#include "muxer_file_muxer.h"
#include "../base/logger.h"
#include "../base/media_common.h"
#include <filesystem>
#include <sstream>
#include <iomanip>
#include <algorithm>

extern "C" {
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libavutil/time.h>
#include <libavutil/mathematics.h>
}

namespace av {
namespace muxer {

FileMuxer::FileMuxer() {
    AV_LOGGER_DEBUG("创建文件复用器");
    lastFlushTime_ = std::chrono::steady_clock::now();
}

FileMuxer::~FileMuxer() {
    close();
    AV_LOGGER_DEBUG("文件复用器已销毁");
}

ErrorCode FileMuxer::initialize(const MuxerParams& params) {
    if (params.type != MuxerType::FILE_MUXER) {
        AV_LOGGER_ERROR("参数类型不是文件复用器");
        return ErrorCode::INVALID_ARGUMENT;
    }
    
    fileMuxerParams_ = static_cast<const FileMuxerParams&>(params);
    
    if (!validateParams(fileMuxerParams_)) {
        return ErrorCode::INVALID_PARAMS;
    }
    
    // 设置输出文件
    if (!fileMuxerParams_.outputFile.empty()) {
        currentOutputFile_ = fileMuxerParams_.outputFile;
    } else {
        currentOutputFile_ = fileMuxerParams_.outputPath;
    }
    
    ErrorCode result = validateFilePath(currentOutputFile_);
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 设置分段
    if (fileMuxerParams_.enableSegmentation) {
        segmentationEnabled_ = true;
        if (fileMuxerParams_.segmentPattern.empty()) {
            // 生成默认分段模式
            std::filesystem::path path(currentOutputFile_);
            std::string stem = path.stem().string();
            std::string ext = path.extension().string();
            fileMuxerParams_.segmentPattern = stem + "_%03d" + ext;
        }
    }
    
    setState(MuxerState::INITIALIZED);
    AV_LOGGER_INFOF("文件复用器初始化成功: {}", currentOutputFile_);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::start() {
    if (getState() != MuxerState::INITIALIZED) {
        AV_LOGGER_ERROR("复用器状态无效，无法启动");
        return ErrorCode::INVALID_STATE;
    }
    
    ErrorCode result = setupOutput();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    result = writeHeader();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 启动写入线程
    shouldStopWriting_ = false;
    try {
        writeThread_ = std::thread(&FileMuxer::writeThreadFunc, this);
        setState(MuxerState::STARTED);
        
        fileStartTime_ = std::chrono::steady_clock::now();
        AV_LOGGER_INFO("文件复用器已启动");
        
        return ErrorCode::OK;
    } catch (const std::exception& e) {
        AV_LOGGER_ERRORF("启动写入线程失败: {}", e.what());
        return ErrorCode::THREAD_ERROR;
    }
}

ErrorCode FileMuxer::stop() {
    if (getState() != MuxerState::STARTED && getState() != MuxerState::PAUSED) {
        return ErrorCode::OK;
    }
    
    // 停止写入线程
    shouldStopWriting_ = true;
    queueCondition_.notify_all();
    
    if (writeThread_.joinable()) {
        writeThread_.join();
    }
    
    // 刷新剩余数据
    flush();
    
    // 写入文件尾
    ErrorCode result = writeTrailer();
    if (result != ErrorCode::OK) {
        AV_LOGGER_ERRORF("写入文件尾失败: {}", static_cast<int>(result));
    }
    
    setState(MuxerState::STOPPED);
    AV_LOGGER_INFO("文件复用器已停止");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::close() {
    stop();
    
    ErrorCode result = closeOutputFile();
    
    // 清空队列
    {
        std::lock_guard<std::mutex> lock(queueMutex_);
        while (!packetQueue_.empty()) {
            packetQueue_.pop();
        }
    }
    
    setState(MuxerState::IDLE);
    AV_LOGGER_INFO("文件复用器已关闭");
    
    return result;
}

ErrorCode FileMuxer::writePacket(AVPacket* packet) {
    if (!packet) {
        AV_LOGGER_ERROR("包指针为空");
        return ErrorCode::INVALID_ARGUMENT;
    }
    
    if (getState() != MuxerState::STARTED) {
        AV_LOGGER_ERROR("复用器未启动，无法写入包");
        return ErrorCode::INVALID_STATE;
    }
    
    // 检查队列大小
    {
        std::lock_guard<std::mutex> lock(queueMutex_);
        if (packetQueue_.size() >= MAX_QUEUE_SIZE) {
            AV_LOGGER_WARNING("包队列已满，丢弃包");
            {
                std::lock_guard<std::mutex> statsLock(statsMutex_);
                stats_.droppedPackets++;
            }
            return ErrorCode::QUEUE_FULL;
        }
    }
    
    // 复制包
    AVPacket* packetCopy = av_packet_alloc();
    if (!packetCopy) {
        AV_LOGGER_ERROR("分配包内存失败");
        return ErrorCode::OUT_OF_MEMORY;
    }
    
    int ret = av_packet_ref(packetCopy, packet);
    if (ret < 0) {
        av_packet_free(&packetCopy);
        AV_LOGGER_ERRORF("复制包失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    // 添加到队列
    auto queueItem = std::make_unique<PacketQueueItem>(packetCopy, packet->stream_index);
    
    {
        std::lock_guard<std::mutex> lock(queueMutex_);
        packetQueue_.push(std::move(queueItem));
        queuedPackets_++;
    }
    
    queueCondition_.notify_one();
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::writeFrame(AVFrame* frame, int streamIndex) {
    if (!frame) {
        AV_LOGGER_ERROR("帧指针为空");
        return ErrorCode::INVALID_ARGUMENT;
    }
    
    // 这里需要编码器将帧编码为包，然后调用writePacket
    // 由于这是复用器，通常接收已编码的包
    AV_LOGGER_WARNING("文件复用器不直接支持写入原始帧，请先编码为包");
    
    return ErrorCode::NOT_SUPPORTED;
}

ErrorCode FileMuxer::flush() {
    if (!formatCtx_) {
        return ErrorCode::OK;
    }
    
    std::lock_guard<std::mutex> lock(fileMutex_);
    
    int ret = av_write_frame(formatCtx_, nullptr); // 刷新
    if (ret < 0) {
        AV_LOGGER_ERRORF("刷新复用器失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    if (formatCtx_->pb) {
        avio_flush(formatCtx_->pb);
    }
    
    lastFlushTime_ = std::chrono::steady_clock::now();
    AV_LOGGER_DEBUG("复用器已刷新");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::addStream(const StreamInfo& streamInfo) {
    if (getState() != MuxerState::INITIALIZED) {
        AV_LOGGER_ERROR("只能在初始化状态下添加流");
        return ErrorCode::INVALID_STATE;
    }
    
    std::lock_guard<std::mutex> lock(streamsMutex_);
    
    // 检查流索引是否已存在
    auto it = std::find_if(streams_.begin(), streams_.end(),
                          [&streamInfo](const StreamInfo& info) {
                              return info.index == streamInfo.index;
                          });
    
    if (it != streams_.end()) {
        AV_LOGGER_ERRORF("流索引 {} 已存在", streamInfo.index);
        return ErrorCode::STREAM_EXISTS;
    }
    
    streams_.push_back(streamInfo);
    
    AV_LOGGER_INFOF("已添加流: 索引={}, 类型={}, 编解码器={}", 
                   streamInfo.index, static_cast<int>(streamInfo.type), 
                   streamInfo.codecName);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::setOutputFile(const std::string& filename) {
    if (getState() != MuxerState::IDLE && getState() != MuxerState::INITIALIZED) {
        AV_LOGGER_ERROR("无法在运行时更改输出文件");
        return ErrorCode::INVALID_STATE;
    }
    
    ErrorCode result = validateFilePath(filename);
    if (result != ErrorCode::OK) {
        return result;
    }
    
    currentOutputFile_ = filename;
    fileMuxerParams_.outputFile = filename;
    
    AV_LOGGER_INFOF("输出文件已设置为: {}", filename);
    
    return ErrorCode::OK;
}

std::string FileMuxer::getOutputFile() const {
    return currentOutputFile_;
}

int64_t FileMuxer::getCurrentFileSize() const {
    return currentFileSize_;
}

double FileMuxer::getCurrentDuration() const {
    auto now = std::chrono::steady_clock::now();
    return std::chrono::duration<double>(now - fileStartTime_).count();
}

ErrorCode FileMuxer::enableSegmentation(bool enable, int duration) {
    if (getState() == MuxerState::STARTED) {
        AV_LOGGER_ERROR("无法在运行时更改分段设置");
        return ErrorCode::INVALID_STATE;
    }
    
    segmentationEnabled_ = enable;
    fileMuxerParams_.enableSegmentation = enable;
    fileMuxerParams_.segmentDuration = duration;
    
    AV_LOGGER_INFOF("分段已{}: 时长={}秒", enable ? "启用" : "禁用", duration);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::forceNewSegment() {
    if (!segmentationEnabled_) {
        AV_LOGGER_ERROR("分段功能未启用");
        return ErrorCode::INVALID_STATE;
    }
    
    if (getState() != MuxerState::STARTED) {
        AV_LOGGER_ERROR("复用器未启动");
        return ErrorCode::INVALID_STATE;
    }
    
    return createNewSegment();
}

std::vector<std::string> FileMuxer::getSegmentFiles() const {
    return segmentFiles_;
}

ErrorCode FileMuxer::setFastStart(bool enable) {
    fileMuxerParams_.enableFastStart = enable;
    
    if (enable) {
        fileMuxerParams_.movFlags |= 0x01; // AVFMT_FLAG_FASTSTART
    } else {
        fileMuxerParams_.movFlags &= ~0x01;
    }
    
    AV_LOGGER_INFOF("快速开始已{}", enable ? "启用" : "禁用");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::setMovFlags(int flags) {
    fileMuxerParams_.movFlags = flags;
    AV_LOGGER_INFOF("MOV标志已设置为: 0x{:X}", flags);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::setupOutput() {
    // 分配格式上下文
    const char* formatName = fileMuxerParams_.format.empty() ? nullptr : fileMuxerParams_.format.c_str();
    const char* filename = currentOutputFile_.c_str();
    
    int ret = avformat_alloc_output_context2(&formatCtx_, nullptr, formatName, filename);
    if (ret < 0) {
        AV_LOGGER_ERRORF("分配输出格式上下文失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    if (!formatCtx_->oformat) {
        AV_LOGGER_ERROR("无法确定输出格式");
        return ErrorCode::FORMAT_NOT_SUPPORTED;
    }
    
    AV_LOGGER_INFOF("输出格式: {} ({})", formatCtx_->oformat->name, formatCtx_->oformat->long_name);
    
    // 设置流
    ErrorCode result = setupStreams();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 设置元数据
    for (const auto& meta : fileMuxerParams_.metadata) {
        av_dict_set(&formatCtx_->metadata, meta.first.c_str(), meta.second.c_str(), 0);
    }
    
    // 打开输出文件
    return openOutputFile();
}

ErrorCode FileMuxer::writeHeader() {
    if (!formatCtx_) {
        AV_LOGGER_ERROR("格式上下文未初始化");
        return ErrorCode::INVALID_STATE;
    }
    
    // 设置格式选项
    AVDictionary* options = nullptr;
    
    for (const auto& option : fileMuxerParams_.options) {
        av_dict_set(&options, option.first.c_str(), option.second.c_str(), 0);
    }
    
    // 设置MOV标志
    if (fileMuxerParams_.movFlags != 0) {
        av_dict_set_int(&options, "movflags", fileMuxerParams_.movFlags, 0);
    }
    
    // 写入文件头
    int ret = avformat_write_header(formatCtx_, &options);
    av_dict_free(&options);
    
    if (ret < 0) {
        AV_LOGGER_ERRORF("写入文件头失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    AV_LOGGER_INFO("文件头已写入");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::writeTrailer() {
    if (!formatCtx_) {
        return ErrorCode::OK;
    }
    
    std::lock_guard<std::mutex> lock(fileMutex_);
    
    int ret = av_write_trailer(formatCtx_);
    if (ret < 0) {
        AV_LOGGER_ERRORF("写入文件尾失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    AV_LOGGER_INFO("文件尾已写入");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::openOutputFile() {
    if (!formatCtx_) {
        return ErrorCode::INVALID_STATE;
    }
    
    // 检查是否需要覆盖文件
    if (!fileMuxerParams_.overwrite && std::filesystem::exists(currentOutputFile_)) {
        AV_LOGGER_ERRORF("文件已存在且不允许覆盖: {}", currentOutputFile_);
        return ErrorCode::FILE_EXISTS;
    }
    
    // 打开输出文件
    if (!(formatCtx_->oformat->flags & AVFMT_NOFILE)) {
        int ret = avio_open(&formatCtx_->pb, currentOutputFile_.c_str(), AVIO_FLAG_WRITE);
        if (ret < 0) {
            AV_LOGGER_ERRORF("打开输出文件失败: {} ({})", 
                           ffmpeg_utils::errorToString(ret), currentOutputFile_);
            return static_cast<ErrorCode>(ret);
        }
    }
    
    currentFileSize_ = 0;
    AV_LOGGER_INFOF("输出文件已打开: {}", currentOutputFile_);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::closeOutputFile() {
    if (!formatCtx_) {
        return ErrorCode::OK;
    }
    
    std::lock_guard<std::mutex> lock(fileMutex_);
    
    // 关闭文件
    if (formatCtx_->pb && !(formatCtx_->oformat->flags & AVFMT_NOFILE)) {
        avio_closep(&formatCtx_->pb);
    }
    
    // 释放格式上下文
    avformat_free_context(formatCtx_);
    formatCtx_ = nullptr;
    
    // 清理流映射
    streamMap_.clear();
    
    AV_LOGGER_INFO("输出文件已关闭");
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::createNewSegment() {
    if (!segmentationEnabled_) {
        return ErrorCode::OK;
    }
    
    // 写入当前段的尾部
    ErrorCode result = writeTrailer();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 关闭当前文件
    result = closeOutputFile();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 添加到段文件列表
    segmentFiles_.push_back(currentOutputFile_);
    
    // 生成新的段文件名
    currentSegmentIndex_++;
    currentOutputFile_ = generateSegmentFilename(currentSegmentIndex_);
    
    // 重新设置输出
    result = setupOutput();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    // 写入新段的头部
    result = writeHeader();
    if (result != ErrorCode::OK) {
        return result;
    }
    
    fileStartTime_ = std::chrono::steady_clock::now();
    
    AV_LOGGER_INFOF("创建新段: {}", currentOutputFile_);
    
    return ErrorCode::OK;
}

ErrorCode FileMuxer::setupStreams() {
    std::lock_guard<std::mutex> lock(streamsMutex_);
    
    for (const auto& streamInfo : streams_) {
        AVStream* stream = createAVStream(streamInfo);
        if (!stream) {
            AV_LOGGER_ERRORF("创建流失败: 索引={}", streamInfo.index);
            return ErrorCode::STREAM_CREATE_FAILED;
        }
        
        streamMap_[streamInfo.index] = stream;
    }
    
    AV_LOGGER_INFOF("已设置 {} 个流", streams_.size());
    
    return ErrorCode::OK;
}

AVStream* FileMuxer::createAVStream(const StreamInfo& streamInfo) {
    if (!formatCtx_) {
        return nullptr;
    }
    
    AVStream* stream = avformat_new_stream(formatCtx_, nullptr);
    if (!stream) {
        AV_LOGGER_ERROR("创建新流失败");
        return nullptr;
    }
    
    stream->id = streamInfo.index;
    stream->time_base = streamInfo.timeBase;
    
    // 设置编解码器参数
    AVCodecParameters* codecpar = stream->codecpar;
    codecpar->codec_id = streamInfo.codecId;
    codecpar->codec_type = (streamInfo.type == StreamType::VIDEO) ? AVMEDIA_TYPE_VIDEO : AVMEDIA_TYPE_AUDIO;
    
    if (streamInfo.type == StreamType::VIDEO) {
        codecpar->width = streamInfo.width;
        codecpar->height = streamInfo.height;
        codecpar->format = streamInfo.pixelFormat;
        codecpar->bit_rate = streamInfo.bitrate;
        
        // 设置帧率
        stream->avg_frame_rate = streamInfo.frameRate;
        stream->r_frame_rate = streamInfo.frameRate;
    } else if (streamInfo.type == StreamType::AUDIO) {
        codecpar->sample_rate = streamInfo.sampleRate;
        av_channel_layout_default(&codecpar->ch_layout, streamInfo.channels);
        codecpar->format = streamInfo.sampleFormat;
        codecpar->bit_rate = streamInfo.bitrate;
    }
    
    AV_LOGGER_INFOF("创建流成功: 索引={}, 类型={}", streamInfo.index, static_cast<int>(streamInfo.type));
    
    return stream;
}

ErrorCode FileMuxer::processPacket(AVPacket* packet) {
    if (!packet || !formatCtx_) {
        return ErrorCode::INVALID_ARGUMENT;
    }
    
    // 检查流索引
    auto it = streamMap_.find(packet->stream_index);
    if (it == streamMap_.end()) {
        AV_LOGGER_ERRORF("未找到流索引: {}", packet->stream_index);
        return ErrorCode::STREAM_NOT_FOUND;
    }
    
    // 检查是否需要创建新段
    if (shouldCreateNewSegment()) {
        ErrorCode result = createNewSegment();
        if (result != ErrorCode::OK) {
            return result;
        }
    }
    
    return writePacketInternal(packet);
}

ErrorCode FileMuxer::writePacketInternal(AVPacket* packet) {
    std::lock_guard<std::mutex> lock(fileMutex_);
    
    auto startTime = std::chrono::steady_clock::now();
    
    // 写入包
    int ret = av_interleaved_write_frame(formatCtx_, packet);
    if (ret < 0) {
        AV_LOGGER_ERRORF("写入包失败: {}", ffmpeg_utils::errorToString(ret));
        return static_cast<ErrorCode>(ret);
    }
    
    // 更新统计信息
    updateStats(packet);
    currentFileSize_ += packet->size;
    writtenPackets_++;
    
    // 更新平均写入时间
    auto endTime = std::chrono::steady_clock::now();
    double writeTime = std::chrono::duration<double, std::milli>(endTime - startTime).count();
    averageWriteTime_ = (averageWriteTime_ * 0.9) + (writeTime * 0.1);
    
    // 定期刷新
    if (!fileMuxerParams_.syncMode) {
        auto now = std::chrono::steady_clock::now();
        auto elapsed = std::chrono::duration<double>(now - lastFlushTime_).count();
        if (elapsed >= fileMuxerParams_.flushInterval) {
            flush();
        }
    }
    
    return ErrorCode::OK;
}

void FileMuxer::writeThreadFunc() {
    AV_LOGGER_INFO("写入线程已启动");
    
    while (!shouldStopWriting_) {
        std::unique_ptr<PacketQueueItem> item;
        
        // 从队列获取包
        {
            std::unique_lock<std::mutex> lock(queueMutex_);
            queueCondition_.wait(lock, [this] {
                return !packetQueue_.empty() || shouldStopWriting_;
            });
            
            if (shouldStopWriting_ && packetQueue_.empty()) {
                break;
            }
            
            if (!packetQueue_.empty()) {
                item = std::move(packetQueue_.front());
                packetQueue_.pop();
            }
        }
        
        if (item && item->packet) {
            ErrorCode result = processPacket(item->packet);
            if (result != ErrorCode::OK) {
                onError(result, "写入包失败");
            }
        }
    }
    
    // 处理剩余的包
    while (true) {
        std::unique_ptr<PacketQueueItem> item;
        
        {
            std::lock_guard<std::mutex> lock(queueMutex_);
            if (packetQueue_.empty()) {
                break;
            }
            item = std::move(packetQueue_.front());
            packetQueue_.pop();
        }
        
        if (item && item->packet) {
            processPacket(item->packet);
        }
    }
    
    AV_LOGGER_INFO("写入线程已退出");
}

std::string FileMuxer::generateSegmentFilename(int segmentIndex) {
    if (fileMuxerParams_.segmentPattern.empty()) {
        std::filesystem::path path(currentOutputFile_);
        std::string stem = path.stem().string();
        std::string ext = path.extension().string();
        
        std::ostringstream oss;
        oss << stem << "_" << std::setfill('0') << std::setw(3) << segmentIndex << ext;
        return oss.str();
    } else {
        char buffer[1024];
        snprintf(buffer, sizeof(buffer), fileMuxerParams_.segmentPattern.c_str(), segmentIndex);
        return std::string(buffer);
    }
}

bool FileMuxer::shouldCreateNewSegment() const {
    if (!segmentationEnabled_) {
        return false;
    }
    
    // 检查时长
    if (fileMuxerParams_.segmentDuration > 0) {
        double currentDuration = getCurrentDuration();
        if (currentDuration >= fileMuxerParams_.segmentDuration) {
            return true;
        }
    }
    
    // 检查文件大小
    if (fileMuxerParams_.maxFileSize > 0) {
        if (currentFileSize_ >= fileMuxerParams_.maxFileSize) {
            return true;
        }
    }
    
    return false;
}

ErrorCode FileMuxer::validateFilePath(const std::string& path) {
    if (path.empty()) {
        AV_LOGGER_ERROR("文件路径不能为空");
        return ErrorCode::INVALID_ARGUMENT;
    }
    
    try {
        std::filesystem::path filePath(path);
        
        // 检查父目录是否存在
        std::filesystem::path parentDir = filePath.parent_path();
        if (!parentDir.empty() && !std::filesystem::exists(parentDir)) {
            // 尝试创建目录
            std::filesystem::create_directories(parentDir);
        }
        
        // 检查文件扩展名
        std::string extension = filePath.extension().string();
        if (extension.empty()) {
            AV_LOGGER_WARNING("文件没有扩展名，可能导致格式检测问题");
        }
        
    } catch (const std::exception& e) {
        AV_LOGGER_ERRORF("文件路径验证失败: {}", e.what());
        return ErrorCode::INVALID_PATH;
    }
    
    return ErrorCode::OK;
}

bool FileMuxer::validateParams(const MuxerParams& params) {
    if (!AbstractMuxer::validateParams(params)) {
        return false;
    }
    
    const auto& fileParams = static_cast<const FileMuxerParams&>(params);
    
    if (fileParams.outputFile.empty() && fileParams.outputPath.empty()) {
        AV_LOGGER_ERROR("输出文件路径不能为空");
        return false;
    }
    
    if (fileParams.segmentDuration < 0) {
        AV_LOGGER_ERROR("分段时长不能为负数");
        return false;
    }
    
    if (fileParams.maxFileSize < 0) {
        AV_LOGGER_ERROR("最大文件大小不能为负数");
        return false;
    }
    
    if (fileParams.flushInterval <= 0) {
        AV_LOGGER_ERROR("刷新间隔必须大于0");
        return false;
    }
    
    return true;
}

// FileMuxerFactory 实现
std::unique_ptr<AbstractMuxer> FileMuxer::FileMuxerFactory::createMuxer(MuxerType type) {
    if (type == MuxerType::FILE_MUXER) {
        return std::make_unique<FileMuxer>();
    }
    
    return nullptr;
}

bool FileMuxer::FileMuxerFactory::isTypeSupported(MuxerType type) const {
    return type == MuxerType::FILE_MUXER;
}

std::vector<MuxerType> FileMuxer::FileMuxerFactory::getSupportedTypes() const {
    return {MuxerType::FILE_MUXER};
}

std::unique_ptr<FileMuxer> FileMuxer::FileMuxerFactory::createFileMuxer(const std::string& filename) {
    auto muxer = std::make_unique<FileMuxer>();
    
    FileMuxerParams params;
    params.outputFile = filename;
    params.format = AbstractMuxer::getFormatFromExtension(filename);
    
    ErrorCode result = muxer->initialize(params);
    if (result != ErrorCode::OK) {
        AV_LOGGER_ERRORF("创建文件复用器失败: {}", static_cast<int>(result));
        return nullptr;
    }
    
    return muxer;
}

std::unique_ptr<FileMuxer> FileMuxer::FileMuxerFactory::createSegmentedMuxer(const std::string& pattern, int duration) {
    auto muxer = std::make_unique<FileMuxer>();
    
    FileMuxerParams params;
    params.outputFile = pattern;
    params.enableSegmentation = true;
    params.segmentDuration = duration;
    params.segmentPattern = pattern;
    
    // 从模式中推断格式
    std::string firstFile = pattern;
    size_t pos = firstFile.find("%");
    if (pos != std::string::npos) {
        firstFile.replace(pos, firstFile.find('d', pos) - pos + 1, "001");
    }
    params.format = AbstractMuxer::getFormatFromExtension(firstFile);
    
    ErrorCode result = muxer->initialize(params);
    if (result != ErrorCode::OK) {
        AV_LOGGER_ERRORF("创建分段复用器失败: {}", static_cast<int>(result));
        return nullptr;
    }
    
    return muxer;
}

} // namespace muxer
} // namespace av