/*
 * 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, apiDelete, apiGet, apiPost, apiPut, parseParams, setupHeader } from "/global.js";

(function()
{
	// Element names specific to this page
	elements.algorithm = "algorithm";
	elements.centerCell = "center-cell";
	elements.checkAttempts = "check-attempts";
	elements.checkBody = "check-body";
	elements.checkInterval = "check-interval";
	elements.checkPath = "check-path";
	elements.checkShow = "check-show";
	elements.checkTimeout = "check-timeout";
	elements.checkType = "check-type";
	elements.cipherSuite = "cipher-suite";
	elements.commonName = "common-name";
	elements.configLabel = "config-label";
	elements.fingerprint = "fingerprint";
	elements.lmcRow = "lmc-tr1";
	elements.lmcRowAlt = "lmc-tr2";
	elements.nodebalancerLabel = "nodebalancer-label";
	elements.nodebalancerTag = "nodebalancer-tag";
	elements.nodebalancerTagLink = "nodebalancer-tag-link";
	elements.nodesTable = "nodes-table";
	elements.nonzero = "nonzero";
	elements.passive = "passive";
	elements.port = "port";
	elements.protocol = "protocol";
	elements.protocolShow = "protocol-show";
	elements.proxyProtocol = "proxy-protocol";
	elements.removePrefix = "remove-node-";
	elements.replaceCert = "replace-cert";
	elements.replaceCertOnly = "replace-cert-only";
	elements.replaceLink = "replace-link";
	elements.saveButton = "save-button";
	elements.sslCert = "ssl-cert";
	elements.sslKey = "ssl-key";
	elements.stickiness = "stickiness";

	// Data recieved from API calls
	var data = {};
	data.config = {};
	data.nodebalancer = {};
	data.nodes = [];

	// Static references to UI elements
	var ui = {};
	ui.algorithm = {};
	ui.checkAttempts = {};
	ui.checkBody = {};
	ui.checkInterval = {};
	ui.checkPath = {};
	ui.checkShow = [];
	ui.checkTimeout = {};
	ui.checkType = {};
	ui.cipherSuite = {};
	ui.commonName = {};
	ui.configLabel = {};
	ui.fingerprint = {};
	ui.nodebalancerLabel = {};
	ui.nodebalancerTag = {};
	ui.nodebalancerTagLink = {};
	ui.nodesTable = {};
	ui.passive = {};
	ui.port = {};
	ui.protocol = {};
	ui.protocolShow = [];
	ui.proxyProtocol = {};
	ui.saveButton = {};
	ui.replaceLink = {};
	ui.sslCert = {};
	ui.sslKey = {};
	ui.stickiness = {};

	// Temporary State
	var state = {};
	state.replaceCert = true;

	// Create a row for the nodes table
	var createNodeRow = function(node, alt)
	{
		var row = document.createElement("tr");
		if (alt)
			row.className = elements.lmcRowAlt;
		else
			row.className = elements.lmcRow;

		var label = document.createElement("td");
		label.innerHTML = node.label;
		row.appendChild(label);

		var address = document.createElement("td");
		var lastColon = node.address.lastIndexOf(":");
		address.innerHTML = node.address.slice(0, lastColon);
		row.appendChild(address);

		var port = document.createElement("td");
		port.innerHTML = node.address.slice(lastColon + 1);
		row.appendChild(port);

		var weight = document.createElement("td");
		weight.innerHTML = node.weight;
		row.appendChild(weight);

		var mode = document.createElement("td");
		mode.innerHTML = node.mode.charAt(0).toUpperCase() + node.mode.slice(1);
		row.appendChild(mode);

		var status = document.createElement("td");
		status.innerHTML = node.status;
		row.appendChild(status);

		var options = document.createElement("td");
		options.className = elements.centerCell;
		var editLink = document.createElement("a");
		editLink.href = "/nodebalancers/node?nbid=" + data.params.nbid + "&nbcid=" + data.params.nbcid + "&nbnid=" + node.id;
		editLink.innerHTML = "Edit";
		var separator = document.createElement("span");
		separator.innerHTML = " | ";
		var removeLink = document.createElement("a");
		removeLink.id = elements.removePrefix + node.id;
		removeLink.href = "#";
		removeLink.innerHTML = "Remove";
		removeLink.addEventListener("click", handleRemoveNode);
		options.appendChild(editLink);
		options.appendChild(separator);
		options.appendChild(removeLink);
		row.appendChild(options);

		return row;
	};

	// Callback for config API call
	var displayConfig = function(response)
	{
		data.config = response;

		ui.configLabel.innerHTML = "Port " + data.config.port;
		ui.port.value = data.config.port;
		ui.protocol.value = data.config.protocol;
		ui.proxyProtocol.value = data.config.proxy_protocol;
		ui.algorithm.value = data.config.algorithm;
		ui.stickiness.value = data.config.stickiness;
		ui.commonName.innerHTML = data.config.ssl_commonname;
		ui.fingerprint.innerHTML = data.config.ssl_fingerprint;
		ui.cipherSuite.value = data.config.cipher_suite;
		ui.checkType.value = data.config.check;
		ui.checkInterval.value = data.config.check_interval;
		ui.checkTimeout.value = data.config.check_timeout;
		ui.checkAttempts.value = data.config.check_attempts;
		ui.checkPath.value = data.config.check_path;
		ui.checkBody.value = data.config.check_body;
		ui.passive.checked = data.config.check_passive;
		state.replaceCert = (!data.config.ssl_key || data.config.ssl_key.indexOf("<REDACTED>") == -1);

		ui.saveButton.disabled = false;

		showHideChecks();
		showHideProtocol();
	};

	// Callback for nodebalancer API call
	var displayNodebalancer = function(response)
	{
		data.nodebalancer = response;

		// Set page title and header stuff
		if (document.title.indexOf("//") == -1)
			document.title += " // Edit " + data.nodebalancer.label;
		ui.nodebalancerLabel.innerHTML = data.nodebalancer.label;
		if (data.nodebalancer.tags.length == 1) {
			ui.nodebalancerTagLink.href = "/nodebalancers?tag=" + data.nodebalancer.tags[0];
			ui.nodebalancerTagLink.innerHTML = "(" + data.nodebalancer.tags[0] + ")";
			ui.nodebalancerTag.style.display = "inline";
		} else {
			ui.nodebalancerTag.style.display = "none";
		}
	};

	// Callback for nodes API call
	var displayNodes = function(response)
	{
		data.nodes = data.nodes.concat(response.data);

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			apiGet("/nodebalancers/" + data.params.nbid + "/configs/" + data.params.nbcid + "/nodes?page=" + (response.page + 1), displayNodes, null);
			return;
		}

		// Insert nodes into table
		for (var i = 0; i < data.nodes.length; i++)
			ui.nodesTable.appendChild(createNodeRow(data.nodes[i], i % 2));
	};

	// Remove node handler
	var handleRemoveNode = function(event)
	{
		if (!confirm("Are you sure you want to remove this node?"))
			return;

		var nbnid = event.currentTarget.id.substring(elements.removePrefix.length);
		apiDelete("/nodebalancers/" + data.params.nbid + "/configs/" + data.params.nbcid + "/nodes/" + nbnid, function()
		{
			location.reload();
		});
	};

	// Replace link handler
	var handleReplace = function(event)
	{
		state.replaceCert = true;
		showHideProtocol();
	};

	// Save button handler
	var handleSave = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		var req = {
			"port": parseInt(ui.port.value),
			"protocol": ui.protocol.value,
			"algorithm": ui.algorithm.value,
			"stickiness": ui.stickiness.value,
			"check": ui.checkType.value,
			"check_passive": ui.passive.checked
		};

		if (ui.protocol.value == "tcp") {
			req.proxy_protocol = ui.proxyProtocol.value;
		} else if (ui.protocol.value == "https") {
			req.cipher_suite = ui.cipherSuite.value;
			if (state.replaceCert) {
				req.ssl_cert = ui.sslCert.value;
				req.ssl_key = ui.sslKey.value;
			}
		}

		switch (ui.checkType.value) {
		case "http_body":
			req.check_body = ui.checkBody.value;
		case "http":
			req.check_path = ui.checkPath.value;
		case "connection":
			req.check_interval = parseInt(ui.checkInterval.value);
			req.check_timeout = parseInt(ui.checkTimeout.value);
			req.check_attempts = parseInt(ui.checkAttempts.value);
		}

		if (data.params.nbcid == 0) {
			apiPost("/nodebalancers/" + data.params.nbid + "/configs", req, function(response)
			{
				location.href = "/nodebalancers/config?nbid=" + data.params.nbid + "&nbcid=" + response.id;
			});
		} else {
			apiPut("/nodebalancers/" + data.params.nbid + "/configs/" + data.params.nbcid, req, function(response)
			{
				location.href = "/nodebalancers/balancer?nbid=" + data.params.nbid;
			});
		}
	};

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

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

		// We also need a config ID
		if (!data.params.nbcid) {
			alert("No config 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("nbid=0", "nbid=" + data.params.nbid);
			anchors[i].href = anchors[i].href.replace("nbcid=0", "nbcid=" + data.params.nbcid);
		}

		// Get element references
		ui.algorithm = document.getElementById(elements.algorithm);
		ui.checkAttempts = document.getElementById(elements.checkAttempts);
		ui.checkBody = document.getElementById(elements.checkBody);
		ui.checkInterval = document.getElementById(elements.checkInterval);
		ui.checkPath = document.getElementById(elements.checkPath);
		ui.checkShow = document.getElementsByClassName(elements.checkShow);
		ui.checkTimeout = document.getElementById(elements.checkTimeout);
		ui.checkType = document.getElementById(elements.checkType);
		ui.cipherSuite = document.getElementById(elements.cipherSuite);
		ui.commonName = document.getElementById(elements.commonName);
		ui.configLabel = document.getElementById(elements.configLabel);
		ui.fingerprint = document.getElementById(elements.fingerprint);
		ui.nodebalancerLabel = document.getElementById(elements.nodebalancerLabel);
		ui.nodebalancerTag = document.getElementById(elements.nodebalancerTag);
		ui.nodebalancerTagLink = document.getElementById(elements.nodebalancerTagLink);
		ui.nodesTable = document.getElementById(elements.nodesTable);
		ui.passive = document.getElementById(elements.passive);
		ui.port = document.getElementById(elements.port);
		ui.protocol = document.getElementById(elements.protocol);
		ui.protocolShow = document.getElementsByClassName(elements.protocolShow);
		ui.proxyProtocol = document.getElementById(elements.proxyProtocol);
		ui.replaceLink = document.getElementById(elements.replaceLink);
		ui.saveButton = document.getElementById(elements.saveButton);
		ui.sslCert = document.getElementById(elements.sslCert);
		ui.sslKey = document.getElementById(elements.sslKey);
		ui.stickiness = document.getElementById(elements.stickiness);

		// Register event handlers
		ui.checkType.addEventListener("input", showHideChecks);
		ui.protocol.addEventListener("input", showHideProtocol);
		ui.replaceLink.addEventListener("click", handleReplace);
		ui.saveButton.addEventListener("click", handleSave);

		// Get data from API
		apiGet("/nodebalancers/" + data.params.nbid, displayNodebalancer, null);
		if (parseInt(data.params.nbcid)) {
			apiGet("/nodebalancers/" + data.params.nbid + "/configs/" + data.params.nbcid, displayConfig, null);
			apiGet("/nodebalancers/" + data.params.nbid + "/configs/" + data.params.nbcid + "/nodes", displayNodes, null);
		} else {
			ui.configLabel.innerHTML = "Create Configuration";
			ui.saveButton.disabled = false;
			var hideElements = document.getElementsByClassName(elements.nonzero);
			for (var i = 0; i < hideElements.length; i++)
				hideElements[i].style.display = "none";
		}
	};

	// Show/hide check rows
	var showHideChecks = function(event)
	{
		for (var i = 0; i < ui.checkShow.length; i++) {
			if (ui.checkShow[i].classList.contains(elements.checkShow + "-" + ui.checkType.value))
				ui.checkShow[i].style.display = "table-row";
			else
				ui.checkShow[i].style.display = "none";
		}
	};

	// Show/hide protocol stuff
	var showHideProtocol = function(event)
	{
		for (var i = 0; i < ui.protocolShow.length; i++) {
			if (ui.protocolShow[i].classList.contains(elements.protocolShow + "-" + ui.protocol.value)) {
				if (ui.protocolShow[i].classList.contains(elements.replaceCert)) {
					if (ui.protocolShow[i].classList.contains(elements.replaceCertOnly) == state.replaceCert)
						ui.protocolShow[i].style.display = "table-row";
					else
						ui.protocolShow[i].style.display = "none";
				} else {
					ui.protocolShow[i].style.display = "table-row";
				}
			} else {
				ui.protocolShow[i].style.display = "none";
			}
		}

		if (data.params.nbcid == 0 && ui.protocol.value == "http")
			ui.port.value = 80;
		if (data.params.nbcid == 0 && ui.protocol.value == "https")
			ui.port.value = 443;
	};

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