"""Router /mcp-alpaca/* — DI per env, client e (write) creds.

Mappa 1:1 i tool di `cerbero_mcp.exchanges.alpaca.tools` a endpoint
`POST /mcp-alpaca/tools/{tool_name}`. L'autenticazione bearer è gestita
dal middleware in `cerbero_mcp.auth`; qui leggiamo solo `request.state.environment`.
"""
from __future__ import annotations

from typing import Literal

from fastapi import APIRouter, Depends, Request

from cerbero_mcp.client_registry import ClientRegistry
from cerbero_mcp.exchanges.alpaca import tools as t
from cerbero_mcp.exchanges.alpaca.client import AlpacaClient

Environment = Literal["testnet", "mainnet"]


def get_environment(request: Request) -> Environment:
    return request.state.environment


async def get_alpaca_client(
    request: Request, env: Environment = Depends(get_environment)
) -> AlpacaClient:
    registry: ClientRegistry = request.app.state.registry
    return await registry.get("alpaca", env)


def _build_creds(request: Request) -> dict:
    """Costruisce dict `creds` minimale per leverage cap / metadata."""
    settings = request.app.state.settings
    return {
        "max_leverage": settings.alpaca.max_leverage,
        "api_key_id": settings.alpaca.api_key_id,
    }


def make_router() -> APIRouter:
    r = APIRouter(prefix="/mcp-alpaca", tags=["alpaca"])

    # === READ tools ===

    @r.post("/tools/environment_info")
    async def _environment_info(
        request: Request,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        creds = _build_creds(request)
        return await t.environment_info(client, creds=creds)

    @r.post("/tools/get_account")
    async def _get_account(
        params: t.GetAccountReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_account(client, params)

    @r.post("/tools/get_positions")
    async def _get_positions(
        params: t.GetPositionsReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_positions(client, params)

    @r.post("/tools/get_activities")
    async def _get_activities(
        params: t.GetActivitiesReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_activities(client, params)

    @r.post("/tools/get_assets")
    async def _get_assets(
        params: t.GetAssetsReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_assets(client, params)

    @r.post("/tools/get_ticker")
    async def _get_ticker(
        params: t.GetTickerReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_ticker(client, params)

    @r.post("/tools/get_bars")
    async def _get_bars(
        params: t.GetBarsReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_bars(client, params)

    @r.post("/tools/get_snapshot")
    async def _get_snapshot(
        params: t.GetSnapshotReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_snapshot(client, params)

    @r.post("/tools/get_option_chain")
    async def _get_option_chain(
        params: t.GetOptionChainReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_option_chain(client, params)

    @r.post("/tools/get_open_orders")
    async def _get_open_orders(
        params: t.GetOpenOrdersReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_open_orders(client, params)

    @r.post("/tools/get_clock")
    async def _get_clock(
        params: t.GetClockReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_clock(client, params)

    @r.post("/tools/get_calendar")
    async def _get_calendar(
        params: t.GetCalendarReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.get_calendar(client, params)

    # === WRITE tools ===

    @r.post("/tools/place_order")
    async def _place_order(
        params: t.PlaceOrderReq,
        request: Request,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        creds = _build_creds(request)
        return await t.place_order(client, params, creds=creds)

    @r.post("/tools/amend_order")
    async def _amend_order(
        params: t.AmendOrderReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.amend_order(client, params)

    @r.post("/tools/cancel_order")
    async def _cancel_order(
        params: t.CancelOrderReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.cancel_order(client, params)

    @r.post("/tools/cancel_all_orders")
    async def _cancel_all_orders(
        params: t.CancelAllOrdersReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.cancel_all_orders(client, params)

    @r.post("/tools/close_position")
    async def _close_position(
        params: t.ClosePositionReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.close_position(client, params)

    @r.post("/tools/close_all_positions")
    async def _close_all_positions(
        params: t.CloseAllPositionsReq,
        client: AlpacaClient = Depends(get_alpaca_client),
    ):
        return await t.close_all_positions(client, params)

    return r