<?php
declare(strict_types=1);

/**
 * CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
 * Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 *
 * Licensed under The MIT License
 * For full copyright and license information, please see the LICENSE.txt
 * Redistributions of files must retain the above copyright notice.
 *
 * @copyright     Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
 * @link          https://cakephp.org CakePHP(tm) Project
 * @since         3.0.0
 * @license       https://opensource.org/licenses/mit-license.php MIT License
 */
namespace Cake\View\Form;

/**
 * Interface for FormHelper context implementations.
 */
interface ContextInterface
{
    /**
     * @var array<string>
     */
    public const VALID_ATTRIBUTES = ['length', 'precision', 'comment', 'null', 'default'];

    /**
     * Get the fields used in the context as a primary key.
     *
     * @return array<string>
     */
    public function getPrimaryKey(): array;

    /**
     * Returns true if the passed field name is part of the primary key for this context
     *
     * @param string $field A dot separated path to the field a value
     *   is needed for.
     * @return bool
     */
    public function isPrimaryKey(string $field): bool;

    /**
     * Returns whether this form is for a create operation.
     *
     * @return bool
     */
    public function isCreate(): bool;

    /**
     * Get the current value for a given field.
     *
     * Classes implementing this method can optionally have a second argument
     * `$options`. Valid key for `$options` array are:
     *
     *   - `default`: Default value to return if no value found in data or
     *     context record.
     *   - `schemaDefault`: Boolean indicating whether default value from
     *     context's schema should be used if it's not explicitly provided.
     *
     * @param string $field A dot separated path to the field a value
     * @param array<string, mixed> $options Options.
     *   is needed for.
     * @return mixed
     */
    public function val(string $field, array $options = []);

    /**
     * Check if a given field is 'required'.
     *
     * In this context class, this is simply defined by the 'required' array.
     *
     * @param string $field A dot separated path to check required-ness for.
     * @return bool|null
     */
    public function isRequired(string $field): ?bool;

    /**
     * Gets the default "required" error message for a field
     *
     * @param string $field A dot separated path to the field name
     * @return string|null
     */
    public function getRequiredMessage(string $field): ?string;

    /**
     * Get maximum length of a field from model validation.
     *
     * @param string $field Field name.
     * @return int|null
     */
    public function getMaxLength(string $field): ?int;

    /**
     * Get the field names of the top level object in this context.
     *
     * @return array<string> A list of the field names in the context.
     */
    public function fieldNames(): array;

    /**
     * Get the abstract field type for a given field name.
     *
     * @param string $field A dot separated path to get a schema type for.
     * @return string|null An abstract data type or null.
     * @see \Cake\Database\TypeFactory
     */
    public function type(string $field): ?string;

    /**
     * Get an associative array of other attributes for a field name.
     *
     * @param string $field A dot separated path to get additional data on.
     * @return array An array of data describing the additional attributes on a field.
     */
    public function attributes(string $field): array;

    /**
     * Check whether a field has an error attached to it
     *
     * @param string $field A dot separated path to check errors on.
     * @return bool Returns true if the errors for the field are not empty.
     */
    public function hasError(string $field): bool;

    /**
     * Get the errors for a given field
     *
     * @param string $field A dot separated path to check errors on.
     * @return array An array of errors, an empty array will be returned when the
     *    context has no errors.
     */
    public function error(string $field): array;
}
