#ifdef MTK_VSYNC_HINT_SUPPORT
#include "VSyncHinter.h"

#include <cinttypes>
#include <cstring>
#include <dlfcn.h>
#include <log/log.h>
#include <stdlib.h>

#include "vsync_hint/VsyncHintApi.h"

namespace android {

#undef LOG_TAG
#define LOG_TAG "VSyncHinter"

VSyncHinter& VSyncHinter::getInstance() {
    static VSyncHinter gInstance;
    return gInstance;
}

VSyncHinter::VSyncHinter() {
    typedef VsyncHintApi* (*createVsyncHintPrototype)();
    mVSyncHint = NULL;
    mVSyncHintHandle = dlopen("libvsync_hint.so", RTLD_LAZY);
    if (mVSyncHintHandle) {
        createVsyncHintPrototype createPtr = reinterpret_cast<createVsyncHintPrototype>(dlsym(mVSyncHintHandle, "createVsyncHint"));
        if (createPtr) {
            mVSyncHint = createPtr();
            if (!mVSyncHint) {
                ALOGW("Failed to create VSyncHint");
            }
        } else {
            ALOGW("Failed to get function: createVsyncHint");
        }
    } else {
        ALOGW("Failed to load libvsync_hint.so");
    }

    mLastNotifyVsync = 0;
    mLastPeriod = 0;
}

VSyncHinter::~VSyncHinter() {
    if (mVSyncHint) {
        delete mVSyncHint;
    }
    if (mVSyncHintHandle) {
        dlclose(mVSyncHintHandle);
    }
}

void VSyncHinter::fillVSyncInfo(VSyncInfo& info, const char* name) {
    if (!strcmp(name, "sf")) {
        info.mVSyncType = VsyncHintApi::VSYNC_TYPE_SF;
    } else if (!strcmp(name, "app")) {
        info.mVSyncType = VsyncHintApi::VSYNC_TYPE_APP;
    } else {
        info.mVSyncType = VsyncHintApi::VSYNC_TYPE_UNKNOWN;
    }
}

void VSyncHinter::onDispSyncEvent(VSyncInfo& info, nsecs_t period) {
    if (!mVSyncHint) {
        return;
    }

    mVSyncHint->notifyVsync(info.mVSyncType, period);
}

void VSyncHinter::notifyVsyncPeriod(nsecs_t period) {
    if (!mVSyncHint) {
        return;
    }
    nsecs_t now = systemTime();
    nsecs_t diff = now - mLastNotifyVsync;
    float ratio = static_cast<float>(abs(mLastPeriod - period)) / static_cast<float>(mLastPeriod);
    if (mLastNotifyVsync == 0 ||
        mLastPeriod == 0 ||
        diff > 300000000  || /* 300ms */
        ratio > 0.01) { /* 1% */
        mVSyncHint->notifyVsyncPeriod(period);
        // ALOGI("notifyVsyncPeriod notify");
        mLastNotifyVsync = now;
        mLastPeriod = period;
    }
    //ALOGI("notifyVsyncPeriod mLastNotifyVsync=%" PRId64 ", mLastPeriod=%" PRId64 ", period=%" PRId64 ", diff=%" PRId64 ", ratio=%f",
    //    mLastNotifyVsync, mLastPeriod, period, diff, ratio);
}

} // namespace android
#endif