/*
 * Copyright (C) 2014 Apple Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
 * THE POSSIBILITY OF SUCH DAMAGE.
 */

#import "config.h"
#import "ProcessAssertion.h"

#if PLATFORM(IOS)

#import <AssertionServices/BKSProcessAssertion.h>

namespace WebKit {

#if !PLATFORM(IOS_SIMULATOR)
const BKSProcessAssertionFlags suspendedTabFlags = (BKSProcessAssertionAllowIdleSleep);
const BKSProcessAssertionFlags backgroundTabFlags = (BKSProcessAssertionAllowIdleSleep | BKSProcessAssertionPreventTaskSuspend | BKSProcessAssertionAllowSuspendOnSleep);
const BKSProcessAssertionFlags foregroundTabFlags = (BKSProcessAssertionAllowIdleSleep | BKSProcessAssertionPreventTaskSuspend | BKSProcessAssertionAllowSuspendOnSleep | BKSProcessAssertionWantsForegroundResourcePriority | BKSProcessAssertionPreventTaskThrottleDown);
    
static BKSProcessAssertionFlags flagsForState(AssertionState assertionState)
{
    switch (assertionState) {
    case AssertionState::Suspended:
        return suspendedTabFlags;
    case AssertionState::Background:
        return backgroundTabFlags;
    case AssertionState::Foreground:
        return foregroundTabFlags;
    }
}
#endif

ProcessAssertion::ProcessAssertion(pid_t pid, AssertionState assertionState)
{
    m_assertionState = assertionState;
    
#if PLATFORM(IOS_SIMULATOR)
    UNUSED_PARAM(pid);
#else
    BKSProcessAssertionAcquisitionHandler handler = ^(BOOL acquired) {
        if (!acquired) {
            LOG_ERROR("Unable to acquire assertion for process %d", pid);
            ASSERT_NOT_REACHED();
        }
    };
    m_assertion = adoptNS([[BKSProcessAssertion alloc] initWithPID:pid flags:flagsForState(assertionState) reason:BKSProcessAssertionReasonExtension name:@"Web content visible" withHandler:handler]);
#endif
}

void ProcessAssertion::setState(AssertionState assertionState)
{
    if (m_assertionState == assertionState)
        return;

    m_assertionState = assertionState;
#if !PLATFORM(IOS_SIMULATOR)
    [m_assertion setFlags:flagsForState(assertionState)];
#endif
}
    
}

#endif // PLATFORM(IOS) && USE(XPC_SERVICES)