// Global variables
var jsuUpdating=false;
var lastSatList;

function setSelections(id,selections,save) {
  if (selections==null) { selections=new Array(); }
  if (save==null) { save=1; }
  var selElem=document.getElementById(id);
  var selList=new Array();
  var selValue;
  var newOpt;
  var lastOpt;
  var chkVal;

  // Save the current selections
  if (save) {
    for (i=0; i<selElem.length; i++) {
      selValue=selElem[i].value;
      if (selElem[i].selected) {
        selList[selValue]=1;
      }
      else {
        selList[selValue]=0;
      }
    }
  }
  // Clear the list
  for (i=selElem.length; i>=0; i--) { selElem.options[i]=null; }
  // Repopulate the list
  for (key in selections) {
    lastOpt=selElem.length;
    newOpt=new Option();
    newOpt.text=key;
    newOpt.value=selections[key];
    selElem.options[lastOpt]=newOpt;
  }

  if (id=='SEL_satellite' && (lastSatList==null || lastSatList=='')) return;

  // Reset saved selections
  var gotOne=false;
  for (i=0; i<selElem.length; i++) {
    chkVal=selElem[i].value;
    if (save && selList[chkVal]!=1) { selElem[i].selected=false; }
    else {
      selElem[i].selected=true;
      gotOne=true;
    }
  }

  // If no saved selections found, pick them all
//  if (!gotOne || getSetAllSelections(id)) {
  if (getSetAllSelections(id)) {
    for (i=0; i<selElem.length; i++) {
      selElem[i].selected=true;
    }
  }
}

function getSelectionsAll(id) {
  var selElem=document.getElementById(id);
  var selList=new Array();
  var getAll=false;
  for (i=0; i<selElem.length; i++) {
    selText=selElem[i].text;
    selList[selText]=selElem[i].value;
  }
  return(selList);
}

function getSelectionsAllFlat(id) {
  var selList=getSelectionsAll(id);
  var selText='';
  for (key in selList) { selText+=selList[key]+','; }
  selText=selText.replace(/,$/,'');
  return(selText);
}

function getSelections(id,all_as_none) {
  var selElem=document.getElementById(id);
  var selList=new Array();
  var getAll=false;
  if (selElem.selectedIndex<0 && all_as_none==null) { getAll=true; }
  for (i=0; i<selElem.length; i++) {
    if (getAll || selElem[i].selected) {
      selText=selElem[i].text;
      selList[selText]=selElem[i].value;
    }
  }
  return(selList);
}

function getSelectionsFlat(id,all_as_none) {
  var selList=getSelections(id,all_as_none);
  var selText='';
  for (key in selList) { selText+=selList[key]+','; }
  selText=selText.replace(/,$/,'');
  return(selText);
}

function updateSelections(id,selections) {
  var selElem=document.getElementById(id);
  // Set selected
  for (i=0; i<selElem.length; i++) {
    chkText=selElem[i].text;
    for (j=0; j<selections.length; j++) {
      if (selections[j]=='') continue;
      theRegExp = new RegExp(selections[j], "i")
      if (chkText.match(theRegExp)) { selElem[i].selected=true; }
    }
  }
}

// Interactively update the selection lists via AJAX
function JSUpdateSelect(id) {
  jsuStart();
  switch (id) {
  case 'TXT_datesingle':
    getDates('TXT_datesingle');
    break;
  case 'TXT_datefrom':
  case 'TXT_dateto':
    getDates('TXT_datefrom','TXT_dateto');
    break;
  case 'SEL_satellite':
    updateType();
    break;
  case 'SEL_type':
    updateCoverage();
    break;
  case 'SEL_coverage':
    updateSchedule();
    break;
  case 'SEL_schedule':
    updateSearchButton();
    break;
  case 'CHK_type':
    var checkElem=getElemAllSelections(id);
    if (!isEnabled(checkElem) && getSelectionsFlat(checkElem.id)=='') return;
    setAllType();
    updateCoverage();
    break;
  case 'CHK_coverage':
    var checkElem=getElemAllSelections(id);
    if (!isEnabled(checkElem) && getSelectionsFlat(checkElem.id)=='') return;
    setAllCoverage();
    updateSchedule();
    break;
  case 'CHK_schedule':
    var checkElem=getElemAllSelections(id);
    if (!isEnabled(checkElem) && getSelectionsFlat(checkElem.id)=='') return;
    setAllSchedule();
    updateSearchButton();
    break;
  default:
    alert('Unknown id passed to JSUpdateSelect: '+id);
    jsuEnd();
    break;
  }
}

function updateSatellite() {
  lastSatList=getSelectionsFlat('SEL_satellite',1);
  getSatellites(
    getDateListFlat()
  );
}

function updatedSatellite() {
  jsuUpdating=0;
  setSelections('SEL_type',null);
  setSelections('SEL_coverage',null);
  setSelections('SEL_schedule',null);
  setEnabled('SEL_satellite');
//  checkDoSearch();
}

function updateSubpoint() {
  getSubpoint(
    getDateListFlat(),
    getSelectionsFlat('SEL_satellite')
  );
}

function updateType() {
  var satList=getSelectionsFlat('SEL_satellite');
  var dateList=getDateListFlat();
  if (dateList!='|' && satList=='') {
    setSelections('SEL_satellite');
    setSelections('SEL_type');
    setSelections('SEL_coverage');
    setSelections('SEL_schedule');
    clearSubpoint();
    jsuEnd();
    alert('No satellites available for the given date(s)');
    return(false);
  }
  updateSubpoint();
  var satList=getSelectionsFlat('SEL_satellite',1);
  if (satList=='') {
    setEnabled('SEL_satellite');
    setDisabled('SEL_type');
    setSelections('SEL_type');
    setDisabled('SEL_coverage');
    setSelections('SEL_coverage');
    setDisabled('SEL_schedule');
    setSelections('SEL_schedule');
    setDisabled('BUT_search');
  }
  else {
    getTypes(
      dateList,
      satList
    );
  }
}

function updateCoverage() {
  typeList=getSelectionsFlat('SEL_type',1);
  if (typeList=='') {
    setEnabled('SEL_satellite');
    if (!getSetAllSelections('type')) setEnabled('SEL_type');
    setDisabled('SEL_coverage');
    setSelections('SEL_coverage');
    setDisabled('SEL_schedule');
    setSelections('SEL_schedule');
    setDisabled('BUT_search');
  }
  else {
    getCoverages(
      getDateListFlat(),
      getSelectionsFlat('SEL_satellite'),
      typeList
    );
  }
}

function updateSchedule() {
  coverageList=getSelectionsFlat('SEL_coverage',1);
  if (coverageList=='') {
    setEnabled('SEL_satellite');
    if (!getSetAllSelections('type')) setEnabled('SEL_type');
    if (!getSetAllSelections('coverage')) setEnabled('SEL_coverage');
    setDisabled('SEL_schedule');
    setSelections('SEL_schedule');
    setDisabled('BUT_search');
  }
  else {
    getSchedules(
      getDateListFlat(),
      getSelectionsFlat('SEL_satellite'),
      getSelectionsFlat('SEL_type'),
      coverageList
    );
  }
}

function updateSearchButton() {
  scheduleList=getSelectionsFlat('SEL_schedule',1);
  if (scheduleList=='') {
    setEnabled('SEL_satellite');
    if (!getSetAllSelections('type')) setEnabled('SEL_type');
    if (!getSetAllSelections('coverage')) setEnabled('SEL_coverage');
    if (!getSetAllSelections('schedule')) setEnabled('SEL_schedule');
    if (getSetAllSelections('schedule')) setEnabled('BUT_search');
    else setDisabled('BUT_search');
  }
  else {
    setEnabled('BUT_search');
  }
  jsuEnd();
}

function getSetAllSelections(id) {
  var checkId='CHK_'+id.replace(/^..._/,'');
  var chkElem=document.getElementById(checkId);
  if (chkElem==null) return(false);
  if (chkElem.checked) return(true);
  return(false);
}
function getElemAllSelections(id) {
  var checkId='SEL_'+id.replace(/^..._/,'');
  var chkElem=document.getElementById(checkId);
  if (chkElem==null) return(false);
  return(chkElem);
}

function setAllType() {
  if (getSetAllSelections('type')) {
    setCookie('ALL_type',1);
    setSelections('SEL_type',getSelectionsAll('SEL_type'));
    setDisabled('SEL_type');
  }
  else {
    setCookie('ALL_type',0);
    setEnabled('SEL_type');
  }
}

function setAllCoverage() {
  if (getSetAllSelections('coverage')) {
    setCookie('ALL_coverage',1);
    setSelections('SEL_coverage',getSelectionsAll('SEL_coverage'));
    setDisabled('SEL_coverage');
  }
  else {
    setCookie('ALL_coverage',0);
    setEnabled('SEL_coverage');
  }
}

function setAllSchedule() {
  if (getSetAllSelections('schedule')) {
    setCookie('ALL_schedule',1);
    setSelections('SEL_schedule',getSelectionsAll('SEL_schedule'));
    setDisabled('SEL_schedule');
  }
  else {
    setCookie('ALL_schedule',0);
    setEnabled('SEL_schedule');
  }
}

function jsuStart() {
  jsuUpdating=1;
  setDisabledAll();
}

function jsuEnd() {
  jsuUpdating=0;
  setEnabledAll();
  checkDoSearch();
}

function setDisabledAll() {
  setDisabled('SEL_satellite');
  setDisabled('SEL_type');
  setDisabled('SEL_coverage');
  setDisabled('SEL_schedule');
  setDisabled('BUT_search');
}
function setEnabledAll() {
  setEnabled('SEL_satellite');
  if (!getSetAllSelections('type')) setEnabled('SEL_type');
  if (!getSetAllSelections('coverage')) setEnabled('SEL_coverage');
  if (!getSetAllSelections('schedule')) setEnabled('SEL_schedule');
//  setEnabled('BUT_search');
}