import { APIError } from 'payload';
/**
 * Field hook for a System Page role relationship in SiteSettings: ensures a page
 * isn't assigned to two roles at once (e.g. the same page as both homepage and
 * privacyPolicy), which would make routing ambiguous.
 *
 * Attach to each role field's beforeValidate. `siblingFields` are the OTHER role
 * field names to check against.
 *
 *   hooks: { beforeValidate: [buildValidateUniqueRole({
 *     siblingFields: ['privacyPolicy', 'cookiePolicy', 'termsOfService'],
 *   })] }
 */ export function buildValidateUniqueRole(args) {
    return ({ field, siblingData, value })=>{
        if (value == null) {
            return value;
        }
        const thisId = typeof value === 'object' ? value.id : value;
        for (const sibling of args.siblingFields){
            const other = siblingData?.[sibling];
            const otherId = other && typeof other === 'object' ? other.id : other;
            if (otherId != null && String(otherId) === String(thisId)) {
                const name = typeof field === 'object' && 'name' in field ? field.name : 'ta rola';
                throw new APIError(`Ta sama strona jest przypisana do "${name}" i "${sibling}". ` + `Każda rola systemowa musi wskazywać inną stronę.`, 400);
            }
        }
        return value;
    };
}

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