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var SearchService = "";

(function($) {
  /**
   * A super class of common logics for all search services
   * @param options : (object)
   */
  SearchService = function(options) {
    var self = this;
    
    self.config = $.extend({
      per_page: 10,
      selectors: {
        body: "body",
        form: ".u-search-form",
        input: ".u-search-input",
        container: "#u-search",
        modal: "#u-search .modal",
        modal_body: "#u-search .modal-body",
        modal_footer: "#u-search .modal-footer",
        modal_overlay: "#u-search .modal-overlay",
        modal_results: "#u-search .modal-results",
        modal_metadata: "#u-search .modal-metadata",
        modal_error: "#u-search .modal-error",
        modal_loading_bar: "#u-search .modal-loading-bar",
        modal_ajax_content: "#u-search .modal-ajax-content",
        modal_logo: '#u-search .modal-footer .logo',
        btn_close: "#u-search .btn-close",
        btn_next: "#u-search .btn-next",
        btn_prev: "#u-search .btn-prev"
      },
      brands: {
        'google': {logo: '/img/google.svg', url: 'https://cse.google.com'},
        'algolia': {logo: '/img/algolia.svg', url: 'https://www.algolia.com'},
        'hexo': {logo: '', url: ''},
        'azure': {logo: '/img/azure.svg', url: 'https://azure.microsoft.com/en-us/services/search/'},
        'baidu': {logo: '/img/baidu.svg', url: 'http://zn.baidu.com/cse/home/index'}
      }
    }, options);

    self.dom = {};
    self.percentLoaded = 0;
    self.open = false;
    self.queryText = "";
    self.nav = {
      next: -1,
      prev: -1,
      total: 0,
      current: 1
    };

    self.parseSelectors = function() {
      for (var key in self.config.selectors) {
        self.dom[key] = $(self.config.selectors[key]);
      }
    };

    self.beforeQuery = function() {
      if (!self.open) {
        self.dom.container.fadeIn();
        self.dom.body.addClass('modal-active');
      }
      self.dom.input.each(function(index,elem) {
        $(elem).val(self.queryText);
      });
      document.activeElement.blur();
      self.dom.modal_error.hide();
      self.dom.modal_ajax_content.removeClass('loaded');
      self.startLoading();
    };
    
    self.afterQuery = function() {
      self.dom.modal_body.scrollTop(0);
      self.dom.modal_ajax_content.addClass('loaded');
      self.stopLoading();
    };

    /**
     * Perform a complete serach operation including UI updates and query
     * @param startIndex {int} start index or page number
     */
    self.search = function(startIndex, callback) {
      self.beforeQuery();
      if (self.search instanceof Function) {
        self.query(self.queryText, startIndex, function() {
          self.afterQuery();
        });
      }
      else {
        console.log("query() does not exist.");
        self.onQueryError(self.queryText, '');
        self.afterQuery();
      }
    };

    /**
     * Query error handler
     * @param queryText: (string)
     * @param status: (string)
     */
    self.onQueryError = function(queryText, status) {
      var errMsg = "";
      if (status === "success") errMsg = "No result found for \"" +queryText+ "\".";
      else if (status === "timeout") errMsg = "Unfortunate timeout.";
      else errMsg = "Mysterious failure.";
      self.dom.modal_results.html("");
      self.dom.modal_error.html(errMsg);
      self.dom.modal_error.show();
    };
    
    self.nextPage = function() {
      if (self.nav.next !== -1) {
        self.search(self.nav.next);
      }
    };
    
    self.prevPage = function() {
      if (self.nav.prev !== -1) {
        self.search(self.nav.prev);
      }
    };
    
    /**
     * Generate html for one result
     * @param url : (string) url
     * @param title : (string) title
     * @param digest : (string) digest
     */
    self.buildResult = function(url, title, digest) {
      var html = "";
      html = "<li>";
      html +=   "<a class='result' href='" +url+ "'>";
      html +=     "<span class='title'>" +title+ "</span>";
      html +=     "<span class='digest'>" +digest+ "</span>";
      html +=     "<span class='icon icon-chevron-thin-right'></span>";
      html +=   "</a>";
      html += "</li>";
      return html;
    };
    
    /**
     * Close the modal, resume body scrolling
     * no param
     */
    self.close = function() {
      self.open = false;
      self.dom.container.fadeOut();
      self.dom.body.removeClass('modal-active');
    };
    
    /**
     * Searchform submit event handler
     * @param queryText : (string) the query text
     */
    self.onSubmit = function(event) {
      event.preventDefault();
      self.queryText = $(this).find('.u-search-input').val();
      if (self.queryText) {
        self.search(1);
      }
    };
    
    /**
     * Start loading bar animation
     * no param
     */
    self.startLoading = function() {
      self.dom.modal_loading_bar.show();
      self.loadingTimer = setInterval(function() { 
        self.percentLoaded = Math.min(self.percentLoaded+5,95);
        self.dom.modal_loading_bar.css('width', self.percentLoaded+'%');
      }, 100);
    };
    
    /**
     * Stop loading bar animation
     * no param
     */
    self.stopLoading = function() {
      clearInterval(self.loadingTimer);
      self.dom.modal_loading_bar.css('width', '100%');
      self.dom.modal_loading_bar.fadeOut();
      setTimeout(function() {
        self.percentLoaded = 0;
        self.dom.modal_loading_bar.css('width', '0%');
      }, 300);
    };

    /**
     * Add service branding
     * @param service {String} service name
     */
    self.addLogo = function(service) {
      var html = "";
      if (self.config.brands[service] && self.config.brands[service].logo) {
        html += "<a href='" +self.config.brands[service].url+ "' class='" +service+ "'>";
        html +=    '<img src="' +self.config.brands[service].logo+ '" />';
        html += "</a>";
        self.dom.modal_logo.html(html);
      }
    };

    self.destroy = function() {
      self.dom.form.each(function(index,elem) {
        $(elem).off('submit');
      });
      self.dom.modal_overlay.off('click');
      self.dom.btn_close.off('click');
      self.dom.btn_next.off('click');
      self.dom.btn_prev.off('click');
      self.dom.container.remove();
    };
    
    /**
     * Load template and register event handlers
     * no param
     */
    self.init = function() {
      $('body').append(template);
      self.parseSelectors();
      self.dom.form.each(function(index,elem) {
        $(elem).on('submit', self.onSubmit);
      });
      self.dom.modal_overlay.on('click', self.close);
      self.dom.btn_close.on('click', self.close);
      self.dom.btn_next.on('click', self.nextPage);
      self.dom.btn_prev.on('click', self.prevPage);
    };

    self.init();

    return self;
  };

  var template = '<div id="u-search"><div class="modal"> <header class="modal-header" class="clearfix"><form id="u-search-modal-form" class="u-search-form" name="uSearchModalForm"> <input type="text" id="u-search-modal-input" class="u-search-input" /> <button type="submit" id="u-search-modal-btn-submit" class="u-search-btn-submit"> <span class="icon icon-search"></span> </button></form> <a class="btn-close"> <span class="icon icon-close"></span> </a><div class="modal-loading"><div class="modal-loading-bar"></div></div> </header> <main class="modal-body"><ul class="modal-results modal-ajax-content"></ul> </main> <footer class="modal-footer clearfix"><div class="modal-metadata modal-ajax-content"> <strong class="range"></strong> of <strong class="total"></strong></div><div class="modal-error"></div> <div class="logo"></div> <a class="nav btn-next modal-ajax-content"> <span class="text">NEXT</span> <span class="icon icon-chevron-right"></span> </a> <a class="nav btn-prev modal-ajax-content"> <span class="icon icon-chevron-left"></span> <span class="text">PREV</span> </a> </footer></div><div class="modal-overlay"></div></div>';
})(jQuery);