android-base/app/src/main/java/com/flatstack/android/activities/ActivitiesRepository.kt at 9641a6e7a0cb36b06a3f8e6f801226157e17af43 · fs/android-base · GitHub

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package com.flatstack.android.activities

import androidx.lifecycle.asFlow
import androidx.paging.DataSource
import androidx.paging.LivePagedListBuilder
import androidx.paging.PageKeyedDataSource
import androidx.paging.PagedList
import com.apollographql.apollo.ApolloClient
import com.apollographql.apollo.api.Input
import com.apollographql.apollo.coroutines.toDeferred
import com.flatstack.android.fragment.ActivityConnectionFragment.Edge
import com.flatstack.android.fragment.ActivityConnectionFragment.PageInfo
import com.flatstack.android.graphql.query.GetActivitiesQuery
import com.flatstack.android.profile.entities.Profile
import com.flatstack.android.type.ActivityEvent
import kotlinx.coroutines.CoroutineScope
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.launch

class ActivitiesRepository(
    private val apolloClient: ApolloClient
) {
    @Suppress("LongMethod")
    fun getPagedUserActivities(coroutineScope: CoroutineScope, events: List<ActivityEvent>) =
        LivePagedListBuilder(
            object : DataSource.Factory<PageInfo, Edge>() {
                override fun create(): DataSource<PageInfo, Edge> =
                    object : PageKeyedDataSource<PageInfo, Edge>() {
                        override fun loadInitial(
                            params: LoadInitialParams<PageInfo>,
                            callback: LoadInitialCallback<PageInfo, Edge>
                        ) {
                            coroutineScope.launch(Dispatchers.IO) {
                                apolloClient.query(
                                    GetActivitiesQuery(
                                        events = Input.optional(events),
                                        first = Input.optional(PAGE_SIZE)
                                    )
                                ).toDeferred()
                                    .await().data?.activities?.fragments?.activityConnectionFragment?.let {
                                        it.edges?.let { edges ->
                                            callback.onResult(
                                                edges,
                                                null,
                                                it.pageInfo
                                            )
                                        }
                                    }
                            }
                        }

                        override fun loadAfter(
                            params: LoadParams<PageInfo>,
                            callback: LoadCallback<PageInfo, Edge>
                        ) {
                            coroutineScope.launch(Dispatchers.IO) {
                                apolloClient.query(
                                    GetActivitiesQuery(
                                        after = Input.optional(params.key.endCursor),
                                        events = Input.optional(events),
                                        first = Input.optional(PAGE_SIZE)
                                    )
                                ).toDeferred()
                                    .await().data?.activities?.fragments?.activityConnectionFragment?.let {
                                        it.edges?.let { edges ->
                                            callback.onResult(
                                                edges,
                                                it.pageInfo
                                            )
                                        }
                                    }
                            }
                        }

                        override fun loadBefore(
                            params: LoadParams<PageInfo>,
                            callback: LoadCallback<PageInfo, Edge>
                        ) {
                            coroutineScope.launch(Dispatchers.IO) {
                                apolloClient.query(
                                    GetActivitiesQuery(
                                        before = Input.optional(params.key.startCursor),
                                        events = Input.optional(events),
                                        first = Input.optional(PAGE_SIZE)
                                    )
                                ).toDeferred()
                                    .await().data?.activities?.fragments?.activityConnectionFragment?.let {
                                        it.edges?.let { edges ->
                                            callback.onResult(
                                                edges,
                                                it.pageInfo
                                            )
                                        }
                                    }
                            }
                        }
                    }
            }
                .mapByPage { edges ->
                    edges.map { edge ->
                        edge.node?.fragments?.activityFragment?.let { fragment ->
                            ActivitiesViewHolderModel(
                                body = fragment.body,
                                createdAt = fragment.createdAt.toString(),
                                event = fragment.event,
                                id = fragment.id,
                                title = fragment.title,
                                user = Profile(
                                    firstName = fragment.user.firstName ?: "",
                                    lastName = fragment.user.lastName ?: ""
                                )
                            )
                        }
                    }
                },
            PagedList.Config.Builder()
                .setEnablePlaceholders(false)
                .setPageSize(PAGE_SIZE)
                .build()
        ).build().asFlow()

    companion object {
        private const val PAGE_SIZE = 15
    }
}