dojo.provide("dojox.dtl.utils.date");

dojo.require("dojox.date.php");

dojox.dtl.utils.date.DateFormat = function(/*String*/ format){
	dojox.date.php.DateFormat.call(this, format);
}
dojo.extend(dojox.dtl.utils.date.DateFormat, dojox.date.php.DateFormat.prototype, {
	f: function(){
		// summary:
		//		Time, in 12-hour hours and minutes, with minutes left off if they're zero.
		// description: 
		//		Examples: '1', '1:30', '2:05', '2'
		//		Proprietary extension.
		return (!this.date.getMinutes()) ? this.g() : this.g() + ":" + this.i();
	},
	N: function(){
		// summary: Month abbreviation in Associated Press style. Proprietary extension.
		return dojox.dtl.utils.date._months_ap[this.date.getMonth()];
	},
	P: function(){
		// summary:
		//		Time, in 12-hour hours, minutes and 'a.m.'/'p.m.', with minutes left off
		//		if they're zero and the strings 'midnight' and 'noon' if appropriate.
		// description:
		//		Examples: '1 a.m.', '1:30 p.m.', 'midnight', 'noon', '12:30 p.m.'
		//		Proprietary extension.
		if(!this.date.getMinutes() && !this.date.getHours()){
			return 'midnight';
		}
		if(!this.date.getMinutes() && this.date.getHours() == 12){
			return 'noon';
		}
		return this.f() + " " + this.a();
	}
});

dojo.mixin(dojox.dtl.utils.date, {
	format: function(/*Date*/ date, /*String*/ format){
		var df = new dojox.dtl.utils.date.DateFormat(format);
		return df.format(date);
	},
	timesince: function(d, now){
		// summary:
		//		Takes two datetime objects and returns the time between then and now
		//		as a nicely formatted string, e.g "10 minutes"
		// description:
		//		Adapted from http://blog.natbat.co.uk/archive/2003/Jun/14/time_since
		if(!(d instanceof Date)){
			d = new Date(d.year, d.month, d.day);
		}
		if(!now){
			now = new Date();
		}

		var delta = Math.abs(now.getTime() - d.getTime());
		for(var i = 0, chunk; chunk = dojox.dtl.utils.date._chunks[i]; i++){
			var count = Math.floor(delta / chunk[0]);
			if(count) break;
		}
		return count + " " + chunk[1](count);
	},
	_chunks: [
		[60 * 60 * 24 * 365 * 1000, function(n){ return (n == 1) ? 'year' : 'years'; }],
		[60 * 60 * 24 * 30 * 1000, function(n){ return (n == 1) ? 'month' : 'months'; }],
		[60 * 60 * 24 * 7 * 1000, function(n){ return (n == 1) ? 'week' : 'weeks'; }],
		[60 * 60 * 24 * 1000, function(n){ return (n == 1) ? 'day' : 'days'; }],
		[60 * 60 * 1000, function(n){ return (n == 1) ? 'hour' : 'hours'; }],
		[60 * 1000, function(n){ return (n == 1) ? 'minute' : 'minutes'; }]
	],
	_months_ap: ["Jan.", "Feb.", "March", "April", "May", "June", "July", "Aug.", "Sept.", "Oct.", "Nov.", "Dec."]
});