-- ============================================================================
-- Trigger de versionamento automático de clinical_notes
-- ----------------------------------------------------------------------------
-- A cada INSERT ou UPDATE relevante em clinical_notes, cria snapshot completo
-- em clinical_note_versions. Função é SECURITY DEFINER pra bypassar a RLS
-- (que bloqueia INSERT direto em clinical_note_versions).
--
-- Versionamento dispara em:
--   • INSERT — registra criação (version_number = 1)
--   • UPDATE em content_text, content_structured ou title — registra edição
--
-- Mudanças em pinned/is_draft NÃO disparam versionamento (mudança de UI/state,
-- não de conteúdo).
-- ============================================================================

BEGIN;

CREATE OR REPLACE FUNCTION public.fn_clinical_note_version()
RETURNS trigger
LANGUAGE plpgsql
SECURITY DEFINER
SET search_path = public
AS $$
DECLARE
    next_version integer;
    reason text;
BEGIN
    SELECT COALESCE(MAX(version_number), 0) + 1
      INTO next_version
      FROM public.clinical_note_versions
     WHERE note_id = NEW.id;

    IF TG_OP = 'INSERT' THEN
        reason := 'criacao';
    ELSIF TG_OP = 'UPDATE' THEN
        IF NEW.deleted_at IS NOT NULL AND OLD.deleted_at IS NULL THEN
            reason := 'soft_delete';
        ELSIF NEW.deleted_at IS NULL AND OLD.deleted_at IS NOT NULL THEN
            reason := 'restore';
        ELSE
            reason := 'edicao';
        END IF;
    ELSE
        reason := 'desconhecido';
    END IF;

    INSERT INTO public.clinical_note_versions (
        note_id,
        tenant_id,
        version_number,
        title,
        content_text,
        content_structured,
        change_reason,
        created_at,
        created_by
    ) VALUES (
        NEW.id,
        NEW.tenant_id,
        next_version,
        NEW.title,
        NEW.content_text,
        NEW.content_structured,
        reason,
        now(),
        COALESCE(NEW.updated_by, NEW.created_by)
    );

    RETURN NEW;
END;
$$;

COMMENT ON FUNCTION public.fn_clinical_note_version() IS
    'Snapshot completo de clinical_notes a cada INSERT/UPDATE relevante. SECURITY DEFINER bypassa RLS pra escrever em clinical_note_versions (que bloqueia INSERT direto).';

CREATE TRIGGER trg_clinical_notes_version_insert
    AFTER INSERT ON public.clinical_notes
    FOR EACH ROW
    EXECUTE FUNCTION public.fn_clinical_note_version();

CREATE TRIGGER trg_clinical_notes_version_update
    AFTER UPDATE OF content_text, content_structured, title, deleted_at
    ON public.clinical_notes
    FOR EACH ROW
    WHEN (
        OLD.content_text IS DISTINCT FROM NEW.content_text
        OR OLD.content_structured IS DISTINCT FROM NEW.content_structured
        OR OLD.title IS DISTINCT FROM NEW.title
        OR OLD.deleted_at IS DISTINCT FROM NEW.deleted_at
    )
    EXECUTE FUNCTION public.fn_clinical_note_version();

-- ──────────────────────────────────────────────────────────────────────────
-- Trigger para updated_at automático
-- ──────────────────────────────────────────────────────────────────────────

CREATE OR REPLACE FUNCTION public.fn_clinical_notes_updated_at()
RETURNS trigger
LANGUAGE plpgsql
AS $$
BEGIN
    NEW.updated_at := now();
    RETURN NEW;
END;
$$;

CREATE TRIGGER trg_clinical_notes_updated_at
    BEFORE UPDATE ON public.clinical_notes
    FOR EACH ROW
    EXECUTE FUNCTION public.fn_clinical_notes_updated_at();

CREATE TRIGGER trg_clinical_note_templates_updated_at
    BEFORE UPDATE ON public.clinical_note_templates
    FOR EACH ROW
    EXECUTE FUNCTION public.fn_clinical_notes_updated_at();

COMMIT;