-- 1️⃣ Créer la table d’audit
CREATE TABLE audit.piece_audit_log (
                                       audit_id SERIAL PRIMARY KEY,
                                       piece_id BIGINT,
                                       action VARCHAR(10),
                                       changed_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP,
                                       old_data JSONB,
                                       new_data JSONB
);

-- 2️⃣ Créer la fonction d’audit
CREATE OR REPLACE FUNCTION audit.audit_piece_changes()
    RETURNS TRIGGER AS $$
BEGIN
    IF (TG_OP = 'UPDATE') THEN
        INSERT INTO audit.piece_audit_log (piece_id, action, old_data, new_data)
        VALUES (
                   OLD.id,
                   TG_OP,
                   to_jsonb(OLD),
                   to_jsonb(NEW)
               );
        RETURN NEW;
    ELSIF (TG_OP = 'INSERT') THEN
        INSERT INTO audit.piece_audit_log (piece_id, action, new_data)
        VALUES (
                   NEW.id,
                   TG_OP,
                   to_jsonb(NEW)
               );
        RETURN NEW;
    ELSIF (TG_OP = 'DELETE') THEN
        INSERT INTO audit.piece_audit_log (piece_id, action, old_data)
        VALUES (
                   OLD.id,
                   TG_OP,
                   to_jsonb(OLD)
               );
        RETURN OLD;
    END IF;
END;
$$ LANGUAGE plpgsql;

-- 3️⃣ Créer le trigger
CREATE TRIGGER trigger_audit_piece
    AFTER INSERT OR UPDATE OR DELETE ON piece
    FOR EACH ROW
EXECUTE FUNCTION audit.audit_piece_changes();


GRANT USAGE ON SCHEMA audit TO infocad_user;
GRANT INSERT, SELECT ON audit.piece_audit_log TO infocad_user;