//
 // mysqlpl_fwd.cpp
 //
 // Copyright (c) 2007 Martin Fuchs <martin-fuchs@gmx.net>
 //

 /// \file mysqlpl_fwd.cpp
 /// MySQLPL/D interface to the MySQL C API implemented in C++


/*

  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  * Redistributions of source code must retain the above copyright
	notice, this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright
	notice, this list of conditions and the following disclaimer in
	the documentation and/or other materials provided with the
	distribution.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  POSSIBILITY OF SUCH DAMAGE.

*/

#include <windows.h>
#include <assert.h>

#include <mysql.h>


#ifndef MYSQLPL_PREP_STMT
#if MYSQL_VERSION_ID>=41000
#define MYSQLPL_PREP_STMT	1
#else
#define MYSQLPL_PREP_STMT	0
#endif
#endif


#define MYSQL void
#define MYSQL_STMT void


static HMODULE s_hmysql = LoadLibrary("libmysql.dll");


extern "C" {


#define DECLARE_MYSQL_EXTERN(rt, n, ...) \
typedef rt (__stdcall* Tmysql_##n) __VA_ARGS__; \
extern Tmysql_##n mysqlpl_##n;

#define INIT_MYSQL_EXTERN(rt, n, ...) \
mysqlpl_##n = (Tmysql_##n) GetProcAddress(s_hmysql, "mysql_" #n);


DECLARE_MYSQL_EXTERN(MYSQL*, real_connect, (MYSQL*, char*, char*, char*, char*, unsigned, char*, unsigned))
DECLARE_MYSQL_EXTERN(void, close, (MYSQL*))
DECLARE_MYSQL_EXTERN(MYSQL_RES*, store_result, (MYSQL*))
DECLARE_MYSQL_EXTERN(void, free_result, (MYSQL_RES*))
DECLARE_MYSQL_EXTERN(char*, info, (MYSQL*))
DECLARE_MYSQL_EXTERN(unsigned, errno, (MYSQL*))
DECLARE_MYSQL_EXTERN(char*, error, (MYSQL*))
DECLARE_MYSQL_EXTERN(unsigned, warning_count, (MYSQL*))
DECLARE_MYSQL_EXTERN(my_ulonglong, affected_rows, (MYSQL*))
DECLARE_MYSQL_EXTERN(unsigned, num_fields, (MYSQL_RES*))
DECLARE_MYSQL_EXTERN(MYSQL_FIELD*, fetch_fields, (MYSQL_RES*))
DECLARE_MYSQL_EXTERN(MYSQL_FIELD*, fetch_field_direct, (MYSQL_RES*, int))

DECLARE_MYSQL_EXTERN(my_bool, commit, (MYSQL*))
DECLARE_MYSQL_EXTERN(my_bool, rollback, (MYSQL*))
DECLARE_MYSQL_EXTERN(my_ulonglong, insert_id, (MYSQL*))
DECLARE_MYSQL_EXTERN(my_bool, query, (MYSQL*, char*))
DECLARE_MYSQL_EXTERN(MYSQL_ROW, fetch_row, (MYSQL_RES*))

#if MYSQLPL_PREP_STMT
DECLARE_MYSQL_EXTERN(unsigned, stmt_errno, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(char*, sqlstate, (MYSQL*))
DECLARE_MYSQL_EXTERN(char*, stmt_error, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(char*, stmt_sqlstate, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(my_bool, autocommit, (MYSQL*, unsigned))
DECLARE_MYSQL_EXTERN(MYSQL_STMT*, stmt_init, (MYSQL*))
DECLARE_MYSQL_EXTERN(int, stmt_prepare, (MYSQL_STMT*, char* sql, int length))
DECLARE_MYSQL_EXTERN(void, stmt_close, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(int, stmt_execute, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(int, stmt_fetch, (MYSQL_STMT*))
DECLARE_MYSQL_EXTERN(MYSQL_RES*, stmt_store_result, (MYSQL_STMT* s))
DECLARE_MYSQL_EXTERN(my_bool, stmt_bind_param, (MYSQL_STMT*, MYSQL_BIND*))
DECLARE_MYSQL_EXTERN(my_bool, stmt_bind_result, (MYSQL_STMT* s, MYSQL_BIND*))
DECLARE_MYSQL_EXTERN(int, stmt_affected_rows, (MYSQL_STMT* s))
DECLARE_MYSQL_EXTERN(my_bool, stmt_result_metadata, (MYSQL*))
#endif


typedef MYSQL* (__stdcall* Tmysql_init)(MYSQL*);
static Tmysql_init s_mysql_init;

void init_mysql_functions()
{
	s_mysql_init = (Tmysql_init) GetProcAddress(s_hmysql, "mysql_init");

	INIT_MYSQL_EXTERN(MYSQL*, real_connect, (MYSQL*, char*, char*, char*, char*, unsigned, char*, unsigned))
	INIT_MYSQL_EXTERN(void, close, (MYSQL*))
	INIT_MYSQL_EXTERN(MYSQL_RES*, store_result, (MYSQL*))
	INIT_MYSQL_EXTERN(void, free_result, (MYSQL_RES*))
	INIT_MYSQL_EXTERN(char*, info, (MYSQL*))
	INIT_MYSQL_EXTERN(unsigned, errno, (MYSQL*))
	INIT_MYSQL_EXTERN(char*, error, (MYSQL*))
	INIT_MYSQL_EXTERN(unsigned, warning_count, (MYSQL*))
	INIT_MYSQL_EXTERN(my_ulonglong, affected_rows, (MYSQL*))
	INIT_MYSQL_EXTERN(unsigned, num_fields, (MYSQL_RES*))
	INIT_MYSQL_EXTERN(MYSQL_FIELD*, fetch_fields, (MYSQL_RES*))
	INIT_MYSQL_EXTERN(MYSQL_FIELD*, fetch_field_direct, (MYSQL_RES*, int))

	INIT_MYSQL_EXTERN(my_bool, commit, (MYSQL*))
	INIT_MYSQL_EXTERN(my_bool, rollback, (MYSQL*))
	INIT_MYSQL_EXTERN(my_ulonglong, insert_id, (MYSQL*))
	INIT_MYSQL_EXTERN(my_bool, query, (MYSQL*, char*))
	INIT_MYSQL_EXTERN(MYSQL_ROW, fetch_row, (MYSQL_RES*))

#if MYSQLPL_PREP_STMT
	INIT_MYSQL_EXTERN(unsigned, stmt_errno, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(char*, sqlstate, (MYSQL*))
	INIT_MYSQL_EXTERN(char*, stmt_error, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(char*, stmt_sqlstate, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(my_bool, autocommit, (MYSQL*, unsigned))
	INIT_MYSQL_EXTERN(MYSQL_STMT*, stmt_init, (MYSQL*))
	INIT_MYSQL_EXTERN(int, stmt_prepare, (MYSQL_STMT*, char* sql, int length))
	INIT_MYSQL_EXTERN(void, stmt_close, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(int, stmt_execute, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(int, stmt_fetch, (MYSQL_STMT*))
	INIT_MYSQL_EXTERN(MYSQL_RES*, stmt_store_result, (MYSQL_STMT* s))
	INIT_MYSQL_EXTERN(my_bool, stmt_bind_param, (MYSQL_STMT*, MYSQL_BIND*))
	INIT_MYSQL_EXTERN(my_bool, stmt_bind_result, (MYSQL_STMT* s, MYSQL_BIND*))
	INIT_MYSQL_EXTERN(int, stmt_affected_rows, (MYSQL_STMT* s))
	INIT_MYSQL_EXTERN(my_bool, stmt_result_metadata, (MYSQL*))
#endif
}


MYSQL* mysqlpl_init(MYSQL* db)
{
	if (!s_mysql_init) {
		init_mysql_functions();

		assert(s_mysql_init);
	}

	return s_mysql_init(db);
}


const char* mysqlpl_field_get_table(const MYSQL_FIELD* field)
{
	return field->table;
}

const char* mysqlpl_field_get_name(const MYSQL_FIELD* field)
{
	return field->name;
}

enum_field_types mysqlpl_field_get_type(const MYSQL_FIELD* field)
{
	return field->type;
}

int mysqlpl_field_get_length(const MYSQL_FIELD* field)
{
	return field->length;
}

int mysqlpl_field_get_decimals(const MYSQL_FIELD* field)
{
	return field->decimals;
}

int mysqlpl_field_get_flags(const MYSQL_FIELD* field)
{
	return field->flags;
}


 // increment MYSQL_FIELD pointer using the correct structure size
MYSQL_FIELD* mysqlpl_next_field(MYSQL_FIELD* field)
{
	return field + 1;
}


void bindvector_free(MYSQL_BIND* p)
{
	free(p);
}

MYSQL_BIND* bindvector_resize(MYSQL_BIND* p, int length)
{
	return (MYSQL_BIND*) realloc(p, length*sizeof(MYSQL_BIND));
}

 // increment MYSQL_BIND pointer using the correct structure size
MYSQL_BIND* bindvector_next(MYSQL_BIND* p)
{
	return p + 1;
}

void bindvector_bind(MYSQL_BIND* bind, void* ptr, enum_field_types type, int len, my_bool* pind, unsigned long* plen)
{
	memset(bind, 0, sizeof(MYSQL_BIND));

	bind->buffer = ptr;
	bind->buffer_type = type;
	bind->buffer_length = len;
	bind->is_null = pind;
	bind->length = plen;
}


} // extern "C"