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<?php

namespace Laminas\Validator;

use Laminas\Stdlib\ArrayUtils;
use Traversable;

use function count;
use function is_countable;
use function is_numeric;

/**
 * Validate that a value is countable and the count meets expectations.
 *
 * The validator has five specific behaviors:
 *
 * - You can determine if a value is countable only
 * - You can test if the value is an exact count
 * - You can test if the value is greater than a minimum count value
 * - You can test if the value is greater than a maximum count value
 * - You can test if the value is between the minimum and maximum count values
 *
 * When creating the instance or calling `setOptions()`, if you specify a
 * "count" option, specifying either "min" or "max" leads to an inconsistent
 * state and, as such will raise an Exception\InvalidArgumentException.
 *
 * @psalm-type Options = array{
 *     count: int|null,
 *     min: int|null,
 *     max: int|null,
 * }
 * @psalm-type OptionsArgument = array{
 *     count?: int|null,
 *     min?: int|null,
 *     max?: int|null,
 * }&array<string, mixed>
 * @property Options&array<string, mixed> $options Required to stop Psalm getting confused about the declaration
 *                                                 on AbstractValidator
 * @final
 */
class IsCountable extends AbstractValidator
{
    public const NOT_COUNTABLE = 'notCountable';
    public const NOT_EQUALS    = 'notEquals';
    public const GREATER_THAN  = 'greaterThan';
    public const LESS_THAN     = 'lessThan';

    /**
     * Validation failure message template definitions
     *
     * @var array<string, string>
     */
    protected $messageTemplates = [
        self::NOT_COUNTABLE => 'The input must be an array or an instance of \\Countable',
        self::NOT_EQUALS    => "The input count must equal '%count%'",
        self::GREATER_THAN  => "The input count must be less than '%max%', inclusively",
        self::LESS_THAN     => "The input count must be greater than '%min%', inclusively",
    ];

    /**
     * Additional variables available for validation failure messages
     *
     * @var array<string, array{options: string}>
     */
    protected $messageVariables = [
        'count' => ['options' => 'count'],
        'min'   => ['options' => 'min'],
        'max'   => ['options' => 'max'],
    ];

    /** @psalm-var Options */
    protected $options = [
        'count' => null,
        'min'   => null,
        'max'   => null,
    ];

    /**
     * @param OptionsArgument|iterable<string, mixed> $options
     * @return $this Provides fluid interface
     */
    public function setOptions($options = [])
    {
        if ($options instanceof Traversable) {
            $options = ArrayUtils::iteratorToArray($options);
        }

        /** @psalm-var Options $options */

        if (isset($options['count'])) {
            $this->setCount($options['count']);
        }

        if (isset($options['min'])) {
            $this->setMin($options['min']);
        }

        if (isset($options['max'])) {
            $this->setMax($options['max']);
        }

        unset($options['count'], $options['min'], $options['max']);

        parent::setOptions($options);

        return $this;
    }

    /**
     * Returns true if and only if $value is countable (and the count validates against optional values).
     *
     * @param mixed $value
     * @return bool
     */
    public function isValid($value)
    {
        if (! is_countable($value)) {
            $this->error(self::NOT_COUNTABLE);
            return false;
        }

        $count = count($value);

        if (is_numeric($this->getCount())) {
            if ($count !== $this->getCount()) {
                $this->error(self::NOT_EQUALS);
                return false;
            }

            return true;
        }

        if (is_numeric($this->getMax()) && $count > $this->getMax()) {
            $this->error(self::GREATER_THAN);
            return false;
        }

        if (is_numeric($this->getMin()) && $count < $this->getMin()) {
            $this->error(self::LESS_THAN);
            return false;
        }

        return true;
    }

    /**
     * Returns the count option
     *
     * @deprecated Since 2.61.0 All option getters and setters will be removed in 3.0
     *
     * @return int|null
     */
    public function getCount()
    {
        return $this->options['count'];
    }

    /**
     * Returns the min option
     *
     * @deprecated Since 2.61.0 All option getters and setters will be removed in 3.0
     *
     * @return int|null
     */
    public function getMin()
    {
        return $this->options['min'];
    }

    /**
     * Returns the max option
     *
     * @deprecated Since 2.61.0 All option getters and setters will be removed in 3.0
     *
     * @return int|null
     */
    public function getMax()
    {
        return $this->options['max'];
    }

    /**
     * @throws Exception\InvalidArgumentException If either a min or max option
     *     was previously set.
     */
    private function setCount(int $value): void
    {
        if (isset($this->options['min']) || isset($this->options['max'])) {
            throw new Exception\InvalidArgumentException(
                'Cannot set count; conflicts with either a min or max option previously set'
            );
        }
        $this->options['count'] = $value;
    }

    /**
     * @throws Exception\InvalidArgumentException If either a count or max option
     *     was previously set.
     */
    private function setMin(int $value): void
    {
        if (isset($this->options['count'])) {
            throw new Exception\InvalidArgumentException(
                'Cannot set count; conflicts with either a count option previously set'
            );
        }
        $this->options['min'] = $value;
    }

    /**
     * @throws Exception\InvalidArgumentException If either a count or min option
     *     was previously set.
     */
    private function setMax(int $value): void
    {
        if (isset($this->options['count'])) {
            throw new Exception\InvalidArgumentException(
                'Cannot set count; conflicts with either a count option previously set'
            );
        }
        $this->options['max'] = $value;
    }
}