const { SlashCommandBuilder, EmbedBuilder, PermissionFlagsBits } = require('discord.js');

const PRESET_EVENTS = {
  halloween: {
    name: 'Halloween Spooktacular',
    description: 'Spooky season is here! Earn bonus XP and unlock exclusive Halloween rewards.',
    emoji: '🎃',
    color: 0xff6600,
    xp_multiplier: 1.5,
    month: 10,
    start_day: 15,
    end_day: 31
  },
  christmas: {
    name: 'Winter Wonderland',
    description: 'Celebrate the holidays with festive rewards and XP bonuses!',
    emoji: '🎄',
    color: 0x00a651,
    xp_multiplier: 2.0,
    month: 12,
    start_day: 15,
    end_day: 31
  },
  newyear: {
    name: 'New Year Celebration',
    description: 'Ring in the new year with special bonuses!',
    emoji: '🎆',
    color: 0xffd700,
    xp_multiplier: 2.0,
    month: 1,
    start_day: 1,
    end_day: 7
  },
  valentine: {
    name: 'Valentine\'s Day',
    description: 'Spread the love with bonus XP for reactions and kind messages!',
    emoji: '💕',
    color: 0xff69b4,
    xp_multiplier: 1.5,
    month: 2,
    start_day: 10,
    end_day: 14
  },
  easter: {
    name: 'Easter Egg Hunt',
    description: 'Hunt for hidden eggs and earn bonus rewards!',
    emoji: '🐰',
    color: 0x87ceeb,
    xp_multiplier: 1.5,
    month: 4,
    start_day: 1,
    end_day: 15
  },
  summer: {
    name: 'Summer Bash',
    description: 'Beat the heat with cool rewards and XP boosts!',
    emoji: '☀️',
    color: 0xffa500,
    xp_multiplier: 1.25,
    month: 7,
    start_day: 1,
    end_day: 31
  },
  anniversary: {
    name: 'Server Anniversary',
    description: 'Celebrate your server\'s special day!',
    emoji: '🎂',
    color: 0x9b59b6,
    xp_multiplier: 2.0,
    month: null,
    start_day: null,
    end_day: null
  }
};

module.exports = {
  data: new SlashCommandBuilder()
    .setName('seasonal')
    .setDescription('Manage seasonal events and XP bonuses')
    .setDefaultMemberPermissions(PermissionFlagsBits.ManageGuild)
    .addSubcommand(sub => sub.setName('active').setDescription('View currently active seasonal events'))
    .addSubcommand(sub => sub.setName('list').setDescription('List all configured seasonal events'))
    .addSubcommand(sub => sub.setName('create').setDescription('Create a custom seasonal event')
      .addStringOption(opt => opt.setName('name').setDescription('Event name').setRequired(true).setMaxLength(50))
      .addStringOption(opt => opt.setName('description').setDescription('Event description').setRequired(true).setMaxLength(200))
      .addStringOption(opt => opt.setName('start').setDescription('Start date (YYYY-MM-DD)').setRequired(true))
      .addStringOption(opt => opt.setName('end').setDescription('End date (YYYY-MM-DD)').setRequired(true))
      .addNumberOption(opt => opt.setName('multiplier').setDescription('XP multiplier (e.g., 1.5)').setMinValue(1).setMaxValue(5))
      .addIntegerOption(opt => opt.setName('bonus_xp').setDescription('Bonus XP per message during event'))
      .addStringOption(opt => opt.setName('emoji').setDescription('Event emoji').setMaxLength(10)))
    .addSubcommand(sub => sub.setName('preset').setDescription('Enable a preset seasonal event')
      .addStringOption(opt => opt.setName('event').setDescription('Preset event to enable')
        .addChoices(
          { name: '🎃 Halloween', value: 'halloween' },
          { name: '🎄 Christmas', value: 'christmas' },
          { name: '🎆 New Year', value: 'newyear' },
          { name: '💕 Valentine\'s Day', value: 'valentine' },
          { name: '🐰 Easter', value: 'easter' },
          { name: '☀️ Summer Bash', value: 'summer' },
          { name: '🎂 Anniversary', value: 'anniversary' }
        ).setRequired(true))
      .addIntegerOption(opt => opt.setName('year').setDescription('Year for the event (defaults to current/next)'))
      .addStringOption(opt => opt.setName('start').setDescription('Custom start date for anniversary (YYYY-MM-DD)')))
    .addSubcommand(sub => sub.setName('delete').setDescription('Delete a seasonal event')
      .addStringOption(opt => opt.setName('name').setDescription('Event name to delete').setRequired(true).setAutocomplete(true)))
    .addSubcommand(sub => sub.setName('announce').setDescription('Announce an active event to a channel')
      .addChannelOption(opt => opt.setName('channel').setDescription('Channel to announce in').setRequired(true))),

  async execute(interaction, supabase) {
    if (!supabase) {
      return interaction.reply({ content: 'Database not available.', ephemeral: true });
    }

    const subcommand = interaction.options.getSubcommand();

    if (subcommand === 'active') {
      const now = new Date();
      const { data: events } = await supabase
        .from('seasonal_events')
        .select('*')
        .eq('guild_id', interaction.guildId)
        .lte('start_date', now.toISOString())
        .gte('end_date', now.toISOString())
        .order('start_date', { ascending: true });

      if (!events || events.length === 0) {
        const embed = new EmbedBuilder()
          .setColor(0x7c3aed)
          .setTitle('🎉 Active Seasonal Events')
          .setDescription('No seasonal events are currently active.\nUse `/seasonal create` or `/seasonal preset` to set one up!')
          .setTimestamp();
        return interaction.reply({ embeds: [embed] });
      }

      const embed = new EmbedBuilder()
        .setColor(0x22c55e)
        .setTitle('🎉 Active Seasonal Events')
        .setTimestamp();

      for (const event of events) {
        const endDate = new Date(event.end_date);
        const daysLeft = Math.ceil((endDate - now) / (1000 * 60 * 60 * 24));
        
        embed.addFields({
          name: `${event.emoji || '🎊'} ${event.name}`,
          value: `${event.description}\n**XP Multiplier:** ${event.xp_multiplier}x\n**Bonus XP:** ${event.bonus_xp || 0}/message\n**Ends:** <t:${Math.floor(endDate.getTime() / 1000)}:R> (${daysLeft} days left)`,
          inline: false
        });
      }

      await interaction.reply({ embeds: [embed] });
    }

    if (subcommand === 'list') {
      const { data: events } = await supabase
        .from('seasonal_events')
        .select('*')
        .eq('guild_id', interaction.guildId)
        .order('start_date', { ascending: true });

      if (!events || events.length === 0) {
        const embed = new EmbedBuilder()
          .setColor(0x7c3aed)
          .setTitle('📅 Seasonal Events')
          .setDescription('No seasonal events configured.\nUse `/seasonal create` or `/seasonal preset` to add one!')
          .setTimestamp();
        return interaction.reply({ embeds: [embed] });
      }

      const now = new Date();
      const embed = new EmbedBuilder()
        .setColor(0x7c3aed)
        .setTitle('📅 Seasonal Events')
        .setFooter({ text: `${events.length} event(s) configured` })
        .setTimestamp();

      for (const event of events) {
        const startDate = new Date(event.start_date);
        const endDate = new Date(event.end_date);
        const isActive = now >= startDate && now <= endDate;
        const isPast = now > endDate;
        const status = isActive ? '🟢 Active' : isPast ? '⚫ Ended' : '🟡 Upcoming';

        embed.addFields({
          name: `${event.emoji || '🎊'} ${event.name} ${status}`,
          value: `${event.description}\n**Period:** <t:${Math.floor(startDate.getTime() / 1000)}:D> - <t:${Math.floor(endDate.getTime() / 1000)}:D>\n**XP:** ${event.xp_multiplier}x | **Bonus XP:** +${event.bonus_xp || 0}`,
          inline: false
        });
      }

      await interaction.reply({ embeds: [embed] });
    }

    if (subcommand === 'create') {
      const name = interaction.options.getString('name');
      const description = interaction.options.getString('description');
      const startStr = interaction.options.getString('start');
      const endStr = interaction.options.getString('end');
      const multiplier = interaction.options.getNumber('multiplier') || 1.5;
      const bonusXp = interaction.options.getInteger('bonus_xp') || 0;
      const emoji = interaction.options.getString('emoji') || '🎊';

      const startDate = new Date(startStr);
      startDate.setHours(0, 0, 0, 0);
      const endDate = new Date(endStr);
      endDate.setHours(23, 59, 59, 999);

      if (isNaN(startDate.getTime()) || isNaN(endDate.getTime())) {
        return interaction.reply({ content: 'Invalid date format. Use YYYY-MM-DD.', ephemeral: true });
      }

      if (endDate <= startDate) {
        return interaction.reply({ content: 'End date must be after start date.', ephemeral: true });
      }

      const { count } = await supabase
        .from('seasonal_events')
        .select('*', { count: 'exact', head: true })
        .eq('guild_id', interaction.guildId);

      if (count >= 20) {
        return interaction.reply({ content: 'Maximum of 20 seasonal events per server.', ephemeral: true });
      }

      const { error } = await supabase.from('seasonal_events').insert({
        guild_id: interaction.guildId,
        name,
        description,
        emoji,
        start_date: startDate.toISOString(),
        end_date: endDate.toISOString(),
        xp_multiplier: multiplier,
        bonus_xp: bonusXp,
        created_by: interaction.user.id
      });

      if (error) {
        console.error('Seasonal event create error:', error);
        return interaction.reply({ content: 'Failed to create event.', ephemeral: true });
      }

      const embed = new EmbedBuilder()
        .setColor(0x22c55e)
        .setTitle(`${emoji} Seasonal Event Created!`)
        .setDescription(`**${name}**\n${description}`)
        .addFields(
          { name: 'Start', value: `<t:${Math.floor(startDate.getTime() / 1000)}:F>`, inline: true },
          { name: 'End', value: `<t:${Math.floor(endDate.getTime() / 1000)}:F>`, inline: true },
          { name: 'XP Multiplier', value: `${multiplier}x`, inline: true },
          { name: 'Bonus XP', value: `+${bonusXp}/message`, inline: true }
        )
        .setTimestamp();

      await interaction.reply({ embeds: [embed] });
    }

    if (subcommand === 'preset') {
      const presetKey = interaction.options.getString('event');
      const preset = PRESET_EVENTS[presetKey];
      const year = interaction.options.getInteger('year') || new Date().getFullYear();
      const customStart = interaction.options.getString('start');

      let startDate, endDate;

      if (presetKey === 'anniversary' && customStart) {
        startDate = new Date(customStart);
        endDate = new Date(startDate);
        endDate.setDate(endDate.getDate() + 7);
      } else if (preset.month) {
        startDate = new Date(year, preset.month - 1, preset.start_day);
        endDate = new Date(year, preset.month - 1, preset.end_day, 23, 59, 59);
        
        if (startDate < new Date() && presetKey !== 'newyear') {
          startDate.setFullYear(startDate.getFullYear() + 1);
          endDate.setFullYear(endDate.getFullYear() + 1);
        }
      } else {
        return interaction.reply({ content: 'Anniversary events require a custom start date.', ephemeral: true });
      }

      const { error } = await supabase.from('seasonal_events').insert({
        guild_id: interaction.guildId,
        name: preset.name,
        description: preset.description,
        emoji: preset.emoji,
        start_date: startDate.toISOString(),
        end_date: endDate.toISOString(),
        xp_multiplier: preset.xp_multiplier,
        bonus_xp: 0,
        preset_type: presetKey,
        created_by: interaction.user.id
      });

      if (error) {
        if (error.code === '23505') {
          return interaction.reply({ content: 'This preset event already exists for that time period.', ephemeral: true });
        }
        console.error('Preset event error:', error);
        return interaction.reply({ content: 'Failed to create preset event.', ephemeral: true });
      }

      const embed = new EmbedBuilder()
        .setColor(preset.color)
        .setTitle(`${preset.emoji} ${preset.name} Enabled!`)
        .setDescription(preset.description)
        .addFields(
          { name: 'Start', value: `<t:${Math.floor(startDate.getTime() / 1000)}:F>`, inline: true },
          { name: 'End', value: `<t:${Math.floor(endDate.getTime() / 1000)}:F>`, inline: true },
          { name: 'XP Multiplier', value: `${preset.xp_multiplier}x`, inline: true }
        )
        .setTimestamp();

      await interaction.reply({ embeds: [embed] });
    }

    if (subcommand === 'delete') {
      const eventName = interaction.options.getString('name');

      const { data: event } = await supabase
        .from('seasonal_events')
        .select('id, name, emoji')
        .eq('guild_id', interaction.guildId)
        .ilike('name', `%${eventName}%`)
        .maybeSingle();

      if (!event) {
        return interaction.reply({ content: `No event found matching "${eventName}".`, ephemeral: true });
      }

      const { error } = await supabase
        .from('seasonal_events')
        .delete()
        .eq('id', event.id);

      if (error) {
        return interaction.reply({ content: 'Failed to delete event.', ephemeral: true });
      }

      const embed = new EmbedBuilder()
        .setColor(0xef4444)
        .setTitle('Event Deleted')
        .setDescription(`${event.emoji || '🎊'} **${event.name}** has been removed.`)
        .setTimestamp();

      await interaction.reply({ embeds: [embed] });
    }

    if (subcommand === 'announce') {
      const channel = interaction.options.getChannel('channel');
      const now = new Date();

      const { data: events } = await supabase
        .from('seasonal_events')
        .select('*')
        .eq('guild_id', interaction.guildId)
        .lte('start_date', now.toISOString())
        .gte('end_date', now.toISOString());

      if (!events || events.length === 0) {
        return interaction.reply({ content: 'No active events to announce.', ephemeral: true });
      }

      const embed = new EmbedBuilder()
        .setColor(0x7c3aed)
        .setTitle('🎉 Seasonal Event Active!')
        .setDescription('Special bonuses are now available!')
        .setTimestamp();

      for (const event of events) {
        const endDate = new Date(event.end_date);
        embed.addFields({
          name: `${event.emoji || '🎊'} ${event.name}`,
          value: `${event.description}\n\n**Bonuses:**\n• ${event.xp_multiplier}x XP multiplier\n${event.bonus_xp > 0 ? `• +${event.bonus_xp} XP per message\n` : ''}• Ends: <t:${Math.floor(endDate.getTime() / 1000)}:R>`,
          inline: false
        });
      }

      embed.setFooter({ text: `${events.length} event(s) active` });

      try {
        await channel.send({ embeds: [embed] });
        await interaction.reply({ content: `Event announcement sent to ${channel}!`, ephemeral: true });
      } catch (err) {
        await interaction.reply({ content: 'Failed to send announcement. Check bot permissions.', ephemeral: true });
      }
    }
  },

  async autocomplete(interaction, supabase) {
    if (!supabase) return;
    
    const focusedValue = interaction.options.getFocused();
    
    const { data: events } = await supabase
      .from('seasonal_events')
      .select('name')
      .eq('guild_id', interaction.guildId)
      .ilike('name', `%${focusedValue}%`)
      .limit(25);

    const choices = (events || []).map(e => ({ name: e.name, value: e.name }));
    await interaction.respond(choices);
  }
};