HORIZON PROJECT

var LazyWrapper = require('./_LazyWrapper'),

    LodashWrapper = require('./_LodashWrapper'),

    baseLodash = require('./_baseLodash'),

    isArray = require('./isArray'),

    isObjectLike = require('./isObjectLike'),

    wrapperClone = require('./_wrapperClone');

/** Used for built-in method references. */

var objectProto = Object.prototype;

/** Used to check objects for own properties. */

var hasOwnProperty = objectProto.hasOwnProperty;

/**

 * Creates a `lodash` object which wraps `value` to enable implicit method

 * chain sequences. Methods that operate on and return arrays, collections,

 * and functions can be chained together. Methods that retrieve a single value

 * or may return a primitive value will automatically end the chain sequence

 * and return the unwrapped value. Otherwise, the value must be unwrapped

 * with `_#value`.

 *

 * Explicit chain sequences, which must be unwrapped with `_#value`, may be

 * enabled using `_.chain`.

 *

 * The execution of chained methods is lazy, that is, it's deferred until

 * `_#value` is implicitly or explicitly called.

 *

 * Lazy evaluation allows several methods to support shortcut fusion.

 * Shortcut fusion is an optimization to merge iteratee calls; this avoids

 * the creation of intermediate arrays and can greatly reduce the number of

 * iteratee executions. Sections of a chain sequence qualify for shortcut

 * fusion if the section is applied to an array and iteratees accept only

 * one argument. The heuristic for whether a section qualifies for shortcut

 * fusion is subject to change.

 *

 * Chaining is supported in custom builds as long as the `_#value` method is

 * directly or indirectly included in the build.

 *

 * In addition to lodash methods, wrappers have `Array` and `String` methods.

 *

 * The wrapper `Array` methods are:

 * `concat`, `join`, `pop`, `push`, `shift`, `sort`, `splice`, and `unshift`

 *

 * The wrapper `String` methods are:

 * `replace` and `split`

 *

 * The wrapper methods that support shortcut fusion are:

 * `at`, `compact`, `drop`, `dropRight`, `dropWhile`, `filter`, `find`,

 * `findLast`, `head`, `initial`, `last`, `map`, `reject`, `reverse`, `slice`,

 * `tail`, `take`, `takeRight`, `takeRightWhile`, `takeWhile`, and `toArray`

 *

 * The chainable wrapper methods are:

 * `after`, `ary`, `assign`, `assignIn`, `assignInWith`, `assignWith`, `at`,

 * `before`, `bind`, `bindAll`, `bindKey`, `castArray`, `chain`, `chunk`,

 * `commit`, `compact`, `concat`, `conforms`, `constant`, `countBy`, `create`,

 * `curry`, `debounce`, `defaults`, `defaultsDeep`, `defer`, `delay`,

 * `difference`, `differenceBy`, `differenceWith`, `drop`, `dropRight`,

 * `dropRightWhile`, `dropWhile`, `extend`, `extendWith`, `fill`, `filter`,

 * `flatMap`, `flatMapDeep`, `flatMapDepth`, `flatten`, `flattenDeep`,

 * `flattenDepth`, `flip`, `flow`, `flowRight`, `fromPairs`, `functions`,

 * `functionsIn`, `groupBy`, `initial`, `intersection`, `intersectionBy`,

 * `intersectionWith`, `invert`, `invertBy`, `invokeMap`, `iteratee`, `keyBy`,

 * `keys`, `keysIn`, `map`, `mapKeys`, `mapValues`, `matches`, `matchesProperty`,

 * `memoize`, `merge`, `mergeWith`, `method`, `methodOf`, `mixin`, `negate`,

 * `nthArg`, `omit`, `omitBy`, `once`, `orderBy`, `over`, `overArgs`,

 * `overEvery`, `overSome`, `partial`, `partialRight`, `partition`, `pick`,

 * `pickBy`, `plant`, `property`, `propertyOf`, `pull`, `pullAll`, `pullAllBy`,

 * `pullAllWith`, `pullAt`, `push`, `range`, `rangeRight`, `rearg`, `reject`,

 * `remove`, `rest`, `reverse`, `sampleSize`, `set`, `setWith`, `shuffle`,

 * `slice`, `sort`, `sortBy`, `splice`, `spread`, `tail`, `take`, `takeRight`,

 * `takeRightWhile`, `takeWhile`, `tap`, `throttle`, `thru`, `toArray`,

 * `toPairs`, `toPairsIn`, `toPath`, `toPlainObject`, `transform`, `unary`,

 * `union`, `unionBy`, `unionWith`, `uniq`, `uniqBy`, `uniqWith`, `unset`,

 * `unshift`, `unzip`, `unzipWith`, `update`, `updateWith`, `values`,

 * `valuesIn`, `without`, `wrap`, `xor`, `xorBy`, `xorWith`, `zip`,

 * `zipObject`, `zipObjectDeep`, and `zipWith`

 *

 * The wrapper methods that are **not** chainable by default are:

 * `add`, `attempt`, `camelCase`, `capitalize`, `ceil`, `clamp`, `clone`,

 * `cloneDeep`, `cloneDeepWith`, `cloneWith`, `conformsTo`, `deburr`,

 * `defaultTo`, `divide`, `each`, `eachRight`, `endsWith`, `eq`, `escape`,

 * `escapeRegExp`, `every`, `find`, `findIndex`, `findKey`, `findLast`,

 * `findLastIndex`, `findLastKey`, `first`, `floor`, `forEach`, `forEachRight`,

 * `forIn`, `forInRight`, `forOwn`, `forOwnRight`, `get`, `gt`, `gte`, `has`,

 * `hasIn`, `head`, `identity`, `includes`, `indexOf`, `inRange`, `invoke`,

 * `isArguments`, `isArray`, `isArrayBuffer`, `isArrayLike`, `isArrayLikeObject`,

 * `isBoolean`, `isBuffer`, `isDate`, `isElement`, `isEmpty`, `isEqual`,

 * `isEqualWith`, `isError`, `isFinite`, `isFunction`, `isInteger`, `isLength`,

 * `isMap`, `isMatch`, `isMatchWith`, `isNaN`, `isNative`, `isNil`, `isNull`,

 * `isNumber`, `isObject`, `isObjectLike`, `isPlainObject`, `isRegExp`,

 * `isSafeInteger`, `isSet`, `isString`, `isUndefined`, `isTypedArray`,

 * `isWeakMap`, `isWeakSet`, `join`, `kebabCase`, `last`, `lastIndexOf`,

 * `lowerCase`, `lowerFirst`, `lt`, `lte`, `max`, `maxBy`, `mean`, `meanBy`,

 * `min`, `minBy`, `multiply`, `noConflict`, `noop`, `now`, `nth`, `pad`,

 * `padEnd`, `padStart`, `parseInt`, `pop`, `random`, `reduce`, `reduceRight`,

 * `repeat`, `result`, `round`, `runInContext`, `sample`, `shift`, `size`,

 * `snakeCase`, `some`, `sortedIndex`, `sortedIndexBy`, `sortedLastIndex`,

 * `sortedLastIndexBy`, `startCase`, `startsWith`, `stubArray`, `stubFalse`,

 * `stubObject`, `stubString`, `stubTrue`, `subtract`, `sum`, `sumBy`,

 * `template`, `times`, `toFinite`, `toInteger`, `toJSON`, `toLength`,

 * `toLower`, `toNumber`, `toSafeInteger`, `toString`, `toUpper`, `trim`,

 * `trimEnd`, `trimStart`, `truncate`, `unescape`, `uniqueId`, `upperCase`,

 * `upperFirst`, `value`, and `words`

 *

 * @name _

 * @constructor

 * @category Seq

 * @param {*} value The value to wrap in a `lodash` instance.

 * @returns {Object} Returns the new `lodash` wrapper instance.

 * @example

 *

 * function square(n) {

 *   return n * n;

 * }

 *

 * var wrapped = _([1, 2, 3]);

 *

 * // Returns an unwrapped value.

 * wrapped.reduce(_.add);

 * // => 6

 *

 * // Returns a wrapped value.

 * var squares = wrapped.map(square);

 *

 * _.isArray(squares);

 * // => false

 *

 * _.isArray(squares.value());

 * // => true

 */

function lodash(value) {

  if (isObjectLike(value) && !isArray(value) && !(value instanceof LazyWrapper)) {

    if (value instanceof LodashWrapper) {

      return value;

    }

    if (hasOwnProperty.call(value, '__wrapped__')) {

      return wrapperClone(value);

    }

  }

  return new LodashWrapper(value);

}

// Ensure wrappers are instances of `baseLodash`.

lodash.prototype = baseLodash.prototype;

lodash.prototype.constructor = lodash;

module.exports = lodash;