"""One-shot and rate-limited Telegram checkpoint alerts.

Called from the main trading loop at the end of each cycle.
Errors are swallowed — checkpoint failures must never break the loop.
"""
import logging
from datetime import datetime, timezone
from typing import Optional

from bot.notify import telegram

log = logging.getLogger(__name__)

_EXPOSURE_COOLDOWN_HOURS = 6


class CheckpointMonitor:

    async def check_all(
        self,
        db,
        exposure_pct: float,
        exposure_cap_pct: float,
    ) -> None:
        for name, coro in [
            ("primer_match_accepted", self._check_primer_match_accepted(db)),
            ("primer_trade_phase6",   self._check_primer_trade_phase6(db)),
            ("primer_resolved",       self._check_primer_resolved(db)),
            ("exposure_cerca_cap",    self._check_exposure_cerca_cap(db, exposure_pct, exposure_cap_pct)),
        ]:
            try:
                await coro
            except Exception as exc:
                log.warning("checkpoint %s failed: %s", name, exc)

    # ── helpers ──────────────────────────────────────────────────────────────

    async def _one_shot_fired(self, db, name: str) -> bool:
        async with db._pool.acquire() as conn:
            row = await conn.fetchrow(
                "SELECT 1 FROM checkpoint_alerts WHERE checkpoint_name = $1", name
            )
            return row is not None

    async def _mark_one_shot(self, db, name: str) -> None:
        async with db._pool.acquire() as conn:
            await conn.execute(
                "INSERT INTO checkpoint_alerts (checkpoint_name, fired_at) VALUES ($1, NOW())",
                name,
            )

    async def _last_fired_at(self, db, name: str) -> Optional[datetime]:
        async with db._pool.acquire() as conn:
            row = await conn.fetchrow(
                "SELECT last_fired_at FROM checkpoint_alerts WHERE checkpoint_name = $1",
                name,
            )
        if row is None:
            return None
        return row["last_fired_at"]

    async def _upsert_repeatable(self, db, name: str) -> None:
        async with db._pool.acquire() as conn:
            await conn.execute(
                """
                INSERT INTO checkpoint_alerts (checkpoint_name, fired_at, last_fired_at)
                VALUES ($1, NOW(), NOW())
                ON CONFLICT (checkpoint_name) DO UPDATE SET last_fired_at = NOW()
                """,
                name,
            )

    # ── checkpoints ──────────────────────────────────────────────────────────

    async def _check_primer_match_accepted(self, db) -> None:
        if await self._one_shot_fired(db, "primer_match_accepted"):
            return

        async with db._pool.acquire() as conn:
            row = await conn.fetchrow(
                """
                SELECT match_score, poly_question, mfld_market_title
                FROM manifold_match_audit
                WHERE match_status = 'accepted'
                ORDER BY timestamp ASC
                LIMIT 1
                """
            )
        if not row:
            return

        score  = float(row["match_score"] or 0.0)
        poly_q = (row["poly_question"] or "")[:60]
        mfld_t = (row["mfld_market_title"] or "")[:60]

        await telegram._send(
            f"✅ Primer match Manifold accepted — score={score:.2f} "
            f"poly='{poly_q}' mfld='{mfld_t}'"
        )
        await self._mark_one_shot(db, "primer_match_accepted")
        log.info("checkpoint primer_match_accepted fired")

    async def _check_primer_trade_phase6(self, db) -> None:
        if await self._one_shot_fired(db, "primer_trade_phase6"):
            return

        async with db._pool.acquire() as conn:
            row = await conn.fetchrow(
                """
                SELECT question, mfld_match_score, edge_net
                FROM trades
                WHERE mfld_match_score IS NOT NULL
                  AND (excluded_from_metrics IS NOT TRUE)
                ORDER BY timestamp ASC
                LIMIT 1
                """
            )
        if not row:
            return

        question = (row["question"] or "")[:70]
        score    = float(row["mfld_match_score"] or 0.0)
        edge     = float(row["edge_net"] or 0.0)

        await telegram._send(
            f"🎯 Primer trade Phase-6 limpio — {question} "
            f"score={score:.2f} edge={edge:.3f}"
        )
        await self._mark_one_shot(db, "primer_trade_phase6")
        log.info("checkpoint primer_trade_phase6 fired")

    async def _check_primer_resolved(self, db) -> None:
        if await self._one_shot_fired(db, "primer_resolved"):
            return

        async with db._pool.acquire() as conn:
            row = await conn.fetchrow(
                """
                SELECT question, resolution, close_pnl
                FROM trades
                WHERE resolution IS NOT NULL
                  AND (excluded_from_metrics IS NOT TRUE)
                ORDER BY closed_at ASC
                LIMIT 1
                """
            )
        if not row:
            return

        question   = (row["question"] or "")[:70]
        resolution = float(row["resolution"] or 0.0)
        pnl        = float(row["close_pnl"] or 0.0)

        await telegram._send(
            f"🏁 Primer mercado resuelto — {question} "
            f"result={resolution} pnl={pnl:.2f}"
        )
        await self._mark_one_shot(db, "primer_resolved")
        log.info("checkpoint primer_resolved fired")

    async def _check_exposure_cerca_cap(
        self, db, exposure_pct: float, exposure_cap_pct: float
    ) -> None:
        if exposure_pct < 0.80 * exposure_cap_pct:
            return

        last = await self._last_fired_at(db, "exposure_cerca_cap")
        if last is not None:
            now_utc = datetime.now(timezone.utc)
            if last.tzinfo is None:
                last = last.replace(tzinfo=timezone.utc)
            elapsed_hours = (now_utc - last).total_seconds() / 3600
            if elapsed_hours < _EXPOSURE_COOLDOWN_HOURS:
                return

        await telegram._send(
            f"⚠️ Exposure al 80% del cap — revisar posiciones "
            f"({exposure_pct * 100:.1f}% / {exposure_cap_pct * 100:.1f}%)"
        )
        await self._upsert_repeatable(db, "exposure_cerca_cap")
        log.info(
            "checkpoint exposure_cerca_cap fired (%.1f%% / %.1f%%)",
            exposure_pct * 100, exposure_cap_pct * 100,
        )