var baseCallback = require('../internal/baseCallback'),
    baseEach = require('../internal/baseEach'),
    baseFind = require('../internal/baseFind'),
    findIndex = require('../array/findIndex'),
    isArray = require('../lang/isArray');

/**
 * Iterates over elements of `collection`, returning the first element
 * `predicate` returns truthy for. The predicate is bound to `thisArg` and
 * invoked with three arguments; (value, index|key, collection).
 *
 * If a property name is provided for `predicate` the created "_.property"
 * style callback returns the property value of the given element.
 *
 * If value is also provided for `thisArg` the created "_.matchesProperty"
 * style callback returns `true` for elements that have a matching property
 * value, else `false`.
 *
 * If an object is provided for `predicate` the created "_.matches" style
 * callback returns `true` for elements that have the properties of the given
 * object, else `false`.
 *
 * @static
 * @memberOf _
 * @alias detect
 * @category Collection
 * @param {Array|Object|string} collection The collection to search.
 * @param {Function|Object|string} [predicate=_.identity] The function invoked
 *  per iteration. If a property name or object is provided it is used to
 *  create a "_.property" or "_.matches" style callback respectively.
 * @param {*} [thisArg] The `this` binding of `predicate`.
 * @returns {*} Returns the matched element, else `undefined`.
 * @example
 *
 * var users = [
 *   { 'user': 'barney',  'age': 36, 'active': true },
 *   { 'user': 'fred',    'age': 40, 'active': false },
 *   { 'user': 'pebbles', 'age': 1,  'active': true }
 * ];
 *
 * _.result(_.find(users, function(chr) { return chr.age < 40; }), 'user');
 * // => 'barney'
 *
 * // using the "_.matches" callback shorthand
 * _.result(_.find(users, { 'age': 1, 'active': true }), 'user');
 * // => 'pebbles'
 *
 * // using the "_.matchesProperty" callback shorthand
 * _.result(_.find(users, 'active', false), 'user');
 * // => 'fred'
 *
 * // using the "_.property" callback shorthand
 * _.result(_.find(users, 'active'), 'user');
 * // => 'barney'
 */
function find(collection, predicate, thisArg) {
  if (isArray(collection)) {
    var index = findIndex(collection, predicate, thisArg);
    return index > -1 ? collection[index] : undefined;
  }
  predicate = baseCallback(predicate, thisArg, 3);
  return baseFind(collection, predicate, baseEach);
}

module.exports = find;
