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

(function()
{
	// Element names specific to this page
	elements.backupDay = "backup-day";
	elements.backupTable = "backup-table";
	elements.backupWindow = "backup-window";
	elements.inProgress = "in-progress";
	elements.linodeLabel = "linode-label";
	elements.linodeTag = "linode-tag";
	elements.linodeTagLink = "linode-tag-link";
	elements.lmcRow = "lmc-tr3";
	elements.saveButton = "save-button";
	elements.scheduleUpdated = "schedule-updated";
	elements.snapshotButton = "snapshot-button";
	elements.snapshotLabel = "snapshot-label";
	elements.timezone = "timezone";
	elements.window = "window";

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

	// Static references to UI elements
	var ui = {};
	ui.backupDay = {};
	ui.backupTable = {};
	ui.backupWindow = {};
	ui.inProgress = {};
	ui.linodeLabel = {};
	ui.linodeTag = {};
	ui.linodeTagLink = {};
	ui.saveButton = {};
	ui.scheduleUpdated = {};
	ui.snapshotButton = {};
	ui.snapshotLabel = {};
	ui.timezone = {};
	ui.windows = [];

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

		var type = document.createElement("td");
		type.innerHTML = backup.type;
		row.appendChild(type);

		var started = document.createElement("td");
		var startedDate = new Date(backup.created + "Z");
		started.innerHTML = startedDate.toLocaleString();
		row.appendChild(started);

		var finished = document.createElement("td");
		if (backup.finished) {
			var finishedDate = new Date(backup.finished + "Z");
			finished.innerHTML = finishedDate.toLocaleString();
		}
		row.appendChild(finished);

		var duration = document.createElement("td");
		if (backup.finished)
			duration.innerHTML = timeString(finishedDate - startedDate, false);
		row.appendChild(duration);

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

		var restore = document.createElement("td");
		if (backup.status == "successful") {
			var restoreLink = document.createElement("a");
			restoreLink.href = "/linodes/backup_details?lid=" + data.params.lid + "&bid=" + backup.id;
			restoreLink.innerHTML = "Restore to...";
			restore.appendChild(restoreLink);
		}
		row.appendChild(restore);

		return row;
	};

	// Callback for backups API call
	var displayBackups = function(response)
	{
		data.backups = response;

		// Enable snapshot button if there's no snapshot in progress
		if (!data.backups.snapshot.in_progress) {
			ui.snapshotButton.disabled = false;
		} else {
			ui.snapshotButton.style.display = "none";
			ui.snapshotLabel.style.display = "none";
			ui.inProgress.style.display = "initial";
			ui.backupTable.appendChild(createBackupRow(data.backups.snapshot.in_progress));
		}

		// Sort backups by date
		data.backupsSorted = data.backups.automatic;
		if (data.backups.snapshot.current)
			data.backupsSorted.push(data.backups.snapshot.current);
		data.backupsSorted.sort(function(a, b)
		{
			var startA = new Date(a.created + "Z");
			var startB = new Date(b.created + "Z");
			return startB - startA;
		});

		// Add them to the table
		for (var i = 0; i < data.backupsSorted.length; i++)
			ui.backupTable.appendChild(createBackupRow(data.backupsSorted[i]));
	};

	// 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";
		}

		// Redirect to enable page if backups not enabled
		if (!data.linode.backups.enabled)
			location.href = "/linodes/backups_enable?lid=" + data.params.lid;

		// Set backup settings
		ui.backupWindow.value = data.linode.backups.schedule.window;
		ui.backupDay.value = data.linode.backups.schedule.day;
		ui.saveButton.disabled = false;
	};

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

		var req = {
			"backups": {
				"schedule": {
					"day": ui.backupDay.value,
					"window": ui.backupWindow.value
				}
			}
		};

		apiPut("/linode/instances/" + data.params.lid, req, function(response)
		{
			ui.scheduleUpdated.style.display = "block";
		});
	};

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

		if (!confirm("Taking a snapshot will back up your Linode in its current state, over-writing your previous snapshot. Are you sure?"))
			return;

		var req = {
			"label": ui.snapshotLabel.value
		};

		apiPost("/linode/instances/" + data.params.lid + "/backups", req, function(response)
		{
			location.reload();
		});
	};

	// 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.backupDay = document.getElementById(elements.backupDay);
		ui.backupTable = document.getElementById(elements.backupTable);
		ui.backupWindow = document.getElementById(elements.backupWindow);
		ui.inProgress = document.getElementById(elements.inProgress);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.linodeTag = document.getElementById(elements.linodeTag);
		ui.linodeTagLink = document.getElementById(elements.linodeTagLink);
		ui.saveButton = document.getElementById(elements.saveButton);
		ui.scheduleUpdated = document.getElementById(elements.scheduleUpdated);
		ui.snapshotButton = document.getElementById(elements.snapshotButton);
		ui.snapshotLabel = document.getElementById(elements.snapshotLabel);
		ui.timezone = document.getElementById(elements.timezone);
		ui.windows = document.getElementsByClassName(elements.window);

		// Display timezone info
		var now = new Date();
		var offset = now.getTimezoneOffset() / -60;
		var offsetHours = Math.floor(offset);
		var offsetMins = now.getTimezoneOffset() % 60;
		if (offsetMins < 10)
			offsetMins = "0" + offsetMins;
		ui.timezone.innerHTML = "GMT";
		if (offset >= 0)
			ui.timezone.innerHTML += "+";
		ui.timezone.innerHTML += offset;
		for (var i = 0; i < ui.windows.length; i++) {
			var windowNum = parseInt(ui.windows[i].value.substring(1));
			var startHour = windowNum + offsetHours;
			if (startHour < 0)
				startHour += 24;
			if (startHour < 10)
				startHour = "0" + startHour;
			var endHour = windowNum + offsetHours + 2;
			if (endHour < 0)
				endHour += 24;
			if (endHour < 10)
				endHour = "0" + endHour;
			ui.windows[i].innerHTML = startHour + ":" + offsetMins + " - " + endHour + ":" + offsetMins;
		}

		// Attach button handlers
		ui.saveButton.addEventListener("click", handleSave);
		ui.snapshotButton.addEventListener("click", handleSnapshot);

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

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