const LOCALE_CODE_PATTERN = /^[a-z]{2,3}(-[A-Z]{2})?$/;
/**
 * Validates i18n config at plugin initialization.
 * Throws descriptive errors — fail fast, no silent defaults.
 */ export function validateI18nConfig(config) {
    const { defaultLocale, locales } = config;
    if (!locales?.length) {
        throw new Error('[ipal] i18n: "locales" must contain at least one locale.');
    }
    const codes = new Set();
    for (const locale of locales){
        if (!locale.code || !locale.label) {
            throw new Error(`[ipal] i18n: Every locale must have "code" and "label". Received: ${JSON.stringify(locale)}`);
        }
        if (!LOCALE_CODE_PATTERN.test(locale.code)) {
            throw new Error(`[ipal] i18n: Invalid locale code "${locale.code}". Expected format: "pl", "en", "pt-BR".`);
        }
        if (codes.has(locale.code)) {
            throw new Error(`[ipal] i18n: Duplicate locale code "${locale.code}".`);
        }
        codes.add(locale.code);
    }
    if (!codes.has(defaultLocale)) {
        throw new Error(`[ipal] i18n: defaultLocale "${defaultLocale}" not found in locales [${[
            ...codes
        ].join(', ')}].`);
    }
}

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