"""Messaging utilities for Superviseur bot."""

import discord
import logging
from typing import Optional, List, Dict

logger = logging.getLogger('Superviseur')


class MessagingManager:
    """Manages message sending with rate limiting and chunking."""
    
    def __init__(self, bot):
        self.bot = bot
    
    async def send_message_with_limit(
        self, 
        channel: discord.abc.Messageable, 
        content: str
    ) -> None:
        """Send a message, splitting into multiple if it exceeds 2000 chars."""
        while len(content) > 2000:
            split_index = content.rfind(' ', 0, 2000)
            if split_index == -1:
                split_index = 2000
            chunk = content[:split_index]
            await channel.send(chunk)
            content = content[split_index:].lstrip()
        if content:
            await channel.send(content)
    
    async def reply_with_limit(
        self, 
        message: discord.Message, 
        content: str
    ) -> None:
        """Reply to a message, splitting if it exceeds 2000 chars."""
        if not message.channel:
            logger.warning(f"Cannot send message: no channel")
            return
        
        if hasattr(message.channel, 'permissions_for'):
            perms = message.channel.permissions_for(
                message.guild.me if message.guild else message.author
            )
            if not perms.send_messages:
                logger.warning(f"Cannot send message in channel {message.channel}")
                return
        
        first_chunk = True
        
        while len(content) > 2000:
            split_index = content.rfind(' ', 0, 2000)
            if split_index == -1:
                split_index = 2000
            chunk = content[:split_index]
            
            if first_chunk:
                try:
                    await message.reply(chunk)
                except (discord.errors.HTTPException, discord.errors.NotFound):
                    try:
                        await message.channel.send(chunk)
                    except discord.errors.Forbidden:
                        logger.error(f"Forbidden to send in channel {message.channel}")
                first_chunk = False
            else:
                try:
                    await message.channel.send(chunk)
                except discord.errors.Forbidden:
                    logger.error(f"Forbidden to send in channel {message.channel}")
                    return
            
            content = content[split_index:].lstrip()
        
        if content:
            if first_chunk:
                try:
                    await message.reply(content)
                except (discord.errors.HTTPException, discord.errors.NotFound):
                    try:
                        await message.channel.send(content)
                    except discord.errors.Forbidden:
                        logger.error(f"Forbidden to send in channel {message.channel}")
            else:
                try:
                    await message.channel.send(content)
                except discord.errors.Forbidden:
                    logger.error(f"Forbidden to send in channel {message.channel}")
    
    async def send_embed(
        self,
        target: discord.abc.Messageable,
        title: str,
        description: str,
        color: discord.Color = discord.Color.light_grey(),
        thumbnail_url: Optional[str] = None,
        is_asset: bool = False,
        fields: Optional[List[Dict[str, str]]] = None
    ) -> None:
        """Send a clinical Samaritan-style embed with support for fields and clickable links."""
        # Clinical formatting - we avoid the global ``` to allow markdown (links, mentions)
        display_title = f"◈ {title} ◈"
        
        embed = discord.Embed(
            title=display_title,
            description=description,
            color=color
        )
        
        if fields:
            for field in fields:
                embed.add_field(
                    name=field.get("name", "---"), 
                    value=field.get("value", "---"), 
                    inline=field.get("inline", True)
                )
        
        if is_asset:
            embed.set_author(
                name="SYSTEM: BÊTA | PRIMARY ASSET LINK", 
                icon_url="https://i.imgur.com/xH3X5rR.png"
            )
            
        if thumbnail_url:
            embed.set_thumbnail(url=thumbnail_url)
            
        embed.set_footer(text=f"HEURISTIC ANALYSIS COMPLETE | {self.bot.system_name} v2.0")
        
        try:
            await target.send(embed=embed)
        except discord.errors.Forbidden:
            logger.error(f"Cannot send DM/Message to {target}")