class AddPaymentListActivity : AppCompatActivity(R.layout.activity_add_card) {
    private val addPaymentViewModel : AddPaymentViewModel = ...
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        addPaymentViewModel.checkPaymentStatusLiveData.observer(this) { isSuccess ->
            // 從后臺結(jié)果判斷是否添加成功
            if (isSuccess) {
                addCardSuccess(paymentType)
            } else {
                addCardFailed(paymentType)
            }
        }
    }
    private fun clickItem(paymentType: PaymentType) {
        when (paymentType) {
            PaymentType.ADD_GOOGLE_PAY -> //執(zhí)行添加谷歌支付流程
            PaymentType.ADD_PAY_PEL-> //執(zhí)行添加PayPel支付流程
            PaymentType.ADD_ALI_PAY-> //執(zhí)行添加支付寶支付流程
            PaymentType.ADD_STRIPE-> //執(zhí)行添加Stripe支付流程
        }
    }
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        when (resultCode) {
            PaymentType.ADD_GOOGLE_PAY -> {
                // 根據(jù)第三方回調(diào)的結(jié)果，拿到key
                // 根據(jù)key調(diào)用后臺的Api接口查詢是否添加成功
            }
            PaymentType.ADD_PAY_PEL -> // 同上
            // ...
        }
    }
    private fun addCardSuccess(paymentType: PaymentType){
        when (paymentType) {
            PaymentType.ADD_GOOGLE_PAY -> // 添加對應(yīng)的支付方式成功，展示成功的ui，然后執(zhí)行下一步操作
            PaymentType.ADD_PAY_PEL-> // 同上
            // ...
        }
    }
    private fun addCardFailed(paymentType: PaymentType){
        when (paymentType) {
            PaymentType.ADD_GOOGLE_PAY -> // 添加對應(yīng)的支付方式失敗，展示失敗的ui
            PaymentType.ADD_PAY_PEL-> // 同上
            // ...
        }
    }
    enum class PaymentType {
        ADD_GOOGLE_PAY, ADD_PAY_PEL, ADD_ALI_PAY, ADD_STRIPE
    }
}

class AddPlatformActivity : BaseActivity() {
    private var addPayPlatform: IAddPayPlatform? = null
    private fun addPlatform(payPlatform: String) {
        // 將后臺返回的支付平臺字符串變成枚舉類
        val platform: PayPlatform = getPayPlatform(payPlatform) ?: return
        addPayPlatform = AddPayPlatformFactory.getCurrentPlatform(this, platform)
        addPayPlatform?.getLoadingLiveData()?.observe(this@AddPlatformActivity) { showLoading ->
                if (showLoading) startLoading() else stopLoading()
            }
        addPayPlatform?.addPayPlatform(AddCardParameter(platform))
    }
    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // 將onActivityResult的回調(diào)轉(zhuǎn)接到需要監(jiān)聽的策略類里面
        addPayPlatform?.thirdAuthenticationCallback(requestCode, resultCode, data)
    }
}

interface IAddPayPlatform {
    fun addPayPlatform(param: AddCardParameter)
    fun thirdAuthenticationCallback(requestCode: Int?, resultCode: Int?, data: Intent?)
    fun addCardFailed(message: String?)
    fun addCardSuccess()
}

open class AddCardParameter(val platform: PayPlatform)
class AddStripeParameter(val card: Card, val setPrimaryCard: Boolean, platform: PayPlatform)
    : AddCardParameter(platform = PayPlatform.Stripe)

interface IAddPayPlatform {
    // ...
    fun getLoadingLiveData(): LiveData<Boolean>?
}

abstract class BaseAddPayStrategy(val activity: AppCompatActivity, val platform: PayPlatform) : IAddPayPlatform {
  private val loadingLiveData = SingleLiveData<Boolean>()
  protected val startActivityIntentLiveData = SingleLiveData<Intent>()
  override fun getLoadingLiveData(): LiveData<Boolean> = loadingLiveData
  protected fun startLoading() = loadingLiveData.setValue(true)
  protected fun stopLoading() = loadingLiveData.setValue(false)
  private fun reloadWallet() {
      startLoading()
      // 添加卡片完成后，重新刷新錢包數(shù)據(jù)
  }
  override fun addCardSuccess() {
      reloadWallet()
  }
  override fun addCardFailed(message: String?) {
      stopLoading()
      if (isEWalletPlatform(platform)) showAddEWalletFailedView() else showAddPhysicalCardFailedView(message)
  }
   /**
    * 添加實(shí)體卡片失敗展示ui
    */
  private fun showAddPhysicalCardFailedView(message: String?) {
       showSaveErrorDialog(activity, message)
  }
   /**
    * 添加實(shí)體卡片成功展示ui
    */
  private fun showAddPhysicalCardSuccessView() {
      showCreditCardAdded(activity) {
          activity.setResult(Activity.RESULT_OK)
          activity.finish()
      }
  }
  private fun showAddEWalletSucceedView() {
      // 添加電子錢包成功后的執(zhí)行
      activity.setResult(Activity.RESULT_OK)
      activity.finish()
  }
  private fun showAddEWalletFailedView() {
      // 添加電子錢包失敗后的執(zhí)行
  }
  // ---默認(rèn)空實(shí)現(xiàn)，有些支付方式不需要這些方法---
  override fun thirdAuthenticationCallback(requestCode: Int?, resultCode: Int?, data: Intent?) = Unit
  override fun getStartActivityIntent(): LiveData<Intent> = startActivityIntentLiveData
}

class AddXXXPayStrategy(activity: AppCompatActivity) : BaseAddPayStrategy(activity, PayPlatform.XXX) {
  protected val addPaymentViewModel: AddPaymentViewModel by lazy {
      ViewModelProvider(activity).get(AddPaymentViewModel::class.java)
  }
  init {
      addPaymentViewModel.eWalletAuthorizeLiveData.observeState(activity) {
          onSuccess { addCardSuccess()}
          onError { addCardFailed(it.detailed) }
      }
  }
  override fun thirdAuthenticationCallback(requestCode: Int?, resultCode: Int?, result: Intent?) {
      val uri: Uri = result?.data ?: return
      if (uri.host == "www.xxx.com") {
          uri.getQueryParameter("transactionId")?.let {
              addPaymentViewModel.confirmEWalletAuthorize(platform.name, it)
          }
      }
  }
  override fun addPayPlatform(param: AddCardParameter) {
      startLoading()
      addPaymentViewModel.addXXXCard(param)
  }
}

fun setCurrentPlatform(activity: AppCompatActivity, payPlatform: PayPlatform): IAddPayPlatform? {
    return when (payPlatform) {
        PayPlatform.STRIPE -> AddStripeStrategy(activity)
        PayPlatform.PAYPAL -> AddPayPalStrategy(activity)
        PayPlatform.LINEPAY -> AddLinePayStrategy(activity)
        PayPlatform.GOOGLEPAY -> AddGooglePayStrategy(activity)
        PayPlatform.RAPYD -> AddRapydStrategy(activity)
        else -> null
    }
}