"""
Database Operations - Async persistence layer for game data.

Provides async operations for persisting and retrieving game data.
Used by StateManager for database persistence and recovery.

Supports session injection for efficient batching and easy testing:
    # Production - auto-manages sessions
    db_ops = DatabaseOperations()
    await db_ops.create_game(...)  # Creates and commits its own session

    # Testing or batching - inject shared session
    async with AsyncSessionLocal() as session:
        db_ops = DatabaseOperations(session)
        await db_ops.create_game(...)  # Uses injected session
        await db_ops.add_lineup(...)   # Same session
        await session.commit()         # Caller commits

Author: Claude
Date: 2025-10-22
"""

# pyright: reportAssignmentType=false, reportArgumentType=false, reportAttributeAccessIssue=false
# Note: SQLAlchemy Column descriptors cause false positives in Pylance/Pyright

import logging
from collections.abc import AsyncGenerator
from contextlib import asynccontextmanager
from uuid import UUID

from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.database.session import AsyncSessionLocal
from app.models.db_models import Game, GameSession, Lineup, Play, Roll, RosterLink
from app.models.roster_models import PdRosterLinkData, SbaRosterLinkData

logger = logging.getLogger(f"{__name__}.DatabaseOperations")


class DatabaseOperations:
    """
    Async database operations for game persistence.

    Provides methods for creating, reading, and updating game data in PostgreSQL.

    Session Management:
        - If constructed without a session, each method creates and commits its own session
        - If constructed with a session, all methods use that session (caller commits)

    Args:
        session: Optional AsyncSession for dependency injection.
                 If provided, caller is responsible for commit/rollback.
    """

    def __init__(self, session: AsyncSession | None = None):
        """
        Initialize DatabaseOperations.

        Args:
            session: Optional AsyncSession. If provided, all operations use this
                     session and caller is responsible for committing.
                     If None, each operation creates its own auto-committing session.
        """
        self._session = session

    @asynccontextmanager
    async def _get_session(self) -> AsyncGenerator[AsyncSession]:
        """
        Get database session for operations.

        If a session was injected at construction:
            - Yields that session
            - Does NOT commit (caller controls transaction)

        If no session was injected:
            - Creates a new session
            - Auto-commits on success
            - Rolls back on exception
        """
        if self._session:
            # Use injected session - caller controls transaction
            yield self._session
        else:
            # Create new session with auto-commit/rollback
            async with AsyncSessionLocal() as session:
                try:
                    yield session
                    await session.commit()
                except Exception:
                    await session.rollback()
                    raise

    async def create_game(
        self,
        game_id: UUID,
        league_id: str,
        home_team_id: int,
        away_team_id: int,
        game_mode: str,
        visibility: str,
        home_team_is_ai: bool = False,
        away_team_is_ai: bool = False,
        ai_difficulty: str | None = None,
    ) -> Game:
        """
        Create new game in database.

        Args:
            game_id: Unique game identifier
            league_id: League identifier ('sba' or 'pd')
            home_team_id: Home team ID
            away_team_id: Away team ID
            game_mode: Game mode ('ranked', 'friendly', 'practice')
            visibility: Visibility ('public', 'private')
            home_team_is_ai: Whether home team is AI
            away_team_is_ai: Whether away team is AI
            ai_difficulty: AI difficulty if applicable

        Returns:
            Created Game model

        Raises:
            SQLAlchemyError: If database operation fails
        """
        async with self._get_session() as session:
            game = Game(
                id=game_id,
                league_id=league_id,
                home_team_id=home_team_id,
                away_team_id=away_team_id,
                game_mode=game_mode,
                visibility=visibility,
                home_team_is_ai=home_team_is_ai,
                away_team_is_ai=away_team_is_ai,
                ai_difficulty=ai_difficulty,
                status="pending",
            )
            session.add(game)
            await session.flush()
            await session.refresh(game)
            logger.info(f"Created game {game_id} in database ({league_id})")
            return game

    async def get_game(self, game_id: UUID) -> Game | None:
        """
        Get game by ID.

        Args:
            game_id: Game identifier

        Returns:
            Game model if found, None otherwise
        """
        async with self._get_session() as session:
            result = await session.execute(select(Game).where(Game.id == game_id))
            game = result.scalar_one_or_none()
            if game:
                logger.debug(f"Retrieved game {game_id} from database")
            return game

    async def update_game_state(
        self,
        game_id: UUID,
        inning: int,
        half: str,
        home_score: int,
        away_score: int,
        status: str | None = None,
    ) -> None:
        """
        Update game state fields using direct UPDATE (no SELECT).

        Args:
            game_id: Game identifier
            inning: Current inning
            half: Current half ('top' or 'bottom')
            home_score: Home team score
            away_score: Away team score
            status: Game status if updating

        Raises:
            ValueError: If game not found
        """
        from sqlalchemy import update

        async with self._get_session() as session:
            # Build update values
            update_values = {
                "current_inning": inning,
                "current_half": half,
                "home_score": home_score,
                "away_score": away_score,
            }

            if status:
                update_values["status"] = status

            # Direct UPDATE statement (no SELECT needed)
            result = await session.execute(
                update(Game).where(Game.id == game_id).values(**update_values)
            )

            if result.rowcount == 0:
                raise ValueError(f"Game {game_id} not found for update")

            logger.debug(f"Updated game {game_id} state (inning {inning}, {half})")

    async def add_pd_lineup_card(
        self,
        game_id: UUID,
        team_id: int,
        card_id: int,
        position: str,
        batting_order: int | None = None,
        is_starter: bool = True,
    ) -> Lineup:
        """
        Add PD card to lineup.

        Args:
            game_id: Game identifier
            team_id: Team identifier
            card_id: Player card ID
            position: Player position
            batting_order: Batting order (1-9) if applicable
            is_starter: Whether player is starting lineup

        Returns:
            Created Lineup model

        Raises:
            SQLAlchemyError: If database operation fails
        """
        async with self._get_session() as session:
            lineup = Lineup(
                game_id=game_id,
                team_id=team_id,
                card_id=card_id,
                player_id=None,
                position=position,
                batting_order=batting_order,
                is_starter=is_starter,
                is_active=True,
            )
            session.add(lineup)
            await session.flush()
            await session.refresh(lineup)
            logger.debug(f"Added PD card {card_id} to lineup in game {game_id}")
            return lineup

    async def add_sba_lineup_player(
        self,
        game_id: UUID,
        team_id: int,
        player_id: int,
        position: str,
        batting_order: int | None = None,
        is_starter: bool = True,
    ) -> Lineup:
        """
        Add SBA player to lineup.

        Args:
            game_id: Game identifier
            team_id: Team identifier
            player_id: Player ID
            position: Player position
            batting_order: Batting order (1-9) if applicable
            is_starter: Whether player is starting lineup

        Returns:
            Created Lineup model

        Raises:
            SQLAlchemyError: If database operation fails
        """
        async with self._get_session() as session:
            lineup = Lineup(
                game_id=game_id,
                team_id=team_id,
                card_id=None,
                player_id=player_id,
                position=position,
                batting_order=batting_order,
                is_starter=is_starter,
                is_active=True,
            )
            session.add(lineup)
            await session.flush()
            await session.refresh(lineup)
            logger.debug(f"Added SBA player {player_id} to lineup in game {game_id}")
            return lineup

    async def get_active_lineup(self, game_id: UUID, team_id: int) -> list[Lineup]:
        """
        Get active lineup for team.

        Args:
            game_id: Game identifier
            team_id: Team identifier

        Returns:
            List of active Lineup models, sorted by batting order
        """
        async with self._get_session() as session:
            result = await session.execute(
                select(Lineup)
                .where(
                    Lineup.game_id == game_id,
                    Lineup.team_id == team_id,
                    Lineup.is_active == True,
                )
                .order_by(Lineup.batting_order)
            )
            lineups = list(result.scalars().all())
            logger.debug(
                f"Retrieved {len(lineups)} active lineup entries for team {team_id}"
            )
            return lineups

    async def create_substitution(
        self,
        game_id: UUID,
        team_id: int,
        player_out_lineup_id: int,
        player_in_card_id: int,
        position: str,
        batting_order: int | None,
        inning: int,
        play_number: int,
    ) -> int:
        """
        Create substitution in database (DB-first pattern).

        Process:
        1. Mark old player inactive (is_active = False)
        2. Create new lineup entry with:
           - is_starter = False
           - is_active = True
           - entered_inning = current inning
           - replacing_id = old player's lineup_id
           - after_play = current play number
        3. Return new lineup_id

        Args:
            game_id: Game identifier
            team_id: Team identifier
            player_out_lineup_id: Lineup ID of player being replaced
            player_in_card_id: Card/Player ID of incoming player
            position: Position for incoming player
            batting_order: Batting order for incoming player (can be None for non-batting positions)
            inning: Current inning
            play_number: Current play number

        Returns:
            New lineup_id for substituted player

        Raises:
            ValueError: If player_out not found
            SQLAlchemyError: If database operation fails
        """
        async with self._get_session() as session:
            # STEP 1: Mark old player inactive
            result = await session.execute(
                select(Lineup).where(Lineup.id == player_out_lineup_id)
            )
            player_out = result.scalar_one_or_none()

            if not player_out:
                raise ValueError(f"Lineup entry {player_out_lineup_id} not found")

            player_out.is_active = False

            # STEP 2: Create new lineup entry
            new_lineup = Lineup(
                game_id=game_id,
                team_id=team_id,
                card_id=player_in_card_id,  # For PD, will use card_id
                player_id=None,  # For SBA, swap these
                position=position,
                batting_order=batting_order,
                is_starter=False,  # Substitutes are never starters
                is_active=True,  # New player is active
                entered_inning=inning,
                replacing_id=player_out_lineup_id,
                after_play=play_number,
            )

            session.add(new_lineup)
            await session.flush()

            new_lineup_id = new_lineup.id  # type: ignore[assignment]

            logger.info(
                f"Substitution created: lineup {player_out_lineup_id} → {new_lineup_id} "
                f"(card {player_in_card_id}, {position}, inning {inning})"
            )

            return new_lineup_id

    async def get_eligible_substitutes(
        self, game_id: UUID, team_id: int
    ) -> list[Lineup]:
        """
        Get all inactive players (potential substitutes).

        Args:
            game_id: Game identifier
            team_id: Team identifier

        Returns:
            List of inactive Lineup models
        """
        async with self._get_session() as session:
            result = await session.execute(
                select(Lineup)
                .where(
                    Lineup.game_id == game_id,
                    Lineup.team_id == team_id,
                    Lineup.is_active == False,
                )
                .order_by(Lineup.batting_order)
            )
            subs = list(result.scalars().all())
            logger.debug(
                f"Retrieved {len(subs)} eligible substitutes for team {team_id}"
            )
            return subs

    async def save_play(self, play_data: dict) -> int:
        """
        Save play to database.

        Args:
            play_data: Dictionary with play data matching Play model fields

        Returns:
            Play ID (primary key)

        Raises:
            SQLAlchemyError: If database operation fails
        """
        async with self._get_session() as session:
            play = Play(**play_data)
            session.add(play)
            await session.flush()  # Get ID without committing
            play_id = play.id
            logger.info(f"Saved play {play.play_number} for game {play.game_id}")
            return play_id  # type: ignore

    async def get_plays(self, game_id: UUID) -> list[Play]:
        """
        Get all plays for game.

        Args:
            game_id: Game identifier

        Returns:
            List of Play models, ordered by play_number
        """
        async with self._get_session() as session:
            result = await session.execute(
                select(Play).where(Play.game_id == game_id).order_by(Play.play_number)
            )
            plays = list(result.scalars().all())
            logger.debug(f"Retrieved {len(plays)} plays for game {game_id}")
            return plays

    async def load_game_state(self, game_id: UUID) -> dict | None:
        """
        Load complete game state for recovery.

        Loads game, lineups, and plays in a single transaction.

        Args:
            game_id: Game identifier

        Returns:
            Dictionary with 'game', 'lineups', and 'plays' keys, or None if game not found
        """
        async with self._get_session() as session:
            # Get game
            game_result = await session.execute(select(Game).where(Game.id == game_id))
            game = game_result.scalar_one_or_none()

            if not game:
                logger.warning(f"Game {game_id} not found for recovery")
                return None

            # Get lineups
            lineup_result = await session.execute(
                select(Lineup).where(
                    Lineup.game_id == game_id, Lineup.is_active == True
                )
            )
            lineups = list(lineup_result.scalars().all())

            # Get plays
            play_result = await session.execute(
                select(Play).where(Play.game_id == game_id).order_by(Play.play_number)
            )
            plays = list(play_result.scalars().all())

            logger.info(
                f"Loaded game state for {game_id}: {len(lineups)} lineups, {len(plays)} plays"
            )

            return {
                "game": {
                    "id": game.id,
                    "league_id": game.league_id,
                    "home_team_id": game.home_team_id,
                    "away_team_id": game.away_team_id,
                    "home_team_is_ai": game.home_team_is_ai,
                    "away_team_is_ai": game.away_team_is_ai,
                    "status": game.status,
                    "current_inning": game.current_inning,
                    "current_half": game.current_half,
                    "home_score": game.home_score,
                    "away_score": game.away_score,
                },
                "lineups": [
                    {
                        "id": l.id,
                        "team_id": l.team_id,
                        "card_id": l.card_id,
                        "player_id": l.player_id,
                        "position": l.position,
                        "batting_order": l.batting_order,
                        "is_active": l.is_active,
                    }
                    for l in lineups
                ],
                "plays": [
                    {
                        "play_number": p.play_number,
                        "inning": p.inning,
                        "half": p.half,
                        "outs_before": p.outs_before,
                        "batting_order": p.batting_order,
                        "outs_recorded": p.outs_recorded,
                        "result_description": p.result_description,
                        "complete": p.complete,
                        # Runner tracking for state recovery
                        "batter_id": p.batter_id,
                        "on_first_id": p.on_first_id,
                        "on_second_id": p.on_second_id,
                        "on_third_id": p.on_third_id,
                        "batter_final": p.batter_final,
                        "on_first_final": p.on_first_final,
                        "on_second_final": p.on_second_final,
                        "on_third_final": p.on_third_final,
                    }
                    for p in plays
                ],
            }

    async def create_game_session(self, game_id: UUID) -> GameSession:
        """
        Create game session record for WebSocket tracking.

        Args:
            game_id: Game identifier

        Returns:
            Created GameSession model
        """
        async with self._get_session() as session:
            game_session = GameSession(game_id=game_id)
            session.add(game_session)
            await session.flush()
            await session.refresh(game_session)
            logger.info(f"Created game session for {game_id}")
            return game_session

    async def update_session_snapshot(
        self, game_id: UUID, state_snapshot: dict
    ) -> None:
        """
        Update session state snapshot.

        Args:
            game_id: Game identifier
            state_snapshot: JSON-serializable state snapshot

        Raises:
            ValueError: If game session not found
        """
        async with self._get_session() as session:
            result = await session.execute(
                select(GameSession).where(GameSession.game_id == game_id)
            )
            game_session = result.scalar_one_or_none()

            if not game_session:
                raise ValueError(f"Game session {game_id} not found")

            game_session.state_snapshot = state_snapshot
            logger.debug(f"Updated session snapshot for {game_id}")

    async def add_pd_roster_card(
        self, game_id: UUID, card_id: int, team_id: int
    ) -> PdRosterLinkData:
        """
        Add a PD card to game roster.

        Args:
            game_id: Game identifier
            card_id: Card identifier
            team_id: Team identifier

        Returns:
            PdRosterLinkData with populated id

        Raises:
            ValueError: If card already rostered or constraint violation
        """
        async with self._get_session() as session:
            roster_link = RosterLink(
                game_id=game_id, card_id=card_id, team_id=team_id
            )
            session.add(roster_link)
            await session.flush()
            await session.refresh(roster_link)
            logger.info(f"Added PD card {card_id} to roster for game {game_id}")

            return PdRosterLinkData(
                id=roster_link.id,
                game_id=roster_link.game_id,
                card_id=roster_link.card_id,
                team_id=roster_link.team_id,
            )

    async def add_sba_roster_player(
        self, game_id: UUID, player_id: int, team_id: int
    ) -> SbaRosterLinkData:
        """
        Add an SBA player to game roster.

        Args:
            game_id: Game identifier
            player_id: Player identifier
            team_id: Team identifier

        Returns:
            SbaRosterLinkData with populated id

        Raises:
            ValueError: If player already rostered or constraint violation
        """
        async with self._get_session() as session:
            roster_link = RosterLink(
                game_id=game_id, player_id=player_id, team_id=team_id
            )
            session.add(roster_link)
            await session.flush()
            await session.refresh(roster_link)
            logger.info(f"Added SBA player {player_id} to roster for game {game_id}")

            return SbaRosterLinkData(
                id=roster_link.id,
                game_id=roster_link.game_id,
                player_id=roster_link.player_id,
                team_id=roster_link.team_id,
            )

    async def get_pd_roster(
        self, game_id: UUID, team_id: int | None = None
    ) -> list[PdRosterLinkData]:
        """
        Get PD cards for a game, optionally filtered by team.

        Args:
            game_id: Game identifier
            team_id: Optional team filter

        Returns:
            List of PdRosterLinkData
        """
        async with self._get_session() as session:
            query = select(RosterLink).where(
                RosterLink.game_id == game_id, RosterLink.card_id.is_not(None)
            )

            if team_id is not None:
                query = query.where(RosterLink.team_id == team_id)

            result = await session.execute(query)
            roster_links = result.scalars().all()

            return [
                PdRosterLinkData(
                    id=link.id,
                    game_id=link.game_id,
                    card_id=link.card_id,
                    team_id=link.team_id,
                )
                for link in roster_links
            ]

    async def get_sba_roster(
        self, game_id: UUID, team_id: int | None = None
    ) -> list[SbaRosterLinkData]:
        """
        Get SBA players for a game, optionally filtered by team.

        Args:
            game_id: Game identifier
            team_id: Optional team filter

        Returns:
            List of SbaRosterLinkData
        """
        async with self._get_session() as session:
            query = select(RosterLink).where(
                RosterLink.game_id == game_id, RosterLink.player_id.is_not(None)
            )

            if team_id is not None:
                query = query.where(RosterLink.team_id == team_id)

            result = await session.execute(query)
            roster_links = result.scalars().all()

            return [
                SbaRosterLinkData(
                    id=link.id,
                    game_id=link.game_id,
                    player_id=link.player_id,
                    team_id=link.team_id,
                )
                for link in roster_links
            ]

    async def remove_roster_entry(self, roster_id: int) -> None:
        """
        Remove a roster entry by ID.

        Args:
            roster_id: RosterLink ID

        Raises:
            ValueError: If roster entry not found
        """
        async with self._get_session() as session:
            result = await session.execute(
                select(RosterLink).where(RosterLink.id == roster_id)
            )
            roster_link = result.scalar_one_or_none()

            if not roster_link:
                raise ValueError(f"Roster entry {roster_id} not found")

            await session.delete(roster_link)
            logger.info(f"Removed roster entry {roster_id}")

    async def save_rolls_batch(self, rolls: list) -> None:
        """
        Save multiple dice rolls in a single transaction.

        Used for batch persistence at end of innings.

        Args:
            rolls: List of DiceRoll objects (AbRoll, JumpRoll, FieldingRoll, D20Roll)

        Raises:
            Exception: If batch save fails
        """
        if not rolls:
            logger.debug("No rolls to save")
            return

        async with self._get_session() as session:
            roll_records = [
                Roll(
                    roll_id=roll.roll_id,
                    game_id=roll.game_id,
                    roll_type=roll.roll_type.value,
                    league_id=roll.league_id,
                    team_id=roll.team_id,
                    player_id=roll.player_id,
                    roll_data=roll.to_dict(),  # Store full roll as JSONB
                    context=roll.context,
                    timestamp=roll.timestamp,
                )
                for roll in rolls
            ]

            session.add_all(roll_records)
            await session.flush()
            logger.info(f"Batch saved {len(rolls)} rolls")

    async def get_rolls_for_game(
        self,
        game_id: UUID,
        roll_type: str | None = None,
        team_id: int | None = None,
        limit: int = 100,
    ) -> list[Roll]:
        """
        Get roll history for a game with optional filtering.

        Args:
            game_id: Game identifier
            roll_type: Optional filter by roll type ('ab', 'jump', 'fielding', 'd20')
            team_id: Optional filter by team
            limit: Maximum rolls to return

        Returns:
            List of Roll objects
        """
        async with self._get_session() as session:
            query = select(Roll).where(Roll.game_id == game_id)

            if roll_type:
                query = query.where(Roll.roll_type == roll_type)

            if team_id is not None:
                query = query.where(Roll.team_id == team_id)

            query = query.order_by(Roll.timestamp.desc()).limit(limit)

            result = await session.execute(query)
            return list(result.scalars().all())

    # ============================================================================
    # ROLLBACK OPERATIONS
    # ============================================================================

    async def delete_plays_after(self, game_id: UUID, after_play_number: int) -> int:
        """
        Delete all plays after a specific play number.

        Used for rolling back plays when a mistake is made.

        Args:
            game_id: Game to delete plays from
            after_play_number: Delete plays with play_number > this value

        Returns:
            Number of plays deleted
        """
        from sqlalchemy import delete

        async with self._get_session() as session:
            stmt = delete(Play).where(
                Play.game_id == game_id, Play.play_number > after_play_number
            )

            result = await session.execute(stmt)

            deleted_count = result.rowcount
            logger.info(
                f"Deleted {deleted_count} plays after play {after_play_number} for game {game_id}"
            )
            return deleted_count

    async def delete_substitutions_after(
        self, game_id: UUID, after_play_number: int
    ) -> int:
        """
        Delete all substitutions that occurred after a specific play number.

        Used for rolling back lineups when plays are deleted.

        Args:
            game_id: Game to delete substitutions from
            after_play_number: Delete lineup entries with after_play >= this value

        Returns:
            Number of lineup entries deleted
        """
        from sqlalchemy import delete

        async with self._get_session() as session:
            stmt = delete(Lineup).where(
                Lineup.game_id == game_id, Lineup.after_play >= after_play_number
            )

            result = await session.execute(stmt)

            deleted_count = result.rowcount
            logger.info(
                f"Deleted {deleted_count} substitutions after play {after_play_number} for game {game_id}"
            )
            return deleted_count

    async def delete_rolls_after(self, game_id: UUID, after_play_number: int) -> int:
        """
        Delete all dice rolls after a specific play number.

        Used for rolling back dice roll history when plays are deleted.

        Args:
            game_id: Game to delete rolls from
            after_play_number: Delete rolls with play_number > this value

        Returns:
            Number of rolls deleted
        """
        from sqlalchemy import delete

        async with self._get_session() as session:
            stmt = delete(Roll).where(
                Roll.game_id == game_id, Roll.play_number > after_play_number
            )

            result = await session.execute(stmt)

            deleted_count = result.rowcount
            logger.info(
                f"Deleted {deleted_count} rolls after play {after_play_number} for game {game_id}"
            )
            return deleted_count