BEGIN;

DO $$
BEGIN
    IF to_regclass('public.project_databases') IS NULL
       OR to_regclass('public.user_project_membership') IS NULL THEN
        RAISE EXCEPTION '033_metadata_project_settings must run in the project metadata database';
    END IF;
END $$;

ALTER TABLE public.projects
    ADD COLUMN IF NOT EXISTS settings jsonb NOT NULL DEFAULT '{}'::jsonb;

DO $$
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM pg_constraint
        WHERE conrelid = 'public.projects'::regclass
          AND conname = 'projects_settings_object_check'
    ) THEN
        ALTER TABLE public.projects
            ADD CONSTRAINT projects_settings_object_check
            CHECK (jsonb_typeof(settings) = 'object');
    END IF;

    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_schema = 'public' AND table_name = 'projects'
          AND column_name = 'scada_monitoring_interval_seconds'
    ) THEN
        IF EXISTS (
            SELECT 1 FROM public.projects
            WHERE scada_monitoring_interval_seconds IS NOT NULL
              AND settings ? 'scada_monitoring_interval_seconds'
              AND settings->'scada_monitoring_interval_seconds'
                  IS DISTINCT FROM to_jsonb(scada_monitoring_interval_seconds)
        ) THEN
            RAISE EXCEPTION 'Conflicting SCADA monitoring intervals; resolve before migration';
        END IF;

        UPDATE public.projects
        SET settings = settings || jsonb_build_object(
            'scada_monitoring_interval_seconds', scada_monitoring_interval_seconds
        )
        WHERE scada_monitoring_interval_seconds IS NOT NULL;

        ALTER TABLE public.projects DROP COLUMN scada_monitoring_interval_seconds;
    END IF;
END $$;

COMMENT ON COLUMN public.projects.settings IS
    '项目级通用配置（JSON 对象，不存放密钥）；scada_monitoring_interval_seconds 为监测任务间隔秒数。';

COMMIT;