-- Preview fields for creatives pipeline (ads + RRSS placement mocks)
-- Idempotent.

alter table public.creatives
  add column if not exists channel text;

alter table public.creatives
  add column if not exists placement text;

alter table public.creatives
  add column if not exists format text;

alter table public.creatives
  add column if not exists headline text;

alter table public.creatives
  add column if not exists primary_text text;

alter table public.creatives
  add column if not exists description text;

alter table public.creatives
  add column if not exists cta text;

alter table public.creatives
  add column if not exists media_url text;

alter table public.creatives
  add column if not exists brand_name text;

alter table public.creatives
  add column if not exists landing_url text;

alter table public.creatives
  add column if not exists meta jsonb not null default '{}'::jsonb;

-- Soft checks (nullable for legacy rows)
do $$
begin
  if not exists (
    select 1 from pg_constraint where conname = 'creatives_channel_check'
  ) then
    alter table public.creatives
      add constraint creatives_channel_check
      check (
        channel is null
        or channel in (
          'meta_ads',
          'google_ads',
          'instagram',
          'facebook',
          'linkedin',
          'tiktok',
          'stories',
          'other'
        )
      );
  end if;
end $$;

do $$
begin
  if not exists (
    select 1 from pg_constraint where conname = 'creatives_format_check'
  ) then
    alter table public.creatives
      add constraint creatives_format_check
      check (
        format is null
        or format in (
          'image',
          'video',
          'carousel',
          'reel',
          'story',
          'rsa',
          'pmax',
          'other'
        )
      );
  end if;
end $$;

comment on column public.creatives.channel is
  'Surface: meta_ads | google_ads | instagram | facebook | linkedin | stories…';
comment on column public.creatives.placement is
  'Placement mock: feed | stories | reels | search | display…';
comment on column public.creatives.media_url is
  'Public or signed URL for creative media preview';