refactor: [database/charge] dbflow to room (#2312)

* MIFOSAC-392 [database/charge] dbflow to room

* backup

* Fix exception

* added singleton

core/common/src/main/java/com/mifos/core/common/utils/DatabaseFetchException.kt

@@ -0,0 +1,15 @@
+/*
+ * Copyright 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See https://github.com/openMF/android-client/blob/master/LICENSE.md
+ */
+package com.mifos.core.common.utils
+
+class DatabaseFetchException(
+    message: String,
+    cause: Throwable? = null,
+) : Exception(message, cause)

core/common/src/main/java/com/mifos/core/common/utils/FlowCallAdapterFactory.kt

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See https://github.com/openMF/android-client/blob/master/LICENSE.md
+ */
+package com.mifos.core.common.utils
+
+import kotlinx.coroutines.flow.Flow
+import retrofit2.CallAdapter
+import retrofit2.Response
+import retrofit2.Retrofit
+import java.lang.reflect.ParameterizedType
+import java.lang.reflect.Type
+
+class FlowCallAdapterFactory private constructor() : CallAdapter.Factory() {
+    override fun get(
+        returnType: Type,
+        annotations: Array<Annotation>,
+        retrofit: Retrofit,
+    ): CallAdapter<*, *>? {
+        if (getRawType(returnType) != Flow::class.java) {
+            return null
+        }
+        check(returnType is ParameterizedType) { "Flow return type must be parameterized as Flow<Foo> or Flow<out Foo>" }
+        val responseType = getParameterUpperBound(0, returnType)
+        val rawFlowType = getRawType(responseType)
+        return if (rawFlowType == Response::class.java) {
+            check(responseType is ParameterizedType) { "Response must be parameterized as Response<Foo> or Response<out Foo>" }
+            ResponseCallAdapter<Any>(
+                getParameterUpperBound(
+                    0,
+                    responseType,
+                ),
+            )
+        } else {
+            BodyCallAdapter<Any>(responseType)
+        }
+    }
+
+    companion object {
+        @JvmStatic
+        fun create() = FlowCallAdapterFactory()
+    }
+}

core/common/src/main/java/com/mifos/core/common/utils/ResponseCallAdapter.kt

@@ -0,0 +1,72 @@
+/*
+ * Copyright 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See https://github.com/openMF/android-client/blob/master/LICENSE.md
+ */
+package com.mifos.core.common.utils // FlowCallAdapter.kt
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flow
+import kotlinx.coroutines.suspendCancellableCoroutine
+import retrofit2.Call
+import retrofit2.CallAdapter
+import retrofit2.Callback
+import retrofit2.Response
+import java.lang.reflect.Type
+import kotlin.coroutines.resume
+import kotlin.coroutines.resumeWithException
+
+class ResponseCallAdapter<T>(
+    private val responseType: Type,
+) : CallAdapter<T, Flow<Response<T>>> {
+    override fun adapt(call: Call<T>): Flow<Response<T>> {
+        return flow {
+            emit(
+                suspendCancellableCoroutine { continuation ->
+                    call.enqueue(object : Callback<T> {
+                        override fun onFailure(call: Call<T>, t: Throwable) {
+                            continuation.resumeWithException(t)
+                        }
+
+                        override fun onResponse(call: Call<T>, response: Response<T>) {
+                            continuation.resume(response)
+                        }
+                    })
+                    continuation.invokeOnCancellation { call.cancel() }
+                },
+            )
+        }
+    }
+
+    override fun responseType() = responseType
+}
+
+class BodyCallAdapter<T>(private val responseType: Type) : CallAdapter<T, Flow<T>> {
+    override fun adapt(call: Call<T>): Flow<T> {
+        return flow {
+            emit(
+                suspendCancellableCoroutine { continuation ->
+                    call.enqueue(object : Callback<T> {
+                        override fun onFailure(call: Call<T>, t: Throwable) {
+                            continuation.resumeWithException(t)
+                        }
+
+                        override fun onResponse(call: Call<T>, response: Response<T>) {
+                            try {
+                                continuation.resume(response.body()!!)
+                            } catch (e: Exception) {
+                                continuation.resumeWithException(e)
+                            }
+                        }
+                    })
+                    continuation.invokeOnCancellation { call.cancel() }
+                },
+            )
+        }
+    }
+
+    override fun responseType() = responseType
+}

core/data/src/main/java/com/mifos/core/data/pagingSource/ClientChargesPagingSource.kt

@@ -11,15 +11,12 @@ package com.mifos.core.data.pagingSource
 
 import androidx.paging.PagingSource
 import androidx.paging.PagingState
-import com.mifos.core.entity.client.Charges
+import com.mifos.core.common.utils.DatabaseFetchException
+import com.mifos.core.model.objects.clients.Page
 import com.mifos.core.network.datamanager.DataManagerCharge
-import com.mifos.core.objects.clients.Page
-import kotlinx.coroutines.suspendCancellableCoroutine
-import rx.Subscriber
-import rx.android.schedulers.AndroidSchedulers
-import rx.schedulers.Schedulers
-import kotlin.coroutines.resume
-import kotlin.coroutines.resumeWithException
+import com.mifos.room.entities.client.Charges
+import kotlinx.coroutines.flow.catch
+import kotlinx.coroutines.flow.first
 
 class ClientChargesPagingSource(
     private val clientId: Int,
@@ -48,29 +45,29 @@ class ClientChargesPagingSource(
             )
         } catch (exception: Exception) {
             LoadResult.Error(exception)
+        } catch (exception: DatabaseFetchException) {
+            LoadResult.Error(exception)
         }
     }
 
     private suspend fun getClientChargeList(
         clientId: Int,
         position: Int,
     ): Pair<List<Charges>, Int> {
-        return suspendCancellableCoroutine { continuation ->
-            dataManagerCharge.getClientCharges(clientId = clientId, offset = position, 10)
-                .observeOn(AndroidSchedulers.mainThread())
-                .subscribeOn(Schedulers.io())
-                .subscribe(object : Subscriber<Page<Charges>>() {
-                    override fun onCompleted() {
-                    }
-
-                    override fun onError(exception: Throwable) {
-                        continuation.resumeWithException(exception)
-                    }
+        var page: Page<Charges>? = null
 
-                    override fun onNext(page: Page<Charges>) {
-                        continuation.resume(Pair(page.pageItems, page.totalFilteredRecords))
-                    }
-                })
+        dataManagerCharge.getClientCharges(
+            clientId = clientId,
+            offset = position,
+            limit = 10,
+        ).catch {
+            throw DatabaseFetchException("Failed to fetch client charges")
+        }.collect {
+            page = it
         }
+
+        return page?.let {
+            Pair(it.pageItems, it.totalFilteredRecords)
+        } ?: throw DatabaseFetchException("Failed to fetch client charges")
     }
 }

core/database/src/main/java/com/mifos/room/dao/ChargeDao.kt

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2025 Mifos Initiative
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/.
+ *
+ * See https://github.com/openMF/android-client/blob/master/LICENSE.md
+ */
+package com.mifos.room.dao
+
+import androidx.room.Dao
+import androidx.room.Insert
+import androidx.room.Query
+import com.mifos.room.entities.client.Charges
+import kotlinx.coroutines.flow.Flow
+
+/**
+ * Created by Pronay Sarker on 14/02/2025 (3:32 PM)
+ */
+@Dao
+interface ChargeDao {
+
+    @Query("SELECT * FROM Charges where clientId = :clientId")
+    fun getClientCharges(clientId: Int): Flow<List<Charges>>
+
+    @Insert
+    suspend fun insertAllCharges(vararg charges: List<Charges>)
+}

core/database/src/main/java/com/mifos/room/db/MifosDatabase.kt

@@ -12,9 +12,11 @@ package com.mifos.room.db
 import androidx.room.Database
 import androidx.room.RoomDatabase
 import androidx.room.TypeConverters
+import com.mifos.room.dao.ChargeDao
 import com.mifos.room.dao.ColumnValueDao
 import com.mifos.room.dao.GroupsDao
 import com.mifos.room.dao.LoanDao
+import com.mifos.room.dao.OfficeDao
 import com.mifos.room.dao.StaffDao
 import com.mifos.room.dao.SurveyDao
 import com.mifos.room.entities.PaymentTypeOption
@@ -46,7 +48,6 @@ import com.mifos.room.utils.typeconverters.SurveyTypeConverters
     // [TODO -> add other entities ]
     entities = [
         ColumnValue::class,
-        // loan
         LoanWithAssociations::class,
         LoanRepaymentRequest::class,
         LoanRepaymentTemplate::class,
@@ -55,7 +56,6 @@ import com.mifos.room.utils.typeconverters.SurveyTypeConverters
         Timeline::class,
         Status::class,
         Summary::class,
-        // survey
         Survey::class,
         QuestionDatas::class,
         ResponseDatas::class,
@@ -85,7 +85,9 @@ abstract class MifosDatabase : RoomDatabase() {
     abstract fun loanDao(): LoanDao
     abstract fun surveyDao(): SurveyDao
     abstract fun staffDao(): StaffDao
+    abstract fun officeDao(): OfficeDao
     abstract fun groupsDao(): GroupsDao
+    abstract fun chargeDao(): ChargeDao
 
     companion object {
         const val VERSION = 1

core/database/src/main/java/com/mifos/room/di/DaoModule.kt

@@ -9,6 +9,7 @@
  */
 package com.mifos.room.di
 
+import com.mifos.room.dao.ChargeDao
 import com.mifos.room.dao.ColumnValueDao
 import com.mifos.room.dao.GroupsDao
 import com.mifos.room.dao.LoanDao
@@ -20,37 +21,50 @@ import dagger.Module
 import dagger.Provides
 import dagger.hilt.InstallIn
 import dagger.hilt.components.SingletonComponent
+import javax.inject.Singleton
 
 @Module
 @InstallIn(SingletonComponent::class)
 object DaoModule {
     @Provides
+    @Singleton
     fun providesColumnValueDao(database: MifosDatabase): ColumnValueDao {
         return database.columnValueDao()
     }
 
     @Provides
+    @Singleton
     fun providesLoanDao(database: MifosDatabase): LoanDao {
         return database.loanDao()
     }
 
     @Provides
+    @Singleton
     fun providesSurveyDao(database: MifosDatabase): SurveyDao {
         return database.surveyDao()
     }
 
     @Provides
+    @Singleton
     fun providesStaffDao(database: MifosDatabase): StaffDao {
         return database.staffDao()
     }
 
     @Provides
+    @Singleton
     fun providesGroupDao(database: MifosDatabase): GroupsDao {
         return database.groupsDao()
     }
 
     @Provides
+    @Singleton
     fun providesOfficeDao(database: MifosDatabase): OfficeDao {
         return database.officeDao()
     }
+
+    @Provides
+    @Singleton
+    fun providesClientDao(database: MifosDatabase): ChargeDao {
+        return database.chargeDao()
+    }
 }