-- ============================================================================
-- Migration 035 - Migrazione dati supplier_questionnaires (027) -> campaigns
-- ----------------------------------------------------------------------------
-- PROPOSTA DI DESIGN (NON ancora applicata). Da eseguire PER ULTIMA su host MySQL.
--
-- Travasa le righe di supplier_questionnaires (mig 027) in
-- questionnaire_campaigns (mig 032), preservando i token sq_ gia inviati:
--   token_hash (027)  -> access_token_hash (032)  [stesso SHA-256]
--   status     (027: sent|completed|expired) -> status (032 ENUM esteso)
--   answers/score/risk_level/email/date       -> mappatura 1:1
--
-- Idempotente: INSERT ... SELECT con anti-join su access_token_hash (UNIQUE),
-- quindi rilanciabile senza duplicare. template_id resta NULL (legacy).
-- 027 NON viene droppata: resta read-only/deprecata per audit storico.
--
-- DIPENDE da: 032 (questionnaire_campaigns deve esistere) e 027.
--   mysql -h localhost nis2_agile_db -e "source docs/sql/035_migrate_027_to_campaigns.sql"
--
-- Ordine globale: 032 -> 033 -> 034 -> 035.
-- ============================================================================

DELIMITER //
DROP PROCEDURE IF EXISTS _mig035 //
CREATE PROCEDURE _mig035()
BEGIN
    IF EXISTS (SELECT 1 FROM information_schema.TABLES
               WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='supplier_questionnaires')
       AND EXISTS (SELECT 1 FROM information_schema.TABLES
               WHERE TABLE_SCHEMA=DATABASE() AND TABLE_NAME='questionnaire_campaigns')
    THEN
        INSERT INTO questionnaire_campaigns
            (organization_id, supplier_id, template_id, template_version,
             access_token_hash, status, score, risk_level, answers,
             sent_to_email, sent_at, completed_at, expires_at, created_at)
        SELECT
            sq.organization_id,
            sq.supplier_id,
            NULL                                   AS template_id,
            NULL                                   AS template_version,
            sq.token_hash                          AS access_token_hash,
            CASE sq.status
                WHEN 'sent'      THEN 'sent'
                WHEN 'completed' THEN 'completed'
                WHEN 'expired'   THEN 'expired'
                ELSE 'sent'
            END                                    AS status,
            sq.score,
            sq.risk_level,
            sq.answers,
            sq.sent_to_email,
            sq.sent_at,
            sq.completed_at,
            sq.expires_at,
            sq.created_at
        FROM supplier_questionnaires sq
        LEFT JOIN questionnaire_campaigns qc
               ON qc.access_token_hash = sq.token_hash
        WHERE qc.id IS NULL;   -- anti-join: salta quelle gia migrate (idempotenza)
    END IF;
END //
DELIMITER ;
CALL _mig035();
DROP PROCEDURE IF EXISTS _mig035;

-- ROLLBACK (manuale): cancella SOLO le campagne legacy importate (template_id NULL,
-- token corrispondente in supplier_questionnaires). NON tocca le campagne native.
-- DELETE qc FROM questionnaire_campaigns qc
--   JOIN supplier_questionnaires sq ON sq.token_hash = qc.access_token_hash
--   WHERE qc.template_id IS NULL;