/*
 * 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, migrateETA, parseParams, setupHeader } from "/global.js";

(function()
{
	// Element names specific to this page
	elements.autoResize = "auto-resize";
	elements.autoResizeBox = "auto-resize-box";
	elements.current = "current";
	elements.dedicated = "dedicated";
	elements.diskName = "disk-name";
	elements.eta = "eta";
	elements.gpu = "gpu";
	elements.instanceType = "instance-type";
	elements.highmem = "highmem";
	elements.linodeLabel = "linode-label";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.nanode = "nanode";
	elements.premium = "premium";
	elements.resizeButton = "resize-button";
	elements.standard = "standard";

	// Data received from API calls
	var data = {};
	data.disks = [];
	data.linode = {};
	data.types = [];

	// Static references to UI elements
	var ui = {};
	ui.autoResize = {};
	ui.autoResizeBox = {};
	ui.dedicated = {};
	ui.diskName = {};
	ui.eta = {};
	ui.gpu = {};
	ui.highmem = {};
	ui.linodeLabel = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.nanode = {};
	ui.premium = {};
	ui.resizeButton = {};
	ui.standard = {};

	// Creates a Linode type radio button and label
	var createTypeButton = function(type)
	{
		// Radio button
		var radio = document.createElement("input");
		radio.id = type.id;
		radio.type = "radio";
		radio["name"] = elements.instanceType;
		radio.value = type.id;

		// Label
		var label = document.createElement("label");
		label.htmlFor = type.id;
		label.innerHTML = type.label;

		// Text to display next to current plan
		var current = document.createElement("span");
		current.innerHTML = " (current plan)";

		var br = document.createElement("br");

		// Insert elements
		ui[type["class"]].appendChild(radio);
		ui[type["class"]].appendChild(label);

		if (type.id == data.linode.type) {
			radio.disabled = true;
			label.className = elements.current;
			ui[type["class"]].appendChild(current);
		}

		ui[type["class"]].appendChild(br);
	};

	// 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;
		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";
		} else {
			ui.linodeTag.style.display = "none";
		}

		// Get linode types
		apiGet("/linode/types", displayTypes, null);
	};

	// Callback for linode disks API call
	var displayDisks = function(response)
	{
		// Add disks to array
		data.disks = data.disks.concat(response.data);

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			apiGet("/linode/instances/" + data.params.lid + "/disks?page=" + (response.page + 1), displayDisks, null);
			return;
		}

		// Compute total size and types of disks
		var size = 0;
		var numExt = 0;
		var numSwap = 0;
		for (var i = 0; i < data.disks.length; i++) {
			size += data.disks[i].size;
			if (data.disks[i].filesystem.match(/ext3|ext4/)) {
				numExt++;
				ui.diskName.innerHTML = data.disks[i].label;
			}
			else if (data.disks[i].filesystem == "swap")
				numSwap++;
		}

		// Compute estimated resize time
		ui.eta.innerHTML = migrateETA(size, true);

		// Show auto-resize option if there is only a single ext disk
		if ((data.disks.length == 1 && numExt == 1) || (data.disks.length == 2 && numExt == 1 && numSwap == 1)) {
			ui.autoResizeBox.disabled = false;
			ui.autoResizeBox.checked = true;
			ui.autoResize.style.display = "block";
		}
	};

	// Callback for linode types API call
	var displayTypes = function(response)
	{
		// Add types to array
		data.types = data.types.concat(response.data);

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			apiGet("/linode/types?page=" + (response.page + 1), displayTypes, null);
			return;
		}

		// Insert types
		for (var i = 0; i < data.types.length; i++)
			createTypeButton(data.types[i]);

		ui.resizeButton.disabled = false;
	};

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

		// Find the selected type
		var type = null;
		var inputs = document.getElementsByTagName("input");
		for (var i = 0; i < inputs.length; i++) {
			if (inputs[i]["name"] == elements.instanceType && inputs[i].checked) {
				type = inputs[i];
				break;
			}
		}


		if (!type) {
			alert("You must choose a new plan.");
			return;
		}

		if (!confirm("Immediately shut down, migrate your Linode, and invoice this account for the difference?"))
			return;

		var request = {
			"type": type.id,
			"allow_auto_disk_resize": (!ui.autoResizeBox.disabled && ui.autoResizeBox.checked)
		};
		apiPost("/linode/instances/" + data.params.lid + "/resize", request, function(response)
		{
			location.href = "/linodes/dashboard?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);

		// Get element references
		ui.autoResize = document.getElementById(elements.autoResize);
		ui.autoResizeBox = document.getElementById(elements.autoResizeBox);
		ui.dedicated = document.getElementById(elements.dedicated);
		ui.diskName = document.getElementById(elements.diskName);
		ui.eta = document.getElementById(elements.eta);
		ui.gpu = document.getElementById(elements.gpu);
		ui.highmem = document.getElementById(elements.highmem);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.nanode = document.getElementById(elements.nanode);
		ui.premium = document.getElementById(elements.premium);
		ui.resizeButton = document.getElementById(elements.resizeButton);
		ui.standard = document.getElementById(elements.standard);

		// Register resize button handler
		ui.resizeButton.addEventListener("click", handleResize);

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

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