package com.baiyue.common.event;

import java.util.Locale;

/** Canonical physical container number used by cross-region business facts. */
public final class ContainerNumbers {
    private static final int[] LETTER_VALUES = {
        10, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 23, 24,
        25, 26, 27, 28, 29, 30, 31, 32, 34, 35, 36, 37, 38
    };

    private ContainerNumbers() { }

    public static String normalizeRequired(String value) {
        if (value == null || value.isBlank()) {
            throw new IllegalArgumentException("containerNo is required");
        }
        StringBuilder compact = new StringBuilder(value.length());
        value.codePoints().filter(codePoint -> !Character.isWhitespace(codePoint)
            && !Character.isSpaceChar(codePoint)).forEach(compact::appendCodePoint);
        String normalized = compact.toString().toUpperCase(Locale.ROOT);
        if (!normalized.matches("[A-Z]{3}[UJZ][0-9]{7}")) {
            throw new IllegalArgumentException("containerNo must comply with ISO 6346");
        }
        int sum = 0;
        for (int index = 0; index < 10; index++) {
            char current = normalized.charAt(index);
            int number = Character.isDigit(current) ? current - '0' : LETTER_VALUES[current - 'A'];
            sum += number * (1 << index);
        }
        if (normalized.charAt(10) - '0' != sum % 11 % 10) {
            throw new IllegalArgumentException("containerNo must comply with ISO 6346 check digit");
        }
        return normalized;
    }

    public static String requireCanonical(String value) {
        String normalized = normalizeRequired(value);
        if (!normalized.equals(value)) {
            throw new IllegalArgumentException("containerNo must be normalized");
        }
        return normalized;
    }
}