-- ===================================================================
-- MARS-828: Enhanced Archival Strategies Rollback
-- ===================================================================
-- Purpose: Rollback all changes from MARS-828 installation
-- Author: Grzegorz Michalski
-- Date: 2026-01-27

-- Dynamic spool file generation (using SYS_CONTEXT - no DBA privileges required)
-- IMPORTANT: Ensure log/ directory exists before SPOOL (use host mkdir)
host mkdir log 2>nul

var filename VARCHAR2(100)
BEGIN
    :filename := 'log/ROLLBACK_MARS_828_' || SYS_CONTEXT('USERENV', 'CON_NAME') || '_' || TO_CHAR(SYSDATE,'YYYYMMDD_HH24MISS') || '.log';
END;
/
column filename new_value _filename
select :filename filename from dual;
spool &_filename

SET ECHO OFF
SET TIMING ON
SET SERVEROUTPUT ON SIZE UNLIMITED
SET LINESIZE 200
SET PAGESIZE 1000
SET PAUSE OFF

PROMPT
PROMPT ============================================================================
PROMPT MARS-828 Rollback Starting
PROMPT ============================================================================
PROMPT WARNING: This will restore FILE_ARCHIVER to v2.0.0
PROMPT
PROMPT CRITICAL IMPACT:
PROMPT 1. All archival strategies revert to THRESHOLD_BASED
PROMPT 2. ARCHIVAL_STRATEGY and MINIMUM_AGE_MONTHS columns will be dropped
PROMPT 3. Validation trigger will be removed
PROMPT 4. Reconfigure archival thresholds after rollback
PROMPT
PROMPT Timestamp:
SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') AS rollback_start FROM DUAL;
PROMPT ============================================================================

-- Confirm rollback with user
ACCEPT continue CHAR PROMPT 'Type YES to continue with rollback, or Ctrl+C to abort: '
WHENEVER SQLERROR EXIT SQL.SQLCODE
BEGIN
    IF '&continue' IS NULL OR TRIM('&continue') IS NULL OR UPPER(TRIM('&continue')) != 'YES' THEN
        RAISE_APPLICATION_ERROR(-20001, 'Rollback aborted by user');
    END IF;
END;
/
WHENEVER SQLERROR CONTINUE

-- Rollback steps (in reverse order)
PROMPT
PROMPT Step 1/6: Restoring FILE_ARCHIVER Package Specification v2.0.0
PROMPT ===============================================================
@@91_MARS_828_rollback_FILE_ARCHIVER_SPEC.sql

PROMPT
PROMPT Step 2/6: Restoring FILE_ARCHIVER Package Body v2.0.0
PROMPT ======================================================
@@92_MARS_828_rollback_FILE_ARCHIVER_BODY.sql

PROMPT
PROMPT Step 3/6: Dropping validation trigger
PROMPT ======================================
@@93_MARS_828_rollback_trigger.sql

PROMPT
PROMPT Step 4/6: Dropping archival strategy columns
PROMPT =============================================
@@94_MARS_828_rollback_columns.sql

PROMPT
PROMPT Step 5/6: Tracking rollback version
PROMPT ====================================
@@track_package_versions.sql

PROMPT
PROMPT Step 6/6: Verifying tracked packages
PROMPT =====================================
@@verify_packages_version.sql

-- Verify rollback
PROMPT
PROMPT Verification: Package Compilation Status
PROMPT =========================================
SELECT object_name, object_type, status, last_ddl_time
FROM all_objects 
WHERE owner = 'CT_MRDS'
  AND object_name = 'FILE_ARCHIVER' 
  AND object_type IN ('PACKAGE', 'PACKAGE BODY')
ORDER BY object_type;

PROMPT
PROMPT ============================================================================
PROMPT MARS-828 Rollback Completed
PROMPT ============================================================================
PROMPT Completion Time:
SELECT TO_CHAR(SYSDATE, 'YYYY-MM-DD HH24:MI:SS') AS rollback_end FROM DUAL;
PROMPT
PROMPT Rollback Summary:
PROMPT - Package: CT_MRDS.FILE_ARCHIVER
PROMPT - Restored Version: 2.0.0 (THRESHOLD_BASED archival only)
PROMPT - Removed Features: CURRENT_MONTH_ONLY, MINIMUM_AGE_MONTHS, HYBRID strategies
PROMPT
PROMPT Log file: &_filename
PROMPT ============================================================================

spool off

quit;
