/* -*- Mode: Java; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* Copyright 2012 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

'use strict';

/* globals PDFFindController, FindStates, mozL10n */

/**
 * Creates a "search bar" given set of DOM elements
 * that act as controls for searching, or for setting
 * search preferences in the UI. This object also sets
 * up the appropriate events for the controls. Actual
 * searching is done by PDFFindController
 */
var PDFFindBar = {

  opened: false,
  bar: null,
  toggleButton: null,
  findField: null,
  highlightAll: null,
  caseSensitive: null,
  findMsg: null,
  findStatusIcon: null,
  findPreviousButton: null,
  findNextButton: null,

  initialize: function(options) {
    if(typeof PDFFindController === 'undefined' || PDFFindController === null) {
        throw 'PDFFindBar cannot be initialized ' +
            'without a PDFFindController instance.';
    }

    this.bar = options.bar;
    this.toggleButton = options.toggleButton;
    this.findField = options.findField;
    this.highlightAll = options.highlightAllCheckbox;
    this.caseSensitive = options.caseSensitiveCheckbox;
    this.findMsg = options.findMsg;
    this.findStatusIcon = options.findStatusIcon;
    this.findPreviousButton = options.findPreviousButton;
    this.findNextButton = options.findNextButton;

    var self = this;
    this.toggleButton.addEventListener('click', function() {
      self.toggle();
    });

    this.findField.addEventListener('input', function() {
      self.dispatchEvent('');
    });

    this.bar.addEventListener('keydown', function(evt) {
      switch (evt.keyCode) {
        case 13: // Enter
          if (evt.target === self.findField) {
            self.dispatchEvent('again', evt.shiftKey);
          }
          break;
        case 27: // Escape
          self.close();
          break;
      }
    });

    this.findPreviousButton.addEventListener('click',
      function() { self.dispatchEvent('again', true); }
    );

    this.findNextButton.addEventListener('click', function() {
      self.dispatchEvent('again', false);
    });

    this.highlightAll.addEventListener('click', function() {
      self.dispatchEvent('highlightallchange');
    });

    this.caseSensitive.addEventListener('click', function() {
      self.dispatchEvent('casesensitivitychange');
    });
  },

  dispatchEvent: function(aType, aFindPrevious) {
    var event = document.createEvent('CustomEvent');
    event.initCustomEvent('find' + aType, true, true, {
      query: this.findField.value,
      caseSensitive: this.caseSensitive.checked,
      highlightAll: this.highlightAll.checked,
      findPrevious: aFindPrevious
    });
    return window.dispatchEvent(event);
  },

  updateUIState: function(state, previous) {
    var notFound = false;
    var findMsg = '';
    var status = '';

    switch (state) {
      case FindStates.FIND_FOUND:
        break;

      case FindStates.FIND_PENDING:
        status = 'pending';
        break;

      case FindStates.FIND_NOTFOUND:
        findMsg = mozL10n.get('find_not_found', null, 'Phrase not found');
        notFound = true;
        break;

      case FindStates.FIND_WRAPPED:
        if (previous) {
          findMsg = mozL10n.get('find_reached_top', null,
                      'Reached top of document, continued from bottom');
        } else {
          findMsg = mozL10n.get('find_reached_bottom', null,
                                'Reached end of document, continued from top');
        }
        break;
    }

    if (notFound) {
      this.findField.classList.add('notFound');
    } else {
      this.findField.classList.remove('notFound');
    }

    this.findField.setAttribute('data-status', status);
    this.findMsg.textContent = findMsg;
  },

  open: function() {
    if (!this.opened) {
      this.opened = true;
      this.toggleButton.classList.add('toggled');
      this.bar.classList.remove('hidden');
    }

    this.findField.select();
    this.findField.focus();
  },

  close: function() {
    if (!this.opened) return;

    this.opened = false;
    this.toggleButton.classList.remove('toggled');
    this.bar.classList.add('hidden');

    PDFFindController.active = false;
  },

  toggle: function() {
    if (this.opened) {
      this.close();
    } else {
      this.open();
    }
  }
};