-- Licensed to the Apache Software Foundation (ASF) under one or more
-- contributor license agreements.  See the NOTICE file distributed with
-- this work for additional information regarding copyright ownership.
-- The ASF licenses this file to You under the Apache License, Version 2.0
-- (the "License"); you may not use this file except in compliance with
-- the License.  You may obtain a copy of the License at
--
--     http://www.apache.org/licenses/LICENSE-2.0
--
-- Unless required by applicable law or agreed to in writing, software
-- distributed under the License is distributed on an "AS IS" BASIS,
-- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-- See the License for the specific language governing permissions and
-- limitations under the License.

DECLARE
    v_index_exists number:=0;
    v_count number:=0;

BEGIN
    execute IMMEDIATE 'ALTER TABLE x_rms_resource_mapping DISABLE CONSTRAINT x_rms_res_map_FK_hl_res_id';
    execute IMMEDIATE 'ALTER TABLE x_rms_resource_mapping DISABLE CONSTRAINT x_rms_res_map_FK_ll_res_id';
    execute IMMEDIATE 'truncate table x_rms_mapping_provider';
    execute IMMEDIATE 'truncate table x_rms_resource_mapping';
    execute IMMEDIATE 'truncate table x_rms_notification';
    execute IMMEDIATE 'truncate table x_rms_service_resource';
    execute IMMEDIATE 'ALTER TABLE x_rms_resource_mapping ENABLE CONSTRAINT x_rms_res_map_FK_hl_res_id';
    execute IMMEDIATE 'ALTER TABLE x_rms_resource_mapping ENABLE CONSTRAINT x_rms_res_map_FK_ll_res_id';
    commit;
    SELECT COUNT(*) INTO v_index_exists FROM USER_INDEXES WHERE INDEX_NAME = upper('x_rms_svc_res_IDX_res_sgn') AND TABLE_NAME= upper('x_rms_service_resource');
    IF (v_index_exists > 0) THEN
        EXECUTE IMMEDIATE 'DROP INDEX x_rms_svc_res_IDX_res_sgn';
        commit;
    END IF;

    select count(*) into v_count from user_tab_cols where table_name=upper('x_rms_service_resource') and column_name IN('RESOURCE_SIGNATURE');
    if (v_count = 1) then
        v_count:=0;
        select count(*) into v_count from user_constraints where table_name=upper('x_rms_service_resource') and constraint_name=upper('x_rms_svc_res_UK_res_sgn') and constraint_type='U';
        if (v_count = 0) then
            v_count:=0;
            select count(*) into v_count from user_ind_columns WHERE table_name=upper('x_rms_service_resource') and column_name IN('RESOURCE_SIGNATURE') and index_name=upper('x_rms_svc_res_UK_res_sgn');
            if (v_count = 0) THEN
                EXECUTE IMMEDIATE 'ALTER TABLE x_rms_service_resource ADD CONSTRAINT x_rms_svc_res_UK_res_sgn UNIQUE (RESOURCE_SIGNATURE)';
                commit;
            end if;
        end if;
    end if;
END;/