import asyncio
import json
from datetime import datetime
from pathlib import Path
from typing import Dict, Optional

import aiohttp
import discord
from redbot.core import Config, commands
from redbot.core.bot import Red
from redbot.core.utils.chat_formatting import box, humanize_list


class RepoUpdates(commands.Cog):
    """Monitor cog repositories for updates and post notifications."""

    def __init__(self, bot: Red):
        self.bot = bot
        self.config = Config.get_conf(self, identifier=8927348923)
        self.session = aiohttp.ClientSession()
        self.bg_task = None
        
        default_global = {
            "check_interval": 300,  # 5 minutes in seconds
            "channel_id": None,
            "repos": {}  # Dict[str, Dict[str, str]] - repo_url: {last_commit: str}
        }
        
        self.config.register_global(**default_global)

    def cog_unload(self):
        if self.bg_task:
            self.bg_task.cancel()
        asyncio.create_task(self.session.close())

    async def initialize(self):
        """Start the background task."""
        self.bg_task = self.bot.loop.create_task(self.check_updates_loop())

    @commands.group()
    @commands.admin_or_permissions(administrator=True)
    async def repoupdate(self, ctx: commands.Context):
        """Commands for repository update notifications."""
        pass

    @repoupdate.command()
    async def channel(self, ctx: commands.Context, channel: discord.TextChannel):
        """Set the channel for repository update notifications."""
        await self.config.channel_id.set(channel.id)
        await ctx.send(f"Update notifications will be sent to {channel.mention}")

    @repoupdate.command()
    async def interval(self, ctx: commands.Context, seconds: int):
        """Set how often to check for updates (in seconds)."""
        if seconds < 60:
            await ctx.send("Interval must be at least 60 seconds.")
            return
        await self.config.check_interval.set(seconds)
        await ctx.send(f"Update check interval set to {seconds} seconds.")

    @repoupdate.command()
    async def addrepo(self, ctx: commands.Context, name: str, repo_url: str):
        """Add a repository to monitor."""
        async with self.config.repos() as repos:
            if name in repos:
                await ctx.send("A repository with that name already exists.")
                return
            
            # Validate the repo URL and get the latest commit
            try:
                api_url = repo_url.replace("github.com", "api.github.com/repos")
                if api_url.endswith("/"):
                    api_url = api_url[:-1]
                api_url += "/commits"
                
                async with self.session.get(api_url) as resp:
                    if resp.status != 200:
                        await ctx.send("Failed to fetch repository information. Please check the URL.")
                        return
                    commits = await resp.json()
                    if not commits:
                        await ctx.send("No commits found in the repository.")
                        return
                    latest_commit = commits[0]["sha"]
                
                repos[name] = {
                    "url": repo_url,
                    "last_commit": latest_commit
                }
                await ctx.send(f"Added repository: {name}")
            except Exception as e:
                await ctx.send(f"Error adding repository: {str(e)}")

    @repoupdate.command()
    async def removerepo(self, ctx: commands.Context, name: str):
        """Remove a repository from monitoring."""
        async with self.config.repos() as repos:
            if name not in repos:
                await ctx.send("Repository not found.")
                return
            del repos[name]
            await ctx.send(f"Removed repository: {name}")

    @repoupdate.command()
    async def listrepos(self, ctx: commands.Context):
        """List all monitored repositories."""
        repos = await self.config.repos()
        if not repos:
            await ctx.send("No repositories are being monitored.")
            return
        
        msg = "Monitored Repositories:\n"
        for name, data in repos.items():
            msg += f"\n• {name}: {data['url']}"
        
        await ctx.send(box(msg))

    async def check_updates_loop(self):
        """Background loop to check for repository updates."""
        await self.bot.wait_until_ready()
        while True:
            try:
                await self.check_updates()
            except Exception as e:
                print(f"Error checking updates: {str(e)}")
            
            interval = await self.config.check_interval()
            await asyncio.sleep(interval)

    async def check_updates(self):
        """Check all repositories for updates."""
        channel_id = await self.config.channel_id()
        if not channel_id:
            return
        
        channel = self.bot.get_channel(channel_id)
        if not channel:
            return
        
        async with self.config.repos() as repos:
            for name, data in repos.items():
                try:
                    api_url = data["url"].replace("github.com", "api.github.com/repos")
                    if api_url.endswith("/"):
                        api_url = api_url[:-1]
                    api_url += "/commits"
                    
                    async with self.session.get(api_url) as resp:
                        if resp.status != 200:
                            continue
                        commits = await resp.json()
                        if not commits:
                            continue
                        
                        latest_commit = commits[0]["sha"]
                        if latest_commit != data["last_commit"]:
                            # Get the changes
                            changes = []
                            for commit in commits:
                                if commit["sha"] == data["last_commit"]:
                                    break
                                changes.append(f"• {commit['commit']['message']}")
                            
                            # Create and send the update embed
                            embed = discord.Embed(
                                title=f"Repository Update: {name}",
                                url=data["url"],
                                color=discord.Color.green(),
                                timestamp=datetime.now()
                            )
                            
                            if changes:
                                embed.add_field(
                                    name="Changes",
                                    value="\n".join(changes[:10]),  # Show up to 10 changes
                                    inline=False
                                )
                                if len(changes) > 10:
                                    embed.set_footer(text=f"And {len(changes) - 10} more changes...")
                            
                            await channel.send(embed=embed)
                            data["last_commit"] = latest_commit
                            
                except Exception as e:
                    print(f"Error checking repository {name}: {str(e)}")
                    continue