-- Independent governance journal; never install in a WeKnora business schema.
CREATE TABLE IF NOT EXISTS kg_object_gateway_plans (
 scope text NOT NULL,
 plan text NOT NULL,
 body bytea NOT NULL,
 PRIMARY KEY(scope,plan)
);
CREATE TABLE IF NOT EXISTS kg_object_gateway_scopes (
 scope text PRIMARY KEY,
 epoch bigint NOT NULL DEFAULT 0
);
CREATE TABLE IF NOT EXISTS kg_object_gateway_grants (
 scope text NOT NULL REFERENCES kg_object_gateway_scopes(scope),
 epoch bigint NOT NULL CHECK (epoch > 0),
 owner text NOT NULL,
 plan text NOT NULL,
 PRIMARY KEY(scope,epoch)
);
CREATE TABLE IF NOT EXISTS kg_object_gateway_intents (
 scope text NOT NULL REFERENCES kg_object_gateway_scopes(scope),
 operation text NOT NULL,
 key text NOT NULL,
 request bytea NOT NULL,
 recorded_at timestamptz NOT NULL DEFAULT clock_timestamp(),
 PRIMARY KEY(scope,operation)
);
CREATE INDEX IF NOT EXISTS kg_object_gateway_key ON kg_object_gateway_intents(scope,key);
CREATE TABLE IF NOT EXISTS kg_object_gateway_receipts (
 scope text NOT NULL,
 operation text NOT NULL,
 receipt bytea NOT NULL,
 recorded_at timestamptz NOT NULL DEFAULT clock_timestamp(),
 PRIMARY KEY(scope,operation),
 FOREIGN KEY(scope,operation) REFERENCES kg_object_gateway_intents(scope,operation)
);
CREATE TABLE IF NOT EXISTS kg_object_gateway_deliveries (
 scope text NOT NULL,
 job text NOT NULL,
 attempt_epoch bigint NOT NULL CHECK(attempt_epoch>0),
 claim bytea NOT NULL,
 grant_epoch bigint NOT NULL,
 grant_body bytea NOT NULL,
 PRIMARY KEY(scope,job,attempt_epoch),
 FOREIGN KEY(scope,grant_epoch) REFERENCES kg_object_gateway_grants(scope,epoch)
);
CREATE OR REPLACE FUNCTION kg_object_gateway_immutable() RETURNS trigger LANGUAGE plpgsql AS $$
BEGIN
 RAISE EXCEPTION 'object gateway evidence is immutable';
END;
$$;
DO $$ BEGIN
 IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_deliveries_immutable') THEN
 CREATE TRIGGER kg_object_gateway_deliveries_immutable BEFORE UPDATE OR DELETE ON kg_object_gateway_deliveries FOR EACH ROW EXECUTE FUNCTION kg_object_gateway_immutable();
 END IF;
 IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_plans_immutable') THEN
 CREATE TRIGGER kg_object_gateway_plans_immutable BEFORE UPDATE OR DELETE ON kg_object_gateway_plans FOR EACH ROW EXECUTE FUNCTION kg_object_gateway_immutable();
 END IF;
 IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_intents_immutable') THEN
 CREATE TRIGGER kg_object_gateway_intents_immutable BEFORE UPDATE OR DELETE ON kg_object_gateway_intents FOR EACH ROW EXECUTE FUNCTION kg_object_gateway_immutable();
 END IF;
 IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_receipts_immutable') THEN
 CREATE TRIGGER kg_object_gateway_receipts_immutable BEFORE UPDATE OR DELETE ON kg_object_gateway_receipts FOR EACH ROW EXECUTE FUNCTION kg_object_gateway_immutable();
 END IF;
 IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_grants_immutable') THEN
 CREATE TRIGGER kg_object_gateway_grants_immutable BEFORE UPDATE OR DELETE ON kg_object_gateway_grants FOR EACH ROW EXECUTE FUNCTION kg_object_gateway_immutable();
 END IF;
END $$;
DO $$ DECLARE t text; BEGIN
 FOREACH t IN ARRAY ARRAY['plans','grants','intents','receipts','deliveries'] LOOP
  IF NOT EXISTS (SELECT 1 FROM pg_trigger WHERE tgname='kg_object_gateway_'||t||'_no_truncate') THEN
   EXECUTE format('CREATE TRIGGER %I BEFORE TRUNCATE ON %I FOR EACH STATEMENT EXECUTE FUNCTION kg_object_gateway_immutable()', 'kg_object_gateway_'||t||'_no_truncate', 'kg_object_gateway_'||t);
  END IF;
 END LOOP;
END $$;