<?php

namespace SilverStripe\Forms;

use SilverStripe\ORM\DataObjectInterface;

/**
 * Field for displaying phone numbers. It separates the number, the area code and optionally the country code
 * and extension.
 */
class PhoneNumberField extends FieldGroup {

	/**
	 * Default area code
	 *
	 * @var string
	 */
	protected $areaCode;

	/**
	 * Default country code
	 * @var string
	 */
	protected $countryCode;

	/**
	 * Default extension
	 *
	 * @var string
	 */
	protected $ext;

	/**
	 * @return NumericField
	 */
	public function getCountryField() {
		return $this->getChildField('Country');
	}

	/**
	 * @return NumericField
	 */
	public function getAreaField() {
		return $this->getChildField('Area');
	}

	/**
	 * @return NumericField
	 */
	public function getNumberField() {
		return $this->getChildField('Number');
	}

	/**
	 * @return NumericField
	 */
	public function getExtensionField() {
		/** @skipUpgrade */
		return $this->getChildField('Extension');
	}

	protected function getChildField($name) {
		$endsWith = "[{$name}]";
		foreach($this->getChildren() as $child) {

			/** @var Formfield $child */
			if(substr($child->getName(), 0 - strlen($endsWith)) === $endsWith) {
				return $child;
			}
		}
		return null;
	}

	public function __construct(
		$name, $title = null, $value = '', $extension = null, $areaCode = null, $countryCode = null
	) {
		$this->areaCode = $areaCode;
		$this->ext = $extension;
		$this->countryCode = $countryCode;

		// Build fields
		$fields = new FieldList();
		if($this->countryCode !== null) {
			$countryField = NumericField::create($name.'[Country]', false, $countryCode, 4)
				->addExtraClass('phonenumber-field__country');
			$fields->push($countryField);
		}

		if($this->areaCode !== null) {
			$areaField = NumericField::create($name.'[Area]', false, $areaCode, 4)
				->addExtraClass('phonenumber-field__area');
			$fields->push($areaField);
		}
		$numberField = NumericField::create($name.'[Number]', false, null, 10)
			->addExtraClass('phonenumber-field__number');
		$fields->push($numberField);

		if($this->ext !== null) {
			$extensionField = NumericField::create( $name.'[Extension]', false, $extension, 6)
				->addExtraClass('phonenumber-field__extension');
			$fields->push($extensionField);
		}

		parent::__construct($title, $fields);

		$this->setName($name);
		if (isset($value)) {
			$this->setValue($value);
		}
	}

	public function setName($name) {
		parent::setName($name);
		foreach($this->getChildren() as $child) {
			/** @var FormField $child */
			$thisName = $child->getName();
			$thisName = preg_replace('/^.*(\[\\w+\\])$/', $name . '\\1', $thisName);
			$child->setName($thisName);
		}
	}

	public function hasData() {
		return true;
	}

	/**
	 * @param array $properties
	 * @return string
	 */
	public function Field($properties = array()) {
		foreach($this->getChildren() as $field) {
			/** @var FormField $field */
			$field->setDisabled($this->isDisabled());
			$field->setReadonly($this->IsReadonly());
			$field->setForm($this->getForm());
		}
		return parent::Field($properties);
	}

	public function setValue( $value ) {
		$this->value = self::joinPhoneNumber( $value );
		$parts = $this->parseValue();
		if($countryField = $this->getCountryField()) {
			$countryField->setValue($parts['Country']);
		}
		if($areaField = $this->getAreaField()) {
			$areaField->setValue($parts['Area']);
		}
		$this->getNumberField()->setValue($parts['Number']);
		if ($extensionField = $this->getExtensionField()) {
			/** @skipUpgrade */
			$extensionField->setValue($parts['Extension']);
		}
		return $this;
	}

	/**
	 * Join phone number into a string
	 *
	 * @param array|string $value Input
	 * @return string
	 */
	public static function joinPhoneNumber( $value ) {
		if( is_array( $value ) ) {
			$completeNumber = '';
			if( !empty($value['Country'])) {
				$completeNumber .= '+' . $value['Country'];
			}

			if( !empty($value['Area'])) {
				$completeNumber .= '(' . $value['Area'] . ')';
			}

			$completeNumber .= $value['Number'];

			/** @skipUpgrade */
			if( !empty($value['Extension']) ) {
				$completeNumber .= '#' . $value['Extension'];
			}

			return $completeNumber;
		} else {
			return $value;
		}
	}

	/**
	 * Returns array with parsed phone format
	 *
	 * @return array Array with Country, Area, Number, and Extension keys (in order)
	 */
	protected function parseValue() {
		if (is_array($this->value)) {
			return $this->value;
		}
		// Parse value in form "+ countrycode (areacode) phone # extension"
		$valid = preg_match(
			'/^(?:(?:\+(?<Country>\d+))?\s*\((?<Area>\d+)\))?\s*(?<Number>[0-9A-Za-z]*)\s*(?:[#]\s*(?<Extension>\d+))?$/',
			$this->value,
			$parts
		);
		if(!$valid) {
			$parts = [];
		}
		/** @skipUpgrade */
		return array(
			'Country' => isset($parts['Country']) ? $parts['Country'] : '',
			'Area' => isset($parts['Area']) ? $parts['Area'] : '',
			'Number' => isset($parts['Number']) ? $parts['Number'] : '',
			'Extension' => isset($parts['Extension']) ? $parts['Extension'] : '',
		);
	}

	public function saveInto(DataObjectInterface $record) {
		$completeNumber = static::joinPhoneNumber($this->parseValue());
		$record->setCastedField($this->getName(), $completeNumber);
	}

	/**
	 * Validate this field
	 *
	 * @todo Very basic validation at the moment
	 *
	 * @param Validator $validator
	 * @return bool
	 */
	public function validate($validator){
		$valid = preg_match(
			'/^[0-9\+\-\(\)\s\#]*$/',
			$this->joinPhoneNumber($this->value)
		);

		if(!$valid){
			$validator->validationError(
				$this->name,
				_t('PhoneNumberField.VALIDATION', "Please enter a valid phone number"),
				"validation"
			);
			return false;
		}

		return true;
	}

	public function performReadonlyTransformation()
	{
		// Just setReadonly without casting to NumericField_Readonly
		$clone = clone $this;
		$clone->setReadonly(true);
		return $clone;
	}

	public function performDisabledTransformation()
	{
		// Just setDisabled without casting to NumericField_Disabled
		$clone = clone $this;
		$clone->setDisabled(true);
		return $clone;
	}
}