from __future__ import annotations

import logging
import os

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

from mcp_sentiment.fetchers import (
    fetch_cointegration_pairs,
    fetch_cross_exchange_funding,
    fetch_crypto_news,
    fetch_funding_arb_spread,
    fetch_funding_rates,
    fetch_liquidation_heatmap,
    fetch_oi_history,
    fetch_social_sentiment,
    fetch_world_news,
)

logger = logging.getLogger(__name__)

# --- Body models ---

class GetCryptoNewsReq(BaseModel):
    limit: int = 20


class GetSocialSentimentReq(BaseModel):
    symbol: str = "BTC"


class GetFundingRatesReq(BaseModel):
    asset: str = "BTC"


class GetWorldNewsReq(BaseModel):
    pass


class GetCrossExchangeFundingReq(BaseModel):
    assets: list[str] | None = None


class GetFundingArbSpreadReq(BaseModel):
    assets: list[str] | None = None


class GetLiquidationHeatmapReq(BaseModel):
    asset: str = "BTC"


class GetCointegrationPairsReq(BaseModel):
    pairs: list[list[str]] | None = None
    lookback_hours: int = 24


class GetOiHistoryReq(BaseModel):
    asset: str = "BTC"
    period: str = "5m"
    limit: int = 288


# --- 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(403, f"capability required: {allowed}")


# --- App factory ---

def create_app(*, cryptopanic_key: str = "", token_store: TokenStore) -> FastAPI:
    app = build_app(name="mcp-sentiment", version="0.1.0", token_store=token_store)

    if not cryptopanic_key or cryptopanic_key.lower() in ("placeholder", "none", "changeme"):
        logger.warning(
            "mcp-sentiment: cryptopanic_key mancante o placeholder — get_crypto_news "
            "ritornerà headlines=[] con note diagnostica"
        )

    @app.post("/tools/get_crypto_news", tags=["reads"])
    async def t_get_crypto_news(
        body: GetCryptoNewsReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_crypto_news(api_key=cryptopanic_key, limit=body.limit)

    @app.post("/tools/get_social_sentiment", tags=["reads"])
    async def t_get_social_sentiment(
        body: GetSocialSentimentReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_social_sentiment(body.symbol)

    @app.post("/tools/get_funding_rates", tags=["reads"])
    async def t_get_funding_rates(
        body: GetFundingRatesReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_funding_rates(body.asset)

    @app.post("/tools/get_world_news", tags=["reads"])
    async def t_get_world_news(
        body: GetWorldNewsReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_world_news()

    @app.post("/tools/get_cross_exchange_funding", tags=["reads"])
    async def t_get_cross_exchange_funding(
        body: GetCrossExchangeFundingReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_cross_exchange_funding(body.assets)

    @app.post("/tools/get_funding_arb_spread", tags=["reads"])
    async def t_get_funding_arb_spread(
        body: GetFundingArbSpreadReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_funding_arb_spread(body.assets)

    @app.post("/tools/get_liquidation_heatmap", tags=["reads"])
    async def t_get_liquidation_heatmap(
        body: GetLiquidationHeatmapReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_liquidation_heatmap(body.asset)

    @app.post("/tools/get_cointegration_pairs", tags=["reads"])
    async def t_get_cointegration_pairs(
        body: GetCointegrationPairsReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_cointegration_pairs(body.pairs, body.lookback_hours)

    @app.post("/tools/get_oi_history", tags=["reads"])
    async def t_get_oi_history(
        body: GetOiHistoryReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_oi_history(body.asset, body.period, body.limit)

    # ───── MCP endpoint (/mcp) — bridge verso /tools/* ─────
    port = int(os.environ.get("PORT", "9014"))
    mount_mcp_endpoint(
        app,
        name="cerbero-sentiment",
        version="0.1.0",
        token_store=token_store,
        internal_base_url=f"http://localhost:{port}",
        tools=[
            {"name": "get_crypto_news", "description": "News crypto da CryptoPanic."},
            {"name": "get_social_sentiment", "description": "Sentiment aggregato social."},
            {"name": "get_funding_rates", "description": "Funding rates aggregati."},
            {"name": "get_world_news", "description": "News macro/world."},
            {"name": "get_cross_exchange_funding", "description": "Funding multi-asset multi-exchange + arbitrage opportunities."},
            {"name": "get_oi_history", "description": "Open interest history perp (Binance) + delta_pct 1h/4h/24h."},
            {"name": "get_funding_arb_spread", "description": "Opportunità arbitrage funding cross-exchange in formato compatto + annualized %."},
            {"name": "get_liquidation_heatmap", "description": "Pressione liquidazioni heuristica da OI delta + funding (long/short squeeze risk)."},
            {"name": "get_cointegration_pairs", "description": "Engle-Granger cointegration test su coppie crypto Binance hourly."},
        ],
    )

    return app