/* begin: validate form */
function isQueryValid(thisForm){
  with(thisForm){
    if (!(query.value || exact_q.value || any_q.value)){
      return 0;
    }
  }
  return 1;
}
function isLeapYear(year){
  if (year%4){ return 0; }
  if (!(year%100) && year%400){ return 0; }
  return 1;
}
function isDateValid(thisForm){
  with(thisForm){
    if (date_fromto.checked){
      days = [[31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31], [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]];
      var month, year, isLeap, maxDays;

      month = s_date_month.options[s_date_month.selectedIndex].value;
      year = s_date_year.options[s_date_year.selectedIndex].value;
      isLeap = isLeapYear(parseInt(year));
      maxDays = days[isLeap][parseInt(month)-1];
      while (parseInt(s_date_day.options[s_date_day.selectedIndex].value) > maxDays){
        s_date_day.options[s_date_day.selectedIndex-1].selected = 1;
      }
      var s_date = year+month+s_date_day.options[s_date_day.selectedIndex].value;
      
      month = e_date_month.options[e_date_month.selectedIndex].value;
      year = e_date_year.options[e_date_year.selectedIndex].value;
      isLeap = isLeapYear(parseInt(year));
      maxDays = days[isLeap][parseInt(month)-1];
      if (parseInt(e_date_day.options[e_date_day.selectedIndex].value) > maxDays){
        e_date_day.options[maxDays].selected = 1;
      }
      var e_date = year+month+e_date_day.options[e_date_day.selectedIndex].value;
      
      if (s_date > e_date){
        return 0;
      }
    }
  }
  return 1;
}
function validateForm(){  
  var flag = 1;
  var frontForm = document.search;  
  var lang = 0;
  if (frontForm.ui_lang.value == "en") lang = 0;
  if (frontForm.ui_lang.value == "zh-hk") lang = 1;
  if (frontForm.ui_lang.value == "zh-cn") lang = 2;

  /* avoid null query */
  /*  if (!isQueryValid(frontForm)){ alert(alertMsg[0][lang]); flag = 0;} */
  if (!isQueryValid(frontForm)){ alert(alertMsg[0]); flag = 0;} 
  var backForm = document.adv_search_backend;
  /* avoid start date > end date */
  /* if (!isDateValid(backForm)){ alert(alertMsg[1][lang]); flag = 0;} */
  /* if (!isDateValid(backForm)){ alert(alertMsg[1]); flag = 0;} */

  return flag;
}
/* end:validate form */

/* begin: submit form */
function trimForm(){

  var frontForm = document.search;

  with (frontForm){
    /* query related data */
    init_query.value = encodeURIComponent(query.value);
    init_exact_q.value = encodeURIComponent(exact_q.value);
    init_any_q.value = encodeURIComponent(any_q.value);
    init_none_q.value = encodeURIComponent(none_q.value);

    var backForm = document.adv_search_backend;
    with (backForm){
      
      /* doc type related data */
      doc_type.value = file_type.value;
      /* display related data */
      p_size.value = page_size.value;

      /* trim date related data */
      /*if (date_any.checked){
        last_mod.value=date_any.value;
      }else{
        if (date_within.checked){
          last_mod.value = date_last.options[date_last.selectedIndex].value;
        }else{
          if (date_fromto.checked){
            last_mod.value = 
              s_date_year.options[s_date_year.selectedIndex].value +
              s_date_month.options[s_date_month.selectedIndex].value +
              s_date_day.options[s_date_day.selectedIndex].value +
              "," +
              e_date_year.options[e_date_year.selectedIndex].value +
              e_date_month.options[e_date_month.selectedIndex].value +
              e_date_day.options[e_date_day.selectedIndex].value;
          }
        }
      }*/

      /* trim language related data */
      /*
      if (lga_any.checked){
        // any language 
        r_lang.value = lga_any.value;
      }else{
        if (lga_other.checked){
          if (lga_en.checked && lga_ch.checked){
            r_lang.value = lga_any.value;
          }else{
            if (lga_en.checked){
              r_lang.value = lga_en.value;
            }
            if (lga_ch.checked){
              r_lang.value = lga_ch.value;
            }
          }
        }
      }
      */
      /***** modified - assign language to r_lang directly  ******/
      if (lga_any.checked){
          r_lang.value = lga_any.value;
      }else{
          if (lga_en.checked){
             r_lang.value = lga_en.value;
          }
          if (lga_ch.checked){
             r_lang.value = lga_ch.value;
          }
      }
            
      /* trim website related data */
      var flag = true;
      if (wb_all.checked){
        /* all websites */
        gp1.value = "0";
        web.value = "all";
      }else{
        gp1.value = "";
        web.value = "this";
        if (wb_this.checked){
          /* this website */
          gp1.value = gp0.value;
        }else{
          if (wb_section.checked){
            /* within some sections */
            for (var i = 0; i < wb_section_v.length; i++){
              if (wb_section_v[i].checked){
                /* select all */
                if (flag){
                  flag = !flag;
                }else{
                  gp1.value += ",";
                }
                gp1.value += wb_section_v[i].value;
              }
            }
          }
        }
      } 
    }
  }
  return true;
}
/* end: submit form */