<%#

LuCI LXC module

Copyright (C) 2014, Cisco Systems, Inc.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

	http://www.apache.org/licenses/LICENSE-2.0

Author: Petar Koretic <petar.koretic@sartura.hr>

-%>

<%-
local nx     = require "nixio"
local target = nx.uname().machine
-%>

<div class="cbi-section">
	<h3><%:Available Containers%></h3>
	<div class="cbi-section-node">
		<div class="table cbi-section-table" id="t_lxc_list">
			<div class="tr cbi-section-table-titles">
				<div class="th cbi-section-table-cell"><%:Name%></div>
				<div class="th cbi-section-table-cell"><%:Status%></div>
				<div class="th cbi-section-table-cell"><%:Actions%></div>
			</div>
		</div>
	</div>
</div>

<div class="cbi-section">
	<span id="lxc-list-output"></span>
</div>

<hr />
<div class="cbi-section">
	<h3><%:Create New Container%></h3>
	<div class="cbi-section-node">
		<div class="table cbi-section-table" id="t_lxc_create">
			<div class="tr cbi-section-table-titles">
				<div class="th cbi-section-table-cell"><%:Name%></div>
				<div class="th cbi-section-table-cell"><%:Template%></div>
				<div class="th cbi-section-table-cell"><%:Actions%></div>
			</div>
			<div class="tr cbi-section-table-row" id="div_create">
				<div class="td"><input class="cbi-input-text" type="text" id="tx_name" placeholder="<%:Enter new name%>" value='' /></div>
				<div class="td"><select id="s_template" class="cbi-input-select cbi-button"></select></div>
				<div class="td">
					<input type="button" id="bt_create" value="<%:Create%>" onclick="lxc_create()" class="cbi-button cbi-button-add" />
					<span id="lxc-add-loader" style="display:inline-block; width:16px; height:16px; margin:0 5px"></span>
				</div>
			</div>
		</div>
	</div>
</div>

<div class="cbi-section">
	<span id="lxc-add-output"></span>
</div>

<hr />

<script type="text/javascript">
//<![CDATA[
	window.img    = { "red" : "<%=resource%>/cbi/red.gif", "green" : "<%=resource%>/cbi/green.gif", "purple" : "<%=resource%>/cbi/purple.gif" };
	window.states = { "STOPPED" : "red", "RUNNING" : "green", "FROZEN" : "purple" };

	var t_lxc_list  = document.getElementById('t_lxc_list');
	var loader_html = '<img src="<%=resource%>/icons/loading.gif" alt="<%:Loading%>" width="16" height="16" style="vertical-align:middle" />';
	var output_list = document.getElementById("lxc-list-output");
	var output_add  = document.getElementById("lxc-add-output");
	var loader_add  = document.getElementById("lxc-add-loader");
	var div_create  = document.getElementById("div_create");
	var bt_create   = div_create.querySelector("#bt_create");

	bt_create.disabled = true;
	info_message(output_add, "Template download in progress, please be patient!");

	function lxc_create()
	{
		var lxc_name     = div_create.querySelector("#tx_name").value.replace(/[\s!@#$%^&*()+=\[\]{};':"\\|,<>\/?]/g,'');
		var lxc_template = div_create.querySelector("#s_template").value;

		if (t_lxc_list.querySelector("[data-id='" + lxc_name + "']") != null)
		{
			return info_message(output_add, "Container with that name already exists!", 2000);
		}

		bt_create.disabled = true;
		output_add.innerHTML = '';

		if (!lxc_template)
		{
			return set_no_template();
		}

		if (!lxc_name || !lxc_name.length)
		{
			bt_create.disabled = false;
			return info_message(output_add, "The 'Name' field must not be empty!", 2000);
		}

		loading(loader_add);

		new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_create/' + '%h/%h'.format(lxc_name, lxc_template) , null,
		function(x)
		{
			bt_create.disabled = false;
			loading(loader_add, 0);

			if (!x)
			{
				info_message(output_add, "Container creation failed!", 2000);
			}
		})
	}

	function lxc_create_template(lxc_name, lxc_state)
	{
		if (document.getElementById(lxc_name))
		{
			return;
		}

		info_message(output_list, "");
		var actions = '';
		actions += '<input type="button" onclick="action_handler(this)" data-action="start" value="<%:Start%>" class="cbi-button cbi-button-apply" />';
		actions += '&#160;<input type="button" onclick="action_handler(this)" data-action="stop" value="<%:Stop%>" class="cbi-button cbi-button-reset" />';
		actions += '&#160;<input type="button" onclick="action_handler(this)" data-action="destroy" value="<%:Delete%>" class="cbi-button cbi-button-remove" />';
		actions += '&#160;<select class="cbi-input-select cbi-button" style="width:10em" onchange="action_more_handler(this)">\
						<option selected="selected" disabled="disabled">more</option>\
						<option>configure</option>\
						<option>freeze</option>\
						<option>unfreeze</option>\
						<option>reboot</option>\
					</select>';
		actions += '<span data-loader="" style="display:inline-block; width:16px; height:16px; margin:0 5px"></span>';

		var div0 = document.createElement("div");
		div0.className = "tr cbi-section-table-row";
		div0.id = lxc_name;
		div0.setAttribute("data-id", lxc_name);

		var div1 = document.createElement("div");
		div1.className = "td";
		div1.style.width = "30%";
		div1.innerHTML = '%q%h%q'.format("<strong>", lxc_name, "</strong>");

		var div2 = document.createElement("div");
		div2.className = "td";
		div2.style.width = "20%";
		div2.innerHTML = "<img src='"+window.img[lxc_state]+"'/>";

		var div3 = document.createElement("div");
		div3.className = "td";
		div3.style.width = "50%";
		div3.innerHTML = actions;

		document.getElementById("t_lxc_list").appendChild(div0);
		div0.appendChild(div1);
		div0.appendChild(div2);
		div0.appendChild(div3);
	}

	function action_handler(self)
	{
		var bt_action  = self;
		var action     = self.dataset['action'];
		var lxc_name   = self.parentNode.parentNode.dataset['id'];
		var status_img = self.parentNode.parentNode.querySelector('img');
		var loader     = self.parentNode.querySelector('[data-loader]');

		bt_action.disabled = true;

		if (action == "stop")
		{
			loading(loader);

			new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(action, lxc_name), null,
			function(x, ec)
			{
				loading(loader, 0);
				bt_action.disabled = false;

				if (!x || ec)
				{
					return info_message(output_list,"Action failed!", 2000);
				}
				set_status(status_img, "red");
			});
		}
		else if (action == "start")
		{
			loading(loader);

			new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(action, lxc_name), null,
			function(x, data)
			{
				loading(loader, 0);
				bt_action.disabled = false;

				if (!x || data)
				{
					return info_message(output_list,"Action failed!", 2000);
				}
				set_status(status_img, "green");
			});
		}
		else if (action == "destroy")
		{
			var div = self.parentNode.parentNode;
			var img = div.querySelector('img');

			if (img.getAttribute('src') != window.img["red"])
			{
				bt_action.disabled = false;
				return info_message(output_list,"Container is still running!", 2000);
			}

			if (!confirm("This will completely remove a stopped LXC container from disk. Are you sure?"))
			{
				bt_action.disabled = false;
				return;
			}
			loading(loader);

			new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(action, lxc_name), null,
			function(x, ec)
			{
				loading(loader, 0);
				bt_action.disabled = false;

				if (!x || ec)
				{
					return info_message(output_list,"Action failed!", 2000);
				}
				var div = self.parentNode.parentNode;
				div.parentNode.removeChild(div);
			});
		}
	}

	function lxc_configure_handler(self)
	{
		var div      = self.parentNode;
		var textarea = div.querySelector('[data-id]');
		var lxc_name = textarea.dataset['id'];
		var lxc_conf = textarea.value;

	new XHR().post('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_configuration_set/' + lxc_name, "lxc_conf=" + encodeURIComponent(lxc_conf),
		function(x)
		{
			if (!x || x.responseText != "0")
			{
				return info_message(output_list,"Action failed!", 2000);
			}
			info_message(output_list,"LXC configuration updated", 2000);
			var rmdiv = div.parentNode;
			rmdiv.parentNode.removeChild(rmdiv);
		})
	}

	function lxc_configure_template(lxc_name, lxc_conf)
	{
		var h = '\
			<textarea data-id="' + lxc_name + '" rows="20" style="width:600px;font-family:monospace;white-space:pre;overflow-wrap:normal;overflow-x:scroll;">'+ lxc_conf +'</textarea> \
			<input data-id="bt_confirm" onclick="lxc_configure_handler(this)" type="button" class="cbi-button" value="Confirm" />';
		return h;
	}

	function action_more_handler(self)
	{
		var lxc_name = self.parentNode.parentNode.dataset['id'];
		var loader   = self.parentNode.querySelector('[data-loader]');
		var option   = self.options[self.selectedIndex].text;
		self.value   = "more";

		switch(option)
		{
			case "configure":
				var div0 = document.createElement('div');
				var div1 = self.parentNode.parentNode;
				var next_div = div1.nextSibling;

				if (next_div && next_div.dataset['action'] !== null)
				{
					div1.parentNode.removeChild(next_div);
				}

				new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_configuration_get/' + lxc_name, null,
				function(x)
				{
					div0.innerHTML="<div>" + lxc_configure_template(lxc_name, x.responseText) + "</div>";
					div0.setAttribute('data-action','');
					div1.parentNode.insertBefore(div0, div1.nextSibling);
				})
			break;

			case "freeze":
				var img = self.parentNode.parentNode.querySelector('img');
				if(img.getAttribute('src') != window.img["green"])
				{
					return info_message(output_list,"Container is not running!", 2000);
				}

				loading(loader);

				new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(option, lxc_name), null,
				function(x, ec)
				{
					loading(loader, 0)
					if (!x || ec)
					{
						return info_message(output_list,"Action failed!", 2000);
					}
					set_status(img, "purple");
				})
			break;

			case "unfreeze":
				var img = self.parentNode.parentNode.querySelector('img');
				if(img.getAttribute('src') != window.img["purple"])
				{
					return info_message(output_list,"Container is not frozen!", 2000);
				}

				loading(loader);

				new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(option, lxc_name), null,
				function(x, ec)
				{
					loading(loader, 0);
					if (!x || ec)
					{
						return info_message(output_list,"Action failed!", 2000);
					}
					set_status(img, "green");
				})
			break;

			case "reboot":
				var img = self.parentNode.parentNode.querySelector('img');
				if(img.getAttribute('src') != window.img["green"])
				{
					return info_message(output_list,"Container is not running!", 2000);
				}

				if (!confirm("Are you sure?"))
				{
					return;
				}

				loading(loader);

				new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/' + '%h/%h'.format(option, lxc_name), null,
				function(x, ec)
				{
					loading(loader, 0)
					if (!x || ec)
					{
						return info_message(output_list,"Action failed!", 2000);
					}
					info_message(output_list,"LXC container rebooted", 2000);
				})
			break;
		}
	}

	function set_no_container()
	{
		info_message(output_list, "There are no containers available yet.");
	}

	function set_no_template()
	{
		bt_create.disabled = true;
		info_message(output_add, "There are no templates for your architecture (<%=target%>) available, please select another containers URL.");
	}

	function lxc_list_update()
	{
		XHR.poll(4, '<%=luci.dispatcher.build_url("admin", "services")%>/lxc_action/list', null,
		function(x, data)
		{
			if (!x || !data)
			{
				return;
			}

			var lxc_count = Object.keys(data).length;
			if (!lxc_count)
			{
				return set_no_container();
			}

			var lxcs = t_lxc_list.querySelectorAll('td[data-id]');
			var lxc_name_div = {};
			for (var i = 0, len = lxcs.length; i < len; i++)
			{
				var lxc_name = lxcs[i].dataset['id'];
				if (!(lxc_name in data))
				{
					var div = t_lxc_list.querySelector("[data-id='" + lxc_name + "']").parentNode;
					div.parentNode.removeChild(div);
					continue;
				}
				lxc_name_div[lxc_name] = lxcs[i].parentNode.querySelector('img');
			}

			for(var key in data)
			{
				var lxc_name = key;
				var state = window.states[data[key]];

				if (!(lxc_name in lxc_name_div))
				{
					lxc_create_template(lxc_name, state);
				}
				else if (state != get_status(lxc_name_div[lxc_name]))
				{
					set_status(lxc_name_div[lxc_name], state);
				}
			}
		})
	}

	function loading(elem, state)
	{
		state = (typeof state === 'undefined') ? 1 : state;
		if (state === 1)
		{
			elem.innerHTML = loader_html;
		}
		else
		{
			setTimeout(function() { elem.innerHTML = ''}, 2000);
		}
	}

	function set_status(elem, state)
	{
		state = (typeof state === 'undefined') ? 1 : state;
		setTimeout(function() { elem.setAttribute('src', window.img[state])}, 300);
	}

	function get_status(elem)
	{
		var src = elem.getAttribute('src');
		for (var i in img)
		{
			if (img[i] == src)
			{
				return i;
			}
		}
	}

	function info_message(output, msg, timeout)
	{
		timeout = timeout || 0;
		output.innerHTML = '<em>' + msg + '</em>';
		if (timeout > 0)
		{
			setTimeout(function(){ output.innerHTML=""}, timeout);
		}
	}

	new XHR().get('<%=luci.dispatcher.build_url("admin", "services")%>/lxc_get_downloadable', null,
	function(x, data)
	{
		if (!x)
		{
			return;
		}

		if (!data)
		{
			return set_no_template();
		}

		var lxc_count = Object.keys(data).length;
		if (!lxc_count)
		{
			return set_no_template();
		}

		var select = document.getElementById("s_template");
		for(var key in data)
		{
			var option = document.createElement('option');
			option.value = data[key];
			option.text = data[key].replace(/[_:]/g, ' ');
			select.add(option, -1);
		}

		info_message(output_add, "");
		bt_create.disabled = false;
	})

	lxc_list_update();
//]]>
</script>
