import { nat } from './nat.js';
import { indexToMappedConstantMapperFor, indexToMappedConstantUnmapperFor, } from './_internals/mappers/IndexToMappedConstant.js';
import { Error } from '../utils/globals.js';
function computeNumChoices(options) {
if (options.length === 0)
throw new Error(`fc.mapToConstant expects at least one option`);
let numChoices = 0;
for (let idx = 0; idx !== options.length; ++idx) {
if (options[idx].num < 0)
throw new Error(`fc.mapToConstant expects all options to have a number of entries greater or equal to zero`);
numChoices += options[idx].num;
}
if (numChoices === 0)
throw new Error(`fc.mapToConstant expects at least one choice among options`);
return numChoices;
}
export function mapToConstant(...entries) {
const numChoices = computeNumChoices(entries);
return nat({ max: numChoices - 1 }).map(indexToMappedConstantMapperFor(entries), indexToMappedConstantUnmapperFor(entries));
}