/*
 * Copyright (C) 2014-2024 Amlogic, Inc. All rights reserved.
 *
 * All information contained herein is Amlogic confidential.
 *
 * This software is provided to you pursuant to Software License Agreement
 * (SLA) with Amlogic Inc ("Amlogic"). This software may be used
 * only in accordance with the terms of this agreement.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification is strictly prohibited without prior written permission from
 * Amlogic.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
 * OWNER OR 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.
 */

#define LOG_TAG "SubtitleExternalDataSource"

#include "ExternalDataSource.h"

#include "IpcDataTypes.h"
#include "SubtitleLog.h"

namespace {
static inline unsigned int make32bitValue(const char *buffer) {
    return buffer[0] | buffer[1] << 8 | buffer[2] << 16 | buffer[3] << 24;
}

static inline std::shared_ptr<char> makeNewSpBuffer(const char *buffer, int size) {
    char *copyBuffer = new char[size];
    memcpy(copyBuffer, buffer, size);
    return std::shared_ptr<char>(copyBuffer, [](char *buf) { delete[] buf; });
}

}  // namespace

ExternalDataSource::ExternalDataSource() {
    SUBTITLE_LOGI_FUNC_IN();
    mDumpFd = -1;
    mSegment = std::shared_ptr<BufferSegment>(new BufferSegment());
}

ExternalDataSource::~ExternalDataSource(){SUBTITLE_LOGI_FUNC_IN();}

SubtitleIOType ExternalDataSource::type() {
    return E_SUBTITLE_FMQ;
}

bool ExternalDataSource::start() {
    mState = E_SOURCE_STARTED;
    return true;
}

bool ExternalDataSource::stop() {
    mState = E_SOURCE_STOPPED;
    mSegment->notifyExit();
    return true;
}

size_t ExternalDataSource::availableDataSize() {
    int size = 0;
    if (mSegment) size += mSegment->availableDataSize();
    if (mCurrentItem) size += mCurrentItem->getRemainSize();
    return size;
}

size_t ExternalDataSource::read(void *buffer, size_t size) {
    size_t read = 0;

    // Current design of Parser Read, do not need add lock protection.
    // because all the read, is in parser thread.
    // We only need add lock here, is for protect access the mCurrentItem's
    // member function multi-thread.
    // Current Impl do not need lock, if required, then redesign the SegmentBuffer.
    // std::unique_lock<std::mutex> autolock(mLock);

    // in case of applied size more than 1024*2, such as dvb subtitle,
    // and data process error for two reads.
    // so add until read applied data then exit.
    int retry = 3;
    while (read != size && mState == E_SOURCE_STARTED && retry-- > 0) {
        if (mCurrentItem && !mCurrentItem->isEmpty()) {
            read += mCurrentItem->read_l(((char *)buffer + read), size - read);
            if (read == size) break;
        } else {
            mCurrentItem = mSegment->pop();
        }
    }

    if (isSubtitleDumpAvailable()) {
        if (mDumpFd == -1) {
            mDumpFd = ::open(DUMP_DATA_FILE_PATH, O_RDWR | O_CREAT, 0666);
            SUBTITLE_LOGI("need dump Source: mDumpFd=%d %d", mDumpFd, errno);
        }

        if (mDumpFd > 0) {
            size_t ret = write(mDumpFd, buffer, size);
            if (ret != size) {
                SUBTITLE_LOGE("wrote %zu/%zu", ret, size);
            }
        }
    }

    return read;
}

int ExternalDataSource::onData(const char *buffer, int len) {
    if (!buffer) {
        SUBTITLE_LOGE("Wrong buffer");
        return -1;
    }
    if (len < 4) {
        SUBTITLE_LOGE("Wrong data size, len=%d", len);
        return -1;
    }

    auto type = make32bitValue(buffer);
    switch (type) {
        case eTypeSubtitleRenderTime: {
            static int count = 0;
            mRenderTimeUs =
                ((int64_t)make32bitValue(buffer + 8)) << 32 | make32bitValue(buffer + 4);
            if (count++ % 100 == 0) {
                // 100 times is around 4 seconds
                SUBTITLE_LOGI("mRenderTimeUs: counter=%d, renderPts=%" PRId64, count,
                              mRenderTimeUs);
            }
            break;
        }
        case eTypeSubtitleTotal: {
            mTotalSubtitle = make32bitValue(buffer + 4);
            SUBTITLE_LOGI("eTypeSubtitleTotal: totalSubtitle=%d", mTotalSubtitle);
            break;
        }
        case eTypeSubtitleStartPts: {
            mStartPts = ((int64_t)make32bitValue(buffer + 8)) << 32 | make32bitValue(buffer + 4);
            SUBTITLE_LOGI("eTypeSubtitleStartPts: startPts=%" PRId64, mStartPts);
            break;
        }
        case eTypeSubtitleType: {
            const auto oldType = mSubtitleType;
            mSubtitleType = make32bitValue(buffer + 4);
            if (oldType != mSubtitleType) {
                SUBTITLE_LOGI("eTypeSubtitleType: subtitleType changed from %d to %d", oldType,
                              mSubtitleType);
            }
            break;
        }
        case eTypeSubtitleData: {
            // Mute the log as so many
            // SUBTITLE_LOGI("eTypeSubtitleData: len-4=%d", len-4);
            if (mTotalSubtitle != -1 || mSubtitleType != -1) {
                mSegment->push(makeNewSpBuffer(buffer + 4, len - 4), len - 4);
            }
            break;
        }
        case eTypeSubtitleLangString:
            mLanguage = buffer + 4;
            SUBTITLE_LOGI("eTypeSubtitleLangString: lang=%s", mLanguage.c_str());
            break;
        case eTypeSubtitleTypeString:
            [[fallthrough]];
        case eTypeSubtitleResetServ:
            [[fallthrough]];
        case eTypeSubtitleExitServ:
            SUBTITLE_LOGI("unhandled_type: %s", buffer + 4);
            break;
        default: {
            SUBTITLE_LOGE("unknown_type: type=%x, len=%d", type, len);
            mSegment->push(makeNewSpBuffer(buffer, len), len);
            break;
        }
    }

    notifyInfoChange(type);
    return 0;
}

void ExternalDataSource::dump(int fd, const char *prefix) {
    dprintf(fd, "%s FastMessageQueueSource:\n", prefix);
    {
        std::unique_lock<std::mutex> autolock(mLock);
        for (auto it = mInfoListeners.begin(); it != mInfoListeners.end(); it++) {
            auto wk_listener = (*it);
            if (auto lstn = wk_listener.lock())
                dprintf(fd, "%s   InfoListener: %p\n", prefix, lstn.get());
        }
    }
    dprintf(fd, "%s   state:%d\n\n", prefix, mState);

    dprintf(fd, "%s   Total Subtitle Tracks: %d\n", prefix, mTotalSubtitle);
    dprintf(fd, "%s   Current Subtitle type: %d\n", prefix, mSubtitleType);
    dprintf(fd, "%s   VideoStart PTS       : %" PRId64 "\n", prefix, mStartPts);
    dprintf(fd, "%s   Current Video PTS    : %" PRId64 "\n", prefix, mRenderTimeUs);

    dprintf(fd, "\n%s   Current Unconsumed Data Size: %zu\n", prefix,
            mSegment->availableDataSize());
}

// Private
// ==========================
void ExternalDataSource::notifyInfoChange(int type) {
    if (mState == E_SOURCE_STOPPED) {
        SUBTITLE_LOGI("return as already stopped");
        return;
    }

    std::unique_lock<std::mutex> autolock(mLock);
    for (auto &it : mInfoListeners) {
        auto lstn = it.lock();
        if (!lstn) {
            SUBTITLE_LOGE("something may be wrong");
            continue;
        }
        switch (type) {
            case eTypeSubtitleRenderTime:
                lstn->onRenderTimeChanged(mRenderTimeUs);
                break;
            case eTypeSubtitleTotal:
                lstn->onSubtitleChanged(mTotalSubtitle);
                break;
            case eTypeSubtitleStartPts:
                lstn->onRenderStartTimestamp(mStartPts);
                break;
            case eTypeSubtitleType:
                lstn->onTypeChanged(mSubtitleType);
                break;
        }
    }
}