<?php

namespace Ramsey\Collection\Map;

use Ramsey\Collection\ArrayInterface;

/**
 * An object that maps keys to values.
 *
 * A map cannot contain duplicate keys; each key can map to at most one value.
 *
 * @template K of array-key
 * @template T
 * @extends ArrayInterface<T>
 */
interface MapInterface extends ArrayInterface
{
    /**
     * Returns `true` if this map contains a mapping for the specified key.
     *
     * @param int|string $key The key to check in the map.
     */
    public function containsKey($key);

    /**
     * Returns `true` if this map maps one or more keys to the specified value.
     *
     * This performs a strict type check on the value.
     *
     * @param mixed $value The value to check in the map.
     */
    public function containsValue($value);

    /**
     * Return an array of the keys contained in this map.
     *
     * @return list<K>
     */
    public function keys();

    /**
     * Returns the value to which the specified key is mapped, `null` if this
     * map contains no mapping for the key, or (optionally) `$defaultValue` if
     * this map contains no mapping for the key.
     *
     * @param int|string $key The key to return from the map.
     * @param mixed $defaultValue The default value to use if `$key` is not found.
     *
     * @return T | null the value or `null` if the key could not be found.
     */
    public function get($key, $defaultValue = null);

    /**
     * Associates the specified value with the specified key in this map.
     *
     * If the map previously contained a mapping for the key, the old value is
     * replaced by the specified value.
     *
     * @param int|string $key The key to put or replace in the map.
     * @param mixed $value The value to store at `$key`.
     *
     * @return T | null the previous value associated with key, or `null` if
     *     there was no mapping for `$key`.
     */
    public function put($key, $value);

    /**
     * Associates the specified value with the specified key in this map only if
     * it is not already set.
     *
     * If there is already a value associated with `$key`, this returns that
     * value without replacing it.
     *
     * @param int|string $key The key to put in the map.
     * @param mixed $value The value to store at `$key`.
     *
     * @return T | null the previous value associated with key, or `null` if
     *     there was no mapping for `$key`.
     */
    public function putIfAbsent($key, $value);

    /**
     * Removes the mapping for a key from this map if it is present.
     *
     * @param int|string $key The key to remove from the map.
     *
     * @return T | null the previous value associated with key, or `null` if
     *     there was no mapping for `$key`.
     */
    public function remove($key);

    /**
     * Removes the entry for the specified key only if it is currently mapped to
     * the specified value.
     *
     * This performs a strict type check on the value.
     *
     * @param int|string $key The key to remove from the map.
     * @param mixed $value The value to match.
     *
     * @return bool true if the value was removed.
     */
    public function removeIf($key, $value);

    /**
     * Replaces the entry for the specified key only if it is currently mapped
     * to some value.
     *
     * @param int|string $key The key to replace.
     * @param mixed $value The value to set at `$key`.
     *
     * @return T | null the previous value associated with key, or `null` if
     *     there was no mapping for `$key`.
     */
    public function replace($key, $value);

    /**
     * Replaces the entry for the specified key only if currently mapped to the
     * specified value.
     *
     * This performs a strict type check on the value.
     *
     * @param int|string $key The key to remove from the map.
     * @param mixed $oldValue The value to match.
     * @param mixed $newValue The value to use as a replacement.
     *
     * @return bool true if the value was replaced.
     */
    public function replaceIf($key, $oldValue, $newValue);
}
