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

(function()
{
	// Element names specific to this page
	elements.addButton = "add-button";
	elements.attachment = "attachment";
	elements.label = "label";
	elements.location = "location";
	elements.size = "size";

	// Data recieved from API calls
	var data = {};
	data.linodes = [];
	data.regions = [];

	// Static references to UI elements
	var ui = {};
	ui.addButton = {};
	ui.attachment = {};
	ui.label = {};
	ui.location = {};
	ui.size = {};

	// 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
		var filter = {
			"+or": []
		};
		for (var i = 0; i < data.regions.length; i++)
			filter["+or"].push({"region": data.regions[i].id});
		if (response.page != response.pages) {
			apiGet("/linode/instances?page=" + (response.page + 1), displayLinodes, filter);
			return;
		}

		// Add linodes to selector
		for (var i = 0; i < data.linodes.length; i++) {
			var linode = document.createElement("option");
			linode.value = data.linodes[i].id;
			linode.innerHTML = data.linodes[i].label;
			ui.attachment.appendChild(linode);
			if (data.params.lid && parseInt(data.params.lid) == data.linodes[i].id) {
				ui.attachment.value = data.linodes[i].id;
				ui.location.value = data.linodes[i].region;
			}
		}

		ui.addButton.disabled = false;
	};

	// Callback for regions API call
	var displayRegions = function(response)
	{
		// Add regions that support block storage to array
		for (var i = 0; i < response.data.length; i++) {
			if (response.data[i].capabilities.includes("Block Storage"))
				data.regions.push(response.data[i]);
		}

		// Request the next page if there are more pages
		if (response.page != response.pages) {
			apiGet("/regions?page=" + (response.page + 1), displayRegions, null);
			return;
		}

		// Add regions to selector
		for (var i = 0; i < data.regions.length; i++) {
			var loc = document.createElement("option");
			loc.value = data.regions[i].id;
			if (regionNames[data.regions[i].id])
				loc.innerHTML = regionNames[data.regions[i].id];
			else
				loc.innerHTML = data.regions[i].id;
			ui.location.appendChild(loc);
		}

		// Request linodes in all the supported regions
		var filter = {
			"+or": []
		};
		for (var i = 0; i < data.regions.length; i++)
			filter["+or"].push({"region": data.regions[i].id});
		apiGet("/linode/instances", displayLinodes, filter);
	};

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

		if (ui.location.value == "0") {
			alert("You must select a location.");
			return;
		}

		var req = {
			"label": ui.label.value,
			"size": parseInt(ui.size.value),
			"region": ui.location.value
		};
		if (ui.attachment.value != "0")
			req.linode_id = parseInt(ui.attachment.value);

		apiPost("/volumes", req, function(response)
		{
			location.href = "/volumes/settings?vid=" + response.id;
		});
	};

	// Linode select handler
	var handleLinode = function(event)
	{
		// Set the location to the selected linode's region
		var linode = null;
		var lid = parseInt(ui.attachment.value);
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].id == lid) {
				linode = data.linodes[i];
				break;
			}
		}

		if (!linode)
			return;

		ui.location.value = linode.region;
	};

	// Location select handler
	var handleLocation = function(event)
	{
		// Clear the linode selector
		for (var i = ui.attachment.children.length - 1; i >= 1; i--)
			ui.attachment.children[i].remove();

		// Insert linodes in the same region
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].region != ui.location.value)
				continue;

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

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

		setupHeader();

		// Get element references
		ui.addButton = document.getElementById(elements.addButton);
		ui.attachment = document.getElementById(elements.attachment);
		ui.label = document.getElementById(elements.label);
		ui.location = document.getElementById(elements.location);
		ui.size = document.getElementById(elements.size);

		// Attach event handlers
		ui.addButton.addEventListener("click", handleAdd);
		ui.attachment.addEventListener("input", handleLinode);
		ui.location.addEventListener("input", handleLocation);

		// Get data from API
		apiGet("/regions", displayRegions, null);
	};

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