-- ============================================================================
-- PHASE 6: DROP JSONB COLUMNS
-- ============================================================================
-- 
-- ⚠️⚠️⚠️ DANGER: THIS MIGRATION IS IRREVERSIBLE ⚠️⚠️⚠️
-- 
-- This migration drops all JSONB columns from production tables.
-- Once executed, there is NO WAY to recover the JSONB data without a backup.
-- 
-- DO NOT RUN until:
-- 1. All application code has been thoroughly tested
-- 2. All queries are verified to use relational tables
-- 3. No JSONB-related errors in production logs for 2+ weeks
-- 4. Database backup has been created
-- 5. Rollback plan is prepared
-- 6. Change has been approved by technical leadership
-- 
-- ============================================================================

BEGIN;

-- Log this critical operation
DO $$
BEGIN
  RAISE NOTICE 'Starting Phase 6: Dropping JSONB columns';
  RAISE NOTICE 'This operation is IRREVERSIBLE';
  RAISE NOTICE 'Timestamp: %', NOW();
END $$;

-- ============================================================================
-- STEP 1: Drop JSONB columns from audit tables
-- ============================================================================

-- admin_audit_log.details → admin_audit_details table
ALTER TABLE admin_audit_log 
  DROP COLUMN IF EXISTS details;

COMMENT ON TABLE admin_audit_log IS 'Admin audit log (details migrated to admin_audit_details table)';

-- moderation_audit_log.metadata → moderation_audit_metadata table
ALTER TABLE moderation_audit_log 
  DROP COLUMN IF EXISTS metadata;

COMMENT ON TABLE moderation_audit_log IS 'Moderation audit log (metadata migrated to moderation_audit_metadata table)';

-- profile_audit_log.changes → profile_change_fields table
ALTER TABLE profile_audit_log 
  DROP COLUMN IF EXISTS changes;

COMMENT ON TABLE profile_audit_log IS 'Profile audit log (changes migrated to profile_change_fields table)';

-- item_edit_history.changes → item_change_fields table
ALTER TABLE item_edit_history 
  DROP COLUMN IF EXISTS changes;

COMMENT ON TABLE item_edit_history IS 'Item edit history (changes migrated to item_change_fields table)';

-- ============================================================================
-- STEP 2: Drop JSONB columns from request tracking
-- ============================================================================

-- request_metadata.breadcrumbs → request_breadcrumbs table
ALTER TABLE request_metadata 
  DROP COLUMN IF EXISTS breadcrumbs;

-- request_metadata.environment_context (kept minimal for now, but can be dropped if not needed)
ALTER TABLE request_metadata 
  DROP COLUMN IF EXISTS environment_context;

COMMENT ON TABLE request_metadata IS 'Request metadata (breadcrumbs migrated to request_breadcrumbs table)';

-- ============================================================================
-- STEP 3: Drop JSONB columns from notification system
-- ============================================================================

-- notification_logs.payload → notification_event_data table
-- NOTE: Verify edge functions don't use this before dropping
ALTER TABLE notification_logs 
  DROP COLUMN IF EXISTS payload;

COMMENT ON TABLE notification_logs IS 'Notification logs (payload migrated to notification_event_data table)';

-- ============================================================================
-- STEP 4: Drop JSONB columns from moderation system
-- ============================================================================

-- conflict_resolutions.conflict_details → conflict_detail_fields table
ALTER TABLE conflict_resolutions 
  DROP COLUMN IF EXISTS conflict_details;

COMMENT ON TABLE conflict_resolutions IS 'Conflict resolutions (details migrated to conflict_detail_fields table)';

-- ============================================================================
-- STEP 5: Drop JSONB columns from contact system
-- ============================================================================

-- contact_email_threads.metadata (minimal usage, safe to drop)
ALTER TABLE contact_email_threads 
  DROP COLUMN IF EXISTS metadata;

-- contact_submissions.submitter_profile_data → FK to profiles table
ALTER TABLE contact_submissions 
  DROP COLUMN IF EXISTS submitter_profile_data;

COMMENT ON TABLE contact_submissions IS 'Contact submissions (profile data accessed via FK to profiles table)';

-- ============================================================================
-- STEP 6: Drop JSONB columns from content system
-- ============================================================================

-- content_submissions.content → submission_metadata table
-- ⚠️ CRITICAL: This is the most important change - verify thoroughly
ALTER TABLE content_submissions 
  DROP COLUMN IF EXISTS content;

COMMENT ON TABLE content_submissions IS 'Content submissions (metadata migrated to submission_metadata table)';

-- ============================================================================
-- STEP 7: Drop JSONB columns from review system
-- ============================================================================

-- reviews.photos → review_photos table
ALTER TABLE reviews 
  DROP COLUMN IF EXISTS photos;

COMMENT ON TABLE reviews IS 'Reviews (photos migrated to review_photos table)';

-- ============================================================================
-- STEP 8: Historical data tables (OPTIONAL - keep for now)
-- ============================================================================

-- Historical tables use JSONB for archive purposes - this is acceptable
-- We can keep these columns or drop them based on data retention policy

-- OPTION 1: Keep for historical reference (RECOMMENDED)
-- No action needed - historical data can use JSONB

-- OPTION 2: Drop if historical snapshots are not needed
/*
ALTER TABLE historical_parks 
  DROP COLUMN IF EXISTS final_state_data;

ALTER TABLE historical_rides 
  DROP COLUMN IF EXISTS final_state_data;
*/

-- ============================================================================
-- STEP 9: Verify no JSONB columns remain (except approved)
-- ============================================================================

DO $$
DECLARE
  jsonb_count INTEGER;
BEGIN
  SELECT COUNT(*) INTO jsonb_count
  FROM information_schema.columns
  WHERE table_schema = 'public'
    AND data_type = 'jsonb'
    AND table_name NOT IN (
      'admin_settings',           -- System config (approved)
      'user_preferences',          -- UI config (approved)
      'user_notification_preferences', -- Notification config (approved)
      'notification_channels',     -- Channel config (approved)
      'test_data_registry',        -- Test metadata (approved)
      'entity_versions_archive',   -- Archive table (approved)
      'historical_parks',          -- Historical data (approved)
      'historical_rides'           -- Historical data (approved)
    );
  
  IF jsonb_count > 0 THEN
    RAISE WARNING 'Found % unexpected JSONB columns still in database', jsonb_count;
  ELSE
    RAISE NOTICE 'SUCCESS: All production JSONB columns have been dropped';
  END IF;
END $$;

-- ============================================================================
-- STEP 10: Update database comments and documentation
-- ============================================================================

COMMENT ON DATABASE postgres IS 'ThrillWiki Database - JSONB elimination completed';

-- Log completion
DO $$
BEGIN
  RAISE NOTICE 'Phase 6 Complete: All JSONB columns dropped';
  RAISE NOTICE 'Timestamp: %', NOW();
  RAISE NOTICE 'Next steps: Update TypeScript types and documentation';
END $$;

COMMIT;

-- ============================================================================
-- POST-MIGRATION VERIFICATION QUERIES
-- ============================================================================

-- Run these queries AFTER the migration to verify success:

-- 1. List all remaining JSONB columns
/*
SELECT 
  table_name,
  column_name,
  data_type
FROM information_schema.columns
WHERE table_schema = 'public'
  AND data_type = 'jsonb'
ORDER BY table_name, column_name;
*/

-- 2. Verify relational data exists
/*
SELECT 
  'admin_audit_details' as table_name, COUNT(*) as row_count FROM admin_audit_details
UNION ALL
SELECT 'moderation_audit_metadata', COUNT(*) FROM moderation_audit_metadata
UNION ALL
SELECT 'profile_change_fields', COUNT(*) FROM profile_change_fields
UNION ALL
SELECT 'item_change_fields', COUNT(*) FROM item_change_fields
UNION ALL
SELECT 'request_breadcrumbs', COUNT(*) FROM request_breadcrumbs
UNION ALL
SELECT 'submission_metadata', COUNT(*) FROM submission_metadata
UNION ALL
SELECT 'review_photos', COUNT(*) FROM review_photos
UNION ALL
SELECT 'conflict_detail_fields', COUNT(*) FROM conflict_detail_fields;
*/

-- 3. Check for any application errors in logs
/*
SELECT 
  error_type,
  COUNT(*) as error_count,
  MAX(created_at) as last_occurred
FROM request_metadata
WHERE error_type IS NOT NULL
  AND created_at > NOW() - INTERVAL '1 hour'
GROUP BY error_type
ORDER BY error_count DESC;
*/