/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const {
  ObjectProvider,
} = require("resource://devtools/client/shared/components/tree/ObjectProvider.js");

/**
 * Custom tree provider.
 *
 * This provider is used to provide set of headers and is
 * utilized by the HeadersPanel.
 * The default ObjectProvider can't be used since it doesn't
 * allow duplicities by design and so it can't support duplicity
 * headers (more headers with the same name).
 */
var HeadersProvider = {
  ...ObjectProvider,

  getChildren(object) {
    if (object && object.value instanceof HeaderList) {
      return object.value.headers.map(
        (header, index) => new Header(header.name, header.value, index)
      );
    }
    return ObjectProvider.getChildren(object);
  },

  hasChildren(object) {
    if (object.value instanceof HeaderList) {
      return !!object.value.headers.length;
    } else if (object instanceof Header) {
      return false;
    }
    return ObjectProvider.hasChildren(object);
  },

  getLabel(object) {
    if (object instanceof Header) {
      return object.name;
    }
    return ObjectProvider.getLabel(object);
  },

  getValue(object) {
    if (object instanceof Header) {
      return object.value;
    }
    return ObjectProvider.getValue(object);
  },

  getKey(object) {
    if (object instanceof Header) {
      return object.key;
    }
    return ObjectProvider.getKey(object);
  },

  getType(object) {
    if (object instanceof Header) {
      return "string";
    }
    return ObjectProvider.getType(object);
  },
};

/**
 * Helper data structures for list of headers.
 */
function HeaderList(headers) {
  // Clone, so the sort doesn't affect the original array.
  this.headers = headers.slice(0);
  this.headers.sort((a, b) => {
    return a.name.toLowerCase().localeCompare(b.name.toLowerCase());
  });
}

function Header(name, value, key) {
  this.name = name;
  this.value = value;
  this.key = key;
}

module.exports = {
  HeadersProvider,
  HeaderList,
};
