-- ============================================================================
-- 0004_water_log_admin.sql
--
-- Adds the three water-log tables that the Drizzle schema
-- (db/schema/water-log.ts) declares but 0001_init.sql never created.
-- The corresponding actions live in src/actions/water-log/* and were
-- stubbed as "Water log is not configured in the SaaS rebuild" before
-- this migration; calling them raised "relation does not exist" and
-- /api/water-admin-auth returned a 500 "Server error" to the field.
--
--   water_admin_settings   — per-brand admin PIN + portal config
--   water_admin_sessions   — /water/admin sign-in sessions
--   water_audit_log        — who changed what, when
--
-- All three are brand-scoped with RLS, matching the 0001 pattern
-- (`brand_id = current_brand_id() OR is_platform_admin()`).
-- ============================================================================

-- ============================================================================
-- water_admin_settings
-- ============================================================================
CREATE TABLE IF NOT EXISTS water_admin_settings (
  brand_id UUID PRIMARY KEY REFERENCES brands(id) ON DELETE CASCADE,
  -- Hashed admin PIN, format: scrypt$N$r$p$salt_b64$hash_b64
  -- (see src/lib/water-log-pin.ts). Nullable so a brand can exist
  -- without an admin PIN until one is generated.
  pin_hash TEXT,
  enabled BOOLEAN NOT NULL DEFAULT true,
  session_duration_hours INTEGER NOT NULL DEFAULT 4,
  can_edit_entries BOOLEAN NOT NULL DEFAULT true,
  can_delete_entries BOOLEAN NOT NULL DEFAULT true,
  can_export_csv BOOLEAN NOT NULL DEFAULT true,
  alert_phone TEXT,
  alerts_enabled BOOLEAN NOT NULL DEFAULT false,
  updated_at TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_by UUID REFERENCES admin_users(id)
);

-- ============================================================================
-- water_admin_sessions
-- ============================================================================
CREATE TABLE IF NOT EXISTS water_admin_sessions (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  brand_id UUID NOT NULL REFERENCES brands(id) ON DELETE CASCADE,
  admin_user_id UUID NOT NULL REFERENCES admin_users(id) ON DELETE CASCADE,
  -- Snapshot of the PIN hash used to sign in, so a subsequent PIN
  -- rotation invalidates the session without us having to walk every row.
  pin_hash_used TEXT NOT NULL,
  expires_at TIMESTAMPTZ NOT NULL,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS water_admin_sessions_admin_idx
  ON water_admin_sessions (admin_user_id, expires_at);

-- ============================================================================
-- water_audit_log
-- ============================================================================
CREATE TABLE IF NOT EXISTS water_audit_log (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  brand_id UUID NOT NULL REFERENCES brands(id) ON DELETE CASCADE,
  actor_id UUID REFERENCES admin_users(id),
  actor_label TEXT NOT NULL,
  action TEXT NOT NULL,
  entity_type TEXT NOT NULL,
  entity_id UUID,
  details JSONB,
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS water_audit_log_brand_recent_idx
  ON water_audit_log (brand_id, created_at);

-- ============================================================================
-- RLS
-- ============================================================================
ALTER TABLE water_admin_settings ENABLE ROW LEVEL SECURITY;
ALTER TABLE water_admin_settings FORCE ROW LEVEL SECURITY;

ALTER TABLE water_admin_sessions ENABLE ROW LEVEL SECURITY;
ALTER TABLE water_admin_sessions FORCE ROW LEVEL SECURITY;

ALTER TABLE water_audit_log ENABLE ROW LEVEL SECURITY;
ALTER TABLE water_audit_log FORCE ROW LEVEL SECURITY;

-- ============================================================================
-- Policies
-- ============================================================================

-- water_admin_settings: PK is brand_id, so a single per-brand row.
DROP POLICY IF EXISTS tenant_isolation ON water_admin_settings;
CREATE POLICY tenant_isolation ON water_admin_settings
  FOR ALL
  USING (brand_id = current_brand_id() OR is_platform_admin())
  WITH CHECK (brand_id = current_brand_id() OR is_platform_admin());

-- water_admin_sessions: keyed off brand_id directly.
DROP POLICY IF EXISTS tenant_isolation ON water_admin_sessions;
CREATE POLICY tenant_isolation ON water_admin_sessions
  FOR ALL
  USING (brand_id = current_brand_id() OR is_platform_admin())
  WITH CHECK (brand_id = current_brand_id() OR is_platform_admin());

-- water_audit_log: keyed off brand_id directly.
DROP POLICY IF EXISTS tenant_isolation ON water_audit_log;
CREATE POLICY tenant_isolation ON water_audit_log
  FOR ALL
  USING (brand_id = current_brand_id() OR is_platform_admin())
  WITH CHECK (brand_id = current_brand_id() OR is_platform_admin());