import AWSIoT
import CoreBluetooth

/// FreeRTOS device.
public class AmazonFreeRTOSDevice: NSObject {

    /// CBPeripheral.
    public var peripheral: CBPeripheral
    /// advertisementData.
    public var advertisementData: [String: Any]?
    /// rssi.
    public var RSSI: NSNumber?

    /// FreeRTOS device should auto reconnect on non-explicit disconnect.
    public var reconnect = false
    /// The certificateId used to connect. see: https://github.com/awslabs/aws-sdk-ios-samples/tree/master/IoT-Sample/Swift
    public var certificateId: String?
    /// The credentialsProvider used to connect like AWSMobileClient for Cognito.
    public var credentialsProvider: AWSCredentialsProvider?

    /// Afr Version of the device.
    public var afrVersion: String?
    /// The brokerEndpoint on the device.
    public var brokerEndpoint: String?
    /// The MTU of the device.
    public var mtu: Int?
    /// Afr Platform of the device.
    public var afrPlatform: String?
    /// Afr device id.
    public var afrDevId: String?

    /// The saved networks.
    public var savedNetworks: [ListNetworkResp] = []
    /// The scaned networks.
    public var scanedNetworks: [ListNetworkResp] = []

    // Used for LOT read.
    internal var txLotDatas: [String: Data] = [:]
    // Used for LOT write.
    internal var rxLotDataQueues: [String: [Data]] = [:]

    /// Initializes a new FreeRTOS device.
    ///
    /// - Parameter peripheral: The CBPeripheral.
    /// - Returns: A new FreeRTOS device.
    public init(peripheral: CBPeripheral) {
        self.peripheral = peripheral
        super.init()
    }

    // clear context of the device.
    internal func reset() {

        removeIoTDataManager()

        txLotDatas.removeAll()
        rxLotDataQueues.removeAll()

        afrVersion = nil
        brokerEndpoint = nil
        mtu = nil
        afrPlatform = nil
        afrDevId = nil

        savedNetworks.removeAll()
        scanedNetworks.removeAll()
    }

    // register the AWSIoTDataManager
    internal func registerIoTDataManager(connect: Connect) -> Bool {

        let brokerEndpointParts = connect.brokerEndpoint.split(separator: ".")
        guard let endpoint = AWSEndpoint(urlString: "https://\(connect.brokerEndpoint)"), brokerEndpointParts.count > 2, let serviceConfiguration = AWSServiceConfiguration(region: String(brokerEndpointParts[2]).aws_regionTypeValue(), endpoint: endpoint, credentialsProvider: credentialsProvider) else {
            return false
        }
        AWSIoTDataManager.register(with: serviceConfiguration, forKey: peripheral.identifier.uuidString)
        updateIoTDataManager()
        return true
    }

    // remove the AWSIoTDataManager
    internal func removeIoTDataManager() {
        AWSIoTDataManager(forKey: peripheral.identifier.uuidString).disconnect()
        AWSIoTDataManager.remove(forKey: peripheral.identifier.uuidString)

        txLotDatas.removeValue(forKey: AmazonFreeRTOSGattService.MqttProxy.uuidString)
        rxLotDataQueues.removeValue(forKey: AmazonFreeRTOSGattService.MqttProxy.uuidString)
    }

    // update the metadata of the AWSIoTDataManager
    internal func updateIoTDataManager() {
        var userMetaData = ["AFRSDK": "iOS", "AFRSDKVersion": AmazonFreeRTOS.SDKVersion]
        if let afrVersion = afrVersion, !afrVersion.isEmpty {
            userMetaData["AFRLibVersion"] = afrVersion
        }
        if let afrPlatform = afrPlatform, !afrPlatform.isEmpty {
            userMetaData["Platform"] = afrPlatform
        }
        if let afrDevId = afrDevId, !afrDevId.isEmpty {
            userMetaData["AFRDevID"] = afrDevId
        }
        AWSIoTDataManager(forKey: peripheral.identifier.uuidString).updateUserMetaData(userMetaData)
    }
}

extension AmazonFreeRTOSDevice {

    /// Connect to the FreeRTOS device.
    /// - Parameters:
    ///    - reconnect: FreeRTOS device should auto reconnect on non-explicit disconnect.
    ///    - certificateId: The certificateId used to connect. see: https://github.com/awslabs/aws-sdk-ios-samples/tree/master/IoT-Sample/Swift
    ///    - credentialsProvider: The credentialsProvider used to connect like AWSMobileClient for Cognito.
    /// - Precondition: central is ready and device must be disconnected, otherwise it will be ignored.
    public func connect(reconnect: Bool, certificateId: String? = nil, credentialsProvider: AWSCredentialsProvider? = nil) {
        self.reconnect = reconnect
        self.certificateId = certificateId
        self.credentialsProvider = credentialsProvider
        if peripheral.state == .disconnected {
            AmazonFreeRTOSManager.shared.central?.connect(peripheral, options: nil)
        }
    }

    /// Disconnect from the FreeRTOS device.
    ///
    /// - Precondition: central is ready and device must be connected, otherwise it will be ignored.
    public func disconnect() {
        reconnect = false
        if peripheral.state == .connected {
            AmazonFreeRTOSManager.shared.central?.cancelPeripheralConnection(peripheral)
        }
    }
}

// Device Info Service

extension AmazonFreeRTOSDevice {

    /// Get afrVersion of the FreeRTOS device.
    public func getAfrVersion() {

        AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)] ↓ get afrVersion")

        guard let characteristic = peripheral.serviceOf(uuid: AmazonFreeRTOSGattService.DeviceInfo)?.characteristicOf(uuid: AmazonFreeRTOSGattCharacteristic.AfrVersion) else {
            AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)][ERROR] DeviceInfo service or AfrVersion characteristic doesn't exist")
            return
        }
        peripheral.readValue(for: characteristic)
    }

    /// Get mqtt broker endpoint of the FreeRTOS device.
    public func getBrokerEndpoint() {

        AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)] ↓ get brokerEndpoint")

        guard let characteristic = peripheral.serviceOf(uuid: AmazonFreeRTOSGattService.DeviceInfo)?.characteristicOf(uuid: AmazonFreeRTOSGattCharacteristic.BrokerEndpoint) else {
            AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)][ERROR] DeviceInfo service or BrokerEndpoint characteristic doesn't exist")
            return
        }
        peripheral.readValue(for: characteristic)
    }

    /// Get BLE mtu of the FreeRTOS device.
    public func getMtu() {

        AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)] ↓ get mtu")

        guard let characteristic = peripheral.serviceOf(uuid: AmazonFreeRTOSGattService.DeviceInfo)?.characteristicOf(uuid: AmazonFreeRTOSGattCharacteristic.Mtu) else {
            AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)][ERROR] DeviceInfo service or Mtu characteristic doesn't exist")
            return
        }
        peripheral.readValue(for: characteristic)
    }

    /// Get afrPlatform of the FreeRTOS device.
    public func getAfrPlatform() {

        AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)] ↓ get afrPlatform")

        guard let characteristic = peripheral.serviceOf(uuid: AmazonFreeRTOSGattService.DeviceInfo)?.characteristicOf(uuid: AmazonFreeRTOSGattCharacteristic.AfrPlatform) else {
            AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)][ERROR] DeviceInfo service or AfrPlatform characteristic doesn't exist")
            return
        }
        peripheral.readValue(for: characteristic)
    }

    /// Get afrDevId of the FreeRTOS device.
    public func getAfrDevId() {

        AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)] ↓ get afrDevId")

        guard let characteristic = peripheral.serviceOf(uuid: AmazonFreeRTOSGattService.DeviceInfo)?.characteristicOf(uuid: AmazonFreeRTOSGattCharacteristic.AfrDevId) else {
            AmazonFreeRTOSManager.shared.debugPrint("[\(peripheral.identifier.uuidString)][ERROR] DeviceInfo service or AfrDevId characteristic doesn't exist")
            return
        }
        peripheral.readValue(for: characteristic)
    }
}

// Network Config Service

extension AmazonFreeRTOSDevice {

    /// List saved and scanned wifi networks of device. Wifi networks are returned one by one, saved wifi ordered by priority and scanned wifi ordered by signal strength (rssi).
    ///
    /// - Parameter listNetworkReq: The list network request.
    public func listNetwork(_ listNetworkReq: ListNetworkReq) {

        // reset networks list for the peripheral

        savedNetworks.removeAll()
        scanedNetworks.removeAll()

        AmazonFreeRTOSManager.shared.listNetwork(peripheral, listNetworkReq: listNetworkReq)
    }

    /// Save wifi network to device.
    ///
    /// - Parameter saveNetworkReq: The save network request.
    public func saveNetwork(_ saveNetworkReq: SaveNetworkReq) {
        AmazonFreeRTOSManager.shared.saveNetwork(peripheral, saveNetworkReq: saveNetworkReq)
    }

    /// Edit wifi network of device. Currently only support priority change.
    ///
    /// - Parameter editNetworkReq: The edit network request.
    public func editNetwork(_ editNetworkReq: EditNetworkReq) {
        AmazonFreeRTOSManager.shared.editNetwork(peripheral, editNetworkReq: editNetworkReq)
    }

    /// Delete saved wifi network from device.
    ///
    /// - Parameter deleteNetworkReq: The delete network request.
    public func deleteNetwork(_ deleteNetworkReq: DeleteNetworkReq) {
        AmazonFreeRTOSManager.shared.deleteNetwork(peripheral, deleteNetworkReq: deleteNetworkReq)
    }
}