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

(function()
{
	// Element names specific to this page
	elements.attachButton = "attach-button";
	elements.label = "label";
	elements.linode = "linode";
	elements.volumeLabel = "volume-label";

	// Data recieved from API calls
	var data = {};
	data.volume = {};

	// Static references to UI elements
	var ui = {};
	ui.attachButton = {};
	ui.label = {};
	ui.linode = {};
	ui.volumeLabel = {};

	// Callback for linodes API call
	var displayLinodes = function(response)
	{
		// Add linodes to selector
		for (var i = 0; i < response.data.length; i++) {
			var linode = document.createElement("option");
			linode.value = response.data[i].id;
			linode.innerHTML = response.data[i].label;
			ui.linode.appendChild(linode);
		}

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			var filter = {
				"region": data.volume.region
			};
			apiGet("/linode/instances?page=" + (response.page + 1), displayLinodes, null);
			return;
		}

		ui.attachButton.disabled = false;
	};

	// Callback for volume API call
	var displayVolume = function(response)
	{
		data.volume = response;

		// Redirect to settings if already attached
		if (data.volume.linode_id)
			location.href = "/volumes/settings?vid=" + data.params.vid;

		// Set page title and header stuff
		document.title += " // " + data.volume.label;
		ui.volumeLabel.innerHTML = data.volume.label;
		ui.label.innerHTML = data.volume.label;

		// Get linodes in the same DC
		var filter = {
			"region": data.volume.region
		};
		apiGet("/linode/instances", displayLinodes, filter);
	};

	// Click handler for attach button
	var handleAttach = function(event)
	{
		if (event.currentTarget.disabled)
			return;

		var req = {
			"linode_id": parseInt(ui.linode.value)
		};
		apiPost("/volumes/" + data.params.vid + "/attach", req, function(response)
		{
			location.href = "/linodes/dashboard?lid=" + response.linode_id;
		});
	};

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

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

		setupHeader();

		// Update links on page to include proper volume ID
		var anchors = document.getElementsByTagName("a");
		for (var i = 0; i < anchors.length; i++)
			anchors[i].href = anchors[i].href.replace("vid=0", "vid=" + data.params.vid);

		// Get element references
		ui.attachButton = document.getElementById(elements.attachButton);
		ui.label = document.getElementById(elements.label);
		ui.linode = document.getElementById(elements.linode);
		ui.volumeLabel = document.getElementById(elements.volumeLabel);

		// Attach event handlers
		ui.attachButton.addEventListener("click", handleAttach);

		// Get data from API
		apiGet("/volumes/" + data.params.vid, displayVolume, null);
	};

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