const { db } = require('../database/db');

// Default date format settings
const DEFAULT_FORMAT = {
  format: 'DD/MM/YYYY',
  locale: 'en-GB'
};

// Format date based on system settings
async function formatDate(date, language = 'en') {
  try {
    // Get date format setting from database
    const setting = await db('app_settings').where('setting_key', 'general_date_format').first();
    let dateConfig = DEFAULT_FORMAT;
    
    if (setting && setting.setting_value) {
      // Handle both string and object values
      if (typeof setting.setting_value === 'string') {
        try {
          dateConfig = JSON.parse(setting.setting_value);
        } catch (e) {
          console.warn('Failed to parse date format setting:', e.message);
          dateConfig = DEFAULT_FORMAT;
        }
      } else {
        dateConfig = setting.setting_value;
      }
    }
    
    const dateObj = date instanceof Date ? date : new Date(date);
    
    // Use appropriate locale based on language
    let locale = dateConfig.locale || 'en-GB';
    if (language === 'de') {
      locale = 'de-DE';
    } else if (language === 'en' && dateConfig.format === 'MM/DD/YYYY') {
      locale = 'en-US';
    }
    
    // Format based on the configured format
    switch (dateConfig.format) {
      case 'MM/DD/YYYY':
        return dateObj.toLocaleDateString(locale, {
          month: '2-digit',
          day: '2-digit',
          year: 'numeric'
        });
      case 'DD/MM/YYYY':
        return dateObj.toLocaleDateString(locale, {
          day: '2-digit',
          month: '2-digit',
          year: 'numeric'
        });
      case 'YYYY-MM-DD':
        return dateObj.toISOString().split('T')[0];
      case 'DD.MM.YYYY':
        return dateObj.toLocaleDateString('de-DE', {
          day: '2-digit',
          month: '2-digit',
          year: 'numeric'
        });
      default:
        // Use long format as fallback
        return dateObj.toLocaleDateString(locale, {
          year: 'numeric',
          month: 'long',
          day: 'numeric'
        });
    }
  } catch (error) {
    console.error('Error formatting date:', error);
    // Fallback to basic formatting
    return date instanceof Date ? date.toLocaleDateString() : new Date(date).toLocaleDateString();
  }
}

module.exports = {
  formatDate
};