-- +goose Up
-- Support desk: resolver attribution, CSAT storage (ratings API by sibling agent),
-- unassigned queue index, expanded notification kinds.
-- Staff capability uses users.staff_role=support_staff (029_staff_roles).

ALTER TABLE support_tickets
  ADD COLUMN IF NOT EXISTS resolved_by_user_id UUID REFERENCES users(id) ON DELETE SET NULL,
  ADD COLUMN IF NOT EXISTS csat_token_hash BYTEA,
  ADD COLUMN IF NOT EXISTS csat_invite_sent_at TIMESTAMPTZ;

CREATE INDEX IF NOT EXISTS support_tickets_unassigned_queue_idx
  ON support_tickets (status, last_message_at DESC NULLS LAST)
  WHERE assignee_admin_user_id IS NULL;

CREATE INDEX IF NOT EXISTS support_tickets_resolved_by_idx
  ON support_tickets (resolved_by_user_id)
  WHERE resolved_by_user_id IS NOT NULL;

CREATE TABLE IF NOT EXISTS support_csat_ratings (
  id UUID PRIMARY KEY DEFAULT gen_random_uuid(),
  ticket_id UUID NOT NULL UNIQUE REFERENCES support_tickets(id) ON DELETE CASCADE,
  company_id UUID NOT NULL REFERENCES companies(id) ON DELETE CASCADE,
  user_id UUID NOT NULL REFERENCES users(id) ON DELETE CASCADE,
  score SMALLINT NOT NULL CHECK (score BETWEEN 1 AND 5),
  comment TEXT NOT NULL DEFAULT '',
  created_at TIMESTAMPTZ NOT NULL DEFAULT now()
);

CREATE INDEX IF NOT EXISTS support_csat_ratings_created_idx
  ON support_csat_ratings (created_at DESC);

ALTER TABLE support_notifications
  DROP CONSTRAINT IF EXISTS support_notifications_kind_check;

ALTER TABLE support_notifications
  ADD CONSTRAINT support_notifications_kind_check
  CHECK (kind IN (
    'ticket_created',
    'agent_reply',
    'status_changed',
    'user_reply',
    'ticket_claimed',
    'csat_requested'
  ));

-- +goose Down
ALTER TABLE support_notifications DROP CONSTRAINT IF EXISTS support_notifications_kind_check;
ALTER TABLE support_notifications
  ADD CONSTRAINT support_notifications_kind_check
  CHECK (kind IN ('ticket_created', 'agent_reply', 'status_changed', 'user_reply'));

DROP INDEX IF EXISTS support_csat_ratings_created_idx;
DROP TABLE IF EXISTS support_csat_ratings;
DROP INDEX IF EXISTS support_tickets_resolved_by_idx;
DROP INDEX IF EXISTS support_tickets_unassigned_queue_idx;

ALTER TABLE support_tickets
  DROP COLUMN IF EXISTS csat_invite_sent_at,
  DROP COLUMN IF EXISTS csat_token_hash,
  DROP COLUMN IF EXISTS resolved_by_user_id;