"""
Discord Helper Utilities

Common Discord-related helper functions for channel lookups,
message sending, and formatting.
"""

from typing import Optional, List
import discord
from discord.ext import commands

from config import get_config
from models.play import Play
from models.team import Team
from utils.logging import get_contextual_logger

logger = get_contextual_logger(__name__)


async def get_channel_by_name(
    bot: commands.Bot, channel_name: str
) -> Optional[discord.TextChannel]:
    """
    Get a text channel by name from the configured guild.

    Args:
        bot: Discord bot instance
        channel_name: Name of the channel to find

    Returns:
        TextChannel if found, None otherwise
    """
    config = get_config()
    guild_id = config.guild_id

    if not guild_id:
        logger.error("GUILD_ID not configured")
        return None

    guild = bot.get_guild(guild_id)
    if not guild:
        logger.error(f"Guild {guild_id} not found")
        return None

    channel = discord.utils.get(guild.text_channels, name=channel_name)

    if not channel:
        logger.warning(f"Channel '{channel_name}' not found in guild {guild_id}")
        return None

    return channel


async def send_to_channel(
    bot: commands.Bot,
    channel_name: str,
    content: Optional[str] = None,
    embed: Optional[discord.Embed] = None,
) -> bool:
    """
    Send a message to a channel by name.

    Args:
        bot: Discord bot instance
        channel_name: Name of the channel
        content: Text content to send
        embed: Embed to send

    Returns:
        True if message sent successfully, False otherwise
    """
    channel = await get_channel_by_name(bot, channel_name)

    if not channel:
        logger.error(f"Cannot send to channel '{channel_name}' - not found")
        return False

    try:
        # Build kwargs to avoid passing None for embed
        kwargs = {}
        if content is not None:
            kwargs["content"] = content
        if embed is not None:
            kwargs["embed"] = embed

        await channel.send(**kwargs)
        logger.info(f"Sent message to #{channel_name}")
        return True
    except Exception as e:
        logger.error(f"Failed to send message to #{channel_name}: {e}")
        return False


def format_key_plays(plays: List[Play], away_team: Team, home_team: Team) -> str:
    """
    Format top plays into embed field text.

    Args:
        plays: List of Play objects (should be sorted by WPA)
        away_team: Away team object
        home_team: Home team object

    Returns:
        Formatted string for embed field, or empty string if no plays
    """
    if not plays:
        return ""

    key_plays_text = ""

    for play in plays:
        # Use the Play.descriptive_text() method (already includes score)
        play_description = play.descriptive_text(away_team, home_team)
        key_plays_text += f"{play_description}\n"

    return key_plays_text


async def set_channel_visibility(
    channel: discord.TextChannel, visible: bool, reason: Optional[str] = None
) -> bool:
    """
    Set channel visibility for @everyone.

    The bot's permissions are based on its role, not @everyone, so the bot
    will retain access even when @everyone view permission is removed.

    Args:
        channel: Discord text channel to modify
        visible: If True, grant @everyone view permission; if False, deny it
        reason: Optional reason for audit log

    Returns:
        True if permissions updated successfully, False otherwise
    """
    try:
        guild = channel.guild
        everyone_role = guild.default_role

        if visible:
            # Grant @everyone permission to view channel
            default_reason = "Channel made visible to all members"
            await channel.set_permissions(
                everyone_role, view_channel=True, reason=reason or default_reason
            )
            logger.info(f"Set #{channel.name} to VISIBLE for @everyone")
        else:
            # Remove @everyone view permission
            default_reason = "Channel hidden from members"
            await channel.set_permissions(
                everyone_role, view_channel=False, reason=reason or default_reason
            )
            logger.info(f"Set #{channel.name} to HIDDEN for @everyone")

        return True

    except discord.Forbidden:
        logger.error(f"Missing permissions to modify #{channel.name} permissions")
        return False
    except Exception as e:
        logger.error(f"Error setting channel visibility for #{channel.name}: {e}")
        return False