import isPlainObject from 'lodash.isplainobject';

function forEachObject(obj, fn, path) {
    for (const key in obj) {
        const deepPath = path ? `${path}.${key}` : key;

        // Note that we always use obj[key] because it might be mutated by forEach
        fn.call(obj, obj[key], key, obj, deepPath);

        forEach(obj[key], fn, deepPath);
    }
}

function forEachArray(array, fn, path) {
    array.forEach((value, index, arr) => {
        const deepPath = `${path}[${index}]`;

        fn.call(arr, value, index, arr, deepPath);

        // Note that we use arr[index] because it might be mutated by forEach
        forEach(arr[index], fn, deepPath);
    });
}

function forEach(value, fn, path) {
    path = path || '';

    if (Array.isArray(value)) {
        forEachArray(value, fn, path);
    } else if (isPlainObject(value)) {
        forEachObject(value, fn, path);
    }
}

export default forEach;
