/*
 * Copyright 2021 The Android Open Source Project
 *
 * 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 androidx.paging

class LoadStateCapture : (LoadType, LoadState) -> Unit {
    private var lastEventsListIndex = -1

    val events = mutableListOf<LoadStateEvent>()

    override fun invoke(type: LoadType, state: LoadState) {
        events.add(LoadStateEvent(type, state))
    }

    fun newEvents(): List<LoadStateEvent> {
        return events.drop(lastEventsListIndex + 1).also { lastEventsListIndex = events.lastIndex }
    }
}

data class LoadStateEvent(
    val loadType: LoadType,
    val loadState: LoadState,
)