-- ============================================================================
-- FIX: Temp Reference Resolution for Composite Submissions
-- ============================================================================
-- This migration adds temp reference resolution to the approval transaction
-- to fix the bug where composite submissions have NULL foreign keys.
--
-- The fix ensures that when approving composite submissions:
-- 1. Temp refs (e.g., _temp_operator_ref) are resolved to actual entity IDs
-- 2. Foreign keys are properly populated before entity creation
-- 3. Dependencies are validated (must be approved before dependents)
-- ============================================================================

-- ============================================================================
-- HELPER FUNCTION: Resolve temp refs for a submission item
-- ============================================================================
-- Returns JSONB mapping ref_type → approved_entity_id
-- Example: {'operator': 'uuid-123', 'manufacturer': 'uuid-456'}
-- ============================================================================
CREATE OR REPLACE FUNCTION resolve_temp_refs_for_item(
  p_item_id UUID,
  p_submission_id UUID
)
RETURNS JSONB
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = public
AS $$
DECLARE
  v_resolved_refs JSONB := '{}'::JSONB;
  v_ref RECORD;
  v_dependency_item RECORD;
BEGIN
  -- Loop through all temp refs for this item
  FOR v_ref IN
    SELECT ref_type, ref_order_index
    FROM submission_item_temp_refs
    WHERE submission_item_id = p_item_id
  LOOP
    -- Find the submission_item with matching order_index
    SELECT id, item_type, status, approved_entity_id
    INTO v_dependency_item
    FROM submission_items
    WHERE submission_id = p_submission_id
      AND order_index = v_ref.ref_order_index;
    
    -- Validate dependency exists
    IF NOT FOUND THEN
      RAISE EXCEPTION 'Temp ref resolution failed: No submission_item found with order_index % for submission %',
        v_ref.ref_order_index, p_submission_id
        USING ERRCODE = '23503';
    END IF;
    
    -- Validate dependency is approved
    IF v_dependency_item.status != 'approved' THEN
      RAISE EXCEPTION 'Temp ref resolution failed: Dependency at order_index % (item_id=%) is not approved (status=%)',
        v_ref.ref_order_index, v_dependency_item.id, v_dependency_item.status
        USING ERRCODE = '23503';
    END IF;
    
    -- Validate approved_entity_id exists
    IF v_dependency_item.approved_entity_id IS NULL THEN
      RAISE EXCEPTION 'Temp ref resolution failed: Dependency at order_index % (item_id=%) has NULL approved_entity_id',
        v_ref.ref_order_index, v_dependency_item.id
        USING ERRCODE = '23503';
    END IF;
    
    -- Add to resolved refs map
    v_resolved_refs := v_resolved_refs || jsonb_build_object(
      v_ref.ref_type,
      v_dependency_item.approved_entity_id
    );
    
    RAISE NOTICE 'Resolved temp ref: % → % (order_index=%)',
      v_ref.ref_type,
      v_dependency_item.approved_entity_id,
      v_ref.ref_order_index;
  END LOOP;
  
  RETURN v_resolved_refs;
END;
$$;

-- ============================================================================
-- UPDATE: process_approval_transaction with temp ref resolution
-- ============================================================================
CREATE OR REPLACE FUNCTION process_approval_transaction(
  p_submission_id UUID,
  p_item_ids UUID[],
  p_moderator_id UUID,
  p_submitter_id UUID,
  p_request_id TEXT DEFAULT NULL
)
RETURNS JSONB
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = public
AS $$
DECLARE
  v_start_time TIMESTAMPTZ;
  v_result JSONB;
  v_item RECORD;
  v_item_data JSONB;
  v_resolved_refs JSONB;
  v_entity_id UUID;
  v_approval_results JSONB[] := ARRAY[]::JSONB[];
  v_final_status TEXT;
  v_all_approved BOOLEAN := TRUE;
  v_some_approved BOOLEAN := FALSE;
  v_items_processed INTEGER := 0;
BEGIN
  v_start_time := clock_timestamp();
  
  RAISE NOTICE '[%] Starting atomic approval transaction for submission %',
    COALESCE(p_request_id, 'NO_REQUEST_ID'),
    p_submission_id;
  
  -- ========================================================================
  -- STEP 1: Set session variables (transaction-scoped with is_local=true)
  -- ========================================================================
  PERFORM set_config('app.current_user_id', p_submitter_id::text, true);
  PERFORM set_config('app.submission_id', p_submission_id::text, true);
  PERFORM set_config('app.moderator_id', p_moderator_id::text, true);
  
  -- ========================================================================
  -- STEP 2: Validate submission ownership and lock status
  -- ========================================================================
  IF NOT EXISTS (
    SELECT 1 FROM content_submissions
    WHERE id = p_submission_id
      AND (assigned_to = p_moderator_id OR assigned_to IS NULL)
      AND status IN ('pending', 'partially_approved')
  ) THEN
    RAISE EXCEPTION 'Submission not found, locked by another moderator, or already processed'
      USING ERRCODE = '42501';
  END IF;
  
  -- ========================================================================
  -- STEP 3: Process each item sequentially within this transaction
  -- ========================================================================
  FOR v_item IN
    SELECT
      si.*,
      ps.name as park_name,
      ps.slug as park_slug,
      ps.description as park_description,
      ps.park_type,
      ps.status as park_status,
      ps.location_id,
      ps.operator_id,
      ps.property_owner_id,
      ps.opening_date as park_opening_date,
      ps.closing_date as park_closing_date,
      ps.opening_date_precision as park_opening_date_precision,
      ps.closing_date_precision as park_closing_date_precision,
      ps.website_url as park_website_url,
      ps.phone as park_phone,
      ps.email as park_email,
      ps.banner_image_url as park_banner_image_url,
      ps.banner_image_id as park_banner_image_id,
      ps.card_image_url as park_card_image_url,
      ps.card_image_id as park_card_image_id,
      rs.name as ride_name,
      rs.slug as ride_slug,
      rs.park_id as ride_park_id,
      rs.ride_type,
      rs.status as ride_status,
      rs.manufacturer_id,
      rs.ride_model_id,
      rs.opening_date as ride_opening_date,
      rs.closing_date as ride_closing_date,
      rs.opening_date_precision as ride_opening_date_precision,
      rs.closing_date_precision as ride_closing_date_precision,
      rs.description as ride_description,
      rs.banner_image_url as ride_banner_image_url,
      rs.banner_image_id as ride_banner_image_id,
      rs.card_image_url as ride_card_image_url,
      rs.card_image_id as ride_card_image_id,
      cs.name as company_name,
      cs.slug as company_slug,
      cs.description as company_description,
      cs.website_url as company_website_url,
      cs.founded_year,
      cs.banner_image_url as company_banner_image_url,
      cs.banner_image_id as company_banner_image_id,
      cs.card_image_url as company_card_image_url,
      cs.card_image_id as company_card_image_id,
      rms.name as ride_model_name,
      rms.slug as ride_model_slug,
      rms.manufacturer_id as ride_model_manufacturer_id,
      rms.ride_type as ride_model_ride_type,
      rms.description as ride_model_description,
      rms.banner_image_url as ride_model_banner_image_url,
      rms.banner_image_id as ride_model_banner_image_id,
      rms.card_image_url as ride_model_card_image_url,
      rms.card_image_id as ride_model_card_image_id
    FROM submission_items si
    LEFT JOIN park_submissions ps ON si.park_submission_id = ps.id
    LEFT JOIN ride_submissions rs ON si.ride_submission_id = rs.id
    LEFT JOIN company_submissions cs ON si.company_submission_id = cs.id
    LEFT JOIN ride_model_submissions rms ON si.ride_model_submission_id = rms.id
    WHERE si.id = ANY(p_item_ids)
    ORDER BY si.order_index, si.created_at
  LOOP
    BEGIN
      v_items_processed := v_items_processed + 1;
      
      -- Build item data based on entity type
      IF v_item.item_type = 'park' THEN
        v_item_data := jsonb_build_object(
          'name', v_item.park_name,
          'slug', v_item.park_slug,
          'description', v_item.park_description,
          'park_type', v_item.park_type,
          'status', v_item.park_status,
          'location_id', v_item.location_id,
          'operator_id', v_item.operator_id,
          'property_owner_id', v_item.property_owner_id,
          'opening_date', v_item.park_opening_date,
          'closing_date', v_item.park_closing_date,
          'opening_date_precision', v_item.park_opening_date_precision,
          'closing_date_precision', v_item.park_closing_date_precision,
          'website_url', v_item.park_website_url,
          'phone', v_item.park_phone,
          'email', v_item.park_email,
          'banner_image_url', v_item.park_banner_image_url,
          'banner_image_id', v_item.park_banner_image_id,
          'card_image_url', v_item.park_card_image_url,
          'card_image_id', v_item.park_card_image_id
        );
      ELSIF v_item.item_type = 'ride' THEN
        v_item_data := jsonb_build_object(
          'name', v_item.ride_name,
          'slug', v_item.ride_slug,
          'park_id', v_item.ride_park_id,
          'ride_type', v_item.ride_type,
          'status', v_item.ride_status,
          'manufacturer_id', v_item.manufacturer_id,
          'ride_model_id', v_item.ride_model_id,
          'opening_date', v_item.ride_opening_date,
          'closing_date', v_item.ride_closing_date,
          'opening_date_precision', v_item.ride_opening_date_precision,
          'closing_date_precision', v_item.ride_closing_date_precision,
          'description', v_item.ride_description,
          'banner_image_url', v_item.ride_banner_image_url,
          'banner_image_id', v_item.ride_banner_image_id,
          'card_image_url', v_item.ride_card_image_url,
          'card_image_id', v_item.ride_card_image_id
        );
      ELSIF v_item.item_type IN ('manufacturer', 'operator', 'property_owner', 'designer') THEN
        v_item_data := jsonb_build_object(
          'name', v_item.company_name,
          'slug', v_item.company_slug,
          'description', v_item.company_description,
          'website_url', v_item.company_website_url,
          'founded_year', v_item.founded_year,
          'banner_image_url', v_item.company_banner_image_url,
          'banner_image_id', v_item.company_banner_image_id,
          'card_image_url', v_item.company_card_image_url,
          'card_image_id', v_item.company_card_image_id
        );
      ELSIF v_item.item_type = 'ride_model' THEN
        v_item_data := jsonb_build_object(
          'name', v_item.ride_model_name,
          'slug', v_item.ride_model_slug,
          'manufacturer_id', v_item.ride_model_manufacturer_id,
          'ride_type', v_item.ride_model_ride_type,
          'description', v_item.ride_model_description,
          'banner_image_url', v_item.ride_model_banner_image_url,
          'banner_image_id', v_item.ride_model_banner_image_id,
          'card_image_url', v_item.ride_model_card_image_url,
          'card_image_id', v_item.ride_model_card_image_id
        );
      ELSE
        RAISE EXCEPTION 'Unsupported item_type: %', v_item.item_type;
      END IF;
      
      -- ======================================================================
      -- NEW: Resolve temp refs and update v_item_data with actual entity IDs
      -- ======================================================================
      v_resolved_refs := resolve_temp_refs_for_item(v_item.id, p_submission_id);
      
      IF v_resolved_refs IS NOT NULL AND jsonb_typeof(v_resolved_refs) = 'object' THEN
        -- Replace NULL foreign keys with resolved entity IDs
        -- For parks: operator_id, property_owner_id
        IF v_item.item_type = 'park' THEN
          IF v_resolved_refs ? 'operator' AND (v_item_data->>'operator_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('operator_id', v_resolved_refs->>'operator');
            RAISE NOTICE 'Resolved park.operator_id → %', v_resolved_refs->>'operator';
          END IF;
          IF v_resolved_refs ? 'property_owner' AND (v_item_data->>'property_owner_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('property_owner_id', v_resolved_refs->>'property_owner');
            RAISE NOTICE 'Resolved park.property_owner_id → %', v_resolved_refs->>'property_owner';
          END IF;
        END IF;
        
        -- For rides: park_id, manufacturer_id, ride_model_id
        IF v_item.item_type = 'ride' THEN
          IF v_resolved_refs ? 'park' AND (v_item_data->>'park_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('park_id', v_resolved_refs->>'park');
            RAISE NOTICE 'Resolved ride.park_id → %', v_resolved_refs->>'park';
          END IF;
          IF v_resolved_refs ? 'manufacturer' AND (v_item_data->>'manufacturer_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('manufacturer_id', v_resolved_refs->>'manufacturer');
            RAISE NOTICE 'Resolved ride.manufacturer_id → %', v_resolved_refs->>'manufacturer';
          END IF;
          IF v_resolved_refs ? 'ride_model' AND (v_item_data->>'ride_model_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('ride_model_id', v_resolved_refs->>'ride_model');
            RAISE NOTICE 'Resolved ride.ride_model_id → %', v_resolved_refs->>'ride_model';
          END IF;
        END IF;
        
        -- For ride_models: manufacturer_id
        IF v_item.item_type = 'ride_model' THEN
          IF v_resolved_refs ? 'manufacturer' AND (v_item_data->>'manufacturer_id') IS NULL THEN
            v_item_data := v_item_data || jsonb_build_object('manufacturer_id', v_resolved_refs->>'manufacturer');
            RAISE NOTICE 'Resolved ride_model.manufacturer_id → %', v_resolved_refs->>'manufacturer';
          END IF;
        END IF;
      END IF;
      
      -- Execute action based on action_type (now with resolved foreign keys)
      IF v_item.action_type = 'create' THEN
        v_entity_id := create_entity_from_submission(
          v_item.item_type,
          v_item_data,
          p_submitter_id
        );
      ELSIF v_item.action_type = 'update' THEN
        v_entity_id := update_entity_from_submission(
          v_item.item_type,
          v_item_data,
          v_item.target_entity_id,
          p_submitter_id
        );
      ELSIF v_item.action_type = 'delete' THEN
        PERFORM delete_entity_from_submission(
          v_item.item_type,
          v_item.target_entity_id,
          p_submitter_id
        );
        v_entity_id := v_item.target_entity_id;
      ELSE
        RAISE EXCEPTION 'Unknown action_type: %', v_item.action_type;
      END IF;
      
      -- Update submission_item to approved status
      UPDATE submission_items
      SET
        status = 'approved',
        approved_entity_id = v_entity_id,
        updated_at = NOW()
      WHERE id = v_item.id;
      
      -- Track success
      v_approval_results := array_append(
        v_approval_results,
        jsonb_build_object(
          'itemId', v_item.id,
          'entityId', v_entity_id,
          'itemType', v_item.item_type,
          'actionType', v_item.action_type,
          'success', true
        )
      );
      
      v_some_approved := TRUE;
      
      RAISE NOTICE '[%] Approved item % (type=%s, action=%s, entityId=%s)',
        COALESCE(p_request_id, 'NO_REQUEST_ID'),
        v_item.id,
        v_item.item_type,
        v_item.action_type,
        v_entity_id;
        
    EXCEPTION WHEN OTHERS THEN
      -- Log error but continue processing remaining items
      RAISE WARNING '[%] Item % failed: % (SQLSTATE: %)',
        COALESCE(p_request_id, 'NO_REQUEST_ID'),
        v_item.id,
        SQLERRM,
        SQLSTATE;
      
      -- Update submission_item to rejected status
      UPDATE submission_items
      SET
        status = 'rejected',
        rejection_reason = SQLERRM,
        updated_at = NOW()
      WHERE id = v_item.id;
      
      -- Track failure
      v_approval_results := array_append(
        v_approval_results,
        jsonb_build_object(
          'itemId', v_item.id,
          'itemType', v_item.item_type,
          'actionType', v_item.action_type,
          'success', false,
          'error', SQLERRM
        )
      );
      
      v_all_approved := FALSE;
    END;
  END LOOP;
  
  -- ========================================================================
  -- STEP 4: Determine final submission status
  -- ========================================================================
  v_final_status := CASE
    WHEN v_all_approved THEN 'approved'
    WHEN v_some_approved THEN 'partially_approved'
    ELSE 'rejected'
  END;
  
  -- ========================================================================
  -- STEP 5: Update submission status
  -- ========================================================================
  UPDATE content_submissions
  SET
    status = v_final_status,
    reviewer_id = p_moderator_id,
    reviewed_at = NOW(),
    assigned_to = NULL,
    locked_until = NULL
  WHERE id = p_submission_id;
  
  -- ========================================================================
  -- STEP 6: Log metrics
  -- ========================================================================
  INSERT INTO approval_transaction_metrics (
    submission_id,
    moderator_id,
    submitter_id,
    items_count,
    duration_ms,
    success,
    request_id
  ) VALUES (
    p_submission_id,
    p_moderator_id,
    p_submitter_id,
    array_length(p_item_ids, 1),
    EXTRACT(EPOCH FROM (clock_timestamp() - v_start_time)) * 1000,
    v_all_approved,
    p_request_id
  );
  
  -- ========================================================================
  -- STEP 7: Build result
  -- ========================================================================
  v_result := jsonb_build_object(
    'success', TRUE,
    'results', to_jsonb(v_approval_results),
    'submissionStatus', v_final_status,
    'itemsProcessed', v_items_processed,
    'allApproved', v_all_approved,
    'someApproved', v_some_approved
  );
  
  -- Clear session variables (defense-in-depth)
  PERFORM set_config('app.current_user_id', '', true);
  PERFORM set_config('app.submission_id', '', true);
  PERFORM set_config('app.moderator_id', '', true);
  
  RAISE NOTICE '[%] Transaction completed successfully in %ms',
    COALESCE(p_request_id, 'NO_REQUEST_ID'),
    EXTRACT(EPOCH FROM (clock_timestamp() - v_start_time)) * 1000;
  
  RETURN v_result;
  
EXCEPTION WHEN OTHERS THEN
  -- ANY unhandled error triggers automatic ROLLBACK
  RAISE WARNING '[%] Transaction failed, rolling back: % (SQLSTATE: %)',
    COALESCE(p_request_id, 'NO_REQUEST_ID'),
    SQLERRM,
    SQLSTATE;
  
  -- Log failed transaction metrics
  INSERT INTO approval_transaction_metrics (
    submission_id,
    moderator_id,
    submitter_id,
    items_count,
    duration_ms,
    success,
    rollback_triggered,
    error_message,
    request_id
  ) VALUES (
    p_submission_id,
    p_moderator_id,
    p_submitter_id,
    array_length(p_item_ids, 1),
    EXTRACT(EPOCH FROM (clock_timestamp() - v_start_time)) * 1000,
    FALSE,
    TRUE,
    SQLERRM,
    p_request_id
  );
  
  -- Clear session variables before re-raising
  PERFORM set_config('app.current_user_id', '', true);
  PERFORM set_config('app.submission_id', '', true);
  PERFORM set_config('app.moderator_id', '', true);
  
  -- Re-raise the exception to trigger ROLLBACK
  RAISE;
END;
$$;

-- Grant execute permissions
GRANT EXECUTE ON FUNCTION resolve_temp_refs_for_item TO authenticated;