#include <switch.h>

#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/iosupport.h>
#include <sys/reent.h>
#include <switch/kernel/ipc.h>

#include "useful.h"

#include "saltysd_core.h"
#include "saltysd_ipc.h"
#include "saltysd_dynamic.h"

#include "lua/lua.h"
#include "lua/lstate.h"

#include "l2c.h"
#include "saltysd_helper.h"
#include "l2c_imports.h"
#include "acmd_imports.h"

u64 ANCHOR_REL;
u64 ANCHOR_ABS;
#define IMPORT(x) (x - ANCHOR_REL + ANCHOR_ABS)

u32 __nx_applet_type = AppletType_None;

static char g_heap[0x8000];

Handle orig_main_thread;
void* orig_ctx;
void* orig_saved_lr;

// app::sv::animcmd::EFFECT_FOLLOW_COLOR(lua_State* a1)
__int64_t (*app_sv_animcmd_EFFECT_FOLLOW_COLOR)(__int64_t);

void __libnx_init(void* ctx, Handle main_thread, void* saved_lr)
{
    extern char* fake_heap_start;
    extern char* fake_heap_end;

    fake_heap_start = &g_heap[0];
    fake_heap_end   = &g_heap[sizeof g_heap];
    
    orig_ctx = ctx;
    orig_main_thread = main_thread;
    orig_saved_lr = saved_lr;
    
    // Call constructors.
    void __libc_init_array(void);
    __libc_init_array();
}

void __attribute__((weak)) NORETURN __libnx_exit(int rc)
{
    // Call destructors.
    void __libc_fini_array(void);
    __libc_fini_array();

    SaltySD_printf("SaltySD Plugin: jumping to %p\n", orig_saved_lr);

    __nx_exit(0, orig_saved_lr);
}

void _ZN3app10sv_animcmd6ATTACKEP9lua_State_replace(__int64_t a1) {
  // Stretched bones fix: Scale down by ModelModule::scale() with lua_State arg of bone?
	
  __int64_t v1; // x19
  uint64_t v2; // x9
  uint64_t i; // x8
  
  // Instantiate our own L2CAgent with the given lua_State
  L2CAgent l2c_agent;
  lib_L2CAgent(&l2c_agent, a1);
  
  // Getting and replacing a value on the stack. Works!
  /*
  L2CValue damage;
  get_lua_stack(&l2c_agent, 4, &damage);
  L2CValue inject_dmg = {.raw_float = ((float)(damage.raw_float) + 10.0), .type = L2C_number};
  lib_L2CAgent_push_lua_stack(&l2c_agent, &inject_dmg);
  lua_replace((lua_State*) l2c_agent.lua_state_agent, 4); 
  */
  
  // Get all necessary hitbox params
  L2CValue bone;
  get_lua_stack(&l2c_agent, 3, &bone);
  L2CValue damage;
  get_lua_stack(&l2c_agent, 4, &damage);
  L2CValue angle;
  get_lua_stack(&l2c_agent, 5, &angle);
  L2CValue kbg;
  get_lua_stack(&l2c_agent, 6, &kbg);
  L2CValue wkb;
  get_lua_stack(&l2c_agent, 7, &wkb);
  L2CValue bkb;
  get_lua_stack(&l2c_agent, 8, &bkb);
  L2CValue size;
  get_lua_stack(&l2c_agent, 9, &size);
  L2CValue x;
  get_lua_stack(&l2c_agent, 10, &x);
  L2CValue y;
  get_lua_stack(&l2c_agent, 11, &y);
  L2CValue z;
  get_lua_stack(&l2c_agent, 12, &z);
  L2CValue x2;
  get_lua_stack(&l2c_agent, 13, &x2);
  L2CValue y2;
  get_lua_stack(&l2c_agent, 14, &y2);
  L2CValue z2;
  get_lua_stack(&l2c_agent, 15, &z2);

  v1 = a1;
  void (*sub_71019420D0)(__int64_t, __int64_t) = (void (*)(__int64_t, __int64_t))(IMPORT(0x71019420D0));
  sub_71019420D0(*(__int64_t *)(*(__int64_t *)(a1 - 8) + 416LL), a1);
  
  // EFFECT_FOLLOW_COLOR(Graphic, Bone, Z, Y, X, ZRot, YRot, XRot, Size, unknown=0x1, Red, Green, Blue)
  float sizeMult = 19.0 / 200.0;
  Hash40 shieldEffectHash = {.hash = 0xAFAE75F05LL};
  
  L2CValue shieldEffect = {.raw = shieldEffectHash.hash, .type = L2C_hash};
  L2CValue xRot = {.raw_float = (float) 0.0, .type = L2C_number};
  L2CValue yRot = {.raw_float = (float) 0.0, .type = L2C_number};
  L2CValue zRot = {.raw_float = (float) 0.0, .type = L2C_number};
  L2CValue unkParam = {.raw = (int) 1, .type = L2C_integer};
  L2CValue unkParam2 = {.raw = (float) 35.0f, .type = L2C_number};
  L2CValue effectSize = {.raw_float = (float) size.raw_float * sizeMult, .type = L2C_number};
  L2CValue red = {.raw_float = (float) 255.0, .type = L2C_number};
  L2CValue green = {.raw_float = (float) 0.0, .type = L2C_number};
  L2CValue blue = {.raw_float = (float) 0.0, .type = L2C_number};
	
  int num_effects;
  if (x2.type != L2C_void && y2.type != L2C_void && z2.type != L2C_void) {
	  num_effects = 4;
  } else {
	x2 = x;
	y2 = y; 
	z2 = z;
	num_effects = 1;
  }
  
  for (int i = 0; i < num_effects; i++) {
	L2CValue currX = {.raw_float = (float) x.raw_float + ((x2.raw_float - x.raw_float) /  3 * i), .type = L2C_number};
	L2CValue currY = {.raw_float = (float) y.raw_float + ((y2.raw_float - y.raw_float) /  3 * i), .type = L2C_number};
	L2CValue currZ = {.raw_float = (float) z.raw_float + ((z2.raw_float - z.raw_float) /  3 * i), .type = L2C_number};
	  
	lib_L2CAgent_clear_lua_stack(&l2c_agent);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &shieldEffect);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &bone);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &currX);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &currY);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &currZ);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &xRot);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &yRot);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &zRot);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &effectSize);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &unkParam);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &red);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &green);
	lib_L2CAgent_push_lua_stack(&l2c_agent, &blue);
	app_sv_animcmd_EFFECT_FOLLOW_COLOR(l2c_agent.lua_state_agent);
  }
  
  // clear_lua_stack section
  v2 = *(__int64_t *)(v1 + 16);
  for ( i = **(__int64_t **)(v1 + 32) + 16LL; v2 < i; v2 = *(__int64_t *)(v1 + 16) )
  {
    *(__int64_t *)(v1 + 16) = v2 + 16;
    *(__int32_t *)(v2 + 8) = 0;
  }
  *(__int64_t *)(v1 + 16) = i;
  
}


int main(int argc, char *argv[])
{
    SaltySD_printf("SaltySD Plugin: alive\n");
	
	// Get anchor for imports
	ANCHOR_REL = 0x7101942070;
	ANCHOR_ABS = SaltySDCore_FindSymbol("_ZN3app10sv_animcmd6ATTACKEP9lua_State");
	
	// Get necessary functions
	app_sv_animcmd_EFFECT_FOLLOW_COLOR = (__int64_t (*)(__int64_t))(IMPORT(0x7101955F10));
    
    char* ver = "Ver. %d.%d.%d";
    u64 dst_3 = SaltySDCore_findCode(ver, strlen(ver));
    if (dst_3) {
        SaltySD_Memcpy(dst_3, "noice v%d%d%d", 13);
    }
	
    // Install animCMD function replacement
	SaltySD_function_replace_sym("_ZN3app10sv_animcmd6ATTACKEP9lua_State", &_ZN3app10sv_animcmd6ATTACKEP9lua_State_replace);
    
    __libnx_exit(0);
}