"""
Interactive REPL for terminal client.

Provides an interactive shell that keeps game state in memory across commands.
Uses Python's cmd module for readline support and command completion.

Author: Claude
Date: 2025-10-26
"""
import asyncio
import logging
import cmd
from uuid import UUID, uuid4
from typing import Optional

from app.core.game_engine import game_engine
from app.core.state_manager import state_manager
from app.models.game_models import DefensiveDecision, OffensiveDecision
from app.database.operations import DatabaseOperations
from terminal_client import display
from terminal_client.config import Config
from terminal_client.commands import game_commands
from terminal_client.completions import GameREPLCompletions
from terminal_client.help_text import show_help, HelpFormatter
from terminal_client.arg_parser import (
    parse_new_game_args,
    parse_defensive_args,
    parse_offensive_args,
    parse_quick_play_args,
    parse_use_game_args,
    ArgumentParseError
)

logger = logging.getLogger(f'{__name__}.repl')


class GameREPL(GameREPLCompletions, cmd.Cmd):
    """Interactive REPL for game engine testing."""

    intro = """
╔══════════════════════════════════════════════════════════════════════════════╗
║                  Paper Dynasty Game Engine - Terminal Client                 ║
║                              Interactive Mode                                ║
╚══════════════════════════════════════════════════════════════════════════════╝

Type 'help' to see all available commands.
Type 'help <command>' for detailed information about a specific command.
Use TAB for auto-completion of commands and options.

Quick start:
  new_game          Create and start a new game
  status            Show current game state
  defensive         Submit defensive decision
  offensive         Submit offensive decision
  resolve           Resolve the play
  quick_play 10     Auto-play 10 plays

Press Ctrl+D or type 'quit' to exit.

"""
    prompt = '⚾ > '

    def __init__(self):
        # Initialize both parent classes
        cmd.Cmd.__init__(self)
        GameREPLCompletions.__init__(self)

        self.current_game_id: Optional[UUID] = None
        self.db_ops = DatabaseOperations()

        # Create persistent event loop for entire REPL session
        self.loop = asyncio.new_event_loop()
        asyncio.set_event_loop(self.loop)

        # Try to load current game from config
        saved_game = Config.get_current_game()
        if saved_game:
            self.current_game_id = saved_game
            display.print_info(f"Loaded saved game: {saved_game}")

    def _ensure_game(self) -> UUID:
        """Ensure current game is set."""
        if self.current_game_id is None:
            display.print_error("No current game. Use 'new_game' first.")
            raise ValueError("No current game")
        return self.current_game_id

    async def _ensure_game_loaded(self, game_id: UUID) -> None:
        """
        Ensure game is loaded in state_manager.

        If game exists in database but not in memory, recover it using
        state_manager.recover_game() which replays plays to rebuild state,
        then prepare the next play to populate snapshot fields.
        """
        # Check if already in memory
        state = state_manager.get_state(game_id)
        if state is not None:
            return  # Already loaded

        # Try to recover from database
        try:
            display.print_info(f"Loading game {game_id} from database...")
            recovered_state = await state_manager.recover_game(game_id)

            if recovered_state and recovered_state.status == "active":
                # Call _prepare_next_play to populate snapshot fields
                # (batter_id, pitcher_id, catcher_id, on_base_code)
                await game_engine._prepare_next_play(recovered_state)
                logger.debug(f"Prepared snapshot for recovered game {game_id}")

            display.print_success("Game loaded successfully")
        except Exception as e:
            display.print_error(f"Failed to load game: {e}")
            logger.error(f"Game recovery failed for {game_id}: {e}", exc_info=True)
            raise ValueError(f"Game {game_id} not found")

    def _run_async(self, coro):
        """
        Helper to run async functions using persistent event loop.

        This keeps database connections alive across commands.
        """
        return self.loop.run_until_complete(coro)

    # ==================== Game Management Commands ====================

    def do_new_game(self, arg):
        """
        Create a new game with lineups and start it.

        Usage: new_game [--league sba|pd] [--home-team N] [--away-team N]

        Examples:
          new_game
          new_game --league pd
          new_game --home-team 5 --away-team 3
        """
        async def _new_game():
            try:
                # Parse arguments with robust parser
                args = parse_new_game_args(arg)

                # Use shared command
                gid, success = await game_commands.create_new_game(
                    league=args['league'],
                    home_team=args['home_team'],
                    away_team=args['away_team'],
                    set_current=True
                )

                if success:
                    self.current_game_id = gid

            except ArgumentParseError as e:
                display.print_error(f"Invalid arguments: {e}")
            except Exception as e:
                display.print_error(f"Failed to create game: {e}")
                logger.exception("New game error")

        self._run_async(_new_game())

    def do_defensive(self, arg):
        """
        Submit defensive decision.

        Usage: defensive [--alignment TYPE] [--infield DEPTH] [--outfield DEPTH] [--hold BASES]

        Options:
          --alignment    normal, shifted_left, shifted_right, extreme_shift
          --infield      in, normal, back, double_play
          --outfield     in, normal, back
          --hold         Comma-separated bases (e.g., 1,3)

        Examples:
          defensive
          defensive --alignment shifted_left
          defensive --infield double_play --hold 1,3
        """
        async def _defensive():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Parse arguments with robust parser
                args = parse_defensive_args(arg)

                # Submit decision
                await game_commands.submit_defensive_decision(
                    game_id=gid,
                    alignment=args['alignment'],
                    infield=args['infield'],
                    outfield=args['outfield'],
                    hold_runners=args['hold']
                )

            except ArgumentParseError as e:
                display.print_error(f"Invalid arguments: {e}")
            except ValueError:
                pass  # Already printed error
            except Exception as e:
                display.print_error(f"Failed: {e}")
                logger.exception("Defensive error")

        self._run_async(_defensive())

    def do_offensive(self, arg):
        """
        Submit offensive decision.

        Usage: offensive [--approach TYPE] [--steal BASES] [--hit-run] [--bunt]

        Options:
          --approach     normal, contact, power, patient
          --steal        Comma-separated bases (e.g., 2,3)
          --hit-run      Enable hit-and-run (flag)
          --bunt         Attempt bunt (flag)

        Examples:
          offensive
          offensive --approach power
          offensive --steal 2 --hit-run
        """
        async def _offensive():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Parse arguments with robust parser
                args = parse_offensive_args(arg)

                # Submit decision
                await game_commands.submit_offensive_decision(
                    game_id=gid,
                    approach=args['approach'],
                    steal_attempts=args['steal'],
                    hit_and_run=args['hit_run'],
                    bunt_attempt=args['bunt']
                )

            except ArgumentParseError as e:
                display.print_error(f"Invalid arguments: {e}")
            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")
                logger.exception("Offensive error")

        self._run_async(_offensive())

    def do_resolve(self, arg):
        """
        Resolve the current play.

        Usage: resolve

        Both defensive and offensive decisions must be submitted first.
        """
        async def _resolve():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Use shared command
                await game_commands.resolve_play(gid)

            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")
                logger.exception("Resolve error")

        self._run_async(_resolve())

    def do_list_outcomes(self, arg):
        """
        List all available PlayOutcome values for manual outcome testing.

        Usage: list_outcomes

        Displays a categorized table of all play outcomes that can be used
        with the 'resolve_with' command for testing specific scenarios.
        """
        # This is synchronous, no need for async
        game_commands.list_outcomes()

    def do_resolve_with(self, arg):
        """
        Resolve the current play with a specific outcome (for testing).

        Usage: resolve_with <outcome>

        Arguments:
          outcome    PlayOutcome value (e.g., single_1, homerun, strikeout)

        This command allows you to force a specific outcome instead of
        rolling dice, useful for testing runner advancement, specific
        game states, and edge cases.

        Use 'list_outcomes' to see all available outcome values.

        Examples:
          resolve_with single_1
          resolve_with homerun
          resolve_with groundball_a
          resolve_with double_uncapped
        """
        async def _resolve_with():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Parse outcome argument
                outcome_str = arg.strip().lower()
                if not outcome_str:
                    display.print_error("Missing outcome argument")
                    display.print_info("Usage: resolve_with <outcome>")
                    display.print_info("Use 'list_outcomes' to see available values")
                    return

                # Try to convert string to PlayOutcome enum
                from app.config import PlayOutcome
                try:
                    outcome = PlayOutcome(outcome_str)
                except ValueError:
                    display.print_error(f"Invalid outcome: {outcome_str}")
                    display.print_info("Use 'list_outcomes' to see valid values")
                    return

                # Use shared command with forced outcome
                await game_commands.resolve_play(gid, forced_outcome=outcome)

            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")
                logger.exception("Resolve with outcome error")

        self._run_async(_resolve_with())

    def do_status(self, arg):
        """
        Display current game state.

        Usage: status
        """
        async def _status():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Use shared command
                await game_commands.show_game_status(gid)

            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")

        self._run_async(_status())

    def do_quick_play(self, arg):
        """
        Auto-play multiple plays with default decisions.

        Usage: quick_play [COUNT]

        Examples:
          quick_play        # Play 1 play
          quick_play 10     # Play 10 plays
          quick_play 27     # Play ~3 innings
        """
        async def _quick_play():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Parse arguments with robust parser
                args = parse_quick_play_args(arg)

                # Execute quick play
                plays_completed = await game_commands.quick_play_rounds(
                    game_id=gid,
                    count=args['count']
                )

                display.print_success(f"Completed {plays_completed} plays")

            except ArgumentParseError as e:
                display.print_error(f"Invalid arguments: {e}")
            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")
                logger.exception("Quick play error")

        self._run_async(_quick_play())

    def do_box_score(self, arg):
        """
        Display box score.

        Usage: box-score
        """
        async def _box_score():
            try:
                gid = self._ensure_game()
                await self._ensure_game_loaded(gid)

                # Use shared command
                await game_commands.show_box_score(gid)

            except ValueError:
                pass
            except Exception as e:
                display.print_error(f"Failed: {e}")

        self._run_async(_box_score())

    def do_manual_outcome(self, arg):
        """
        Validate a manual outcome submission (for testing manual mode).

        Usage: manual_outcome <outcome> [location]

        Arguments:
          outcome    PlayOutcome enum value (e.g., groundball_c, single_1)
          location   Hit location (e.g., SS, 1B, LF) - optional

        Examples:
          manual_outcome strikeout
          manual_outcome groundball_c SS
          manual_outcome flyout_b LF
          manual_outcome single_1

        Note: This validates the outcome but doesn't resolve the play yet.
              Full integration with play resolution coming in Week 7 Task 6.
        """
        parts = arg.split()
        if not parts:
            display.print_error("Usage: manual_outcome <outcome> [location]")
            display.console.print("[dim]Example: manual_outcome groundball_c SS[/dim]")
            return

        outcome = parts[0]
        location = parts[1] if len(parts) > 1 else None

        game_commands.validate_manual_outcome(outcome, location)

    def do_test_location(self, arg):
        """
        Test hit location distribution for an outcome.

        Usage: test_location <outcome> [handedness] [count]

        Arguments:
          outcome      PlayOutcome enum value (e.g., groundball_c)
          handedness   'L' or 'R' (default: R)
          count        Number of samples (default: 100)

        Examples:
          test_location groundball_c
          test_location groundball_c L
          test_location flyout_b R 200

        Shows distribution of hit locations based on pull rates.
        """
        parts = arg.split()
        if not parts:
            display.print_error("Usage: test_location <outcome> [handedness] [count]")
            display.console.print("[dim]Example: test_location groundball_c R 100[/dim]")
            return

        outcome = parts[0]
        handedness = parts[1] if len(parts) > 1 else 'R'
        count = int(parts[2]) if len(parts) > 2 else 100

        # Validate handedness
        if handedness not in ['L', 'R']:
            display.print_error("Handedness must be 'L' or 'R'")
            return

        game_commands.test_hit_location(outcome, handedness, count)

    def do_list_games(self, arg):
        """
        List all games in state manager.

        Usage: list-games
        """
        games = state_manager.list_games()

        if not games:
            display.print_warning("No active games in memory")
            return

        display.print_info(f"Active games: {len(games)}")
        for game_id in games:
            marker = "* " if game_id == self.current_game_id else "  "
            display.console.print(f"{marker}{game_id}")

    def do_use_game(self, arg):
        """
        Switch to a different game.

        Usage: use_game <game_id>

        Example:
          use_game a1b2c3d4-e5f6-7890-abcd-ef1234567890
        """
        try:
            # Parse arguments with robust parser
            args = parse_use_game_args(arg)

            gid = UUID(args['game_id'])
            self.current_game_id = gid
            Config.set_current_game(gid)
            display.print_success(f"Switched to game: {gid}")

        except ArgumentParseError as e:
            display.print_error(f"Invalid arguments: {e}")
        except ValueError:
            display.print_error(f"Invalid UUID: {arg}")

    def do_config(self, arg):
        """
        Show configuration.

        Usage: config
        """
        config_path = Config.get_config_path()
        display.print_info(f"Config file: {config_path}")

        if self.current_game_id:
            display.console.print(f"\n[green]Current game:[/green] {self.current_game_id}")
        else:
            display.console.print("\n[yellow]No current game set[/yellow]")

    # ==================== Enhanced Help System ====================

    def do_help(self, arg):
        """
        Show help for commands.

        Usage:
          help              List all commands
          help <command>    Show detailed help for a command
        """
        if arg:
            # Show detailed help for specific command
            show_help(arg)
        else:
            # Show command list
            HelpFormatter.show_command_list()

    def help_new_game(self):
        """Show detailed help for new_game command."""
        show_help('new_game')

    def help_defensive(self):
        """Show detailed help for defensive command."""
        show_help('defensive')

    def help_offensive(self):
        """Show detailed help for offensive command."""
        show_help('offensive')

    def help_resolve(self):
        """Show detailed help for resolve command."""
        show_help('resolve')

    def help_quick_play(self):
        """Show detailed help for quick_play command."""
        show_help('quick_play')

    def help_status(self):
        """Show detailed help for status command."""
        show_help('status')

    def help_box_score(self):
        """Show detailed help for box_score command."""
        show_help('box_score')

    def help_list_games(self):
        """Show detailed help for list_games command."""
        show_help('list_games')

    def help_use_game(self):
        """Show detailed help for use_game command."""
        show_help('use_game')

    def help_config(self):
        """Show detailed help for config command."""
        show_help('config')

    def help_clear(self):
        """Show detailed help for clear command."""
        show_help('clear')

    # ==================== REPL Control Commands ====================

    def do_clear(self, arg):
        """Clear the screen."""
        display.console.clear()

    def do_quit(self, arg):
        """Exit the REPL."""
        display.print_info("Goodbye!")
        # Clean up event loop
        self.loop.close()
        return True

    def do_exit(self, arg):
        """Exit the REPL."""
        return self.do_quit(arg)

    def do_EOF(self, arg):
        """Handle Ctrl+D."""
        print()  # New line
        return self.do_quit(arg)

    def emptyline(self):
        """Do nothing on empty line."""
        pass

    def default(self, line):
        """Handle unknown commands."""
        display.print_error(f"Unknown command: {line}")
        display.print_info("Type 'help' for available commands")


def start_repl():
    """Start the interactive REPL."""
    repl = GameREPL()
    repl.cmdloop()


if __name__ == "__main__":
    start_repl()