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<?php
/*
 * Copyright 2017 Jack Sleight <http://jacksleight.com/>
 * This source file is subject to the MIT license that is bundled with this package in the file LICENCE. 
 */

namespace Coast\Validator;
use JsonSerializable;

abstract class Rule implements JsonSerializable
{
    protected $_name;

    protected $_errors = [];

    public function __construct()
    {}

    public function name($name = null)
    {
        if (func_num_args() > 0) {
            $this->_name = $name;
            return $this;
        }
        if (isset($this->_name)) {
            return $this->_name;
        }
        $parts = explode('\\', get_class($this));
        return lcfirst(array_pop($parts));
    }

    public function params()
    {
        $params = [];
        foreach (get_object_vars($this) as $key => $value) {
            if (in_array($key, ['_name', '_errors'])) {
                continue;
            }
            $params[ltrim($key, '_')] = $value;
        }
        return $params;
    }

    abstract protected function _validate($value);

    public function validate($value, $context = null)
    {
        $this->_errors = [];
        $this->_validate($value, $context);
        return !count($this->_errors);
    }

    public function isValid()
    {
        return !count($this->_errors);
    }

    public function __invoke($value, $context = null)
    {
        return $this->validate($value, $context);
    }

    public function error($error = null)
    {
        if (!is_array($error)) {
            $error = [$this->name(), $error, $this->params()];
        }
        $this->_errors[] = $error;
        return $this;
    }

    public function errors(array $errors = null)
    {
        if (func_num_args() > 0) {
            foreach ($errors as $error) {
                $this->error($error);
                return $this;
            }
        }
        return $this->_errors;
    }

    public function jsonSerialize()
    {
        return [
            'name'      => $this->name(),
            'params'    => $this->params(),
        ];
    }
}