import discord

async def _find_category(guild, category_params):
    """Find a category by ID first, then by name (case-insensitive)."""
    category_id = category_params.get('category_id')
    if category_id:
        try:
            cat = guild.get_channel(int(category_id))
            if cat and isinstance(cat, discord.CategoryChannel):
                return cat
        except (ValueError, TypeError):
            pass
    
    category_name = category_params.get('category_name')
    if not category_name:
        return None
    
    return discord.utils.find(lambda cat: cat.name.casefold() == category_name.casefold(), guild.categories)

async def execute(bot, params, message):
    categories = params.get('categories', [])
    if not categories:
        # Fallback for single category
        categories = [params]
    guild = message.guild
    renamed_count = 0
    for category_params in categories:
        category_name = category_params.get('category_name')
        new_name = category_params.get('new_name')
        
        category = await _find_category(guild, category_params)
        if not category:
            label = category_name or category_params.get('category_id', 'inconnue')
            await message.channel.send(f"Catégorie '{label}' introuvable.")
            continue
        try:
            await category.edit(name=new_name)
            renamed_count += 1
        except discord.Forbidden:
            label = category_name or category_params.get('category_id', 'inconnue')
            await message.channel.send(f"Je n'ai pas les permissions pour renommer la catégorie '{label}'.")
    if renamed_count > 0:
        await message.channel.send(f"{renamed_count} catégorie(s) renommée(s).")