/*
Copyright (c) 2023 - 2026 Advanced Micro Devices, Inc. All rights reserved.

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

#pragma once

#include <stdint.h>
#include <mutex>
#include <vector>
#include <string>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <string.h>
#include <queue>
#include <stdexcept>
#include <exception>
#include <cstring>
#include <unordered_map>
#include <chrono>
#include <thread>
#include <ctime>
#include <time.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <hip/hip_runtime.h>
#include "rocdecode/rocdecode.h"
#include "rocdecode/rocparser.h"

#define ROCVIDEODEC_TOSTR(X) std::to_string(X)
#define ROCVIDEODEC_STR(X) std::string(X)

// Simple logging macros - format matches src/commons.h:
//   [0, Critical] filename:line: timestamp_us us: [pid:X tid:Y hashid:0xZZZZZ] func(): message
#define RocVideoDecCriticalLog(msg) \
    do { \
        struct timespec _ts_; \
        clock_gettime(CLOCK_MONOTONIC, &_ts_); \
        uint64_t _us_ = static_cast<uint64_t>(_ts_.tv_sec) * 1000000ULL + _ts_.tv_nsec / 1000ULL; \
        const char *_f_ = strrchr(__FILE__, '/'); \
        pid_t _tid_ = static_cast<pid_t>(syscall(SYS_gettid)); \
        std::ostringstream _htid_oss_; \
        _htid_oss_ << "0x" << std::hex << std::setw(5) << std::setfill('0') \
                  << (std::hash<std::thread::id>{}(std::this_thread::get_id()) & 0xFFFFF); \
        std::cerr << "[0, Critical] " << (_f_ ? _f_ + 1 : __FILE__) \
                  << ":" << __LINE__ << ": " << _us_ << " us: [pid:" \
                  << getpid() << " tid:" << _tid_ << " hashid:" << _htid_oss_.str() << "] " \
                  << __func__ << "(): " << (msg) << std::endl; \
    } while (0)

/*!
 * \file
 * \brief The AMD Video Decode Library.
 *
 * \defgroup group_amd_roc_video_dec rocDecode Video Decode: AMD Video Decode API
 * \brief AMD The rocDecode video decoder for AMD’s GPUs.
 */

#define MAX_FRAME_NUM       16

typedef int (ROCDECAPI *PFNRECONFIGUEFLUSHCALLBACK)(void *, uint32_t, void *);

typedef enum SeiAvcHevcPayloadType_enum {
    SEI_TYPE_TIME_CODE = 136,
    SEI_TYPE_USER_DATA_UNREGISTERED = 5
} SeiAvcHevcPayloadType;

typedef enum OutputSurfaceMemoryType_enum {
    OUT_SURFACE_MEM_DEV_INTERNAL = 0,      /**<  Internal interopped decoded surface memory(original mapped decoded surface) */
    OUT_SURFACE_MEM_DEV_COPIED = 1,        /**<  decoded output will be copied to a separate device memory (the user doesn't need to call release) **/
    OUT_SURFACE_MEM_HOST_COPIED = 2,        /**<  decoded output will be copied to a separate host memory (the user doesn't need to call release) **/
    OUT_SURFACE_MEM_NOT_MAPPED  = 3         /**< <  decoded output is not available (interop won't be used): useful for decode only performance app*/
} OutputSurfaceMemoryType;

inline int GetChromaPlaneCount(rocDecVideoSurfaceFormat surface_format) {
    int num_planes = 1;
    switch (surface_format) {
    case rocDecVideoSurfaceFormat_NV12:
    case rocDecVideoSurfaceFormat_P016:
    default:
        num_planes = 1;
        break;
    case rocDecVideoSurfaceFormat_YUV444:
    case rocDecVideoSurfaceFormat_YUV444_16Bit:
    case rocDecVideoSurfaceFormat_YUV420:
    case rocDecVideoSurfaceFormat_YUV420_16Bit:
    case rocDecVideoSurfaceFormat_YUV422:
    case rocDecVideoSurfaceFormat_YUV422_16Bit:
        num_planes = 2;
        break;
    }

    return num_planes;
};

inline float GetChromaHeightFactor(rocDecVideoSurfaceFormat surface_format) {
    float factor = 0.5;
    switch (surface_format) {
    case rocDecVideoSurfaceFormat_NV12:
    case rocDecVideoSurfaceFormat_P016:
    case rocDecVideoSurfaceFormat_YUV420:
    case rocDecVideoSurfaceFormat_YUV420_16Bit:
    default:
        factor = 0.5;
        break;
    case rocDecVideoSurfaceFormat_YUV422:
    case rocDecVideoSurfaceFormat_YUV422_16Bit:
    case rocDecVideoSurfaceFormat_YUV444:
    case rocDecVideoSurfaceFormat_YUV444_16Bit:
        factor = 1.0;
        break;
    }

    return factor;
};

class RocVideoDecodeException : public std::exception {
public:

    explicit RocVideoDecodeException(const std::string& message, const int err_code):_message(message), _err_code(err_code) {}
    explicit RocVideoDecodeException(const std::string& message):_message(message), _err_code(-1) {}
    virtual const char* what() const throw() override {
        return _message.c_str();
    }
    int Geterror_code() const { return _err_code; }
private:
    std::string _message;
    int _err_code;
};

#define ROCDEC_THROW(X, CODE) throw RocVideoDecodeException(" { " + std::string(__func__) + " } " + X , CODE);

#define ROCDEC_API_CALL( rocDecAPI )                                                                         \
    do {                                                                                                     \
        rocDecStatus error_code = rocDecAPI;                                                                 \
        if( error_code != ROCDEC_SUCCESS) {                                                                  \
            std::ostringstream error_log;                                                                    \
            error_log << #rocDecAPI << " returned " << rocDecGetErrorName(error_code) << " at " <<__FILE__ <<":" << __LINE__;\
            ROCDEC_THROW(error_log.str(), error_code); \
        }                                                                                                     \
    } while (0)

#define HIP_API_CALL( call )                                                                                  \
    do {                                                                                                      \
        hipError_t hip_status = call;                                                                         \
        if (hip_status != hipSuccess) {                                                                       \
            const char *sz_err_name = NULL;                                                                     \
            sz_err_name = hipGetErrorName(hip_status);                                                          \
            std::ostringstream error_log;                                                                     \
            error_log << "hip API error " << sz_err_name ;                                                      \
            ROCDEC_THROW(error_log.str(), hip_status);                   \
        }                                                                                                     \
    }                                                                                                         \
    while (0)

#define CHECK_ZERO(str, value)              \
    do {                                   \
        if (value == 0) {                  \
            RocVideoDecCriticalLog(ROCVIDEODEC_STR(str) + " is 0.");    \
        }                                  \
    } while (0)

struct Rect {
    int left;
    int top;
    int right;
    int bottom;
};

struct Dim {
    int w, h;
};

static inline int align(int value, int alignment) {
   return (value + alignment - 1) & ~(alignment - 1);
}

typedef struct DecFrameBuffer_ {
    uint8_t *frame_ptr;       /**< device memory pointer for the decoded frame */
    int64_t  pts;             /**<  timestamp for the decoded frame */
    int picture_index;         /**<  surface index for the decoded frame */
} DecFrameBuffer;


typedef struct OutputSurfaceInfoType {
    uint32_t output_width;                      /**< Output width of decoded surface*/
    uint32_t output_height;                     /**< Output height of decoded surface*/
    uint32_t output_pitch;                      /**< Output pitch in bytes of luma plane, chroma pitch can be inferred based on chromaFormat*/
    uint32_t output_vstride;                    /**< Output vertical stride in case of using internal mem pointer **/
    uint32_t chroma_height;                     /**< Chroma plane height **/
    Rect     disp_rect;                         /**< Display area **/
    uint32_t bytes_per_pixel;                   /**< Output BytesPerPixel of decoded image*/
    uint32_t bit_depth;                         /**< Output BitDepth of the image*/
    uint32_t num_chroma_planes;                 /**< Output Chroma number of planes*/
    uint64_t output_surface_size_in_bytes;      /**< Output Image Size in Bytes; including both luma and chroma planes*/
    rocDecVideoSurfaceFormat surface_format;    /**< Chroma format of the decoded image*/
    OutputSurfaceMemoryType mem_type;           /**< Output mem_type of the surface*/
} OutputSurfaceInfo;

typedef struct ReconfigParams_t {
    PFNRECONFIGUEFLUSHCALLBACK p_fn_reconfigure_flush;
    void *p_reconfig_user_struct;
    uint32_t reconfig_flush_mode;
} ReconfigParams;

class RocVideoDecoder {
    public:
        /**
        * @brief Construct a new Roc Video Decoder object
        * 
        * @param device_id : device_id to initialize HIP and VCN
        * @param out_mem_type : out_mem_type for the decoded surface
        * @param codec : codec type
        * @param force_zero_latency : to force zero latency (output in decoding orde)
        * @param p_crop_rect : to crop output
        * @param extract_user_SEI_Message : enable to extract SEI
        * @param disp_delay : output delayed by #disp_delay surfaces
        * @param max_width : Max. width for the output surface
        * @param max_height : Max. height for the output surface
        * @param clk_rate : FPS clock-rate
        */
        RocVideoDecoder(int device_id,  OutputSurfaceMemoryType out_mem_type, rocDecVideoCodec codec, bool force_zero_latency = false,
                          const Rect *p_crop_rect = nullptr, bool extract_user_SEI_Message = false, uint32_t disp_delay = 0, int max_width = 0, int max_height = 0,
                          uint32_t clk_rate = 1000, bool skip_init = false);

        virtual ~RocVideoDecoder();

        rocDecVideoCodec GetCodecId() { return codec_id_; }

        /**
         * @brief Get the output frame width
         */
        uint32_t GetWidth() {CHECK_ZERO("Display width", disp_width_); return disp_width_;}

        /**
        *  @brief  This function is used to get the actual decode width
        */
        int GetDecodeWidth() {CHECK_ZERO("Coded width", coded_width_); return coded_width_; }

        /**
         * @brief Get the output frame height
         */
        uint32_t GetHeight() {CHECK_ZERO("Display height", disp_height_); return disp_height_; }

        /**
        *  @brief  This function is used to get the current chroma height.
        */
        int GetChromaHeight() {CHECK_ZERO("Chroma height", chroma_height_); return chroma_height_; }

        /**
        *  @brief  This function is used to get the number of chroma planes.
        */
        int GetNumChromaPlanes() {return num_chroma_planes_; }

        /**
        *   @brief  This function is used to get the current frame size based on pixel format.
        */
        virtual int GetFrameSize() {CHECK_ZERO("Display width", disp_width_); return disp_width_ * (disp_height_ + (chroma_height_ * num_chroma_planes_)) * byte_per_pixel_; }


        /**
         * @brief Get the Bit Depth and BytesPerPixel associated with the pixel format
         * 
         * @return uint32_t 
         */
        uint32_t GetBitDepth() {return (bitdepth_minus_8_ + 8); }
        uint32_t GetBytePerPixel() {CHECK_ZERO("Bytes per pixel", byte_per_pixel_); return byte_per_pixel_; }
        /**
         * @brief Functions to get the output surface attributes
         */
        size_t GetSurfaceSize() {CHECK_ZERO("Surface size", surface_size_); return surface_size_; }
        uint32_t GetSurfaceStride() {CHECK_ZERO("Surface stride", surface_stride_); return surface_stride_; }
        //RocDecImageFormat GetSubsampling() { return subsampling_; }
        /**
         * @brief Get the name of the output format
         * 
         * @param codec_id 
         * @return std::string 
         */
        const char *GetCodecFmtName(rocDecVideoCodec codec_id);

        /**
         * @brief function to return the name from surface_format_id
         * 
         * @param surface_format_id - enum for surface format
         * @return const char* 
         */
        const char *GetSurfaceFmtName(rocDecVideoSurfaceFormat surface_format_id);

        /**
         * @brief Get the pointer to the Output Image Info 
         * 
         * @param surface_info ptr to output surface info 
         * @return true 
         * @return false 
         */
        virtual bool GetOutputSurfaceInfo(OutputSurfaceInfo **surface_info);

        /**
         * @brief Function to set the Reconfig Params object
         * 
         * @param p_reconfig_params: pointer to reconfig params struct
         * @return true : success
         * @return false : fail
         */
        bool SetReconfigParams(ReconfigParams *p_reconfig_params, bool b_force_reconfig_flush = false);
        
        /**
         * @brief Function to force Reconfigure Flush: needed for random seeking to key frames
         * 
         * @return int 1: Success 0: Fail
         */
        int FlushAndReconfigure();
        /**
         * @brief this function decodes a frame and returns the number of frames available for display
         * 
         * @param data - pointer to the data buffer that is to be decoded
         * @param size - size of the data buffer in bytes
         * @param pts - presentation timestamp
         * @param flags - video packet flags
         * @param num_decoded_pics - number of pictures decoded in this call
         * @return int - num of frames to display
         */
        virtual int DecodeFrame(const uint8_t *data, size_t size, int pkt_flags, int64_t pts = 0, int *num_decoded_pics = nullptr);
        /**
         * @brief This function returns a decoded frame and timestamp. This should be called in a loop fetching all the available frames
         * 
         */
        virtual uint8_t* GetFrame(int64_t *pts);

        /**
         * @brief function to release frame after use by the application: Only used with "OUT_SURFACE_MEM_DEV_INTERNAL"
         * 
         * @param pTimestamp - timestamp of the frame to be released (unmapped)
         * @param b_flushing - true when flushing
         * @return true      - success
         * @return false     - failed
         */
        virtual bool ReleaseFrame(int64_t pTimestamp, bool b_flushing = false);

        /**
         * @brief utility function to save image to a file
         * 
         * @param output_file_name - file to write
         * @param dev_mem - dev_memory pointer of the frame
         * @param image_info - output image info
         * @param is_output_RGB - to write in RGB
         */
        //void SaveImage(std::string output_file_name, void* dev_mem, OutputImageInfo* image_info, bool is_output_RGB = 0);

        /**
         * @brief Get the Device info for the current device
         * 
         * @param device_name
         * @param gcn_arch_name
         * @param pci_bus_id
         * @param pci_domain_id
         * @param pci_device_id
         */
        void GetDeviceinfo(std::string &device_name, std::string &gcn_arch_name, int &pci_bus_id, int &pci_domain_id, int &pci_device_id);
        
        /**
         * @brief Helper function to dump decoded output surface to file
         * 
         * @param output_file_name  - Output file name
         * @param dev_mem           - pointer to surface memory
         * @param surf_info         - surface info
         * @param rgb_image_size    - image size for rgb (optional). A non_zero value indicates the surf_mem holds an rgb interleaved image and the entire size will be dumped to file
         */
        virtual void SaveFrameToFile(std::string output_file_name, void *surf_mem, OutputSurfaceInfo *surf_info, size_t rgb_image_size = 0);

        /**
         * @brief Helper function to close an existing file and dump to new file in case of multiple files using same decoder
        */
        virtual void ResetSaveFrameToFile();

        /**
         * @brief Get the Num Of Flushed Frames from video decoder object
         * 
         * @return int32_t 
         */
        int32_t GetNumOfFlushedFrames() { return num_frames_flushed_during_reconfig_;}

        /*! \brief Function to wait for the decode completion of the last submitted picture
         */
        void WaitForDecodeCompletion();

        // Session overhead refers to decoder initialization and deinitialization time
        void AddDecoderSessionOverHead(std::thread::id session_id, double duration) { session_overhead_[session_id] += duration; }
        double GetDecoderSessionOverHead(std::thread::id session_id) {
            if (session_overhead_.find(session_id) != session_overhead_.end()) {
                return session_overhead_[session_id];
            } else {
                return 0;
            }
         }

        /**
         * @brief Check if the given Video Codec is supported on the given GPU
         * 
         * @return rocDecStatus 
         */
        bool CodecSupported(int device_id, rocDecVideoCodec codec_id, uint32_t bit_depth);

        /**
         *   @brief  This function reconfigure decoder if there is a change in sequence params.
         */
        virtual int ReconfigureDecoder(RocdecVideoFormat *p_video_format);

    protected:
        /**
         *   @brief  Callback function to be registered for getting a callback when decoding of sequence starts
         */
        static int ROCDECAPI HandleVideoSequenceProc(void *p_user_data, RocdecVideoFormat *p_video_format) { return ((RocVideoDecoder *)p_user_data)->HandleVideoSequence(p_video_format); }

        /**
         *   @brief  Callback function to be registered for getting a callback when a decoded frame is ready to be decoded
         */
        static int ROCDECAPI HandlePictureDecodeProc(void *p_user_data, RocdecPicParams *p_pic_params) { return ((RocVideoDecoder *)p_user_data)->HandlePictureDecode(p_pic_params); }

        /**
         *   @brief  Callback function to be registered for getting a callback when a decoded frame is available for display
         */
        static int ROCDECAPI HandlePictureDisplayProc(void *p_user_data, RocdecParserDispInfo *p_disp_info) { return ((RocVideoDecoder *)p_user_data)->HandlePictureDisplay(p_disp_info); }

        /**
         *   @brief  Callback function to be registered for getting a callback when all the unregistered user SEI Messages are parsed for a frame.
         */
        static int ROCDECAPI HandleSEIMessagesProc(void *p_user_data, RocdecSeiMessageInfo *p_sei_message_info) { return ((RocVideoDecoder *)p_user_data)->GetSEIMessage(p_sei_message_info); } 

        /**
         *   @brief  This function gets called when a sequence is ready to be decoded. The function also gets called
             when there is format change
        */
        int HandleVideoSequence(RocdecVideoFormat *p_video_format);

        /**
         *   @brief  This function gets called when a picture is ready to be decoded. rocDecDecodeFrame is called from this function
         *   to decode the picture
         */
        int HandlePictureDecode(RocdecPicParams *p_pic_params);

        /**
         *   @brief  This function gets called after a picture is decoded and available for display. Frames are fetched and stored in 
             internal buffer
        */
        int HandlePictureDisplay(RocdecParserDispInfo *p_disp_info);
        /**
         *   @brief  This function gets called when all unregistered user SEI messages are parsed for a frame
         */
        int GetSEIMessage(RocdecSeiMessageInfo *p_sei_message_info);
        
        /**
         * @brief function to release all internal frames and clear the vp_frames_q_ (used with reconfigure): Only used with "OUT_SURFACE_MEM_DEV_INTERNAL"
         * 
         * @return true      - success
         * @return false     - failed
         */
        bool ReleaseInternalFrames();

        /**
         * @brief Function to Initialize GPU-HIP
         * 
         */
        bool InitHIP(int device_id);

        /**
         * @brief Function to get start time
         * 
         */
        std::chrono::_V2::system_clock::time_point StartTimer();

        /**
         * @brief Function to get elapsed time
         * 
         */
        double StopTimer(const std::chrono::_V2::system_clock::time_point &start_time);

        int num_devices_;
        int device_id_;
        RocdecVideoParser rocdec_parser_ = nullptr;
        rocDecDecoderHandle roc_decoder_ = nullptr;
        OutputSurfaceMemoryType out_mem_type_ = OUT_SURFACE_MEM_DEV_INTERNAL;
        rocDecVideoCodec codec_id_ = rocDecVideoCodec_NumCodecs;
        bool b_force_zero_latency_ = false;
        bool b_extract_sei_message_ = false;
        uint32_t disp_delay_;
        ReconfigParams *p_reconfig_params_ = nullptr;
        bool b_force_recofig_flush_ = false;
        int32_t num_frames_flushed_during_reconfig_ = 0;
        hipDeviceProp_t hip_dev_prop_;
        hipStream_t hip_stream_ = nullptr;
        rocDecVideoChromaFormat video_chroma_format_ = rocDecVideoChromaFormat_420;
        rocDecVideoSurfaceFormat video_surface_format_ = rocDecVideoSurfaceFormat_NV12;
        RocdecSeiMessageInfo *curr_sei_message_ptr_ = nullptr;
        RocdecSeiMessageInfo sei_message_display_q_[MAX_FRAME_NUM];
        RocdecVideoFormat *curr_video_format_ptr_ = nullptr;
        int output_frame_cnt_ = 0, output_frame_cnt_ret_ = 0;
        int decoded_pic_cnt_ = 0;
        int decode_poc_ = 0, pic_num_in_dec_order_[MAX_FRAME_NUM];
        int num_alloced_frames_ = 0;
        int last_decode_surf_idx_ = 0;
        std::ostringstream input_video_info_str_;
        int bitdepth_minus_8_ = 0;
        uint32_t byte_per_pixel_ = 1;
        uint32_t coded_width_ = 0;
        uint32_t disp_width_ = 0;
        uint32_t coded_height_ = 0;
        uint32_t disp_height_ = 0;
        uint32_t target_width_ = 0;
        uint32_t target_height_ = 0;
        int max_width_ = 0, max_height_ = 0;
        uint32_t chroma_height_ = 0, chroma_width_ = 0;
        uint32_t num_decode_surfaces_ = 0;
        uint32_t num_chroma_planes_ = 0;
        uint32_t num_components_ = 0;
        uint32_t surface_stride_ = 0;
        uint32_t surface_vstride_ = 0, chroma_vstride_ = 0;      // vertical stride between planes: used when using internal dev memory
        size_t surface_size_ = 0;
        OutputSurfaceInfo output_surface_info_ = {};
        std::mutex mtx_vp_frame_;
        std::vector<DecFrameBuffer> vp_frames_;      // vector of decoded frames
        std::queue<DecFrameBuffer> vp_frames_q_;
        Rect disp_rect_ = {}; // displayable area specified in the bitstream
        Rect crop_rect_ = {}; // user specified region of interest within diplayable area disp_rect_
        FILE *fp_sei_ = NULL;
        FILE *fp_out_ = NULL;
        bool is_output_surface_changed_ = false;
        std::string current_output_filename = "";
        uint32_t extra_output_file_count_ = 0;
        std::thread::id decoder_session_id_; // Decoder session identifier. Used to gather session level stats.
        std::unordered_map<std::thread::id, double> session_overhead_; // Records session overhead of initialization+deinitialization time. Format is (thread id, duration)
};
