// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

/**
 * @fileoverview Polymer element for displaying the IP Config properties for
 * a network state. TODO(stevenjb): Allow editing of static IP configurations
 * when 'editable' is true.
 */
Polymer({
  is: 'network-ip-config',

  behaviors: [I18nBehavior],

  properties: {
    /**
     * The network properties dictionary containing the IP Config properties to
     * display and modify.
     * @type {!CrOnc.NetworkProperties|undefined}
     */
    networkProperties: {
      type: Object,
      observer: 'networkPropertiesChanged_',
    },

    /**
     * Whether or not the IP Address can be edited.
     */
    editable: {
      type: Boolean,
      value: false,
    },

    /**
     * State of 'Configure IP Addresses Automatically'.
     * @private
     */
    automatic_: {
      type: Boolean,
      value: true,
    },

    /**
     * The currently visible IP Config property dictionary. The 'RoutingPrefix'
     * property is a human-readable mask instead of a prefix length.
     * @private {{
     *   ipv4: (!CrOnc.IPConfigUIProperties|undefined),
     *   ipv6: (!CrOnc.IPConfigUIProperties|undefined)
     * }|undefined}
     */
    ipConfig_: Object,

    /**
     * Array of properties to pass to the property list.
     * @private {!Array<string>}
     */
    ipConfigFields_: {
      type: Array,
      value: function() {
        return [
          'ipv4.IPAddress',
          'ipv4.RoutingPrefix',
          'ipv4.Gateway',
          'ipv6.IPAddress',
        ];
      },
      readOnly: true
    },
  },

  /**
   * Saved static IP configuration properties when switching to 'automatic'.
   * @private {!CrOnc.IPConfigUIProperties|undefined}
   */
  savedStaticIp_: undefined,

  /**
   * Polymer networkProperties changed method.
   */
  networkPropertiesChanged_: function(newValue, oldValue) {
    if (!this.networkProperties)
      return;

    const properties = this.networkProperties;
    if (newValue.GUID != (oldValue && oldValue.GUID))
      this.savedStaticIp_ = undefined;

    // Update the 'automatic' property.
    if (properties.IPAddressConfigType) {
      const ipConfigType = CrOnc.getActiveValue(properties.IPAddressConfigType);
      this.automatic_ = (ipConfigType != CrOnc.IPConfigType.STATIC);
    }

    if (properties.IPConfigs || properties.StaticIPConfig) {
      // Update the 'ipConfig' property.
      const ipv4 = this.getIPConfigUIProperties_(
          CrOnc.getIPConfigForType(properties, CrOnc.IPType.IPV4));
      let ipv6 = this.getIPConfigUIProperties_(
          CrOnc.getIPConfigForType(properties, CrOnc.IPType.IPV6));
      if (properties.ConnectionState == CrOnc.ConnectionState.CONNECTED &&
          ipv4 && ipv4.IPAddress) {
        ipv6 = ipv6 || {};
        ipv6.IPAddress = ipv6.IPAddress || this.i18n('loading');
      }
      this.ipConfig_ = {ipv4: ipv4, ipv6: ipv6};
    } else {
      this.ipConfig_ = undefined;
    }
  },

  /** @private */
  onAutomaticChange_: function() {
    if (!this.automatic_) {
      const defaultIpv4 = {
        Gateway: '192.168.1.1',
        IPAddress: '192.168.1.1',
        RoutingPrefix: '255.255.255.0',
        Type: CrOnc.IPType.IPV4,
      };
      // Ensure that there is a valid IPConfig object. Copy any set properties
      // over the default properties to ensure all properties are set.
      if (this.ipConfig_)
        this.ipConfig_.ipv4 = Object.assign(defaultIpv4, this.ipConfig_.ipv4);
      else
        this.ipConfig_ = {ipv4: defaultIpv4};
      this.sendStaticIpConfig_();
      return;
    }

    // Save the static IP configuration when switching to automatic.
    if (this.ipConfig_)
      this.savedStaticIp_ = this.ipConfig_.ipv4;
    // Send the change.
    this.fire('ip-change', {
      field: 'IPAddressConfigType',
      value: CrOnc.IPConfigType.DHCP,
    });
  },

  /**
   * @param {!CrOnc.IPConfigProperties|undefined} ipconfig
   * @return {!CrOnc.IPConfigUIProperties|undefined} A new IPConfigUIProperties
   *     object with RoutingPrefix expressed as a string mask instead of a
   *     prefix length. Returns undefined if |ipconfig| is not defined.
   * @private
   */
  getIPConfigUIProperties_: function(ipconfig) {
    if (!ipconfig)
      return undefined;
    const result = {};
    for (const key in ipconfig) {
      const value = ipconfig[key];
      if (key == 'RoutingPrefix')
        result.RoutingPrefix = CrOnc.getRoutingPrefixAsNetmask(value);
      else
        result[key] = value;
    }
    return result;
  },

  /**
   * @param {!CrOnc.IPConfigUIProperties} ipconfig The IP Config UI properties.
   * @return {!CrOnc.IPConfigProperties} A new IPConfigProperties object with
   *     RoutingPrefix expressed as a a prefix length.
   * @private
   */
  getIPConfigProperties_: function(ipconfig) {
    const result = {};
    for (const key in ipconfig) {
      const value = ipconfig[key];
      if (key == 'RoutingPrefix')
        result.RoutingPrefix = CrOnc.getRoutingPrefixAsLength(value);
      else
        result[key] = value;
    }
    return result;
  },

  /**
   * @return {boolean}
   * @private
   */
  hasIpConfigFields_: function() {
    if (!this.ipConfigFields_)
      return false;
    for (let i = 0; i < this.ipConfigFields_.length; ++i) {
      if (this.get(this.ipConfigFields_[i], this.ipConfig_) != undefined)
        return true;
    }
    return false;
  },

  /**
   * @return {Object} An object with the edit type for each editable field.
   * @private
   */
  getIPEditFields_: function() {
    if (!this.editable || this.automatic_)
      return {};
    return {
      'ipv4.IPAddress': 'String',
      'ipv4.RoutingPrefix': 'String',
      'ipv4.Gateway': 'String'
    };
  },

  /**
   * Event triggered when the network property list changes.
   * @param {!{detail: {field: string, value: string}}} event The
   *     network-property-list change event.
   * @private
   */
  onIPChange_: function(event) {
    if (!this.ipConfig_)
      return;
    const field = event.detail.field;
    const value = event.detail.value;
    // Note: |field| includes the 'ipv4.' prefix.
    this.set('ipConfig_.' + field, value);
    this.sendStaticIpConfig_();
  },

  /** @private */
  sendStaticIpConfig_: function() {
    // This will also set IPAddressConfigType to STATIC.
    this.fire('ip-change', {
      field: 'StaticIPConfig',
      value: this.ipConfig_.ipv4 ?
          this.getIPConfigProperties_(this.ipConfig_.ipv4) :
          {}
    });
  },
});