/**
 * /script/admin.js
 * @version 1.3
 * @desc Javascript file for the admin submenu
 * @author Fándly Gergő Zoltán (fandlygergo@gmail.hu, systemtest.tk)
 * @copy 2017 Fándly Gergő Zoltán
 * License:
    Result Manager for managing results of students in bilingual school systems.
    Copyright (C) 2017  Fándly Gergő Zoltán

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <https://www.gnu.org/licenses/>.
 **/

function adminImportUsers(){
    //hide all status messages if any shown
    $("#statuses").children().each(function(){
        $(this).css("display", "none");
    });
    
    //get file
    var file=$("#csvFile")[0].files[0];
    
    //if greater than 10MB don't upload
    if(file.size>10000000){
        $("#status_fileTooBig").slideDown();
        return;
    }
    else{
        $("#status_uploading").slideDown(function(){
            //generate form data
            var data=new FormData();
            data.append("import_file", file);
            
            //run ajax upload request
            $.ajax({
                url: "./subs/loader.php?load=admin&backend",
                type: "POST",
                data: data,
                cache: false,
                contentType: false,
                processData: false,
                xhr: function(){
                    var myXHR=$.ajaxSettings.xhr();
                    if(myXHR.upload){
                        myXHR.upload.addEventListener("progress", function(e){
                            if(e.lengthComputable){
                                //calculate percent with 1 decimal precision
                                var percent=Math.round(e.loaded*100/e.total*10)/10;
                                percent=percent.toString()+"%";
                                
                                //upload progressbar
                                $("#uploadStatus").children("div").css("width", percent);
                                $("#uploadStatus").children("div").children("span").text(percent);
                            }
                        });
                    }
                    return myXHR;
                },
                success: function(response){
                    $("#status_uploading").slideUp();
                    
                    //something went wrong during the upload
                    if(response=="error"){
                        loadMessages();
                        $("#status_uploadError").slideDown();
                    }
                    else{
                        //everything ok so far
                        $("#status_processing").slideDown();
                        
                        //start listener that checks processing status (run every 500ms)
                        var progressChecker=setInterval(function(){
                            $.ajax({
                                url: "./subs/loader.php",
                                type: "GET",
                                data: {"load":"admin", "backend":true, "import_progress":response},
                                success: function(response2){
                                    //update progressbar
                                    $("#processStatus").children("div").css("width", response2);
                                    $("#processStatus").children("div").children("span").text(response2);
                                }
                            });
                        }, 500);
                        
                        //start processing of file with ajax
                        $.ajax({
                            url: "./subs/loader.php?load=admin&backend",
                            type: "POST",
                            data: {"process_file":response},
                            success: function(response2){
                                //import complete
                                $("#status_processing").slideUp();
                                $("#status_done").slideDown();
                                
                                //stop progress checker
                                clearInterval(progressChecker);
                            }
                        });
                    }
                }
            });
        });
    }
}