/
FavoriteFireStoreDatabase.kt
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/
FavoriteFireStoreDatabase.kt
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package io.github.droidkaigi.confsched2018.data.db
import android.support.annotation.CheckResult
import com.google.android.gms.tasks.Task
import com.google.firebase.auth.FirebaseAuth
import com.google.firebase.auth.FirebaseUser
import com.google.firebase.firestore.DocumentSnapshot
import com.google.firebase.firestore.EventListener
import com.google.firebase.firestore.FirebaseFirestore
import com.google.firebase.firestore.QuerySnapshot
import io.github.droidkaigi.confsched2018.model.Session
import io.reactivex.BackpressureStrategy
import io.reactivex.Flowable
import io.reactivex.Observable
import io.reactivex.ObservableEmitter
import io.reactivex.Single
import io.reactivex.SingleEmitter
import io.reactivex.android.MainThreadDisposable
import timber.log.Timber
class FavoriteFireStoreDatabase : FavoriteDatabase {
private var isInitialized = false
@CheckResult
private fun getCurrentUser(): Single<FirebaseUser> = Single.create({ e ->
val auth = FirebaseAuth.getInstance()
val currentUser = auth.currentUser
if (currentUser != null) {
if (DEBUG) Timber.d("FireStore:Get chached user")
e.onSuccess(currentUser)
return@create
}
auth.signInAnonymously()
.addOnCompleteListener { task ->
if (task.isSuccessful) {
if (DEBUG) Timber.d("FireStore:Sign in Anonymously")
e.onSuccess(auth.currentUser!!)
} else {
if (DEBUG) Timber.d("FireStore:Sign in error")
e.onError(task.exception!!)
}
}
})
override fun favorite(session: Session): Single<Boolean> = if (!isInitialized) {
Single.error(NotPrepairedException())
} else {
getCurrentUser().flatMap { currentUser ->
return@flatMap Single.create<Boolean>({ e ->
val database = FirebaseFirestore.getInstance()
val favorites = database.collection("users/${currentUser.uid}/favorites")
.document(session.id)
favorites.get().addOnCompleteListener({ task: Task<DocumentSnapshot> ->
if (DEBUG) Timber.d("FireStore:favorite get")
if (task.isSuccessful) {
val result = task.result
val nowFavorite = result.exists() && (result.data[session.id] == true)
val newFavorite = !nowFavorite
val completeListener: (Task<Void>) -> Unit = {
val exception = it.exception
if (exception != null) {
if (DEBUG) Timber.d(exception, "FireStore:favorite wirte fail")
e.onError(exception)
} else {
if (DEBUG) Timber.d("FireStore:favorite wirte success")
e.onSuccess(newFavorite)
}
}
val sessionToFavoriteMap = mapOf("favorite" to newFavorite)
if (result.exists()) {
favorites.delete().addOnCompleteListener(completeListener)
} else {
val set = favorites.set(sessionToFavoriteMap)
set.addOnCompleteListener(completeListener)
}
} else {
e.onError(task.exception!!)
}
})
})
}
}
@get:CheckResult
override val favorites: Flowable<List<Int>> = getCurrentUser()
.flatMap { user: FirebaseUser ->
return@flatMap setupFavoritesDocument(user)
}
.flatMapObservable { user: FirebaseUser ->
return@flatMapObservable getFavorites(user)
}
.doOnNext { isInitialized = true }
.toFlowable(BackpressureStrategy.DROP)
.cache()
@CheckResult
private fun setupFavoritesDocument(currentUser: FirebaseUser): Single<FirebaseUser> {
return Single.create({ e: SingleEmitter<FirebaseUser> ->
if (DEBUG) Timber.d("FireStore:setupFavoritesDocument")
val database = FirebaseFirestore.getInstance()
val favorites = database.collection("users/" + currentUser.uid + "/favorites")
favorites.get().addOnCompleteListener { task ->
if (DEBUG) Timber.d("FireStore:setupFavoritesDocument onComplete")
if (!task.isSuccessful) {
Timber.e(task.exception!!, "FireStore:setupFavoritesDocument onComplete fail ")
e.onError(task.exception!!)
return@addOnCompleteListener
}
if (!task.result.isEmpty) {
// FIXME: I want to create document without setting value
favorites.add(mapOf("initialized" to true)).addOnCompleteListener {
if (DEBUG) Timber.d("FireStore:create document for listeing")
e.onSuccess(currentUser)
}
} else {
if (DEBUG) Timber.d("FireStore:document already exists")
e.onSuccess(currentUser)
}
}
return@create
})
}
@CheckResult
private fun getFavorites(currentUser: FirebaseUser): Observable<List<Int>> {
return Observable.create<List<Int>>({ e: ObservableEmitter<List<Int>> ->
if (e.isDisposed) {
e.onComplete()
}
if (DEBUG) Timber.d("FireStore:getFavorites")
val database = FirebaseFirestore.getInstance()
val favorites = database.collection("users/" + currentUser.uid + "/favorites")
.whereEqualTo("favorite", true)
val eventListener = EventListener<QuerySnapshot> { documentSnapshot, exception ->
if (exception != null) {
if (DEBUG) Timber.d("FireStore:getFavorites onChange exception")
e.onError(exception)
return@EventListener
}
if (!documentSnapshot.isEmpty) {
if (DEBUG) Timber.d("FireStore:getFavorites onChange")
val documents = documentSnapshot.documents
val favoriteSessionIds = documents
.mapNotNull { document -> document.id.toIntOrNull() }
.toList()
if (DEBUG) Timber.d("FireStore:getFavorites onChange %s", favoriteSessionIds)
e.onNext(favoriteSessionIds)
} else {
if (DEBUG) Timber.d("FireStore:getFavorites return empty")
e.onNext(listOf())
}
}
val removable = favorites.addSnapshotListener(eventListener)
e.setDisposable(object : MainThreadDisposable() {
override fun onDispose() {
if (DEBUG) Timber.d("FireStore:getFavorites dispose")
removable.remove()
}
})
})
}
class NotPrepairedException : RuntimeException()
companion object {
private const val DEBUG: Boolean = false
}
}