/*
   mkvmerge -- utility for splicing together matroska files
   from component media subtypes

   Distributed under the GPL
   see the file COPYING for details
   or visit http://www.gnu.org/copyleft/gpl.html

   helper functions that need libebml/libmatroska

   Written by Moritz Bunkus <moritz@bunkus.org>.
*/

#ifndef MTX_COMMON_EBML_H
#define MTX_COMMON_EBML_H

#include "common/common_pch.h"

#include <ebml/EbmlMaster.h>
#include <ebml/EbmlUnicodeString.h>

#include <matroska/KaxTracks.h>

using namespace libebml;
using namespace libmatroska;

#define can_be_cast(c, e) (dynamic_cast<c *>(e))

bool is_valid_utf8_string(const std::string &c);
UTFstring cstrutf8_to_UTFstring(const std::string &c);
std::string UTFstring_to_cstrutf8(const UTFstring &u);

int64_t kt_get_default_duration(KaxTrackEntry &track);
int64_t kt_get_number(KaxTrackEntry &track);
int64_t kt_get_uid(KaxTrackEntry &track);
std::string kt_get_codec_id(KaxTrackEntry &track);
int kt_get_max_blockadd_id(KaxTrackEntry &track);
std::string kt_get_language(KaxTrackEntry &track);

int kt_get_a_channels(KaxTrackEntry &track);
double kt_get_a_sfreq(KaxTrackEntry &track);
double kt_get_a_osfreq(KaxTrackEntry &track);
int kt_get_a_bps(KaxTrackEntry &track);

int kt_get_v_pixel_width(KaxTrackEntry &track);
int kt_get_v_pixel_height(KaxTrackEntry &track);

#define is_id(e, ref) (EbmlId(*e) == EBML_ID(ref))
#if !defined(EBML_INFO)
#define EBML_INFO(ref)  ref::ClassInfos
#endif
#if !defined(EBML_ID)
#define EBML_ID(ref)  ref::ClassInfos.GlobalId
#endif
#if !defined(EBML_ID_VALUE)
#define EBML_ID_VALUE(id)  id.Value
#endif
#if !defined(EBML_ID_LENGTH)
#define EBML_ID_LENGTH(id)  id.Length
#endif
#if !defined(EBML_CLASS_CONTEXT)
#define EBML_CLASS_CONTEXT(ref) ref::ClassInfos.Context
#endif
#if !defined(EBML_CLASS_CALLBACK)
#define EBML_CLASS_CALLBACK(ref)   ref::ClassInfos
#endif
#if !defined(EBML_CONTEXT)
#define EBML_CONTEXT(e)  e->Generic().Context
#endif
#if !defined(EBML_NAME)
#define EBML_NAME(e)  e->Generic().DebugName
#endif
#if !defined(EBML_INFO_ID)
#define EBML_INFO_ID(cb)      (cb).GlobalId
#endif
#if !defined(EBML_INFO_NAME)
#define EBML_INFO_NAME(cb)    (cb).DebugName
#endif
#if !defined(EBML_INFO_CONTEXT)
#define EBML_INFO_CONTEXT(cb) (cb).Context
#endif
#if !defined(EBML_SEM_UNIQUE)
#define EBML_SEM_UNIQUE(s)  (s).Unique
#endif
#if !defined(EBML_SEM_CONTEXT)
#define EBML_SEM_CONTEXT(s) (s).GetCallbacks.Context
#endif
#if !defined(EBML_SEM_CREATE)
#define EBML_SEM_CREATE(s)  (s).GetCallbacks.Create()
#endif
#if !defined(EBML_CTX_SIZE)
#define EBML_CTX_SIZE(c) (c).Size
#endif
#if !defined(EBML_CTX_IDX)
#define EBML_CTX_IDX(c,i)   (c).MyTable[(i)]
#endif
#if !defined(EBML_CTX_IDX_INFO)
#define EBML_CTX_IDX_INFO(c,i) (c).MyTable[(i)].GetCallbacks
#endif
#if !defined(EBML_CTX_IDX_ID)
#define EBML_CTX_IDX_ID(c,i)   (c).MyTable[(i)].GetCallbacks.GlobalId
#endif
#if !defined(INVALID_FILEPOS_T)
#define INVALID_FILEPOS_T 0
#endif

template <typename type>type &
GetEmptyChild(EbmlMaster &master) {
  EbmlElement *e;
  EbmlMaster *m;

  e = master.FindFirstElt(EBML_INFO(type), true);
  if ((m = dynamic_cast<EbmlMaster *>(e))) {
    while (m->ListSize() > 0) {
      delete (*m)[0];
      m->Remove(0);
    }
  }

  return *(static_cast<type *>(e));
}

template <typename type>type &
GetNextEmptyChild(EbmlMaster &master,
                  const type &past_elt) {
  EbmlMaster *m;
  EbmlElement *e = master.FindNextElt(past_elt, true);
  if ((m = dynamic_cast<EbmlMaster *>(e))) {
    while (m->ListSize() > 0) {
      delete (*m)[0];
      m->Remove(0);
    }
  }

  return *(static_cast<type *>(e));
}

template <typename type>type &
AddEmptyChild(EbmlMaster &master) {
  EbmlMaster *m;
  EbmlElement *e = new type;
  if ((m = dynamic_cast<EbmlMaster *>(e))) {
    while (m->ListSize() > 0) {
      delete (*m)[0];
      m->Remove(0);
    }
  }
  master.PushElement(*e);

  return *(static_cast<type *>(e));
}

template <typename T>
T *
FindChild(EbmlMaster const &m) {
  return static_cast<T *>(m.FindFirstElt(EBML_INFO(T)));
}

template <typename T>
T *
FindChild(EbmlElement const &e) {
  auto &m = dynamic_cast<EbmlMaster const &>(e);
  return static_cast<T *>(m.FindFirstElt(EBML_INFO(T)));
}

template <typename A> A*
FindChild(EbmlMaster const *m) {
  return static_cast<A *>(m->FindFirstElt(EBML_INFO(A)));
}

template <typename A> A*
FindChild(EbmlElement const *e) {
  auto m = dynamic_cast<EbmlMaster const *>(e);
  assert(m);
  return static_cast<A *>(m->FindFirstElt(EBML_INFO(A)));
}

template <typename A> A*
FindNextChild(EbmlMaster const *m,
              EbmlElement const *p) {
  return static_cast<A *>(m->FindNextElt(*p));
}

template <typename A> A*
FindNextChild(EbmlElement const *e,
              EbmlElement const *p) {
  auto m = dynamic_cast<EbmlMaster const *>(e);
  assert(m);
  return static_cast<A *>(m->FindNextElt(*p));
}

template<typename A> A &
GetChild(EbmlMaster *m) {
  return GetChild<A>(*m);
}

template <typename A>A &
GetFirstOrNextChild(EbmlMaster &master,
                    A *previous_child) {
  return !previous_child ? GetChild<A>(master) : GetNextChild<A>(master, *previous_child);
}

template <typename A>A &
GetFirstOrNextChild(EbmlMaster *master,
                    A *previous_child) {
  return !previous_child ? GetChild<A>(*master) : GetNextChild<A>(*master, *previous_child);
}

template<typename T>
EbmlMaster *
DeleteChildren(EbmlMaster *master) {
  for (auto idx = master->ListSize(); 0 < idx; --idx)
    if (dynamic_cast<T *>((*master)[idx - 1])) {
      delete (*master)[idx - 1];
      master->Remove(idx - 1);
    }

  return master;
}

template<typename T>
EbmlMaster &
DeleteChildren(EbmlMaster &master) {
  return *DeleteChildren<T>(&master);
}

template<typename T>
void
FixMandatoryElement(EbmlMaster &master) {
  auto &element = GetChild<T>(master);
  element.SetValue(element.GetValue());
}

template<typename Tfirst,
         typename Tsecond,
         typename... Trest>
void
FixMandatoryElement(EbmlMaster &master) {
  FixMandatoryElement<Tfirst>(master);
  FixMandatoryElement<Tsecond, Trest...>(master);
}

template<typename... Trest>
void
FixMandatoryElement(EbmlMaster *master) {
  if (!master)
    return;
  FixMandatoryElement<Trest...>(*master);
}

template<typename Telement,
         typename Tvalue = decltype(Telement().GetValue())>
Tvalue
FindChildValue(EbmlMaster &master,
               Tvalue const &default_value = Tvalue{}) {
  auto child = FindChild<Telement>(master);
  return child ? static_cast<Tvalue>(child->GetValue()) : default_value;
}

template<typename Telement,
         typename Tvalue = decltype(Telement().GetValue())>
Tvalue
FindChildValue(EbmlMaster *master,
               Tvalue const &default_value = Tvalue{}) {
  return FindChildValue<Telement>(*master, default_value);
}

template<typename T>
memory_cptr
FindChildValue(EbmlMaster &master,
               bool clone = true,
               typename std::enable_if< std::is_base_of<EbmlBinary, T>::value >::type * = nullptr) {
  auto child = FindChild<T>(master);
  return !child ? memory_cptr()
       : clone  ? memory_c::clone(child->GetBuffer(), child->GetSize())
       :          memory_cptr(new memory_c(child->GetBuffer(), child->GetSize(), false));
}

template<typename T>
memory_cptr
FindChildValue(EbmlMaster *master,
               bool clone = true,
               typename std::enable_if< std::is_base_of<EbmlBinary, T>::value >::type * = nullptr) {
  return FindChildValue<T>(*master, clone);
}

template<typename Telement>
decltype(Telement().GetValue())
GetChildValue(EbmlMaster &master) {
  return GetChild<Telement>(master).GetValue();
}

template<typename Telement>
decltype(Telement().GetValue())
GetChildValue(EbmlMaster *master) {
  return GetChild<Telement>(master).GetValue();
}

EbmlElement *empty_ebml_master(EbmlElement *e);
EbmlElement *create_ebml_element(const EbmlCallbacks &callbacks, const EbmlId &id);
EbmlMaster *sort_ebml_master(EbmlMaster *e);
void remove_voids_from_master(EbmlElement *element);
void move_children(EbmlMaster &source, EbmlMaster &destination);

const EbmlCallbacks *find_ebml_callbacks(const EbmlCallbacks &base, const EbmlId &id);
const EbmlCallbacks *find_ebml_callbacks(const EbmlCallbacks &base, const char *debug_name);
const EbmlCallbacks *find_ebml_parent_callbacks(const EbmlCallbacks &base, const EbmlId &id);
const EbmlSemantic *find_ebml_semantic(const EbmlCallbacks &base, const EbmlId &id);

EbmlElement *find_ebml_element_by_id(EbmlMaster *master, const EbmlId &id);

void fix_mandatory_elements(EbmlElement *master);

template<typename A> void
provide_default_for_child(EbmlMaster &master,
                          const UTFstring &default_value) {
  A &value = GetChild<A>(master);
  if (!value.GetValue().length())
    value.SetValue(default_value);
}

template<typename A> void
provide_default_for_child(EbmlMaster *master,
                          const UTFstring &default_value) {
  provide_default_for_child<A>(*master, default_value);
}

typedef std::shared_ptr<EbmlElement> ebml_element_cptr;
typedef std::shared_ptr<EbmlMaster> ebml_master_cptr;

template<typename T>
std::shared_ptr<T>
clone(T const &e) {
  return std::shared_ptr<T>{static_cast<T *>(e.Clone())};
}

template<typename T>
std::shared_ptr<T>
clone(T *e) {
  return clone(*e);
}

template <typename T>
std::shared_ptr<T>
clone(std::shared_ptr<T> const &e) {
  return clone(*e);
}

#endif // MTX_COMMON_EBML_H
