import assignValue from "./_assignValue";
import castPath from "./_castPath";
import isIndex from "./_isIndex";
import toKey from "./_toKey";
import isObject from "../#isObject";

/**
 * The base implementation of `set`.
 *
 * @private
 * @param {Object} object The object to modify.
 * @param {Array|string} path The path of the property to set.
 * @param {*} value The value to set.
 * @param {Function} [customizer] The function to customize path creation.
 * @returns {Object} Returns `object`.
 */
function baseSet<T extends object>(object: T, path: PropertyPath, value: any, customizer?: (value: any, key: string, nested: any) => any): T {
    if (!isObject(object)) {
        return object;
    }
    const partial = castPath(path, object);

    const length = partial.length;
    const lastIndex = length - 1;

    let index = -1;
    let nested = object as any;

    while (nested != null && ++index < length) {
        const key = toKey(partial[index]);
        let newValue = value;

        if (index != lastIndex) {
            const value = nested[key];
            newValue = customizer ? customizer(value, key, nested) : undefined;
            if (newValue === undefined) {
                if (isObject(value)) {
                    newValue = value;
                } else {
                    newValue = isIndex(partial[index + 1]) ? [] : {};
                }
            }
        }
        assignValue(nested, key, newValue);
        nested = nested[key];
    }
    return object;
}

export default baseSet;
// import assignValue from "./assignValue.js";
// import castPath from "./castPath.js";
// import isIndex from "./isIndex.js";
// import isObject from "../isObject.js";
// import toKey from "./toKey.js";

// /**
//  * The base implementation of `set`.
//  *
//  * @private
//  * @param {Object} object The object to modify.
//  * @param {Array|string} path The path of the property to set.
//  * @param {*} value The value to set.
//  * @param {Function} [customizer] The function to customize path creation.
//  * @returns {Object} Returns `object`.
//  */
// function baseSet(object, path, value, customizer) {
//     if (!isObject(object)) {
//         return object;
//     }
//     path = castPath(path, object);

//     const length = path.length;
//     const lastIndex = length - 1;

//     let index = -1;
//     let nested = object;

//     while (nested != null && ++index < length) {
//         const key = toKey(path[index]);
//         let newValue = value;

//         if (index != lastIndex) {
//             const objValue = nested[key];
//             newValue = customizer ? customizer(objValue, key, nested) : undefined;
//             if (newValue === undefined) {
//                 newValue = isObject(objValue) ? objValue : isIndex(path[index + 1]) ? [] : {};
//             }
//         }
//         assignValue(nested, key, newValue);
//         nested = nested[key];
//     }
//     return object;
// }

// export default baseSet;