"""One-time cleanup for retired strategy samples."""

from __future__ import annotations

import os
import subprocess
from datetime import datetime
from pathlib import Path

from app.db.postgres_connection import get_database_url
from app.db.schema import get_conn

LEGACY_STRATEGY_CODES = (
    "main_composite_v1",
    "volume_ignition_1h_v1",
    "intraday_momentum_15m_v1",
    "box_retest_1h_v1",
    "box_retest_4h_v1",
    "compression_breakout_4h_v1",
    "breakdown_retest_short_1h_v1",
)

CONFIRM_TOKEN = "CLEAN_LEGACY_STRATEGY_SAMPLES"


def _repo_root() -> Path:
    return Path(__file__).resolve().parents[2]


def backup_database() -> str:
    backup_dir = _repo_root() / "data" / "backups"
    backup_dir.mkdir(parents=True, exist_ok=True)
    stamp = datetime.now().strftime("%Y%m%d_%H%M%S")
    out_file = backup_dir / f"legacy_strategy_cleanup_before_{stamp}.dump"
    subprocess.run(
        ["pg_dump", get_database_url(), "--format=custom", "--file", str(out_file)],
        check=True,
    )
    return str(out_file)


def cleanup_legacy_strategy_samples(*, confirm: str, create_backup: bool = True) -> dict:
    if confirm != CONFIRM_TOKEN:
        raise ValueError(f"confirm must be {CONFIRM_TOKEN}")

    backup_path = backup_database() if create_backup else ""
    conn = get_conn()
    deleted = {
        "paper_trade_events": 0,
        "paper_orders": 0,
        "paper_trades": 0,
        "recommendation": 0,
        "strategy_signals": 0,
    }
    try:
        trade_ids = [
            int(row["id"])
            for row in conn.execute(
                "SELECT id FROM paper_trades WHERE strategy_code = ANY(%s)",
                (list(LEGACY_STRATEGY_CODES),),
            ).fetchall()
        ]
        recommendation_ids = [
            int(row["id"])
            for row in conn.execute(
                "SELECT id FROM recommendation WHERE strategy_code = ANY(%s)",
                (list(LEGACY_STRATEGY_CODES),),
            ).fetchall()
        ]

        with conn.transaction():
            if trade_ids:
                deleted["paper_trade_events"] += int(
                    conn.execute(
                        "SELECT COUNT(*) FROM paper_trade_events WHERE trade_id = ANY(%s)",
                        (trade_ids,),
                    ).fetchone()[0]
                    or 0
                )
                conn.execute("DELETE FROM paper_trade_events WHERE trade_id = ANY(%s)", (trade_ids,))
            if recommendation_ids:
                deleted["paper_trade_events"] += int(
                    conn.execute(
                        "SELECT COUNT(*) FROM paper_trade_events WHERE recommendation_id = ANY(%s)",
                        (recommendation_ids,),
                    ).fetchone()[0]
                    or 0
                )
                conn.execute("DELETE FROM paper_trade_events WHERE recommendation_id = ANY(%s)", (recommendation_ids,))

                deleted["paper_orders"] = int(
                    conn.execute(
                        "SELECT COUNT(*) FROM paper_orders WHERE recommendation_id = ANY(%s) OR strategy_code = ANY(%s)",
                        (recommendation_ids, list(LEGACY_STRATEGY_CODES)),
                    ).fetchone()[0]
                    or 0
                )
                conn.execute(
                    "DELETE FROM paper_orders WHERE recommendation_id = ANY(%s) OR strategy_code = ANY(%s)",
                    (recommendation_ids, list(LEGACY_STRATEGY_CODES)),
                )
            else:
                deleted["paper_orders"] = int(
                    conn.execute(
                        "SELECT COUNT(*) FROM paper_orders WHERE strategy_code = ANY(%s)",
                        (list(LEGACY_STRATEGY_CODES),),
                    ).fetchone()[0]
                    or 0
                )
                conn.execute("DELETE FROM paper_orders WHERE strategy_code = ANY(%s)", (list(LEGACY_STRATEGY_CODES),))

            deleted["paper_trades"] = int(
                conn.execute(
                    "SELECT COUNT(*) FROM paper_trades WHERE strategy_code = ANY(%s)",
                    (list(LEGACY_STRATEGY_CODES),),
                ).fetchone()[0]
                or 0
            )
            conn.execute("DELETE FROM paper_trades WHERE strategy_code = ANY(%s)", (list(LEGACY_STRATEGY_CODES),))

            deleted["recommendation"] = int(
                conn.execute(
                    "SELECT COUNT(*) FROM recommendation WHERE strategy_code = ANY(%s)",
                    (list(LEGACY_STRATEGY_CODES),),
                ).fetchone()[0]
                or 0
            )
            conn.execute("DELETE FROM recommendation WHERE strategy_code = ANY(%s)", (list(LEGACY_STRATEGY_CODES),))

            deleted["strategy_signals"] = int(
                conn.execute(
                    "SELECT COUNT(*) FROM strategy_signals WHERE strategy_code = ANY(%s)",
                    (list(LEGACY_STRATEGY_CODES),),
                ).fetchone()[0]
                or 0
            )
            conn.execute("DELETE FROM strategy_signals WHERE strategy_code = ANY(%s)", (list(LEGACY_STRATEGY_CODES),))
        conn.commit()
    except Exception:
        conn.rollback()
        raise
    finally:
        conn.close()

    return {
        "status": "completed",
        "scope": "legacy-strategies",
        "legacy_strategy_codes": list(LEGACY_STRATEGY_CODES),
        "backup_path": backup_path,
        "deleted": deleted,
        "run_time": datetime.now().isoformat(),
    }