export class Dates {
  public static isValidYear(yearString){
    // First check for the pattern
    if(!/^\d{4}$/.test(yearString))
        return false;
        var year = parseInt(yearString, 10);

        // Check the ranges of month and year
        if(year < 1000 || year > 3000 )
            return false;
        return true;
  }
  //format YYYY-MM-DD
  public static isValidDate(dateString:string)
  {
      // First check for the pattern
      if(!/^\d{4}\-\d{1,2}\-\d{1,2}$/.test(dateString))
          return false;

      // Parse the date parts to integers
      var parts = dateString.split("-");
      var day = parseInt(parts[2], 10);
      var month = parseInt(parts[1], 10);
       var year = parseInt(parts[0], 10);
      if(!this.isValidYear(parts[0])){
        return false;
      }

      // Check the ranges of month and year
      if( month == 0 || month > 12)
          return false;

      var monthLength = [ 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31 ];

      // Adjust for leap years
      if(year % 400 == 0 || (year % 100 != 0 && year % 4 == 0))
          monthLength[1] = 29;

      // Check the range of the day
      return day > 0 && day <= monthLength[month - 1];

  }
  public static getDateToday():Date{
    var myDate = new Date();
    return myDate;

  }
  public static getDateToString(myDate:Date):string{
    var date:string = myDate.getFullYear()+ "-" ;
     date+=((myDate.getMonth() + 1)<10)?"0"+(myDate.getMonth() + 1):(myDate.getMonth() + 1) ;
     date+="-";
     date+=  (myDate.getDate() <10 )? "0"+myDate.getDate():myDate.getDate() ;
     return date;

  }
  public static getDateXMonthsAgo(x:number):Date{
    var myDate = new Date();
    myDate.setMonth(myDate.getMonth() - x);
    return myDate;

  }
  public static getDateXYearsAgo(x:number):Date{
    var myDate = new Date();
    myDate.setFullYear(myDate.getFullYear() - x);
    return myDate;

  }
  public static getDateFromString(date:string):Date{

    var myDate = new Date();
    myDate.setFullYear(+date.substring(0,4));
    myDate.setMonth(+date.substring(5,7)-1);
    myDate.setDate(+date.substring(8,11))
    return myDate;

  }

}

export class DOI{

  public static getDOIsFromString(str:string):string[]{
    var DOIs:string[] = [];
    var words:string[] = str.split(" ");

    for(var i=0; i< words.length; i++){
        if(DOI.isValidDOI(words[i]) && DOIs.indexOf(words[i]) == -1){
          DOIs.push(words[i]);
        }
    }
    return DOIs;
  }
  public static isValidDOI(str:string):boolean{

      var exp1 = /\b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'<>])\S)+)\b/g
      var exp2 = /\b(10[.][0-9]{4,}(?:[.][0-9]+)*\/(?:(?!["&\'<>])[[:graph:]])+)\b/g
      if(str.match(exp1)!=null || str.match(exp2)!=null){
        // console.log("It's a DOI");
        return true;
      }
      return false;

  }
}
export class StringUtils{
  public static quote(params: string):string {
      return '"'+params+'"';
  }

  public static unquote(params: string):string {
     if(params.length > 2 && (params[0]=='"' && params[params.length-1]=='"') || (params[0]=="'" && params[params.length-1]=="'")){
      params= params.substring(1, params.length-1);
    }
      return params;
  }
  public static URIEncode(params: string):string {
      return encodeURIComponent(params);
  }
  public static URIDecode(params: string):string {
      return decodeURIComponent(params);
  }
  public static  b64DecodeUnicode(str) {
      return decodeURIComponent(Array.prototype.map.call(atob(str), function(c) {
          return '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2);
      }).join(''));
  }


}