/*
 * Copyright 2020 The Matrix.org Foundation C.I.C.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.matrix.android.sdk.internal.session.room.timeline

import org.matrix.android.sdk.api.session.events.model.Event
import org.matrix.android.sdk.internal.crypto.DecryptRoomEventUseCase
import org.matrix.android.sdk.internal.network.GlobalErrorReceiver
import org.matrix.android.sdk.internal.network.executeRequest
import org.matrix.android.sdk.internal.session.room.RoomAPI
import org.matrix.android.sdk.internal.task.Task
import org.matrix.android.sdk.internal.util.time.Clock
import javax.inject.Inject

internal interface GetEventTask : Task<GetEventTask.Params, Event> {
    data class Params(
            val roomId: String,
            val eventId: String
    )
}

internal class DefaultGetEventTask @Inject constructor(
        private val roomAPI: RoomAPI,
        private val globalErrorReceiver: GlobalErrorReceiver,
        private val decryptEvent: DecryptRoomEventUseCase,
        private val clock: Clock,
) : GetEventTask {

    override suspend fun execute(params: GetEventTask.Params): Event {
        val event = executeRequest(globalErrorReceiver) {
            roomAPI.getEvent(params.roomId, params.eventId)
        }

        // Try to decrypt the Event
        if (event.isEncrypted()) {
            decryptEvent.decryptAndSaveResult(event)
        }

        event.ageLocalTs = clock.epochMillis() - (event.unsignedData?.age ?: 0)

        return event
    }
}
