"""Player alias commands."""

from mudlib.commands import CommandDefinition, _registry, register
from mudlib.player import Player


async def cmd_alias(player: Player, args: str) -> None:
    """Create or list aliases.

    Usage:
        alias              - List all aliases
        alias <name>       - Show a specific alias
        alias <name> <exp> - Create an alias
    """
    args = args.strip()

    # No args: list all aliases
    if not args:
        if not player.aliases:
            await player.send("No aliases defined.\r\n")
        else:
            lines = [
                f"{alias} -> {expansion}"
                for alias, expansion in sorted(player.aliases.items())
            ]
            await player.send("\r\n".join(lines) + "\r\n")
        return

    # Check if this is a single-word lookup or a definition
    parts = args.split(None, 1)
    alias_name = parts[0]

    if len(parts) == 1:
        # Show single alias
        if alias_name in player.aliases:
            await player.send(f"{alias_name} -> {player.aliases[alias_name]}\r\n")
        else:
            await player.send(f"No such alias: {alias_name}\r\n")
        return

    # Create alias
    expansion = parts[1]

    # Cannot alias over built-in commands
    if alias_name in _registry:
        await player.send(f"Cannot alias over built-in command: {alias_name}\r\n")
        return

    player.aliases[alias_name] = expansion
    await player.send(f"Alias set: {alias_name} -> {expansion}\r\n")


async def cmd_unalias(player: Player, args: str) -> None:
    """Remove an alias.

    Usage:
        unalias <name>
    """
    alias_name = args.strip()

    if not alias_name:
        await player.send("Usage: unalias <name>\r\n")
        return

    if alias_name in player.aliases:
        del player.aliases[alias_name]
        await player.send(f"Alias removed: {alias_name}\r\n")
    else:
        await player.send(f"No such alias: {alias_name}\r\n")


# Register commands
register(CommandDefinition("alias", cmd_alias))
register(CommandDefinition("unalias", cmd_unalias))