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

(function()
{
	// Element names specific to this page
	elements.attached = "attached";
	elements.attachment = "attachment";
	elements.label = "label";
	elements.linodeLabel = "linode-label";
	elements.location = "location";
	elements.path = "path";
	elements.saveButton = "save-button";
	elements.size = "size";
	elements.status = "status";
	elements.volumeLabel = "volume-label";

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

	// Static references to UI elements
	var ui = {};
	ui.attached = {};
	ui.attachment = {};
	ui.label = {};
	ui.linodeLabel = {};
	ui.location = {};
	ui.path = {};
	ui.saveButton = {};
	ui.size = {};
	ui.status = {};
	ui.volumeLabel = {};

	// Temporary state
	var state = {};
	state.redirect = "/volumes";
	state.requests = 0;
	state.returns = 0;

	// Callback for attached linode API call
	var displayLinode = function(response)
	{
		ui.linodeLabel.innerHTML = response.label;
	};

	// 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.attachment.appendChild(linode);
			if (data.volume.linode_id && data.volume.linode_id == response.data[i].id)
				ui.attachment.value = response.data[i].id;
		}

		// 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;
		}
	};

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

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

		// Fill in details
		ui.label.value = data.volume.label;
		ui.status.innerHTML = data.volume.status;
		ui.size.value = data.volume.size;
		ui.size.min = data.volume.size;
		if (regionNames[data.volume.region])
			ui.location.innerHTML = regionNames[data.volume.region];
		else
			ui.location.innerHTML = data.volume.region;
		ui.path.innerHTML = data.volume.filesystem_path;

		if (data.volume.linode_id) {
			ui.attachment.style.display = "none";
			ui.attached.style.display = "initial";
			ui.linodeLabel.href = "/linodes/dashboard?lid=" + data.volume.linode_id;
			apiGet("/linode/instances/" + data.volume.linode_id, displayLinode, null);
		} else {
			// Get linodes in the same DC
			var filter = {
				"region": data.volume.region
			};
			apiGet("/linode/instances", displayLinodes, filter);
		}

		ui.saveButton.disabled = false;
	};

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

		state.requests = 0;
		state.returns = 0;

		// Common callback
		var callback = function(response)
		{
			state.returns++;
			if (state.returns >= state.requests)
				location.href = state.redirect;
		};

		// Attach request
		if (!data.volume.linode_id && ui.attachment.value != "0") {
			state.requests++;
			state.redirect = "/linodes/dashboard?lid=" + ui.attachment.value;
			var attachReq = {
				"linode_id": parseInt(ui.attachment.value)
			};
			apiPost("/volumes/" + data.params.vid + "/attach", attachReq, callback);
		}

		// Label change request
		if (ui.label.value != data.volume.label) {
			state.requests++;
			var labelReq = {
				"label": ui.label.value
			};
			apiPut("/volumes/" + data.params.vid, labelReq, callback);
		}

		// Size change
		var size = parseInt(ui.size.value);
		if (size > data.volume.size) {
			state.requests++;
			var sizeReq = {
				"size": size
			};
			apiPost("/volumes/" + data.params.vid + "/resize", sizeReq, callback);
		}
	};

	// 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.attached = document.getElementById(elements.attached);
		ui.attachment = document.getElementById(elements.attachment);
		ui.label = document.getElementById(elements.label);
		ui.linodeLabel = document.getElementById(elements.linodeLabel);
		ui.location = document.getElementById(elements.location);
		ui.path = document.getElementById(elements.path);
		ui.saveButton = document.getElementById(elements.saveButton);
		ui.size = document.getElementById(elements.size);
		ui.status = document.getElementById(elements.status);
		ui.volumeLabel = document.getElementById(elements.volumeLabel);

		// Attach event handlers
		ui.saveButton.addEventListener("click", handleSave);

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

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