Tool", read_only_hint=True))
        def echo(message: str) -> str:  # pragma: no cover
            """Echo a message back."""
            return message

        tools = await app.list_tools()
        assert len(tools) == 1
        assert tools[0].annotations is not None
        assert tools[0].annotations.title == "Echo Tool"
        assert tools[0].annotations.read_only_hint is True


class TestStructuredOutput:
    """Test structured output functionality in tools."""

    @pytest.mark.anyio
    async def test_tool_with_basemodel_output(self):
        """Test tool with BaseModel return type."""

        class UserOutput(BaseModel):
            name: str
            age: int

        def get_user(user_id: int) -> UserOutput:
            """Get user by ID."""
            return UserOutput(name="John", age=30)

        manager = ToolManager()
        manager.add_tool(get_user)
        result = await manager.call_tool("get_user", {"user_id": 1}, convert_result=True)
        # don't test unstructured output here, just the structured conversion
        assert len(result) == 2 and result[1] == {"name": "John", "age": 30}

    @pytest.mark.anyio
    async def test_tool_with_primitive_output(self):
        """Test tool with primitive return type."""

        def double_number(n: int) -> int:
            """Double a number."""
            return 10

        manager = ToolManager()
        manager.add_tool(double_number)
        result = await manager.call_tool("double_number", {"n": 5})
        assert result == 10
        result = await manager.call_tool("double_number", {"n": 5}, convert_result=True)
        assert isinstance(result[0][0], TextContent) and result[1] == {"result": 10}

    @pytest.mark.anyio
    async def test_tool_with_typeddict_output(self):
        """Test tool with TypedDict return type."""

        class UserDict(TypedDict):
            name: str
            age: int

        expected_output = {"name": "Alice", "age": 25}

        def get_user_dict(user_id: int) -> UserDict:
            """Get user as dict."""
            return UserDict(name="Alice", age=25)

        manager = ToolManager()
        manager.add_tool(get_user_dict)
        result = await manager.call_tool("get_user_dict", {"user_id": 1})
        assert result == expected_output

    @pytest.mark.anyio
    async def test_tool_with_dataclass_output(self):
        """Test tool with dataclass return type."""

        @dataclass
        class Person:
            name: str
            age: int

        expected_output = {"name": "Bob", "age": 40}

        def get_person() -> Person:
            """Get a person."""
            return Person("Bob", 40)

        manager = ToolManager()
        manager.add_tool(get_person)
        result = await manager.call_tool("get_person", {}, convert_result=True)
        # don't test unstructured output here, just the structured conversion
        assert len(result) == 2 and result[1] == expected_output

    @pytest.mark.anyio
    async def test_tool_with_list_output(self):
        """Test tool with list return type."""

        expected_list = [1, 2, 3, 4, 5]
        expected_output = {"result": expected_list}

        def get_numbers() -> list[int]:
            """Get a list of numbers."""
            return expected_list

        manager = ToolManager()
        manager.add_tool(get_numbers)
        result = await manager.call_tool("get_numbers", {})
        assert result == expected_list
        result = await manager.call_tool("get_numbers", {}, convert_result=True)
        assert isinstance(result[0][0], TextContent) and result[1] == expected_output

    @pytest.mark.anyio
    async def test_tool_without_structured_output(self):
        """Test that tools work normally when structured_output=False."""

        def get_dict() -> dict[str, Any]:
            """Get a dict."""
            return {"key": "value"}

        manager = ToolManager()
        manager.add_tool(get_dict, structured_output=False)
        result = await manager.call_tool("get_dict", {})
        assert isinstance(result, dict)
        assert result == {"key": "value"}

    def test_tool_output_schema_property(self):
        """Test that Tool.output_schema property works correctly."""

        class UserOutput(BaseModel):
            name: str
            age: int

        def get_user() -> UserOutput:  # pragma: no cover
            return UserOutput(name="Test", age=25)

        manager = ToolManager()
        tool = manager.add_tool(get_user)

        # Test that output_schema is populated
        expected_schema = {
            "properties": {"name": {"type": "string", "title": "Name"}, "age": {"type": "integer", "title": "Age"}},
            "required": ["name", "age"],
            "title": "UserOutput",
            "type": "object",
        }
        assert tool.output_schema == expected_schema

    @pytest.mark.anyio
    async def test_tool_with_dict_str_any_output(self):
        """Test tool with dict[str, Any] return type."""

        def get_config() -> dict[str, Any]:
            """Get configuration"""
            return {"debug": True, "port": 8080, "features": ["auth", "logging"]}

        manager = ToolManager()
        tool = manager.add_tool(get_config)

        # Check output schema
        assert tool.output_schema is not None
        assert tool.output_schema["type"] == "object"
        assert "properties" not in tool.output_schema  # dict[str, Any] has no constraints

        # Test raw result
        result = await manager.call_tool("get_config", {})
        expected = {"debug": True, "port": 8080, "features": ["auth", "logging"]}
        assert result == expected

        # Test converted result
        result = await manager.call_tool("get_config", {})
        assert result == expected

    @pytest.mark.anyio
    async def test_tool_with_dict_str_typed_output(self):
        """Test tool with dict[str, T] return type for specific T."""

        def get_scores() -> dict[str, int]:
            """Get player scores"""
            return {"alice": 100, "bob": 85, "charlie": 92}

        manager = ToolManager()
        tool = manager.add_tool(get_scores)

        # Check output schema
        assert tool.output_schema is not None
        assert tool.output_schema["type"] == "object"
        assert tool.output_schema["additionalProperties"]["type"] == "integer"

        # Test raw result
        result = await manager.call_tool("get_scores", {})
        expected = {"alice": 100, "bob": 85, "charlie": 92}
        assert result == expected

        # Test converted result
        result = await manager.call_tool("get_scores", {})
        assert result == expected


class TestToolMetadata:
    """Test tool metadata functionality."""

    def test_add_tool_with_metadata(self):
        """Test adding a tool with metadata via ToolManager."""

        def process_data(input_data: str) -> str:  # pragma: no cover
            """Process some data."""
            return f"Processed: {input_data}"

        metadata = {"ui": {"type": "form", "fields": ["input"]}, "version": "1.0"}

        manager = ToolManager()
        tool = manager.add_tool(process_data, meta=metadata)

        assert tool.meta is not None
        assert tool.meta == metadata
        assert tool.meta["ui"]["type"] == "form"
        assert tool.meta["version"] == "1.0"

    def test_add_tool_without_metadata(self):
        """Test that tools without metadata have None as meta value."""

        def simple_tool(x: int) -> int:  # pragma: no cover
            """Simple tool."""
            return x * 2

        manager = ToolManager()
        tool = manager.add_tool(simple_tool)

        assert tool.meta is None

    @pytest.mark.anyio
    async def test_metadata_in_mcpserver_decorator(self):
        """Test that metadata is correctly added via MCPServer.tool decorator."""

        app = MCPServer()

        metadata = {"client": {"ui_component": "file_picker"}, "priority": "high"}

        @app.tool(meta=metadata)
        def upload_file(filename: str) -> str:  # pragma: no cover
            """Upload a file."""
            return f"Uploaded: {filename}"

        # Get the tool from the tool manager
        tool = app._tool_manager.get_tool("upload_file")
        assert tool is not None
        assert tool.meta is not None
        assert tool.meta == metadata
        assert tool.meta["client"]["ui_component"] == "file_picker"
        assert tool.meta["priority"] == "high"

    @pytest.mark.anyio
    async def test_metadata_in_list_tools(self):
        """Test that metadata is included in MCPTool when listing tools."""

        app = MCPServer()

        metadata = {
            "ui": {"input_type": "textarea", "rows": 5},
            "tags": ["text", "processing"],
        }

        @app.tool(meta=metadata)
        def analyze_text(text: str) -> dict[str, Any]:  # pragma: no cover
            """Analyze text content."""
            return {"length": len(text), "words": len(text.split())}

        tools = await app.list_tools()
        assert len(tools) == 1
        assert tools[0].meta is not None
        assert tools[0].meta == metadata

    @pytest.mark.anyio
    async def test_multiple_tools_with_different_metadata(self):
        """Test multiple tools with different metadata values."""

        app = MCPServer()

        metadata1 = {"ui": "form", "version": 1}
        metadata2 = {"ui": "picker", "experimental": True}

        @app.tool(meta=metadata1)
        def tool1(x: int) -> int:  # pragma: no cover
            """First tool."""
            return x

        @app.tool(meta=metadata2)
        def tool2(y: str) -> str:  # pragma: no cover
            """Second tool."""
            return y

        @app.tool()
        def tool3(z: bool) -> bool:  # pragma: no cover
            """Third tool without metadata."""
            return z

        tools = await app.list_tools()
        assert len(tools) == 3

        # Find tools by name and check metadata
        tools_by_name = {t.name: t for t in tools}

        assert tools_by_name["tool1"].meta == metadata1
        assert tools_by_name["tool2"].meta == metadata2
        assert tools_by_name["tool3"].meta is None

    def test_metadata_with_complex_structure(self):
        """Test metadata with complex nested structures."""

        def complex_tool(data: str) -> str:  # pragma: no cover
            """Tool with complex metadata."""
            return data

        metadata = {
            "ui": {
                "components": [
                    {"type": "input", "name": "field1", "validation": {"required": True, "minLength": 5}},
                    {"type": "select", "name": "field2", "options": ["a", "b", "c"]},
                ],
                "layout": {"columns": 2, "responsive": True},
            },
            "permissions": ["read", "write"],
            "tags": ["data-processing", "user-input"],
            "version": 2,
        }

        manager = ToolManager()
        tool = manager.add_tool(complex_tool, meta=metadata)

        assert tool.meta is not None
        assert tool.meta["ui"]["components"][0]["validation"]["minLength"] == 5
        assert tool.meta["ui"]["layout"]["columns"] == 2
        assert "read" in tool.meta["permissions"]
        assert "data-processing" in tool.meta["tags"]

    def test_metadata_empty_dict(self):
        """Test that empty dict metadata is preserved."""

        def tool_with_empty_meta(x: int) -> int:  # pragma: no cover
            """Tool with empty metadata."""
            return x

        manager = ToolManager()
        tool = manager.add_tool(tool_with_empty_meta, meta={})

        assert tool.meta is not None
        assert tool.meta == {}

    @pytest.mark.anyio
    async def test_metadata_with_annotations(self):
        """Test that metadata and annotations can coexist."""

        app = MCPServer()

        metadata = {"custom": "value"}
        annotations = ToolAnnotations(title="Combined Tool", read_only_hint=True)

        @app.tool(meta=metadata, annotations=annotations)
        def combined_tool(data: str) -> str:  # pragma: no cover
            """Tool with both metadata and annotations."""
            return data

        tools = await app.list_tools()
        assert len(tools) == 1
        assert tools[0].meta == metadata
        assert tools[0].annotations is not None
        assert tools[0].annotations.title == "Combined Tool"
        assert tools[0].annotations.read_only_hint is True


class TestRemoveTools:
    """Test tool removal functionality in the tool manager."""

    def test_remove_existing_tool(self):
        """Test removing an existing tool."""

        def add(a: int, b: int) -> int:  # pragma: no cover
            """Add two numbers."""
            return a + b

        manager = ToolManager()
        manager.add_tool(add)

        # Verify tool exists
        assert manager.get_tool("add") is not None
        assert len(manager.list_tools()) == 1

        # Remove the tool - should not raise any exception
        manager.remove_tool("add")

        # Verify tool is removed
        assert manager.get_tool("add") is None
        assert len(manager.list_tools()) == 0

    def test_remove_nonexistent_tool(self):
        """Test removing a non-existent tool raises ToolError."""
        manager = ToolManager()

        with pytest.raises(ToolError, match="Unknown tool: nonexistent"):
            manager.remove_tool("nonexistent")

    def test_remove_tool_from_multiple_tools(self):
        """Test removing one tool when multiple tools exist."""

        def add(a: int, b: int) -> int:  # pragma: no cover
            """Add two numbers."""
            return a + b

        def multiply(a: int, b: int) -> int:  # pragma: no cover
            """Multiply two numbers."""
            return a * b

        def divide(a: int, b: int) -> float:  # pragma: no cover
            """Divide two numbers."""
            return a / b

        manager = ToolManager()
        manager.add_tool(add)
        manager.add_tool(multiply)
        manager.add_tool(divide)

        # Verify all tools exist
        assert len(manager.list_tools()) == 3
        assert manager.get_tool("add") is not None
        assert manager.get_tool("multiply") is not None
        assert manager.get_tool("divide") is not None

        # Remove middle tool
        manager.remove_tool("multiply")

        # Verify only multiply is removed
        assert len(manager.list_tools()) == 2
        assert manager.get_tool("add") is not None
        assert manager.get_tool("multiply") is None
        assert manager.get_tool("divide") is not None

    @pytest.mark.anyio
    async def test_call_removed_tool_raises_error(self):
        """Test that calling a removed tool raises ToolError."""

        def greet(name: str) -> str:
            """Greet someone."""
            return f"Hello, {name}!"

        manager = ToolManager()
        manager.add_tool(greet)

        # Verify tool works before removal
        result = await manager.call_tool("greet", {"name": "World"})
        assert result == "Hello, World!"

        # Remove the tool
        manager.remove_tool("greet")

        # Verify calling removed tool raises error
        with pytest.raises(ToolError, match="Unknown tool: greet"):
            await manager.call_tool("greet", {"name": "World"})

    def test_remove_tool_case_sensitive(self):
        """Test that tool removal is case-sensitive."""

        def test_func() -> str:  # pragma: no cover
            """Test function."""
            return "test"

        manager = ToolManager()
        manager.add_tool(test_func)

        # Verify tool exists
        assert manager.get_tool("test_func") is not None

        # Try to remove with different case - should raise ToolError
        with pytest.raises(ToolError, match="Unknown tool: Test_Func"):
            manager.remove_tool("Test_Func")

        # Verify original tool still exists
        assert manager.get_tool("test_func") is not None

        # Remove with correct case
        manager.remove_tool("test_func")
        assert manager.get_tool("test_func") is None