/*
 * 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, regionNames, setupHeader, timeString } from "/global.js";

(function()
{
	// Element names specific to this page
	elements.backupAge = "backup-age";
	elements.backupConfigs = "backup-configs";
	elements.backupDate = "backup-date";
	elements.backupDisks = "backup-disks";
	elements.backupLabel = "backup-label";
	elements.backupLocation = "backup-location";
	elements.backupSize = "backup-size";
	elements.backupType = "backup-type";
	elements.destLabel = "dest-label";
	elements.destLinodes = "dest-linodes";
	elements.destLocation = "dest-location";
	elements.destPlan = "dest-plan";
	elements.destSpace = "dest-space";
	elements.linodeLabel = "linode-label";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.loading = "loading-linodes";
	elements.lmcRow = "lmc-tr3";
	elements.newLinode = "new-linode";
	elements.restorePrefix = "restore-";
	elements.selectPrefix = "select-";
	elements.subnav = "subnav-link";
	elements.subnavActive = "subnav-link-active";
	elements.unallocatedPrefix = "unallocated-";

	// Data recieved from API calls
	var data = {};
	data.backup = {};
	data.linode = {};
	data.linodes = [];
	data.region = {};
	data.types = [];

	// Static references to UI elements
	var ui = {};
	ui.backupAge = {};
	ui.backupConfigs = {};
	ui.backupDate = {};
	ui.backupDisks = {};
	ui.backupLabel = {};
	ui.backupLocation = {};
	ui.backupSize = {};
	ui.backupType = {};
	ui.destLabel = {};
	ui.destLinodes = {};
	ui.destLocation = {};
	ui.destPlan = {};
	ui.destSpace = {};
	ui.linodeLabel = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.loading = {};
	ui.newLinode = {};

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

	// Generate a linode table row
	var createLinodeRow = function(linode)
	{
		var row = document.createElement("tr");
		row.className = elements.lmcRow;

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

		var plan = document.createElement("td");
		if (linode.type) {
			plan.innerHTML = linode.type;
			for (var i = 0; i < data.types.length; i++) {
				if (data.types[i].id == linode.type) {
					plan.innerHTML = data.types[i].label;
					break;
				}
			}
		} else {
			plan.innerHTML = "Unknown";
		}
		if (plan.innerHTML == "")
			translatePlan(linode.type, plan);
		row.appendChild(plan);

		var location = document.createElement("td");
		if (data.region.label && data.region.label.length)
			location.innerHTML = data.region.label;
		else if (regionNames[linode.region])
			location.innerHTML = regionNames[linode.region];
		else
			location.innerHTML = linode.region;
		row.appendChild(location);

		var freeSpace = document.createElement("td");
		freeSpace.id = elements.unallocatedPrefix + linode.id;
		row.appendChild(freeSpace);

		var select = document.createElement("td");
		select.id = elements.selectPrefix + linode.id;
		row.appendChild(select);

		return row;
	};

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

		// Populate info table
		if (data.backup.label)
			ui.backupLabel.innerHTML = data.backup.label;

		var now = new Date();
		var backupStart = new Date(data.backup.created + "Z");
		ui.backupDate.innerHTML = backupStart.toLocaleString();
		ui.backupAge.innerHTML = timeString(now - backupStart, true);

		ui.backupType.innerHTML = data.backup.type;

		if (regionNames[data.backup.region]) {
			ui.backupLocation.innerHTML = regionNames[data.backup.region];
			ui.destLocation.innerHTML = regionNames[data.backup.region];
		} else {
			ui.backupLocation.innerHTML = data.backup.region;
			ui.destLocation.innerHTML = data.backup.region;
		}
		apiGet("/regions/" + data.backup.region, displayRegion, null);

		for (var i = 0; i < data.backup.configs.length; i++) {
			var li = document.createElement("li");
			li.innerHTML = data.backup.configs[i];
			ui.backupConfigs.appendChild(li);
		}

		data.backup.totalSize = 0;
		for (var i = 0; i < data.backup.disks.length; i++) {
			data.backup.totalSize += data.backup.disks[i].size;
			var li = document.createElement("li");
			li.innerHTML = data.backup.disks[i].label + " (" + data.backup.disks[i].filesystem + ") – " + data.backup.disks[i].size + "MB";
			ui.backupDisks.appendChild(li);
		}

		ui.backupSize.innerHTML = data.backup.totalSize + " MB";

		if (state.haveTypes)
			insertTypes();
	};

	// 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";
		}
	};

	// Callback for linode disks API call
	var displayDisks = function(response)
	{
		// Find the linode this response is for
		var lid = parseInt(response['_endpoint'].split("/")[3]);
		var index = -1;
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].id == lid) {
				index = i;
				break;
			}
		}

		if (index == -1)
			return;

		// Add disks to array
		data.linodes[index].disks = data.linodes[index].disks.concat(response.data);

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

		// Calculate Linode's free space
		var free = data.linodes[index].specs.disk;
		for (var i = 0; i < data.linodes[index].disks.length; i++)
			free -= data.linodes[index].disks[i].size;

		// Update table
		var freeCell = document.getElementById(elements.unallocatedPrefix + data.linodes[index].id);
		var selectCell = document.getElementById(elements.selectPrefix + data.linodes[index].id);
		freeCell.innerHTML = free + " MB";
		if (free >= data.backup.totalSize) {
			var restoreLink = document.createElement("a");
			restoreLink.id = elements.restorePrefix + data.linodes[index].id;
			restoreLink.href = "#";
			restoreLink.innerHTML = "Restore to this Linode";
			restoreLink.addEventListener("click", handleRestore);
			selectCell.appendChild(restoreLink);
		} else {
			selectCell.innerHTML = "--- not enough free space ---";
		}
	};

	// 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.backup.region
			};
			apiGet("/linode/instances?page=" + (response.page + 1), displayLinodes, filter);
			return;
		}

		ui.loading.remove();
		for (var i = 0; i < data.linodes.length; i++) {
			// Create row in the table
			ui.destLinodes.appendChild(createLinodeRow(data.linodes[i]));
			// Get the linode's disks
			data.linodes[i].disks = [];
			apiGet("/linode/instances/" + data.linodes[i].id + "/disks", displayDisks, null);
		}
	};

	// Callback for region API call
	var displayRegion = function(response)
	{
		data.region = response;

		if (data.region.label && data.region.label.length) {
			ui.backupLocation.innerHTML = response.label;
			ui.destLocation.innerHTML = response.label;
		}
	};

	// 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;
		}

		state.haveTypes = true;
		if (data.backup.id)
			insertTypes();
	};

	// Handler for create linode button
	var handleCreate = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		// Find the selected type
		var index = -1;
		for (var i = 0; i < data.types.length; i++) {
			if (data.types[i].id == ui.destPlan.value) {
				index = i;
				break;
			}
		}

		if (index == -1)
			return;

		if (!confirm("Create a new " + data.types[i].label + " from this backup? This new instance will cost $" + data.types[i].price.monthly.toFixed(2) + " per month and backups will be enabled per your global account setting."))
			return;

		var req = {
			"label": ui.destLabel.value,
			"type": ui.destPlan.value,
			"region": data.backup.region,
			"backup_id": data.backup.id
		};
		var callback = function(response)
		{
			location.href = "/linodes/dashboard?lid=" + response.id;
		};
		apiPost("/linode/instances", req, callback);
	};

	// Handler for backup restore links
	var handleRestore = function(event)
	{
		// Find the linode associated with this link
		var lid = parseInt(event.currentTarget.id.replace(elements.restorePrefix, ""));
		var index = -1;
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].id == lid) {
				index = i;
				break;
			}
		}

		if (index == -1)
			return;
		if (!confirm("Restore to Linode " + data.linodes[index].label + "?"))
			return;

		var req = {
			"linode_id": lid,
			"overwrite": false
		};

		var callback = function(response)
		{
			location.href = "/linodes/dashboard?lid=" + lid;
		};
		apiPost("/linode/instances/" + data.params.lid + "/backups/" + data.backup.id + "/restore", req, callback);
	};

	// Insert linode types into selector
	var insertTypes = function()
	{
		for (var i = 0; i < data.types.length; i++) {
			if (data.types[i].disk < data.backup.totalSize)
				continue;

			var option = document.createElement("option");
			option.value = data.types[i].id;
			option.innerHTML = data.types[i].label;
			ui.destPlan.appendChild(option);
		}

		updateSpace(null);
		ui.newLinode.disabled = false;

		var filter = {
			"region": data.backup.region
		};
		apiGet("/linode/instances", displayLinodes, filter);
	};

	// 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 backup ID
		if (!data.params.bid) {
			alert("No Backup 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 backups subnav link
		var subnavLinks = document.getElementsByClassName(elements.subnav);
		for (var i = 0; i < subnavLinks.length; i++) {
			if (subnavLinks[i].pathname == "/linodes/backups")
				subnavLinks[i].className += " " + elements.subnavActive;
		}

		// Get element references
		ui.backupAge = document.getElementById(elements.backupAge);
		ui.backupConfigs = document.getElementById(elements.backupConfigs);
		ui.backupDate = document.getElementById(elements.backupDate);
		ui.backupDisks = document.getElementById(elements.backupDisks);
		ui.backupLabel = document.getElementById(elements.backupLabel);
		ui.backupLocation = document.getElementById(elements.backupLocation);
		ui.backupSize = document.getElementById(elements.backupSize);
		ui.backupType = document.getElementById(elements.backupType);
		ui.destLabel = document.getElementById(elements.destLabel);
		ui.destLinodes = document.getElementById(elements.destLinodes);
		ui.destLocation = document.getElementById(elements.destLocation);
		ui.destPlan = document.getElementById(elements.destPlan);
		ui.destSpace = document.getElementById(elements.destSpace);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.loading = document.getElementById(elements.loading);
		ui.newLinode = document.getElementById(elements.newLinode);

		// Register event handlers
		ui.destPlan.addEventListener("input", updateSpace);
		ui.newLinode.addEventListener("click", handleCreate);

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

	// Update the given element with the given type's label
	var translatePlan = function(type, el)
	{
		var callback = function(response)
		{
			el.innerHTML = response.label;
		};

		apiGet("/linode/types/" + type, callback, null);
	};

	// Update the price display
	var updateSpace = function(event)
	{
		// Find the selected type
		var type = null;
		for (var i = 0; i < data.types.length; i++) {
			if (data.types[i].id == ui.destPlan.value) {
				type = data.types[i];
				break;
			}
		}

		if (!type)
			return;

		ui.destSpace.innerHTML = type.disk;
	};

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