$(document).ready(function() {
	
	function clkNow() {
		return (window.TKLMClock && window.TKLMClock.now) ? window.TKLMClock.now() : new Date();
	}

	var weekMap = {Sun:0, Mon:1, Tue:2, Wed:3, Thu:4, Fri:5, Sat:6};
	var week = [
		'星期日',
		'星期一',
		'星期二',
		'星期三',
		'星期四',
		'星期五',
		'星期六',
	];

	
	var ianaEl = document.getElementById('countryiana');
	var iana = ianaEl ? (ianaEl.innerHTML || '').trim() : '';
	var timeEl = document.getElementById('countrytime');
	var fallbackOffset = timeEl ? (parseFloat(timeEl.innerHTML) || 0) : 0;

	var fmt = null;
	if (iana && iana !== '0' && typeof Intl !== 'undefined' && Intl.DateTimeFormat) {
		try {
			fmt = new Intl.DateTimeFormat('en-US', {
				timeZone: iana,
				hour12: false,
				year: 'numeric',
				month: '2-digit',
				day: '2-digit',
				hour: '2-digit',
				minute: '2-digit',
				second: '2-digit',
				weekday: 'short'
			});
			fmt.format(clkNow()); 
		} catch (e) {
			fmt = null;
		}
	}

	
	function readParts(now) {
		if (fmt) {
			var p = {};
			var parts = fmt.formatToParts(now);
			for (var i = 0; i < parts.length; i++) {
				if (parts[i].type !== 'literal') p[parts[i].type] = parts[i].value;
			}
			var h = parseInt(p.hour, 10);
			if (h === 24) h = 0; 
			var w = weekMap[p.weekday];
			return {
				Y: parseInt(p.year, 10),
				M: parseInt(p.month, 10),
				D: parseInt(p.day, 10),
				h: h,
				m: parseInt(p.minute, 10),
				s: parseInt(p.second, 10),
				w: (w === undefined ? 0 : w)
			};
		}
		
		var t = new Date(now.getTime() + fallbackOffset * 3600000);
		return {
			Y: t.getUTCFullYear(),
			M: t.getUTCMonth() + 1,
			D: t.getUTCDate(),
			h: t.getUTCHours(),
			m: t.getUTCMinutes(),
			s: t.getUTCSeconds(),
			w: t.getUTCDay()
		};
	}

	function IfZero(num) {
		return ((num <= 9) ? ("0" + num) : num);
	}
	function check24(hour) {
		return (hour >= 24) ? hour - 24 : hour;
	}


	
	function tzOffsetHours(zone, when) {
		try {
			var f = new Intl.DateTimeFormat('en-US', {
				timeZone: zone, hour12: false,
				year: 'numeric', month: '2-digit', day: '2-digit',
				hour: '2-digit', minute: '2-digit', second: '2-digit'
			});
			var p = {};
			var arr = f.formatToParts(when);
			for (var i = 0; i < arr.length; i++) {
				if (arr[i].type !== 'literal') { p[arr[i].type] = arr[i].value; }
			}
			var asUTC = Date.UTC(+p.year, (+p.month) - 1, +p.day,
			                     (+p.hour) % 24, +p.minute, +p.second);
			return (asUTC - when.getTime()) / 3600000;
		} catch (e) {
			return null;
		}
	}

	
	function fmtDiff(h) {
		var sign = h > 0 ? '早+' : (h < 0 ? '晚' : '');
		var a = Math.abs(h);
		var hh = Math.floor(a);
		var mm = Math.round((a - hh) * 60);
		if (mm === 60) { hh += 1; mm = 0; }
		var tail = (mm === 0) ? (hh + ':00') : (hh + ':' + (mm < 10 ? '0' + mm : mm));
		if (h === 0) { return '一致'; }
		return sign + (h < 0 ? '-' : '') + tail + '小时';
	}

	
	function syncDiff() {
		var el = document.getElementById('realtime_diff');
		if (!el || !iana || typeof Intl === 'undefined') { return; }
		var now = clkNow();
		var local = tzOffsetHours(iana, now);   
		var bj = tzOffsetHours('Asia/Shanghai', now); 
		if (local === null || bj === null) { return; }
		var txt = fmtDiff(local - bj);
		
		if (txt === '相同' || txt === '没有时差' || txt === '无时差' || txt === '与北京时间一致') { txt = '一致'; }
		if (txt) { el.textContent = txt; }

		
		try {
			var hostEl = el.parentNode;
			if (hostEl) {
				var fullTxt = hostEl.textContent || '';
				var selfCmp = '北京时间比北京时间：';
				if (fullTxt.indexOf(selfCmp) >= 0) {
					var LP2 = String.fromCharCode(40);
					var RP2 = String.fromCharCode(41);
					hostEl.textContent = fullTxt.replace(selfCmp + txt, '北京时间即中国标准时间' + LP2 + 'CST' + RP2 + '，全国统一使用');
				}
			}
		} catch (e) {}
	}


	
	function zoneName(h) {
		if (Math.abs(h) < 0.001) { return '零时区'; }
		var CN = ['零','一','二','三','四','五','六','七','八','九'];
		var sign = h > 0 ? '东' : '西';
		var a = Math.abs(h);
		var hh = Math.floor(a);
		var mm = Math.round((a - hh) * 60);
		if (mm === 60) { hh += 1; mm = 0; }
		var tail = (mm === 0) ? '区' : ((mm === 30) ? '半区' : ((mm === 45) ? '三刻区' : '区'));
		var num;
		if (hh < 10) { num = CN[hh]; }
		else if (hh === 10) { num = '十'; }
		else { num = '十' + CN[hh - 10]; }
		return sign + num + tail;
	}

	function fmtOff(h) {
		var sg = h >= 0 ? '+' : '-';
		var a = Math.abs(h);
		return sg + a.toFixed(2);
	}

	
	function syncOffset() {
		if (!iana || typeof Intl === 'undefined') { return; }
		var now = clkNow();
		var local = tzOffsetHours(iana, now);
		if (local === null) { return; }
		var txtOff = fmtOff(local);
		var txtZone = zoneName(local);
		var i, els;
		els = document.getElementsByClassName('rt-offset');
		for (i = 0; i < els.length; i++) { els[i].textContent = txtOff; }
		els = document.getElementsByClassName('rt-zone');
		for (i = 0; i < els.length; i++) { els[i].textContent = txtZone; }

		
		var LPAREN = String.fromCharCode(40); 
		var RPAREN = String.fromCharCode(41); 
		els = document.getElementsByClassName('rt-zone-full');
		for (i = 0; i < els.length; i++) {
			els[i].textContent = LPAREN + txtZone + RPAREN;
		}
	}

	
	function setTime(sel, txt, iso) {
		var el = $(sel);
		if (el.length === 0) { return; }
		el.text(txt);
		if (iso) { el.attr('datetime', iso); }
	}

	function isoOf(p, offH) {
		var sg = offH >= 0 ? '+' : '-';
		var a = Math.abs(offH);
		var hh = Math.floor(a);
		var mm = Math.round((a - hh) * 60);
		if (mm === 60) { hh += 1; mm = 0; }
		return p.Y + '-' + IfZero(p.M) + '-' + IfZero(p.D) + 'T'
		     + IfZero(p.h) + ':' + IfZero(p.m) + ':' + IfZero(p.s)
		     + sg + IfZero(hh) + ':' + IfZero(mm);
	}

	function tick() {
		var now = clkNow();
		
		var utc = now.getTime();

		var g = new Date(utc);
		var b = new Date(utc + 8 * 3600000); 
		var l = readParts(now);
		var off = (iana && typeof Intl !== 'undefined') ? tzOffsetHours(iana, now) : fallbackOffset;
		if (off === null) { off = fallbackOffset; }

		$('#getgmt').text('当前世界时间(GMT):' + g.getUTCFullYear() + '-' + (g.getUTCMonth() + 1) + '-' + g.getUTCDate() + ' ' + IfZero(g.getUTCHours()) + ':' + IfZero(g.getUTCMinutes()) + ':' + IfZero(g.getUTCSeconds()) + '');
		$('#getbj').text('当前北京时间:' + b.getUTCFullYear() + '-' + (b.getUTCMonth() + 1) + '-' + b.getUTCDate() + ' ' + IfZero(check24(b.getUTCHours())) + ':' + IfZero(b.getUTCMinutes()) + ':' + IfZero(b.getUTCSeconds()) + '');
		setTime('#localtime', IfZero(check24(l.h)) + ':' + IfZero(l.m) + ':' + IfZero(l.s), isoOf(l, off));
		setTime('#gettime_gmt', IfZero(g.getUTCHours()) + ':' + IfZero(g.getUTCMinutes()) + ':' + IfZero(g.getUTCSeconds()), isoOf(l, 0));
		setTime('#localdate', l.Y + '年' + IfZero(l.M) + '月' + IfZero(l.D) + '日 ' + week[l.w], isoOf(l, off));
	}

	tick();
	syncDiff();
	syncOffset();
	setInterval(tick, 1000);
	setInterval(syncDiff, 60000);  
	setInterval(syncOffset, 60000); 

	
	if (window.TKLMClock && window.TKLMClock.onSync) {
		window.TKLMClock.onSync(function () { tick(); syncDiff(); syncOffset(); });
	}
});