let NfcAdapter;
let nfc;
let nfcCallback;
let NdefRecord;
let NdefMessage;
let nfcType = 'cardNo'
let nfcwriteText = ''

export function initNFC(callback) {
	if (uni.getSystemInfoSync().platform == 'android') {
		nfcCallback = callback;
		init();
	}
}

export function closeNFC() {
	nfcCallback = null;
	if (uni.getSystemInfoSync().platform == 'android') {
		close();
	}
}

export function setNfcType(e) {
	if (!['cardNo', 'write', 'read'].includes(e)) {
		showToast('类型不正确')
		return
	}
	nfcType = e
}

export function setNfcText(e) {
	nfcwriteText = e
}

function showToast(msg) {
	uni.showToast({
		title: msg,
		icon: 'none'
	})
}

function init() {
	try {
		let main = plus.android.runtimeMainActivity();
		let Intent = plus.android.importClass('android.content.Intent');
		let Activity = plus.android.importClass('android.app.Activity');
		let PendingIntent = plus.android.importClass('android.app.PendingIntent');
		let IntentFilter = plus.android.importClass('android.content.IntentFilter');
		NfcAdapter = plus.android.importClass('android.nfc.NfcAdapter');
		nfc = NfcAdapter.getDefaultAdapter(main);

		if (nfc == null) {
			uni.showToast({
				title: '设备不支持NFC！',
				icon: 'none'
			})
			return;
		}

		if (!nfc.isEnabled()) {
			uni.showToast({
				title: '请在系统设置中先启用NFC功能！',
				icon: 'none'
			});
			return;
		}

		let intent = new Intent(main, main.getClass());
		intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
		let pendingIntent = PendingIntent.getActivity(main, 0, intent, 0);
		let ndef = new IntentFilter("android.nfc.action.TECH_DISCOVERED");
		let tag = new IntentFilter('android.nfc.action.TAG_DISCOVERED');
		ndef.addDataType("*/*");
		let intentFiltersArray = [ndef, tag];
		let techListsArray = [
			["android.nfc.tech.MifareClassic"],
			["android.nfc.tech.MifareUltralight"]
		];
		plus.globalEvent.addEventListener("newintent",
			function() {
				readCardNo();
			}, false);
		plus.globalEvent.addEventListener("pause", function(e) {
			if (nfc) {
				nfc.disableForegroundDispatch(main);
			}
		}, false);
		plus.globalEvent.addEventListener("resume", function(e) {
			if (nfc) {
				nfc.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);
			}
		}, false);
		nfc.enableForegroundDispatch(main, pendingIntent, intentFiltersArray, techListsArray);
	} catch (e) {
		console.error(e);
	}
}

/**
 * 监听
 */
function readCardNo() {
	NdefRecord = plus.android.importClass("android.nfc.NdefRecord");
	NdefMessage = plus.android.importClass("android.nfc.NdefMessage");
	var main = plus.android.runtimeMainActivity();
	var intent = main.getIntent();
	if ("android.nfc.action.TECH_DISCOVERED" == intent.getAction()) {
		if (nfcType === 'cardNo') {
			__read_no(intent)
		} else if (nfcType === 'write') {
			__write(intent);
		} else {
			__read(intent);
		}
	}
}


/**
 * 写入内容
 */
function __write(intent) {
	if (!nfcwriteText) {
		showToast('写入内容不能为空')
		return
	}
	var text = nfcwriteText
	var textBytes = plus.android.invoke(text, "getBytes");
	var textRecord = new NdefRecord(NdefRecord.TNF_MIME_MEDIA,
		plus.android.invoke("text/plain", "getBytes"), plus.android.invoke("", "getBytes"), textBytes);
	var message = new NdefMessage([textRecord]);
	var Ndef = plus.android.importClass('android.nfc.tech.Ndef');
	var NdefFormatable = plus.android.importClass('android.nfc.tech.NdefFormatable');
	var tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
	var ndef = Ndef.get(tag);
	if (ndef != null) {
		var size = message.toByteArray().length;
		console.log("size=" + size);
		ndef.connect();
		if (!ndef.isWritable()) {
			nfcCallback({
				code: 500,
				data: {
					type: nfcType,
					text: text,
				},
				message: 'tag不允许写入'
			})
			return;
		}
		if (ndef.getMaxSize() < size) {
			nfcCallback({
				code: 500,
				data: {
					type: nfcType,
					text: text,
				},
				message: '文件大小超出容量'
			})
			return;
		}

		ndef.writeNdefMessage(message);
		nfcCallback({
			code: 200,
			data: {
				type: nfcType,
				text: text,
			},
			message: '写入成功'
		})
		return;
	} else {
		var format = NdefFormatable.get(tag);
		if (format != null) {
			try {
				format.connect();
				format.format(message);
				nfcCallback({
					code: 500,
					data: {
						type: nfcType,
						text: text,
					},
					message: '格式化tag并且写入message'
				})
				return;
			} catch (e) {
				nfcCallback({
					code: 500,
					data: {
						type: nfcType,
						text: text,
					},
					message: '格式化tag失败'
				})
				return;
			}
		} else {
			nfcCallback({
				code: 500,
				data: {
					type: nfcType,
					text: text,
				},
				message: 'Tag不支持NDEF'
			})
			return;
		}
	}
}
/**
 * 读取内容
 */
function __read(intent) {
	var Parcelable = plus.android.importClass("android.os.Parcelable");
	var rawmsgs = intent.getParcelableArrayExtra("android.nfc.extra.NDEF_MESSAGES");
	if (rawmsgs) {
		const records = rawmsgs[0].getRecords();
		var result = records[0].getPayload();
		var s = plus.android.newObject("java.lang.String", result);
		if (typeof s === 'string') {
			nfcCallback({
				code: 200,
				data: {
					type: nfcType,
					text: s,
				},
				message: '读取成功'
			})
		} else {
			nfcCallback({
				code: 500,
				data: {
					type: nfcType,
					text: s,
				},
				message: '数据为空'
			})
		}
	} else {
		nfcCallback({
			code: 500,
			data: {
				type: nfcType,
				text: '',
			},
			message: '数据为空'
		})
	}

}

/**
 * 读取卡号
 */
function __read_no(intent) {
	var content = "";
	var tag = plus.android.importClass("android.nfc.Tag");
	tag = intent.getParcelableExtra(NfcAdapter.EXTRA_TAG);
	var bytesId = intent.getByteArrayExtra(NfcAdapter.EXTRA_ID);
	content += "卡片字节数组ID：" +  tag.getId() + "<br/>";
	content += "卡片16进制ID：" + ab2hex(tag.getId()) + "<br/>";
	var tagid = ab2hex(tag.getId());
	content += "卡片16进制翻转ID：" + tagid + "<br/>";
	content += "卡片10进制卡号：" + parseInt(tagid, 16) + "<br/>";
	nfcCallback({
		code: 200,
		data: {
			type: nfcType,
			id: tagid,
			reverseTagId16: tagid,
			tagId16: ab2hex(tag.getId()),
			bytesIds: tag.getId()
		},
		message: '读取成功'
	})
	console.log(content)
}

function ab2hex(buffer) {
	const hexArr = Array.prototype.map.call(
		new Uint8Array(buffer),
		function(bit) {
			return ('00' + bit.toString(16)).slice(-2).toUpperCase();
		}
	)
	return hexArr.join('')
}

function close() {
	if (nfc) {
		let main = plus.android.runtimeMainActivity();
		nfc.disableForegroundDispatch(main);
	}
}