//funzione che definisce tutti gli elementi responsabili dell'apertura di un file.
//Sono definiti quindi l'albero e il bottone per l'importazione da locale
function setImportFile(){

  //genero e leggo il contenuto della directory "filesystem"
  var jsonResponse: any;
  var xmlListingFile: any = new XMLHttpRequest();
  xmlListingFile.open("GET", "https://baltig.infn.it/api/v4/projects/819/repository/tree?recursive=1&path=XRF-File-System", false);
  xmlListingFile.onreadystatechange = function(){
    if(xmlListingFile.readyState === 4){
      if(xmlListingFile.status === 200){
        jsonResponse = JSON.parse(xmlListingFile.responseText);
      }
    }
  }
  xmlListingFile.send(null);

  //ora genero l'albero e definisco l'evento in caso di selezione di un nodo
  $('#FileTreeview').treeview({data: generateTree(jsonResponse)});
  $('#FileTreeview').on('nodeSelected', function(e, node){
    if(node['url'] != undefined){
      $("#load-spinner").css("display", "inline");
      openFileFromServer(node['url']);
    }
  });

  //bottone per l'importazione locale
  var fileInputButton: any = document.getElementById('myImport'); 
  fileInputButton.onchange = function(){
    $("#load-spinner").css("display", "inline");
    var fileName: string = fileInputButton.files[0];
    var readerObject: any = new FileReader();
    readerObject.readAsBinaryString(fileName);  
    readerObject.onload = function() {
      var fileString: string = readerObject.result;
      readData(fileString);
    }
  }

}

//funzione che genera automaticamente l'albero
function generateTree(jsonDoc){

  var tree: any = [ {
    text:"XRF-File-System",
    nodes: [ ]
  }];

  //scorro ogni elemento dell'albero
  for (var i: number = 0; i < jsonDoc.length; i++) {
    if(jsonDoc[i].type == "tree"){ //è una cartella      
      var Folder = {  //definisco l'oggetto Folder
        text: jsonDoc[i].name,
        relativePath: jsonDoc[i].path, 
        nodes: []
      }
      insertOBJinFS(Folder, tree);
    } else { //è un file
      var File = { //definisco l'oggetto File
        text: jsonDoc[i].name,
        relativePath: jsonDoc[i].path,
        icon: "glyphicon glyphicon-file",
        selectedIcon: "glyphicon glyphicon-file",
        url: jsonDoc[i].path
      }
      //inserisco il file nella giusta posizione
      insertOBJinFS(File, tree);
    }
  }

  return tree;

} 

//funzione che posiziona l'oggetto passato in input nell'albero
function insertOBJinFS(objfs, tree){

  //tree[0].nodes.push(objfs);

  var parentPath: string = objfs.relativePath.slice(0, objfs.relativePath.lastIndexOf("/"));
  //se l'oggetto è figlio della radice lo colloco subito
  if(parentPath == tree[0].text){
    tree[0].nodes.push(objfs);
  } else {
    //ricavo la profondità e posiziono l'oggetto
    var splitPath: string[] = parentPath.split("/");
    var depth: number = splitPath.length;
    switch(depth){
      case 2:
        var partialParentPath: string = splitPath[0]+"/"+splitPath[1];
        for (var i: number = 0; i < tree[0].nodes.length; i++){
          if(partialParentPath == tree[0].nodes[i].relativePath){
            tree[0].nodes[i].nodes.push(objfs);
            break;
          }
        }
      break;

      case 3:
        var partialParentPath: string = splitPath[0]+"/"+splitPath[1];
        for (var i: number = 0; i < tree[0].nodes.length; i++){
          if(partialParentPath == tree[0].nodes[i].relativePath){
            partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2];
            for (var j: number = 0; j < tree[0].nodes[i].nodes.length; j++){
              if(partialParentPath == tree[0].nodes[i].nodes[j].relativePath){
                tree[0].nodes[i].nodes[j].nodes.push(objfs);
                break;
              }
            }
            break;
          }
        }
      break;

      case 4:
        var partialParentPath: string = splitPath[0]+"/"+splitPath[1];
        for (var i: number = 0; i < tree[0].nodes.length; i++){
          if(partialParentPath == tree[0].nodes[i].relativePath){
            partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2];
            for (var j: number = 0; j < tree[0].nodes[i].nodes.length; j++){
              if(partialParentPath == tree[0].nodes[i].nodes[j].relativePath){
                partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2]+"/"+splitPath[3];
                for (var k: number = 0; k < tree[0].nodes[i].nodes[j].nodes.length; k++){
                  if(partialParentPath == tree[0].nodes[i].nodes[j].nodes[k].relativePath){
                    tree[0].nodes[i].nodes[j].nodes[k].nodes.push(objfs);
                    break;
                  }
                }
                break;
              }
            }
            break;
          }
        }
      break;

      case 5:
        var partialParentPath: string = splitPath[0]+"/"+splitPath[1];
        for (var i: number = 0; i < tree[0].nodes.length; i++){
          if(partialParentPath == tree[0].nodes[i].relativePath){
            partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2];
            for (var j: number = 0; j < tree[0].nodes[i].nodes.length; j++){
              if(partialParentPath == tree[0].nodes[i].nodes[j].relativePath){
                partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2]+"/"+splitPath[3];
                for (var k: number = 0; k < tree[0].nodes[i].nodes[j].nodes.length; k++){
                  if(partialParentPath == tree[0].nodes[i].nodes[j].nodes[k].relativePath){
                    partialParentPath = splitPath[0]+"/"+splitPath[1]+"/"+splitPath[2]+"/"+splitPath[3]+"/"+splitPath[4];
                    for (var l: number = 0; l < tree[0].nodes[i].nodes[j].nodes[k].nodes.length; l++){
                      if(partialParentPath == tree[0].nodes[i].nodes[j].nodes[k].nodes[l].relativePath){
                        tree[0].nodes[i].nodes[j].nodes[k].nodes[l].nodes.push(objfs);
                        break;
                      }
                    }
                    break;
                  }
                }
                break;
              }
            }
            break;
          }
        }
      break;
    }
  }

}

//funzione che dato l'url di un file, lo apre e lo legge passandone il contenuto
//alla funzione readData(). Questa funzione è invocata quando viene selezionato
//un file dall'albero
function openFileFromServer(url){

  console.log("Try to open " + url.slice(url.lastIndexOf("/")+1, url.length));
  url = "https://baltig.infn.it/api/v4/projects/819/repository/files/" + encodeURIComponent(url) + "?ref=master";
  var jsonContentFile: any = new XMLHttpRequest();
  jsonContentFile.open("GET", url, false);
  jsonContentFile.onreadystatechange = function(){
    if(jsonContentFile.readyState === 4){
      if(jsonContentFile.status === 200){
        var jsonResponse: string = jsonContentFile.responseText;
        var startPoint: number = jsonResponse.indexOf("content") + 10;
        var endPoint: number = jsonResponse.indexOf("\", :ref");
        readData(atob(jsonResponse.slice(startPoint, endPoint)));
      }
    }
  }
  jsonContentFile.send(null);

}