var yafEditor = function (name) {
    this.Name = name;
};
yafEditor.prototype.FormatText = function (command, option) {
    var textObj = document.getElementById(this.Name);
    switch (command) {
        case "bold":
            wrapSelection(textObj, "[b]", "[/b]");
            break;
        case "italic":
            wrapSelection(textObj, "[i]", "[/i]");
            break;
        case "underline":
            wrapSelection(textObj, "[u]", "[/u]");
            break;
        case "code":
            wrapSelection(textObj, "[code]", "[/code]");
            break;
        case "img":
            wrapSelection(textObj, "[img]", "[/img]");
            break;
        case "quote":
            wrapSelection(textObj, "[quote]", "[/quote]");
            break;
        case "justifyleft":
            wrapSelection(textObj, "[left]", "[/left]");
            break;
        case "justifycenter":
            wrapSelection(textObj, "[center]", "[/center]");
            break;
        case "justifyright":
            wrapSelection(textObj, "[right]", "[/right]");
            break;
        case "createlink":
            var url = prompt('Enter URL:', 'http://');
            if (url != '' && url != null) {
                if (getSelection(textObj)) {
                    wrapSelection(textObj, '[url=' + url + ']', '[/url]');
                } else {
                    // ask for the description text...
                    var desc = prompt('Enter URL Description:', '');
                    if (desc != '' && desc != null)
                        replaceSelection(textObj, '[url=' + url + ']' + desc + '[/url]');
                    else
                        replaceSelection(textObj, '[url]' + url + '[/url]');
                }
            }
            break;
        case "color":
            wrapSelection(textObj, "[color=" + option + "]", "[/color]");
            break;
        case "fontsize":
            wrapSelection(textObj, "[size=" + option + "]", "[/size]");
            break;
        default:
            alert("Unknown in FormatText " + command);
            break;
    }
};
yafEditor.prototype.AddImage = function () {
    var textObj = document.getElementById(this.Name);
    var img = prompt('Enter image URL:', 'http://');
    if (img != '' && img != null)
        replaceSelection(textObj, '[img]' + img + '[/img]');
};
yafEditor.prototype.InsertSmiley = function (code) {
    var textObj = document.getElementById(this.Name);
    replaceSelection(textObj, code);
};

function Button_Load(img) {
    img.className = "ButtonOut";
    img.onmouseover = function () { Button_Over(this); };
    img.onmouseout = function () { Button_Out(this); };
}

function Button_Over(img) {
    if (typeof (img._enabled) == "boolean" && !img._enabled)
        img.className = "ButtonOff";
    else
        img.className = "ButtonOver";
}

function Button_Out(img) {
    if (typeof (img._enabled) == "boolean" && !img._enabled)
        img.className = "ButtonOff";
    else if (typeof (img._selected) == "boolean" && img._selected)
        img.className = "ButtonChecked";
    else
        img.className = "ButtonOut";
}

function Button_SetState(doc, name, cmd) {
    var img = document.getElementById(name);
    try {
        img._selected = doc.queryCommandState(cmd);
    } catch (e) {
        img._selected = false;
    }
    img._enabled = doc.queryCommandEnabled(cmd);

    if (!img._enabled)
        img.className = "ButtonOff";
    else if (img._selected)
        img.className = "ButtonChecked";
    else
        img.className = "ButtonOut";
}

function storeCaret(input) {
    if (input.createTextRange) {
        input.caretPos = document.selection.createRange().duplicate();
    }
}

function setSelectionRange(input, selectionStart, selectionEnd) {
    if (input.setSelectionRange) {
        input.focus();
        input.setSelectionRange(selectionStart, selectionEnd);
    } else if (input.createTextRange) {
        var range = input.createTextRange();
        range.collapse(true);
        range.moveEnd('character', selectionEnd);
        range.moveStart('character', selectionStart);
        range.select();
    }
}

function setCaretToPos(input, pos) {
    setSelectionRange(input, pos, pos);
}

function replaceSelection(input, replaceString) {
    if (input.setSelectionRange) {
        var selectionStart = input.selectionStart;
        var selectionEnd = input.selectionEnd;
        var scrollTop = input.scrollTop;

        input.value = input.value.substring(0, selectionStart)
            + replaceString
                + input.value.substring(selectionEnd);

        if (selectionStart != selectionEnd) // has there been a selection
            setSelectionRange(input, selectionStart, selectionStart +
                replaceString.length);
        else // set caret
            setCaretToPos(input, selectionStart + replaceString.length);

        input.scrollTop = scrollTop;
    } else if (document.selection) {
        if (input.caretPos) {
            var caretPos = input.caretPos;
            caretPos.text = caretPos.text.charAt(caretPos.text.length - 1) == ' ' ? text + ' ' : replaceString;
            if (caretPos.text != '') {
                caretPos.moveStart('character', -replaceString.length);
                caretPos.select();
            }
        } else {
            input.value += replaceString;
        }
    } else {
        input.value += replaceString;
        input.focus();
    }
}

function wrapSelection(input, preString, postString) {
    if (input.setSelectionRange) {
        var selectionStart = input.selectionStart;
        var selectionEnd = input.selectionEnd;
        var scrollTop = input.scrollTop;

        input.value = input.value.substring(0, selectionStart)
            + preString
                + input.value.substring(selectionStart, selectionEnd)
                    + postString
                        + input.value.substring(selectionEnd);
        if (selectionStart != selectionEnd) // has there been a selection
            setSelectionRange(input, selectionStart, preString.length + postString.length + selectionEnd);
        else // set caret
            setCaretToPos(input, selectionStart + (preString + postString).length);

        input.scrollTop = scrollTop;
    } else if (document.selection) {
        var sel = document.selection.createRange().text;
        if (sel) {
            document.selection.createRange().text = preString + sel + postString;
            input.focus();
        } else {
            input.value += preString + postString;
            input.focus();
        }
    } else {
        input.value += preString + postString;
        input.focus();
    }
}

function getSelection(input) {
    if (input.setSelectionRange) {
        return input.selectionStart != input.selectionEnd;
    } else if (document.selection) {
        var range = document.selection.createRange();
        return range.parentElement() == input && range.text != '';
    } else {
        return false;
    }
}