"""
FastAPI Backend — serves metrics and trade data to the React dashboard.
"""
from contextlib import asynccontextmanager
import os
from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware

from bot.data.db import Database

db = Database()


@asynccontextmanager
async def lifespan(app: FastAPI):
    await db.connect()
    yield
    await db.disconnect()


app = FastAPI(title="Polymarket Bot API", lifespan=lifespan)

app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["GET"],
    allow_headers=["*"],
)


@app.get("/health")
async def health():
    return {"status": "ok", "paper_mode": os.getenv("PAPER_MODE", "true")}


@app.get("/api/metrics")
async def get_metrics():
    history = await db.get_metrics_history(days=42)
    if not history:
        return {"history": [], "latest": None}
    return {"history": history, "latest": history[0]}


@app.get("/api/trades")
async def get_trades(limit: int = 50, status: str = "open"):
    """
    status: "open" (default) | "closed" | "all"
    Each trade includes a computed "status" field.
    """
    if status not in ("open", "closed", "all"):
        status = "open"
    filter_status = None if status == "all" else status
    trades = await db.get_recent_trades(limit=limit, status=filter_status)
    return {"trades": trades, "count": len(trades), "status_filter": status}


@app.get("/api/summary")
async def get_summary():
    """Dashboard summary card data."""
    history = await db.get_metrics_history(days=1)
    trades = await db.get_recent_trades(limit=500)

    latest = history[0] if history else {}
    paper_bankroll = float(os.getenv("PAPER_BANKROLL", "10000"))
    total_deployed = sum(t.get("net_cost", 0) for t in trades)

    return {
        "paper_mode": os.getenv("PAPER_MODE", "true") == "true",
        "paper_bankroll": paper_bankroll,
        "total_trades": len(trades),
        "total_deployed": total_deployed,
        "total_pnl": latest.get("total_pnl", 0),
        "win_rate": latest.get("win_rate", 0),
        "sharpe_ratio": latest.get("sharpe_ratio", 0),
        "calibration_score": latest.get("calibration_score", 0),
        "promotion_ready": (
            latest.get("sharpe_ratio", 0) >= 0.5
            and latest.get("win_rate", 0) >= 0.52
            and latest.get("calibration_score", 0) >= 0.7
            and len(trades) >= 50
        ),
    }