console.log("[+] Wow, JavaScript!");
import * as wasm from "rsp6-decoder";
import { BrowserAztecCodeReader } from '@zxing/library';

let stations = require("./stations.json");
let fares = require("./fares.json");
let discounts = require("./discounts.json");
window.stations = stations;
window.fares = fares;
window.discounts = discounts;
let loaded = false;

function onload() {
	if (loaded) {
		return;
	}
	loaded = true;
	console.log("[+] initialising wasm");
	window.wasm = wasm;
	window.wasm.init();
	let video_div = document.getElementById("video-container");
	let scan_button = document.getElementById("scan-button");
	let error_banner = document.getElementById("error-banner");
	let error_header = document.getElementById("error-header");
	let error_text = document.getElementById("error-text");
	let decode_banner = document.getElementById("decode-banner");
	let decode_reason = document.getElementById("decode-reason");
	let raw_barcode = document.getElementById("raw-barcode");
	let raw_barcode_wrapper = document.getElementById("raw-barcode-wrapper");
	let raw_json = document.getElementById("raw-json");
	let ticket_data = document.getElementById("ticket-data");
	let ticket_content = document.getElementById("ticket-content");
	let file_upload = document.getElementById("file-upload-1");
	const codeReader = new BrowserAztecCodeReader();
	console.log("[+] Looks like everything initialised fine!");
	document.getElementById('code-version').innerHTML = __COMMIT_HASH__;

	let selectedDeviceId;

	function error(header, text) {
		video_div.style.display = "none";
		error_header.innerHTML = header;
		error_text.innerHTML = text;
		error_banner.style.display = "block";
		error_banner.focus();
		error_banner.scrollIntoView();
	}

	function decodeError(text) {
		decode_banner.style.display = "block";
		decode_reason.innerHTML = text;
		decode_banner.scrollIntoView();
	}

	function row(k, v) {
		let tr = document.createElement("tr");
		tr.classList.add("govuk-table__row");
		let th = document.createElement("th");
		th.classList.add("govuk-table__header");
		th.scope = "row";
		let td = document.createElement("td");
		td.classList.add("govuk-table__cell");
		th.innerHTML = k;
		td.innerHTML = v;
		tr.appendChild(th);
		tr.appendChild(td);
		ticket_data.appendChild(tr);
	}

	function nlcify(nlc) {
		let data = stations[nlc];
		if (!data || !data.desc) {
			return nlc;
		}
		else {
			if (data.crs) {
				return data.crs;
			}
			else {
				return nlc;
			}
		}
	}

	function handleTicket(ticket) {
		window.ticket = ticket;
		video_div.style.display = "none";
		codeReader.reset();
		console.log("Got ticket: " + ticket);
		raw_barcode.innerHTML = ticket;
		raw_barcode_wrapper.style.display = "block";
		try {
			let result = window.wasm.decode_ticket(window.ticket);
			if (result["Err"]) {
				decodeError(result["Err"]);
			}
			else {
				let data = result["Ok"];
				raw_json.innerHTML = JSON.stringify(data, null, 2);
				ticket_data.innerHTML = "";
				document.getElementById("origin").innerHTML = nlcify(data.origin_nlc);
				document.getElementById("dest").innerHTML = nlcify(data.destination_nlc);
				let fare = fares[data.fare] || ("Unknown fare (" + data.fare + ")");
				let origin = stations[data.origin_nlc] ? stations[data.origin_nlc].desc : "NLC " + data.origin_nlc;
				let destination = stations[data.destination_nlc] ? stations[data.destination_nlc].desc : "NLC " + data.destination_nlc;
				let type = "";
				if (data.coupon_type == "Single") {
					type = "Single";
				}
				else if (data.coupon_type == "ReturnOutbound") {
					type = "Return (outbound)";
				}
				else if (data.coupon_type == "ReturnInbound") {
					type = "Return (inbound)";
				}
				else {
					type = "Season";
				}
				if (data.bidirectional) {
					type += " (bidirectional)";
				}
				let discount = null;
				let discount_name = null;
				if (data.discount_code) {
					if (discounts[data.discount_code]) {
						discount = discounts[data.discount_code].desc;
						if (discounts[data.discount_code].code) {
							discount_name = discounts[data.discount_code].code;
						}
					}
					else {
						discount = "Unknown discount (" + data.discount_code + ")";
					}
				}
				let adult = data.child_ticket ? "Child" : "Adult";
				let first = data.standard_class ? "Standard Class" : "First Class";
				document.getElementById("ticket-fromto").innerHTML = origin + " to " + destination;
				if (data.manually_inspect) {
					row("", "<i>Manual inspection required</i>");
				}
				let brfares_link = "https://www.brfares.com/!faredetail?orig=" + data.origin_nlc + "&dest=" + data.destination_nlc + "&tkt=" + data.fare;
				if (data.route_code && data.route_code != 0) {
					brfares_link += "&rte=" + data.route_code;
				}
				if (discount_name) {
					brfares_link += "&rlc=" + discount_name;
				}
				row("Fare", fare + "<br/><small><a class=\"govuk-link\" href=\"" + brfares_link + "\">View on brfares.com</a></small>");
				row("Class", adult + " " + first);
				if (discount) {
					row("Discount", discount);
				}
				row("Ticket type", type);
				row("Start date", data.start_date);
				if (data.depart_time_flag || data.depart_time != "00:00:00.0") {
					let extra = "";
					if (data.depart_time_flag == "Suggested") {
						extra = " (suggested)";
					}
					else if (data.depart_time_flag == "Specific") {
						extra = " (mandatory)";
					}
					row("Depart at", data.depart_time.substring(0, 5) + extra);
				}
				row("Ticket reference", data.issuer_id + data.ticket_reference);
				if (data.passenger_name) {
					row("Passenger name", data.passenger_name);
				}
				if (data.purchase_details) {
					let dov = data.purchase_details.days_of_validity;
					let maybe_s = "";
					if (dov > 1) {
						maybe_s = "s";
					}
					row("Valid for", dov + " day" + maybe_s);
				}
				if (data.limited_duration) {
					row("Limited duration", data.limited_duration);
				}
				row("Fare code", data.fare);
				if (data.purchase_details) {
					let price = data.purchase_details.price_pence;
					row("Price", "£" + Math.floor(price / 100) + "." + (price % 100).toString().padStart(2, "0"));
					row("Purchased", data.purchase_details.purchase_time.substring(0, 16));
					if (data.purchase_details.purchase_reference) {
						row("Purchase reference", data.purchase_details.purchase_reference);
					}
				}
				if (data.reservations.length > 0) {
					let out = "";
					data.reservations.forEach((resv) => {
						if (out != "") {
							out += "<br/>";
						}
						out += "<i>Train " + resv.retail_service_id + "</i></br>";
						if (resv.coach == "*" || (resv.seat_number == 0 && resv.coach == " ")) {
							out += "No specific seat";
						}
						else {
							if (!resv.coach || resv.coach == " ") {
								resv.coach = "?";
							}
							out += "Coach " + resv.coach + " Seat " + resv.seat_number + (resv.seat_letter ? resv.seat_letter : "");
						}
					});
					row("Reservations", out);
				}
				let retailer = stations[data.retailer_id] ? stations[data.retailer_id].desc : "???";
				row("Sold by", retailer + " (" + data.retailer_id + ")");
				if (data.route_code != 0) {
					row("Route code", data.route_code);
				}
				if (data.restriction_code) {
					row("Restriction", data.restriction_code);
				}
				if (data.discount_code != 0) {
					row("Discount code", (discount_name ? discount_name + " / " : "") + data.discount_code);
				}
				if (data.passenger_id) {
					row("Passenger ID", data.passenger_id);
				}
				row("Lennon code", data.lennon_ticket_type);
				row("Sequence number", data.sub_utn);
				ticket_content.style.display = "block";
				ticket_content.scrollIntoView();
			}
		}
		catch (e) {
			decodeError("exception: " + e);
		}
	}
	window.handleTicket = handleTicket;

	codeReader.getVideoInputDevices()
		.then((videoInputDevices) => {
			console.log("[+] Detected " + videoInputDevices.length + " video sources");
			if (videoInputDevices.length >= 1) {
				selectedDeviceId = videoInputDevices[0].deviceId;
				scan_button.removeAttribute("disabled");
			}
		})
		.catch((err) => {
			error("Scanner failed", "Couldn't figure out what cameras you have on your device.<br/><pre>" + err + "</pre>");
		});

	let epoch = 0;

	document.getElementById('scan-button').addEventListener('click', () => {
		let current_epoch = epoch + 1;
		epoch = current_epoch;
		decode_banner.style.display = "none";
		ticket_content.style.display = "none";
		codeReader.decodeFromInputVideoDevice(undefined, 'video').then((result) => {
			error_banner.style.display = "none";
			handleTicket(result);
		}).catch((err) => {
			if (epoch == current_epoch) {
				error("Scanner failed", "Looks like the barcode scanner failed in some way. If this keeps happening, try reloading the page or using one of the alternative options.<br/><pre>" + err + "</pre>");
				console.error(err);
			}
		});
		video_div.style.display = "block";
		console.log(`[+] Barcode scanner started on device ${selectedDeviceId}`);
	});
	document.getElementById('video').addEventListener('play', () => {
		console.log('[+] Video started playing');
		video_div.scrollIntoView();
	});
	document.getElementById('raw-text-form').addEventListener('submit', (e) => {
		e.preventDefault();
		console.log("[+] Raw text input pressed");
		decode_banner.style.display = "none";
		ticket_content.style.display = "none";
		let value = document.getElementById('raw-text-in').value;
		document.getElementById('text-details').removeAttribute('open');
		handleTicket(value);
	});
	file_upload.addEventListener('change', () => {
		if (file_upload.files.length > 0) {
			console.log('[+] File selected');
			const file = file_upload.files[0];
			const uri = window.URL.createObjectURL(file);
			console.log('[+] Scanning URL ' + uri);
			const img = document.createElement("img");
			img.src = uri;
			img.videoWidth = 0;
			let done = false;
			document.getElementById('image-sanctuary').innerHTML = '';
			document.getElementById('image-sanctuary').appendChild(img);
			decode_banner.style.display = "none";
			ticket_content.style.display = "none";
			codeReader.reset();
			setTimeout(() => {
				if (!done) {
					console.log("[+] Timed out!");
					codeReader.reset();
				}
			}, 750);
			codeReader.decodeFromImage(img).then((result) => {
				console.log("[+] Screenshot decode done!");
				done = true;
				document.getElementById('screenshot-details').removeAttribute('open');
				error_banner.style.display = "none";
				window.URL.revokeObjectURL(uri);
				handleTicket(result);
			}).catch((err) => {
				done = true;
				console.error(err);
				error("Barcode reader failed", "Couldn't detect a barcode in that screenshot. Try another image.<br/><pre>" + err + "</pre>");
				window.URL.revokeObjectURL(uri);
			});
		}
	});
}

if (document.readyState == 'complete') {
	console.log("[+] Loaded already!");
	onload();
}
else {
	window.addEventListener('load', onload);
}