const { readdirSync } = require("fs")
const { join } = require("path")
const logger = require("../functions/logger")

/**
 * Loads and registers all function modules from the functions directory
 * @param {Object} client - The client instance
 * @returns {Promise<void>}
 */
module.exports = async (client) => {
  try {
    if (!client || !client.functions) {
      throw new Error('Invalid client object or missing functions collection');
    }

    const functionsDir = join(__dirname, '..', 'functions');
    const functions = readdirSync(functionsDir)
      .filter(file => file.endsWith('.js') && file !== 'logger.js');

    const loadedFunctions = await Promise.all(
      functions.map(async (file) => {
        try {
          const functionName = file.split('.')[0];
          const functionModule = require(join(functionsDir, file));
          client.functions.set(functionName, functionModule);
          return functionName;
        } catch (error) {
          logger.error('Function_Handler', `Failed to load function ${file}: ${error.message}`);
          return null;
        }
      })
    );

    const successfulLoads = loadedFunctions.filter(Boolean).length;
    logger.event('Function_Handler', `Successfully loaded ${successfulLoads}/${functions.length} functions`);
  } catch (error) {
    logger.error('Function_Handler', `Failed to initialize function handler: ${error.message}`);
    throw error;
  }
};