/*
 * Contains Main class and supporting functions for topic ajax course layout
 *
 * $Id$
 */


//hide content body until done loading (manipulation looks ugly elsewise)
document.getElementById('content').style.display='none';

//onload object for handling scripts on page load, this insurses they run in my order
function onload_class() {
    this.scripts = new Array();
    this.debug = false;
}

onload_class.prototype.add = function(script) {
    if(this.debug)YAHOO.log("onload.add - adding "+script,"junk");
    this.scripts[this.scripts.length] = script;
}

onload_class.prototype.load = function(){
    var scriptcount = this.scripts.length;
    if(this.debug)YAHOO.log("onload.load - loading "+scriptcount+" scripts","info");
    for (i=0;i<scriptcount;i++) {
        eval(this.scripts[i]);          
    }
}

var onload = new onload_class();


//main page object
function main_class(){
    this.portal = new php_portal_class();

    this.blocks = new Array();
    this.sections = new Array();

    this.leftcolumn = null;
    this.rightcolumn = null;        
    this.adminBlock = null; 

    //if you use firefox the firebug extension will show log contents otherwise uncomment to view
    //this.logview = new YAHOO.widget.LogReader('header'); 

    this.icons = [];
    this.marker = null;

    //things to process onload
    onload.add('main.process_document();');
    onload.add("document.getElementById('content').style.display='block';");

    //connection queue allows xhttp requests to be sent in order
    this.connectQueue = [];
    this.connectQueueHead = 0;
    this.connectQueueConnection = null;

    this.debug = true;
}


main_class.prototype.process_blocks = function(){

    //remove unneeded icons (old school position icons and delete/hide although they will be readded)
    var rmIconClasses = ['icon up','icon down','icon right','icon left','icon delete','icon hide'];
    for (var c=0;c<rmIconClasses.length;c++) {
        els = YAHOO.util.Dom.getElementsByClassName(rmIconClasses[c]);

        for (var x=0;x<els.length;x++) {
            els[x].parentNode.removeChild(els[x]);
        }
    }    

    //process the block ids passed from php
    var blockcount = this.portal.blocks.length;
    YAHOO.log("main.processBlocks - processing "+blockcount+" blocks","info");
    for (i=0;i<blockcount;i++) {
        this.blocks[i] = new block_class(this.portal.blocks[i][1],"blocks");

        //put in correct side array also
        if (this.portal.blocks[i][0] == 'l') {
            main.leftcolumn.add_block(this.blocks[i]);
        } else if (this.portal.blocks[i][0] == 'r') {
            main.rightcolumn.add_block(this.blocks[i]);  
        }

        //hide if called for
        if (this.portal.blocks[i][2] == 1) {
            this.blocks[i].toggle_hide(null,null,true);                         
        }
    }     
}


main_class.prototype.process_document = function(){

    //process the document to get important containers0
    YAHOO.log("Processing Document","info");
    //process columns for blocks
    this.leftcolumn = new column_class('left-column',"blocks",null,'l');
    this.rightcolumn = new column_class('right-column',"blocks",null,'r');

    //process sections

    var ct = 0;
    while (document.getElementById('section-'+ct) != null) {
        this.sections[ct]=new section_class('section-'+ct,"sections",null,ct!=0?true:false);
        this.sections[ct].addToGroup('resources');
        ct++;
    }
    if(this.debug)YAHOO.log("Processed "+ct+" sections");       

    this.adminBlock = YAHOO.util.Dom.getElementsByClassName('block_adminblock')[0]; 
    YAHOO.log("admin - "+this.adminBlock.className);
}

main_class.prototype.mk_safe_for_transport = function(input){
    return input.replace(/&/i,'_.amp._');
} 

main_class.prototype.get_block_index = function(el){
    //return block by id
    var blockcount = this.blocks.length;
    for (i=0;i<blockcount;i++) {
        if (this.blocks[i] == el) {
            return i;
        }
    }
}

main_class.prototype.get_section_index = function(el){
    var sectioncount = this.sections.length;
    for (i=0;i<sectioncount;i++) {
        if (this.sections[i] == el) {
            return i;
        }
    }
}       

main_class.prototype.mk_button = function(tag,imgSrc,attributes,imgAttributes){
    //create button and return object   
    var container = document.createElement(tag);
    container.style.cursor = 'pointer';       
    var image = document.createElement('img');
    image.setAttribute('src',main.portal.strings['wwwroot']+imgSrc);          
    container.appendChild(image);

    if (attributes != null) {
        for (var c=0;c<attributes.length;c++) {
            container.setAttribute(attributes[c][0],attributes[c][1]);
        }
    }

    if (imgAttributes != null) {
        for (var c=0;c<attributes.length;c++) {
            image.setAttribute(imgAttributes[c][0],imgAttributes[c][1]);                
        }
    }

    return container;
}

main_class.prototype.connect = function(method,urlStub,callback,body){
    if(this.debug)YAHOO.log("Making "+method+" connection to /course/rest.php?courseId="+main.portal.id+"&"+urlStub);

    if (callback == null) {
        callback = {}
    }
    return YAHOO.util.Connect.asyncRequest(method,this.portal.strings['wwwroot']+"/course/rest.php?courseId="+main.portal.id+"&"+urlStub,callback,body);
} 

main_class.prototype.connectQueue_add = function(method,urlStub,callback,body) {
    var Qlength = main.connectQueue.length;
    main.connectQueue[Qlength] = [];
    main.connectQueue[Qlength]['method'] = method;
    main.connectQueue[Qlength]['urlStub'] = urlStub;
    main.connectQueue[Qlength]['body'] = body;

    if (main.connectQueueConnection == null || !YAHOO.util.Connect.isCallInProgress(main.connectQueueConnection)) {
        main.connectQueue_fireNext();
    }
}  

main_class.prototype.connectQueue_fireNext= function(){
    var head = main.connectQueueHead;
    if (head >= main.connectQueue.length) {
        return;
    }

    var callback = {
success: function(){
             main.connectQueue_fireNext();
         }
    }

    main.connectQueueConnection = main.connect(main.connectQueue[head]['method'],main.connectQueue[head]['urlStub'],callback,main.connectQueue[head]['body'])

    main.connectQueueHead++;
}           

main_class.prototype.update_marker = function(newMarker){
    if (this.marker != null) {
        this.marker.toggle_highlight();
    }

    this.marker = newMarker;     
    this.marker.toggle_highlight();

    this.connect('post','class=course&field=marker',null,'value='+this.marker.sectionId);
} 

main_class.prototype.getString = function(title,variable){
        if(this.portal.strings[title])
          return this.portal.strings[title].replace(/_var_/,variable);
  }

var main = new main_class();

function php_portal_class(){
    //portal to php data

    this.id = null;

    //array of id's of blocks set at end of page load by php    
    this.blocks = new Array();
    this.imagePath = null;

    //flag for week fomat
    this.isWeek = false;

    //strings    
    this.strings = [];

    YAHOO.log("instantiated php_portal_class","info");
}