class CollectionConstraint

class CollectionConstraint extends Constraint {
    
    /**
     * {@inheritdoc}
     */
    public function check(&$value, $schema = null, ?JsonPointer $path = null, $i = null) {
        // Verify minItems
        if (isset($schema->minItems) && count($value) < $schema->minItems) {
            $this->addError($path, 'There must be a minimum of ' . $schema->minItems . ' items in the array', 'minItems', array(
                'minItems' => $schema->minItems,
            ));
        }
        // Verify maxItems
        if (isset($schema->maxItems) && count($value) > $schema->maxItems) {
            $this->addError($path, 'There must be a maximum of ' . $schema->maxItems . ' items in the array', 'maxItems', array(
                'maxItems' => $schema->maxItems,
            ));
        }
        // Verify uniqueItems
        if (isset($schema->uniqueItems) && $schema->uniqueItems) {
            $unique = $value;
            if (is_array($value) && count($value)) {
                $unique = array_map(function ($e) {
                    return var_export($e, true);
                }, $value);
            }
            if (count(array_unique($unique)) != count($value)) {
                $this->addError($path, 'There are no duplicates allowed in the array', 'uniqueItems');
            }
        }
        // Verify items
        if (isset($schema->items)) {
            $this->validateItems($value, $schema, $path, $i);
        }
    }
    
    /**
     * Validates the items
     *
     * @param array            $value
     * @param \stdClass        $schema
     * @param JsonPointer|null $path
     * @param string           $i
     */
    protected function validateItems(&$value, $schema = null, ?JsonPointer $path = null, $i = null) {
        if (is_object($schema->items)) {
            // just one type definition for the whole array
            foreach ($value as $k => &$v) {
                $initErrors = $this->getErrors();
                // First check if its defined in "items"
                $this->checkUndefined($v, $schema->items, $path, $k);
                // Recheck with "additionalItems" if the first test fails
                if (count($initErrors) < count($this->getErrors()) && (isset($schema->additionalItems) && $schema->additionalItems !== false)) {
                    $secondErrors = $this->getErrors();
                    $this->checkUndefined($v, $schema->additionalItems, $path, $k);
                }
                // Reset errors if needed
                if (isset($secondErrors) && count($secondErrors) < count($this->getErrors())) {
                    $this->errors = $secondErrors;
                }
                elseif (isset($secondErrors) && count($secondErrors) === count($this->getErrors())) {
                    $this->errors = $initErrors;
                }
            }
            unset($v);
            
            /* remove dangling reference to prevent any future bugs
             * caused by accidentally using $v elsewhere */
        }
        else {
            // Defined item type definitions
            foreach ($value as $k => &$v) {
                if (array_key_exists($k, $schema->items)) {
                    $this->checkUndefined($v, $schema->items[$k], $path, $k);
                }
                else {
                    // Additional items
                    if (property_exists($schema, 'additionalItems')) {
                        if ($schema->additionalItems !== false) {
                            $this->checkUndefined($v, $schema->additionalItems, $path, $k);
                        }
                        else {
                            $this->addError($path, 'The item ' . $i . '[' . $k . '] is not defined and the definition does not allow additional items', 'additionalItems', array(
                                'additionalItems' => $schema->additionalItems,
                            ));
                        }
                    }
                    else {
                        // Should be valid against an empty schema
                        $this->checkUndefined($v, new \stdClass(), $path, $k);
                    }
                }
            }
            unset($v);
            
            /* remove dangling reference to prevent any future bugs
             * caused by accidentally using $v elsewhere */
            // Treat when we have more schema definitions than values, not for empty arrays
            if (count($value) > 0) {
                for ($k = count($value); $k < count($schema->items); $k++) {
                    $undefinedInstance = $this->factory
                        ->createInstanceFor('undefined');
                    $this->checkUndefined($undefinedInstance, $schema->items[$k], $path, $k);
                }
            }
        }
    }

}