const fs = require('fs');
const path = require('path');

// Function to update config.json with form data
async function updateConfig(formData) {
  return new Promise((resolve, reject) => {
    const configPath = path.join(__dirname, 'config.json');
    
    // Read the existing config file
    fs.readFile(configPath, 'utf8', (err, data) => {
      if (err) {
        reject(new Error(`Failed to read config file: ${err.message}`));
        return;
      }
      
      try {
        // Parse the existing config
        const configData = JSON.parse(data);
        
        // Update user_data in the config with form data
        configData.user_data = {
          // Contact information
          first_name: formData.firstName || "",
          last_name: formData.lastName || "",
          company_name: formData.company || "",
          email: formData.email || "",
          phone: formData.phone || "",
          store_name: formData.storeName || "",
          country: formData.country || "",
          starting_date: formData.startingDate || "",
          duration: parseInt(formData.duration) || 36,
          
          // Store information
          store_types: getSelectedStoreTypes(formData),
          open_days_per_month: parseInt(formData.openDays) || 0,
          
          // Store type specific data
          convenience_store_type: {
            stores_number: isStoreTypeSelected(formData, 'Convenience') ? parseInt(formData.convenience_stores) || 0 : 0,
            monthly_transactions: isStoreTypeSelected(formData, 'Convenience') ? parseInt(formData.convenience_transactions) || 0 : 0,
            has_digital_screens: isStoreTypeSelected(formData, 'Convenience') ? formData.convenience_screens === "Yes" : false,
            screen_count: isStoreTypeSelected(formData, 'Convenience') ? parseInt(formData.convenience_screen_count) || 0 : 0,
            screen_percentage: isStoreTypeSelected(formData, 'Convenience') ? parseInt(formData.convenience_screen_percentage) || 0 : 0,
            has_in_store_radio: isStoreTypeSelected(formData, 'Convenience') ? formData.convenience_radio === "Yes" : false,
            radio_percentage: isStoreTypeSelected(formData, 'Convenience') ? parseInt(formData.convenience_radio_percentage) || 0 : 0,
            open_days_per_month: parseInt(formData.openDays) || 0
          },

          minimarket_store_type: {
            stores_number: isStoreTypeSelected(formData, 'Minimarket') ? parseInt(formData.minimarket_stores) || 0 : 0,
            monthly_transactions: isStoreTypeSelected(formData, 'Minimarket') ? parseInt(formData.minimarket_transactions) || 0 : 0,
            has_digital_screens: isStoreTypeSelected(formData, 'Minimarket') ? formData.minimarket_screens === "Yes" : false,
            screen_count: isStoreTypeSelected(formData, 'Minimarket') ? parseInt(formData.minimarket_screen_count) || 0 : 0,
            screen_percentage: isStoreTypeSelected(formData, 'Minimarket') ? parseInt(formData.minimarket_screen_percentage) || 0 : 0,
            has_in_store_radio: isStoreTypeSelected(formData, 'Minimarket') ? formData.minimarket_radio === "Yes" : false,
            radio_percentage: isStoreTypeSelected(formData, 'Minimarket') ? parseInt(formData.minimarket_radio_percentage) || 0 : 0,
            open_days_per_month: parseInt(formData.openDays) || 0
          },

          supermarket_store_type: {
            stores_number: isStoreTypeSelected(formData, 'Supermarket') ? parseInt(formData.supermarket_stores) || 0 : 0,
            monthly_transactions: isStoreTypeSelected(formData, 'Supermarket') ? parseInt(formData.supermarket_transactions) || 0 : 0,
            has_digital_screens: isStoreTypeSelected(formData, 'Supermarket') ? formData.supermarket_screens === "Yes" : false,
            screen_count: isStoreTypeSelected(formData, 'Supermarket') ? parseInt(formData.supermarket_screen_count) || 0 : 0,
            screen_percentage: isStoreTypeSelected(formData, 'Supermarket') ? parseInt(formData.supermarket_screen_percentage) || 0 : 0,
            has_in_store_radio: isStoreTypeSelected(formData, 'Supermarket') ? formData.supermarket_radio === "Yes" : false,
            radio_percentage: isStoreTypeSelected(formData, 'Supermarket') ? parseInt(formData.supermarket_radio_percentage) || 0 : 0,
            open_days_per_month: parseInt(formData.openDays) || 0
          },
          
          hypermarket_store_type: {
            stores_number: isStoreTypeSelected(formData, 'Hypermarket') ? parseInt(formData.hypermarket_stores) || 0 : 0,
            monthly_transactions: isStoreTypeSelected(formData, 'Hypermarket') ? parseInt(formData.hypermarket_transactions) || 0 : 0,
            has_digital_screens: isStoreTypeSelected(formData, 'Hypermarket') ? formData.hypermarket_screens === "Yes" : false,
            screen_count: isStoreTypeSelected(formData, 'Hypermarket') ? parseInt(formData.hypermarket_screen_count) || 0 : 0,
            screen_percentage: isStoreTypeSelected(formData, 'Hypermarket') ? parseInt(formData.hypermarket_screen_percentage) || 0 : 0,
            has_in_store_radio: isStoreTypeSelected(formData, 'Hypermarket') ? formData.hypermarket_radio === "Yes" : false,
            radio_percentage: isStoreTypeSelected(formData, 'Hypermarket') ? parseInt(formData.hypermarket_radio_percentage) || 0 : 0,
            open_days_per_month: parseInt(formData.openDays) || 0
          },
          
          // On-site channels
          on_site_channels: getSelectedChannels(formData, 'onSiteChannels'),
          website_visitors: isChannelSelected(formData, 'onSiteChannels', 'Website') ? parseInt(formData.websiteVisitors) || 0 : 0,
          app_users: isChannelSelected(formData, 'onSiteChannels', 'Mobile App') ? parseInt(formData.appUsers) || 0 : 0,
          loyalty_users: isChannelSelected(formData, 'onSiteChannels', 'Loyalty Program') ? parseInt(formData.loyaltyUsers) || 0 : 0,
          
          // Off-site channels
          off_site_channels: getSelectedChannels(formData, 'offSiteChannels'),
          facebook_followers: isChannelSelected(formData, 'offSiteChannels', 'Facebook Business') ? parseInt(formData.facebookFollowers) || 0 : 0,
          instagram_followers: isChannelSelected(formData, 'offSiteChannels', 'Instagram Business') ? parseInt(formData.instagramFollowers) || 0 : 0,
          google_views: isChannelSelected(formData, 'offSiteChannels', 'Google Business Profile') ? parseInt(formData.googleViews) || 0 : 0,
          email_subscribers: isChannelSelected(formData, 'offSiteChannels', 'Email') ? parseInt(formData.emailSubscribers) || 0 : 0,
          sms_users: isChannelSelected(formData, 'offSiteChannels', 'SMS') ? parseInt(formData.smsUsers) || 0 : 0,
          whatsapp_contacts: isChannelSelected(formData, 'offSiteChannels', 'WhatsApp') ? parseInt(formData.whatsappContacts) || 0 : 0,
          
          // Preserve existing calculation results if they exist
          potential_reach_in_store: 0,
          unique_impressions_in_store: 0,
          potential_reach_on_site: 0,
          unique_impressions_on_site: 0,
          potential_reach_off_site: 0,
          unique_impressions_off_site: 0
        };
        
        // Write the updated config back to the file
        const updatedConfig = JSON.stringify(configData, null, 2);
        
        fs.writeFile(configPath, updatedConfig, 'utf8', (writeErr) => {
          if (writeErr) {
            reject(new Error(`Failed to write to config file: ${writeErr.message}`));
            return;
          }
          
          resolve();
        });
      } catch (parseError) {
        reject(new Error(`Failed to parse config file: ${parseError.message}`));
      }
    });
  });
}

// Helper function to check if a channel is selected
function isChannelSelected(formData, channelType, channelName) {
  const selectedChannels = getSelectedChannels(formData, channelType);
  return selectedChannels.includes(channelName);
}

// Helper function to get selected channels from form data
function getSelectedChannels(formData, channelType) {
  console.log(`Getting selected channels for ${channelType} from formData:`, formData[channelType]);
  
  let channels = [];
  
  if (formData[channelType]) {
    if (Array.isArray(formData[channelType])) {
      channels = formData[channelType];
    } else {
      channels = [formData[channelType]];
    }
  }
  
  console.log(`Selected ${channelType}:`, channels);
  return channels;
}

// Helper function to check if a store type is selected
function isStoreTypeSelected(formData, storeType) {
  const selectedTypes = getSelectedStoreTypes(formData);
  return selectedTypes.includes(storeType);
}

// Helper function to get selected store types from form data
function getSelectedStoreTypes(formData) {
  console.log('Getting selected store types from formData:', formData);
  
  // Check if storeTypes is an array or single value
  let storeTypes = [];
  
  if (formData.storeTypes) {
    if (Array.isArray(formData.storeTypes)) {
      storeTypes = formData.storeTypes;
    } else {
      storeTypes = [formData.storeTypes];
    }
  }
  
  console.log('Selected store types:', storeTypes);
  return storeTypes;
}

// Function to fetch config.json
async function fetchConfig() {
  return new Promise((resolve, reject) => {
    fs.readFile(path.join(__dirname, 'config.json'), 'utf8', (err, data) => {
      if (err) {
        reject(new Error(`Failed to read config file: ${err.message}`));
        return;
      }
      
      try {
        const config = JSON.parse(data);
        resolve(config);
      } catch (parseError) {
        reject(new Error(`Failed to parse config file: ${parseError.message}`));
      }
    });
  });
}

// For Node.js environment, export the functions
if (typeof module !== 'undefined' && module.exports) {
  module.exports = {
    updateConfig,
    fetchConfig
  };
}