class code {
  constructor(name,version){
    this.name=name
    this.version=version
  }
}
class basis {
  constructor(name,type){
    this.name=name
    this.type=type
  }
}

class state{
  constructor(number,multiplicity,symetry){
    this.number=number;
    this.multiplicity=multiplicity;
    this.symetry=symetry;
  }
}
class doi{
  constructor(doistring){
    this.string=doistring
  }
  get url() {
    return 'https://doi.org/'+doi 
  }
}
class excitation{
  constructor(start,end,Evert){
    this.start=start;
    this.end=end;
    this.Evert=Evert;
  }
}

class data {
  constructor(){
    this.title="";
    this.code=null;
    this.basis=null;
    this.doi=null;
    this.excitations=[];
  }
  static load(file,fn) {
    var req = new XMLHttpRequest();
    req.open("GET",getFullDataPath(file), true);
    req.onreadystatechange = function() { 
      if (req.readyState == 4 && req.status == 200) {//when a good response is given do this
        var text = req.responseText;
        fn(data.loadstring(text));
      }
    }
    req.send();
  }
  static loadstring(text) {
    // for each line with metadata
    var ismetaArea=true;
    //metadata RegExp (start with #; maybe somme spaces; : ; maybe somme space; datas)
    var meta=/^#\s*([A-Za-z]+)\s*:\s*(.*)$/;
    var dat=new data();
    function readmeta(line){
      // get key value
      var match=line.match(meta);
      // normalize key to lower
      var key=match[1].toLowerCase();
      //if data has value
      if(match.length==3 && match[2]) {
        var val=match[2];
        switch(key) {
          case "title":
            dat.title=val;
            break;
          case "code":
            var vals=val.split(",")
            if(vals.length>=2){
              dat.code=new code(vals[0],vals[1]);
            } else {
              dat.code=new code(vals[0],null);
            }
            break;
          case "basis":
            var vals=val.split(",")
            if(vals.length>=2){
              dat.basis=new basis(vals[0],vals[1])
            } else {
              dat.basis=new basis(vals[0],null);
            }
            break;
          case "doi":
            dat.doi=new doi(val);
            break;
        }
      }
    }
    function readrow(line){
      var vals=line.split(/\s+/);             
      var start=new state(vals[0],vals[1],vals[2]);
      var end=new state(vals[3],vals[4],vals[5]);
      var ex=new excitation(start,end,vals[6]);
      dat.excitations.push(ex);
    };

    text.split("\n").forEach(function(line) { 
      //if it's not empty line
      line=line.trim();
      if (line){
        //if # may be metadata or comment
        if (line.charAt(0)=="#") {
          //if it's metadata
          if(ismetaArea && meta.test(line)) {
            readmeta(line);
          }				
        } else { //else its row
          ismetaArea=false;
          readrow(line);
        }
      }
    });
    return dat
  }
}