"""MCP tool wrappers for Beaver's tool contract."""

from __future__ import annotations

import asyncio
from dataclasses import dataclass
import json
from typing import Any, Awaitable, Callable

from beaver.tools.base import BaseTool, ToolContext, ToolResult, ToolSpec


def _tool_schema(tool_def: Any) -> dict[str, Any]:
    schema = getattr(tool_def, "inputSchema", None) or getattr(tool_def, "input_schema", None)
    if isinstance(schema, dict):
        return schema
    return {"type": "object", "properties": {}}


def _tool_name(tool_def: Any) -> str:
    return str(getattr(tool_def, "name", "") or "")


def _tool_description(tool_def: Any) -> str:
    return str(getattr(tool_def, "description", "") or _tool_name(tool_def))


def _mcp_result_to_text(result: Any) -> str:
    parts: list[str] = []
    for block in list(getattr(result, "content", []) or []):
        text = getattr(block, "text", None)
        parts.append(str(text if text is not None else block))
    if not parts and getattr(result, "structuredContent", None) is not None:
        return json.dumps(getattr(result, "structuredContent"), ensure_ascii=False, indent=2)
    return "\n".join(parts) or "(no output)"


@dataclass(slots=True)
class MCPToolWrapper(BaseTool):
    server_id: str
    tool_def: Any
    call_tool: Callable[[str, dict[str, Any]], Awaitable[Any]]
    tool_timeout: int = 30
    sensitive: bool = False
    kind: str = "online"
    category: str = "online"
    display_name: str = ""

    @property
    def original_name(self) -> str:
        return _tool_name(self.tool_def)

    @property
    def spec(self) -> ToolSpec:
        return ToolSpec(
            name=f"mcp_{self.server_id}_{self.original_name}",
            description=_tool_description(self.tool_def),
            input_schema=_tool_schema(self.tool_def),
            toolset=f"mcp-{self.server_id}",
            metadata={
                "server_id": self.server_id,
                "original_tool_name": self.original_name,
                "kind": self.kind,
                "category": self.category,
                "display_name": self.display_name or self.server_id,
                "transport": "mcp",
            },
        )

    async def invoke(self, arguments: dict[str, Any], context: ToolContext) -> ToolResult:
        try:
            result = await asyncio.wait_for(
                self.call_tool(self.original_name, dict(arguments or {})),
                timeout=max(1, int(self.tool_timeout or 30)),
            )
            return ToolResult(
                success=True,
                content=_mcp_result_to_text(result),
                tool_name=self.spec.name,
                raw_output=result,
            )
        except Exception as exc:
            return ToolResult(
                success=False,
                content=f"MCP tool {self.server_id}.{self.original_name} failed: {exc}",
                tool_name=self.spec.name,
                error=str(exc),
            )