/*
    Masked Input plugin for jQuery
    Copyright (c) 2007-2009 Josh Bush (digitalbush.com)
    Licensed under the MIT license (http://digitalbush.com/projects/masked-input-plugin/#license)
    Version: 1.2.2 (03/09/2009 22:39:06)
*/
(function($) {
    var pasteEventName = ($.browser.msie ? 'paste' : 'input') + ".mask";
    var iPhone = (window.orientation != undefined);

    $.mask = {
        //Predefined character definitions
        definitions: {
            '9': "[0-9]",
            'a': "[A-Za-z]",
            '*': "[A-Za-z0-9]"
        }
    };

    $.fn.extend({
        //Helper Function for Caret positioning
        caret: function(begin, end) {
            if (this.length == 0) return;
            if (typeof begin == 'number') {
                end = (typeof end == 'number') ? end : begin;
                return this.each(function() {
                    if (this.setSelectionRange) {
                        this.focus();
                        this.setSelectionRange(begin, end);
                    } else if (this.createTextRange) {
                        var range = this.createTextRange();
                        range.collapse(true);
                        range.moveEnd('character', end);
                        range.moveStart('character', begin);
                        range.select();
                    }
                });
            } else {
                if (this[0].setSelectionRange) {
                    begin = this[0].selectionStart;
                    end = this[0].selectionEnd;
                } else if (document.selection && document.selection.createRange) {
                    var range = document.selection.createRange();
                    begin = 0 - range.duplicate().moveStart('character', -100000);
                    end = begin + range.text.length;
                }
                return {
                    begin: begin,
                    end: end
                };
            }
        },
        unmask: function() {
            return this.trigger("unmask");
        },
        mask: function(mask, settings) {
            if (!mask && this.length > 0) {
                var input = $(this[0]);
                var tests = input.data("tests");
                return $.map(input.data("buffer"), function(c, i) {
                    return tests[i] ? c : null;
                }).join('');
            }
            settings = $.extend({
                placeholder: "_",
                completed: null
            }, settings);

            var defs = $.mask.definitions;
            var tests = [];
            var partialPosition = mask.length;
            var firstNonMaskPos = null;
            var len = mask.length;

            $.each(mask.split(""), function(i, c) {
                if (c == '?') {
                    len--;
                    partialPosition = i;
                } else if (defs[c]) {
                    tests.push(new RegExp(defs[c]));
                    if(firstNonMaskPos==null)
                        firstNonMaskPos =  tests.length - 1;
                } else {
                    tests.push(null);
                }
            });

            return this.each(function() {
                var input = $(this);
                var buffer = $.map(mask.split(""), function(c, i) {
                    if (c != '?') return defs[c] ? settings.placeholder : c
                });
                var ignore = false;  			//Variable for ignoring control keys
                var focusText = input.val();

                input.data("buffer", buffer).data("tests", tests);

                function seekNext(pos) {
                    while (++pos <= len && !tests[pos]);
                    return pos;
                };

                function shiftL(pos) {
                    while (!tests[pos] && --pos >= 0);
                    for (var i = pos; i < len; i++) {
                        if (tests[i]) {
                            buffer[i] = settings.placeholder;
                            var j = seekNext(i);
                            if (j < len && tests[i].test(buffer[j])) {
                                buffer[i] = buffer[j];
                            } else
                                break;
                        }
                    }
                    writeBuffer();
                    input.caret(Math.max(firstNonMaskPos, pos));
                };

                function shiftR(pos) {
                    for (var i = pos, c = settings.placeholder; i < len; i++) {
                        if (tests[i]) {
                            var j = seekNext(i);
                            var t = buffer[i];
                            buffer[i] = c;
                            if (j < len && tests[j].test(t))
                                c = t;
                            else
                                break;
                        }
                    }
                };

                function keydownEvent(e) {
                    var pos = $(this).caret();
                    var k = e.keyCode;
                    ignore = (k < 16 || (k > 16 && k < 32) || (k > 32 && k < 41));

                    //delete selection before proceeding
                    if ((pos.begin - pos.end) != 0 && (!ignore || k == 8 || k == 46))
                        clearBuffer(pos.begin, pos.end);

                    //backspace, delete, and escape get special treatment
                    if (k == 8 || k == 46 || (iPhone && k == 127)) {//backspace/delete
                        shiftL(pos.begin + (k == 46 ? 0 : -1));
                        return false;
                    } else if (k == 27) {//escape
                        input.val(focusText);
                        input.caret(0, checkVal());
                        return false;
                    }
                };

                function keypressEvent(e) {
                    if (ignore) {
                        ignore = false;
                        //Fixes Mac FF bug on backspace
                        return (e.keyCode == 8) ? false : null;
                    }
                    e = e || window.event;
                    var k = e.charCode || e.keyCode || e.which;
                    var pos = $(this).caret();

                    if (e.ctrlKey || e.altKey || e.metaKey) {//Ignore
                        return true;
                    } else if ((k >= 32 && k <= 125) || k > 186) {//typeable characters
                        var p = seekNext(pos.begin - 1);
                        if (p < len) {
                            var c = String.fromCharCode(k);
                            if (tests[p].test(c)) {
                                shiftR(p);
                                buffer[p] = c;
                                writeBuffer();
                                var next = seekNext(p);
                                $(this).caret(next);
                                if (settings.completed && next == len)
                                    settings.completed.call(input);
                            }
                        }
                    }
                    return false;
                };

                function clearBuffer(start, end) {
                    for (var i = start; i < end && i < len; i++) {
                        if (tests[i])
                            buffer[i] = settings.placeholder;
                    }
                };

                function writeBuffer() {
                    return input.val(buffer.join('')).val();
                };

                function checkVal(allow) {
                    //try to place characters where they belong
                    var test = input.val();
                    var lastMatch = -1;
                    for (var i = 0, pos = 0; i < len; i++) {
                        if (tests[i]) {
                            buffer[i] = settings.placeholder;
                            while (pos++ < test.length) {
                                var c = test.charAt(pos - 1);
                                if (tests[i].test(c)) {
                                    buffer[i] = c;
                                    lastMatch = i;
                                    break;
                                }
                            }
                            if (pos > test.length)
                                break;
                        } else if (buffer[i] == test[pos] && i!=partialPosition) {
                            pos++;
                            lastMatch = i;
                        }
                    }
                    if (!allow && lastMatch + 1 < partialPosition) {
                        input.val("");
                        clearBuffer(0, len);
                    } else if (allow || lastMatch + 1 >= partialPosition) {
                        writeBuffer();
                        if (!allow) input.val(input.val().substring(0, lastMatch + 1));
                    }
                    return (partialPosition ? i : firstNonMaskPos);
                };

                if (!input.attr("readonly"))
                    input
                    .one("unmask", function() {
                        input
                        .unbind(".mask")
                        .removeData("buffer")
                        .removeData("tests");
                    })
                    .bind("focus.mask", function() {
                        focusText = input.val();
                        var pos = checkVal();
                        writeBuffer();
                        setTimeout(function() {
                            if (pos == mask.length)
                                input.caret(0, pos);
                            else
                                input.caret(pos);
                        }, 0);
                    })
                    .bind("blur.mask", function() {
                        checkVal();
                        if (input.val() != focusText)
                            input.change();
                    })
                    .bind("keydown.mask", keydownEvent)
                    .bind("keypress.mask", keypressEvent)
                    .bind(pasteEventName, function() {
                        setTimeout(function() {
                            input.caret(checkVal(true));
                        }, 0);
                    });

                checkVal(); //Perform initial check for existing values
            });
        }
    });
})(jQuery);