/**
 * Legacy API Integration Service
 *
 * This service handles communication with the Legacy WellNuo API
 * at eluxnetworks.net for device management and deployments.
 */

const axios = require('axios');

const LEGACY_API_BASE = 'https://eluxnetworks.net/function/well-api/api';

/**
 * Room location codes mapping
 * These numeric codes are used by Legacy API to identify room types
 */
const ROOM_LOCATIONS = {
  'Bedroom': 102,
  'Living Room': 103,
  'Kitchen': 104,
  'Bathroom': 105,
  'Hallway': 106,
  'Office': 107,
  'Garage': 108,
  'Dining Room': 109,
  'Basement': 110,
  'Other': 200
};

const LOCATION_NAMES = Object.fromEntries(
  Object.entries(ROOM_LOCATIONS).map(([k, v]) => [v, k])
);

/**
 * Get authentication token from Legacy API
 * @param {string} username - Legacy API username
 * @param {string} password - Legacy API password
 * @returns {Promise<string>} Access token
 */
async function getLegacyToken(username, password) {
  const formData = new URLSearchParams({
    function: 'credentials',
    user_name: username,
    ps: password,
    clientId: '001',
    nonce: Date.now().toString()
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  if (response.data.status !== '200 OK') {
    throw new Error('Legacy API authentication failed');
  }

  return response.data.access_token;
}

/**
 * Create deployment in Legacy API
 * @param {object} params - Deployment parameters
 * @param {string} params.username - Installer username
 * @param {string} params.token - Access token
 * @param {string} params.beneficiaryName - Full name
 * @param {string} params.beneficiaryEmail - Email
 * @param {string} params.beneficiaryUsername - Login username
 * @param {string} params.beneficiaryPassword - Password
 * @param {string} params.address - Address
 * @param {string} params.caretakerUsername - Caretaker username
 * @param {string} params.caretakerEmail - Caretaker email
 * @param {number} params.persons - Number of persons
 * @param {number} params.pets - Number of pets
 * @param {string} params.gender - Gender
 * @param {number} params.race - Race index
 * @param {number} params.born - Year born
 * @param {number} params.lat - GPS latitude
 * @param {number} params.lng - GPS longitude
 * @param {Array<string>} params.wifis - WiFi credentials ["SSID|password", ...]
 * @param {Array<number>} params.devices - Device well_ids [497, 523]
 * @returns {Promise<number>} Created deployment_id
 */
async function createLegacyDeployment(params) {
  // 1x1 pixel JPEG as base64 - required by Legacy API
  const MINI_PHOTO = '/9j/4AAQSkZJRgABAQEASABIAAD/2wBDAAgGBgcGBQgHBwcJCQgKDBQNDAsLDBkSEw8UHRofHh0aHBwgJC4nICIsIxwcKDcpLDAxNDQ0Hyc5PTgyPC4zNDL/2wBDAQkJCQwLDBgNDRgyIRwhMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjIyMjL/wAARCAABAAEDASIAAhEBAxEB/8QAFQABAQAAAAAAAAAAAAAAAAAAAAn/xAAUEAEAAAAAAAAAAAAAAAAAAAAA/8QAFQEBAQAAAAAAAAAAAAAAAAAAAAX/xAAUEQEAAAAAAAAAAAAAAAAAAAAA/9oADAMBAAIRAxEAPwCwAB//2Q==';

  // Minimal params - exactly like working Postman request
  const formData = new URLSearchParams({
    function: 'set_deployment',
    user_name: params.username,
    token: params.token,
    deployment: 'NEW',
    beneficiary_name: params.beneficiaryName,
    beneficiary_email: params.beneficiaryEmail,
    beneficiary_user_name: params.beneficiaryUsername,
    beneficiary_password: params.beneficiaryPassword,
    beneficiary_address: params.address || 'test',
    beneficiary_photo: MINI_PHOTO,
    firstName: 'Test',
    lastName: 'User',
    first_name: 'Test',
    last_name: 'User',
    new_user_name: params.beneficiaryUsername,
    phone_number: '+10000000000',
    key: params.beneficiaryPassword,
    signature: 'Test',
    gps_age: '0',
    wifis: '[]',
    devices: '[]'
  });


  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });


  if (response.data.status !== '200 OK') {
    throw new Error(`Failed to create deployment in Legacy API: ${response.data.status || JSON.stringify(response.data)}`);
  }

  // Extract deployment_id from response
  // Response format varies, need to handle different cases
  // Note: Current Legacy API returns only {ok: 1, status: "200 OK"} without deployment_id
  const deploymentId = response.data.deployment_id || response.data.result || response.data.well_id;

  if (!deploymentId) {
  }

  return deploymentId;
}

/**
 * Assign device to deployment (set well_id)
 * @param {string} username - Username
 * @param {string} token - Access token
 * @param {number} deviceId - Internal device ID
 * @param {number} wellId - Well ID to assign
 * @param {string} mac - Device MAC address
 * @returns {Promise<boolean>} Success status
 */
async function assignDeviceToDeployment(username, token, deviceId, wellId, mac) {
  const formData = new URLSearchParams({
    function: 'device_set_well_id',
    user_name: username,
    token: token,
    device_id: deviceId,
    well_id: wellId,
    mac: mac.toUpperCase().replace(/:/g, '')
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  return response.data.success === true;
}

/**
 * Update device location/room
 * @param {string} username - Username
 * @param {string} token - Access token
 * @param {number} wellId - Device well_id
 * @param {string} deviceMac - MAC address
 * @param {string} roomName - Room name (Bedroom, Kitchen, etc.)
 * @param {object} options - Additional options
 * @param {string} options.description - Device description
 * @param {string} options.closeTo - Position description
 * @param {number} options.radarThreshold - Radar sensitivity (0-100)
 * @param {number} options.group - Group ID
 * @returns {Promise<boolean>} Success status
 */
async function updateDeviceLocation(username, token, wellId, deviceMac, roomName, options = {}) {
  const locationCode = ROOM_LOCATIONS[roomName] || ROOM_LOCATIONS['Other'];

  const formData = new URLSearchParams({
    function: 'device_form',
    user_name: username,
    token: token,
    well_id: wellId,
    device_mac: deviceMac.toUpperCase().replace(/:/g, ''),
    location: locationCode.toString(),
    description: options.description || '',
    close_to: options.closeTo || '',
    radar_threshold: options.radarThreshold || 50,
    group: options.group || 0
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  return response.data.status === '200 OK';
}

/**
 * Get devices for deployment (only recently active)
 * @param {string} username - Username
 * @param {string} token - Access token
 * @param {number} deploymentId - Deployment ID
 * @param {boolean} onlineOnly - If true, return only online devices (fresh=true)
 * @returns {Promise<Array>} List of devices
 */
async function getDeploymentDevices(username, token, deploymentId, onlineOnly = true) {
  const formData = new URLSearchParams({
    function: 'request_devices',
    user_name: username,
    token: token,
    deployment_id: deploymentId,
    group_id: 'All',
    location: 'All',
    fresh: onlineOnly ? 'true' : 'false'
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  if (response.data.status !== '200 OK') {
    return [];
  }

  // Parse device array format:
  // [device_id, well_id, MAC, timestamp, location, description, deployment_id]
  const devices = response.data.result_list || [];

  return devices.map(device => ({
    deviceId: device[0],
    wellId: device[1],
    mac: device[2],
    lastSeen: device[3],
    locationCode: device[4],
    locationName: LOCATION_NAMES[device[4]] || 'Unknown',
    description: device[5],
    deploymentId: device[6],
    isOnline: true // If fresh=true was used, all returned devices are online
  }));
}

/**
 * Reboot device
 * @param {string} username - Username
 * @param {string} token - Access token
 * @param {number} deviceId - Device ID
 * @returns {Promise<boolean>} Success status
 */
async function rebootDevice(username, token, deviceId) {
  const formData = new URLSearchParams({
    function: 'device_reboot',
    user_name: username,
    token: token,
    device_id: deviceId
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  return response.data.status === '200 OK';
}

/**
 * Find deployment ID by beneficiary username
 * Used to retrieve deployment_id after creation (since set_deployment doesn't return it)
 * @param {string} adminUsername - Admin username
 * @param {string} adminToken - Admin access token
 * @param {string} beneficiaryUsername - Username of the beneficiary
 * @returns {Promise<number|null>} Deployment ID or null if not found
 */
async function findDeploymentByUsername(adminUsername, adminToken, beneficiaryUsername) {
  try {
    // Try logging in as the beneficiary user to get their deployment
    // Note: This requires knowing the beneficiary's password

    // Alternative: Use get_user_deployments if available
    const formData = new URLSearchParams({
      function: 'get_user_deployments',
      user_name: adminUsername,
      token: adminToken,
      target_username: beneficiaryUsername
    });

    const response = await axios.post(LEGACY_API_BASE, formData, {
      headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
    });


    if (response.data.status === '200 OK' && response.data.result_list) {
      // Return the first deployment ID
      const deployments = response.data.result_list;
      if (deployments.length > 0) {
        return deployments[0].deployment_id || deployments[0][0]; // Handle both object and array format
      }
    }

    return null;
  } catch (error) {
    return null;
  }
}

/**
 * Send email via Legacy API (eluxnetworks.net)
 * Uses the send_message function with method=email
 *
 * @param {object} params - Email parameters
 * @param {string} params.to - Recipient email address
 * @param {string} params.subject - Email subject
 * @param {string} params.content - Email content (HTML supported)
 * @returns {Promise<boolean>} Success status
 */
async function sendEmailViaLegacyAPI({ to, subject, content }) {
  const username = process.env.LEGACY_API_USERNAME;
  const password = process.env.LEGACY_API_PASSWORD;

  if (!username || !password) {
    throw new Error('Legacy API credentials not configured');
  }

  // Get fresh token
  const token = await getLegacyToken(username, password);

  const formData = new URLSearchParams({
    function: 'send_message',
    token: token,
    user_name: username,
    user_id_or_recepient: to,
    method: 'email',
    subject: subject,
    content: content
  });

  const response = await axios.post(LEGACY_API_BASE, formData, {
    headers: { 'Content-Type': 'application/x-www-form-urlencoded' }
  });

  if (response.data.ok !== true && response.data.status !== '200 OK') {
    throw new Error(`Failed to send email via Legacy API: ${JSON.stringify(response.data)}`);
  }

  return true;
}

module.exports = {
  getLegacyToken,
  createLegacyDeployment,
  findDeploymentByUsername,
  assignDeviceToDeployment,
  updateDeviceLocation,
  getDeploymentDevices,
  rebootDevice,
  sendEmailViaLegacyAPI,
  ROOM_LOCATIONS,
  LOCATION_NAMES
};