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

(function()
{
	// Element names specific to this page
	elements.balance = "balance";
	elements.balanceNegative = "balance-negative";
	elements.billingTable = "billing-table";
	elements.lmcRow = "lmc-tr1";
	elements.lmcRowAlt = "lmc-tr2";
	elements.loading = "loading";

	// Data received from API calls
	var data = {};
	data.invoices = [];
	data.payments = [];

	// Static references to UI elements
	var ui = {};
	ui.balance = {};
	ui.billingTable = {};
	ui.loading = {};

	// Temporary state
	var state = {};
	state.haveInvoices = false;
	state.havePayments = false;

	// Creates a row for the billing table
	var createBillingRow = function(item, alt)
	{
		var row = document.createElement("tr");
		if (alt)
			row.className = elements.lmcRowAlt;
		else
			row.className = elements.lmcRow;

		var dateCell = document.createElement("td");
		var date = new Date(item.date + "Z");
		dateCell.innerHTML = date.toLocaleDateString();
		row.appendChild(dateCell);

		var description = document.createElement("td");
		var amount = document.createElement("td");

		if (item.year) {
			// Yearly payment report
			var span1 = document.createElement("span");
			span1.innerHTML = "Yearly Payments Report (";
			var link = document.createElement("a");
			link.href = "/account/paymentreceiptyear?year=" + item.year;
			link.innerHTML = item.year;
			var span2 = document.createElement("span");
			span2.innerHTML = ")";
			description.appendChild(span1);
			description.appendChild(link);
			description.appendChild(span2);
		} else if (item.label) {
			// Invoice
			var link = document.createElement("a");
			link.href = "/account/invoice?iid=" + item.id;
			link.innerHTML = item.label;
			description.appendChild(link);

			if (item.total < 0)
				amount.innerHTML = "($" + (-item.total).toFixed(2) + ")";
			else
				amount.innerHTML = "$" + item.total.toFixed(2);
		} else {
			// Payment
			var link = document.createElement("a");
			link.href = "/account/paymentreceipt?pid=" + item.id;
			link.innerHTML = "Payment";
			var thanks = document.createElement("span");
			thanks.innerHTML = " - Thank you";
			description.appendChild(link);
			description.appendChild(thanks);

			if (item.usd > 0)
				amount.innerHTML = "($" + item.usd.toFixed(2) + ")";
			else
				amount.innerHTML = "$" + (-item.usd).toFixed(2);
		}

		row.appendChild(description);
		row.appendChild(amount);

		return row;
	};

	// Populate billing table with invoices and payments
	var displayAll = function()
	{
		// Remove loading row
		ui.loading.remove();

		// Combine to single array
		var combined = data.invoices.concat(data.payments);

		// Insert yearly payment reports
		var now = new Date();
		var lowestYear = now.getFullYear();
		for (var i = 0; i < combined.length; i++) {
			var date = new Date(combined[i].date + "Z");
			if (date.getFullYear() < lowestYear)
				lowestYear = date.getFullYear();
		}
		for (var i = now.getFullYear(); i >= lowestYear; i--) {
			combined.push({
				"date": i + "-01-01T12:00:00",
				"year": i
			});
		}

		// Sort
		combined.sort(function(a, b)
		{
			var aDate = new Date(a.date + "Z");
			var bDate = new Date(b.date + "Z");
			return bDate - aDate;
		});

		// Insert
		for (var i = 0; i < combined.length; i++)
			ui.billingTable.appendChild(createBillingRow(combined[i], ui.billingTable.children.length % 2));
	};

	// Callback for account details API call
	var displayBalance = function(response)
	{
		ui.balance.innerHTML = "$" + response.balance.toFixed(2);
		if (response.balance < 0) {
			ui.balance.innerHTML += " credit";
		} else if (response.balance > 0) {
			ui.balance.innerHTML += " outstanding";
			ui.balance.className = elements.balanceNegative;
		}
	};

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

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

		state.haveInvoices = true;
		if (state.havePayments)
			displayAll();
	};

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

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

		state.havePayments = true;
		if (state.haveInvoices)
			displayAll();
	};

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

		setupHeader();

		// Get element references
		ui.balance = document.getElementById(elements.balance);
		ui.billingTable = document.getElementById(elements.billingTable);
		ui.loading = document.getElementById(elements.loading);

		// Get data from API
		apiGet("/account", displayBalance, null);
		apiGet("/account/invoices", displayInvoices, null);
		apiGet("/account/payments", displayPayments, null);
	};

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