var edButtons = new Array();
var edOpenTags = new Array();

function edButton(id, display, tagStart, tagEnd, access, open) {
    this.id = id;
    this.display = display;
    this.tagStart = tagStart;
    this.tagEnd = tagEnd;
    this.access = access;
    this.open = open;
}

edButtons.push(
    new edButton(
        'ed_bold'
        ,langBold
        ,'*'
        ,'*'
        ,'b'
    )
);

edButtons.push(
    new edButton(
        'ed_italic'
        ,langItalic
        ,'_'
        ,'_'
        ,'i'
    )
);

edButtons.push(
    new edButton(
        'ed_ext_link'
        ,langExternalLink
        ,''
        ,''
        ,'e'
        ,-1
    )
); // special case

edButtons.push(
    new edButton(
        'ed_ul'
        ,langUnorderedListEntry
        ,'\n* '
        ,''
        ,'u'
        ,-1
    )
);

edButtons.push(
    new edButton(
        'ed_ol'
        ,langOrderedListEntry
        ,'\n# '
        ,''
        ,'o'
        ,-1
    )
);

function edShowButton(button, i) {
    if (button.access) {
        var accesskey = ' accesskey = "' + button.access + '"'
    }
    else {
        var accesskey = '';
    }
    switch (button.id) {
        case 'ed_link':
            document.write('<a href="javascript:edInsertLink(edCanvas, ' + i + ');" title="' + button.display + '" id="' + button.id + '"><img src="/html/images/main/editor/' + button.id + '.gif" alt="' + button.display + '" ' + accesskey + ' /></a>');
            break;
        case 'ed_ext_link':
            document.write('<a href="javascript:edInsertExtLink(edCanvas, ' + i + ');" title="' + button.display + '" id="' + button.id + '"><img src="/html/images/main/editor/' + button.id + '.gif" alt="' + button.display + '" ' + accesskey + ' /></a>');
            break;
        default:
            document.write('<a href="javascript:edInsertTag(edCanvas, ' + i + ');" title="' + button.display + '" id="' + button.id + '"><img src="/html/images/main/editor/' + button.id + '.gif" alt="' + button.display + '" ' + accesskey + ' /></a>');
            break;
    }
}

function edAddTag(button) {
    if (edButtons[button].tagEnd != '') {
        edOpenTags[edOpenTags.length] = button;
        document.getElementById(edButtons[button].id).className = 'selected';
    }
}

function edRemoveTag(button) {
    for (i = 0; i < edOpenTags.length; i++) {
        if (edOpenTags[i] == button) {
            edOpenTags.splice(i, 1);
            document.getElementById(edButtons[button].id).className = '';
        }
    }
}

function edCheckOpenTags(button) {
    var tag = 0;
    for (i = 0; i < edOpenTags.length; i++) {
        if (edOpenTags[i] == button) {
            tag++;
        }
    }
    if (tag > 0) {
        return true; // tag found
    }
    else {
        return false; // tag not found
    }
}

function edCloseAllTags() {
    var count = edOpenTags.length;
    for (o = 0; o < count; o++) {
        edInsertTag(edCanvas, edOpenTags[edOpenTags.length - 1]);
    }
}

function edToolbar() {
    document.write('<div class="ed_toolbar">');
    for (i = 0; i < edButtons.length; i++) {
        edShowButton(edButtons[i], i);
    }
    document.write('<a href="javascript:edCloseAllTags();" title="' + langCloseOpenTags + '" id="ed_close"><img src="/html/images/main/editor/ed_close.gif" alt="' + langCloseOpenTags + '" /></a>');
    document.write('</div>');
}

// insertion code

function edInsertTag(myField, i) {
    //IE support
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        if (sel.text.length > 0) {
            sel.text = edButtons[i].tagStart + sel.text + edButtons[i].tagEnd;
        }
        else {
            if (!edCheckOpenTags(i) || edButtons[i].tagEnd == '') {
                sel.text = edButtons[i].tagStart;
                edAddTag(i);
            }
            else {
                sel.text = edButtons[i].tagEnd;
                edRemoveTag(i);
            }
        }
        myField.focus();
    }
    //MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == '0') {
        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        var cursorPos = endPos;
        var scrollTop = myField.scrollTop;
        if (startPos != endPos) {
            myField.value = myField.value.substring(0, startPos)
                          + edButtons[i].tagStart
                          + myField.value.substring(startPos, endPos)
                          + edButtons[i].tagEnd
                          + myField.value.substring(endPos, myField.value.length);
            cursorPos += edButtons[i].tagStart.length + edButtons[i].tagEnd.length;
        }
        else {
            if (!edCheckOpenTags(i) || edButtons[i].tagEnd == '') {
                myField.value = myField.value.substring(0, startPos)
                              + edButtons[i].tagStart
                              + myField.value.substring(endPos, myField.value.length);
                edAddTag(i);
                cursorPos = startPos + edButtons[i].tagStart.length;
            }
            else {
                myField.value = myField.value.substring(0, startPos)
                              + edButtons[i].tagEnd
                              + myField.value.substring(endPos, myField.value.length);
                edRemoveTag(i);
                cursorPos = startPos + edButtons[i].tagEnd.length;
            }
        }
        myField.focus();
        myField.selectionStart = cursorPos;
        myField.selectionEnd = cursorPos;
        myField.scrollTop = scrollTop;
    }
    else {
        if (!edCheckOpenTags(i) || edButtons[i].tagEnd == '') {
            myField.value += edButtons[i].tagStart;
            edAddTag(i);
        }
        else {
            myField.value += edButtons[i].tagEnd;
            edRemoveTag(i);
        }
        myField.focus();
    }
}

function edInsertContent(myField, myValue) {
    //IE support
    if (document.selection) {
        myField.focus();
        sel = document.selection.createRange();
        sel.text = myValue;
        myField.focus();
    }
    //MOZILLA/NETSCAPE support
    else if (myField.selectionStart || myField.selectionStart == '0') {
        var startPos = myField.selectionStart;
        var endPos = myField.selectionEnd;
        var scrollTop = myField.scrollTop;
        myField.value = myField.value.substring(0, startPos)
                      + myValue
                      + myField.value.substring(endPos, myField.value.length);
        myField.focus();
        myField.selectionStart = startPos + myValue.length;
        myField.selectionEnd = startPos + myValue.length;
        myField.scrollTop = scrollTop;
    } else {
        myField.value += myValue;
        myField.focus();
    }
}

function edInsertLink(myField) {
	var myValue = prompt(langEnterLinkName, 'Link');
	if (myValue) {
		myValue = '"'
				+ myValue
				+ '"::'
				+ prompt(langEnterURL, 'http://');
		edInsertContent(myField, myValue);
	}
}

function edInsertExtLink(myField) {
	var myValue = prompt(langEnterLinkName, 'Link');
	if (myValue) {
		myValue = '"'
				+ myValue
				+ '":'
				+ prompt(langEnterURL, 'http://');
		edInsertContent(myField, myValue);
	}
}

function countInstances(string, substr) {
    var count = string.split(substr);
    return count.length - 1;
}