from __future__ import annotations

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, Field

from mcp_macro.fetchers import (
    fetch_asset_price,
    fetch_breakeven_inflation,
    fetch_cot_disaggregated,
    fetch_cot_extreme_positioning,
    fetch_cot_tff,
    fetch_economic_indicators,
    fetch_equity_futures,
    fetch_macro_calendar,
    fetch_market_overview,
    fetch_treasury_yields,
    fetch_yield_curve_slope,
)

# --- Body models ---

class GetEconomicIndicatorsReq(BaseModel):
    indicators: list[str] | None = None


class GetMacroCalendarReq(BaseModel):
    days: int = 7
    country_filter: list[str] | None = None
    importance_min: str | None = None
    start: str | None = None
    end: str | None = None


class GetMarketOverviewReq(BaseModel):
    pass


class GetAssetPriceReq(BaseModel):
    ticker: str


class GetTreasuryYieldsReq(BaseModel):
    pass


class GetEquityFuturesReq(BaseModel):
    pass


class GetYieldCurveSlopeReq(BaseModel):
    pass


class GetBreakevenInflationReq(BaseModel):
    pass


class GetCotTffReq(BaseModel):
    symbol: str
    lookback_weeks: int = Field(default=52, ge=4, le=520)


class GetCotDisaggregatedReq(BaseModel):
    symbol: str
    lookback_weeks: int = Field(default=52, ge=4, le=520)


class GetCotExtremeReq(BaseModel):
    lookback_weeks: int = Field(default=156, ge=4, le=520)


# --- 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(*, fred_api_key: str = "", finnhub_api_key: str = "", token_store: TokenStore) -> FastAPI:
    app = build_app(name="mcp-macro", version="0.1.0", token_store=token_store)

    @app.post("/tools/get_economic_indicators", tags=["reads"])
    async def t_get_economic_indicators(
        body: GetEconomicIndicatorsReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_economic_indicators(
            fred_api_key=fred_api_key, indicators=body.indicators
        )

    @app.post("/tools/get_macro_calendar", tags=["reads"])
    async def t_get_macro_calendar(
        body: GetMacroCalendarReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_macro_calendar(
            finnhub_api_key=finnhub_api_key,
            days_ahead=body.days,
            country_filter=body.country_filter,
            importance_min=body.importance_min,
            start=body.start,
            end=body.end,
        )

    @app.post("/tools/get_market_overview", tags=["reads"])
    async def t_get_market_overview(
        body: GetMarketOverviewReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_market_overview()

    @app.post("/tools/get_asset_price", tags=["reads"])
    async def t_get_asset_price(
        body: GetAssetPriceReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_asset_price(body.ticker)

    @app.post("/tools/get_treasury_yields", tags=["reads"])
    async def t_get_treasury_yields(
        body: GetTreasuryYieldsReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_treasury_yields()

    @app.post("/tools/get_equity_futures", tags=["reads"])
    async def t_get_equity_futures(
        body: GetEquityFuturesReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_equity_futures()

    @app.post("/tools/get_yield_curve_slope", tags=["reads"])
    async def t_get_yield_curve_slope(
        body: GetYieldCurveSlopeReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_yield_curve_slope()

    @app.post("/tools/get_breakeven_inflation", tags=["reads"])
    async def t_get_breakeven_inflation(
        body: GetBreakevenInflationReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_breakeven_inflation(fred_api_key=fred_api_key)

    @app.post("/tools/get_cot_tff", tags=["reads"])
    async def t_get_cot_tff(
        body: GetCotTffReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_cot_tff(body.symbol, body.lookback_weeks)

    @app.post("/tools/get_cot_disaggregated", tags=["reads"])
    async def t_get_cot_disaggregated(
        body: GetCotDisaggregatedReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_cot_disaggregated(body.symbol, body.lookback_weeks)

    @app.post("/tools/get_cot_extreme_positioning", tags=["reads"])
    async def t_get_cot_extreme(
        body: GetCotExtremeReq, principal: Principal = Depends(require_principal)
    ):
        _check(principal, core=True, observer=True)
        return await fetch_cot_extreme_positioning(body.lookback_weeks)

    # ───── MCP endpoint (/mcp) — bridge verso /tools/* ─────
    port = int(os.environ.get("PORT", "9013"))
    mount_mcp_endpoint(
        app,
        name="cerbero-macro",
        version="0.1.0",
        token_store=token_store,
        internal_base_url=f"http://localhost:{port}",
        tools=[
            {"name": "get_economic_indicators", "description": "FRED economic indicators (Fed rate, CPI, ecc)."},
            {"name": "get_macro_calendar", "description": "Eventi macro con filtri country/importance/date range."},
            {"name": "get_market_overview", "description": "Snapshot overview mercato macro."},
            {"name": "get_asset_price", "description": "Prezzo cross-asset: WTI, DXY, SPX, VIX, yields, FX, ecc."},
            {"name": "get_treasury_yields", "description": "Curva US Treasury 2y/5y/10y/30y + shape detection."},
            {"name": "get_equity_futures", "description": "Futures ES/NQ/YM/RTY con session status."},
            {"name": "get_yield_curve_slope", "description": "Slope 2y10y/5y30y + butterfly + regime (steep/normal/flat/inverted)."},
            {"name": "get_breakeven_inflation", "description": "Breakeven inflation 5Y/10Y + 5y5y forward (FRED T5YIE/T10YIE/T5YIFR)."},
            {"name": "get_cot_tff", "description": "COT TFF report (CFTC) per equity/financial: ES/NQ/RTY/ZN/ZB/6E/6J/DX. Roles: dealer, asset manager, leveraged funds, other."},
            {"name": "get_cot_disaggregated", "description": "COT Disaggregated report (CFTC) per commodities: CL/GC/SI/HG/ZW/ZC/ZS. Roles: producer/merchant, swap dealer, managed money, other."},
            {"name": "get_cot_extreme_positioning", "description": "Scanner posizionamento estremo (percentile ≤5 o ≥95) sui simboli watchlist."},
        ],
    )

    return app