#include"Elf.h"
 
/**
 *  jichi 6/1/2014:
 *  Observations from 愛姉妹4
 *  - Scenario: arg1 + 4*5 is 0, arg1+0xc is address of the text
 *  - Character: arg1 + 4*10 is 0, arg1+0xc is text
 */
static inline size_t _elf_strlen(LPCSTR p) // limit search address which might be bad
{
  //CC_ASSERT(p);
  for (size_t i = 0; i < VNR_TEXT_CAPACITY; i++)
    if (!*p++)
      return i;
  return 0; // when len >= VNR_TEXT_CAPACITY
}

static void SpecialHookElf(hook_stack* stack,  HookParam *, uintptr_t *data, uintptr_t *split, size_t *len)
{
  //DWORD arg1 = *(DWORD *)(esp_base + 0x4);
  DWORD arg1 = stack->stack[1];
  DWORD arg2_scene = arg1 + 4*5,
        arg2_chara = arg1 + 4*10;
  DWORD text; //= 0; // This variable will be killed
  if (*(DWORD *)arg2_scene == 0) {
    text = *(DWORD *)(arg2_scene + 4*3);
    if (!text || ::IsBadReadPtr((LPCVOID)text, 1)) // Text from scenario could be bad when open backlog while the character is speaking
      return;
    *split = 1;
  } else if (*(DWORD *)arg2_chara == 0) {
    text = arg2_chara + 4*3;
    *split = 2;
  } else
    return;
  //if (text && text < MemDbg::UserMemoryStopAddress) {
  *len = _elf_strlen((LPCSTR)text); // in case the text is bad but still readable
  //*len = ::strlen((LPCSTR)text);
  *data = text;
}

/**
 *  jichi 5/31/2014: elf's
 *  Type1: SEXヂ�ーチャー剛史 trial, reladdr = 0x2f0f0, 2 parameters
 *  Type2: 愛姉妹4, reladdr = 0x2f9b0, 3 parameters
 *
 *  IDA: sub_42F9B0 proc near ; bp-based frame
 *    var_8 = dword ptr -8
 *    var_4 = byte ptr -4
 *    var_3 = word ptr -3
 *    arg_0 = dword ptr  8
 *    arg_4 = dword ptr  0Ch
 *    arg_8 = dword ptr  10h
 *
 *  Call graph (Type2):
 *  0x2f9b0 ;  hook here
 *  > 0x666a0 ; called multiple time
 *  > TextOutA ; there are two TextOutA, the second is the right one
 *
 *  Function starts (Type1), pattern offset: 0xc
 *  - 012ef0f0  /$ 55             push ebp ; jichi: hook
 *  - 012ef0f1  |. 8bec           mov ebp,esp
 *  - 012ef0f3  |. 83ec 10        sub esp,0x10
 *  - 012ef0f6  |. 837d 0c 00     cmp dword ptr ss:[ebp+0xc],0x0
 *  - 012ef0fa  |. 53             push ebx
 *  - 012ef0fb  |. 56             push esi
 *  - 012ef0fc  |. 75 0f          jnz short stt_tria.012ef10d ; jicchi: pattern starts
 *  - 012ef0fe  |. 8b45 08        mov eax,dword ptr ss:[ebp+0x8]
 *  - 012ef101  |. 8b48 04        mov ecx,dword ptr ds:[eax+0x4]
 *  - 012ef104  |. 8b91 90000000  mov edx,dword ptr ds:[ecx+0x90] ; jichi: pattern stops
 *  - 012ef10a  |. 8955 0c        mov dword ptr ss:[ebp+0xc],edx
 *  - 012ef10d  |> 8b4d 08        mov ecx,dword ptr ss:[ebp+0x8]
 *  - 012ef110  |. 8b51 04        mov edx,dword ptr ds:[ecx+0x4]
 *  - 012ef113  |. 33c0           xor eax,eax
 *  - 012ef115  |. c645 f8 00     mov byte ptr ss:[ebp-0x8],0x0
 *  - 012ef119  |. 66:8945 f9     mov word ptr ss:[ebp-0x7],ax
 *  - 012ef11d  |. 8b82 b0000000  mov eax,dword ptr ds:[edx+0xb0]
 *  - 012ef123  |. 8945 f4        mov dword ptr ss:[ebp-0xc],eax
 *  - 012ef126  |. 33db           xor ebx,ebx
 *  - 012ef128  |> 8b4f 20        /mov ecx,dword ptr ds:[edi+0x20]
 *  - 012ef12b  |. 83f9 10        |cmp ecx,0x10
 *
 *  Function starts (Type2), pattern offset: 0x10
 *  - 0093f9b0  /$ 55             push ebp  ; jichi: hook here
 *  - 0093f9b1  |. 8bec           mov ebp,esp
 *  - 0093f9b3  |. 83ec 08        sub esp,0x8
 *  - 0093f9b6  |. 837d 10 00     cmp dword ptr ss:[ebp+0x10],0x0
 *  - 0093f9ba  |. 53             push ebx
 *  - 0093f9bb  |. 8b5d 0c        mov ebx,dword ptr ss:[ebp+0xc]
 *  - 0093f9be  |. 56             push esi
 *  - 0093f9bf  |. 57             push edi
 *  - 0093f9c0  |. 75 0f          jnz short silkys.0093f9d1 ; jichi: pattern starts
 *  - 0093f9c2  |. 8b45 08        mov eax,dword ptr ss:[ebp+0x8]
 *  - 0093f9c5  |. 8b48 04        mov ecx,dword ptr ds:[eax+0x4]
 *  - 0093f9c8  |. 8b91 90000000  mov edx,dword ptr ds:[ecx+0x90] ; jichi: pattern stops
 *  - 0093f9ce  |. 8955 10        mov dword ptr ss:[ebp+0x10],edx
 *  - 0093f9d1  |> 33c0           xor eax,eax
 *  - 0093f9d3  |. c645 fc 00     mov byte ptr ss:[ebp-0x4],0x0
 *  - 0093f9d7  |. 66:8945 fd     mov word ptr ss:[ebp-0x3],ax
 *  - 0093f9db  |. 33ff           xor edi,edi
 *  - 0093f9dd  |> 8b53 20        /mov edx,dword ptr ds:[ebx+0x20]
 *  - 0093f9e0  |. 8d4b 0c        |lea ecx,dword ptr ds:[ebx+0xc]
 *  - 0093f9e3  |. 83fa 10        |cmp edx,0x10
 */
bool InsertElfHook()
{
  const BYTE bytes[] = {
      //0x55,                             // 0093f9b0  /$ 55             push ebp  ; jichi: hook here
      //0x8b,0xec,                        // 0093f9b1  |. 8bec           mov ebp,esp
      //0x83,0xec, 0x08,                  // 0093f9b3  |. 83ec 08        sub esp,0x8
      //0x83,0x7d, 0x10, 0x00,            // 0093f9b6  |. 837d 10 00     cmp dword ptr ss:[ebp+0x10],0x0
      //0x53,                             // 0093f9ba  |. 53             push ebx
      //0x8b,0x5d, 0x0c,                  // 0093f9bb  |. 8b5d 0c        mov ebx,dword ptr ss:[ebp+0xc]
      //0x56,                             // 0093f9be  |. 56             push esi
      //0x57,                             // 0093f9bf  |. 57             push edi
      0x75, 0x0f,                       // 0093f9c0  |. 75 0f          jnz short silkys.0093f9d1
      0x8b,0x45, 0x08,                  // 0093f9c2  |. 8b45 08        mov eax,dword ptr ss:[ebp+0x8]
      0x8b,0x48, 0x04,                  // 0093f9c5  |. 8b48 04        mov ecx,dword ptr ds:[eax+0x4]
      0x8b,0x91, 0x90,0x00,0x00,0x00    // 0093f9c8  |. 8b91 90000000  mov edx,dword ptr ds:[ecx+0x90]
  };
  //enum { addr_offset = 0xc };
  ULONG range = min(processStopAddress - processStartAddress, MAX_REL_ADDR);
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStartAddress + range);
  //GROWL_DWORD(addr);
  //addr = 0x42f170; // 愛姉妹4 Trial
  //reladdr = 0x2f9b0; // 愛姉妹4
  //reladdr = 0x2f0f0; // SEXヂ�ーチャー剛史 trial
  if (!addr) {
    ConsoleOutput("Elf: pattern not found");
    return false;
  }

  enum : BYTE { push_ebp = 0x55 };
  for (int i = 0; i < 0x20; i++, addr--) // value of i is supposed to be 0xc or 0x10
    if (*(BYTE *)addr == push_ebp) { // beginning of the function

      HookParam hp;
      hp.address = addr;
      hp.text_fun = SpecialHookElf;
      hp.type = USING_STRING|NO_CONTEXT; // = 9

      ConsoleOutput("INSERT Elf");
      
      return NewHook(hp, "Elf");
    }
  ConsoleOutput("Elf: function not found");
  return false;
}
namespace{
  bool __(){
    const BYTE bytes[] = {
      //姫騎士オリヴィア ～へ、変態、この変態男!少しは恥を知りなさい!～ 
      //女系家族III～秘密HIMITSU卑蜜～
      //ベロちゅー！～コスプレメイドをエロメロしちゃう魔法の舌戯～
        0x0F,0xB7,XX,XX4, //v11 == 30081 // movzx   edx, ds:word_4C285C //word_4C285C dw 7581h 
    };
    
    for (auto addr : Util::SearchMemory(bytes, sizeof(bytes), PAGE_EXECUTE, processStartAddress, processStopAddress)) {
      BYTE reg=*(BYTE*)(addr+2);
      if((reg!=0x05)&&(reg!=0x0d)&&(reg!=0x1d)&&(reg!=0x15))continue;
      int word_4C285C_addr=*(int*)(addr+3);
      if(word_4C285C_addr<processStartAddress || word_4C285C_addr>processStopAddress)continue;
      int word_4C285C=*(int*)word_4C285C_addr;
      if((word_4C285C)!=0x7581)continue;
      addr = findfuncstart(addr, 0x200);
      if (addr == 0)continue;
      HookParam hp;
      hp.address = addr;
      hp.offset=get_stack(1);
      hp.type = USING_STRING;
      
      return NewHook(hp, "aiwin6");
    }
     
    return  false;
  }
}
namespace { // unnamed
namespace ScenarioHook {
namespace Private {

  struct TextArgument
  {
    DWORD _unknown1[5];

    DWORD scenarioFlag;  // +4*5, 0 if it is scenario
    DWORD _unknown2[2];
    LPCSTR scenarioText; // +4*5+4*3, could be bad address though
    DWORD _unknown3;

    DWORD nameFlag;      // +4*10, 0 if it is name
    DWORD _unknown4[2];
    char nameText[1];    // +4*10+4*3, could be bad address though
  };

  std::string data_;
  TextArgument *scenarioArg_,
               *nameArg_;
  LPCSTR scenarioText_;

  enum { MaxNameSize = 100 };
  char nameText_[MaxNameSize + 1];

  bool hookBefore(hook_stack*s,void* data, size_t* len,uintptr_t*role)
  {
    auto arg = (TextArgument *)s->stack[0]; // arg1 on the top of the stack
    
    // Scenario
    if (arg->scenarioFlag == 0) {
      * role = Engine::ScenarioRole ;
      // Text from scenario could be bad when open backlog while the character is speaking
      auto text = arg->scenarioText;
      if (!Engine::isAddressReadable(text))
        return 0;
      return write_string_overwrite(data,len,text);
      // data_ = q->dispatchTextASTD(text, role, sig);
      // scenarioArg_ = arg;
      // scenarioText_ = arg->scenarioText;
      // arg->scenarioText = (LPCSTR)data_.c_str();
    } else if (arg->nameFlag == 0) {
      * role = Engine::NameRole;
      auto text = arg->nameText; 
      return write_string_overwrite(data,len,text);
      //  ::memcpy(text, newData.constData(), qMin(oldData.size(), newData.size()));
      //int left = oldData.size() - newData.size();
      //if (left > 0)
      //  ::memset(text + oldData.size() - left, 0, left);
    }
    return 0;
  }
  void hookafter1(hook_stack*s,void* data1, size_t len){
    auto newData=std::string((char*)data1,len);
    auto arg = (TextArgument *)s->stack[0]; // arg1 on the top of the stack
    
    // Scenario
    if (arg->scenarioFlag == 0) {
      
      auto text = arg->scenarioText;
      if (!Engine::isAddressReadable(text))
        return  ; 
      data_ = newData;
      scenarioArg_ = arg;
      scenarioText_ = arg->scenarioText;
      arg->scenarioText = (LPCSTR)data_.c_str();
    } else if (arg->nameFlag == 0) {
      
      auto text = arg->nameText; 
       std::string oldData=text;
       ::memcpy(text, newData.c_str(), min(oldData.size(), newData.size()));
      int left = oldData.size() - newData.size();
      if (left > 0)
       ::memset(text + oldData.size() - left, 0, left);
    }
  }
  bool hookAfter(hook_stack*s,void* data, size_t* len,uintptr_t*role)
  {
    if (scenarioArg_) {
      scenarioArg_->scenarioText = scenarioText_;
      scenarioArg_ = nullptr;
    }
    if (nameArg_) {
      ::strcpy(nameArg_->nameText, nameText_);
      nameArg_ = nullptr;
    }
    return 0;
  }

} // namespace Private

/**
 *  jichi 5/31/2014: elf's
 *  Type1: SEXティーチャー剛史 trial, reladdr = 0x2f0f0, 2 parameters
 *  Type2: 愛姉妹4, reladdr = 0x2f9b0, 3 parameters
 *
 *  The hooked function is the caller of the caller of TextOutA.
 */
bool attach(ULONG startAddress, ULONG stopAddress)
{
  const uint8_t bytes[] = {
      //0x55,                             // 0093f9b0  /$ 55             push ebp  ; jichi: hook here
      //0x8b,0xec,                        // 0093f9b1  |. 8bec           mov ebp,esp
      //0x83,0xec, 0x08,                  // 0093f9b3  |. 83ec 08        sub esp,0x8
      //0x83,0x7d, 0x10, 0x00,            // 0093f9b6  |. 837d 10 00     cmp dword ptr ss:[ebp+0x10],0x0
      //0x53,                             // 0093f9ba  |. 53             push ebx
      //0x8b,0x5d, 0x0c,                  // 0093f9bb  |. 8b5d 0c        mov ebx,dword ptr ss:[ebp+0xc]
      //0x56,                             // 0093f9be  |. 56             push esi
      //0x57,                             // 0093f9bf  |. 57             push edi
      0x75, 0x0f,                       // 0093f9c0  |. 75 0f          jnz short silkys.0093f9d1
      0x8b,0x45, 0x08,                  // 0093f9c2  |. 8b45 08        mov eax,dword ptr ss:[ebp+0x8]
      0x8b,0x48, 0x04,                  // 0093f9c5  |. 8b48 04        mov ecx,dword ptr ds:[eax+0x4]
      0x8b,0x91, 0x90,0x00,0x00,0x00    // 0093f9c8  |. 8b91 90000000  mov edx,dword ptr ds:[ecx+0x90]
  };
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), startAddress, stopAddress);
  if (!addr)
    return false;
  addr = MemDbg::findEnclosingAlignedFunction(addr);
  if (!addr)
    return false;
  int count = 0;
  auto fun = [&count](ULONG addr) -> bool {
    bool succ=false;
    HookParam hp;
    hp.address=addr;
    hp.hook_before=Private::hookBefore;
    hp.hook_after=Private::hookafter1;
    hp.type=USING_STRING|EMBED_ABLE|EMBED_DYNA_SJIS; 
    hp.hook_font=F_TextOutA;
    succ|=NewHook(hp,"EmbedElf");
    hp.address=addr+5;
    hp.hook_before=Private::hookAfter;
    succ|=NewHook(hp,"EmbedElf");
    count+=1;
    return succ; // replace all functions 
  };
  MemDbg::iterNearCallAddress(fun, addr, startAddress, stopAddress); 
  return count;

  //lastCaller = MemDbg::findEnclosingAlignedFunction(lastCaller);
  //Private::attached_ = false;
  //return winhook::hook_before(lastCaller, [=](winhook::hook_stack *s) -> bool {
  //  if (Private::attached_)
  //    return true;
  //  Private::attached_ = true;
  //  if (ULONG addr = MemDbg::findEnclosingAlignedFunction(s->stack[0])) {
  //    DOUT("dynamic pattern found");
  //    Private::oldHookFun = (Private::hook_fun_t)winhook::replace_fun(addr, (ULONG)Private::newHookFun);
  //  }
  //  return true;
  //});
}

} // namespace ScenarioHook
} // unnamed namespace
namespace{ 
//flutter of birds～鳥達の羽ばたき～
//https://vndb.org/v2379
//需要注意的是，不能把文本跳到最快，不然2~4行无法显示。
  bool elf3(){
    bool succ=false;
    BYTE sig[]={
      0x83,XX,0x14,0x10,
      0x72,XX
    };
    for(auto addr:Util::SearchMemory(sig,sizeof(sig),PAGE_EXECUTE,processStartAddress,processStopAddress)){
      auto check1=*(BYTE*)(addr+5);
      if(check1!=0x02 && check1!=0x04)continue;
      auto check=*(BYTE*)(addr+1);
      HookParam hp;
      hp.address=addr;
      hp.user_value=check;
      hp.type=USING_STRING|NO_CONTEXT;
      hp.text_fun=[](hook_stack* stack,  HookParam *hp, uintptr_t *data, uintptr_t *split, size_t *len){
        DWORD ptr;
        switch (hp->user_value)
        {
        case 0x7a:
          ptr=stack->edx;
          break;
        case 0x7b:
          ptr=stack->ebx;
          break;
        case 0x79:
          ptr=stack->ecx;
          break;
        case 0x78:
          ptr=stack->eax;
          break;
        case 0x7e:
          ptr=stack->esi;
          break;
        case 0x7f:
          ptr=stack->edi;
          break;
        case 0x7d:
          ptr=stack->ebp;
          break;
          //esp:
          //83 7c 24 14 10 
        default:
          hp->type=HOOK_EMPTY;
          break;
        }
        auto text=  (TextUnionA*)ptr;   
        *data=(DWORD)text->getText();
        *len=text->size; 
      };  
      hp.filter_fun=all_ascii_Filter;
    succ|=NewHook(hp,"elf3");
  }
     return succ;
  }
}
bool Elf::attach_function() {
    
    auto _1= InsertElfHook()||__()||elf3();
    return ScenarioHook::attach(processStartAddress,processStopAddress)||_1;
}  

bool isshiftjisX(WORD w){ 
  return   (((BYTE)(w))<=0xfc)&& (((BYTE)(w))>=0x80);
}
void SpecialHookElf2(hook_stack* stack,  HookParam *, uintptr_t *data, uintptr_t *split, size_t *len)
{
  static DWORD lasttext;
  DWORD eax = stack->eax;
  DWORD edx = stack->edx;
    
  *data = *(WORD*)(eax+edx);
  if(isshiftjisX(*data)==false){
    *len=0;
    return;
  }
  *len = 2;
  *split=stack->stack[1];
}
bool Elf2attach_function() {
  //这个有好多乱码
  //[エルフ]あしたの雪之丞 DVD Special Edition
  const uint8_t bytes[] = {
       0x53,
       0x8a,0x1c,0x02,
       0x8b,0x54,0x24,0x08,
       0x03,0xc2
  };
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStopAddress);
  if (!addr)
  return false;
  HookParam hp;
  hp.address=addr+1; 
  hp.text_fun = SpecialHookElf2;
  hp.type=NO_CONTEXT;
  
  return NewHook(hp,"Elf");
}  
bool elf2(){
  //[エルフ]あしたの雪之丞 DVD Special Edition
  //勝　あしたの雪之丞２
  const uint8_t bytes[] = {
    0x66,0x8b,0x8e,XX4,
    0x66,0x8b,0x96,XX4,
    0x66,0x01,0x8e,XX4,
    0x66,0x89,0x96,XX4,
    0x8b,0x06,
    0x6a,0x00,
    0x8b,0xce,
    0xff,0x50,0x08,
    0x84,0xc0
  };
  ULONG addr = MemDbg::findBytes(bytes, sizeof(bytes), processStartAddress, processStopAddress);
  if (!addr)
  return false;
  HookParam hp;
  hp.address=addr+sizeof(bytes);  
  hp.type=NO_CONTEXT|USING_STRING;
  hp.offset=get_reg(regs::ebx);
  
  return NewHook(hp,"Elf");
}
namespace{
  //リフレインブルー【Windows10対応】
  bool _h1(){
    //HAN-18*-4@42E12:AI5WIN.exe
    BYTE sig[]={
      0x33,0xff,
      0x8b,0x06,
      0x8b,0xce,
      0x6a,0x01,
      0x8b,0x40,0x08,
      0xff,0xd0,
      0x0f,0x0b6,0xc0,
      0x8b,0xce,
      0x66,0xc1,0xe0,0x08,
      0x0f,0xb7,0xc0,
      0x89,0x45,0xfc,
      0x8b,0x06,
      0x6a,0x01,
      0x8b,0x40,0x08,
      0xff,0xd0,
      0x0f,0xb6,0xc0,
      0x8b,0xce,
      0x66,0x09,0x45,0xfc,
      0xff,0x75,0xfc,
      0xe8
    };
    ULONG addr = MemDbg::findBytes(sig, sizeof(sig), processStartAddress, processStopAddress);
    if (!addr)return false;
    HookParam hp;
    hp.address=addr+sizeof(sig)-1;  
    hp.type=NO_CONTEXT|USING_CHAR|DATA_INDIRECT|CODEC_ANSI_BE;
    hp.offset=get_reg(regs::ebp);
    hp.index=-4;
    return NewHook(hp,"Elf");
  }
  bool _h2(){
    //HAN4@49570:AI5WIN.exe
    BYTE sig[]={
      0x33,0xc5,
      0x89,0x45,0xfc,
      0x8a,0x81,XX4,

      0x84,0xc0,
      0x75,0x0e,
      0x8b,0x81,XX4,
      0x03,0x81,XX4,
      0xeb,XX,

      0x3c,0x01,
      0x75,0x0e,
      0x8b,0x81,XX4,
      0x03,0x81,XX4,
      0xeb,XX,

      0x3c,0x02,
      0x75,0x0e,
      0x8b,0x81,XX4,
      0x03,0x81,XX4,
      0xeb,XX,
    };
    ULONG addr = MemDbg::findBytes(sig, sizeof(sig), processStartAddress, processStopAddress);
    if (!addr)return false;
    addr=MemDbg::findEnclosingAlignedFunction(addr);
    if (!addr)return false;
    HookParam hp;
    hp.address=addr;  
    hp.type=NO_CONTEXT|USING_CHAR|CODEC_ANSI_BE;
    hp.offset=get_stack(1);
    return NewHook(hp,"Elf");
  }
  bool all(){
    return _h1()|_h2();
  }
}
bool Elf2::attach_function(){
  return elf2()||Elf2attach_function()||all();
}


bool ElfFunClubFinal::attach_function(){
  //mov reg,ds:TextOutA
  bool succ=false;
  for(auto addr: findiatcallormov_all((DWORD)TextOutA,processStartAddress,processStartAddress,processStopAddress,PAGE_EXECUTE,XX)){
    BYTE s[]={XX,0xCC,0xCC,0xCC};
    addr=reverseFindBytes(s,4,addr-0x100,addr);
    if(addr==0)continue;
    HookParam hp;
    hp.address=addr+4;
    hp.type=CODEC_ANSI_BE|USING_CHAR;
    hp.text_fun=[](hook_stack* stack, HookParam *hp, uintptr_t* data, uintptr_t* split, size_t* len){
      *data=(WORD)stack->stack[3];
      *len=2;
      *split=stack->stack[2]>8;
    };
    succ|= NewHook(hp,"ElfFunClubFinal");
  }
  return succ;
  
}