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

(function()
{
	// Element names specific to this page
	elements.currentSize = "current-size";
	elements.currentSizeRow = "current-size-row";
	elements.currentType = "current-type";
	elements.duplicateButton = "duplicate-button";
	elements.imageButton = "image-button";
	elements.label = "label";
	elements.linodeLabel = "linode-label";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.maxSize = "max-size";
	elements.resizeAddl = "resize-addl";
	elements.saveButton = "save-button";
	elements.size = "size";
	elements.spaceAllocated = "space-allocated";
	elements.spaceFree = "space-free";
	elements.spaceTotal = "space-total";
	elements.spaceWarning = "space-warning";
	elements.subnav = "subnav-link";
	elements.subnavActive = "subnav-link-active";
	elements.type = "type";

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

	// Static references to UI elements
	var ui = {};
	ui.currentSize = {};
	ui.currentSizeRow = {};
	ui.currentType = {};
	ui.duplicateButton = {};
	ui.imageButton = {};
	ui.label = {};
	ui.linodeLabel = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.maxSize = {};
	ui.resizeAddl = {};
	ui.saveButton = {};
	ui.size = {};
	ui.spaceAllocated = {};
	ui.spaceFree = {};
	ui.spaceTotal = {};
	ui.spaceWarning = {};
	ui.type = {};

	// Temporary state
	var state = {};
	state.haveDisks = false;

	// 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";
		}

		if (state.haveDisks)
			displayStorage();
	};

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

		for (var i = 0; i < data.disks.length; i++) {
			if (data.disks[i].id == data.params.did) {
				data.disk = data.disks[i];
				break;
			}
		}

		state.haveDisks = true;
		if (data.linode.specs)
			displayStorage();

		if (!data.disk)
			return;

		// Update form
		ui.label.value = data.disk.label;
		ui.currentType.innerHTML = data.disk.filesystem;
		ui.currentSize.innerHTML = data.disk.size;
		ui.size.value = data.disk.size;
		if (data.disk.filesystem != "raw" && data.disk.filesystem != "swap")
			ui.imageButton.disabled = false;
	};

	// Show storage totals
	var displayStorage = function()
	{
		var storageUsed = 0;
		for (var i = 0; i < data.disks.length; i++)
			storageUsed += data.disks[i].size;
		var storageFree = data.linode.specs.disk - storageUsed;

		ui.spaceAllocated.innerHTML = storageUsed;
		ui.spaceFree.innerHTML = storageFree;
		ui.spaceTotal.innerHTML = data.linode.specs.disk;

		if (data.params.did == 0) {
			ui.size.max = storageFree;
			ui.maxSize.innerHTML = storageFree;
			if (storageFree <= 0)
				ui.spaceWarning.style.display = "block";
			else
				ui.saveButton.disabled = false;
		}

		if (!data.disk)
			return;

		ui.size.max = storageFree + data.disk.size;
		ui.maxSize.innerHTML = storageFree + data.disk.size;
		ui.saveButton.disabled = false;
		if (storageFree >= data.disk.size)
			ui.duplicateButton.disabled = false;
	};

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

		apiPost("/linode/instances/" + data.params.lid + "/disks/" + data.params.did + "/clone", {}, function(response)
		{
			location.href = "/linodes/dashboard?lid=" + data.params.lid;
		});
	};

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

		location.href = "/images/create?lid=" + data.params.lid + "&did=" + data.params.did;
	};

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

		var diskSize = parseInt(ui.size.value);
		var standardCallback = function(response)
		{
			location.href = "/linodes/dashboard?lid=" + data.params.lid;
		};

		if (data.params.did == 0) {
			var req = {
				"label": ui.label.value,
				"size": diskSize,
				"filesystem": ui.type.value
			};
			apiPost("/linode/instances/" + data.params.lid + "/disks", req, standardCallback);
		} else {
			var labelReq = {
				"label": ui.label.value	
			};
			var resizeReq = {
				"size": diskSize
			};

			if (data.disk.size != diskSize) {
				if (data.disk.label != ui.label.value) {
					apiPut("/linode/instances/" + data.params.lid + "/disks/" + data.params.did, labelReq, function(response)
					{
						apiPost("/linode/instances/" + data.params.lid + "/disks/" + data.params.did + "/resize", resizeReq, standardCallback);
					});
				} else {
					apiPost("/linode/instances/" + data.params.lid + "/disks/" + data.params.did + "/resize", resizeReq, standardCallback);
				}
			} else if (data.disk.label != ui.label.value) {
				apiPut("/linode/instances/" + data.params.lid + "/disks/" + data.params.did, labelReq, standardCallback);
			} else {
				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;
		}

		// We also need a disk ID
		if (!data.params.did) {
			alert("No disk 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=00", data.params.lid);
			anchors[i].href = anchors[i].href.replace("lid=0", "lid=" + data.params.lid);
		}

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

		// Get element references
		ui.currentSize = document.getElementById(elements.currentSize);
		ui.currentSizeRow = document.getElementById(elements.currentSizeRow);
		ui.currentType = document.getElementById(elements.currentType);
		ui.duplicateButton = document.getElementById(elements.duplicateButton);
		ui.imageButton = document.getElementById(elements.imageButton);
		ui.label = document.getElementById(elements.label);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.maxSize = document.getElementById(elements.maxSize);
		ui.resizeAddl = document.getElementById(elements.resizeAddl);
		ui.saveButton = document.getElementById(elements.saveButton);
		ui.size = document.getElementById(elements.size);
		ui.spaceAllocated = document.getElementById(elements.spaceAllocated);
		ui.spaceFree = document.getElementById(elements.spaceFree);
		ui.spaceTotal = document.getElementById(elements.spaceTotal);
		ui.spaceWarning = document.getElementById(elements.spaceWarning);
		ui.type = document.getElementById(elements.type);

		if (data.params.did != 0) {
			ui.currentSizeRow.style.display = "table-row";
			ui.duplicateButton.style.display = "initial";
			ui.imageButton.style.display = "initial";
			ui.type.style.display = "none";
			ui.resizeAddl.style.display = "initial";
		}

		// Register event handlers
		ui.duplicateButton.addEventListener("click", handleDuplicate);
		ui.imageButton.addEventListener("click", handleImage);
		ui.saveButton.addEventListener("click", handleSave);

		// 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);
})();