#include "mem.h"

#include <uv.h>

#if !defined(_WIN32)
#include <openssl/crypto.h>
#endif

#include <string.h>

static int64_t s_tf_malloc_size;
static int64_t s_uv_malloc_size;
static int64_t s_tls_malloc_size;

static void* _tf_alloc(int64_t* total, size_t size)
{
	void* ptr = malloc(size + sizeof(size_t));
	if (ptr)
	{
		__atomic_add_fetch(total, size, __ATOMIC_RELAXED);
		memcpy(ptr, &size, sizeof(size_t));
		return (void*)((intptr_t)ptr + sizeof(size_t));
	}
	else
	{
		return NULL;
	}
}

static void* _tf_realloc(int64_t* total, void* ptr, size_t size)
{
	void* old_ptr = ptr ? (void*)((intptr_t)ptr - sizeof(size_t)) : NULL;
	size_t old_size = 0;
	if (old_ptr)
	{
		memcpy(&old_size, old_ptr, sizeof(size_t));
	}
	void* new_ptr = realloc(old_ptr, size + sizeof(size_t));
	if (new_ptr)
	{
		__atomic_add_fetch(total, (int64_t)size - (int64_t)old_size, __ATOMIC_RELAXED);
		memcpy(new_ptr, &size, sizeof(size_t));
		return (void*)((intptr_t)new_ptr + sizeof(size_t));
	}
	else
	{
		__atomic_sub_fetch(total, old_size, __ATOMIC_RELAXED);
		return NULL;
	}
}

static void _tf_free(int64_t* total, void* ptr)
{
	if (ptr)
	{
		void* old_ptr = (void*)((intptr_t)ptr - sizeof(size_t));
		size_t size = 0;
		memcpy(&size, old_ptr, sizeof(size_t));
		__atomic_sub_fetch(total, size, __ATOMIC_RELAXED);
		free(old_ptr);
	}
}

static void* _tf_uv_alloc(size_t size)
{
	return _tf_alloc(&s_uv_malloc_size, size);
}

static void* _tf_uv_realloc(void* ptr, size_t size)
{
	return _tf_realloc(&s_uv_malloc_size, ptr, size);
}

static void* _tf_uv_calloc(size_t nmemb, size_t size)
{
	void* ptr = calloc(1, nmemb * size + sizeof(size_t));
	if (ptr)
	{
		size_t total_size = nmemb * size;
		__atomic_add_fetch(&s_uv_malloc_size, total_size, __ATOMIC_RELAXED);
		memcpy(ptr, &total_size, sizeof(size_t));
		return (void*)((intptr_t)ptr + sizeof(size_t));
	}
	else
	{
		return NULL;
	}
}

static void _tf_uv_free(void* ptr)
{
	_tf_free(&s_uv_malloc_size, ptr);
}

void tf_mem_replace_uv_allocator()
{
	uv_replace_allocator(_tf_uv_alloc, _tf_uv_realloc, _tf_uv_calloc, _tf_uv_free);
}

size_t tf_mem_get_uv_malloc_size()
{
	return s_uv_malloc_size;
}

#if !defined(_WIN32)
void* _tf_tls_alloc(size_t size, const char* file, int line)
{
	return _tf_alloc(&s_tls_malloc_size, size);
}

void* _tf_tls_realloc(void* ptr, size_t size, const char* file, int line)
{
	return _tf_realloc(&s_tls_malloc_size, ptr, size);
}

void _tf_tls_free(void* ptr, const char* file, int line)
{
	_tf_free(&s_tls_malloc_size, ptr);
}
#endif

void tf_mem_replace_tls_allocator()
{
#if !defined(_WIN32)
	CRYPTO_set_mem_functions(_tf_tls_alloc, _tf_tls_realloc, _tf_tls_free);
#endif
}

size_t tf_mem_get_tls_malloc_size()
{
	return s_tls_malloc_size;
}

void* tf_malloc(size_t size)
{
	return _tf_alloc(&s_tf_malloc_size, size);
}

void* tf_realloc(void* ptr, size_t size)
{
	return _tf_realloc(&s_tf_malloc_size, ptr, size);
}

void tf_free(void* ptr)
{
	_tf_free(&s_tf_malloc_size, ptr);
}

char* tf_strdup(const char* string)
{
	size_t len = strlen(string);
	char* buffer = tf_malloc(len + 1);
	memcpy(buffer, string, len + 1);
	return buffer;
}

size_t tf_mem_get_tf_malloc_size()
{
	return s_tf_malloc_size;
}