-- Per-website AI prompt instances (editable copies) with their own public links.

CREATE TABLE IF NOT EXISTS domain_ai_prompts (
  id                  BIGSERIAL PRIMARY KEY,
  domain_id           BIGINT NOT NULL REFERENCES domains (id) ON DELETE CASCADE,
  source_template_id  BIGINT REFERENCES ai_prompt_templates (id) ON DELETE SET NULL,
  name                VARCHAR(255) NOT NULL,
  body                TEXT NOT NULL,
  public_id           VARCHAR(32) NOT NULL,
  sort_order          INT NOT NULL DEFAULT 0,
  created_at          TIMESTAMPTZ NOT NULL DEFAULT now(),
  updated_at          TIMESTAMPTZ NOT NULL DEFAULT now(),
  CONSTRAINT domain_ai_prompts_public_id_unique UNIQUE (public_id)
);

CREATE INDEX IF NOT EXISTS idx_domain_ai_prompts_domain_id
  ON domain_ai_prompts (domain_id, sort_order, id);

CREATE INDEX IF NOT EXISTS idx_domain_ai_prompts_source_template_id
  ON domain_ai_prompts (source_template_id);

CREATE OR REPLACE FUNCTION domain_ai_prompts_set_updated_at()
RETURNS TRIGGER AS $$
BEGIN
  NEW.updated_at = now();
  RETURN NEW;
END;
$$ LANGUAGE plpgsql;

DROP TRIGGER IF EXISTS domain_ai_prompts_set_updated_at ON domain_ai_prompts;
CREATE TRIGGER domain_ai_prompts_set_updated_at
  BEFORE UPDATE ON domain_ai_prompts
  FOR EACH ROW
  EXECUTE FUNCTION domain_ai_prompts_set_updated_at();

-- Copy existing assignments into editable instances (one public id each).
DO $$
DECLARE
  r RECORD;
  pid TEXT;
BEGIN
  IF EXISTS (
    SELECT 1 FROM information_schema.tables
    WHERE table_name = 'domain_ai_prompt_templates'
  ) THEN
    FOR r IN
      SELECT
        l.domain_id,
        l.template_id,
        l.sort_order,
        t.name,
        t.body
      FROM domain_ai_prompt_templates l
      JOIN ai_prompt_templates t ON t.id = l.template_id
      ORDER BY l.domain_id, l.sort_order, l.template_id
    LOOP
      LOOP
        pid := encode(gen_random_bytes(12), 'hex');
        EXIT WHEN NOT EXISTS (
          SELECT 1 FROM domain_ai_prompts WHERE public_id = pid
        );
      END LOOP;

      INSERT INTO domain_ai_prompts (
        domain_id, source_template_id, name, body, public_id, sort_order
      ) VALUES (
        r.domain_id, r.template_id, r.name, r.body, pid, r.sort_order
      );
    END LOOP;
  END IF;
END $$;

DROP TABLE IF EXISTS domain_ai_prompt_templates;