From 08b10a2408f958cae96ae0c674ee450a35109e8a Mon Sep 17 00:00:00 2001
From: Torsten Grote <t@grobox.de>
Date: Thu, 23 Jul 2020 11:54:34 -0300
Subject: [pos] delete unpaid/unclaimed orders when user cancels or timeout
 happens

This is still not working due to a bug in the merchant API
---
 .../main/java/net/taler/merchantlib/MerchantApi.kt | 29 ++++++++++++++--------
 .../main/java/net/taler/merchantlib/Response.kt    |  8 ++++++
 .../taler/merchantpos/payment/PaymentManager.kt    | 17 +++++++++++--
 3 files changed, 41 insertions(+), 13 deletions(-)

diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt b/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt
index 335e42d..06388f4 100644
--- a/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt
+++ b/merchant-lib/src/main/java/net/taler/merchantlib/MerchantApi.kt
@@ -16,26 +16,27 @@
 
 package net.taler.merchantlib
 
+import android.util.Log
 import io.ktor.client.HttpClient
 import io.ktor.client.engine.okhttp.OkHttp
 import io.ktor.client.features.json.JsonFeature
 import io.ktor.client.features.json.serializer.KotlinxSerializer
+import io.ktor.client.request.delete
 import io.ktor.client.request.get
 import io.ktor.client.request.header
 import io.ktor.client.request.post
+import io.ktor.client.statement.HttpResponse
+import io.ktor.client.statement.readBytes
 import io.ktor.http.ContentType.Application.Json
 import io.ktor.http.HttpHeaders.Authorization
 import io.ktor.http.contentType
 import kotlinx.serialization.json.Json
 import kotlinx.serialization.json.JsonConfiguration
 import net.taler.common.ContractTerms
-import net.taler.merchantlib.Response.Companion.failure
-import net.taler.merchantlib.Response.Companion.success
+import net.taler.merchantlib.Response.Companion.response
 
 class MerchantApi(private val httpClient: HttpClient) {
 
-    constructor() : this(getDefaultHttpClient())
-
     suspend fun getConfig(baseUrl: String): ConfigResponse {
         return httpClient.get("$baseUrl/config")
     }
@@ -60,16 +61,22 @@ class MerchantApi(private val httpClient: HttpClient) {
         } as CheckPaymentResponse
     }
 
-    private suspend fun <T> response(request: suspend () -> T): Response<T> {
-        return try {
-            success(request())
-        } catch (e: Throwable) {
-            failure(e)
-        }
+    suspend fun deleteOrder(
+        merchantConfig: MerchantConfig,
+        orderId: String
+    ): Response<HttpResponse> = response {
+        val resp = httpClient.delete(merchantConfig.urlFor("private/orders/$orderId")) {
+            header(Authorization, "ApiKey ${merchantConfig.apiKey}")
+        } as HttpResponse
+        // TODO remove when the API call was fixed
+        Log.e("TEST", "status: ${resp.status.value}")
+        Log.e("TEST", String(resp.readBytes()))
+        resp
     }
+
 }
 
-private fun getDefaultHttpClient(): HttpClient = HttpClient(OkHttp) {
+fun getDefaultHttpClient(): HttpClient = HttpClient(OkHttp) {
     install(JsonFeature) {
         serializer = getSerializer()
     }
diff --git a/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt b/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt
index 23fa101..eb1ef27 100644
--- a/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt
+++ b/merchant-lib/src/main/java/net/taler/merchantlib/Response.kt
@@ -25,6 +25,14 @@ class Response<out T> private constructor(
 ) {
 
     companion object {
+        suspend fun <T> response(request: suspend () -> T): Response<T> {
+            return try {
+                success(request())
+            } catch (e: Throwable) {
+                failure(e)
+            }
+        }
+
         fun <T> success(value: T): Response<T> =
             Response(value)
 
diff --git a/merchant-terminal/src/main/java/net/taler/merchantpos/payment/PaymentManager.kt b/merchant-terminal/src/main/java/net/taler/merchantpos/payment/PaymentManager.kt
index e238284..ea16cb4 100644
--- a/merchant-terminal/src/main/java/net/taler/merchantpos/payment/PaymentManager.kt
+++ b/merchant-terminal/src/main/java/net/taler/merchantpos/payment/PaymentManager.kt
@@ -18,6 +18,7 @@ package net.taler.merchantpos.payment
 
 import android.content.Context
 import android.os.CountDownTimer
+import android.util.Log
 import androidx.annotation.UiThread
 import androidx.lifecycle.LiveData
 import androidx.lifecycle.MutableLiveData
@@ -27,6 +28,7 @@ import kotlinx.coroutines.launch
 import net.taler.merchantlib.CheckPaymentResponse
 import net.taler.merchantlib.MerchantApi
 import net.taler.merchantlib.PostOrderResponse
+import net.taler.merchantpos.MainActivity.Companion.TAG
 import net.taler.merchantpos.R
 import net.taler.merchantpos.config.ConfigManager
 import net.taler.merchantpos.order.Order
@@ -54,8 +56,7 @@ class PaymentManager(
         }
 
         override fun onFinish() {
-            val str = context.getString(R.string.error_timeout)
-            payment.value?.copy(error = str)?.let { mPayment.value = it }
+            cancelPayment(context.getString(R.string.error_timeout))
         }
     }
 
@@ -97,7 +98,19 @@ class PaymentManager(
         cancelPayment(error)
     }
 
+    @UiThread
     fun cancelPayment(error: String) {
+        // delete unpaid order
+        val merchantConfig = configManager.merchantConfig!!
+        mPayment.value?.let { payment ->
+            if (!payment.paid) payment.orderId?.let { orderId ->
+                Log.e(TAG, "Deleting cancelled and unpaid order $orderId")
+                scope.launch(Dispatchers.IO) {
+                    api.deleteOrder(merchantConfig.convert(), orderId)
+                }
+            }
+        }
+
         mPayment.value = mPayment.value!!.copy(error = error)
         checkTimer.cancel()
     }
-- 
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