<?php

/**
 * SPDX-FileCopyrightText: 2016-2024 Nextcloud GmbH and Nextcloud contributors
 * SPDX-FileCopyrightText: 2016 ownCloud, Inc.
 * SPDX-License-Identifier: AGPL-3.0-only
 */
namespace OCA\DAV\CardDAV;

use OCP\Constants;
use OCP\IAddressBook;
use OCP\IURLGenerator;
use Sabre\VObject\Component\VCard;
use Sabre\VObject\Property;
use Sabre\VObject\Reader;
use Sabre\VObject\UUIDUtil;

class AddressBookImpl implements IAddressBook {

	/**
	 * AddressBookImpl constructor.
	 *
	 * @param AddressBook $addressBook
	 * @param array $addressBookInfo
	 * @param CardDavBackend $backend
	 * @param IUrlGenerator $urlGenerator
	 */
	public function __construct(
		private AddressBook $addressBook,
		private array $addressBookInfo,
		private CardDavBackend $backend,
		private IURLGenerator $urlGenerator,
	) {
	}

	/**
	 * @return string defining the technical unique key
	 * @since 5.0.0
	 */
	public function getKey() {
		return $this->addressBookInfo['id'];
	}

	/**
	 * @return string defining the unique uri
	 * @since 16.0.0
	 */
	public function getUri(): string {
		return $this->addressBookInfo['uri'];
	}

	/**
	 * In comparison to getKey() this function returns a human readable (maybe translated) name
	 *
	 * @return mixed
	 * @since 5.0.0
	 */
	public function getDisplayName() {
		return $this->addressBookInfo['{DAV:}displayname'];
	}

	/**
	 * @param string $pattern which should match within the $searchProperties
	 * @param array $searchProperties defines the properties within the query pattern should match
	 * @param array $options Options to define the output format and search behavior
	 *                       - 'types' boolean (since 15.0.0) If set to true, fields that come with a TYPE property will be an array
	 *                       example: ['id' => 5, 'FN' => 'Thomas Tanghus', 'EMAIL' => ['type => 'HOME', 'value' => 'g@h.i']]
	 *                       - 'escape_like_param' - If set to false wildcards _ and % are not escaped
	 *                       - 'limit' - Set a numeric limit for the search results
	 *                       - 'offset' - Set the offset for the limited search results
	 *                       - 'wildcard' - Whether the search should use wildcards
	 * @psalm-param array{types?: bool, escape_like_param?: bool, limit?: int, offset?: int, wildcard?: bool} $options
	 * @return array an array of contacts which are arrays of key-value-pairs
	 *               example result:
	 *               [
	 *               ['id' => 0, 'FN' => 'Thomas Müller', 'EMAIL' => 'a@b.c', 'GEO' => '37.386013;-122.082932'],
	 *               ['id' => 5, 'FN' => 'Thomas Tanghus', 'EMAIL' => ['d@e.f', 'g@h.i']]
	 *               ]
	 * @since 5.0.0
	 */
	public function search($pattern, $searchProperties, $options) {
		$results = $this->backend->search($this->getKey(), $pattern, $searchProperties, $options);

		$withTypes = \array_key_exists('types', $options) && $options['types'] === true;

		$vCards = [];
		foreach ($results as $result) {
			$vCards[] = $this->vCard2Array($result['uri'], $this->readCard($result['carddata']), $withTypes);
		}

		return $vCards;
	}

	/**
	 * @param array $properties this array if key-value-pairs defines a contact
	 * @return array an array representing the contact just created or updated
	 * @since 5.0.0
	 */
	public function createOrUpdate($properties) {
		$update = false;
		if (!isset($properties['URI'])) { // create a new contact
			$uid = $this->createUid();
			$uri = $uid . '.vcf';
			$vCard = $this->createEmptyVCard($uid);
		} else { // update existing contact
			$uri = $properties['URI'];
			$vCardData = $this->backend->getCard($this->getKey(), $uri);
			$vCard = $this->readCard($vCardData['carddata']);
			$update = true;
		}

		foreach ($properties as $key => $value) {
			if (is_array($value)) {
				$vCard->remove($key);
				foreach ($value as $entry) {
					if (is_string($entry)) {
						$property = $vCard->createProperty($key, $entry);
					} else {
						if (($key === 'ADR' || $key === 'PHOTO') && is_string($entry['value'])) {
							$entry['value'] = stripslashes($entry['value']);
							$entry['value'] = explode(';', $entry['value']);
						}
						$property = $vCard->createProperty($key, $entry['value']);
						if (isset($entry['type'])) {
							$property->add('TYPE', $entry['type']);
						}
					}
					$vCard->add($property);
				}
			} elseif ($key !== 'URI') {
				$vCard->$key = $vCard->createProperty($key, $value);
			}
		}

		if ($update) {
			$this->backend->updateCard($this->getKey(), $uri, $vCard->serialize());
		} else {
			$this->backend->createCard($this->getKey(), $uri, $vCard->serialize());
		}

		return $this->vCard2Array($uri, $vCard);
	}

	/**
	 * @return mixed
	 * @since 5.0.0
	 */
	public function getPermissions() {
		$permissions = $this->addressBook->getACL();
		$result = 0;
		foreach ($permissions as $permission) {
			switch ($permission['privilege']) {
				case '{DAV:}read':
					$result |= Constants::PERMISSION_READ;
					break;
				case '{DAV:}write':
					$result |= Constants::PERMISSION_CREATE;
					$result |= Constants::PERMISSION_UPDATE;
					break;
				case '{DAV:}all':
					$result |= Constants::PERMISSION_ALL;
					break;
			}
		}

		return $result;
	}

	/**
	 * @param int $id the unique identifier to a contact
	 * @return bool successful or not
	 * @since 5.0.0
	 */
	public function delete($id) {
		$uri = $this->backend->getCardUri($id);
		return $this->backend->deleteCard($this->addressBookInfo['id'], $uri);
	}

	/**
	 * read vCard data into a vCard object
	 *
	 * @param string $cardData
	 * @return VCard
	 */
	protected function readCard($cardData) {
		return  Reader::read($cardData);
	}

	/**
	 * create UID for contact
	 *
	 * @return string
	 */
	protected function createUid() {
		do {
			$uid = $this->getUid();
			$contact = $this->backend->getContact($this->getKey(), $uid . '.vcf');
		} while (!empty($contact));

		return $uid;
	}

	/**
	 * getUid is only there for testing, use createUid instead
	 */
	protected function getUid() {
		return UUIDUtil::getUUID();
	}

	/**
	 * create empty vcard
	 *
	 * @param string $uid
	 * @return VCard
	 */
	protected function createEmptyVCard($uid) {
		$vCard = new VCard();
		$vCard->UID = $uid;
		return $vCard;
	}

	/**
	 * create array with all vCard properties
	 *
	 * @param string $uri
	 * @param VCard $vCard
	 * @param boolean $withTypes (optional) return the values as arrays of value/type pairs
	 * @return array
	 */
	protected function vCard2Array($uri, VCard $vCard, $withTypes = false) {
		$result = [
			'URI' => $uri,
		];

		foreach ($vCard->children() as $property) {
			if ($property->name === 'PHOTO' && in_array($property->getValueType(), ['BINARY', 'URI'])) {
				$url = $this->urlGenerator->getAbsoluteURL(
					$this->urlGenerator->linkTo('', 'remote.php') . '/dav/');
				$url .= implode('/', [
					'addressbooks',
					substr($this->addressBookInfo['principaluri'], 11), //cut off 'principals/'
					$this->addressBookInfo['uri'],
					$uri
				]) . '?photo';

				$result['PHOTO'] = 'VALUE=uri:' . $url;
			} elseif (in_array($property->name, ['URL', 'GEO', 'CLOUD', 'ADR', 'EMAIL', 'IMPP', 'TEL', 'X-SOCIALPROFILE', 'RELATED', 'LANG', 'X-ADDRESSBOOKSERVER-MEMBER'])) {
				if (!isset($result[$property->name])) {
					$result[$property->name] = [];
				}

				$type = $this->getTypeFromProperty($property);
				if ($withTypes) {
					$result[$property->name][] = [
						'type' => $type,
						'value' => $property->getValue()
					];
				} else {
					$result[$property->name][] = $property->getValue();
				}
			} else {
				$result[$property->name] = $property->getValue();
			}
		}

		if ($this->isSystemAddressBook()) {
			$result['isLocalSystemBook'] = true;
		}
		return $result;
	}

	/**
	 * Get the type of the current property
	 *
	 * @param Property $property
	 * @return null|string
	 */
	protected function getTypeFromProperty(Property $property) {
		$parameters = $property->parameters();
		// Type is the social network, when it's empty we don't need this.
		if (isset($parameters['TYPE'])) {
			/** @var \Sabre\VObject\Parameter $type */
			$type = $parameters['TYPE'];
			return $type->getValue();
		}

		return null;
	}

	/**
	 * @inheritDoc
	 */
	public function isShared(): bool {
		if (!isset($this->addressBookInfo['{http://owncloud.org/ns}owner-principal'])) {
			return false;
		}

		return $this->addressBookInfo['principaluri']
			!== $this->addressBookInfo['{http://owncloud.org/ns}owner-principal'];
	}

	/**
	 * @inheritDoc
	 */
	public function isSystemAddressBook(): bool {
		return $this->addressBookInfo['principaluri'] === 'principals/system/system' && (
			$this->addressBookInfo['uri'] === 'system' ||
			$this->addressBookInfo['{DAV:}displayname'] === $this->urlGenerator->getBaseUrl()
		);
	}
}