from __future__ import annotations

import os

from fastapi import Depends, HTTPException
from mcp_common.auth import Principal, TokenStore, require_principal
from mcp_common.environment import EnvironmentInfo
from mcp_common.mcp_bridge import mount_mcp_endpoint
from mcp_common.server import build_app
from pydantic import BaseModel

from mcp_bybit.client import BybitClient
from mcp_bybit.leverage_cap import enforce_leverage as _enforce_leverage
from mcp_bybit.leverage_cap import get_max_leverage


# --- Body models: reads ---

class TickerReq(BaseModel):
    symbol: str
    category: str = "linear"


class TickerBatchReq(BaseModel):
    symbols: list[str]
    category: str = "linear"


class OrderbookReq(BaseModel):
    symbol: str
    category: str = "linear"
    limit: int = 50


class HistoricalReq(BaseModel):
    symbol: str
    category: str = "linear"
    interval: str = "60"
    start: int | None = None
    end: int | None = None
    limit: int = 1000


class IndicatorsReq(BaseModel):
    symbol: str
    category: str = "linear"
    indicators: list[str] = ["rsi", "atr", "macd", "adx"]
    interval: str = "60"
    start: int | None = None
    end: int | None = None


class FundingRateReq(BaseModel):
    symbol: str
    category: str = "linear"


class FundingHistoryReq(BaseModel):
    symbol: str
    category: str = "linear"
    limit: int = 100


class OpenInterestReq(BaseModel):
    symbol: str
    category: str = "linear"
    interval: str = "5min"
    limit: int = 288


class InstrumentsReq(BaseModel):
    category: str = "linear"
    symbol: str | None = None


class OptionChainReq(BaseModel):
    base_coin: str
    expiry: str | None = None


class PositionsReq(BaseModel):
    category: str = "linear"


class AccountSummaryReq(BaseModel):
    pass


class TradeHistoryReq(BaseModel):
    category: str = "linear"
    limit: int = 50


class OpenOrdersReq(BaseModel):
    category: str = "linear"
    symbol: str | None = None


class BasisSpotPerpReq(BaseModel):
    asset: str


# --- Body models: writes ---

class PlaceOrderReq(BaseModel):
    category: str
    symbol: str
    side: str
    qty: float
    order_type: str = "Limit"
    price: float | None = None
    tif: str = "GTC"
    reduce_only: bool = False
    position_idx: int | None = None


class AmendOrderReq(BaseModel):
    category: str
    symbol: str
    order_id: str
    new_qty: float | None = None
    new_price: float | None = None


class CancelOrderReq(BaseModel):
    category: str
    symbol: str
    order_id: str


class CancelAllReq(BaseModel):
    category: str
    symbol: str | None = None


class SetStopLossReq(BaseModel):
    category: str
    symbol: str
    stop_loss: float
    position_idx: int = 0


class SetTakeProfitReq(BaseModel):
    category: str
    symbol: str
    take_profit: float
    position_idx: int = 0


class ClosePositionReq(BaseModel):
    category: str
    symbol: str


class SetLeverageReq(BaseModel):
    category: str
    symbol: str
    leverage: int


class SwitchModeReq(BaseModel):
    category: str
    symbol: str
    mode: str


class TransferReq(BaseModel):
    coin: str
    amount: float
    from_type: str
    to_type: str


# --- ACL helper ---

def _check(principal: Principal, *, core: bool = False, observer: bool = False) -> None:
    allowed: set[str] = set()
    if core:
        allowed.add("core")
    if observer:
        allowed.add("observer")
    if not (principal.capabilities & allowed):
        raise HTTPException(status_code=403, detail="forbidden")


def create_app(
    *,
    client: BybitClient,
    token_store: TokenStore,
    creds: dict | None = None,
    env_info: "EnvironmentInfo | None" = None,
):
    creds = creds or {}
    app = build_app(name="mcp-bybit", version="0.1.0", token_store=token_store)

    # ── Reads ──────────────────────────────────────────────

    @app.post("/tools/environment_info", tags=["reads"])
    async def t_environment_info(principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        if env_info is None:
            return {
                "exchange": "bybit",
                "environment": "testnet" if client.testnet else "mainnet",
                "source": "credentials",
                "env_value": None,
                "base_url": getattr(client, "base_url", None),
                "max_leverage": get_max_leverage(creds),
            }
        return {
            "exchange": env_info.exchange,
            "environment": env_info.environment,
            "source": env_info.source,
            "env_value": env_info.env_value,
            "base_url": env_info.base_url,
            "max_leverage": get_max_leverage(creds),
        }

    @app.post("/tools/get_ticker", tags=["reads"])
    async def t_get_ticker(body: TickerReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_ticker(body.symbol, body.category)

    @app.post("/tools/get_ticker_batch", tags=["reads"])
    async def t_get_ticker_batch(body: TickerBatchReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_ticker_batch(body.symbols, body.category)

    @app.post("/tools/get_orderbook", tags=["reads"])
    async def t_get_orderbook(body: OrderbookReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_orderbook(body.symbol, body.category, body.limit)

    @app.post("/tools/get_historical", tags=["reads"])
    async def t_get_historical(body: HistoricalReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_historical(
            body.symbol, body.category, body.interval, body.start, body.end, body.limit,
        )

    @app.post("/tools/get_indicators", tags=["reads"])
    async def t_get_indicators(body: IndicatorsReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_indicators(
            body.symbol, body.category, body.indicators,
            body.interval, body.start, body.end,
        )

    @app.post("/tools/get_funding_rate", tags=["reads"])
    async def t_get_funding_rate(body: FundingRateReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_funding_rate(body.symbol, body.category)

    @app.post("/tools/get_funding_history", tags=["reads"])
    async def t_get_funding_history(body: FundingHistoryReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_funding_history(body.symbol, body.category, body.limit)

    @app.post("/tools/get_open_interest", tags=["reads"])
    async def t_get_open_interest(body: OpenInterestReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_open_interest(body.symbol, body.category, body.interval, body.limit)

    @app.post("/tools/get_instruments", tags=["reads"])
    async def t_get_instruments(body: InstrumentsReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_instruments(body.category, body.symbol)

    @app.post("/tools/get_option_chain", tags=["reads"])
    async def t_get_option_chain(body: OptionChainReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_option_chain(body.base_coin, body.expiry)

    @app.post("/tools/get_positions", tags=["reads"])
    async def t_get_positions(body: PositionsReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return {"positions": await client.get_positions(body.category)}

    @app.post("/tools/get_account_summary", tags=["reads"])
    async def t_get_account_summary(body: AccountSummaryReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_account_summary()

    @app.post("/tools/get_trade_history", tags=["reads"])
    async def t_get_trade_history(body: TradeHistoryReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return {"trades": await client.get_trade_history(body.category, body.limit)}

    @app.post("/tools/get_open_orders", tags=["reads"])
    async def t_get_open_orders(body: OpenOrdersReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return {"orders": await client.get_open_orders(body.category, body.symbol)}

    @app.post("/tools/get_basis_spot_perp", tags=["reads"])
    async def t_get_basis_spot_perp(body: BasisSpotPerpReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True, observer=True)
        return await client.get_basis_spot_perp(body.asset)

    # ── Writes ─────────────────────────────────────────────

    @app.post("/tools/place_order", tags=["writes"])
    async def t_place_order(body: PlaceOrderReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.place_order(
            body.category, body.symbol, body.side, body.qty,
            body.order_type, body.price, body.tif, body.reduce_only, body.position_idx,
        )

    @app.post("/tools/amend_order", tags=["writes"])
    async def t_amend_order(body: AmendOrderReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.amend_order(
            body.category, body.symbol, body.order_id, body.new_qty, body.new_price,
        )

    @app.post("/tools/cancel_order", tags=["writes"])
    async def t_cancel_order(body: CancelOrderReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.cancel_order(body.category, body.symbol, body.order_id)

    @app.post("/tools/cancel_all_orders", tags=["writes"])
    async def t_cancel_all(body: CancelAllReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.cancel_all_orders(body.category, body.symbol)

    @app.post("/tools/set_stop_loss", tags=["writes"])
    async def t_set_sl(body: SetStopLossReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.set_stop_loss(body.category, body.symbol, body.stop_loss, body.position_idx)

    @app.post("/tools/set_take_profit", tags=["writes"])
    async def t_set_tp(body: SetTakeProfitReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.set_take_profit(body.category, body.symbol, body.take_profit, body.position_idx)

    @app.post("/tools/close_position", tags=["writes"])
    async def t_close(body: ClosePositionReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.close_position(body.category, body.symbol)

    @app.post("/tools/set_leverage", tags=["writes"])
    async def t_set_leverage(body: SetLeverageReq, principal: Principal = Depends(require_principal)):
        _enforce_leverage(body.leverage, creds=creds, exchange="bybit")
        _check(principal, core=True)
        return await client.set_leverage(body.category, body.symbol, body.leverage)

    @app.post("/tools/switch_position_mode", tags=["writes"])
    async def t_switch_mode(body: SwitchModeReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.switch_position_mode(body.category, body.symbol, body.mode)

    @app.post("/tools/transfer_asset", tags=["writes"])
    async def t_transfer(body: TransferReq, principal: Principal = Depends(require_principal)):
        _check(principal, core=True)
        return await client.transfer_asset(body.coin, body.amount, body.from_type, body.to_type)

    # ── MCP mount ──────────────────────────────────────────

    port = int(os.environ.get("PORT", "9019"))
    mount_mcp_endpoint(
        app,
        name="cerbero-bybit",
        version="0.1.0",
        token_store=token_store,
        internal_base_url=f"http://localhost:{port}",
        tools=[
            {"name": "environment_info", "description": "Ambiente operativo (testnet/mainnet), source, base_url, max_leverage cap."},
            {"name": "get_ticker", "description": "Ticker Bybit (spot/linear/inverse/option)."},
            {"name": "get_ticker_batch", "description": "Ticker per più simboli."},
            {"name": "get_orderbook", "description": "Orderbook profondità N."},
            {"name": "get_historical", "description": "OHLCV candles Bybit."},
            {"name": "get_indicators", "description": "Indicatori tecnici (RSI, ATR, MACD, ADX)."},
            {"name": "get_funding_rate", "description": "Funding corrente perp."},
            {"name": "get_funding_history", "description": "Funding storico perp."},
            {"name": "get_open_interest", "description": "Open interest history perp."},
            {"name": "get_instruments", "description": "Specs contratti."},
            {"name": "get_option_chain", "description": "Option chain BTC/ETH/SOL."},
            {"name": "get_positions", "description": "Posizioni aperte."},
            {"name": "get_account_summary", "description": "Wallet balance e margine."},
            {"name": "get_trade_history", "description": "Fills recenti."},
            {"name": "get_open_orders", "description": "Ordini pending."},
            {"name": "get_basis_spot_perp", "description": "Basis spot vs linear perp."},
            {"name": "place_order", "description": "Invia ordine (CORE only)."},
            {"name": "amend_order", "description": "Modifica ordine esistente."},
            {"name": "cancel_order", "description": "Cancella ordine."},
            {"name": "cancel_all_orders", "description": "Cancella tutti ordini."},
            {"name": "set_stop_loss", "description": "Setta stop loss su posizione."},
            {"name": "set_take_profit", "description": "Setta take profit su posizione."},
            {"name": "close_position", "description": "Chiude posizione aperta."},
            {"name": "set_leverage", "description": "Leva buy+sell uniforme."},
            {"name": "switch_position_mode", "description": "Hedge vs one-way."},
            {"name": "transfer_asset", "description": "Trasferimento interno tra account types."},
        ],
    )

    return app