-- CreateTable
CREATE TABLE "claude_questions" (
    "id" TEXT NOT NULL,
    "story_id" TEXT NOT NULL,
    "task_id" TEXT,
    "product_id" TEXT NOT NULL,
    "asked_by" TEXT NOT NULL,
    "question" TEXT NOT NULL,
    "options" JSONB,
    "status" TEXT NOT NULL,
    "answer" TEXT,
    "answered_by" TEXT,
    "answered_at" TIMESTAMP(3),
    "created_at" TIMESTAMP(3) NOT NULL DEFAULT CURRENT_TIMESTAMP,
    "expires_at" TIMESTAMP(3) NOT NULL,

    CONSTRAINT "claude_questions_pkey" PRIMARY KEY ("id")
);

-- CreateIndex
CREATE INDEX "claude_questions_story_id_status_idx" ON "claude_questions"("story_id", "status");

-- CreateIndex
CREATE INDEX "claude_questions_product_id_status_idx" ON "claude_questions"("product_id", "status");

-- CreateIndex
CREATE INDEX "claude_questions_status_expires_at_idx" ON "claude_questions"("status", "expires_at");

-- AddForeignKey
ALTER TABLE "claude_questions" ADD CONSTRAINT "claude_questions_story_id_fkey" FOREIGN KEY ("story_id") REFERENCES "stories"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "claude_questions" ADD CONSTRAINT "claude_questions_task_id_fkey" FOREIGN KEY ("task_id") REFERENCES "tasks"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "claude_questions" ADD CONSTRAINT "claude_questions_product_id_fkey" FOREIGN KEY ("product_id") REFERENCES "products"("id") ON DELETE CASCADE ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "claude_questions" ADD CONSTRAINT "claude_questions_asked_by_fkey" FOREIGN KEY ("asked_by") REFERENCES "users"("id") ON DELETE RESTRICT ON UPDATE CASCADE;

-- AddForeignKey
ALTER TABLE "claude_questions" ADD CONSTRAINT "claude_questions_answered_by_fkey" FOREIGN KEY ("answered_by") REFERENCES "users"("id") ON DELETE SET NULL ON UPDATE CASCADE;

-- ST-1101: Postgres LISTEN/NOTIFY voor het Claude vraag-antwoord-kanaal (M11).
--
-- AFTER INSERT/UPDATE-trigger op claude_questions emit een JSON-payload op het
-- BESTAANDE `scrum4me_changes`-kanaal (zelfde als ST-801) met `entity: 'question'`.
--
-- De solo-realtime SSE-route `/api/realtime/solo` MOET in ST-1104 een
-- `if (payload.entity === 'question') return false`-filter krijgen — anders
-- ontvangen solo-clients ongewenst question-events.
--
-- De nieuwe user-scoped SSE-route `/api/realtime/notifications` (ST-1104)
-- abonneert zich op hetzelfde kanaal en filtert op `entity === 'question'`
-- + product-toegang van de gebruiker.
--
-- DELETE wordt niet ondersteund — questions gaan naar status='answered',
-- 'cancelled' of 'expired', niet weg.
--
-- Payload shape:
--   { op: 'I' | 'U',
--     entity: 'question',
--     id: text,
--     product_id: text,
--     story_id: text,
--     task_id: text|null,
--     assignee_id: text|null,   // story.assignee_id, voor "wacht op jou"-emphase
--     status: 'open'|'answered'|'cancelled'|'expired' }

CREATE OR REPLACE FUNCTION notify_question_change() RETURNS trigger AS $$
DECLARE
  story_row record;
  payload jsonb;
BEGIN
  SELECT assignee_id INTO story_row FROM stories WHERE id = NEW.story_id;

  payload := jsonb_build_object(
    'op', CASE TG_OP
            WHEN 'INSERT' THEN 'I'
            WHEN 'UPDATE' THEN 'U'
          END,
    'entity', 'question',
    'id', NEW.id,
    'product_id', NEW.product_id,
    'story_id', NEW.story_id,
    'task_id', NEW.task_id,
    'assignee_id', story_row.assignee_id,
    'status', NEW.status
  );

  PERFORM pg_notify('scrum4me_changes', payload::text);
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS claude_questions_notify ON claude_questions;
CREATE TRIGGER claude_questions_notify
  AFTER INSERT OR UPDATE ON claude_questions
  FOR EACH ROW EXECUTE FUNCTION notify_question_change();