"""Database layer using asyncpg for PostgreSQL."""
import logging
import os
from typing import Optional
import asyncpg

log = logging.getLogger(__name__)


class Database:
    def __init__(self) -> None:
        self._url = os.getenv("DATABASE_URL", "postgresql://bot:bot@localhost:5432/polymarket")
        self._pool: Optional[asyncpg.Pool] = None

    async def connect(self) -> None:
        self._pool = await asyncpg.create_pool(self._url)
        log.info("Database connected")

    async def disconnect(self) -> None:
        if self._pool:
            await self._pool.close()

    async def run_migrations(self) -> None:
        schema_path = os.path.join(os.path.dirname(__file__), "schema.sql")
        with open(schema_path) as f:
            schema = f.read()
        async with self._pool.acquire() as conn:
            await conn.execute(schema)
        log.info("Migrations applied")

    async def save_trade(self, trade) -> None:
        async with self._pool.acquire() as conn:
            await conn.execute("""
                INSERT INTO trades (
                    id, market_id, question, direction, size_usdc,
                    entry_price, shares, fee_usdc, net_cost, timestamp, reasoning, paper,
                    edge_gross, edge_net, prior_prob, final_prob,
                    mid_price, spread_estimate, commission, family_key
                ) VALUES (
                    $1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,
                    $13,$14,$15,$16,$17,$18,$19,$20
                )
                ON CONFLICT (id) DO NOTHING
            """,
                trade.id, trade.market_id, trade.question, trade.direction,
                trade.size_usdc, trade.entry_price, trade.shares, trade.fee_usdc,
                trade.net_cost, trade.timestamp, trade.reasoning, trade.paper,
                # Phase 1 fields
                trade.edge_gross, trade.edge_net, trade.prior_prob, trade.final_prob,
                trade.mid_price, trade.spread_estimate, trade.commission, trade.family_key,
            )

    async def save_daily_metrics(self, metrics: dict) -> None:
        async with self._pool.acquire() as conn:
            await conn.execute("""
                INSERT INTO metrics_daily (
                    timestamp, total_trades, total_deployed, total_fees,
                    total_pnl, win_rate, avg_edge, sharpe_ratio, calibration_score, paper_mode
                ) VALUES ($1,$2,$3,$4,$5,$6,$7,$8,$9,$10)
            """,
                metrics["timestamp"], metrics["total_trades"], metrics["total_deployed"],
                metrics["total_fees"], metrics["total_pnl"], metrics["win_rate"],
                metrics["avg_edge"], metrics["sharpe_ratio"], metrics["calibration_score"],
                metrics["paper_mode"],
            )

    async def get_open_positions(self) -> dict[str, float]:
        """Return {market_id: total_net_cost} for all trades in DB.

        Since there is no closed flag, every trade in the DB is treated as an
        open position.  After a TRUNCATE the query returns nothing, so the
        portfolio correctly resets to a full bankroll.
        """
        async with self._pool.acquire() as conn:
            rows = await conn.fetch(
                "SELECT market_id, SUM(net_cost) AS total FROM trades GROUP BY market_id"
            )
            return {r["market_id"]: float(r["total"]) for r in rows}

    async def get_open_families(self) -> set[str]:
        """Return the set of family_key values from all open positions.

        Used at startup to rebuild occupied_families from DB state so the
        family-deduplication logic survives pod restarts.
        """
        async with self._pool.acquire() as conn:
            rows = await conn.fetch(
                "SELECT DISTINCT family_key FROM trades WHERE family_key IS NOT NULL"
            )
            return {r["family_key"] for r in rows if r["family_key"]}

    async def get_recent_trades(self, limit: int = 100) -> list[dict]:
        async with self._pool.acquire() as conn:
            rows = await conn.fetch(
                "SELECT * FROM trades ORDER BY timestamp DESC LIMIT $1", limit
            )
            return [dict(r) for r in rows]

    async def get_metrics_history(self, days: int = 42) -> list[dict]:
        async with self._pool.acquire() as conn:
            rows = await conn.fetch(
                "SELECT * FROM metrics_daily ORDER BY timestamp DESC LIMIT $1", days
            )
            return [dict(r) for r in rows]