-- Fix: User Personal Information Could Be Stolen by Anyone
-- Create a secure view that enforces field-level privacy using get_filtered_profile function

-- Step 1: Create a secure view that uses get_filtered_profile for field-level privacy
CREATE OR REPLACE VIEW public.filtered_profiles 
WITH (security_invoker = true)
AS
SELECT 
  p.id,
  p.user_id,
  p.username,
  p.display_name,
  p.privacy_level,
  p.created_at,
  p.updated_at,
  -- Conditionally include sensitive fields based on privacy settings
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'bio'
  ) THEN p.bio ELSE NULL END as bio,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'avatar_url'
  ) THEN p.avatar_url ELSE NULL END as avatar_url,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'avatar_image_id'
  ) THEN p.avatar_image_id ELSE NULL END as avatar_image_id,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'preferred_pronouns'
  ) THEN p.preferred_pronouns ELSE NULL END as preferred_pronouns,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'preferred_pronouns'
  ) THEN p.show_pronouns ELSE false END as show_pronouns,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'personal_location'
  ) THEN p.personal_location ELSE NULL END as personal_location,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'location_id'
  ) THEN p.location_id ELSE NULL END as location_id,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'home_park_id'
  ) THEN p.home_park_id ELSE NULL END as home_park_id,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'date_of_birth'
  ) THEN p.date_of_birth ELSE NULL END as date_of_birth,
  
  -- Always include safe metadata fields
  p.timezone,
  p.preferred_language,
  p.theme_preference,
  
  -- Include activity stats based on privacy settings
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'ride_count'
  ) THEN p.ride_count ELSE 0 END as ride_count,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'ride_count'
  ) THEN p.coaster_count ELSE 0 END as coaster_count,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'ride_count'
  ) THEN p.park_count ELSE 0 END as park_count,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'ride_count'
  ) THEN p.review_count ELSE 0 END as review_count,
  
  CASE WHEN can_view_profile_field(
    COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid),
    p.user_id,
    'ride_count'
  ) THEN p.reputation_score ELSE 0 END as reputation_score,
  
  -- Never expose banned status except to moderators and the user themselves
  CASE WHEN (auth.uid() = p.user_id OR is_moderator(COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid))) 
    THEN p.banned ELSE false END as banned
FROM public.profiles p
WHERE 
  -- Only show non-banned profiles to non-moderators
  (NOT p.banned OR auth.uid() = p.user_id OR is_moderator(COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid)))
  AND
  -- Only show public or own profiles
  (p.privacy_level = 'public' OR auth.uid() = p.user_id OR is_moderator(COALESCE(auth.uid(), '00000000-0000-0000-0000-000000000000'::uuid)));

-- Add comment explaining the view
COMMENT ON VIEW public.filtered_profiles IS 
'Secure view that enforces field-level privacy for profile data. Uses can_view_profile_field function to filter sensitive fields based on user privacy settings. This view should be used for all profile queries where the viewer may not have full access rights.';

-- Grant access to the view
GRANT SELECT ON public.filtered_profiles TO authenticated;
GRANT SELECT ON public.filtered_profiles TO anon;
GRANT SELECT ON public.filtered_profiles TO service_role;

-- Step 2: Tighten the base profiles table RLS policies
-- Drop the overly permissive "Authenticated users can view public profiles" policy
DROP POLICY IF EXISTS "Authenticated users can view public profiles" ON public.profiles;

-- Create a more restrictive policy: users can only view their own full profile via direct table access
-- Other users should use the filtered_profiles view
CREATE POLICY "Users view own profile or use filtered view"
ON public.profiles
FOR SELECT
TO authenticated
USING (
  -- Users can see their own complete profile
  auth.uid() = user_id
  -- Moderators can see all profiles for moderation purposes
  OR is_moderator(auth.uid())
);

-- Keep the existing policies for users viewing their own profiles
-- The "Users can view their own complete profile" policy may be redundant now, but we'll keep it for clarity

-- Step 3: Add helpful documentation
COMMENT ON TABLE public.profiles IS 
'User profiles table. Direct SELECT access is restricted - use the filtered_profiles view for privacy-respecting queries when viewing other users'' profiles. Only profile owners and moderators have direct table access.';