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/*
 * Copyright 2020-2022 The OSHI Project Contributors
 * SPDX-License-Identifier: MIT
 */
package oshi.software.common;

import static oshi.util.Memoizer.defaultExpiration;
import static oshi.util.Memoizer.memoize;

import java.util.function.Supplier;

import oshi.annotation.concurrent.ThreadSafe;
import oshi.software.os.OSThread;

/**
 * Common methods for OSThread implementation
 */
@ThreadSafe
public abstract class AbstractOSThread implements OSThread {

    private final Supplier cumulativeCpuLoad = memoize(this::queryCumulativeCpuLoad, defaultExpiration());

    private final int owningProcessId;

    protected AbstractOSThread(int processId) {
        this.owningProcessId = processId;
    }

    @Override
    public int getOwningProcessId() {
        return this.owningProcessId;
    }

    @Override
    public double getThreadCpuLoadCumulative() {
        return cumulativeCpuLoad.get();
    }

    private double queryCumulativeCpuLoad() {
        return getUpTime() > 0d ? (getKernelTime() + getUserTime()) / (double) getUpTime() : 0d;
    }

    @Override
    public double getThreadCpuLoadBetweenTicks(OSThread priorSnapshot) {
        if (priorSnapshot != null && owningProcessId == priorSnapshot.getOwningProcessId()
                && getThreadId() == priorSnapshot.getThreadId() && getUpTime() > priorSnapshot.getUpTime()) {
            return (getUserTime() - priorSnapshot.getUserTime() + getKernelTime() - priorSnapshot.getKernelTime())
                    / (double) (getUpTime() - priorSnapshot.getUpTime());
        }
        return getThreadCpuLoadCumulative();
    }

    @Override
    public String toString() {
        return "OSThread [threadId=" + getThreadId() + ", owningProcessId=" + getOwningProcessId() + ", name="
                + getName() + ", state=" + getState() + ", kernelTime=" + getKernelTime() + ", userTime="
                + getUserTime() + ", upTime=" + getUpTime() + ", startTime=" + getStartTime()
                + ", startMemoryAddress=0x" + String.format("%x", getStartMemoryAddress()) + ", contextSwitches="
                + getContextSwitches() + ", minorFaults=" + getMinorFaults() + ", majorFaults=" + getMajorFaults()
                + "]";
    }
}