-- prc_quote: customer_code required + included in unique business key
-- Idempotent; safe after quote_customer_code_alter.sql
SET NAMES utf8mb4;
SET @db := DATABASE();

-- Ensure column exists
SET @has := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_quote' AND COLUMN_NAME = 'customer_code'
);
SET @sql := IF(@has = 0,
  'ALTER TABLE prc_quote ADD COLUMN customer_code VARCHAR(50) DEFAULT NULL COMMENT ''customer code'' AFTER customer_id',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- Backfill from bms_customer
UPDATE prc_quote q
INNER JOIN bms_customer c ON c.customer_id = q.customer_id
SET q.customer_code = c.customer_code
WHERE q.customer_id IS NOT NULL
  AND q.customer_id <> 0
  AND (q.customer_code IS NULL OR q.customer_code = '');

-- Remove rows that still have no customer_code (cannot join unique NOT NULL)
DELETE FROM prc_quote WHERE customer_code IS NULL OR customer_code = '';

-- NOT NULL
ALTER TABLE prc_quote
  MODIFY COLUMN customer_code VARCHAR(50) NOT NULL COMMENT 'customer code';

-- Drop old non-unique index if present
SET @hasIdx := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_quote' AND INDEX_NAME = 'idx_quote_customer_code'
);
SET @sql := IF(@hasIdx > 0,
  'ALTER TABLE prc_quote DROP INDEX idx_quote_customer_code',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- Normalized postcode for unique (NULL -> '')
SET @hasGen := (
  SELECT COUNT(*) FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_quote' AND COLUMN_NAME = 'quote_postcode_key'
);
SET @sql := IF(@hasGen = 0,
  'ALTER TABLE prc_quote ADD COLUMN quote_postcode_key VARCHAR(20) AS (IFNULL(dest_postcode, '''')) STORED COMMENT ''dest_postcode for unique key'' AFTER dest_postcode',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;

-- Unique: customer_code + product + country + postcode + weight + biz_date
SET @hasUk := (
  SELECT COUNT(*) FROM information_schema.STATISTICS
  WHERE TABLE_SCHEMA = @db AND TABLE_NAME = 'prc_quote' AND INDEX_NAME = 'uk_quote_cust_biz'
);
SET @sql := IF(@hasUk = 0,
  'ALTER TABLE prc_quote ADD UNIQUE KEY uk_quote_cust_biz (customer_code, product_code, country_code, quote_postcode_key, weight, biz_date)',
  'SELECT 1');
PREPARE stmt FROM @sql; EXECUTE stmt; DEALLOCATE PREPARE stmt;