import discord
import yt_dlp
import asyncio
import os
import json
import random
import requests
from dotenv import load_dotenv

load_dotenv()

voice_clients = {}  # Track active voice connections
music_queues = {}  # Per-guild song queue
current_tracks = {}  # Currently playing tracks
volumes = {}  # Volume levels per guild
repeat_modes = {}  # Tracks repeat mode per guild: "one", "all", or "off"
default_volume = 0.05  # Default volume (5%)
USER_DATA_FILE = 'user_data.json'
YOUTUBE_API_KEY = os.getenv("YOUTUBE_API_KEY")  # Replace with your API key


# ---------- Utility Functions ----------
def load_user_data():
    if not os.path.exists(USER_DATA_FILE):
        return {}
    with open(USER_DATA_FILE, 'r') as f:
        return json.load(f)


def save_user_data(data):
    with open(USER_DATA_FILE, 'w') as f:
        json.dump(data, f, indent=4)


def update_user_history(user_id, song_title, artist):
    user_data = load_user_data()
    if str(user_id) not in user_data:
        user_data[str(user_id)] = {"history": []}

    # Add the song to the user's history
    user_data[str(user_id)]["history"].append({"title": song_title, "artist": artist})
    save_user_data(user_data)


# ---------- Playback Functions ----------
async def join_voice(interaction: discord.Interaction):
    if interaction.user.voice is None or interaction.user.voice.channel is None:
        await interaction.response.send_message("You need to be in a voice channel for me to join.")
        return None

    channel = interaction.user.voice.channel
    guild_id = interaction.guild.id

    if guild_id not in voice_clients:
        voice_clients[guild_id] = await channel.connect()

        # Ensure the response is completed
        if interaction.response.is_done():
            await interaction.followup.send(f"✅ **Joined {channel.name}.**")
        else:
            await interaction.response.send_message(f"✅ **Joined {channel.name}.**")
    return voice_clients[guild_id]


async def play_audio(interaction: discord.Interaction, query: str):
    guild_id = interaction.guild.id

    # Ensure Amber is connected to a voice channel
    if guild_id not in voice_clients or not voice_clients[guild_id].is_connected():
        await interaction.response.defer()  # Defer the response early
        voice_client = await join_voice(interaction)
        if voice_client is None:  # If join failed
            return
    else:
        voice_client = voice_clients[guild_id]

    # Defer response if not already done
    if not interaction.response.is_done():
        await interaction.response.defer()

    # Search for the song on YouTube
    ydl_opts = {
        'format': 'bestaudio/best',
        'quiet': True,
    }
    with yt_dlp.YoutubeDL(ydl_opts) as ydl:
        try:
            info = ydl.extract_info(f"ytsearch:{query}", download=False)['entries'][0]
        except Exception as e:
            await interaction.followup.send(f"Failed to find or play the requested audio. Error: {str(e)}")
            return

    song_url = info['url']
    title = info.get('title', 'Unknown Title')
    artist = info.get('uploader', 'Unknown Artist')

    # Log the song in the user's history
    update_user_history(interaction.user.id, title, artist)

    # Add the song to the queue
    if guild_id not in music_queues:
        music_queues[guild_id] = []

    music_queues[guild_id].append((song_url, title))
    await interaction.followup.send(f"✅ **Added to queue:** {title}")

    # If nothing is playing, start playback
    if not voice_client.is_playing():
        await play_next(interaction)


async def play_next(interaction: discord.Interaction):
    guild_id = interaction.guild.id

    if guild_id not in music_queues:
        music_queues[guild_id] = []

    # Handle Repeat One
    if repeat_modes.get(guild_id) == "one" and current_tracks.get(guild_id):
        song_url, title = current_tracks[guild_id]
        music_queues[guild_id].insert(0, (song_url, title))  # Re-add the current song to the front of the queue

    # Handle Repeat All
    elif repeat_modes.get(guild_id) == "all" and not music_queues[guild_id]:
        # Move completed songs back to the queue
        song_url, title = current_tracks.get(guild_id, (None, None))
        if song_url and title:
            music_queues[guild_id].append((song_url, title))
            music_queues[guild_id].extend(current_tracks.values())

    # Proceed to play the next song
    if not music_queues[guild_id]:
        await interaction.followup.send("❌ **No more songs in the queue.**")
        return

    voice_client = voice_clients[guild_id]
    song_url, title = music_queues[guild_id].pop(0)
    current_tracks[guild_id] = (song_url, title)

    # Prepare FFmpeg options
    ffmpeg_options = {
        'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
        'options': '-vn',
    }

    try:
        source = discord.FFmpegPCMAudio(song_url, **ffmpeg_options)
        volume = volumes.get(guild_id, default_volume)
        source = discord.PCMVolumeTransformer(source, volume=volume)

        # Play the audio
        voice_client.play(
            source,
            after=lambda e: asyncio.run_coroutine_threadsafe(
                play_next(interaction), interaction.client.loop
            ),
        )

        await interaction.followup.send(f"🎵 **Now playing:** {title}")
    except Exception as e:
        await interaction.followup.send(f"Failed to play the next song. Error: {str(e)}")


async def stop_audio(interaction: discord.Interaction):
    guild_id = interaction.guild.id

    if guild_id in voice_clients:
        voice_client = voice_clients[guild_id]
        if voice_client.is_playing():
            voice_client.stop()
        music_queues[guild_id] = []  # Clear the queue
        current_tracks.pop(guild_id, None)  # Remove the current track
        await interaction.response.send_message("🛑 **Playback stopped and queue cleared.**")
    else:
        await interaction.response.send_message("❌ **No music is playing.**")


async def pause_audio(interaction: discord.Interaction):
    """Pauses the currently playing song."""
    guild_id = interaction.guild.id

    if guild_id in voice_clients and voice_clients[guild_id].is_playing():
        voice_clients[guild_id].pause()  # Pause playback
        await interaction.response.send_message("⏸️ **Music paused.**")
    else:
        await interaction.response.send_message("❌ **No music is currently playing.**")


async def resume_audio(interaction: discord.Interaction):
    """Resumes playback of a paused song."""
    guild_id = interaction.guild.id

    if guild_id in voice_clients and voice_clients[guild_id].is_paused():
        voice_clients[guild_id].resume()  # Resume playback
        await interaction.response.send_message("▶️ **Music resumed.**")
    else:
        await interaction.response.send_message("❌ **No paused music to resume.**")


async def set_volume(interaction: discord.Interaction, level: int):
    guild_id = interaction.guild.id

    if level < 0 or level > 100:
        await interaction.response.send_message("❌ **Volume must be between 0 and 100.**")
        return

    # Set the volume
    volume = level / 100
    volumes[guild_id] = volume

    # Adjust volume for the current source if playing
    if guild_id in voice_clients and voice_clients[guild_id].is_playing():
        source = voice_clients[guild_id].source
        if isinstance(source, discord.PCMVolumeTransformer):
            source.volume = volume

    await interaction.response.send_message(f"🔊 **Volume set to {level}%**.")


async def leave_voice(interaction: discord.Interaction):
    guild_id = interaction.guild.id

    if guild_id in voice_clients:
        voice_client = voice_clients[guild_id]
        if voice_client.is_connected():
            await voice_client.disconnect()
            voice_clients.pop(guild_id, None)
            await interaction.response.send_message("👋 **Left the voice channel.**")
        else:
            await interaction.response.send_message("❌ **I am not connected to any voice channel.**")
    else:
        await interaction.response.send_message("❌ **I am not connected to any voice channel.**")


# ---------- Recommendations ----------
def fetch_related_songs(song_title, artist):
    """
    Fetch related songs using the YouTube Data API v3.
    Returns a list of recommendations in the format:
    [ "Title - URL" ]
    """
    query = f"{song_title} {artist} related songs"
    url = "https://www.googleapis.com/youtube/v3/search"
    params = {
        "q": query,
        "key": YOUTUBE_API_KEY,
        "type": "video",
        "part": "snippet",
        "maxResults": 5
    }

    response = requests.get(url, params=params)
    if response.status_code == 200:
        data = response.json()
        return [
            f'{item["snippet"]["title"]} - https://www.youtube.com/watch?v={item["id"]["videoId"]}'
            for item in data.get("items", [])
        ]
    else:
        print(f"Error fetching related songs: {response.status_code} {response.text}")
        return []


def generate_recommendations(user_id):
    """
    Generate recommendations using the last song the user listened to.
    """
    user_data = load_user_data()
    user_history = user_data.get(str(user_id), {}).get("history", [])

    if not user_history:
        return ["No recommendations yet. Start playing some songs!"]

    # Use the last played song to fetch recommendations
    last_song = user_history[-1]
    title = last_song["title"]
    artist = last_song["artist"]
    recommendations = fetch_related_songs(title, artist)

    if recommendations:
        return recommendations
    else:
        return ["No recommendations could be fetched at this time."]