"""DuckDB storage manager for market data.

Provides async-compatible interface for storing and retrieving
market data using DuckDB.
"""

from datetime import datetime
from pathlib import Path

import duckdb
import structlog

from tradefinder.adapters.types import Candle, FundingRate
from tradefinder.data.schemas import ALL_SCHEMAS

logger = structlog.get_logger(__name__)


class DataStorage:
    """DuckDB storage manager for market data.

    Usage:
        storage = DataStorage(Path("/data/tradefinder.duckdb"))
        storage.connect()
        storage.initialize_schema()
        storage.insert_candles(candles)
        storage.disconnect()
    """

    def __init__(self, db_path: Path, *, read_only: bool = False) -> None:
        """Initialize storage with database path.

        Args:
            db_path: Path to DuckDB database file
            read_only: If True, open database in read-only mode (no locking)
        """
        self.db_path = db_path
        self._read_only = read_only
        self._conn: duckdb.DuckDBPyConnection | None = None

    def connect(self) -> None:
        """Connect to the database."""
        if not self._read_only:
            self.db_path.parent.mkdir(parents=True, exist_ok=True)

        self._conn = duckdb.connect(str(self.db_path), read_only=self._read_only)
        logger.info("Connected to DuckDB", path=str(self.db_path), read_only=self._read_only)

    def disconnect(self) -> None:
        """Close database connection."""
        if self._conn:
            self._conn.close()
            self._conn = None
            logger.info("Disconnected from DuckDB")

    def __enter__(self) -> "DataStorage":
        """Context manager entry."""
        self.connect()
        return self

    def __exit__(self, exc_type: object, exc_val: object, exc_tb: object) -> None:
        """Context manager exit."""
        self.disconnect()

    @property
    def conn(self) -> duckdb.DuckDBPyConnection:
        """Get database connection."""
        if self._conn is None:
            raise RuntimeError("Not connected. Call connect() first.")
        return self._conn

    def initialize_schema(self) -> None:
        """Create all database tables and indexes."""
        for schema in ALL_SCHEMAS:
            # Execute each statement separately
            for statement in schema.strip().split(";"):
                statement = statement.strip()
                if statement:
                    self.conn.execute(statement)

        logger.info("Database schema initialized")

    def insert_candles(self, candles: list[Candle], symbol: str, timeframe: str) -> int:
        """Insert candles into the database.

        Args:
            candles: List of Candle objects to insert
            symbol: Trading symbol (e.g., "BTCUSDT")
            timeframe: Candle timeframe (e.g., "1h", "4h")

        Returns:
            Number of candles inserted
        """
        if not candles:
            return 0

        # Prepare data for insertion
        data = [
            (
                symbol,
                timeframe,
                c.timestamp,
                float(c.open),
                float(c.high),
                float(c.low),
                float(c.close),
                float(c.volume),
            )
            for c in candles
        ]

        # Use INSERT OR REPLACE to handle duplicates
        self.conn.executemany(
            """
            INSERT OR REPLACE INTO candles
            (symbol, timeframe, timestamp, open, high, low, close, volume)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?)
            """,
            data,
        )

        logger.debug(
            "Inserted candles",
            symbol=symbol,
            timeframe=timeframe,
            count=len(candles),
        )
        return len(candles)

    def get_candles(
        self,
        symbol: str,
        timeframe: str,
        start: datetime | None = None,
        end: datetime | None = None,
        limit: int | None = None,
    ) -> list[Candle]:
        """Retrieve candles from the database.

        Args:
            symbol: Trading symbol
            timeframe: Candle timeframe
            start: Start timestamp (inclusive)
            end: End timestamp (inclusive)
            limit: Maximum number of candles to return

        Returns:
            List of Candle objects, oldest first
        """
        query = """
            SELECT timestamp, open, high, low, close, volume
            FROM candles
            WHERE symbol = ? AND timeframe = ?
        """
        params: list[str | datetime | int] = [symbol, timeframe]

        if start:
            query += " AND timestamp >= ?"
            params.append(start)
        if end:
            query += " AND timestamp <= ?"
            params.append(end)

        query += " ORDER BY timestamp ASC"

        if limit:
            query += " LIMIT ?"
            params.append(limit)

        result = self.conn.execute(query, params).fetchall()

        from decimal import Decimal

        return [
            Candle(
                timestamp=row[0],
                open=Decimal(str(row[1])),
                high=Decimal(str(row[2])),
                low=Decimal(str(row[3])),
                close=Decimal(str(row[4])),
                volume=Decimal(str(row[5])),
            )
            for row in result
        ]

    def get_latest_candle_timestamp(self, symbol: str, timeframe: str) -> datetime | None:
        """Get the timestamp of the most recent candle.

        Args:
            symbol: Trading symbol
            timeframe: Candle timeframe

        Returns:
            Timestamp of latest candle, or None if no candles exist
        """
        result = self.conn.execute(
            """
            SELECT MAX(timestamp) FROM candles
            WHERE symbol = ? AND timeframe = ?
            """,
            [symbol, timeframe],
        ).fetchone()

        return result[0] if result and result[0] else None

    def insert_funding_rate(self, rate: FundingRate) -> None:
        """Insert a funding rate record.

        Args:
            rate: FundingRate object to insert
        """
        self.conn.execute(
            """
            INSERT OR REPLACE INTO funding_rates
            (symbol, funding_rate, funding_time, mark_price)
            VALUES (?, ?, ?, ?)
            """,
            [
                rate.symbol,
                float(rate.funding_rate),
                rate.funding_time,
                float(rate.mark_price),
            ],
        )

    def get_candle_count(self, symbol: str, timeframe: str) -> int:
        """Get the number of candles stored for a symbol/timeframe.

        Args:
            symbol: Trading symbol
            timeframe: Candle timeframe

        Returns:
            Number of candles
        """
        result = self.conn.execute(
            """
            SELECT COUNT(*) FROM candles
            WHERE symbol = ? AND timeframe = ?
            """,
            [symbol, timeframe],
        ).fetchone()

        return result[0] if result else 0