/*
 * Copyright (C) 2023 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 android.tools.traces.surfaceflinger

import android.tools.Timestamp
import android.tools.Trace

class TransactionsTrace(override val entries: Collection<TransactionsTraceEntry>) :
    Trace<TransactionsTraceEntry> {

    init {
        val alwaysIncreasing =
            entries
                .zipWithNext { prev, next ->
                    prev.timestamp.elapsedNanos < next.timestamp.elapsedNanos
                }
                .all { it }

        require(alwaysIncreasing) {
            "Transaction timestamp not always increasing: " +
                "[${entries.joinToString { it.timestamp.toString() }}]"
        }
    }

    val allTransactions: Collection<Transaction> = entries.flatMap { it.transactions }

    override fun slice(startTimestamp: Timestamp, endTimestamp: Timestamp): TransactionsTrace {
        return TransactionsTrace(
            entries
                .dropWhile { it.timestamp < startTimestamp }
                .dropLastWhile { it.timestamp > endTimestamp }
        )
    }
}