"""Tool deribit V2: pydantic schemas + async functions.

Ogni funzione prende (client: DeribitClient, params: <Req>) e restituisce
un dict (o un model Pydantic). Pure logica, no FastAPI dependency, no ACL.
L'autenticazione bearer è gestita dal middleware in cerbero_mcp.auth;
l'audit verrà cablato dal router via request.state.environment.
"""
from __future__ import annotations

import contextlib
from typing import Any

from pydantic import BaseModel, field_validator, model_validator

from cerbero_mcp.exchanges.deribit.client import DeribitClient
from cerbero_mcp.exchanges.deribit.leverage_cap import (
    enforce_leverage as _enforce_leverage,
)
from cerbero_mcp.exchanges.deribit.leverage_cap import get_max_leverage

# === Schemas ===


class GetTickerReq(BaseModel):
    instrument_name: str | None = None
    instrument: str | None = None

    model_config = {"extra": "allow"}

    @model_validator(mode="after")
    def _normalize(self):
        sym = self.instrument_name or self.instrument
        if not sym:
            raise ValueError("instrument_name (or instrument) is required")
        self.instrument_name = sym
        return self


class GetTickerBatchReq(BaseModel):
    instrument_names: list[str] | None = None
    instruments: list[str] | None = None

    model_config = {"extra": "allow"}

    @model_validator(mode="after")
    def _normalize(self):
        names = self.instrument_names or self.instruments
        if not names:
            raise ValueError("instrument_names (or instruments) is required")
        self.instrument_names = names
        return self


class GetInstrumentsReq(BaseModel):
    currency: str
    kind: str | None = None
    expiry_from: str | None = None
    expiry_to: str | None = None
    strike_min: float | None = None
    strike_max: float | None = None
    min_open_interest: float | None = None
    limit: int = 100
    offset: int = 0


class GetOrderbookReq(BaseModel):
    instrument_name: str
    depth: int = 10


class OrderbookImbalanceReq(BaseModel):
    instrument_name: str
    depth: int = 10


class GetPositionsReq(BaseModel):
    currency: str = "USDC"


class GetAccountSummaryReq(BaseModel):
    currency: str = "USDC"


class GetTradeHistoryReq(BaseModel):
    limit: int = 100
    instrument_name: str | None = None


class GetHistoricalReq(BaseModel):
    instrument: str
    start_date: str
    end_date: str
    resolution: str = "1h"


class GetDvolReq(BaseModel):
    currency: str = "BTC"
    start_date: str
    end_date: str
    resolution: str = "1D"


class GetDvolHistoryReq(BaseModel):
    currency: str = "BTC"
    lookback_days: int = 90


class GetIvRankReq(BaseModel):
    instrument: str


class GetRealizedVolReq(BaseModel):
    currency: str = "BTC"
    windows: list[int] = [14, 30]


class GetGexReq(BaseModel):
    currency: str
    expiry_from: str | None = None
    expiry_to: str | None = None
    top_n_strikes: int = 50


class OptionFlowReq(BaseModel):
    """Body comune per indicatori option-flow (dealer gamma, vanna/charm,
    OI-weighted skew, smile asymmetry, ATM vs wings)."""

    currency: str
    expiry_from: str | None = None
    expiry_to: str | None = None
    top_n_strikes: int = 100


class GetPcRatioReq(BaseModel):
    currency: str


class GetSkew25dReq(BaseModel):
    currency: str
    expiry: str


class GetTermStructureReq(BaseModel):
    currency: str


class CalculateSpreadPayoffReq(BaseModel):
    legs: list[dict]
    quote_currency: str = "USD"


class RunBacktestReq(BaseModel):
    strategy_name: str
    underlying: str = "BTC"
    lookback_days: int = 30
    resolution: str = "4h"
    entry_rules: dict | None = None
    exit_rules: dict | None = None


class FindByDeltaReq(BaseModel):
    currency: str
    expiry: str
    target_delta: float
    option_type: str
    max_results: int = 3
    min_open_interest: float = 100.0
    min_volume_24h: float = 20.0


class GetIndicatorsReq(BaseModel):
    instrument: str
    indicators: list[str]
    start_date: str
    end_date: str
    resolution: str = "1h"

    @field_validator("indicators", mode="before")
    @classmethod
    def _coerce_indicators(cls, v):
        if isinstance(v, str):
            import json

            s = v.strip()
            if s.startswith("["):
                try:
                    parsed = json.loads(s)
                    if isinstance(parsed, list):
                        return [str(x).strip() for x in parsed if str(x).strip()]
                except json.JSONDecodeError:
                    pass
            return [x.strip() for x in s.split(",") if x.strip()]
        if isinstance(v, list):
            return v
        raise ValueError(
            "indicators must be a list like ['rsi','atr','macd'] "
            "or a comma-separated string like 'rsi,atr,macd'"
        )


class PlaceOrderReq(BaseModel):
    instrument_name: str
    side: str  # "buy" | "sell"
    amount: float
    type: str = "limit"
    price: float | None = None
    reduce_only: bool = False
    post_only: bool = False
    label: str | None = None
    leverage: int | None = None  # CER-016: None → default cap (3x)

    model_config = {
        "json_schema_extra": {
            "examples": [
                {
                    "summary": "Market buy 0.1 BTC perpetual",
                    "value": {
                        "instrument_name": "BTC-PERPETUAL",
                        "type": "market",
                        "amount": 0.1,
                        "side": "buy",
                    },
                }
            ]
        }
    }


class ComboLeg(BaseModel):
    instrument_name: str
    direction: str  # "buy" | "sell"
    ratio: int = 1


class PlaceComboOrderReq(BaseModel):
    legs: list[ComboLeg]
    side: str  # "buy" | "sell"
    amount: float
    type: str = "limit"
    price: float | None = None
    label: str | None = None
    leverage: int | None = None

    @model_validator(mode="after")
    def _at_least_two_legs(self):
        if len(self.legs) < 2:
            raise ValueError("combo requires at least 2 legs")
        return self


class CancelOrderReq(BaseModel):
    order_id: str


class SetStopLossReq(BaseModel):
    order_id: str
    stop_price: float


class SetTakeProfitReq(BaseModel):
    order_id: str
    tp_price: float


class ClosePositionReq(BaseModel):
    instrument_name: str


# === Tools (reads) ===


async def is_testnet(client: DeribitClient) -> dict:
    return client.is_testnet()


async def environment_info(
    client: DeribitClient, *, creds: dict, env_info: Any | None = None
) -> dict:
    if env_info is None:
        return {
            "exchange": "deribit",
            "environment": "testnet" if client.is_testnet().get("testnet") else "mainnet",
            "source": "credentials",
            "env_value": None,
            "base_url": client.base_url,
            "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),
    }


async def get_ticker(client: DeribitClient, params: GetTickerReq) -> dict:
    assert params.instrument_name is not None  # validator garantisce non-None
    return await client.get_ticker(params.instrument_name)


async def get_ticker_batch(client: DeribitClient, params: GetTickerBatchReq) -> dict:
    assert params.instrument_names is not None  # validator garantisce non-None
    return await client.get_ticker_batch(params.instrument_names)


async def get_instruments(client: DeribitClient, params: GetInstrumentsReq) -> dict:
    return await client.get_instruments(
        currency=params.currency,
        kind=params.kind,
        expiry_from=params.expiry_from,
        expiry_to=params.expiry_to,
        strike_min=params.strike_min,
        strike_max=params.strike_max,
        min_open_interest=params.min_open_interest,
        limit=params.limit,
        offset=params.offset,
    )


async def get_orderbook(client: DeribitClient, params: GetOrderbookReq) -> dict:
    return await client.get_orderbook(params.instrument_name, params.depth)


async def get_orderbook_imbalance(
    client: DeribitClient, params: OrderbookImbalanceReq
) -> dict:
    return await client.get_orderbook_imbalance(params.instrument_name, params.depth)


async def get_positions(client: DeribitClient, params: GetPositionsReq) -> list:
    return await client.get_positions(params.currency)


async def get_account_summary(
    client: DeribitClient, params: GetAccountSummaryReq
) -> dict:
    return await client.get_account_summary(params.currency)


async def get_trade_history(client: DeribitClient, params: GetTradeHistoryReq) -> list:
    return await client.get_trade_history(params.limit, params.instrument_name)


async def get_historical(client: DeribitClient, params: GetHistoricalReq) -> dict:
    return await client.get_historical(
        params.instrument, params.start_date, params.end_date, params.resolution
    )


async def get_dvol(client: DeribitClient, params: GetDvolReq) -> dict:
    return await client.get_dvol(
        params.currency, params.start_date, params.end_date, params.resolution
    )


async def get_gex(client: DeribitClient, params: GetGexReq) -> dict:
    return await client.get_gex(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_dealer_gamma_profile(
    client: DeribitClient, params: OptionFlowReq
) -> dict:
    return await client.get_dealer_gamma_profile(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_vanna_charm(client: DeribitClient, params: OptionFlowReq) -> dict:
    return await client.get_vanna_charm(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_oi_weighted_skew(client: DeribitClient, params: OptionFlowReq) -> dict:
    return await client.get_oi_weighted_skew(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_smile_asymmetry(client: DeribitClient, params: OptionFlowReq) -> dict:
    return await client.get_smile_asymmetry(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_atm_vs_wings_vol(client: DeribitClient, params: OptionFlowReq) -> dict:
    return await client.get_atm_vs_wings_vol(
        params.currency, params.expiry_from, params.expiry_to, params.top_n_strikes
    )


async def get_pc_ratio(client: DeribitClient, params: GetPcRatioReq) -> dict:
    return await client.get_pc_ratio(params.currency)


async def get_skew_25d(client: DeribitClient, params: GetSkew25dReq) -> dict:
    return await client.get_skew_25d(params.currency, params.expiry)


async def get_term_structure(
    client: DeribitClient, params: GetTermStructureReq
) -> dict:
    return await client.get_term_structure(params.currency)


async def run_backtest(client: DeribitClient, params: RunBacktestReq) -> dict:
    return await client.run_backtest(
        strategy_name=params.strategy_name,
        underlying=params.underlying,
        lookback_days=params.lookback_days,
        resolution=params.resolution,
        entry_rules=params.entry_rules,
        exit_rules=params.exit_rules,
    )


async def calculate_spread_payoff(
    client: DeribitClient, params: CalculateSpreadPayoffReq
) -> dict:
    return await client.calculate_spread_payoff(params.legs, params.quote_currency)


async def find_by_delta(client: DeribitClient, params: FindByDeltaReq) -> dict:
    return await client.find_by_delta(
        currency=params.currency,
        expiry=params.expiry,
        target_delta=params.target_delta,
        option_type=params.option_type,
        max_results=params.max_results,
        min_open_interest=params.min_open_interest,
        min_volume_24h=params.min_volume_24h,
    )


async def get_iv_rank(client: DeribitClient, params: GetIvRankReq) -> dict:
    return await client.get_iv_rank(params.instrument)


async def get_dvol_history(client: DeribitClient, params: GetDvolHistoryReq) -> dict:
    return await client.get_dvol_history(params.currency, params.lookback_days)


async def get_realized_vol(client: DeribitClient, params: GetRealizedVolReq) -> dict:
    return await client.get_realized_vol(params.currency, params.windows)


async def get_technical_indicators(
    client: DeribitClient, params: GetIndicatorsReq
) -> dict:
    return await client.get_technical_indicators(
        params.instrument,
        params.indicators,
        params.start_date,
        params.end_date,
        params.resolution,
    )


# === Tools (writes) ===


async def place_order(
    client: DeribitClient, params: PlaceOrderReq, *, creds: dict
) -> dict:
    cap_default = get_max_leverage(creds)
    lev = _enforce_leverage(params.leverage, creds=creds, exchange="deribit")
    if lev != cap_default:
        with contextlib.suppress(Exception):
            await client.set_leverage(params.instrument_name, lev)
    result = await client.place_order(
        instrument_name=params.instrument_name,
        side=params.side,
        amount=params.amount,
        type=params.type,
        price=params.price,
        reduce_only=params.reduce_only,
        post_only=params.post_only,
        label=params.label,
    )
    # TODO V2: wire audit via request.state.environment in router
    return result


async def place_combo_order(
    client: DeribitClient, params: PlaceComboOrderReq, *, creds: dict
) -> dict:
    cap_default = get_max_leverage(creds)
    lev = _enforce_leverage(params.leverage, creds=creds, exchange="deribit")
    if lev != cap_default:
        for leg in params.legs:
            with contextlib.suppress(Exception):
                await client.set_leverage(leg.instrument_name, lev)
    result = await client.place_combo_order(
        legs=[leg.model_dump() for leg in params.legs],
        side=params.side,
        amount=params.amount,
        type=params.type,
        price=params.price,
        label=params.label,
    )
    # TODO V2: wire audit via request.state.environment in router
    return result


async def cancel_order(client: DeribitClient, params: CancelOrderReq) -> dict:
    result = await client.cancel_order(params.order_id)
    # TODO V2: wire audit via request.state.environment in router
    return result


async def set_stop_loss(client: DeribitClient, params: SetStopLossReq) -> dict:
    result = await client.set_stop_loss(params.order_id, params.stop_price)
    # TODO V2: wire audit via request.state.environment in router
    return result


async def set_take_profit(client: DeribitClient, params: SetTakeProfitReq) -> dict:
    result = await client.set_take_profit(params.order_id, params.tp_price)
    # TODO V2: wire audit via request.state.environment in router
    return result


async def close_position(client: DeribitClient, params: ClosePositionReq) -> dict:
    result = await client.close_position(params.instrument_name)
    # TODO V2: wire audit via request.state.environment in router
    return result