-- pgTAP: server admin role + audit log (Fase 13.1)
-- Run with: psql -U postgres -d postgres -f supabase/tests/016_server_admin.sql
--
-- Verifies:
--   * `public.server_admins` table shape: PK, FKs, RLS enabled, no
--     INSERT/UPDATE/DELETE policies (only SELECT).
--   * `public.is_server_admin(uuid)` exists, STABLE, SECURITY DEFINER,
--     returns boolean, has a default arg.
--   * `public.admin_actions` table shape: append-only (SELECT policy only),
--     RLS enabled, indexes present, actor_id FK is RESTRICT.
--
-- The runtime semantics (non-admin denied SELECT, audit RPCs only write via
-- SECURITY DEFINER) live in the Vitest integration suite which connects as a
-- non-superuser. pgTAP runs as postgres and bypasses RLS.

CREATE EXTENSION IF NOT EXISTS pgtap;

BEGIN;
SELECT plan(20);

-- ── server_admins table shape ───────────────────────────────────────────────

SELECT has_table(
    'public', 'server_admins',
    'SA-T01: public.server_admins table exists'
);

SELECT has_column(
    'public', 'server_admins', 'user_id',
    'SA-T02: server_admins.user_id column exists'
);

SELECT col_is_pk(
    'public', 'server_admins', 'user_id',
    'SA-T03: server_admins.user_id is the primary key'
);

SELECT col_not_null(
    'public', 'server_admins', 'granted_at',
    'SA-T04: server_admins.granted_at is NOT NULL'
);

-- RLS enabled
SELECT ok(
    (SELECT relrowsecurity FROM pg_class WHERE relname = 'server_admins' AND relnamespace = 'public'::regnamespace),
    'SA-T05: RLS is enabled on server_admins'
);

-- Only a SELECT policy — no INSERT/UPDATE/DELETE policies.
SELECT results_eq(
    $$ SELECT cmd::text FROM pg_policies
       WHERE schemaname = 'public' AND tablename = 'server_admins'
       ORDER BY cmd $$,
    $$ VALUES ('SELECT') $$,
    'SA-T06: server_admins has exactly one policy and it is SELECT-only'
);

-- ── is_server_admin function ────────────────────────────────────────────────

SELECT has_function(
    'public', 'is_server_admin', ARRAY['uuid'],
    'SA-T07: public.is_server_admin(uuid) exists'
);

SELECT function_returns(
    'public', 'is_server_admin', ARRAY['uuid'], 'boolean',
    'SA-T08: is_server_admin() returns boolean'
);

SELECT volatility_is(
    'public', 'is_server_admin', ARRAY['uuid'], 'stable',
    'SA-T09: is_server_admin() is STABLE'
);

-- Must be SECURITY DEFINER so non-admin callers can answer "am I admin?"
-- without escalating to SELECT-all on server_admins.
SELECT is(
    (SELECT prosecdef FROM pg_proc WHERE proname = 'is_server_admin' AND pronamespace = 'public'::regnamespace),
    true,
    'SA-T10: is_server_admin() is SECURITY DEFINER'
);

-- ── admin_actions table shape ───────────────────────────────────────────────

SELECT has_table(
    'public', 'admin_actions',
    'SA-T11: public.admin_actions table exists'
);

SELECT col_is_pk(
    'public', 'admin_actions', 'id',
    'SA-T12: admin_actions.id is the primary key'
);

SELECT col_not_null(
    'public', 'admin_actions', 'actor_id',
    'SA-T13: admin_actions.actor_id is NOT NULL'
);

SELECT col_not_null(
    'public', 'admin_actions', 'action',
    'SA-T14: admin_actions.action is NOT NULL'
);

SELECT col_type_is(
    'public', 'admin_actions', 'payload', 'jsonb',
    'SA-T15: admin_actions.payload is jsonb'
);

-- RLS enabled
SELECT ok(
    (SELECT relrowsecurity FROM pg_class WHERE relname = 'admin_actions' AND relnamespace = 'public'::regnamespace),
    'SA-T16: RLS is enabled on admin_actions'
);

-- Append-only: SELECT is the ONLY policy. No INSERT/UPDATE/DELETE policies →
-- non-superuser cannot write to admin_actions via REST under any
-- circumstances. Only SECURITY DEFINER RPCs (migration 025) write.
SELECT results_eq(
    $$ SELECT cmd::text FROM pg_policies
       WHERE schemaname = 'public' AND tablename = 'admin_actions'
       ORDER BY cmd $$,
    $$ VALUES ('SELECT') $$,
    'SA-T17: admin_actions has exactly one policy and it is SELECT-only (append-only)'
);

-- actor_id FK must RESTRICT so the audit trail never silently loses rows
-- when a user is deleted.
SELECT results_eq(
    $$ SELECT confdeltype::text FROM pg_constraint
       WHERE conrelid = 'public.admin_actions'::regclass
       AND   conname = 'admin_actions_actor_id_fkey' $$,
    $$ VALUES ('r') $$,  -- 'r' = RESTRICT
    'SA-T18: admin_actions.actor_id FK uses RESTRICT'
);

-- Indexes for the common queries
SELECT has_index(
    'public', 'admin_actions', 'admin_actions_actor_idx',
    'SA-T19: admin_actions has (actor_id, created_at DESC) index'
);

SELECT has_index(
    'public', 'admin_actions', 'admin_actions_target_idx',
    'SA-T20: admin_actions has (target_type, target_id) index'
);

SELECT * FROM finish();
ROLLBACK;