/**
 * Copyright © Mnemosyne LLC
 *
 * This file is licensed under the GPLv2.
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 */

Transmission.fmt = (function()
{
	var speed_K = 1000;
	var speed_B_str =  'B/s';
	var speed_K_str = 'kB/s';
	var speed_M_str = 'MB/s';
	var speed_G_str = 'GB/s';
	var speed_T_str = 'TB/s';

	var size_K = 1000;
	var size_B_str =  'B';
	var size_K_str = 'kB';
	var size_M_str = 'MB';
	var size_G_str = 'GB';
	var size_T_str = 'TB';

	var mem_K = 1024;
	var mem_B_str =   'B';
	var mem_K_str = 'KiB';
	var mem_M_str = 'MiB';
	var mem_G_str = 'GiB';
	var mem_T_str = 'TiB';

	return {

		updateUnits: function(u)
		{
/*
			speed_K     = u['speed-bytes'];
			speed_K_str = u['speed-units'][0];
			speed_M_str = u['speed-units'][1];
			speed_G_str = u['speed-units'][2];
			speed_T_str = u['speed-units'][3];

			size_K     = u['size-bytes'];
			size_K_str = u['size-units'][0];
			size_M_str = u['size-units'][1];
			size_G_str = u['size-units'][2];
			size_T_str = u['size-units'][3];

			mem_K     = u['memory-bytes'];
			mem_K_str = u['memory-units'][0];
			mem_M_str = u['memory-units'][1];
			mem_G_str = u['memory-units'][2];
			mem_T_str = u['memory-units'][3];
*/
		},

		/*
		 *   Format a percentage to a string
		 */
		percentString: function(x) {
			if (x < 10.0)
				return x.toTruncFixed(2);
			else if (x < 100.0)
				return x.toTruncFixed(1);
			else
				return x.toTruncFixed(0);
		},

		/*
		 *   Format a ratio to a string
		 */
		ratioString: function(x) {
			if (x === -1)
				return "None";
			if (x === -2)
				return '&infin;';
			return this.percentString(x);
		},

		/**
		 * Formats the a memory size into a human-readable string
		 * @param {Number} bytes the filesize in bytes
		 * @return {String} human-readable string
		 */
		mem: function(bytes)
		{
			if (bytes < mem_K)
				return [ bytes, mem_B_str ].join(' ');

			var convertedSize;
			var unit;

			if (bytes < Math.pow(mem_K, 2))
			{
				convertedSize = bytes / mem_K;
				unit = mem_K_str;
			}
			else if (bytes < Math.pow(mem_K, 3))
			{
				convertedSize = bytes / Math.pow(mem_K, 2);
				unit = mem_M_str;
			}
			else if (bytes < Math.pow(mem_K, 4))
			{
				convertedSize = bytes / Math.pow(mem_K, 3);
				unit = mem_G_str;
			}
			else
			{
				convertedSize = bytes / Math.pow(mem_K, 4);
				unit = mem_T_str;
			}

			// try to have at least 3 digits and at least 1 decimal
			return convertedSize <= 9.995 ? [ convertedSize.toTruncFixed(2), unit ].join(' ')
			                              : [ convertedSize.toTruncFixed(1), unit ].join(' ');
		},

		/**
		 * Formats the a disk capacity or file size into a human-readable string
		 * @param {Number} bytes the filesize in bytes
		 * @return {String} human-readable string
		 */
		size: function(bytes)
		{
			if (bytes < size_K)
				return [ bytes, size_B_str ].join(' ');

			var convertedSize;
			var unit;

			if (bytes < Math.pow(size_K, 2))
			{
				convertedSize = bytes / size_K;
				unit = size_K_str;
			}
			else if (bytes < Math.pow(size_K, 3))
			{
				convertedSize = bytes / Math.pow(size_K, 2);
				unit = size_M_str;
			}
			else if (bytes < Math.pow(size_K, 4))
			{
				convertedSize = bytes / Math.pow(size_K, 3);
				unit = size_G_str;
			}
			else
			{
				convertedSize = bytes / Math.pow(size_K, 4);
				unit = size_T_str;
			}

			// try to have at least 3 digits and at least 1 decimal
			return convertedSize <= 9.995 ? [ convertedSize.toTruncFixed(2), unit ].join(' ')
			                              : [ convertedSize.toTruncFixed(1), unit ].join(' ');
		},

		speedBps: function(Bps)
		{
			return this.speed(this.toKBps(Bps));
		},

		toKBps: function(Bps)
		{
			return Math.floor(Bps / speed_K);
		},

		speed: function(KBps)
		{
			var speed = KBps;

			if (speed <= 999.95) // 0 KBps to 999 K
				return [ speed.toTruncFixed(0), speed_K_str ].join(' ');

			speed /= speed_K;

			if (speed <= 99.995) // 1 M to 99.99 M
				return [ speed.toTruncFixed(2), speed_M_str ].join(' ');
			if (speed <= 999.95) // 100 M to 999.9 M
				return [ speed.toTruncFixed(1), speed_M_str ].join(' ');

			// insane speeds
			speed /= speed_K;
			return [ speed.toTruncFixed(2), speed_G_str ].join(' ');
		},

		timeInterval: function(seconds)
		{
			var days    = Math.floor (seconds / 86400),
			    hours   = Math.floor ((seconds % 86400) / 3600),
			    minutes = Math.floor ((seconds % 3600) / 60),
			    seconds = Math.floor (seconds % 60),
			    d = days    + ' ' + (days    > 1 ? 'days'    : 'day'),
			    h = hours   + ' ' + (hours   > 1 ? 'hours'   : 'hour'),
			    m = minutes + ' ' + (minutes > 1 ? 'minutes' : 'minute'),
			    s = seconds + ' ' + (seconds > 1 ? 'seconds' : 'second');

			if (days) {
				if (days >= 4 || !hours)
					return d;
				return d + ', ' + h;
			}
			if (hours) {
				if (hours >= 4 || !minutes)
					return h;
				return h + ', ' + m;
			}
			if (minutes) {
				if (minutes >= 4 || !seconds)
					return m;
				return m + ', ' + s;
			}
			return s;
		},

		timestamp: function(seconds)
		{
			if (!seconds)
				return 'N/A';

			var myDate = new Date(seconds*1000);
			var now = new Date();

			var date = "";
			var time = "";

			var sameYear = now.getFullYear() === myDate.getFullYear();
			var sameMonth = now.getMonth() === myDate.getMonth();

			var dateDiff = now.getDate() - myDate.getDate();
			if (sameYear && sameMonth && Math.abs(dateDiff) <= 1){
				if (dateDiff === 0){
					date = "Today";
				}
				else if (dateDiff === 1){
					date = "Yesterday";
				}
				else{
					date = "Tomorrow";
				}
			}
			else{
				date = myDate.toDateString();
			}

			var hours = myDate.getHours();
			var period = "AM";
			if (hours > 12){
				hours = hours - 12;
				period = "PM";
			}
			if (hours === 0){
				hours = 12;
			}
			if (hours < 10){
				hours = "0" + hours;
			}
			var minutes = myDate.getMinutes();
			if (minutes < 10){
				minutes = "0" + minutes;
			}
			var seconds = myDate.getSeconds();
				if (seconds < 10){
					seconds = "0" + seconds;
			}

			time = [hours, minutes, seconds].join(':');

			return [date, time, period].join(' ');
		},

		plural: function(i, word)
		{
			return [ i.toStringWithCommas(), ' ', word, (i==1?'':'s') ].join('');
		},

		peerStatus: function( flagStr ) 
		{ 
			var formattedFlags = []; 
			for (var i=0, flag; flag=flagStr[i]; ++i)
			{
				var explanation = null;
				switch (flag)
				{
					case "O": explanation = "Optimistic unchoke"; break;
					case "D": explanation = "Downloading from this peer"; break;
					case "d": explanation = "We would download from this peer if they'd let us"; break;
					case "U": explanation = "Uploading to peer"; break;
					case "u": explanation = "We would upload to this peer if they'd ask"; break;
					case "K": explanation = "Peer has unchoked us, but we're not interested"; break;
					case "?": explanation = "We unchoked this peer, but they're not interested"; break;
					case "E": explanation = "Encrypted Connection"; break;
					case "H": explanation = "Peer was discovered through Distributed Hash Table (DHT)"; break;
					case "X": explanation = "Peer was discovered through Peer Exchange (PEX)"; break;
					case "I": explanation = "Peer is an incoming connection"; break;
					case "T": explanation = "Peer is connected via uTP"; break;
				}

				if (!explanation) { 
					formattedFlags.push(flag); 
				} else { 
					formattedFlags.push("<span title=\"" + flag + ': ' + explanation + "\">" + flag + "</span>"); 
				} 
			} 
			return formattedFlags.join(''); 
		}
	}
})();