"""Discord bot implementation for MyOrg Assistant."""
import discord
from discord.ext import commands
from typing import Optional
from src.config import settings
from src.agent.core import MyOrgAgent
from src.agent.prompts import get_system_prompt
from src.tools.file_ops import get_file_operation_tools
from src.tools.task_ops import get_task_management_tools
from src.tools.calendar_ops import get_calendar_tools
from src.tools.git_ops import get_git_tools
from src.bot.formatters import format_response_for_discord


class MyOrgBot(commands.Bot):
    """Discord bot for MyOrg Assistant."""
    
    def __init__(self) -> None:
        """Initialize the bot."""
        # Set up intents
        intents = discord.Intents.default()
        intents.message_content = True
        intents.members = True
        
        # Initialize bot
        super().__init__(
            command_prefix='/',
            intents=intents,
            help_command=None,  # We'll create our own
        )
        
        # Initialize agent
        self.agent = MyOrgAgent(
            system_prompt=get_system_prompt(),
            tools=(
                get_file_operation_tools() +
                get_task_management_tools() +
                get_calendar_tools() +
                get_git_tools()
            ),
        )
        
        # Track user sessions (one agent per user)
        self.user_agents: dict[int, MyOrgAgent] = {}
    
    def get_user_agent(self, user_id: int) -> MyOrgAgent:
        """Get or create an agent for a specific user.
        
        Args:
            user_id: Discord user ID
        
        Returns:
            MyOrgAgent instance for this user
        """
        if user_id not in self.user_agents:
            self.user_agents[user_id] = MyOrgAgent(
                system_prompt=get_system_prompt(),
                tools=(
                    get_file_operation_tools() +
                    get_task_management_tools() +
                    get_calendar_tools() +
                    get_git_tools()
                ),
            )
        return self.user_agents[user_id]
    
    async def on_ready(self) -> None:
        """Called when bot is ready."""
        print(f'✅ Logged in as {self.user}')
        print(f'📊 Connected to {len(self.guilds)} server(s)')
        print(f'🤖 Agent initialized with {len(self.agent.tools)} tools')
        print('🎉 MyOrg Assistant is ready!')
    
    async def on_message(self, message: discord.Message) -> None:
        """Handle incoming messages.
        
        Args:
            message: Discord message object
        """
        # Ignore messages from the bot itself
        if message.author == self.user:
            return
        
        # Ignore messages not mentioning the bot (unless in DM)
        if not isinstance(message.channel, discord.DMChannel):
            if not self.user.mentioned_in(message):
                return
        
        # Process commands first
        await self.process_commands(message)
        
        # If message wasn't a command, treat as natural conversation
        if not message.content.startswith('/'):
            await self.handle_conversation(message)
    
    async def handle_conversation(self, message: discord.Message) -> None:
        """Handle natural language conversation.
        
        Args:
            message: Discord message object
        """
        # Remove bot mention from message
        content = message.content
        if self.user.mentioned_in(message):
            content = content.replace(f'<@{self.user.id}>', '').strip()
        
        if not content:
            return
        
        # Show typing indicator
        async with message.channel.typing():
            try:
                # Get user's agent
                agent = self.get_user_agent(message.author.id)
                
                # Process message
                response = agent.run(content)
                
                # Format and send response
                formatted = format_response_for_discord(response)
                
                # Split if too long (Discord limit is 2000 chars)
                if len(formatted) <= 2000:
                    await message.reply(formatted)
                else:
                    # Split into chunks
                    chunks = [formatted[i:i+1900] for i in range(0, len(formatted), 1900)]
                    for chunk in chunks:
                        await message.channel.send(chunk)
            
            except Exception as e:
                await message.reply(f'❌ Error: {str(e)}')
    
    async def setup_hook(self) -> None:
        """Set up bot commands."""
        # Commands will be added via decorators below
        pass


# Create bot instance
bot = MyOrgBot()


@bot.command(name='help')
async def help_command(ctx: commands.Context) -> None:
    """Show help information."""
    help_text = """
**🤖 MyOrg Assistant - Help**

**Natural Conversation:**
Just mention me or DM me to interact naturally!
- "Add task: Buy milk tomorrow"
- "What should I work on now?"
- "Show my tasks for project myorg-assistant"

**Commands:**
`/help` - Show this help message
`/briefing` - Get daily briefing (calendar + priority tasks)
`/add [task]` - Quick task addition
`/tasks [filter]` - Show tasks (optionally filtered)
`/today` - Today's calendar and priority tasks
`/context [context]` - Set your current context
`/reset` - Clear conversation history

**Examples:**
`/add Buy groceries @recados due:2026-02-01`
`/tasks project:myorg-assistant`
`/context computer-deep`

**Contexts:**
`@computer-deep` - Deep focus work
`@computer-light` - Light computer work
`@telefon` - Calls/meetings
`@recados` - Errands
`@bcn` - Barcelona location
`@personal` - Personal activities
"""
    await ctx.send(help_text)


@bot.command(name='briefing')
async def briefing_command(ctx: commands.Context) -> None:
    """Get daily briefing."""
    async with ctx.typing():
        try:
            agent = bot.get_user_agent(ctx.author.id)
            
            prompt = """Generate a morning briefing for today:
1. Read calendar.txt and show today's events
2. Read todo.txt and show priority A and B tasks
3. Show tasks with due dates in the next 3 days
4. Format as a nice daily briefing"""
            
            response = agent.run(prompt)
            formatted = format_response_for_discord(response)
            await ctx.send(formatted)
        
        except Exception as e:
            await ctx.send(f'❌ Error generating briefing: {str(e)}')


@bot.command(name='add')
async def add_command(ctx: commands.Context, *, task: str) -> None:
    """Quick task addition.
    
    Args:
        task: Task description with optional metadata
    """
    async with ctx.typing():
        try:
            agent = bot.get_user_agent(ctx.author.id)
            
            prompt = f"""Add this task to todo.txt: {task}
Parse the task description and extract:
- Description (main text)
- Project tags (words starting with +)
- Context tags (words starting with @)
- Due date (due:YYYY-MM-DD format)
- Priority if implied

Then add the task using the add_task tool and commit the change."""
            
            response = agent.run(prompt)
            formatted = format_response_for_discord(response)
            await ctx.send(formatted)
        
        except Exception as e:
            await ctx.send(f'❌ Error adding task: {str(e)}')


@bot.command(name='tasks')
async def tasks_command(ctx: commands.Context, *, filters: Optional[str] = None) -> None:
    """Show tasks with optional filters.
    
    Args:
        filters: Optional filter string (e.g., "project:myorg-assistant context:computer-deep")
    """
    async with ctx.typing():
        try:
            agent = bot.get_user_agent(ctx.author.id)
            
            if filters:
                prompt = f"""Show tasks from todo.txt with these filters: {filters}
Parse the filter string and use the search_tasks tool appropriately."""
            else:
                prompt = "Show all active tasks from todo.txt grouped by priority using get_tasks_by_priority tool."
            
            response = agent.run(prompt)
            formatted = format_response_for_discord(response)
            await ctx.send(formatted)
        
        except Exception as e:
            await ctx.send(f'❌ Error fetching tasks: {str(e)}')


@bot.command(name='today')
async def today_command(ctx: commands.Context) -> None:
    """Show today's calendar and priority tasks."""
    async with ctx.typing():
        try:
            agent = bot.get_user_agent(ctx.author.id)
            
            prompt = """Show me what's on for today:
1. Read calendar.txt and show today's events
2. Read todo.txt and show priority A tasks
3. Show any tasks due today
4. Format as a concise daily overview"""
            
            response = agent.run(prompt)
            formatted = format_response_for_discord(response)
            await ctx.send(formatted)
        
        except Exception as e:
            await ctx.send(f'❌ Error: {str(e)}')


@bot.command(name='context')
async def context_command(ctx: commands.Context, context: str) -> None:
    """Set current context.
    
    Args:
        context: Context name (without @ prefix)
    """
    # For now, just acknowledge. In Phase 3, we'll track this
    await ctx.send(f'✅ Context set to `@{context}`')


@bot.command(name='reset')
async def reset_command(ctx: commands.Context) -> None:
    """Reset conversation history."""
    agent = bot.get_user_agent(ctx.author.id)
    agent.reset_conversation()
    await ctx.send('🔄 Conversation history cleared!')


def run_bot() -> None:
    """Run the Discord bot."""
    if not settings.discord_bot_token:
        raise ValueError("DISCORD_BOT_TOKEN not set in environment")
    
    print("🚀 Starting MyOrg Discord Bot...")
    bot.run(settings.discord_bot_token)