/*
 * This file is part of Linode Manager Classic.
 *
 * Linode Manager Classic is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Linode Manager Classic is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Linode Manager Classic.  If not, see <https://www.gnu.org/licenses/>.
 */

import { settings, elements, apiGet, apiPost, parseParams, setupHeader } from "/global.js";

(function()
{
	// Element names specific to this page
	elements.destClass = "dest-ip";
	elements.destLinode = "dest-linode";
	elements.doIt = "do-it";
	elements.info = "info";
	elements.linodeLabel = "linode-label";
	elements.linodeSelect = "linode-select";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.lmcRow = "lmc-tr3";
	elements.privateIPs = "private-ips";
	elements.publicIPs = "public-ips";
	elements.selectButton = "select-button";
	elements.srcClass = "src-ip";
	elements.srcLinode = "src-linode";
	elements.subnav = "subnav-link";
	elements.subnavActive = "subnav-link-active";

	// Data recieved from API calls
	var data = {};
	data.destNet = {};
	data.linode = {};
	data.linodes = [];
	data.srcNet = {};

	// Static references to UI elements
	var ui = {};
	ui.destLinode = {};
	ui.doIt = {};
	ui.linodeLabel = {};
	ui.linodeSelect = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.privateIPs = {};
	ui.publicIPs = {};
	ui.selectButton = {};
	ui.srcLinode = {};

	// Temporary state
	var state = {};
	state.destIndex = -1;
	state.haveDest = false;
	state.haveSrc = false;

	// Callback for destination linode network details API call
	var displayDestNet = function(response)
	{
		data.destNet = response;
		state.haveDest = true;
		if (state.haveSrc)
			displayIPs();
	};

	// Callback for linode details API call
	var displayDetails = function(response)
	{
		data.linode = response;

		// Set page title and header stuff
		document.title += " // " + data.linode.label;
		ui.linodeLabel.innerHTML = data.linode.label;
		ui.srcLinode.innerHTML = data.linode.label;
		if (data.linode.tags.length == 1) {
			ui.linodeTagLink.href = "/linodes?tag=" + data.linode.tags[0];
			ui.linodeTagLink.innerHTML = "(" + data.linode.tags[0] + ")";
			ui.linodeTag.style.display = "inline";
		}

		// Get other Linodes in the same DC
		var filter = {
			"region": data.linode.region
		};
		apiGet("/linode/instances", displayLinodes, filter);
		apiGet("/linode/instances/" + data.params.lid + "/ips", displaySrcNet, null);
	};

	// Populate swap table with source and dest IPs
	var displayIPs = function()
	{
		// Add public IPs
		var numIPs = Math.max(data.srcNet.ipv4["public"].length, data.destNet.ipv4["public"].length);
		for (var i = 0; i < numIPs; i++) {
			var row = document.createElement("tr");
			row.className = elements.lmcRow;

			var srcAddr = document.createElement("td");
			var srcMove = document.createElement("td");
			if (data.srcNet.ipv4["public"][i]) {
				var ip = document.createElement("span");
				ip.innerHTML = data.srcNet.ipv4["public"][i].address;
				var br = document.createElement("br");
				var rdns = document.createElement("span");
				rdns.className = elements.info;
				rdns.innerHTML = data.srcNet.ipv4["public"][i].rdns;
				srcAddr.appendChild(ip);
				srcAddr.appendChild(br);
				srcAddr.appendChild(rdns);

				var move = document.createElement("input");
				move.id = data.srcNet.ipv4["public"][i].address;
				move.className = elements.srcClass;
				move.type = "checkbox";
				srcMove.appendChild(move);
			}

			row.appendChild(srcAddr);
			row.appendChild(srcMove);
			var arrow = document.createElement("td");
			arrow.innerHTML = "↔";
			row.appendChild(arrow);

			var destAddr = document.createElement("td");
			var destMove = document.createElement("td");
			if (data.destNet.ipv4["public"][i]) {
				var ip = document.createElement("span");
				ip.innerHTML = data.destNet.ipv4["public"][i].address;
				var br = document.createElement("br");
				var rdns = document.createElement("span");
				rdns.className = elements.info;
				rdns.innerHTML = data.destNet.ipv4["public"][i].rdns;
				destAddr.appendChild(ip);
				destAddr.appendChild(br);
				destAddr.appendChild(rdns);

				var move = document.createElement("input");
				move.id = data.destNet.ipv4["public"][i].address;
				move.className = elements.destClass;
				move.type = "checkbox";
				destMove.appendChild(move);
			}

			row.appendChild(destMove);
			row.appendChild(destAddr);
			ui.publicIPs.appendChild(row);
		}

		// Add private IPs
		var numIPs = Math.max(data.srcNet.ipv4["private"].length, data.destNet.ipv4["private"].length);
		for (var i = 0; i < numIPs; i++) {
			var row = document.createElement("tr");
			row.className = elements.lmcRow;

			var srcAddr = document.createElement("td");
			var srcMove = document.createElement("td");
			if (data.srcNet.ipv4["private"][i]) {
				var ip = document.createElement("span");
				ip.innerHTML = data.srcNet.ipv4["private"][i].address;
				var br = document.createElement("br");
				var rdns = document.createElement("span");
				rdns.className = elements.info;
				rdns.innerHTML = data.srcNet.ipv4["private"][i].rdns;
				srcAddr.appendChild(ip);
				srcAddr.appendChild(br);
				srcAddr.appendChild(rdns);

				var move = document.createElement("input");
				move.id = data.srcNet.ipv4["private"][i].address;
				move.className = elements.srcClass;
				move.type = "checkbox";
				srcMove.appendChild(move);
			}

			row.appendChild(srcAddr);
			row.appendChild(srcMove);
			var arrow = document.createElement("td");
			arrow.innerHTML = "↔";
			row.appendChild(arrow);

			var destAddr = document.createElement("td");
			var destMove = document.createElement("td");
			if (data.destNet.ipv4["private"][i]) {
				var ip = document.createElement("span");
				ip.innerHTML = data.destNet.ipv4["private"][i].address;
				var br = document.createElement("br");
				var rdns = document.createElement("span");
				rdns.className = elements.info;
				rdns.innerHTML = data.destNet.ipv4["private"][i].rdns;
				destAddr.appendChild(ip);
				destAddr.appendChild(br);
				destAddr.appendChild(rdns);

				var move = document.createElement("input");
				move.id = data.destNet.ipv4["private"][i].address;
				move.className = elements.destClass;
				move.type = "checkbox";
				destMove.appendChild(move);
			}

			row.appendChild(destMove);
			row.appendChild(destAddr);
			ui.privateIPs.appendChild(row);
		}

		ui.doIt.disabled = false;
		ui.selectButton.disabled = false;
	};

	// Callback for linodes API call
	var displayLinodes = function(response)
	{
		// Add linodes to array
		data.linodes = data.linodes.concat(response.data);

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			var filter = {
				"region": data.linode.region
			};
			apiGet("/linode/instances?page=" + (response.page + 1), displayLinodes, filter);
			return;
		}

		// Add linodes to selector
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].id == data.linode.id)
				continue;

			var option = document.createElement("option");
			option.value = data.linodes[i].id;
			option.innerHTML = data.linodes[i].label;
			ui.linodeSelect.appendChild(option);
		}
		ui.selectButton.disabled = false;
	};

	// Callback for source linode network details API call
	var displaySrcNet = function(response)
	{
		data.srcNet = response;
		state.haveSrc = true;
		if (state.haveDest)
			displayIPs();
	};

	// Handler for select button
	var handleSelect = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		state.haveDest = false;

		var lid = parseInt(ui.linodeSelect.value);
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].id == lid) {
				state.destIndex = i;
				break;
			}
		}
		if (state.destIndex == -1)
			return;

		ui.doIt.disabled = true;
		ui.selectButton.disabled = true;
		ui.publicIPs.innerHTML = "";
		ui.privateIPs.innerHTML = "";
		ui.destLinode.innerHTML = data.linodes[state.destIndex].label;
		apiGet("/linode/instances/" + data.linodes[state.destIndex].id + "/ips", displayDestNet, null);
	};

	// Handler for "do it" button
	var handleSwap = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		var assignments = [];

		// Assign all checked source IPs to the destination Linode
		var srcBoxes = document.getElementsByClassName(elements.srcClass);
		for (var i = 0; i < srcBoxes.length; i++) {
			if (!srcBoxes[i].checked)
				continue;

			assignments.push({
				"address": srcBoxes[i].id,
				"linode_id": data.linodes[state.destIndex].id
			});
		}

		// Assign all checked destination IPs to the source Linode
		var destBoxes = document.getElementsByClassName(elements.destClass);
		for (var i = 0; i < destBoxes.length; i++) {
			if (!destBoxes[i].checked)
				continue;

			assignments.push({
				"address": destBoxes[i].id,
				"linode_id": data.linode.id
			});
		}

		if (!assignments.length)
			return;

		var req = {
			"assignments": assignments,
			"region": data.linode.region
		};
		apiPost("/networking/ipv4/assign", req, function(response) {
			location.href = "/linodes/remote_access?lid=" + data.params.lid;
		});
	};

	// Initial setup
	var setup = function()
	{
		// Parse URL parameters
		data.params = parseParams();

		// We need a Linode ID, so die if we don't have it
		if (!data.params.lid) {
			alert("No Linode ID supplied!");
			return;
		}

		setupHeader();

		// Update links on page to include proper Linode ID
		var anchors = document.getElementsByTagName("a");
		for (var i = 0; i < anchors.length; i++)
			anchors[i].href = anchors[i].href.replace("lid=0", "lid=" + data.params.lid);

		// Highlight the remote access subnav link
		var subnavLinks = document.getElementsByClassName(elements.subnav);
		for (var i = 0; i < subnavLinks.length; i++) {
			if (subnavLinks[i].pathname == "/linodes/remote_access")
				subnavLinks[i].className += " " + elements.subnavActive;
		}

		// Get element references
		ui.destLinode = document.getElementById(elements.destLinode);
		ui.doIt = document.getElementById(elements.doIt);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeSelect = document.getElementById(elements.linodeSelect);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.privateIPs = document.getElementById(elements.privateIPs);
		ui.publicIPs = document.getElementById(elements.publicIPs);
		ui.selectButton = document.getElementById(elements.selectButton);
		ui.srcLinode = document.getElementById(elements.srcLinode);

		// Add event handlers
		ui.selectButton.addEventListener("click", handleSelect);
		ui.doIt.addEventListener("click", handleSwap);

		// Get data from API
		apiGet("/linode/instances/" + data.params.lid, displayDetails, null);
	};

	// Attach onload handler
	window.addEventListener("load", setup);
})();