import discord
from discord.ext import commands
from discord import ui
import logging
import sys
import os
from datetime import datetime, timedelta, timezone
from typing import Literal, Optional

# Add the parent directory to sys.path to ensure settings_manager is accessible
sys.path.append(os.path.dirname(os.path.dirname(os.path.abspath(__file__))))
import settings_manager

log = logging.getLogger(__name__)


# --- Message Component Views ---


class WelcomeMessageView(ui.LayoutView):
    """A simple view for welcome messages."""

    def __init__(self, member: discord.Member, message: str):
        super().__init__(timeout=None)

        container = ui.Container(accent_colour=member.color or discord.Color.blurple())

        header_section = ui.Section(
            accessory=ui.Thumbnail(
                media=member.display_avatar.url,
                description="User Avatar",
            )
        )
        header_section.add_item(ui.TextDisplay(message))

        container.add_item(header_section)
        self.add_item(container)


class GoodbyeMessageView(ui.LayoutView):
    """A simple view for goodbye messages."""

    def __init__(self, member: discord.Member, message: str):
        super().__init__(timeout=None)

        container = ui.Container(accent_colour=discord.Color.dark_grey())

        header_section = ui.Section(
            accessory=ui.Thumbnail(
                media=member.display_avatar.url,
                description="User Avatar",
            )
        )
        header_section.add_item(ui.TextDisplay(message))

        container.add_item(header_section)
        self.add_item(container)


class WelcomeCog(commands.Cog):
    """Handles welcome and goodbye messages for guilds."""

    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self.bot.add_listener(self.on_member_join, "on_member_join")
        self.bot.add_listener(self.on_member_remove, "on_member_remove")

    async def on_member_join(self, member: discord.Member):
        """Sends a welcome message when a new member joins."""
        guild = member.guild
        if not guild:
            return

        log.debug(f"Member {member.name} joined guild {guild.name} ({guild.id})")

        # --- Fetch settings ---
        welcome_channel_id_str = await settings_manager.get_setting(
            guild.id, "welcome_channel_id"
        )
        welcome_message_template = await settings_manager.get_setting(
            guild.id, "welcome_message", default="Welcome {user} to {server}!"
        )

        if not welcome_channel_id_str or welcome_channel_id_str == "__NONE__":
            log.debug(f"Welcome channel not configured for guild {guild.id}")
            return

        try:
            welcome_channel_id = int(welcome_channel_id_str)
            channel = guild.get_channel(welcome_channel_id)
            if not channel or not isinstance(channel, discord.TextChannel):
                log.warning(
                    f"Welcome channel ID {welcome_channel_id} not found or not text channel in guild {guild.id}"
                )
                return

            # --- Format and send message ---
            formatted_message = welcome_message_template.format(
                user=member.mention, username=member.name, server=guild.name
            )

            view = WelcomeMessageView(member, formatted_message)
            await channel.send(view=view)
            log.info(f"Sent welcome message for {member.name} in guild {guild.id}")

        except ValueError:
            log.error(
                f"Invalid welcome_channel_id '{welcome_channel_id_str}' configured for guild {guild.id}"
            )
        except discord.Forbidden:
            log.error(
                f"Missing permissions to send welcome message in channel {welcome_channel_id} for guild {guild.id}"
            )
        except Exception as e:
            log.exception(f"Error sending welcome message for guild {guild.id}: {e}")

    async def on_member_remove(self, member: discord.Member):
        """Sends a goodbye message when a member leaves, is kicked, or is banned."""
        guild = member.guild
        if not guild:
            return

        log.debug(f"Member {member.name} left guild {guild.name} ({guild.id})")

        # --- Fetch settings ---
        goodbye_channel_id_str = await settings_manager.get_setting(
            guild.id, "goodbye_channel_id"
        )
        goodbye_message_template = await settings_manager.get_setting(
            guild.id, "goodbye_message", default="{username} has left the server."
        )

        if not goodbye_channel_id_str or goodbye_channel_id_str == "__NONE__":
            log.debug(f"Goodbye channel not configured for guild {guild.id}")
            return

        try:
            goodbye_channel_id = int(goodbye_channel_id_str)
            channel = guild.get_channel(goodbye_channel_id)
            if not channel or not isinstance(channel, discord.TextChannel):
                log.warning(
                    f"Goodbye channel ID {goodbye_channel_id} not found or not text channel in guild {guild.id}"
                )
                return

            # --- Determine reason for leaving ---
            reason = "left"
            entry_user = None

            # Check audit log for kick or ban. We check last 2 minutes just in case of delays.
            try:
                # Check for ban first
                async for entry in guild.audit_logs(
                    limit=1,
                    action=discord.AuditLogAction.ban,
                    after=datetime.now(timezone.utc) - timedelta(minutes=2),
                ):
                    if entry.target and entry.target.id == member.id:
                        reason = "banned"
                        entry_user = entry.user
                        break

                # If not banned, check for kick
                if reason == "left":
                    async for entry in guild.audit_logs(
                        limit=1,
                        action=discord.AuditLogAction.kick,
                        after=datetime.now(timezone.utc) - timedelta(minutes=2),
                    ):
                        if entry.target and entry.target.id == member.id:
                            reason = "kicked"
                            entry_user = entry.user
                            break
            except discord.Forbidden:
                log.warning(
                    f"Missing 'View Audit Log' permissions in guild {guild.id} to determine member remove reason."
                )
            except Exception as e:
                log.error(
                    f"Error checking audit log for {member.name} in {guild.id}: {e}"
                )

            # --- Format and send message ---
            if reason == "left":
                formatted_message = goodbye_message_template.format(
                    user=member.mention,  # Might not be mentionable after leaving
                    username=member.name,
                    server=guild.name,
                )
            elif reason == "kicked":
                formatted_message = f"{member.name} was kicked from the server"
                if entry_user and entry_user != self.bot.user:
                    formatted_message += f" by {entry_user.name}"
                formatted_message += "."
            else:  # banned
                formatted_message = f"{member.name} was banned from the server"
                if entry_user and entry_user != self.bot.user:
                    formatted_message += f" by {entry_user.name}"
                formatted_message += "."

            view = GoodbyeMessageView(member, formatted_message)
            await channel.send(view=view)
            log.info(
                f"Sent goodbye message for {member.name} in guild {guild.id} (Reason: {reason})"
            )

        except ValueError:
            log.error(
                f"Invalid goodbye_channel_id '{goodbye_channel_id_str}' configured for guild {guild.id}"
            )
        except discord.Forbidden:
            log.error(
                f"Missing permissions to send goodbye message in channel {goodbye_channel_id} for guild {guild.id}"
            )
        except Exception as e:
            log.exception(f"Error sending goodbye message for guild {guild.id}: {e}")

    @commands.command(
        name="setwelcome",
        help="Sets the welcome message and channel. Usage: `setwelcome #channel [message template]`",
    )
    @commands.has_permissions(administrator=True)
    @commands.guild_only()
    async def set_welcome(
        self,
        ctx: commands.Context,
        channel: discord.TextChannel,
        *,
        message_template: str = "Welcome {user} to {server}!",
    ):
        """Sets the channel and template for welcome messages."""
        guild_id = ctx.guild.id
        key_channel = "welcome_channel_id"
        key_message = "welcome_message"

        # Use settings_manager.set_setting
        success_channel = await settings_manager.set_setting(
            guild_id, key_channel, str(channel.id)
        )
        success_message = await settings_manager.set_setting(
            guild_id, key_message, message_template
        )

        if success_channel and success_message:  # Both need to succeed
            await ctx.send(
                f"Welcome messages will now be sent to {channel.mention} with the template:\n```\n{message_template}\n```"
            )
            log.info(
                f"Welcome settings updated for guild {guild_id} by {ctx.author.name}"
            )
        else:
            await ctx.send("Failed to save welcome settings. Check logs.")
            log.error(f"Failed to save welcome settings for guild {guild_id}")

    @commands.command(
        name="disablewelcome", help="Disables welcome messages for this server."
    )
    @commands.has_permissions(administrator=True)
    @commands.guild_only()
    async def disable_welcome(self, ctx: commands.Context):
        """Disables welcome messages by removing the channel setting."""
        guild_id = ctx.guild.id
        key_channel = "welcome_channel_id"
        key_message = "welcome_message"  # Also clear the message template

        # Use set_setting with None to delete the settings
        success_channel = await settings_manager.set_setting(guild_id, key_channel, None)
        success_message = await settings_manager.set_setting(guild_id, key_message, None)

        if success_channel and success_message:  # Both need to succeed
            await ctx.send("Welcome messages have been disabled.")
            log.info(
                f"Welcome messages disabled for guild {guild_id} by {ctx.author.name}"
            )
        else:
            await ctx.send("Failed to disable welcome messages. Check logs.")
            log.error(f"Failed to disable welcome settings for guild {guild_id}")

    @commands.command(
        name="setgoodbye",
        help="Sets the goodbye message and channel. Usage: `setgoodbye #channel [message template]`",
    )
    @commands.has_permissions(administrator=True)
    @commands.guild_only()
    async def set_goodbye(
        self,
        ctx: commands.Context,
        channel: discord.TextChannel,
        *,
        message_template: str = "{username} has left the server.",
    ):
        """Sets the channel and template for goodbye messages."""
        guild_id = ctx.guild.id
        key_channel = "goodbye_channel_id"
        key_message = "goodbye_message"

        # Use settings_manager.set_setting
        success_channel = await settings_manager.set_setting(
            guild_id, key_channel, str(channel.id)
        )
        success_message = await settings_manager.set_setting(
            guild_id, key_message, message_template
        )

        if success_channel and success_message:  # Both need to succeed
            await ctx.send(
                f"Goodbye messages will now be sent to {channel.mention} with the template:\n```\n{message_template}\n```"
            )
            log.info(
                f"Goodbye settings updated for guild {guild_id} by {ctx.author.name}"
            )
        else:
            await ctx.send("Failed to save goodbye settings. Check logs.")
            log.error(f"Failed to save goodbye settings for guild {guild_id}")

    @commands.command(
        name="disablegoodbye", help="Disables goodbye messages for this server."
    )
    @commands.has_permissions(administrator=True)
    @commands.guild_only()
    async def disable_goodbye(self, ctx: commands.Context):
        """Disables goodbye messages by removing the channel setting."""
        guild_id = ctx.guild.id
        key_channel = "goodbye_channel_id"
        key_message = "goodbye_message"

        # Use set_setting with None to delete the settings
        success_channel = await settings_manager.set_setting(guild_id, key_channel, None)
        success_message = await settings_manager.set_setting(guild_id, key_message, None)

        if success_channel and success_message:  # Both need to succeed
            await ctx.send("Goodbye messages have been disabled.")
            log.info(
                f"Goodbye messages disabled for guild {guild_id} by {ctx.author.name}"
            )
        else:
            await ctx.send("Failed to disable goodbye messages. Check logs.")
            log.error(f"Failed to disable goodbye settings for guild {guild_id}")

    # Error Handling for this Cog
    @disable_goodbye.error
    # --- Test Commands ---
    @commands.group(
        name="testmessage",
        help="Test the welcome or goodbye messages.",
        invoke_without_command=True,
    )
    @commands.has_permissions(administrator=True)
    @commands.guild_only()
    async def testmessage(self, ctx: commands.Context):
        """Shows help for the testmessage command group."""
        await ctx.send_help(ctx.command)

    @testmessage.command(name="welcome")
    async def test_welcome(
        self, ctx: commands.Context, member: Optional[discord.Member] = None
    ):
        """Simulates a member joining to test the welcome message."""
        target_member = member or ctx.author
        await self.on_member_join(target_member)
        await ctx.send(
            f"Simulated welcome message for {target_member.mention}. Check the configured welcome channel.",
            ephemeral=True,
        )

    @testmessage.command(name="goodbye")
    async def test_goodbye(
        self,
        ctx: commands.Context,
        reason: Literal["left", "kicked", "banned"] = "left",
        member: Optional[discord.Member] = None,
    ):
        """Simulates a member leaving to test the goodbye message."""
        target_member = member or ctx.author
        guild = ctx.guild

        # --- Fetch settings ---
        goodbye_channel_id_str = await settings_manager.get_setting(
            guild.id, "goodbye_channel_id"
        )
        goodbye_message_template = await settings_manager.get_setting(
            guild.id, "goodbye_message", default="{username} has left the server."
        )

        if not goodbye_channel_id_str or goodbye_channel_id_str == "__NONE__":
            await ctx.send("Goodbye message channel is not configured.", ephemeral=True)
            return

        try:
            goodbye_channel_id = int(goodbye_channel_id_str)
            channel = guild.get_channel(goodbye_channel_id)
            if not channel or not isinstance(channel, discord.TextChannel):
                await ctx.send(
                    "Configured goodbye channel not found or is not a text channel.",
                    ephemeral=True,
                )
                return

            # --- Format and send message based on simulated reason ---
            if reason == "left":
                formatted_message = goodbye_message_template.format(
                    user=target_member.mention,
                    username=target_member.name,
                    server=guild.name,
                )
            elif reason == "kicked":
                formatted_message = (
                    f"{target_member.name} was kicked from the server by {ctx.author.name}."
                )
            else:  # banned
                formatted_message = (
                    f"{target_member.name} was banned from the server by {ctx.author.name}."
                )

            view = GoodbyeMessageView(target_member, formatted_message)
            await channel.send(view=view)
            await ctx.send(
                f"Simulated goodbye message for {target_member.mention} (Reason: {reason}). Check the configured goodbye channel.",
                ephemeral=True,
            )

        except ValueError:
            await ctx.send("Invalid goodbye channel ID configured.", ephemeral=True)
        except discord.Forbidden:
            await ctx.send(
                "I don't have permissions to send messages in the configured goodbye channel.",
                ephemeral=True,
            )
        except Exception as e:
            log.exception(
                f"Error sending test goodbye message for guild {guild.id}: {e}"
            )
            await ctx.send("An unexpected error occurred.", ephemeral=True)

    # Error Handling for this Cog
    async def cog_command_error(self, ctx: commands.Context, error: commands.CommandError):
        """Handles errors for all commands in this cog."""
        if isinstance(error, commands.MissingPermissions):
            await ctx.send("You need Administrator permissions to use this command.", ephemeral=True)
        elif isinstance(error, commands.BadArgument):
            await ctx.send(
                f"Invalid argument provided. Check the command help: `{ctx.prefix}help {ctx.command.name}`",
                ephemeral=True
            )
        elif isinstance(error, commands.MissingRequiredArgument):
            await ctx.send(
                f"Missing required argument. Check the command help: `{ctx.prefix}help {ctx.command.name}`",
                ephemeral=True
            )
        elif isinstance(error, commands.NoPrivateMessage):
            await ctx.send("This command cannot be used in private messages.", ephemeral=True)
        else:
            original_error = getattr(error, 'original', error)
            log.error(
                f"Unhandled error in WelcomeCog command '{ctx.command.name}': {original_error}"
            )
            await ctx.send("An unexpected error occurred. Please check the logs.", ephemeral=True)


async def setup(bot: commands.Bot):
    # Ensure bot has pools initialized before adding the cog
    if (
        not hasattr(bot, "pg_pool")
        or not hasattr(bot, "redis")
        or bot.pg_pool is None
        or bot.redis is None
    ):
        log.warning(
            "Bot pools not initialized before loading WelcomeCog. Cog will not load."
        )
        return  # Prevent loading if pools are missing

    welcome_cog = WelcomeCog(bot)
    await bot.add_cog(welcome_cog)
    log.info("WelcomeCog loaded.")