#include "decoder.hpp"

#include "../ffmpeg/bridge/cvbridge.hpp"
#include "../ffmpeg/format/FormatIn.hpp"
#include "../ffmpeg/data/CodedData.hpp"
#include "../ffmpeg/log/log.hpp"
#include "../common.hpp"

extern "C"{
#include <libavformat/avformat.h>
#include <libavutil/opt.h>
#include <libswscale/swscale.h>
#include <libavcodec/avcodec.h>
}

using namespace ffwrapper;
using namespace logif;

namespace cffmpeg_wrap
{
    decoder::decoder(ffwrapper::FormatIn *dec)
    :decRef_(dec)
    {}
    
    decoder::~decoder(){

        std::lock_guard<std::mutex> l(mutex_frm_);
        for(auto i : list_frm_){
            free(i.data);
        }
        list_frm_.clear();
    }

    int decoder::initDecoder(){
        if (!decRef_) return -1;

        if(decRef_->getCodecContext() == NULL){
                
            bool flag = true;
            flag = decRef_->openCodec(NULL);

            if (!flag){
                logIt("FormatIn openCodec Failed!");
                return -1;
            }
        }
        return 0;
    }

    int decoder::saveFrame(AVFrame *frame, const int64_t &id){
        FRM frm;
        frm.width = frame->width;
        frm.height = frame->height;
        frm.format = frame->format;
        frm.id = id;
        frm.data = cvbridge::extractFrame(frame, &frm.length);
        
        std::lock_guard<std::mutex> l(mutex_frm_);
        while(list_frm_.size() > 50){
            for(int i = 0; i < 12; i++){
                auto t = list_frm_.front();
                free(t.data);
                list_frm_.pop_front();
            }
        }
        if (!frm.data) return 0;
        list_frm_.push_back(frm);
        return list_frm_.size();   
    }

    int decoder::SetFrame(const CPacket &pkt){
        auto data = pkt.data;

        if (!data) return -10;
        if (!decRef_->isVideoPkt(&data->getAVPacket())) return -20;
        
        if (decRef_->getCodecContext() == NULL){
            if (initDecoder() != 0) return -30;
        }

        AVFrame *frame = av_frame_alloc();
        AVPacket np(data->getAVPacket());
        av_copy_packet(&np, &data->getAVPacket());
        auto ret = decRef_->decode(frame, &np);
        av_packet_unref(&np);
        
        if (ret == 0){
            saveFrame(frame, pkt.v_id);
        }
        av_frame_free(&frame);
        return ret;
    }

    void decoder::GetFrame(unsigned char **data, int *w, int *h, int *format, int *length, int64_t *id){

        std::lock_guard<std::mutex> l(mutex_frm_);
        if(list_frm_.empty()){
            *data = NULL;
            *w = *h = 0;
            *id = -1;
            return;
        }
        auto p = list_frm_.front();
        list_frm_.pop_front();
        *data = p.data;
        *id = p.id;
        *w = p.width;
        *h = p.height;
        *format = p.format;
        *length = p.length;
    }

} // namespace cffmpeg_wrap