class ChoiceFormField

class ChoiceFormField extends FormField {
    private string $type;
    private bool $multiple;
    private array $options;
    private bool $validationDisabled = false;
    
    /**
     * Returns true if the field should be included in the submitted values.
     *
     * @return bool true if the field should be included in the submitted values, false otherwise
     */
    public function hasValue() : bool {
        // don't send a value for unchecked checkboxes
        if (\in_array($this->type, [
            'checkbox',
            'radio',
        ]) && null === $this->value) {
            return false;
        }
        return true;
    }
    
    /**
     * Check if the current selected option is disabled.
     */
    public function isDisabled() : bool {
        if (parent::isDisabled() && 'select' === $this->type) {
            return true;
        }
        foreach ($this->options as $option) {
            if ($option['value'] == $this->value && $option['disabled']) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Sets the value of the field.
     */
    public function select(string|array|bool $value) : void {
        $this->setValue($value);
    }
    
    /**
     * Ticks a checkbox.
     *
     * @throws \LogicException When the type provided is not correct
     */
    public function tick() : void {
        if ('checkbox' !== $this->type) {
            throw new \LogicException(\sprintf('You cannot tick "%s" as it is not a checkbox (%s).', $this->name, $this->type));
        }
        $this->setValue(true);
    }
    
    /**
     * Unticks a checkbox.
     *
     * @throws \LogicException When the type provided is not correct
     */
    public function untick() : void {
        if ('checkbox' !== $this->type) {
            throw new \LogicException(\sprintf('You cannot untick "%s" as it is not a checkbox (%s).', $this->name, $this->type));
        }
        $this->setValue(false);
    }
    
    /**
     * Sets the value of the field.
     *
     * @throws \InvalidArgumentException When value type provided is not correct
     */
    public function setValue(string|array|bool|null $value) : void {
        if ('checkbox' === $this->type && false === $value) {
            // uncheck
            $this->value = null;
        }
        elseif ('checkbox' === $this->type && true === $value) {
            // check
            $this->value = $this->options[0]['value'];
        }
        else {
            if (\is_array($value)) {
                if (!$this->multiple) {
                    throw new \InvalidArgumentException(\sprintf('The value for "%s" cannot be an array.', $this->name));
                }
                foreach ($value as $v) {
                    if (!$this->containsOption($v, $this->options)) {
                        throw new \InvalidArgumentException(\sprintf('Input "%s" cannot take "%s" as a value (possible values: "%s").', $this->name, $v, implode('", "', $this->availableOptionValues())));
                    }
                }
            }
            elseif (!$this->containsOption($value, $this->options)) {
                throw new \InvalidArgumentException(\sprintf('Input "%s" cannot take "%s" as a value (possible values: "%s").', $this->name, $value, implode('", "', $this->availableOptionValues())));
            }
            if ($this->multiple) {
                $value = (array) $value;
            }
            if (\is_array($value)) {
                $this->value = $value;
            }
            else {
                parent::setValue($value);
            }
        }
    }
    
    /**
     * Adds a choice to the current ones.
     *
     * @throws \LogicException When choice provided is not multiple nor radio
     *
     * @internal
     */
    public function addChoice(\DOMElement $node) : void {
        if (!$this->multiple && 'radio' !== $this->type) {
            throw new \LogicException(\sprintf('Unable to add a choice for "%s" as it is not multiple or is not a radio button.', $this->name));
        }
        $option = $this->buildOptionValue($node);
        $this->options[] = $option;
        if ($node->hasAttribute('checked')) {
            $this->value = $option['value'];
        }
    }
    
    /**
     * Returns the type of the choice field (radio, select, or checkbox).
     */
    public function getType() : string {
        return $this->type;
    }
    
    /**
     * Returns true if the field accepts multiple values.
     */
    public function isMultiple() : bool {
        return $this->multiple;
    }
    
    /**
     * Initializes the form field.
     *
     * @throws \LogicException When node type is incorrect
     */
    protected function initialize() : void {
        if ('input' !== $this->node->nodeName && 'select' !== $this->node->nodeName) {
            throw new \LogicException(\sprintf('A ChoiceFormField can only be created from an input or select tag (%s given).', $this->node->nodeName));
        }
        if ('input' === $this->node->nodeName && 'checkbox' !== strtolower($this->node
            ->getAttribute('type')) && 'radio' !== strtolower($this->node
            ->getAttribute('type'))) {
            throw new \LogicException(\sprintf('A ChoiceFormField can only be created from an input tag with a type of checkbox or radio (given type is "%s").', $this->node
                ->getAttribute('type')));
        }
        $this->value = null;
        $this->options = [];
        $this->multiple = false;
        if ('input' == $this->node->nodeName) {
            $this->type = strtolower($this->node
                ->getAttribute('type'));
            $optionValue = $this->buildOptionValue($this->node);
            $this->options[] = $optionValue;
            if ($this->node
                ->hasAttribute('checked')) {
                $this->value = $optionValue['value'];
            }
        }
        else {
            $this->type = 'select';
            if ($this->node
                ->hasAttribute('multiple')) {
                $this->multiple = true;
                $this->value = [];
                $this->name = str_replace('[]', '', $this->name);
            }
            $found = false;
            foreach ($this->xpath
                ->query('descendant::option', $this->node) as $option) {
                $optionValue = $this->buildOptionValue($option);
                $this->options[] = $optionValue;
                if ($option->hasAttribute('selected')) {
                    $found = true;
                    if ($this->multiple) {
                        $this->value[] = $optionValue['value'];
                    }
                    else {
                        $this->value = $optionValue['value'];
                    }
                }
            }
            // if no option is selected and if it is a simple select box, take the first option as the value
            if (!$found && !$this->multiple && $this->options) {
                $this->value = $this->options[0]['value'];
            }
        }
    }
    
    /**
     * Returns option value with associated disabled flag.
     */
    private function buildOptionValue(\DOMElement $node) : array {
        $option = [];
        $defaultDefaultValue = 'select' === $this->node->nodeName ? '' : 'on';
        $defaultValue = isset($node->nodeValue) && $node->nodeValue ? $node->nodeValue : $defaultDefaultValue;
        $option['value'] = $node->hasAttribute('value') ? $node->getAttribute('value') : $defaultValue;
        $option['disabled'] = $node->hasAttribute('disabled');
        return $option;
    }
    
    /**
     * Checks whether given value is in the existing options.
     *
     * @internal
     */
    public function containsOption(string $optionValue, array $options) : bool {
        if ($this->validationDisabled) {
            return true;
        }
        foreach ($options as $option) {
            if ($option['value'] == $optionValue) {
                return true;
            }
        }
        return false;
    }
    
    /**
     * Returns list of available field options.
     *
     * @internal
     */
    public function availableOptionValues() : array {
        $values = [];
        foreach ($this->options as $option) {
            $values[] = $option['value'];
        }
        return $values;
    }
    
    /**
     * Disables the internal validation of the field.
     *
     * @internal
     *
     * @return $this
     */
    public function disableValidation() : static {
        $this->validationDisabled = true;
        return $this;
    }

}