/*
 * Copyright (C) 2009 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 "rsContext.h"
#include "rsScriptC.h"
#include "rsMatrix.h"
#include "utils/Timers.h"
#include "utils/StopWatch.h"
extern "C" {
#include "libdex/ZipArchive.h"
}

#include <GLES/gl.h>
#include <GLES/glext.h>

using namespace android;
using namespace android::renderscript;

#define GET_TLS()  Context::ScriptTLSStruct * tls = \
    (Context::ScriptTLSStruct *)pthread_getspecific(Context::gThreadTLSKey); \
    Context * rsc = tls->mContext; \
    ScriptC * sc = (ScriptC *) tls->mScript

// Input: cacheDir
// Input: resName
// Input: extName
//
// Note: cacheFile = resName + extName
//
// Output: Returns cachePath == cacheDir + cacheFile
char *genCacheFileName(const char *cacheDir,
                       const char *resName,
                       const char *extName) {
    char cachePath[512];
    char cacheFile[sizeof(cachePath)];
    const size_t kBufLen = sizeof(cachePath) - 1;

    cacheFile[0] = '\0';
    // Note: resName today is usually something like
    //       "/com.android.fountain:raw/fountain"
    if (resName[0] != '/') {
        // Get the absolute path of the raw/***.bc file.

        // Generate the absolute path.  This doesn't do everything it
        // should, e.g. if resName is "./out/whatever" it doesn't crunch
        // the leading "./" out because this if-block is not triggered,
        // but it'll make do.
        //
        if (getcwd(cacheFile, kBufLen) == NULL) {
            LOGE("Can't get CWD while opening raw/***.bc file\n");
            return NULL;
        }
        // Append "/" at the end of cacheFile so far.
        strncat(cacheFile, "/", kBufLen);
    }

    // cacheFile = resName + extName
    //
    strncat(cacheFile, resName, kBufLen);
    if (extName != NULL) {
        // TODO(srhines): strncat() is a bit dangerous
        strncat(cacheFile, extName, kBufLen);
    }

    // Turn the path into a flat filename by replacing
    // any slashes after the first one with '@' characters.
    char *cp = cacheFile + 1;
    while (*cp != '\0') {
        if (*cp == '/') {
            *cp = '@';
        }
        cp++;
    }

    // Tack on the file name for the actual cache file path.
    strncpy(cachePath, cacheDir, kBufLen);
    strncat(cachePath, cacheFile, kBufLen);

    LOGV("Cache file for '%s' '%s' is '%s'\n", resName, extName, cachePath);
    return strdup(cachePath);
}

ScriptC::ScriptC(Context *rsc) : Script(rsc) {
    LOGD(">>>> ScriptC ctor called, obj=%p", this);
    mBccScript = NULL;
    memset(&mProgram, 0, sizeof(mProgram));
}

ScriptC::~ScriptC() {
    LOGD(">>>> ~ScriptC() mBccScript = %p", mBccScript);
    if (mBccScript) {
        bccDisposeScript(mBccScript);
        LOGD(">>>> ~ScriptC(mBCCScript)");
    }
    free(mEnviroment.mScriptText);
    mEnviroment.mScriptText = NULL;
}

void ScriptC::setupScript(Context *rsc) {
    mEnviroment.mStartTimeMillis
                = nanoseconds_to_milliseconds(systemTime(SYSTEM_TIME_MONOTONIC));

    for (uint32_t ct=0; ct < mEnviroment.mFieldCount; ct++) {
        if (mSlots[ct].get() && !mTypes[ct].get()) {
            mTypes[ct].set(mSlots[ct]->getType());
        }

        if (!mTypes[ct].get())
            continue;
        void *ptr = NULL;
        if (mSlots[ct].get()) {
            ptr = mSlots[ct]->getPtr();
        }
        void **dest = ((void ***)mEnviroment.mFieldAddress)[ct];

        if (rsc->props.mLogScripts) {
            if (mSlots[ct].get() != NULL) {
                LOGV("%p ScriptC::setupScript slot=%i  dst=%p  src=%p  type=%p", rsc, ct, dest, ptr, mSlots[ct]->getType());
            } else {
                LOGV("%p ScriptC::setupScript slot=%i  dst=%p  src=%p  type=null", rsc, ct, dest, ptr);
            }
        }

        if (dest) {
            *dest = ptr;
        }
    }
}

const Allocation *ScriptC::ptrToAllocation(const void *ptr) const {
    if (!ptr) {
        return NULL;
    }
    for (uint32_t ct=0; ct < mEnviroment.mFieldCount; ct++) {
        if (!mSlots[ct].get())
            continue;
        if (mSlots[ct]->getPtr() == ptr) {
            return mSlots[ct].get();
        }
    }
    LOGE("ScriptC::ptrToAllocation, failed to find %p", ptr);
    return NULL;
}

Script * ScriptC::setTLS(Script *sc) {
    Context::ScriptTLSStruct * tls = (Context::ScriptTLSStruct *)
                                  pthread_getspecific(Context::gThreadTLSKey);
    rsAssert(tls);
    Script *old = tls->mScript;
    tls->mScript = sc;
    return old;
}

void ScriptC::setupGLState(Context *rsc) {
    if (mEnviroment.mFragmentStore.get()) {
        rsc->setProgramStore(mEnviroment.mFragmentStore.get());
    }
    if (mEnviroment.mFragment.get()) {
        rsc->setProgramFragment(mEnviroment.mFragment.get());
    }
    if (mEnviroment.mVertex.get()) {
        rsc->setProgramVertex(mEnviroment.mVertex.get());
    }
    if (mEnviroment.mRaster.get()) {
        rsc->setProgramRaster(mEnviroment.mRaster.get());
    }
}

uint32_t ScriptC::run(Context *rsc) {
    if (mProgram.mRoot == NULL) {
        rsc->setError(RS_ERROR_BAD_SCRIPT, "Attempted to run bad script");
        return 0;
    }

    setupGLState(rsc);
    setupScript(rsc);

    uint32_t ret = 0;
    Script * oldTLS = setTLS(this);

    if (rsc->props.mLogScripts) {
        LOGV("%p ScriptC::run invoking root,  ptr %p", rsc, mProgram.mRoot);
    }

    ret = mProgram.mRoot();

    if (rsc->props.mLogScripts) {
        LOGV("%p ScriptC::run invoking complete, ret=%i", rsc, ret);
    }

    setTLS(oldTLS);
    return ret;
}

typedef struct {
    Context *rsc;
    ScriptC *script;
    const Allocation * ain;
    Allocation * aout;
    const void * usr;

    uint32_t mSliceSize;
    volatile int mSliceNum;

    const uint8_t *ptrIn;
    uint32_t eStrideIn;
    uint8_t *ptrOut;
    uint32_t eStrideOut;

    uint32_t xStart;
    uint32_t xEnd;
    uint32_t yStart;
    uint32_t yEnd;
    uint32_t zStart;
    uint32_t zEnd;
    uint32_t arrayStart;
    uint32_t arrayEnd;

    uint32_t dimX;
    uint32_t dimY;
    uint32_t dimZ;
    uint32_t dimArray;
} MTLaunchStruct;
typedef int (*rs_t)(const void *, void *, const void *, uint32_t, uint32_t, uint32_t, uint32_t);

static void wc_xy(void *usr, uint32_t idx) {
    MTLaunchStruct *mtls = (MTLaunchStruct *)usr;

    while (1) {
        uint32_t slice = (uint32_t)android_atomic_inc(&mtls->mSliceNum);
        uint32_t yStart = mtls->yStart + slice * mtls->mSliceSize;
        uint32_t yEnd = yStart + mtls->mSliceSize;
        yEnd = rsMin(yEnd, mtls->yEnd);
        if (yEnd <= yStart) {
            return;
        }

        //LOGE("usr idx %i, x %i,%i  y %i,%i", idx, mtls->xStart, mtls->xEnd, yStart, yEnd);
        //LOGE("usr ptr in %p,  out %p", mtls->ptrIn, mtls->ptrOut);
        for (uint32_t y = yStart; y < yEnd; y++) {
            uint32_t offset = mtls->dimX * y;
            uint8_t *xPtrOut = mtls->ptrOut + (mtls->eStrideOut * offset);
            const uint8_t *xPtrIn = mtls->ptrIn + (mtls->eStrideIn * offset);

            for (uint32_t x = mtls->xStart; x < mtls->xEnd; x++) {
                ((rs_t)mtls->script->mProgram.mRoot) (xPtrIn, xPtrOut, mtls->usr, x, y, 0, 0);
                xPtrIn += mtls->eStrideIn;
                xPtrOut += mtls->eStrideOut;
            }
        }
    }
}

static void wc_x(void *usr, uint32_t idx) {
    MTLaunchStruct *mtls = (MTLaunchStruct *)usr;

    while (1) {
        uint32_t slice = (uint32_t)android_atomic_inc(&mtls->mSliceNum);
        uint32_t xStart = mtls->xStart + slice * mtls->mSliceSize;
        uint32_t xEnd = xStart + mtls->mSliceSize;
        xEnd = rsMin(xEnd, mtls->xEnd);
        if (xEnd <= xStart) {
            return;
        }

        //LOGE("usr idx %i, x %i,%i  y %i,%i", idx, mtls->xStart, mtls->xEnd, yStart, yEnd);
        //LOGE("usr ptr in %p,  out %p", mtls->ptrIn, mtls->ptrOut);
        uint8_t *xPtrOut = mtls->ptrOut + (mtls->eStrideOut * xStart);
        const uint8_t *xPtrIn = mtls->ptrIn + (mtls->eStrideIn * xStart);
        for (uint32_t x = xStart; x < xEnd; x++) {
            ((rs_t)mtls->script->mProgram.mRoot) (xPtrIn, xPtrOut, mtls->usr, x, 0, 0, 0);
            xPtrIn += mtls->eStrideIn;
            xPtrOut += mtls->eStrideOut;
        }
    }
}

void ScriptC::runForEach(Context *rsc,
                         const Allocation * ain,
                         Allocation * aout,
                         const void * usr,
                         const RsScriptCall *sc) {
    MTLaunchStruct mtls;
    memset(&mtls, 0, sizeof(mtls));
    Context::PushState ps(rsc);

    if (ain) {
        mtls.dimX = ain->getType()->getDimX();
        mtls.dimY = ain->getType()->getDimY();
        mtls.dimZ = ain->getType()->getDimZ();
        //mtls.dimArray = ain->getType()->getDimArray();
    } else if (aout) {
        mtls.dimX = aout->getType()->getDimX();
        mtls.dimY = aout->getType()->getDimY();
        mtls.dimZ = aout->getType()->getDimZ();
        //mtls.dimArray = aout->getType()->getDimArray();
    } else {
        rsc->setError(RS_ERROR_BAD_SCRIPT, "rsForEach called with null allocations");
        return;
    }

    if (!sc || (sc->xEnd == 0)) {
        mtls.xEnd = mtls.dimX;
    } else {
        rsAssert(sc->xStart < mtls.dimX);
        rsAssert(sc->xEnd <= mtls.dimX);
        rsAssert(sc->xStart < sc->xEnd);
        mtls.xStart = rsMin(mtls.dimX, sc->xStart);
        mtls.xEnd = rsMin(mtls.dimX, sc->xEnd);
        if (mtls.xStart >= mtls.xEnd) return;
    }

    if (!sc || (sc->yEnd == 0)) {
        mtls.yEnd = mtls.dimY;
    } else {
        rsAssert(sc->yStart < mtls.dimY);
        rsAssert(sc->yEnd <= mtls.dimY);
        rsAssert(sc->yStart < sc->yEnd);
        mtls.yStart = rsMin(mtls.dimY, sc->yStart);
        mtls.yEnd = rsMin(mtls.dimY, sc->yEnd);
        if (mtls.yStart >= mtls.yEnd) return;
    }

    mtls.xEnd = rsMax((uint32_t)1, mtls.xEnd);
    mtls.yEnd = rsMax((uint32_t)1, mtls.yEnd);
    mtls.zEnd = rsMax((uint32_t)1, mtls.zEnd);
    mtls.arrayEnd = rsMax((uint32_t)1, mtls.arrayEnd);

    rsAssert(ain->getType()->getDimZ() == 0);

    setupGLState(rsc);
    setupScript(rsc);
    Script * oldTLS = setTLS(this);

    mtls.rsc = rsc;
    mtls.ain = ain;
    mtls.aout = aout;
    mtls.script = this;
    mtls.usr = usr;
    mtls.mSliceSize = 10;
    mtls.mSliceNum = 0;

    mtls.ptrIn = NULL;
    mtls.eStrideIn = 0;
    if (ain) {
        mtls.ptrIn = (const uint8_t *)ain->getPtr();
        mtls.eStrideIn = ain->getType()->getElementSizeBytes();
    }

    mtls.ptrOut = NULL;
    mtls.eStrideOut = 0;
    if (aout) {
        mtls.ptrOut = (uint8_t *)aout->getPtr();
        mtls.eStrideOut = aout->getType()->getElementSizeBytes();
    }

    if ((rsc->getWorkerPoolSize() > 1) && mEnviroment.mIsThreadable) {
        if (mtls.dimY > 1) {
            rsc->launchThreads(wc_xy, &mtls);
        } else {
            rsc->launchThreads(wc_x, &mtls);
        }

        //LOGE("launch 1");
    } else {
        //LOGE("launch 3");
        for (uint32_t ar = mtls.arrayStart; ar < mtls.arrayEnd; ar++) {
            for (uint32_t z = mtls.zStart; z < mtls.zEnd; z++) {
                for (uint32_t y = mtls.yStart; y < mtls.yEnd; y++) {
                    uint32_t offset = mtls.dimX * mtls.dimY * mtls.dimZ * ar +
                                      mtls.dimX * mtls.dimY * z +
                                      mtls.dimX * y;
                    uint8_t *xPtrOut = mtls.ptrOut + (mtls.eStrideOut * offset);
                    const uint8_t *xPtrIn = mtls.ptrIn + (mtls.eStrideIn * offset);

                    for (uint32_t x = mtls.xStart; x < mtls.xEnd; x++) {
                        ((rs_t)mProgram.mRoot) (xPtrIn, xPtrOut, usr, x, y, z, ar);
                        xPtrIn += mtls.eStrideIn;
                        xPtrOut += mtls.eStrideOut;
                    }
                }
            }
        }
    }

    setTLS(oldTLS);
}

void ScriptC::Invoke(Context *rsc, uint32_t slot, const void *data, uint32_t len) {
    if ((slot >= mEnviroment.mInvokeFunctionCount) ||
        (mEnviroment.mInvokeFunctions[slot] == NULL)) {
        rsc->setError(RS_ERROR_BAD_SCRIPT, "Calling invoke on bad script");
        return;
    }
    setupScript(rsc);
    Script * oldTLS = setTLS(this);

    if (rsc->props.mLogScripts) {
        LOGV("%p ScriptC::Invoke invoking slot %i,  ptr %p", rsc, slot, mEnviroment.mInvokeFunctions[slot]);
    }
    ((void (*)(const void *, uint32_t))
        mEnviroment.mInvokeFunctions[slot])(data, len);
    if (rsc->props.mLogScripts) {
        LOGV("%p ScriptC::Invoke complete", rsc);
    }

    setTLS(oldTLS);
}

ScriptCState::ScriptCState() {
}

ScriptCState::~ScriptCState() {
}

static void* symbolLookup(void* pContext, char const* name) {
    const ScriptCState::SymbolTable_t *sym;
    ScriptC *s = (ScriptC *)pContext;
    if (!strcmp(name, "__isThreadable")) {
      return (void*) s->mEnviroment.mIsThreadable;
    } else if (!strcmp(name, "__clearThreadable")) {
      s->mEnviroment.mIsThreadable = false;
      return NULL;
    }
    sym = ScriptCState::lookupSymbol(name);
    if (!sym) {
        sym = ScriptCState::lookupSymbolCL(name);
    }
    if (!sym) {
        sym = ScriptCState::lookupSymbolGL(name);
    }
    if (sym) {
        s->mEnviroment.mIsThreadable &= sym->threadable;
        return sym->mPtr;
    }
    LOGE("ScriptC sym lookup failed for %s", name);
    return NULL;
}

#if 0
extern const char rs_runtime_lib_bc[];
extern unsigned rs_runtime_lib_bc_size;
#endif

bool ScriptCState::runCompiler(Context *rsc,
                               ScriptC *s,
                               const char *resName,
                               const char *cacheDir) {
    s->mBccScript = bccCreateScript();

    s->mEnviroment.mIsThreadable = true;

    if (bccRegisterSymbolCallback(s->mBccScript, symbolLookup, s) != 0) {
        LOGE("bcc: FAILS to register symbol callback");
        return false;
    }

    if (bccReadBC(s->mBccScript,
                  resName,
                  s->mEnviroment.mScriptText,
                  s->mEnviroment.mScriptTextLength, 0) != 0) {
        LOGE("bcc: FAILS to read bitcode");
        return false;
    }

#if 1
    if (bccLinkBC(s->mBccScript,
                  resName,
                  NULL /*rs_runtime_lib_bc*/,
                  1 /*rs_runtime_lib_bc_size*/
                    /*"1" means skip buffer here, and let libbcc decide*/,
                  0) != 0) {
        LOGE("bcc: FAILS to link bitcode");
        return false;
    }
#endif
    char *cachePath = genCacheFileName(cacheDir, resName, ".oBCC");

    if (bccPrepareExecutable(s->mBccScript, cachePath, 0) != 0) {
        LOGE("bcc: FAILS to prepare executable");
        return false;
    }

    free(cachePath);

    s->mProgram.mRoot = reinterpret_cast<int (*)()>(bccGetFuncAddr(s->mBccScript, "root"));
    s->mProgram.mInit = reinterpret_cast<void (*)()>(bccGetFuncAddr(s->mBccScript, "init"));

    if (s->mProgram.mInit) {
        s->mProgram.mInit();
    }

    s->mEnviroment.mInvokeFunctionCount = bccGetExportFuncCount(s->mBccScript);
    if (s->mEnviroment.mInvokeFunctionCount <= 0)
        s->mEnviroment.mInvokeFunctions = NULL;
    else {
        s->mEnviroment.mInvokeFunctions = (Script::InvokeFunc_t*) calloc(s->mEnviroment.mInvokeFunctionCount, sizeof(Script::InvokeFunc_t));
        bccGetExportFuncList(s->mBccScript, s->mEnviroment.mInvokeFunctionCount, (void **) s->mEnviroment.mInvokeFunctions);
    }

    s->mEnviroment.mFieldCount = bccGetExportVarCount(s->mBccScript);
    if (s->mEnviroment.mFieldCount <= 0)
        s->mEnviroment.mFieldAddress = NULL;
    else {
        s->mEnviroment.mFieldAddress = (void **) calloc(s->mEnviroment.mFieldCount, sizeof(void *));
        bccGetExportVarList(s->mBccScript, s->mEnviroment.mFieldCount, (void **) s->mEnviroment.mFieldAddress);
        s->initSlots();
    }

    s->mEnviroment.mFragment.set(rsc->getDefaultProgramFragment());
    s->mEnviroment.mVertex.set(rsc->getDefaultProgramVertex());
    s->mEnviroment.mFragmentStore.set(rsc->getDefaultProgramStore());
    s->mEnviroment.mRaster.set(rsc->getDefaultProgramRaster());

    const static int pragmaMax = 16;
    size_t pragmaCount = bccGetPragmaCount(s->mBccScript);
    char const *keys[pragmaMax];
    char const *values[pragmaMax];
    bccGetPragmaList(s->mBccScript, pragmaMax, keys, values);

    for (size_t i=0; i < pragmaCount; ++i) {
        //LOGE("pragma %s %s", keys[i], values[i]);
        if (!strcmp(keys[i], "version")) {
            if (!strcmp(values[i], "1")) {
                continue;
            }
            LOGE("Invalid version pragma value: %s\n", values[i]);
            return false;
        }

        if (!strcmp(keys[i], "stateVertex")) {
            if (!strcmp(values[i], "default")) {
                continue;
            }
            if (!strcmp(values[i], "parent")) {
                s->mEnviroment.mVertex.clear();
                continue;
            }
            LOGE("Unrecognized value %s passed to stateVertex", values[i]);
            return false;
        }

        if (!strcmp(keys[i], "stateRaster")) {
            if (!strcmp(values[i], "default")) {
                continue;
            }
            if (!strcmp(values[i], "parent")) {
                s->mEnviroment.mRaster.clear();
                continue;
            }
            LOGE("Unrecognized value %s passed to stateRaster", values[i]);
            return false;
        }

        if (!strcmp(keys[i], "stateFragment")) {
            if (!strcmp(values[i], "default")) {
                continue;
            }
            if (!strcmp(values[i], "parent")) {
                s->mEnviroment.mFragment.clear();
                continue;
            }
            LOGE("Unrecognized value %s passed to stateFragment", values[i]);
            return false;
        }

        if (!strcmp(keys[i], "stateStore")) {
            if (!strcmp(values[i], "default")) {
                continue;
            }
            if (!strcmp(values[i], "parent")) {
                s->mEnviroment.mFragmentStore.clear();
                continue;
            }
            LOGE("Unrecognized value %s passed to stateStore", values[i]);
            return false;
        }
    }
    return true;
}

namespace android {
namespace renderscript {

void rsi_ScriptCBegin(Context * rsc) {
}

void rsi_ScriptCSetText(Context *rsc, const char *text, uint32_t len) {
    ScriptCState *ss = &rsc->mScriptC;

    char *t = (char *)malloc(len + 1);
    memcpy(t, text, len);
    t[len] = 0;
    ss->mScriptText = t;
    ss->mScriptLen = len;
}


RsScript rsi_ScriptCCreate(Context *rsc,
                           const char *packageName /* deprecated */,
                           const char *resName,
                           const char *cacheDir)
{
    ScriptCState *ss = &rsc->mScriptC;

    ScriptC *s = new ScriptC(rsc);
    s->mEnviroment.mScriptText = ss->mScriptText;
    s->mEnviroment.mScriptTextLength = ss->mScriptLen;
    ss->mScriptText = NULL;
    ss->mScriptLen = 0;
    s->incUserRef();

    if (!ss->runCompiler(rsc, s, resName, cacheDir)) {
        // Error during compile, destroy s and return null.
        delete s;
        return NULL;
    }
    return s;
}

}
}