/**
 * @copyFrom http://Finn-Rasmussen.com/myphp-1.10/myphp-1.10-js/html/page/DateFormat.js.php
 * Copyrigt notice: You may copy the source code as is as long as you keep the copy right notice intact
 *
 * @package   javascript
 * @author    http://Finn-Rasmussen.com
 * @copyright http://Finn-Rasmussen.com
 * @version   1.10
 * @since     22-feb-2007
 */
var DateFormat = new function() {
    this.DASH  = '-';
    this.SLASH = '/';
    this.LONG  = 'dd-mm-yyyy'; // Long  style pattern
    this.SHORT = 'ddmmyy'; // Short style pattern
    this.styleDate  = "date"; // TODO
    this.locale     = Locale.getInstance();
    
    this.getInstance = function(locale) {
        if (typeof locale !== 'undefined') {
            this.locale = locale;
        } else {
            alert(typeof locale);
        }
        return this;
    }
    
    this.getDateInstance = function(styleDate, locale) {
        this.styleDate = styleDate;
        return this.getInstance(locale);
    }
    this.format = function(strDate) {
        var pattern = this.adjust(strDate);
        var date    = this.newDate(pattern);
        var format  = this.parse(date);
        return format;
    }
    this.adjust = function(strDate) {
        var pattern = strDate;
        var today = new Date();
        if (pattern.length === 1 || pattern.length === 2) {
            // Expected strDate d(1) or dd(2)
            var date  = this.getDate(pattern);
            var now = new Date(today.getFullYear(), today.getMonth(), date);
            pattern = '' + now.getDate() + this.SLASH + (now.getMonth() + 1) + this.SLASH + now.getFullYear();
        }
        if (pattern.length === 3 || pattern.length === 4) {
            if (pattern.indexOf(this.DASH) === -1 &&  pattern.indexOf(this.SLASH) === -1) {
                // Expected strDate dmm(3) or ddmm(4)
                var pos = pattern.length===3?1:2; // 0123
                var date  = parseInt(pattern.substring(0,pos),10);
                var month = parseInt(pattern.substring(pos),10);
                var now = new Date(today.getFullYear(), month-1, date);
                pattern = '' + now.getDate() + this.SLASH + (now.getMonth() + 1) + this.SLASH + now.getFullYear();
            } else {
                // Expected strDate d-m(3), d-mm(4)
                var date  = this.getDate(pattern);
                var month = this.getMonth(pattern);
                var now = new Date(today.getFullYear(), month-1, date);
                pattern = '' + now.getDate() + this.SLASH + (now.getMonth() + 1) + this.SLASH + now.getFullYear();
            }
        }
        if (pattern.length === 5 || pattern.length === 7) {
            if (pattern.indexOf(this.DASH) === -1 &&  pattern.indexOf(this.SLASH) === -1) {
                // Expected strdate dmmyy(5), dmmyyyy(7)
                pattern = '0' + pattern;
            } else {
                // Expected strdate dd-mm(5), d-mm-yy(7), dd-m-yy(7)
                var date  = this.getDate(pattern);
                var month = this.getMonth(pattern);
                var year  = this.getYear(pattern);
                var now = new Date(year, month-1, date);
                pattern = '' + now.getDate() + this.SLASH + (now.getMonth() + 1) + this.SLASH + now.getFullYear();
            }
        }
        return pattern;
    }
    this.newDate = function(pattern) {
        var date  = this.getDate(pattern);
        var month = this.getMonth(pattern);
        var year  = this.getYear(pattern);
        return new Date(year, month-1, date);
    }
    this.getDate = function(pattern) {
        var start = this.getStart(pattern,0);
        var end   = this.getEnd(pattern,1);
        var date  = parseInt(pattern.substring(start, end),10);
        if (isNaN(date)) {
            var today = new Date();
            date = today.getDate();
        }
        return date;
    }
    this.getMonth = function(pattern) {
        var start = this.getStart(pattern,2);
        var end   = this.getEnd(pattern,3);
        var month = parseInt(pattern.substring(start, end),10);
        if (isNaN(month)) {
            var today = new Date();
            month = today.getMonth() + 1;
        }
        return month;
    }
    this.getYear = function(pattern) {
        var start = this.getStart(pattern,4);
        var end   = this.getEnd(pattern,5);
        var year  = parseInt(pattern.substring(start, end),10);
        if (isNaN(year)) {
            var today = new Date();
            year = today.getFullYear();
        }
        if (year < 100) {
            year = 2000 + year;
        }
        return year;
    }
    this.getStart = function(pattern,level) {
        var pos = this.getLevel(pattern, level);
        pos = this.split(pattern, level, this.DASH , pos);
        pos = this.split(pattern, level, this.SLASH, pos);
        return pos;
    }
    this.getEnd = function(pattern,level) {
        return this.getStart(pattern,level);
    }    
    this.split = function(pattern, level, char, pos) {
        var newPos = pos; 
        var split = pattern.split(char);
        if (split.length > 1) {
            var ps = this.getPos(split, level);
            if (ps != -1) {
                newPos = ps; // Found a match, use it
            }
        } else {
            // Ignore
        }
        return newPos;
    }
    this.getLevel = function(pattern, level) {
        var pos = -1;
        if (pattern.indexOf(this.DASH) === -1 &&  pattern.indexOf(this.SLASH) === -1) {
            pos = 0;
            switch (level) {
                case 1:
                    pos++;
                case 2: 
                    pos += level; 
                    break;
                case 3: 
                    pos++;
                case 4: 
                    pos += level; 
                    break;
                case 5: 
                    pos = pattern.length;
                    break;
            }
        }
        return pos;
    }
    this.getPos = function(split, level) {
        var pos = -1;
        if (level >= 0) {
            pos = 0;
        }
        if (level > 0 && split.length > 0) {
            pos += split[0].length;
        }
        if (level > 1 && split.length > 0) {
            pos += 1; // Dash or Slash
        }
        if (level > 2 && split.length > 1) {
            pos += split[1].length;
        }
        if (level > 3 && split.length > 1) {
            pos += 1; // Dash or Slash
        }
        if (level > 4 && split.length > 2) {
            pos += split[2].length;
        }
        if (level > 5 && split.length > 2) {
            // Ignore
        }
        return pos;
    }
    this.parse = function(date) {
        var day   = date.getDate();
        if (day < 10) {
            day = '0' + day;
        }
        var month = date.getMonth() + 1; // Zero based
        if (month < 10) {
            month = '0' + month;
        }
        var year  = date.getFullYear();
        var seperator = this.locale.getSeperator();
        // TODO this.SHORT or this.LONG
        return day + seperator + month + seperator + year;
    }
}