-- Normaliza snapshots documentales en `proformas` e `issued_invoices`.
-- Fases:
--   1. DDL conservadora.
--   2. Backfill de snapshots.
--   3. Diagnostico/validacion.
--   4. Endurecimiento opcional cuando no queden nulos.

ALTER TABLE proformas
  ADD COLUMN IF NOT EXISTS proforma_series_code VARCHAR(10) NULL AFTER document_series_id;

ALTER TABLE issued_invoices
  ADD COLUMN IF NOT EXISTS document_series_id CHAR(36) NULL AFTER source_proforma_id,
  ADD COLUMN IF NOT EXISTS invoice_reference VARCHAR(64) NULL AFTER invoice_number;

UPDATE proformas p
JOIN document_series ds ON ds.id = p.document_series_id
SET p.proforma_series_code = ds.code
WHERE p.proforma_series_code IS NULL;

SELECT id, document_series_id, proforma_series_code, proforma_number, proforma_reference
FROM proformas
WHERE proforma_series_code IS NULL;

SELECT
  ds.company_id,
  ds.document_type,
  ds.code,
  COUNT(*) AS series_count
FROM document_series ds
WHERE ds.document_type = 'issued_invoice'
GROUP BY ds.company_id, ds.document_type, ds.code
HAVING COUNT(*) > 1;

UPDATE issued_invoices ii
JOIN document_series ds
  ON ds.company_id = ii.company_id
 AND ds.document_type = 'issued_invoice'
 AND ds.code = ii.invoice_series_code
SET ii.document_series_id = ds.id
WHERE ii.document_series_id IS NULL;

SELECT id, invoice_series_code, invoice_number
FROM issued_invoices
ORDER BY created_at DESC
LIMIT 20;

UPDATE issued_invoices ii
JOIN document_series ds ON ds.id = ii.document_series_id
SET ii.invoice_reference = CONCAT(
  COALESCE(ds.prefix, ''),
  LPAD(CAST(ii.invoice_number AS UNSIGNED), ds.padding, '0'),
  COALESCE(ds.suffix, '')
)
WHERE ii.invoice_reference IS NULL;

SELECT id, source_proforma_id, document_series_id, invoice_series_code, invoice_number, invoice_reference
FROM issued_invoices
WHERE document_series_id IS NULL
   OR invoice_reference IS NULL;

SELECT company_id, proforma_series_code, proforma_number, COUNT(*) AS c
FROM proformas
WHERE deleted_at IS NULL
GROUP BY company_id, proforma_series_code, proforma_number
HAVING c > 1;

SELECT company_id, invoice_series_code, invoice_number, COUNT(*) AS c
FROM issued_invoices
WHERE deleted_at IS NULL
GROUP BY company_id, invoice_series_code, invoice_number
HAVING c > 1;

CREATE INDEX idx_proformas_document_series_id
ON proformas (document_series_id);

CREATE INDEX idx_issued_invoices_document_series_id
ON issued_invoices (document_series_id);

-- Ejecutar solo cuando las validaciones anteriores devuelvan 0 filas pendientes.
-- ALTER TABLE proformas
--   MODIFY proforma_series_code VARCHAR(10) NOT NULL;
--
-- ALTER TABLE issued_invoices
--   MODIFY document_series_id CHAR(36) NOT NULL,
--   MODIFY invoice_reference VARCHAR(64) NOT NULL;