/*
 * 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.invoiceBody = "invoice-body";
	elements.invoiceID = "invoice-id";
	elements.lmcRow = "lmc-tr1";
	elements.lmcRowAlt = "lmc-tr2";
	elements.subnav = "subnav-link";
	elements.subnavActive = "subnav-link-active";
	elements.subtotal = "subtotal";
	elements.tax = "tax";
	elements.total = "total";

	// Data received from API calls
	var data = {};

	// Static references to UI elements
	var ui = {};
	ui.invoiceBody = {};
	ui.invoiceID = {};
	ui.subtotal = {};
	ui.tax = {};
	ui.total = {};

	// Generates an invoice item table row
	var createItemRow = function(item, alt)
	{
		var row = document.createElement("tr");
		if (alt)
			row.className = elements.lmcRowAlt;
		else
			row.className = elements.lmcRow;

		var description = document.createElement("td");
		description.innerHTML = item.label;
		row.appendChild(description);

		var from = document.createElement("td");
		var fromDate = new Date(item.from + "Z");
		from.innerHTML = fromDate.toLocaleString();
		row.appendChild(from);

		var to = document.createElement("td");
		var toDate = new Date(item.to + "Z");
		to.innerHTML = toDate.toLocaleString();
		row.appendChild(to);

		var quantity = document.createElement("td");
		quantity.innerHTML = item.quantity;
		row.appendChild(quantity);

		var unitPrice = document.createElement("td");
		unitPrice.innerHTML = "$" + parseFloat(item.unit_price).toFixed(4);
		row.appendChild(unitPrice);

		var subtotal = document.createElement("td");
		subtotal.innerHTML = "$" + item.amount.toFixed(2);
		row.appendChild(subtotal);

		var tax = document.createElement("td");
		tax.innerHTML = "$" + item.tax.toFixed(2);
		row.appendChild(tax);

		var total = document.createElement("td");
		total.innerHTML = "$" + item.total.toFixed(2);
		row.appendChild(total);

		return row;
	};

	// Callback for invoice API call
	var displayInvoice = function(response)
	{
		ui.subtotal.innerHTML = "$" + response.subtotal.toFixed(2);
		for (var i = 0; i < response.tax_summary.length; i++) {
			var taxRow = document.createElement("tr");
			var taxText = document.createElement("td");
			taxText.innerHTML = response.tax_summary[i].name + ":";
			var tax = document.createElement("td");
			tax.innerHTML = "$" + response.tax_summary[i].tax.toFixed(2);
			taxRow.appendChild(taxText);
			taxRow.appendChild(tax);
			ui.tax.parentNode.parentNode.insertBefore(taxRow, ui.tax.parentNode);
		}
		ui.tax.innerHTML = "$" + response.tax.toFixed(2);
		ui.total.innerHTML = "$" + response.total.toFixed(2);
	};

	// Callback for invoice items API call
	var displayItems = function(response)
	{
		// Insert invoice items into table
		for (var i = 0; i < response.data.length; i++)
			ui.invoiceBody.appendChild(createItemRow(response.data[i], ui.invoiceBody.children.length % 2));

		// Request the next page if there are more
		if (response.page != response.pages)
			apiGet("/account/invoices/" + data.params.iid + "/items?page=" + (response.page + 1), displayItems, null);
	};

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

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

		setupHeader();

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

		// Get element references
		ui.invoiceBody = document.getElementById(elements.invoiceBody);
		ui.invoiceID = document.getElementById(elements.invoiceID);
		ui.subtotal = document.getElementById(elements.subtotal);
		ui.tax = document.getElementById(elements.tax);
		ui.total = document.getElementById(elements.total);

		// Set title and table header
		document.title += " " + data.params.iid;
		ui.invoiceID.innerHTML = data.params.iid;

		// Get data from API
		apiGet("/account/invoices/" + data.params.iid, displayInvoice, null);
		apiGet("/account/invoices/" + data.params.iid + "/items", displayItems, null);
	};

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