/**
   * Django admin inlines
   *
   * Based on jQuery Formset 1.1
   * @author Stanislaus Madueke (stan DOT madueke AT gmail DOT com)
   * @requires jQuery 1.2.6 or later
   *
   * Copyright (c) 2009, Stanislaus Madueke
   * All rights reserved.
   *
   * Spiced up with Code from Zain Memon's GSoC project 2009
   * and modified for Django by Jannis Leidel, Travis Swicegood and Julien Phalip.
   *
   * Licensed under the New BSD License
   * See: http://www.opensource.org/licenses/bsd-license.php
   */
  (function($) {
    $.fn.formset = function(opts) {
      var options = $.extend({}, $.fn.formset.defaults, opts);
      var $this = $(this);
      var $parent = $this.parent();
      var updateElementIndex = function(el, prefix, ndx) {
        var id_regex = new RegExp("(" + prefix + "-(\\d+|__prefix__))");
        var replacement = prefix + "-" + ndx;
        if ($(el).prop("for")) {
          $(el).prop("for", $(el).prop("for").replace(id_regex, replacement));
        }
        if (el.id) {
          el.id = el.id.replace(id_regex, replacement);
        }
        if (el.name) {
          el.name = el.name.replace(id_regex, replacement);
        }
      };
      var totalForms = $("#id_" + options.prefix + "-TOTAL_FORMS").prop("autocomplete", "off");
      var nextIndex = parseInt(totalForms.val(), 10);
      var maxForms = $("#id_" + options.prefix + "-MAX_NUM_FORMS").prop("autocomplete", "off");
      // only show the add button if we are allowed to add more items,
          // note that max_num = None translates to a blank string.
      var showAddButton = maxForms.val() === '' || (maxForms.val()-totalForms.val()) > 0;
      $this.each(function(i) {
        $(this).not("." + options.emptyCssClass).addClass(options.formCssClass);
      });
      if ($this.length && showAddButton) {
        var addButton;
        if ($this.prop("tagName") == "TR") {
          // If forms are laid out as table rows, insert the
          // "add" button in a new table row:
          var numCols = this.eq(-1).children().length;
          $parent.append('<tr class="' + options.addCssClass + '"><td colspan="' + numCols + '"><a href="javascript:void(0)">' + options.addText + "</a></tr>");
          addButton = $parent.find("tr:last a");
        } else {
          // Otherwise, insert it immediately after the last form:
          $this.filter(":last").after('<div class="' + options.addCssClass + '"><a href="javascript:void(0)">' + options.addText + "</a></div>");
          addButton = $this.filter(":last").next().find("a");
        }
        addButton.click(function(e) {
          e.preventDefault();
          var totalForms = $("#id_" + options.prefix + "-TOTAL_FORMS");
          var template = $("#" + options.prefix + "-empty");
          var row = template.clone(true);
          row.removeClass(options.emptyCssClass)
            .addClass(options.formCssClass)
            .attr("id", options.prefix + "-" + nextIndex);
          if (row.is("tr")) {
            // If the forms are laid out in table rows, insert
            // the remove button into the last table cell:
            row.children(":last").append('<div><a class="' + options.deleteCssClass +'" href="javascript:void(0)">' + options.deleteText + "</a></div>");
          } else if (row.is("ul") || row.is("ol")) {
            // If they're laid out as an ordered/unordered list,
            // insert an <li> after the last list item:
            row.append('<li><a class="' + options.deleteCssClass +'" href="javascript:void(0)">' + options.deleteText + "</a></li>");
          } else {
            // Otherwise, just insert the remove button as the
            // last child element of the form's container:
            row.children(":first").append('<span><a class="' + options.deleteCssClass + '" href="javascript:void(0)">' + options.deleteText + "</a></span>");
          }
          row.find("*").each(function() {
            updateElementIndex(this, options.prefix, totalForms.val());
          });
          // Insert the new form when it has been fully edited
          row.insertBefore($(template));
          // Update number of total forms
          $(totalForms).val(parseInt(totalForms.val(), 10) + 1);
          nextIndex += 1;
          // Hide add button in case we've hit the max, except we want to add infinitely
          if ((maxForms.val() !== '') && (maxForms.val()-totalForms.val()) <= 0) {
            addButton.parent().hide();
          }
          // The delete button of each row triggers a bunch of other things
          row.find("a." + options.deleteCssClass).click(function(e) {
            e.preventDefault();
            // Remove the parent form containing this button:
            var row = $(this).parents("." + options.formCssClass);
            row.remove();
            nextIndex -= 1;
            // If a post-delete callback was provided, call it with the deleted form:
            if (options.removed) {
              options.removed(row);
            }
            // Update the TOTAL_FORMS form count.
            var forms = $("." + options.formCssClass);
            $("#id_" + options.prefix + "-TOTAL_FORMS").val(forms.length);
            // Show add button again once we drop below max
            if ((maxForms.val() === '') || (maxForms.val()-forms.length) > 0) {
              addButton.parent().show();
            }
            // Also, update names and ids for all remaining form controls
            // so they remain in sequence:
            for (var i=0, formCount=forms.length; i<formCount; i++)
            {
              updateElementIndex($(forms).get(i), options.prefix, i);
              $(forms.get(i)).find("*").each(function() {
                updateElementIndex(this, options.prefix, i);
              });
            }
          });
          // If a post-add callback was supplied, call it with the added form:
          if (options.added) {
            options.added(row);
          }
        });
      }
      return this;
    };
  
    /* Setup plugin defaults */
    $.fn.formset.defaults = {
      prefix: "form",          // The form prefix for your django formset
      addText: "add another",      // Text for the add link
      deleteText: "remove",      // Text for the delete link
      addCssClass: "add-row",      // CSS class applied to the add link
      deleteCssClass: "delete-row",  // CSS class applied to the delete link
      emptyCssClass: "empty-row",    // CSS class applied to the empty row
      formCssClass: "dynamic-form",  // CSS class applied to each form in a formset
      added: null,          // Function called each time a new form is added
      removed: null          // Function called each time a form is deleted
    };
  
  
    // Tabular inlines ---------------------------------------------------------
    $.fn.tabularFormset = function(options) {
      var $rows = $(this);
      var alternatingRows = function(row) {
        $($rows.selector).not(".add-row").removeClass("row1 row2")
          .filter(":even").addClass("row1").end()
          .filter(":odd").addClass("row2");
      };
  
      var reinitDateTimeShortCuts = function() {
        // Reinitialize the calendar and clock widgets by force
        if (typeof DateTimeShortcuts != "undefined") {
          $(".datetimeshortcuts").remove();
          DateTimeShortcuts.init();
        }
      };
  
      var updateSelectFilter = function() {
        // If any SelectFilter widgets are a part of the new form,
        // instantiate a new SelectFilter instance for it.
        if (typeof SelectFilter != 'undefined'){
          $('.selectfilter').each(function(index, value){
            var namearr = value.name.split('-');
            SelectFilter.init(value.id, namearr[namearr.length-1], false, options.adminStaticPrefix );
          });
          $('.selectfilterstacked').each(function(index, value){
            var namearr = value.name.split('-');
            SelectFilter.init(value.id, namearr[namearr.length-1], true, options.adminStaticPrefix );
          });
        }
      };
  
      var initPrepopulatedFields = function(row) {
        row.find('.prepopulated_field').each(function() {
          var field = $(this),
              input = field.find('input, select, textarea'),
              dependency_list = input.data('dependency_list') || [],
              dependencies = [];
          $.each(dependency_list, function(i, field_name) {
            dependencies.push('#' + row.find('.field-' + field_name).find('input, select, textarea').attr('id'));
          });
          if (dependencies.length) {
            input.prepopulate(dependencies, input.attr('maxlength'));
          }
        });
      };
  
      $rows.formset({
        prefix: options.prefix,
        addText: options.addText,
        formCssClass: "dynamic-" + options.prefix,
        deleteCssClass: "inline-deletelink",
        deleteText: options.deleteText,
        emptyCssClass: "empty-form",
        removed: alternatingRows,
        added: function(row) {
          initPrepopulatedFields(row);
          reinitDateTimeShortCuts();
          updateSelectFilter();
          alternatingRows(row);
        }
      });
  
      return $rows;
    };
  
    // Stacked inlines ---------------------------------------------------------
    $.fn.stackedFormset = function(options) {
      var $rows = $(this);
      var updateInlineLabel = function(row) {
        $($rows.selector).find(".inline_label").each(function(i) {
          var count = i + 1;
          $(this).html($(this).html().replace(/(#\d+)/g, "#" + count));
        });
      };
  
      var reinitDateTimeShortCuts = function() {
        // Reinitialize the calendar and clock widgets by force, yuck.
        if (typeof DateTimeShortcuts != "undefined") {
          $(".datetimeshortcuts").remove();
          DateTimeShortcuts.init();
        }
      };
  
      var updateSelectFilter = function() {
        // If any SelectFilter widgets were added, instantiate a new instance.
        if (typeof SelectFilter != "undefined"){
          $(".selectfilter").each(function(index, value){
            var namearr = value.name.split('-');
            SelectFilter.init(value.id, namearr[namearr.length-1], false, options.adminStaticPrefix);
          });
          $(".selectfilterstacked").each(function(index, value){
            var namearr = value.name.split('-');
            SelectFilter.init(value.id, namearr[namearr.length-1], true, options.adminStaticPrefix);
          });
        }
      };
  
      var initPrepopulatedFields = function(row) {
        row.find('.prepopulated_field').each(function() {
          var field = $(this),
              input = field.find('input, select, textarea'),
              dependency_list = input.data('dependency_list') || [],
              dependencies = [];
          $.each(dependency_list, function(i, field_name) {
            dependencies.push('#' + row.find('.form-row .field-' + field_name).find('input, select, textarea').attr('id'));
          });
          if (dependencies.length) {
            input.prepopulate(dependencies, input.attr('maxlength'));
          }
        });
      };
  
      $rows.formset({
        prefix: options.prefix,
        addText: options.addText,
        formCssClass: "dynamic-" + options.prefix,
        deleteCssClass: "inline-deletelink",
        deleteText: options.deleteText,
        emptyCssClass: "empty-form",
        removed: updateInlineLabel,
        added: (function(row) {
          initPrepopulatedFields(row);
          reinitDateTimeShortCuts();
          updateSelectFilter();
          updateInlineLabel(row);
        })
      });
  
      return $rows;
    };
  })(django.jQuery);