/*
// Script:	searchForm.js
// Version:	0.08
// Description:
//          JavaScript functions used in the Cheshire3 EAD search/retrieve and display interface 
//          - part of Cheshire for Archives v3.x
//
// Language:  JavaScript
// Author:    John Harrison <john.harrison@liv.ac.uk>
// Date:      17 February 2009
//
// Copyright: &copy; University of Liverpool 2005-2009
//
// Version History:
// 0.01 - 03/08/2006 - JH - Search form DOM manipulation functions pasted in from previous script for easier error tracking etc.
// 0.02 - 24/10/2006 - JH - Additions for adding/removing phrase option to relation drop-down when necessary
// 0.03 - 11/12/2006 - JH - Mods for compatibility with IE7
//							- get elements by id rather than name wherever possible
//							- use innerHTML to setup radio buttons
// 0.04 - 14/12/2006 - JH - Search form state maintained in cookie. Reset function added.
// 0.05 - 25/01/2007 - JH - Muchos new stuff in anticipation of date searching
// 0.06 - 19/12/2007 - JH - Multiple indexes specified in fieldidx
// 0.07 - 26/09/2008 - JH - Bug fixed in createClause (title index not being assigned correct relations) ln 126
// 0.08 - 17/02/2009 - JH - Functions re-orders so not referenced before declared
*/

var indexList = new Array('cql.anywhere||dc.description||dc.title|||Keywords', 'dc.title|||Titles', 'dc.date|||Dates', 'dc.creator|||Creators', 'dc.identifier|||Ref. Number', 'dc.subject|||Subjects', 'bath.name|||Names', 'bath.personalName|||&nbsp;&nbsp;Personal Names', 'bath.corporateName|||&nbsp;&nbsp;Corporate Names', 'bath.geographicName|||&nbsp;&nbsp;Geographical Names', 'bath.genreForm|||Genre');
var kwRelationList = new Array('all/relevant/proxinfo|||All', 'any/relevant/proxinfo|||Any');
var exactRelationList = new Array('exact/relevant/proxinfo|||Exactly');
var proxRelationList = new Array('=/relevant/proxinfo|||Phrase');
var dateRelationList = new Array('%3C|||Before', '%3E|||After', 'within/relevant/proxinfo|||Between', 'encloses/relevant/proxinfo|||Spans...');

//var relSelectPhraseElement = document.createElement('option');
//relSelectPhraseElement.value = '=/relevant/proxinfo';
//relSelectPhraseElement.appendChild(document.createTextNode('Phrase'));


function updateSelects(current){
	var idxSelect = document.getElementById('fieldidx' + current)
	var relSelect = document.getElementById('fieldrel' + current)
	if  (!idxSelect || !relSelect || !idxSelect.options || !relSelect.options) {
		return
	}
	relSelect.options[relSelect.selectedIndex].selected = false;
	var iSelIdx = idxSelect.selectedIndex;
	if(idxSelect.options[iSelIdx].value == 'dc.identifier'){
		var rSelIdx = 2;
	} else {
		var rSelIdx = 0;
	}
	// complex conditional to decide available relations
	var relationList = new Array()
	if (iSelIdx != 2) { var relationList = kwRelationList; }
	if (iSelIdx > 0) { var relationList = relationList.concat(exactRelationList); }
	if (iSelIdx < 2) { var relationList = relationList.concat(proxRelationList); }
	if (iSelIdx == 2) {
		var rSelIdx = 4;
		var relationList = relationList.concat(dateRelationList); 
	}
	// now replace existing relation select element
	relSelect.parentNode.insertBefore(createSelect('fieldrel' + current, relationList, rSelIdx), relSelect);
	relSelect.parentNode.removeChild(relSelect);

}

function addSearchClause(current, boolIdx, clauseState){
  if ( !document.getElementById || !document.createElement ) {
 	return
  }
  //var form = document.getElementsByName('searchform')[0]
  var insertHere = document.getElementById('addClauseP');
  if (current > 0) {
	  newBool = createBoolean(current, boolIdx)
	  insertHere.parentNode.insertBefore(newBool, insertHere);
	  //form.insertBefore(boolOp, form.childNodes[insertBeforePosn])
  }
  current++
  newClause = createClause(current, clauseState)
  insertHere.parentNode.insertBefore(newClause, insertHere);
  //form.insertBefore(clause, form.childNodes[insertBeforePosn+1])
  document.getElementById('addClauseLink').href = 'javascript:addSearchClause(' + current + ');';
}

function createBoolean(current, selIdx){
	/* radio buttons cannot be created by DOM for IE - use innerHTML instead */
	if (!selIdx) {var selIdx = 0;}
	var pElem = document.createElement('p');
	pElem.setAttribute('id', 'boolOp' + current);
	pElem.setAttribute('class', 'boolOp');
	var boolList = new Array('and/relevant/proxinfo', 'or/relevant/proxinfo', 'not');
	var inputs = new Array();
	for (var i=0;i<boolList.length;i++) {
		var val = new String(boolList[i]);
		if (val.indexOf('/') > 0) {
			var shortName = val.substring(0, val.indexOf('/'));
		} else {
			var shortName = val;
		}
		inputs[i] = '<input type="radio" name="fieldbool' + current + '" value="' + val + '" id="fieldbool' + current + '-' + shortName + '"';
		if (i == selIdx) {
			inputs[i] += ' checked="checked"'
		}
		inputs[i] += '/><label for="fieldbool' + current + '-' + shortName + '">' + shortName.toUpperCase() + '&nbsp;&nbsp;</label>';
	}
  	pElem.innerHTML = inputs.join('\n');
	return pElem
}

function createSelect(name, optionList, selIdx){
	// set 1st option as selected by default
	if (!selIdx) {var selIdx = 0;}
	var selectElem = document.createElement('select')
	selectElem.id = name;
  	selectElem.name = name;
	for (var i=0; i < optionList.length; i++){
		var optionData = optionList[i].split('|||')
		var optionElem = document.createElement('option')
		optionElem.value = optionData[0];
		optionElem.innerHTML = optionData[1];
		
		if (i == selIdx) {optionElem.selected = 'selected'}
		selectElem.appendChild(optionElem)
	}
	return selectElem
}

function createClause(current, clauseState){
	if (!clauseState) {var clauseState = '0,0,';}
	var parts = clauseState.split(',');
	var pElem = document.createElement('p')
	pElem.setAttribute('id', 'searchClause' + current);
	pElem.setAttribute('class', 'searchClause')
	// index select
	var iSelIdx = parts.shift();
	var idxSelect = createSelect('fieldidx' + current, indexList, iSelIdx)
	idxSelect.onchange = new Function('updateSelects(' + current + ');')
	pElem.appendChild(idxSelect)
	pElem.appendChild(document.createTextNode(' for '))
	// relation select
	var rSelIdx = parts.shift();
	// complex conditional to decide available relations
	var relationList = new Array()
	if (iSelIdx != 2) { var relationList = kwRelationList; }
	if (iSelIdx > 0) { var relationList = relationList.concat(exactRelationList); }
	if (iSelIdx < 2) { var relationList = relationList.concat(proxRelationList); }
	if (iSelIdx == 2) {
		var relationList = relationList.concat(dateRelationList); 
	}
	pElem.appendChild(createSelect('fieldrel' + current, relationList, rSelIdx));
	// text input
	var inputElem = document.createElement('input');
	inputElem.name = 'fieldcont' + current;
	inputElem.id = 'fieldcont' + current;
	inputElem.type = 'text';
	inputElem.size = 45;
	// last entered value
	inputElem.value = parts.join(',');
	pElem.appendChild(inputElem);
	return pElem;
}

function removeClause(current) {
	var pElem = document.getElementById('boolOp' + (current-1));
	if (pElem) {
		pElem.parentNode.removeChild(pElem);
	}
	var pElem = document.getElementById('searchClause' + current);
	pElem.parentNode.removeChild(pElem);
	document.getElementById('addClauseLink').href = 'javascript:addSearchClause(' + current + ');';
}

function resetForm(formid) {
	if (typeof formid == "undefined") {
    		formid = "searchform";
  	}
	var i = 1;
	while (document.getElementById('searchClause' + i)) {
		removeClause(i);
		i++;
	}
	addSearchClause(0);
	document.getElementById('addClauseLink').href = 'javascript:addSearchClause(1);';
	setCookie(formid, '');
}

function formToString(form) {
	var i = 0;
	var fields = new Array();
	var bools = new Array();
	while (document.getElementById('fieldcont' + (i+1)) && document.getElementById('fieldcont' + (i+1)).value != "") {
		bools[i] = 0;
		if (i > 0) {
			var boolgrp = document.getElementsByName('fieldbool' + i);
			//while (!boolgrp[0].value) {boolgrp = boolgrp.slice(1);}
			for (var j=0;j<boolgrp.length;j++) {
				if (boolgrp[j].checked == true) {
					bools[i] = j;
				}
			}
		}
		i++;
		var idx = document.getElementById('fieldidx' + i).selectedIndex;
		var rel = document.getElementById('fieldrel' + i).selectedIndex;
		var cont = document.getElementById('fieldcont' + i).value;
		fields[i-1] = new Array(idx, rel, cont).join();
	} 
	stateString = fields.join('||') + '<CLAUSES|BOOLS>' + bools.join('||');
	return stateString;
}

function formFromString(s) {
	if (s && s.length > 0) {
		var parts = s.split('<CLAUSES|BOOLS>');
	} else {
		var parts = new Array()
	}
	if (parts.length == 2) {
		var clauseList = parts[0].split('||');
		var boolList = parts[1].split('||');
		for (var i=0;i<clauseList.length;i++) {
			addSearchClause(i, boolList[i], clauseList[i]);
		}
	} else {
		// no state - initialise empty search form
		addSearchClause(0);
	}

	return;
}