import importlib
from fastapi import FastAPI, HTTPException
from registry import TOOLS, BY_NAME

app = FastAPI(title="XTOOLS", description="90two tool server")

_registry_cache = {}


def _load(tool_name: str):
    if tool_name not in _registry_cache:
        mod = importlib.import_module(f"tools.{tool_name}")
        _registry_cache[tool_name] = mod.run
    return _registry_cache[tool_name]


def _validate(tool_name: str, params: dict) -> dict:
    spec = BY_NAME[tool_name]
    cleaned = {}
    for p in spec["params"]:
        name = p["name"]
        if name in params:
            cleaned[name] = params[name]
        elif p["required"]:
            raise HTTPException(status_code=422, detail=f"Missing required param: {name}")
        else:
            cleaned[name] = p["default"]
    return cleaned


@app.get("/")
def health():
    return {"status": "ok", "tool_count": len(TOOLS)}


@app.get("/registry")
def get_registry():
    """Full tool manifest -- name, category, auth type, and param schema for every tool."""
    return {"tools": TOOLS}


@app.post("/tools/{tool_name}")
def call_tool(tool_name: str, params: dict = None):
    if tool_name not in BY_NAME:
        raise HTTPException(status_code=404, detail=f"Unknown tool: {tool_name}")
    params = params or {}
    cleaned = _validate(tool_name, params)
    run_fn = _load(tool_name)
    try:
        return run_fn(cleaned)
    except ValueError as e:
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"{type(e).__name__}: {e}")