var config = require("./NFCConfig");
var successCode = config.nfcSuccessCode();
var errorCode = config.nfcErrorCode();
var nfcAdapter = null;
var isoDep = null;
var isFirst = false;

export function startScanNfcDevice(callBack) {
	isFirst = false;
	initNfcAdapter(function(res) {
		if (res.code == successCode) {
			console.log('初始化NFC适配器实例成功', res)
			//注册贴卡监听回调
			nfcAdapter.onDiscovered(function(res) {
				console.log('监听回调到卡片了', res);
				if (!isFirst) {
					if (res.techs.includes(nfcAdapter.tech.isoDep)) { //获取isoDep实例
						console.log('发现' + nfcAdapter.tech.isoDep + '卡');
						isoDep = nfcAdapter.getIsoDep();
						isFirst = true;
						callBack.call(this, {
							code: successCode,
							msg: "搜索卡片成功",
							data: isoDep
						})
					}
				}
			});
			//开始监听贴卡
			nfcAdapter.startDiscovery({
				success: function(res) {
					console.log('监听贴卡成功', res)
				},
				fail: function(err) {
					console.log('监听贴卡失败', err)
					var msg = "";
					if (err) {
						msg = nfcErrMsg(err.errCode)
					}
					callBack.call(this, {
						code: errorCode,
						msg: msg,
						data: null
					})
				},
			})
		} else {
			//初始化NFC实例失败
			callBack.call(this, res)
		}
	})
};

export function onDiscovered(callBack) {
	//注册贴卡监听回调
	nfcAdapter.onDiscovered(discoverHandler);
}
export function offDiscovered(callBack) {
	//注册贴卡监听回调
	nfcAdapter.offDiscovered(discoverHandler);
}

function discoverHandler(res, callBack) {
	if (res.techs.includes(nfcAdapter.tech.isoDep)) { //获取isoDep实例
		console.log('发现' + nfcAdapter.tech.isoDep + '卡');
		isoDep = nfcAdapter.getIsoDep();
		callBack.call(this, {
			code: successCode,
			msg: "搜索卡片成功",
			data: isoDep
		})
	}
}
export function startDiscovery(callBack) {
	//开始监听贴卡
	nfcAdapter.startDiscovery({
		success: function(res) {
			console.log('监听贴卡成功', res)
		},
		fail: function(err) {
			console.log('监听贴卡失败', err)
			var msg = "";
			if (err) {
				msg = nfcErrMsg(err.errCode)
			}
			callBack.call(this, {
				code: errorCode,
				msg: msg,
				data: null
			})
		}
	})
}

export function stopScanNfcDevice(callBack) {
	if (nfcAdapter != null) {
		nfcAdapter.stopDiscovery({
			success: function(res) {
				callBack.call(this, {
					code: successCode,
					msg: "停止扫描成功",
					data: null
				})
			},
			fail: function(err) {
				var msg = "";
				if (err) {
					msg = nfcErrMsg(err.errCode)
				}
				callBack.call(this, {
					code: errorCode,
					msg: msg,
					data: null
				})
			}
		})
	} else {
		callBack.call(this, {
			code: successCode,
			msg: "暂无NFC适配器实例",
			data: null
		})
	}
};
export function connectDevice(callBack) {
	if (isoDep != null) {
		isoDep.connect({
			success: function(res) {
				console.log('连接卡片成功', res)
				callBack.call(this, {
					code: successCode,
					msg: "连接卡片成功",
					data: null
				})
			},
			fail: function(err) {
				var msg = "";
				if (err) {
					msg = nfcErrMsg(err.errCode)
				}
				console.log("链接卡片失败：", err.errCode)
				callBack.call(this, {
					code: errorCode,
					msg: msg,
					data: null
				})
			}
		})
	} else {
		callBack.call(this, {
			code: errorCode,
			msg: "连接卡片不存在",
			data: null
		})
	}
};
export function disConnectDevice(callBack) {
	if (isoDep != null) {
		isoDep.close({
			success: function(res) {
				callBack.call(this, {
					code: successCode,
					msg: "断开卡片成功",
					data: null
				})
			},
			fail: function(err) {
				var msg = "";
				if (err) {
					msg = nfcErrMsg(err.errCode)
				}
				callBack.call(this, {
					code: errorCode,
					msg: msg,
					data: null
				})
			}
		})
	} else {
		callBack.call(this, {
			code: successCode,
			msg: "暂无连接卡片",
			data: null
		})
	}
};
export function sendMessageToDevice(cmdArr, callBack) {
	if (cmdArr.length <= 0) {
		callBack.call(this, {
			code: errorCode,
			msg: "发送数据不能为空",
			data: null
		})
		return
	}
	var resultCmdArr = [];
	for (var i = 0; i < cmdArr.length; i++) {
		var sendbuf = hexStringToArrayBuffer(cmdArr[i]);
		isoDep.transceive({
			data: sendbuf,
			success: function(res) {
				var resultCmd = arrayBufferToHexString(res.data);
				resultCmdArr.push(resultCmd);
				if (resultCmdArr.length == cmdArr.length) {
					callBack.call(this, {
						code: successCode,
						msg: "发送数据成功",
						data: resultCmdArr
					})
				}
			},
			fail: function(err) {
				if (i == 0) {
					console.log('发送数据失败', err);
					var msg = "";
					if (err) {
						msg = nfcErrMsg(err.errCode)
					}
					callBack.call(this, {
						code: errorCode,
						msg: msg,
						data: null
					})
					return
				}
			}
		});
	}
};
export function removeObj() {
	isoDep = null;
	nfcAdapter = null;
}


function initNfcAdapter(callBack) {
	nfcAdapter = wx.getNFCAdapter() //获取NFC适配器实例
	console.log("获取NFC适配器实例:", nfcAdapter);
	if (nfcAdapter != null) {
		callBack.call(this, {
			code: successCode,
			msg: "初始化NFC适配器实例成功",
			data: null
		})
	} else {
		callBack.call(this, {
			code: errorCode,
			msg: "初始化NFC适配器实例失败",
			data: null
		})
	}
};

//十六进制字符串转字节数组
function hexStringToArrayBuffer(str) {
	var hex = str;
	return new Uint8Array(hex.match(/[\da-f]{2}/gi).map(function(h) {
		return parseInt(h, 16)
	})).buffer;
};

//字节数组转十六进制字符串
function arrayBufferToHexString(buffer) {
	return Array.prototype.map.call(new Uint8Array(buffer), x => ('00' +
		x.toString(16)).slice(-2)).join('');
};

function nfcErrMsg(errCode) {
	switch (errCode) {
		case 0:
			return "正常";
			break;
		case 13000:
			return "设备不支持NFC";
			break;
		case 13001:
			return "系统NFC开关未打开";
			break;
		case 13010:
			return "未知错误";
			break;
		case 13019:
			return "用户未授权";
			break;
		case 13011:
			return "参数无效";
			break;
		case 13012:
			return "将参数解析为NdefMessage失败";
			break;
		case 13021:
			return "已经开始NFC扫描";
			break;
		case 13018:
			return "尝试在未开始NFC扫描时停止NFC扫描";
			break;
		case 13022:
			return "标签已经连接";
			break;
		case 13023:
			return "尝试在未连接标签时断开连接";
			break;
		case 13013:
			return "未扫描到NFC标签";
			break;
		case 13014:
			return "无效的标签技术";
			break;
		case 13015:
			return "从标签上获取对应技术失败";
			break;
		case 13024:
			return "当前标签技术不支持该功能";
			break
		case 13017:
			return "相关读写操作失败";
			break
		default:
			return "连接失败";
			break
	}
}