/*
 * Copyright (C) 2011 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.
 */

#include "rsDevice.h"
#include "rsContext.h"
#include "rsThreadIO.h"
#include <ui/FramebufferNativeWindow.h>
#include <ui/PixelFormat.h>
#include <ui/egl/android_natives.h>

#include <sys/types.h>
#include <sys/resource.h>
#include <sched.h>

#include <cutils/properties.h>

#include <cutils/sched_policy.h>
#include <sys/syscall.h>
#include <string.h>

using namespace android;
using namespace android::renderscript;

pthread_mutex_t Context::gInitMutex = PTHREAD_MUTEX_INITIALIZER;
pthread_mutex_t Context::gLibMutex = PTHREAD_MUTEX_INITIALIZER;

bool Context::initGLThread() {
    pthread_mutex_lock(&gInitMutex);
    LOGV("initGLThread start %p", this);

    if (!mHal.funcs.initGraphics(this)) {
        pthread_mutex_unlock(&gInitMutex);
        LOGE("%p, initGraphics failed", this);
        return false;
    }

    pthread_mutex_unlock(&gInitMutex);
    return true;
}

void Context::deinitEGL() {
    LOGV("%p, deinitEGL", this);
    mHal.funcs.shutdownGraphics(this);
}

Context::PushState::PushState(Context *con) {
    mRsc = con;
    if (con->mIsGraphicsContext) {
        mFragment.set(con->getProgramFragment());
        mVertex.set(con->getProgramVertex());
        mStore.set(con->getProgramStore());
        mRaster.set(con->getProgramRaster());
        mFont.set(con->getFont());
    }
}

Context::PushState::~PushState() {
    if (mRsc->mIsGraphicsContext) {
        mRsc->setProgramFragment(mFragment.get());
        mRsc->setProgramVertex(mVertex.get());
        mRsc->setProgramStore(mStore.get());
        mRsc->setProgramRaster(mRaster.get());
        mRsc->setFont(mFont.get());
    }
}


uint32_t Context::runScript(Script *s) {
    PushState(this);

    uint32_t ret = s->run(this);
    return ret;
}

uint32_t Context::runRootScript() {
    timerSet(RS_TIMER_SCRIPT);
    mStateFragmentStore.mLast.clear();
    uint32_t ret = runScript(mRootScript.get());

    return ret;
}

uint64_t Context::getTime() const {
    struct timespec t;
    clock_gettime(CLOCK_MONOTONIC, &t);
    return t.tv_nsec + ((uint64_t)t.tv_sec * 1000 * 1000 * 1000);
}

void Context::timerReset() {
    for (int ct=0; ct < _RS_TIMER_TOTAL; ct++) {
        mTimers[ct] = 0;
    }
}

void Context::timerInit() {
    mTimeLast = getTime();
    mTimeFrame = mTimeLast;
    mTimeLastFrame = mTimeLast;
    mTimerActive = RS_TIMER_INTERNAL;
    mAverageFPSFrameCount = 0;
    mAverageFPSStartTime = mTimeLast;
    mAverageFPS = 0;
    timerReset();
}

void Context::timerFrame() {
    mTimeLastFrame = mTimeFrame;
    mTimeFrame = getTime();
    // Update average fps
    const uint64_t averageFramerateInterval = 1000 * 1000000;
    mAverageFPSFrameCount ++;
    uint64_t inverval = mTimeFrame - mAverageFPSStartTime;
    if (inverval >= averageFramerateInterval) {
        inverval = inverval / 1000000;
        mAverageFPS = (mAverageFPSFrameCount * 1000) / inverval;
        mAverageFPSFrameCount = 0;
        mAverageFPSStartTime = mTimeFrame;
    }
}

void Context::timerSet(Timers tm) {
    uint64_t last = mTimeLast;
    mTimeLast = getTime();
    mTimers[mTimerActive] += mTimeLast - last;
    mTimerActive = tm;
}

void Context::timerPrint() {
    double total = 0;
    for (int ct = 0; ct < _RS_TIMER_TOTAL; ct++) {
        total += mTimers[ct];
    }
    uint64_t frame = mTimeFrame - mTimeLastFrame;
    mTimeMSLastFrame = frame / 1000000;
    mTimeMSLastScript = mTimers[RS_TIMER_SCRIPT] / 1000000;
    mTimeMSLastSwap = mTimers[RS_TIMER_CLEAR_SWAP] / 1000000;


    if (props.mLogTimes) {
        LOGV("RS: Frame (%i),   Script %2.1f%% (%i),  Swap %2.1f%% (%i),  Idle %2.1f%% (%lli),  Internal %2.1f%% (%lli), Avg fps: %u",
             mTimeMSLastFrame,
             100.0 * mTimers[RS_TIMER_SCRIPT] / total, mTimeMSLastScript,
             100.0 * mTimers[RS_TIMER_CLEAR_SWAP] / total, mTimeMSLastSwap,
             100.0 * mTimers[RS_TIMER_IDLE] / total, mTimers[RS_TIMER_IDLE] / 1000000,
             100.0 * mTimers[RS_TIMER_INTERNAL] / total, mTimers[RS_TIMER_INTERNAL] / 1000000,
             mAverageFPS);
    }
}

bool Context::setupCheck() {

    mFragmentStore->setup(this, &mStateFragmentStore);
    mFragment->setup(this, &mStateFragment);
    mRaster->setup(this, &mStateRaster);
    mVertex->setup(this, &mStateVertex);
    mFBOCache.setup(this);
    return true;
}

void Context::setupProgramStore() {
    mFragmentStore->setup(this, &mStateFragmentStore);
}

static bool getProp(const char *str) {
    char buf[PROPERTY_VALUE_MAX];
    property_get(str, buf, "0");
    return 0 != strcmp(buf, "0");
}

void Context::displayDebugStats() {
    char buffer[128];
    sprintf(buffer, "Avg fps %u, Frame %i ms, Script %i ms", mAverageFPS, mTimeMSLastFrame, mTimeMSLastScript);
    float oldR, oldG, oldB, oldA;
    mStateFont.getFontColor(&oldR, &oldG, &oldB, &oldA);
    uint32_t bufferLen = strlen(buffer);

    ObjectBaseRef<Font> lastFont(getFont());
    setFont(NULL);
    float shadowCol = 0.1f;
    mStateFont.setFontColor(shadowCol, shadowCol, shadowCol, 1.0f);
    mStateFont.renderText(buffer, bufferLen, 5, getHeight() - 6);

    mStateFont.setFontColor(1.0f, 0.7f, 0.0f, 1.0f);
    mStateFont.renderText(buffer, bufferLen, 4, getHeight() - 7);

    setFont(lastFont.get());
    mStateFont.setFontColor(oldR, oldG, oldB, oldA);
}

void * Context::threadProc(void *vrsc) {
    Context *rsc = static_cast<Context *>(vrsc);
    rsc->mNativeThreadId = gettid();

    setpriority(PRIO_PROCESS, rsc->mNativeThreadId, ANDROID_PRIORITY_DISPLAY);
    rsc->mThreadPriority = ANDROID_PRIORITY_DISPLAY;

    rsc->props.mLogTimes = getProp("debug.rs.profile");
    rsc->props.mLogScripts = getProp("debug.rs.script");
    rsc->props.mLogObjects = getProp("debug.rs.object");
    rsc->props.mLogShaders = getProp("debug.rs.shader");
    rsc->props.mLogShadersAttr = getProp("debug.rs.shader.attributes");
    rsc->props.mLogShadersUniforms = getProp("debug.rs.shader.uniforms");
    rsc->props.mLogVisual = getProp("debug.rs.visual");

    if (!rsdHalInit(rsc, 0, 0)) {
        rsc->setError(RS_ERROR_FATAL_DRIVER, "Failed initializing GL");
        LOGE("Hal init failed");
        return NULL;
    }
    rsc->mHal.funcs.setPriority(rsc, rsc->mThreadPriority);

    if (rsc->mIsGraphicsContext) {
        if (!rsc->initGLThread()) {
            rsc->setError(RS_ERROR_OUT_OF_MEMORY, "Failed initializing GL");
            return NULL;
        }

        rsc->mStateRaster.init(rsc);
        rsc->setProgramRaster(NULL);
        rsc->mStateVertex.init(rsc);
        rsc->setProgramVertex(NULL);
        rsc->mStateFragment.init(rsc);
        rsc->setProgramFragment(NULL);
        rsc->mStateFragmentStore.init(rsc);
        rsc->setProgramStore(NULL);
        rsc->mStateFont.init(rsc);
        rsc->setFont(NULL);
        rsc->mFBOCache.init(rsc);
    }

    rsc->mRunning = true;
    bool mDraw = true;
    while (!rsc->mExit) {
        mDraw |= rsc->mIO.playCoreCommands(rsc, !mDraw);
        mDraw &= (rsc->mRootScript.get() != NULL);
        mDraw &= (rsc->mWndSurface != NULL);

        uint32_t targetTime = 0;
        if (mDraw && rsc->mIsGraphicsContext) {
            targetTime = rsc->runRootScript();

            if (rsc->props.mLogVisual) {
                rsc->displayDebugStats();
            }

            mDraw = targetTime && !rsc->mPaused;
            rsc->timerSet(RS_TIMER_CLEAR_SWAP);
            rsc->mHal.funcs.swap(rsc);
            rsc->timerFrame();
            rsc->timerSet(RS_TIMER_INTERNAL);
            rsc->timerPrint();
            rsc->timerReset();
        }
        if (targetTime > 1) {
            int32_t t = (targetTime - (int32_t)(rsc->mTimeMSLastScript + rsc->mTimeMSLastSwap)) * 1000;
            if (t > 0) {
                usleep(t);
            }
        }
    }

    LOGV("%p, RS Thread exiting", rsc);

    if (rsc->mIsGraphicsContext) {
        pthread_mutex_lock(&gInitMutex);
        rsc->deinitEGL();
        pthread_mutex_unlock(&gInitMutex);
    }

    LOGV("%p, RS Thread exited", rsc);
    return NULL;
}

void Context::destroyWorkerThreadResources() {
    //LOGV("destroyWorkerThreadResources 1");
    ObjectBase::zeroAllUserRef(this);
    if (mIsGraphicsContext) {
         mRaster.clear();
         mFragment.clear();
         mVertex.clear();
         mFragmentStore.clear();
         mFont.clear();
         mRootScript.clear();
         mStateRaster.deinit(this);
         mStateVertex.deinit(this);
         mStateFragment.deinit(this);
         mStateFragmentStore.deinit(this);
         mStateFont.deinit(this);
         mFBOCache.deinit(this);
    }
    //LOGV("destroyWorkerThreadResources 2");
    mExit = true;
}

void Context::setPriority(int32_t p) {
    // Note: If we put this in the proper "background" policy
    // the wallpapers can become completly unresponsive at times.
    // This is probably not what we want for something the user is actively
    // looking at.
    mThreadPriority = p;
#if 0
    SchedPolicy pol = SP_FOREGROUND;
    if (p > 0) {
        pol = SP_BACKGROUND;
    }
    if (!set_sched_policy(mNativeThreadId, pol)) {
        // success; reset the priority as well
    }
#else
    setpriority(PRIO_PROCESS, mNativeThreadId, p);
#endif
}

Context::Context() {
    mDev = NULL;
    mRunning = false;
    mExit = false;
    mPaused = false;
    mObjHead = NULL;
    mError = RS_ERROR_NONE;
    mDPI = 96;
}

Context * Context::createContext(Device *dev, const RsSurfaceConfig *sc) {
    Context * rsc = new Context();
    if (!rsc->initContext(dev, sc)) {
        delete rsc;
        return NULL;
    }
    return rsc;
}

bool Context::initContext(Device *dev, const RsSurfaceConfig *sc) {
    pthread_mutex_lock(&gInitMutex);

    dev->addContext(this);
    mDev = dev;
    if (sc) {
        mUserSurfaceConfig = *sc;
    } else {
        memset(&mUserSurfaceConfig, 0, sizeof(mUserSurfaceConfig));
    }

    mIsGraphicsContext = sc != NULL;

    int status;
    pthread_attr_t threadAttr;

    pthread_mutex_unlock(&gInitMutex);

    // Global init done at this point.

    status = pthread_attr_init(&threadAttr);
    if (status) {
        LOGE("Failed to init thread attribute.");
        return false;
    }

    mWndSurface = NULL;

    timerInit();
    timerSet(RS_TIMER_INTERNAL);

    status = pthread_create(&mThreadId, &threadAttr, threadProc, this);
    if (status) {
        LOGE("Failed to start rs context thread.");
        return false;
    }
    while (!mRunning && (mError == RS_ERROR_NONE)) {
        usleep(100);
    }

    if (mError != RS_ERROR_NONE) {
        LOGE("Errors during thread init");
        return false;
    }

    pthread_attr_destroy(&threadAttr);
    return true;
}

Context::~Context() {
    LOGV("Context::~Context");

    mIO.mToCore.flush();
    rsAssert(mExit);
    mExit = true;
    mPaused = false;
    void *res;

    mIO.shutdown();
    int status = pthread_join(mThreadId, &res);


    if (mHal.funcs.shutdownDriver) {
        mHal.funcs.shutdownDriver(this);
    }

    // Global structure cleanup.
    pthread_mutex_lock(&gInitMutex);
    if (mDev) {
        mDev->removeContext(this);
        mDev = NULL;
    }
    pthread_mutex_unlock(&gInitMutex);
    LOGV("Context::~Context done");
}

void Context::setSurface(uint32_t w, uint32_t h, ANativeWindow *sur) {
    rsAssert(mIsGraphicsContext);
    mHal.funcs.setSurface(this, w, h, sur);

    mWndSurface = sur;
    mWidth = w;
    mHeight = h;

    if (mWidth && mHeight) {
        mStateVertex.updateSize(this);
    }
}

void Context::pause() {
    rsAssert(mIsGraphicsContext);
    mPaused = true;
}

void Context::resume() {
    rsAssert(mIsGraphicsContext);
    mPaused = false;
}

void Context::setRootScript(Script *s) {
    rsAssert(mIsGraphicsContext);
    mRootScript.set(s);
}

void Context::setProgramStore(ProgramStore *pfs) {
    rsAssert(mIsGraphicsContext);
    if (pfs == NULL) {
        mFragmentStore.set(mStateFragmentStore.mDefault);
    } else {
        mFragmentStore.set(pfs);
    }
}

void Context::setProgramFragment(ProgramFragment *pf) {
    rsAssert(mIsGraphicsContext);
    if (pf == NULL) {
        mFragment.set(mStateFragment.mDefault);
    } else {
        mFragment.set(pf);
    }
}

void Context::setProgramRaster(ProgramRaster *pr) {
    rsAssert(mIsGraphicsContext);
    if (pr == NULL) {
        mRaster.set(mStateRaster.mDefault);
    } else {
        mRaster.set(pr);
    }
}

void Context::setProgramVertex(ProgramVertex *pv) {
    rsAssert(mIsGraphicsContext);
    if (pv == NULL) {
        mVertex.set(mStateVertex.mDefault);
    } else {
        mVertex.set(pv);
    }
}

void Context::setFont(Font *f) {
    rsAssert(mIsGraphicsContext);
    if (f == NULL) {
        mFont.set(mStateFont.mDefault);
    } else {
        mFont.set(f);
    }
}

void Context::assignName(ObjectBase *obj, const char *name, uint32_t len) {
    rsAssert(!obj->getName());
    obj->setName(name, len);
    mNames.add(obj);
}

void Context::removeName(ObjectBase *obj) {
    for (size_t ct=0; ct < mNames.size(); ct++) {
        if (obj == mNames[ct]) {
            mNames.removeAt(ct);
            return;
        }
    }
}

RsMessageToClientType Context::peekMessageToClient(size_t *receiveLen, uint32_t *subID, bool wait) {
    *receiveLen = 0;
    if (!wait && mIO.mToClient.isEmpty()) {
        return RS_MESSAGE_TO_CLIENT_NONE;
    }

    uint32_t bytesData = 0;
    uint32_t commandID = 0;
    const uint32_t *d = (const uint32_t *)mIO.mToClient.get(&commandID, &bytesData);
    *receiveLen = bytesData - sizeof(uint32_t);
    if (bytesData) {
        *subID = d[0];
    }
    return (RsMessageToClientType)commandID;
}

RsMessageToClientType Context::getMessageToClient(void *data, size_t *receiveLen, uint32_t *subID, size_t bufferLen, bool wait) {
    //LOGE("getMessageToClient %i %i", bufferLen, wait);
    *receiveLen = 0;
    if (!wait && mIO.mToClient.isEmpty()) {
        return RS_MESSAGE_TO_CLIENT_NONE;
    }

    //LOGE("getMessageToClient 2 con=%p", this);
    uint32_t bytesData = 0;
    uint32_t commandID = 0;
    const uint32_t *d = (const uint32_t *)mIO.mToClient.get(&commandID, &bytesData);
    //LOGE("getMessageToClient 3    %i  %i", commandID, bytesData);

    *receiveLen = bytesData - sizeof(uint32_t);
    *subID = d[0];

    //LOGE("getMessageToClient  %i %i", commandID, *subID);
    if (bufferLen >= (*receiveLen)) {
        memcpy(data, d+1, *receiveLen);
        mIO.mToClient.next();
        return (RsMessageToClientType)commandID;
    }
    return RS_MESSAGE_TO_CLIENT_RESIZE;
}

bool Context::sendMessageToClient(const void *data, RsMessageToClientType cmdID,
                                  uint32_t subID, size_t len, bool waitForSpace) const {
    //LOGE("sendMessageToClient %i %i %i %i", cmdID, subID, len, waitForSpace);
    if (cmdID == 0) {
        LOGE("Attempting to send invalid command 0 to client.");
        return false;
    }
    if (!waitForSpace) {
        if (!mIO.mToClient.makeSpaceNonBlocking(len + 12)) {
            // Not enough room, and not waiting.
            return false;
        }
    }
    //LOGE("sendMessageToClient 2");
    uint32_t *p = (uint32_t *)mIO.mToClient.reserve(len + sizeof(subID));
    p[0] = subID;
    if (len > 0) {
        memcpy(p+1, data, len);
    }
    mIO.mToClient.commit(cmdID, len + sizeof(subID));
    //LOGE("sendMessageToClient 3");
    return true;
}

void Context::initToClient() {
    while (!mRunning) {
        usleep(100);
    }
}

void Context::deinitToClient() {
    mIO.mToClient.shutdown();
}

void Context::setError(RsError e, const char *msg) const {
    mError = e;
    sendMessageToClient(msg, RS_MESSAGE_TO_CLIENT_ERROR, e, strlen(msg) + 1, true);
}


void Context::dumpDebug() const {
    LOGE("RS Context debug %p", this);
    LOGE("RS Context debug");

    LOGE(" RS width %i, height %i", mWidth, mHeight);
    LOGE(" RS running %i, exit %i, paused %i", mRunning, mExit, mPaused);
    LOGE(" RS pThreadID %li, nativeThreadID %i", mThreadId, mNativeThreadId);
}

///////////////////////////////////////////////////////////////////////////////////////////
//

namespace android {
namespace renderscript {

void rsi_ContextFinish(Context *rsc) {
}

void rsi_ContextBindRootScript(Context *rsc, RsScript vs) {
    Script *s = static_cast<Script *>(vs);
    rsc->setRootScript(s);
}

void rsi_ContextBindSampler(Context *rsc, uint32_t slot, RsSampler vs) {
    Sampler *s = static_cast<Sampler *>(vs);

    if (slot > RS_MAX_SAMPLER_SLOT) {
        LOGE("Invalid sampler slot");
        return;
    }

    s->bindToContext(&rsc->mStateSampler, slot);
}

void rsi_ContextBindProgramStore(Context *rsc, RsProgramStore vpfs) {
    ProgramStore *pfs = static_cast<ProgramStore *>(vpfs);
    rsc->setProgramStore(pfs);
}

void rsi_ContextBindProgramFragment(Context *rsc, RsProgramFragment vpf) {
    ProgramFragment *pf = static_cast<ProgramFragment *>(vpf);
    rsc->setProgramFragment(pf);
}

void rsi_ContextBindProgramRaster(Context *rsc, RsProgramRaster vpr) {
    ProgramRaster *pr = static_cast<ProgramRaster *>(vpr);
    rsc->setProgramRaster(pr);
}

void rsi_ContextBindProgramVertex(Context *rsc, RsProgramVertex vpv) {
    ProgramVertex *pv = static_cast<ProgramVertex *>(vpv);
    rsc->setProgramVertex(pv);
}

void rsi_ContextBindFont(Context *rsc, RsFont vfont) {
    Font *font = static_cast<Font *>(vfont);
    rsc->setFont(font);
}

void rsi_AssignName(Context *rsc, RsObjectBase obj, const char *name, uint32_t name_length) {
    ObjectBase *ob = static_cast<ObjectBase *>(obj);
    rsc->assignName(ob, name, name_length);
}

void rsi_ObjDestroy(Context *rsc, void *optr) {
    ObjectBase *ob = static_cast<ObjectBase *>(optr);
    rsc->removeName(ob);
    ob->decUserRef();
}

void rsi_ContextPause(Context *rsc) {
    rsc->pause();
}

void rsi_ContextResume(Context *rsc) {
    rsc->resume();
}

void rsi_ContextSetSurface(Context *rsc, uint32_t w, uint32_t h, ANativeWindow *sur, size_t sur_length) {
    rsc->setSurface(w, h, sur);
}

void rsi_ContextSetPriority(Context *rsc, int32_t p) {
    rsc->setPriority(p);
}

void rsi_ContextDump(Context *rsc, int32_t bits) {
    ObjectBase::dumpAll(rsc);
}

void rsi_ContextDestroyWorker(Context *rsc) {
    rsc->destroyWorkerThreadResources();;
}

void rsi_ContextDestroy(Context *rsc) {
    LOGV("rsContextDestroy %p", rsc);
    rsContextDestroyWorker(rsc);
    delete rsc;
    LOGV("rsContextDestroy 2 %p", rsc);
}

RsContext rsi_ContextCreate(RsDevice vdev, uint32_t version) {
    LOGV("rsContextCreate %p", vdev);
    Device * dev = static_cast<Device *>(vdev);
    Context *rsc = Context::createContext(dev, NULL);
    return rsc;
}

RsContext rsi_ContextCreateGL(RsDevice vdev, uint32_t version,
                            RsSurfaceConfig sc, uint32_t dpi) {
    LOGV("rsContextCreateGL %p", vdev);
    Device * dev = static_cast<Device *>(vdev);
    Context *rsc = Context::createContext(dev, &sc);
    rsc->setDPI(dpi);
    LOGV("rsContextCreateGL ret %p ", rsc);
    return rsc;
}

RsMessageToClientType rsi_ContextPeekMessage(Context *rsc,
                                           size_t * receiveLen, size_t receiveLen_length,
                                           uint32_t * subID, size_t subID_length, bool wait) {
    return rsc->peekMessageToClient(receiveLen, subID, wait);
}

RsMessageToClientType rsi_ContextGetMessage(Context *rsc, void * data, size_t data_length,
                                          size_t * receiveLen, size_t receiveLen_length,
                                          uint32_t * subID, size_t subID_length, bool wait) {
    rsAssert(subID_length == sizeof(uint32_t));
    rsAssert(receiveLen_length == sizeof(size_t));
    return rsc->getMessageToClient(data, receiveLen, subID, data_length, wait);
}

void rsi_ContextInitToClient(Context *rsc) {
    rsc->initToClient();
}

void rsi_ContextDeinitToClient(Context *rsc) {
    rsc->deinitToClient();
}

}
}

// Only to be called at a3d load time, before object is visible to user
// not thread safe
void rsaGetName(RsContext con, void * obj, const char **name) {
    ObjectBase *ob = static_cast<ObjectBase *>(obj);
    (*name) = ob->getName();
}