(function () {

  var duplicateSlots = window.duplicateSlots = function () {

  };

  // this variable will contain all the org details, and filled

  // incrementally

  var orgs_details = {};

  // this variable will contain all student/proposal data details,

  // filled incrementally

  var assigned_proposals = [];

  // public function to output actual HTML out of the data (cached or not)

  duplicateSlots.showDuplicatesHtml =

    function (orgs_details, student, student_key, proposals) {

      /*jslint undef:false */

      if (html_string === '') {

        jQuery("#div_duplicate_slots").html('');

        html_string = '<ul>';

      }

      html_string += [

        '<li>',

        '  Student: ',

        '    <strong>',

        '      <a href="/student/show/', student_key, '">', student.name,

        '</a>',

        '    </strong> ',

        '(<a href="mailto:', student.contact, '">', student.contact, '</a>)'

      ].join("");

      html_string += '<ul>';

      jQuery(proposals).each(

        function (intIndex, proposal) {

          html_string += [

            '<li>',

            '  Organization: ',

            '    <a href="/org/show/', proposal.org_key, '">',

            orgs_details[proposal.org_key].name,

            '</a>, admin: ', orgs_details[proposal.org_key].admin_name,

            ' (<a href="mailto:',

            orgs_details[proposal.org_key].admin_email,

            '">',

            orgs_details[proposal.org_key].admin_email, '</a>)</li>'

          ].join("");

          html_string += [

            '<ul>',

            '  <li>',

            'Proposal: ',

            '<a href="/student_proposal/show/', proposal.proposal_key, '">',

            proposal.proposal_title, '</a>',

            '  </li>',

            '</ul>'

          ].join("");

        }

      );

      html_string += '</ul></li>';

      html_string += '</ul>';

      jQuery("#div_duplicate_slots").html(html_string);

      /*jslint undef:true */

    };

  // private function to generate the JSON to send for caching and calling

  // the actual function that will print the data

  function printDuplicatesAndSendJSON() {

    // JSON skeleton that need to be sent to the server

    var to_json = {

      "data": {

        "orgs" : orgs_details,

        "students": {}

      }

    };

    // for every student...

    jQuery.each(assigned_proposals, function (student_key, student) {

      var accepted_proposals = student.proposals.length;

      // if accepted proposal are less than 2, then ignore and

      // continue the iteration

      if (accepted_proposals < 2) {

        return true;

      }

      // push this student to the caching JSON

      to_json.data.students[student_key] = student;

      var proposals = student.proposals;

      // call the function that prints the output html

      duplicateSlots.showDuplicatesHtml(

        orgs_details, student, student_key, proposals

      );

    });

    /*jslint undef:false */

    if (html_string === "") {

    /*jslint undef:true */

      jQuery("#div_duplicate_slots")

        .html("<strong>No duplicate slots found</strong>");

    }

    // at the end, send the JSON for caching purposes

    jQuery.ajax({

      url: location.href,

      type: 'POST',

      processData: true,

      data: {result: JSON.stringify(to_json)},

      contentType: 'application/json',

      dataType: 'json'

    });

  }

  // private function to load a JSON and pushing the data to the

  // private global variables

  function loadSingleJSONData(data) {

    if (data) {

      // pushing org details

      jQuery.each(data.data.orgs, function (org_key, organization) {

        orgs_details[org_key] = organization;

      });

      // pushing proposals

      jQuery(data.data.proposals).each(

        function (intIndex, proposal) {

          // if this student_key is not yet present

          if (assigned_proposals[proposal.student_key] === undefined) {

            // create the object and insert general info

            assigned_proposals[proposal.student_key] = {};

            assigned_proposals[proposal.student_key].name =

              proposal.student_name;

            assigned_proposals[proposal.student_key].contact =

              proposal.student_contact;

            assigned_proposals[proposal.student_key].proposals = [];

          }

          // anyway, push the accepted proposals

          assigned_proposals[proposal.student_key].proposals.push(

            {

              "org_key" : proposal.org_key,

              "proposal_key" : proposal.key_name,

              "proposal_title": proposal.proposal_title

            }

          );

        }

      );

    }

  }

  function showDuplicates(url_to_query, OFFSET_LENGTH, NUMBER_OF_ORGS) {

    var current_offset = 0;

    orgs_details = {};

    assigned_proposals = [];

    // Here Ajax call is handled

    setTimeout(

      function () {

        jQuery.ajax({

          cache: false,

          mode: "sync",

          type: "GET",

          timeout: 1000000,

          dataType: "json",

          url: [

            "/program/assigned_proposals/", url_to_query,

            "?limit=", OFFSET_LENGTH,

            "&offset=", current_offset

          ].join(""),

          success: function (data, textStatus) {

            if (data) {

              // Load JSON data

              loadSingleJSONData(data);

            }

          },

          error: function (XMLHttpRequest, textStatus, errorThrown) {

            // if there is an error return the button and

            // leave a try again message

            if (XMLHttpRequest !== undefined) {

              jQuery("#id_button_duplicate_slots").fadeIn("slow",

                function () {

                  jQuery("#description_done").html([

                    "<strong class='error'> ",

                    "Error encountered, try again",

                    "</strong>"

                  ].join(""));

                }

              );

            }

          }

        });

        current_offset += OFFSET_LENGTH;

        if (current_offset < NUMBER_OF_ORGS) {

          setTimeout(arguments.callee, 1);

        }

      },

      1

    );

    // This prevent page reloading after each ajax call

    return false;

  }

  // public function to begin iterating load of JSONs and then call printing

  // of duplicates

  duplicateSlots.showDuplicatesInit = function () {

    /*jslint undef:false */

    html_string = '';

    // Remember this object for Javascript scoping

    var this_object = this;

    var NUMBER_OF_ORGS = number_of_orgs;

    var OFFSET_LENGTH = offset_length;

    // Variables to handle progress bar updating

    var ITERATIONS = (number_of_orgs % offset_length) === 0 ?

      Math.floor(number_of_orgs / offset_length) :

      Math.floor(number_of_orgs / offset_length) + 1;

    /*jslint undef:true */

    if (ITERATIONS === 0) {

      jQuery("#div_duplicate_slots")

        .html("<strong>No org slots to process</strong>");

      return;

    }

    var successful_calls = 0;

    jQuery("#id_button_duplicate_slots").fadeOut("slow",

      function () {

        jQuery("#duplicates_progress_bar").progressBar(0);

        jQuery("#description_done").html("");

        // For every ajax success, bind this function to update user feedback

        jQuery(this).bind("ajaxSuccess", function () {

          successful_calls++;

          var percentage = Math.floor(100 * (successful_calls) / (ITERATIONS));

          jQuery("#duplicates_progress_bar").progressBar(percentage);

          jQuery("#description_progressbar").html([

            " Processed orgs chunk ", successful_calls, "/", ITERATIONS

          ].join(""));

          // If this is the last call, feedback the user and

          // print the duplicates data

          if (successful_calls === ITERATIONS) {

            jQuery("#applications_progress_bar").fadeOut("slow",

              function () {

                jQuery("#duplicates_progress_bar").progressBar(0);

                jQuery("#id_button_duplicate_slots").fadeIn("slow");

              }

            );

            jQuery("#description_progressbar").html("");

            jQuery("#description_done").html("<strong> Done!</strong>");

            jQuery("#duplicates_progress_bar").fadeOut("slow",

              function () {

                jQuery("#id_button_duplicate_slots").val("Recalculate").fadeIn(

                  "slow",

                  function () {

                    // Call printing to HTML function with correct scope

                    printDuplicatesAndSendJSON.call(this_object);

                  }

                );

              }

            );

          }

        });

        // Call the showDuplicates function for the first time

        // with correct scope

        jQuery("#duplicates_progress_bar").fadeIn(

          "slow",

          showDuplicates.apply(

            this_object,

            /*jslint undef:false */

            [url_to_query, OFFSET_LENGTH, NUMBER_OF_ORGS]

            /*jslint undef:true */

          )

        );

      }

    );

  };

}());