(function () {
    String.prototype.pasteTo = function (field) {
        field.focus();
        if (document.selection) {
            var range = document.selection.createRange();
            if (range) {
                range.text = this;
            }
        } else if (field.selectionStart != undefined) {
            var scrollTop = field.scrollTop, start = field.selectionStart, end = field.selectionEnd;
            var value = field.value.substring(0, start) + this + field.value.substring(end, field.value.length);
            field.value = value;
            field.scrollTop = scrollTop;
            field.setSelectionRange(start + this.length, start + this.length);
        } else {
            field.value += this;
            field.setSelectionRange(field.value.length, field.value.length);
        }
    },

	String.prototype.translateToKA = function () {

	    /**
	    * Original idea by Irakli Nadareishvili
	    * http://www.sapikhvno.org/viewtopic.php?t=47&postdays=0&postorder=asc&start=10
	    */
	    var index, chr, text = [], symbols = "abgdevzTiklmnopJrstufqRySCcZwWxjh";

	    for (var i = 0; i < this.length; i++) {
	        chr = this.substr(i, 1);
	        if ((index = symbols.indexOf(chr)) >= 0) {
	            text.push(String.fromCharCode(index + 4304));
	        } else {
	            text.push(chr);
	        }
	    }

	    return text.join('');

	},

	GeoKBD = {

	    browser: {
	        isOpera: navigator.userAgent.toLowerCase().indexOf('opera') > -1,
	        isIe: navigator.userAgent.toLowerCase().indexOf('msie') > -1,
	        isIe6: navigator.userAgent.toLowerCase().indexOf('msie 6') > -1,
	        isIe7: navigator.userAgent.toLowerCase().indexOf('msie 7') > -1
	    },

	    event: {

	        get: function (e) {
	            return e || window.event;
	        },

	        getKeyCode: function (e) {
	            e = this.get(e);
	            return e.keyCode || e.which;
	        },

	        targetIs: function (e, tagName) {
	            e = this.get(e);
	            var t = e.target || e.srcElement;
	            return t.tagName.toLowerCase() == tagName ? t : null;
	        },

	        attach: function (obj, eventName, fnc, capture) {
	            if (obj.addEventListener) {
	                obj.addEventListener(eventName, fnc, capture);
	            } else if (obj.attachEvent) {
	                return obj.attachEvent('on' + eventName, fnc);
	            } else {
	                obj['on' + eventName] = fnc;
	            }
	        },

	        detach: function (obj, eventName, fnc, capture) {
	            if (obj.removeEventListener) {
	                obj.removeEventListener(eventName, fnc, capture);
	            } else if (obj.detachEvent) {
	                obj.detachEvent('on' + eventName, fnc);
	            } else {
	                obj['on' + eventName] = null;
	            }
	        },

	        cancel: function (e) {
	            e = this.get(e);
	            if (e.stopPropagation) {
	                e.stopPropagation();
	                e.preventDefault();
	            } else {
	                e.cancelBubble = true;
	                e.returnValue = false;
	            }
	        }

	    },

	    keyHandlers: {},

	    addKeyHandler: function (key, callback) {
	        if (typeof key == 'string') {
	            key = key.charCodeAt(0);
	        }
	        if (!this.keyHandlers[key]) {
	            this.keyHandlers[key] = [];
	        }
	        this.keyHandlers[key].push(callback);
	    },

	    handleKey: function (key) {
	        if (GeoKBD.keyHandlers[key]) {
	            var handler = null;
	            for (var i = 0; i < GeoKBD.keyHandlers[key].length; i++) {
	                handler = GeoKBD.keyHandlers[key][i];
	                if (handler.constructor && handler.constructor == Array) {
	                    handler[0][handler[1]].call(handler[0], key);
	                } else {
	                    handler(key);
	                }
	            }
	        }
	    },

	    map: function (form, fieldName, switcher) {

	        var self = this, names = [], forms = [];

	        if (form) {
	            if (form.constructor) {
	                if (form.constructor == String) {
	                    names.push(form);
	                } else if (form.constructor == Array) {
	                    names = form;
	                }
	                if (names.length) {
	                    for (var idx in names) {
	                        if (document.forms[names[idx]]) {
	                            forms.push(document.forms[names[idx]]);
	                        }
	                    }
	                }
	            } else {
	                forms.push(form);
	            }
	        } else {
	            forms = document.forms;
	        }

	        for (var idx = 0; idx < forms.length; idx++) {

	            form = forms[idx];

	            if (!form.fields || form.fields == undefined) form.fields = {};
	            if (form.ka == undefined) form.ka = form[switcher] ? form[switcher].checked : true;

	            if (fieldName) {
	                if (typeof fieldName == 'string') fieldName = [fieldName];
	                for (var i = 0; i < fieldName.length; i++) {
	                    if (form[fieldName[i]] && !form.fields[fieldName[i]]) form.fields[fieldName[i]] = fieldName[i];
	                }
	            } else {
	                var name, type;
	                for (var i = 0; i < form.elements.length; i++) {
	                    if (form.elements[i].type) {
	                        name = form.elements[i].name || form.elements[i].id;
	                        type = form.elements[i].type.toLowerCase();
	                        if (name && (type == 'text' || type == 'textarea')) {
	                            form.fields[name] = name;
	                        }
	                    }
	                }
	            }

	            switcher = switcher || 'geo';
	            form.switcher = switcher;

	            form.onkeypress = function (e) {
	                e = self.event.get(e);
	                if (e.altKey || e.ctrlKey) return;

	                if (!self.browser.isIe && !self.browser.isOpera && !e.charCode) {
	                    return;
	                }

	                var target, _switcher = switcher, keyCode = self.event.getKeyCode(e);


	                if (keyCode == 96) {
	                    return false;
	                    if (this[_switcher]) {
	                        this.ka = this[_switcher].checked = !this[_switcher].checked;
	                    } else {
	                        this.ka = !this.ka;
	                    }
	                    return false;
	                } else if (this[_switcher]) {
	                    this.ka = this[_switcher].checked;
	                }
	                if (!ka) return true;
	                if (!this.ka) return;

	                if ((target = (self.event.targetIs(e, 'textarea') || self.event.targetIs(e, 'input')))) {
	                    if (!this.fields[target.name || target.id]) return;
	                    text = String.fromCharCode(keyCode);
	                    kaText = text.translateToKA();
	                    if (kaText != text) {
	                        if (GeoKBD.browser.isIe) {
	                            e.keyCode = kaText.charCodeAt(0);
	                        } else {
	                            kaText.pasteTo(target);
	                            return false;
	                        }
	                    }
	                }
	            }

	        }

	        form = forms = names = null;

	    },

	    mapIFrame: function (iframe) {

	        var __keypress = function (e) {

	            if (e.altKey || e.ctrlKey) return;
	            var doc = (e.target || e.srcElement).ownerDocument;
	            if (doc.ka == undefined) doc.ka = true;
	            var keyCode = GeoKBD.event.getKeyCode(e);
	            var text = String.fromCharCode(keyCode);
	            var form, switcher;
	            if (parent.document.forms[doc.parentForm]) {
	                form = parent.document.forms[doc.parentForm];
	                if (form.switcher && form[form.switcher]) {
	                    switcher = form[form.switcher];
	                }
	            }

	            if (keyCode == 96) {
	                doc.ka = !doc.ka;
	                if (switcher) switcher.checked = doc.ka;
	                GeoKBD.event.cancel(e);
	            } else if (switcher) {
	                doc.ka = switcher.checked;
	            }

	            form = switcher = null;

	            if (doc.ka) {
	                var kaText = text.translateToKA();
	                if (kaText != text) {
	                    if (!GeoKBD.browser.isIe) {
	                        doc.execCommand('InsertHTML', false, kaText);
	                    } else {
	                        var range = doc.selection.createRange();
	                        range.pasteHTML(kaText);
	                    }
	                    GeoKBD.event.cancel(e);
	                }
	            }

	        }

	        var __focus = function (e) {
	            if (!GeoKBD.browser.isIe) {
	                GeoKBD.event.attach(this.document, 'keypress', __keypress, true);
	                GeoKBD.event.detach(this, 'focus', __focus, true);
	            } else {
	                GeoKBD.event.attach(this.contentWindow.document, 'keypress', __keypress, true);
	                this.onfocus = null;
	            }
	        };

	        var interval = window.setInterval(function () {
	            var el = typeof iframe == 'string' ? document.getElementById(iframe) : iframe();
	            if (el) {
	                for (var p = el.parentNode; p && p != document.body; p = p.parentNode) {
	                    if (/form/i.test(p.tagName)) {
	                        if (el.contentWindow.document) {
	                            el.contentWindow.document.parentForm = p.name || p.id;
	                        } else {
	                            el.document.parentForm = p.name || p.id;
	                        }
	                        break;
	                    }
	                }
	                if (!GeoKBD.browser.isIe) {
	                    GeoKBD.event.attach(el.contentWindow, 'focus', __focus, true);
	                } else {
	                    el.onfocus = __focus;
	                }
	                el = null;
	                window.clearInterval(interval);
	            }
	        }, 100);

	    }

	};

    window.GeoKBD = GeoKBD;

})();