-- ==========================================================================
-- Agencia PSI — Migracao: Retroativa WhatsApp-linked v2
-- ==========================================================================
-- Criado por: Leonardo Nohama
-- Data: 2026-04-21 · Sao Carlos/SP — Brasil
--
-- Complementa a migration 20260421000009_retroactive_whatsapp_link:
--
-- Pacientes vinculados via drawer antes do refactor ficaram sem a info
-- de "vinculado WhatsApp". Algumas pecularidades:
--
-- 1. Mensagens podem ser outbound (to_number) ou inbound (from_number)
-- 2. O numero da conversa pode NAO existir ainda em contact_phones
--    (paciente tinha outro telefone cadastrado, CRM WhatsApp linkou um numero diferente)
--
-- Estrategia:
--   - Pra cada paciente com conversa no channel 'whatsapp', coleta TODOS
--     os numeros unicos (from_number + to_number conforme direction)
--   - Pra cada numero:
--       - Se paciente JA tem um contact_phone com esse numero → update pra WhatsApp + linked
--       - Se NAO tem → insere novo com type='whatsapp' + linked
-- ==========================================================================

DO $$
DECLARE
    v_whatsapp_type_id UUID;
BEGIN
    SELECT id INTO v_whatsapp_type_id
        FROM public.contact_types
        WHERE slug = 'whatsapp' AND tenant_id IS NULL
        LIMIT 1;

    IF v_whatsapp_type_id IS NULL THEN
        RAISE NOTICE 'Contact type WhatsApp nao encontrado';
        RETURN;
    END IF;

    -- CTE: extrai (patient_id, phone_digits, first_msg_at) de conversation_messages
    WITH convs AS (
        SELECT
            cm.tenant_id,
            cm.patient_id,
            CASE
                WHEN cm.direction = 'inbound'  THEN regexp_replace(cm.from_number, '\D', '', 'g')
                WHEN cm.direction = 'outbound' THEN regexp_replace(cm.to_number,   '\D', '', 'g')
            END AS phone_digits,
            MIN(COALESCE(cm.received_at, cm.responded_at, cm.created_at)) AS first_msg_at
        FROM public.conversation_messages cm
        WHERE cm.patient_id IS NOT NULL
          AND cm.channel = 'whatsapp'
          AND (cm.from_number IS NOT NULL OR cm.to_number IS NOT NULL)
        GROUP BY cm.tenant_id, cm.patient_id, 3
        HAVING CASE
            WHEN cm.direction = 'inbound'  THEN regexp_replace(cm.from_number, '\D', '', 'g')
            WHEN cm.direction = 'outbound' THEN regexp_replace(cm.to_number,   '\D', '', 'g')
        END IS NOT NULL
    ),
    -- Atualiza phones que ja existem
    updated AS (
        UPDATE public.contact_phones cp
        SET
            contact_type_id = v_whatsapp_type_id,
            whatsapp_linked_at = COALESCE(cp.whatsapp_linked_at, convs.first_msg_at)
        FROM convs
        WHERE cp.entity_type = 'patient'
          AND cp.entity_id = convs.patient_id
          AND cp.number = convs.phone_digits
        RETURNING cp.entity_id, cp.number
    )
    -- Insere phones que nao existem ainda pro paciente
    INSERT INTO public.contact_phones (tenant_id, entity_type, entity_id, contact_type_id, number, is_primary, whatsapp_linked_at, position)
    SELECT
        convs.tenant_id,
        'patient',
        convs.patient_id,
        v_whatsapp_type_id,
        convs.phone_digits,
        false,  -- nao e primary (paciente ja tem outro)
        convs.first_msg_at,
        100  -- final da lista
    FROM convs
    WHERE NOT EXISTS (
        SELECT 1 FROM public.contact_phones cp
        WHERE cp.entity_type = 'patient'
          AND cp.entity_id = convs.patient_id
          AND cp.number = convs.phone_digits
    )
    AND length(convs.phone_digits) BETWEEN 8 AND 15;

    RAISE NOTICE 'Retroactive WhatsApp link v2 complete';
END $$;

-- ==========================================================================
-- FIM DA MIGRACAO
-- ==========================================================================