<?php
namespace nur\sery\wip\php\access;

use ArrayAccess;
use nulib\cl;

/**
 * Class KeyAccess: accès à une valeur d'une clé dans un tableau
 */
class KeyAccess extends AbstractAccess {
  function __construct(&$array, $key, ?array $params=null) {
    parent::__construct($params);
    $this->array =& $array;
    $this->key = $key;
    $this->allowNull = $params["allow_null"] ?? true;
    $this->allowFalse = $params["allow_false"] ?? false;
  }

  /** @var array|ArrayAccess */
  protected $array;

  /** @var int|string|array */
  protected $key;

  protected bool $allowNull;

  protected bool $allowFalse;

  function reset(&$array): self {
    $this->array =& $array;
    return $this;
  }

  function exists(): bool {
    $key = $this->key;
    if ($key === null) return false;
    return cl::phas($this->array, $key);
  }

  function available(): bool {
    if (!$this->exists()) return false;
    $value = cl::pget($this->array, $this->key);
    if ($value === "") return $this->allowEmpty;
    if ($value === null) return $this->allowNull;
    if ($value === false) return $this->allowFalse;
    return true;
  }

  function get($default=null) {
    if ($this->key === null) return $default;
    $value = cl::pget($this->array, $this->key, $default);
    if ($value === "" && !$this->allowEmpty) return $default;
    if ($value === null && !$this->allowNull) return $default;
    if ($value === false && !$this->allowFalse) return $default;
    return $value;
  }

  function set($value): void {
    if ($this->key === null) return;
    cl::pset($this->array, $this->key, $value);
  }

  function del(): void {
    if ($this->key === null) return;
    cl::pdel($this->array, $this->key);
  }

  function addKey($key): self {
    return new KeyAccess($this->array, cl::merge($this->key, $key), [
      "allow_empty" => $this->allowEmpty,
      "allow_null" => $this->allowNull,
      "allow_false" => $this->allowFalse,
    ]);
  }
}