import traceback
import logging
from typing import Optional, Union
from regex import Pattern
import discord
import regex
from util.sing_util import Utility
from discord.ext import bridge, commands
from disc_havoc import Havoc
import random
import string
import json
import os

BOT_CHANIDS = []

# Global storage for pagination data (survives across interactions)
PAGINATION_DATA = {}
PAGINATION_FILE = "pagination_data.json"

def load_pagination_data():
    """Load pagination data from JSON file"""
    global PAGINATION_DATA
    try:
        if os.path.exists(PAGINATION_FILE):
            with open(PAGINATION_FILE, 'r') as f:
                PAGINATION_DATA = json.load(f)
    except Exception:
        PAGINATION_DATA = {}

def save_pagination_data():
    """Save pagination data to JSON file (excluding non-serializable embeds)"""
    try:
        # Create serializable copy without embeds
        serializable_data = {}
        for key, value in PAGINATION_DATA.items():
            serializable_data[key] = {
                "pages": value["pages"],
                "song": value["song"], 
                "artist": value["artist"],
                "total_pages": value["total_pages"]
            }
        with open(PAGINATION_FILE, 'w') as f:
            json.dump(serializable_data, f)
    except Exception:
        pass
import logging
from typing import Optional, Union
from regex import Pattern
import discord
import regex
from util.sing_util import Utility
from discord.ext import bridge, commands
from disc_havoc import Havoc
import random
import string

BOT_CHANIDS = []

# Global storage for pagination data (survives across interactions)
PAGINATION_DATA: dict[str, dict] = {}


class LyricsPaginator(discord.ui.View):
    def __init__(self, pages, song, artist):
        super().__init__(timeout=None)  # No timeout - buttons work permanently
        self.pages = pages
        self.song = song
        self.artist = artist
        self.current_page = 0
        
        # Generate a unique ID for this paginator instance  
        self.custom_id_base = ''.join(random.choices(string.ascii_letters + string.digits, k=16))
        
        # Pre-generate all embeds to avoid creating them on each page turn
        self.embeds = []
        
        # URL encode artist and song for the link
        import urllib.parse
        encoded_artist = urllib.parse.quote(self.artist, safe='')
        encoded_song = urllib.parse.quote(self.song, safe='')
        lyrics_url = f"https://codey.lol/#{encoded_artist}/{encoded_song}"
        
        for i, page in enumerate(pages):
            embed = discord.Embed(title=f"{self.song}", color=discord.Color.blue(), url=lyrics_url)
            embed.set_author(name=self.artist)
            embed.description = page
            
            # Set footer with just page info for multi-page, or no footer for single page
            if len(pages) > 1:
                embed.set_footer(text=f"Page {i + 1} of {len(pages)}", icon_url="https://codey.lol/favicon.ico")
            self.embeds.append(embed)

        # Store pagination data for persistence across bot restarts
        if len(pages) > 1:
            # Store data (embeds will be recreated as needed since they can't be JSON serialized)
            serializable_data = {
                "pages": pages,
                "song": song, 
                "artist": artist,
                "total_pages": len(pages)
            }
            # Store in memory with embeds for performance
            PAGINATION_DATA[self.custom_id_base] = {
                **serializable_data,
                "embeds": self.embeds
            }
            # Save serializable data to file
            save_pagination_data()

    def get_view_for_page(self, page_num: int):
        """Create a view with properly configured buttons for the given page"""
        view = discord.ui.View(timeout=None)
        
        if len(self.pages) > 1:
            # Previous button
            prev_button = discord.ui.Button(
                label="Previous",
                style=discord.ButtonStyle.secondary,
                emoji="⬅️",
                disabled=(page_num == 0),
                custom_id=f"lyrics_prev:{self.custom_id_base}",
                row=0
            )
            
            # Next button  
            next_button = discord.ui.Button(
                label="Next",
                style=discord.ButtonStyle.primary,
                emoji="➡️", 
                disabled=(page_num == len(self.pages) - 1),
                custom_id=f"lyrics_next:{self.custom_id_base}",
                row=0
            )
            
            view.add_item(prev_button)
            view.add_item(next_button)
            
        return view


class Sing(commands.Cog):
    """Sing Cog for Havoc"""

    def __init__(self, bot: Havoc) -> None:
        self.bot: Havoc = bot
        self.utility = Utility()
        global BOT_CHANIDS
        BOT_CHANIDS = self.bot.BOT_CHANIDS  # Inherit
        self.control_strip_regex: Pattern = regex.compile(
            r"\x0f|\x1f|\035|\002|\u2064|\x02|(\x03([0-9]{1,2}))|(\x03|\003)(?:\d{1,2}(?:,\d{1,2})?)?",
            regex.UNICODE,
        )
        
        # Persistent interactions handled by on_interaction listener

    @commands.Cog.listener()
    async def on_interaction(self, interaction: discord.Interaction):
        """Handle persistent lyrics pagination interactions"""
        if interaction.type != discord.InteractionType.component:
            return
            
        custom_id = interaction.data.get("custom_id", "")
        if not (custom_id.startswith("lyrics_prev:") or custom_id.startswith("lyrics_next:")):
            return
            
        try:
            # Extract the base custom ID and direction
            if custom_id.startswith("lyrics_prev:"):
                direction = -1
                base_id = custom_id.replace("lyrics_prev:", "")
            else:  # lyrics_next:
                direction = 1
                base_id = custom_id.replace("lyrics_next:", "")
            
            # Get pagination data from JSON persistence 
            data = PAGINATION_DATA.get(base_id)
            if not data:
                await interaction.response.send_message(
                    "⚠️ **Navigation Expired**\n"
                    "These buttons are from a previous session. "
                    "Use `/s <song>` or `/sing <artist> : <song>` to get fresh lyrics!", 
                    ephemeral=True,
                )
                return
                
            # Recreate embeds if they don't exist (loaded from JSON)
            if "embeds" not in data or not data["embeds"]:
                paginator = LyricsPaginator(data["pages"], data["song"], data["artist"])
                paginator.custom_id_base = base_id
                data["embeds"] = paginator.embeds
                # Update in-memory data
                PAGINATION_DATA[base_id] = data
            
            # Get current page from embed footer
            if not interaction.message or not interaction.message.embeds:
                await interaction.response.defer()
                return
            current_embed = interaction.message.embeds[0]
            footer_text = current_embed.footer.text if current_embed.footer else ""
            
            # Extract current page number (format: "Page X of Y")
            current_page = 0
            if "Page " in footer_text and " of " in footer_text:
                try:
                    page_part = footer_text.split("Page ")[1].split(" of ")[0]
                    current_page = int(page_part) - 1
                except:
                    pass
            
            # Calculate new page
            new_page = current_page + direction
            total_pages = len(data["pages"])
            
            if new_page < 0 or new_page >= total_pages:
                await interaction.response.defer()  # Just acknowledge, don't change anything
                return
            
            # Create new paginator and get view for new page
            paginator = LyricsPaginator(data["pages"], data["song"], data["artist"])
            paginator.custom_id_base = base_id  # Preserve same custom ID
            view = paginator.get_view_for_page(new_page)
            
            # Update the message
            await interaction.response.edit_message(embed=data["embeds"][new_page], view=view)
            
        except Exception as e:
            try:
                await interaction.response.send_message(f"Error handling pagination: {str(e)}", ephemeral=True)
            except:
                pass

    def is_spamchan():  # type: ignore
        """Check if channel is spam chan"""

        def predicate(ctx):
            try:
                if ctx.channel.id not in BOT_CHANIDS:
                    logging.debug("%s not found in %s", ctx.channel.id, BOT_CHANIDS)
                return ctx.channel.id in BOT_CHANIDS
            except Exception as e:
                logging.debug("Exception: %s", str(e))
                traceback.print_exc()
                return False

        return commands.check(predicate)

    @bridge.bridge_command(aliases=["sing"])
    async def s(self, ctx, *, song: Optional[str] = None) -> None:
        """
        Search for lyrics, format is artist : song.  Also reads activity.
        """
        try:
            with ctx.channel.typing():
                activity: Optional[discord.Activity] = None
                if not song:
                    if not ctx.author.activities:
                        return

                    for _activity in ctx.author.activities:
                        if _activity.type == discord.ActivityType.listening:
                            activity = _activity

                    if not activity:
                        return await ctx.respond(
                            "**Error**: No song specified, no activity found to read."
                        )

                # Initial response that we'll edit later
                message = await ctx.respond("*Searching for lyrics...*")

                parsed = self.utility.parse_song_input(song, activity)

                if isinstance(parsed, tuple):
                    (search_artist, search_song, search_subsearch) = parsed
                    # Update the message to show what we're searching for
                    await message.edit(content=f"*Searching for '{search_song}' by {search_artist}...*")

                search_result: Optional[list] = await self.utility.lyric_search(
                    search_artist, search_song, search_subsearch, is_spam_channel=(ctx.channel.id in BOT_CHANIDS)
                )

                if not search_result:
                    await ctx.respond("ERR: No search result.")
                    return

                if len(search_result) == 1:
                    # Error response from API
                    error, *_ = search_result[0]
                    return await ctx.respond(error)
                if not isinstance(search_result[0], tuple):
                    return  # Invalid data type
                (
                    search_result_artist,
                    search_result_song,
                    search_result_src,
                    search_result_confidence,
                    search_result_time_taken,
                ) = search_result[0]  #  First index is a tuple
                search_result_wrapped: list[str] = search_result[
                    1
                ]  # Second index is the wrapped lyrics
                search_result_wrapped_short: list[str] = search_result[
                    2
                ]  # Third is short wrapped lyrics
                # Now all channels get full pagination - removed the early return restriction

                # Use the appropriate wrapped lyrics based on channel type
                is_spam_channel = ctx.channel.id in BOT_CHANIDS
                if is_spam_channel:
                    # Spam channels get full-length lyrics
                    pages = search_result_wrapped.copy()
                else:
                    # Non-spam channels get shorter lyrics for better UX
                    pages = search_result_wrapped.copy()  # For now, still use full but we'll modify limits later

                # Add source info to last page
                if pages:
                    pages[-1] += f"\n\n`Found on: {search_result_src}`"

                # Create and send view with paginator
                paginator = LyricsPaginator(pages, search_result_song, search_result_artist)
                view = paginator.get_view_for_page(0)
                # Edit the existing message to show the lyrics
                await message.edit(content=None, embed=paginator.embeds[0], view=view)
        except Exception as e:
            traceback.print_exc()
            await ctx.respond(f"ERR: {str(e)}")

    @commands.user_command(name="Sing")
    async def sing_context_menu(self, ctx, member: discord.Member) -> None:
        """
        Sing Context Menu Command

        Args:
            ctx (Any): Discord context
            member (discord.Member): Discord member
        Returns:
            None
        """
        try:
            PODY_ID: int = 1172340700663255091
            IS_SPAMCHAN: bool = ctx.channel.id in BOT_CHANIDS
            member_display = ctx.interaction.guild.get_member(member.id).display_name
            if (
                not (ctx.interaction.guild.get_member(member.id).activities)
                and not member.id == PODY_ID
            ):
                return await ctx.respond(
                    f"No activity detected to read for {member_display}.",
                    ephemeral=True,
                )
            member_id: int = member.id  # if not(member.id == PODY_ID) else 1234134345497837679 # Use Thomas for Pody!
            activity: Optional[discord.Activity] = None
            # Initial response that we'll edit later
            message = await ctx.respond(f"*Reading activity of {member_display}...*" if IS_SPAMCHAN else "*Processing...*")

            for _activity in ctx.interaction.guild.get_member(member_id).activities:
                if _activity.type == discord.ActivityType.listening:
                    activity = _activity

            parsed: Union[tuple, bool] = self.utility.parse_song_input(
                song=None, activity=activity
            )
            if not parsed:
                if IS_SPAMCHAN:
                    return await message.edit(content=f"Could not parse activity of {member_display}.")
                else:
                    return await ctx.respond(
                        f"Could not parse activity of {member_display}.", ephemeral=True
                    )

            if isinstance(parsed, tuple):
                (search_artist, search_song, search_subsearch) = parsed
                await message.edit(content=f"*Searching for '{search_song}' by {search_artist}...*")
                search_result: Optional[list] = await self.utility.lyric_search(
                    search_artist, search_song, search_subsearch, is_spam_channel=(ctx.channel.id in BOT_CHANIDS)
                )
                if not search_result:
                    await ctx.respond("ERR: No search result")
                    return

                if len(search_result) == 1 and isinstance(search_result[0][0], str):
                    return await ctx.send(
                        "ERR: No search result"
                    )  # Error message from API

                (
                    search_result_artist,
                    search_result_song,
                    search_result_src,
                    search_result_confidence,
                    search_result_time_taken,
                ) = search_result[0]  #  First index is a tuple
                search_result_wrapped: list = search_result[
                    1
                ]  # Second index is the wrapped lyrics
                search_result_wrapped_short: list[str] = search_result[
                    2
                ]  # Third index is shortened lyrics

                # All channels now get full paginated response

                # Create paginator for lyrics
                if not search_result_wrapped:
                    return await ctx.respond("No lyrics found.")

                # Use the already smartly-wrapped pages from sing_util
                pages = search_result_wrapped.copy()  # Already processed by _smart_lyrics_wrap

                # Add source info to last page
                if pages:
                    pages[-1] += f"\n\n`Found on: {search_result_src}`"

                # Create and send view with paginator
                paginator = LyricsPaginator(pages, search_result_song, search_result_artist)
                view = paginator.get_view_for_page(0)
                # Edit the existing message to show the lyrics
                await message.edit(content=None, embed=paginator.embeds[0], view=view)
        except Exception as e:
            traceback.print_exc()
            return await ctx.respond(f"ERR: {str(e)}")


def setup(bot) -> None:
    """Run on Cog Load"""
    load_pagination_data()  # Load existing pagination data from file
    bot.add_cog(Sing(bot))