/*
 * 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.cost = "cost";
	elements.doIt = "doit";
	elements.linodeCount = "linode-count";
	elements.subnav = "subnav-link";
	elements.subnavActive = "subnav-link-active";

	// Data received from API calls
	var data = {};
	data.linodes = [];
	data.plans = {};

	// Static references to UI elements
	var ui = {};
	ui.cost = {};
	ui.dotIt = {};
	ui.linodeCount = [];

	// Temporary state
	var state = {};
	state.haveLinodes = false;
	state.havePlans = false;
	state.numResponses = 0;
	state.numRequests = 0;

	// Computes and displays the total monthly cost
	var displayCost = function()
	{
		var cost = 0;
		var haveAll = true;
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].backups.enabled)
				continue;

			if (!data.plans[data.linodes[i].type]) {
				haveAll = false;
				apiGet("/linode/types/" + data.linodes[i].type, function(response)
				{
					data.plans[response.id] = response;
					displayCost();
				}, null);
				continue;
			}

			cost += data.plans[data.linodes[i].type].addons.backups.price.monthly;
		}

		if (haveAll) {
			ui.cost.innerHTML = cost.toFixed(2);
			ui.doIt.disabled = false;
		}
	};

	// Callback for linodes API call
	var displayLinodes = function(response)
	{
		data.linodes = data.linodes.concat(response.data);

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

		state.haveLinodes = true;

		// Display count of linodes without backups
		var count = 0;
		for (var i = 0; i < data.linodes.length; i++) {
			if (!data.linodes[i].backups.enabled)
				count++;
		}

		// If there are no linodes without backups, go back
		if (!count)
			location.href = "/account/settings";

		for (var i = 0; i < ui.linodeCount.length; i++)
			ui.linodeCount[i].innerHTML = count;

		if (state.havePlans)
			displayCost();
	};

	// Callback for plans API call
	var displayPlans = function(response)
	{
		for (var i = 0; i < response.data.length; i++)
			data.plans[response.data[i].id] = response.data[i];

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

		state.havePlans = true;

		if (state.haveLinode)
			displayCost();
	};

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

		// Enable backups for each linode without backups
		for (var i = 0; i < data.linodes.length; i++) {
			if (data.linodes[i].backups.enabled)
				continue;

			state.numRequests++;
			apiPost("/linode/instances/" + data.linodes[i].id + "/backups/enable", {}, function(response)
			{
				state.numResponses++;
				if (state.numResponses >= state.numRequests)
					location.href = "/account/settings";
			});
		}

		ui.doIt.disabled = true;
	};

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

		setupHeader();

		// Highlight the account settings subnav link
		var subnavLinks = document.getElementsByClassName(elements.subnav);
		for (var i = 0; i < subnavLinks.length; i++) {
			if (subnavLinks[i].pathname == "/account/settings")
				subnavLinks[i].className = elements.subnav + " " + elements.subnavActive;
			else
				subnavLinks[i].className = elements.subnav;
		}

		// Get element references
		ui.cost = document.getElementById(elements.cost);
		ui.doIt = document.getElementById(elements.doIt);
		ui.linodeCount = document.getElementsByClassName(elements.linodeCount);

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

		// Get data from the API
		apiGet("/linode/instances", displayLinodes, null);
		apiGet("/linode/types", displayPlans, null);
	};

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