-- 0014_items_public_fields.sql
--
-- Phase 4d: public-listing fields so flexsiebels.de (and any future public
-- consumer) can render m's portfolio from projax directly via the MCP
-- surface. projax becomes the single source of truth for "which projects
-- are public, and what should the public copy say about them?"
--
-- Five additive, default-safe columns:
--   public               — single boolean toggle; 95% of items stay false
--   public_description   — public-facing prose (markdown), free of internal
--                          notes that live in content_md
--   public_live_url      — production/demo URL if the project has one
--   public_source_url    — repo URL if m wants to expose the source
--   public_screenshots   — ordered list of image URLs; projax stores
--                          pointers, never bytes (PER discipline §"Out of
--                          scope (permanent — 2026-05-17)")
--
-- The partial index speeds up the "give me everything public" query that
-- flexsiebels and the optional /tree filter chip will issue. We keep it
-- partial because the predicate is highly selective (only public rows).
-- items_unified picks the new columns up automatically via SELECT *.

ALTER TABLE projax.items
  ADD COLUMN IF NOT EXISTS public             boolean NOT NULL DEFAULT false,
  ADD COLUMN IF NOT EXISTS public_description text    NOT NULL DEFAULT '',
  ADD COLUMN IF NOT EXISTS public_live_url    text    NOT NULL DEFAULT '',
  ADD COLUMN IF NOT EXISTS public_source_url  text    NOT NULL DEFAULT '',
  ADD COLUMN IF NOT EXISTS public_screenshots text[]  NOT NULL DEFAULT '{}';

CREATE INDEX IF NOT EXISTS items_public_idx
  ON projax.items (public)
  WHERE public = true;

-- items_unified is the canonical read shape every web/MCP code path uses.
-- The five new columns have to flow through it, otherwise Item.* writes
-- silently drop on read. DROP+CREATE because Postgres won't append columns
-- to an existing view via CREATE OR REPLACE.

DROP VIEW IF EXISTS projax.items_unified;
CREATE VIEW projax.items_unified AS
SELECT
  i.id,
  i.kind,
  i.title,
  i.slug,
  i.paths,
  i.parent_ids,
  i.content_md,
  i.aliases,
  i.metadata,
  i.status,
  i.pinned,
  i.archived,
  i.start_time,
  i.end_time,
  'projax'::text AS source,
  (SELECT l.ref_id FROM projax.item_links l
   WHERE l.item_id = i.id AND l.ref_type = 'mai-project' LIMIT 1) AS source_ref_id,
  i.tags,
  i.management,
  i.public,
  i.public_description,
  i.public_live_url,
  i.public_source_url,
  i.public_screenshots,
  i.created_at,
  i.updated_at
FROM projax.items i
WHERE i.deleted_at IS NULL;

DO $own$ BEGIN
  IF EXISTS (SELECT 1 FROM pg_roles WHERE rolname = 'projax_admin') THEN
    EXECUTE 'ALTER VIEW projax.items_unified OWNER TO projax_admin';
    EXECUTE 'GRANT SELECT ON projax.items_unified TO projax_admin';
  END IF;
END $own$;