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#include "dbd_oracle.h"

/*
 * Converts SQLite types to Lua types
 */
static lua_push_type_t oracle_to_lua_push(unsigned int oracle_type, int null) {
    lua_push_type_t lua_type;

    if (null)
	return LUA_PUSH_NIL;

    switch(oracle_type) {
    case SQLT_NUM:
    case SQLT_FLT:
	lua_type = LUA_PUSH_NUMBER;
	break;
    case SQLT_INT:
	lua_type = LUA_PUSH_INTEGER;
	break;
    default:
        lua_type = LUA_PUSH_STRING;
    }

    return lua_type;
}

/*
 * Fetch metadata from the database
 */

static void statement_fetch_metadata(lua_State *L, statement_t *statement) {
    bindparams_t *bind;
    int i;

    char errbuf[100];
    int errcode;
    int rc;

    if (statement->metadata)
	return;

    statement->bind = (bindparams_t *)malloc(sizeof(bindparams_t) * statement->num_columns);
    memset(statement->bind, 0, sizeof(bindparams_t) * statement->num_columns);
    bind = statement->bind;

    for (i = 0; i < statement->num_columns; i++) {
	rc = OCIParamGet(statement->stmt, OCI_HTYPE_STMT, statement->conn->err, (dvoid **)&bind[i].param, i+1);
	if (rc) {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
	    luaL_error(L, "param get %s", errbuf);
	}

	rc = OCIAttrGet(bind[i].param, OCI_DTYPE_PARAM, (dvoid *)&(bind[i].name), (ub4 *)&(bind[i].name_len), OCI_ATTR_NAME, statement->conn->err);
	if (rc) {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
	    luaL_error(L, "name get %s", errbuf);
	}

	rc = OCIAttrGet(bind[i].param, OCI_DTYPE_PARAM, (dvoid *)&(bind[i].data_type), (ub4 *)0, OCI_ATTR_DATA_TYPE, statement->conn->err);
	if (rc) {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
	    luaL_error(L, "datatype get %s", errbuf);
	}

	rc = OCIAttrGet(bind[i].param, OCI_DTYPE_PARAM, (dvoid *)&(bind[i].max_len), 0, OCI_ATTR_DATA_SIZE, statement->conn->err);
	if (rc) {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);
	    luaL_error(L, "datasize get %s", errbuf);
	}

	bind[i].data = calloc(bind[i].max_len+1, sizeof(char));
	rc = OCIDefineByPos(statement->stmt, &bind[i].define, statement->conn->err, (ub4)i+1, bind[i].data, bind[i].max_len, SQLT_STR, (dvoid *)&(bind[i].null), (ub2 *)0, (ub2 *)0, (ub4)OCI_DEFAULT);
	if (rc) {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4)sizeof(errbuf), OCI_HTYPE_ERROR);
	    luaL_error(L, "define by pos %s", errbuf);
	}
    }

    statement->metadata = 1;
}


/*
 * num_affected_rows = statement:affected()
 */
static int statement_affected(lua_State *L) {
    statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_ORACLE_STATEMENT);
    int affected;
    int rc; 

    if (!statement->stmt) {
        luaL_error(L, DBI_ERR_INVALID_STATEMENT);
    }

    /* 
     * get number of affected rows 
     */
    rc = OCIAttrGet(
	(dvoid *)statement->stmt, 
	(ub4)OCI_HTYPE_STMT,
        (dvoid *)&affected, 
	(ub4 *)0, 
	(ub4)OCI_ATTR_ROW_COUNT,
        statement->conn->err
    );

    lua_pushinteger(L, affected);

    return 1;
}

/*
 * success = statement:close()
 */
int statement_close(lua_State *L) {
    statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_ORACLE_STATEMENT);
    int ok = 0;

    if (statement->stmt) {
	int rc;

	rc = OCIHandleFree((dvoid *)statement->stmt, OCI_HTYPE_STMT);    /* Free handles */	

	statement->stmt = NULL;
    }

    if (statement->bind) {
	free(statement->bind);
	statement->bind = NULL;
    }

    lua_pushboolean(L, ok);
    return 1;
}

/*
 *  column_names = statement:columns()
 */
static int statement_columns(lua_State *L) {
    statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_ORACLE_STATEMENT);
    int rc;

    bindparams_t *bind;

    char errbuf[100];
    int errcode;

    int i;
    int d = 1;

    if (!statement->stmt) {
        luaL_error(L, DBI_ERR_INVALID_STATEMENT);
        return 0;
    }

    statement_fetch_metadata(L, statement);    

    lua_newtable(L);
    for (i = 0; i < statement->num_columns; i++) {
	const char *name = strlower(statement->bind[i].name);

	LUA_PUSH_ARRAY_STRING(d, name);
    }

    return 1;
}


/*
 * success,err = statement:execute(...)
 */
int statement_execute(lua_State *L) {
    int n = lua_gettop(L);
    statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_ORACLE_STATEMENT);
    int p;
    int errflag = 0;
    const char *errstr = NULL;
    int num_columns;
    int rc;

    char errbuf[100];
    int errcode;

    ub2 type;

    if (!statement->stmt) {
	lua_pushboolean(L, 0);
	lua_pushstring(L, DBI_ERR_EXECUTE_INVALID);
	return 2;
    }

    for (p = 2; p <= n; p++) {
	int i = p - 1;
	int type = lua_type(L, p);
	char err[64];
	const char *value;

	OCIBind *bnd = (OCIBind *)0;

	switch(type) {
	case LUA_TNIL:
	    errflag = OCIBindByPos(
		statement->stmt, 
		&bnd, 
		statement->conn->err, 
		i, 
		NULL, 
		0, 
		SQLT_CHR, 
		(dvoid *)0, 
		(ub2 *)0, 
		(ub2 *)0, 
		(ub4)0, 
		(ub4 *)0,
		OCI_DEFAULT);
	    break;
	case LUA_TNUMBER:
	case LUA_TSTRING:
	case LUA_TBOOLEAN:
	    value = lua_tostring(L, p);

	    errflag = OCIBindByPos(
		statement->stmt, 
		&bnd, 
		statement->conn->err, 
		i, 
		value, 
		strlen(value), 
		SQLT_CHR, 
		(dvoid *)0, 
		(ub2 *)0, 
		(ub2 *)0, 
		(ub4)0, 
		(ub4 *)0,
		(ub4)OCI_DEFAULT);
	    break;
	default:
	    /*
	     * Unknown/unsupported value type
	     */
	    errflag = 1;
            snprintf(err, sizeof(err)-1, DBI_ERR_BINDING_TYPE_ERR, lua_typename(L, type));
            errstr = err;
	}

	if (errflag)
	    break;
    }   

    if (errflag) {
	lua_pushboolean(L, 0);
	if (errstr)
	    lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errstr);
	else {
	    OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);

	    lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errbuf);
	}
    
	return 2;
    }

    /* 
     * statement type 
     */
    rc = OCIAttrGet(
	(dvoid *)statement->stmt, 
	(ub4)OCI_HTYPE_STMT, 
	(dvoid *)&type, 
	(ub4 *)0, 
	(ub4)OCI_ATTR_STMT_TYPE, 
	statement->conn->err
    );

    if (rc) {
	OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);

	lua_pushboolean(L, 0);
	lua_pushfstring(L, "Error getting type: %s", errbuf);

	return 2;
    }

    /*
     * execute statement
     */
    rc = OCIStmtExecute(
	statement->conn->svc, 
	statement->stmt, 
	statement->conn->err, 
	type == OCI_STMT_SELECT ? 0 : 1, 
	(ub4)0, 
	(CONST OCISnapshot *)NULL, 
	(OCISnapshot *)NULL, 
	statement->conn->autocommit ? OCI_COMMIT_ON_SUCCESS : OCI_DEFAULT
    );

    if (rc) {
	OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);

	lua_pushboolean(L, 0);
	lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errbuf);

	return 2;
    }

    /* 
     * get number of columns 
     */
    rc = OCIAttrGet(
	(dvoid *)statement->stmt, 
	(ub4)OCI_HTYPE_STMT,
        (dvoid *)&num_columns, 
	(ub4 *)0, 
	(ub4)OCI_ATTR_PARAM_COUNT,
        statement->conn->err
    );

    if (rc) {
	OCIErrorGet((dvoid *)statement->conn->err, (ub4) 1, (text *) NULL, &errcode, errbuf, (ub4) sizeof(errbuf), OCI_HTYPE_ERROR);

	lua_pushboolean(L, 0);
	lua_pushfstring(L, DBI_ERR_BINDING_PARAMS, errbuf);

	return 2;
    }

    statement->num_columns = num_columns;

    lua_pushboolean(L, 1);
    return 1;
}

/*
 * must be called after an execute
 */
static int statement_fetch_impl(lua_State *L, statement_t *statement, int named_columns) {
    int rc;
    sword status;
    int i;
    bindparams_t *bind;

    char errbuf[100];
    int errcode;

    if (!statement->stmt) {
	luaL_error(L, DBI_ERR_FETCH_INVALID);
	return 0;
    }

    statement_fetch_metadata(L, statement);    
    bind = statement->bind;

    status = OCIStmtFetch(statement->stmt, statement->conn->err, 1, OCI_FETCH_NEXT, OCI_DEFAULT);

    if (status == OCI_NO_DATA) {
	/* No more rows */
        lua_pushnil(L);
        return 1;
    } else if (status != OCI_SUCCESS) {
	OCIErrorGet((dvoid *)statement->conn->err, (ub4)1, (text *)NULL, &errcode, errbuf, (ub4)sizeof(errbuf), OCI_HTYPE_ERROR);
	luaL_error(L, DBI_ERR_FETCH_FAILED, errbuf);
    }

    if (statement->num_columns) {
	int i;
	int d = 1;

	lua_newtable(L);

	for (i = 0; i < statement->num_columns; i++) {
	    lua_push_type_t lua_push = oracle_to_lua_push(bind[i].data_type, bind[i].null);
	    const char *name = strlower(bind[i].name);
	    const char *data = bind[i].data;

	    if (lua_push == LUA_PUSH_NIL) {
                if (named_columns) {
                    LUA_PUSH_ATTRIB_NIL(name);
                } else {
                    LUA_PUSH_ARRAY_NIL(d);
                }
            } else if (lua_push == LUA_PUSH_INTEGER) {
		int val = atoi(data);

                if (named_columns) {
                    LUA_PUSH_ATTRIB_INT(name, val);
                } else {
                    LUA_PUSH_ARRAY_INT(d, val);
                }
            } else if (lua_push == LUA_PUSH_NUMBER) {
		double val = strtod(data, NULL);

                if (named_columns) {
                    LUA_PUSH_ATTRIB_FLOAT(name, val);
                } else {
                    LUA_PUSH_ARRAY_FLOAT(d, val);
                }
            } else if (lua_push == LUA_PUSH_STRING) {
                if (named_columns) {
                    LUA_PUSH_ATTRIB_STRING(name, data);
                } else {
                    LUA_PUSH_ARRAY_STRING(d, data);
                }
            } else if (lua_push == LUA_PUSH_BOOLEAN) {
		int val = atoi(data);

                if (named_columns) {
                    LUA_PUSH_ATTRIB_BOOL(name, val);
                } else {
                    LUA_PUSH_ARRAY_BOOL(d, val);
                }
            } else {
                luaL_error(L, DBI_ERR_UNKNOWN_PUSH);
            }
	}
    } else {
	/* 
         * no columns returned by statement?
         */ 
	lua_pushnil(L);
    }

    return 1;    
}

static int next_iterator(lua_State *L) {
    statement_t *statement = (statement_t *)luaL_checkudata(L, lua_upvalueindex(1), DBD_ORACLE_STATEMENT);
    int named_columns = lua_toboolean(L, lua_upvalueindex(2));

    return statement_fetch_impl(L, statement, named_columns);
}

/*
 * table = statement:fetch(named_indexes)
 */
static int statement_fetch(lua_State *L) {
    statement_t *statement = (statement_t *)luaL_checkudata(L, 1, DBD_ORACLE_STATEMENT);
    int named_columns = lua_toboolean(L, 2);

    return statement_fetch_impl(L, statement, named_columns);
}

/*
 * num_rows = statement:rowcount()
 */
static int statement_rowcount(lua_State *L) {
    luaL_error(L, DBI_ERR_NOT_IMPLEMENTED, DBD_ORACLE_STATEMENT, "rowcount");

    return 0;
}

/*
 * iterfunc = statement:rows(named_indexes)
 */
static int statement_rows(lua_State *L) {
    if (lua_gettop(L) == 1) {
        lua_pushvalue(L, 1);
        lua_pushboolean(L, 0);
    } else {
        lua_pushvalue(L, 1);
        lua_pushboolean(L, lua_toboolean(L, 2));
    }

    lua_pushcclosure(L, next_iterator, 2);
    return 1;
}

/*
 * __gc
 */
static int statement_gc(lua_State *L) {
    /* always free the handle */
    statement_close(L);

    return 0;
}

int dbd_oracle_statement_create(lua_State *L, connection_t *conn, const char *sql_query) { 
    int rc;
    statement_t *statement = NULL;
    OCIStmt *stmt;
    char *new_sql;

    /*
     * convert SQL string into a Oracle API compatible SQL statement
     */
    new_sql = replace_placeholders(L, ':', sql_query);

    rc = OCIHandleAlloc((dvoid *)conn->oracle, (dvoid **)&stmt, OCI_HTYPE_STMT, 0, (dvoid **)0);
    rc = OCIStmtPrepare(stmt, conn->err, new_sql, strlen(new_sql), (ub4)OCI_NTV_SYNTAX, (ub4)OCI_DEFAULT);

    free(new_sql);

    statement = (statement_t *)lua_newuserdata(L, sizeof(statement_t));
    statement->conn = conn;
    statement->stmt = stmt;
    statement->num_columns = 0;
    statement->bind = NULL;
    statement->metadata = 0;

    luaL_getmetatable(L, DBD_ORACLE_STATEMENT);
    lua_setmetatable(L, -2);

    return 1;
} 

int dbd_oracle_statement(lua_State *L) {
    static const luaL_Reg statement_methods[] = {
	{"affected", statement_affected},
	{"close", statement_close},
	{"columns", statement_columns},
	{"execute", statement_execute},
	{"fetch", statement_fetch},
	{"rowcount", statement_rowcount},
	{"rows", statement_rows},
	{NULL, NULL}
    };

    static const luaL_Reg statement_class_methods[] = {
	{NULL, NULL}
    };

    luaL_newmetatable(L, DBD_ORACLE_STATEMENT);
    luaL_register(L, 0, statement_methods);
    lua_pushvalue(L,-1);
    lua_setfield(L, -2, "__index");

    lua_pushcfunction(L, statement_gc);
    lua_setfield(L, -2, "__gc");

    luaL_register(L, DBD_ORACLE_STATEMENT, statement_class_methods);

    return 1;    
}