import { SlashCommandBuilder, PermissionFlagsBits, EmbedBuilder } from 'discord.js';

/**
 * botUtils module - provides administrative bot control commands
 * Currently implements an owner-only exit command for graceful shutdown.
 */
// Define slash commands
export const commands = [
  {
    data: new SlashCommandBuilder()
      .setName('exit')
      .setDescription('Gracefully shutdown the bot (Owner only)')
      // Restrict to server administrators by default
      .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
      .setDMPermission(false)
      .addIntegerOption(option =>
        option
          .setName('code')
          .setDescription('Exit code to use (default 0)')
          .setRequired(false)
      ),
    /**
     * Execute the exit command: only the configured owner can invoke.
     * @param {import('discord.js').CommandInteraction} interaction
     * @param {import('discord.js').Client} client
     */
    async execute(interaction, client) {
      const ownerId = client.config.owner;
      // Check invoking user is the bot owner
      if (interaction.user.id !== String(ownerId)) {
        return interaction.reply({ content: 'Only the bot owner can shutdown the bot.', ephemeral: true });
      }
      // Determine desired exit code (default 0)
      const exitCode = interaction.options.getInteger('code') ?? 0;
      // Validate exit code bounds
      if (exitCode < 0 || exitCode > 254) {
        return interaction.reply({ content: 'Exit code must be between 0 and 254 inclusive.', ephemeral: true });
      }
      // Acknowledge before shutting down
      await interaction.reply({ content: `Shutting down with exit code ${exitCode}...`, ephemeral: true });
      client.logger.info(
        `[cmd:exit] Shutdown initiated by owner ${interaction.user.tag} (${interaction.user.id}), exit code ${exitCode}`
      );
      // Destroy Discord client and exit process
      try {
        await client.destroy();
      } catch (err) {
        client.logger.error(`[cmd:exit] Error during client.destroy(): ${err}`);
      }
      process.exit(exitCode);
    }
  },
  // /status: admin-only, shows current client info
  {
    data: new SlashCommandBuilder()
      .setName('status')
      .setDescription('Show this bot client status and process info')
      .setDefaultMemberPermissions(PermissionFlagsBits.Administrator)
      .setDMPermission(false)
      .addBooleanOption(option =>
        option
          .setName('ephemeral')
          .setDescription('Whether the response should be ephemeral')
          .setRequired(false)
      ),
    async execute(interaction, client) {
      // Determine if response should be ephemeral (default true)
      const ephemeral = interaction.options.getBoolean('ephemeral') ?? true;
      await interaction.deferReply({ ephemeral });
      // Process metrics
      const uptimeSec = process.uptime();
      const hours = Math.floor(uptimeSec / 3600);
      const minutes = Math.floor((uptimeSec % 3600) / 60);
      const seconds = Math.floor(uptimeSec % 60);
      const uptime = `${hours}h ${minutes}m ${seconds}s`;
      const mem = process.memoryUsage();
      const toMB = bytes => (bytes / 1024 / 1024).toFixed(2);
      const memoryInfo = `RSS: ${toMB(mem.rss)} MB, Heap: ${toMB(mem.heapUsed)}/${toMB(mem.heapTotal)} MB`;
      const cpu = process.cpuUsage();
      const cpuInfo = `User: ${(cpu.user / 1000).toFixed(2)} ms, System: ${(cpu.system / 1000).toFixed(2)} ms`;
      const nodeVersion = process.version;
      const platform = `${process.platform} ${process.arch}`;
      // Client-specific stats
      const guildCount = client.guilds.cache.size;
      const userCount = client.guilds.cache.reduce((sum, g) => sum + (g.memberCount || 0), 0);
      const commandCount = client.commands.size;
      // List of loaded optional modules
      const loadedModules = client.modules ? Array.from(client.modules.keys()) : [];
      // Build embed for status
      // Determine if gitUtils module is loaded
      const gitLoaded = client.modules?.has('gitUtils');
      let branch, build, statusBlock;
      if (gitLoaded) {
        const git = client.modules.get('gitUtils');
        try {
          branch = await git.getBranch();
          build = await git.getShortHash();
          const statusRaw = await git.getStatusShort();
          // Format status as fenced code block using template literals
          // Normalize each line with a leading space in a code fence
          // Prefix raw status output with a single space
          statusBlock = statusRaw
            ? '```\n ' + statusRaw + '\n```'
            : '```\n (clean)\n```';
        } catch {
          branch = 'error';
          build = 'error';
          // Represent error status in code fence
          statusBlock = '```\n (error)\n```';
        }
      }
      // Prepare module list as bullet points
      const moduleList = loadedModules.length > 0
        ? loadedModules.map(m => `• ${m}`).join('\n')
        : 'None';
      // Assemble fields
      const fields = [];
      // Client identification
      fields.push({ name: 'Client', value: client.config.id, inline: false });
      // Performance metrics
      fields.push({ name: 'CPU Usage', value: cpuInfo, inline: false });
      fields.push({ name: 'Memory', value: memoryInfo, inline: false });
      // Environment
      fields.push({ name: 'Node.js', value: nodeVersion, inline: true });
      fields.push({ name: 'Platform', value: platform, inline: true });
      // Uptime
      fields.push({ name: 'Uptime', value: uptime, inline: true });
      // Loaded modules
      fields.push({ name: 'Modules', value: moduleList, inline: false });
      // Entity counts
      fields.push({ name: 'Commands', value: commandCount.toString(), inline: true });
      fields.push({ name: 'Guilds', value: guildCount.toString(), inline: true });
      fields.push({ name: 'Users', value: userCount.toString(), inline: true });
      // Git reference and status if available
      if (gitLoaded) {
        fields.push({ name: 'Git Reference', value: `${branch}/${build}`, inline: false });
        fields.push({ name: 'Git Status', value: statusBlock, inline: false });
      }
      // Create embed
      const embed = new EmbedBuilder()
        .setAuthor({ name: 'ClientX', iconURL: client.user.displayAvatarURL() })
        .setThumbnail(client.user.displayAvatarURL())
        .addFields(fields)
        .setTimestamp();
      await interaction.editReply({ embeds: [embed] });
      client.logger.info(`[cmd:status] Returned status embed for client ${client.config.id}`);
    }
  }
];

// Module loaded logging
export async function init(client, clientConfig) {
  client.logger.info('[module:botUtils] Module loaded');
}