<?php

/*
 * This file is part of MailSo.
 *
 * (c) 2021 DJMaze
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 *
 * https://datatracker.ietf.org/doc/html/rfc5464
 */

namespace MailSo\Imap\Commands;

/**
 * @category MailSo
 * @package Imap
 */
trait Metadata
{

	/**
	 * Dovecot 2.2+ supports fetching all METADATA at once (wildcard).
	 * RFC 5464 doesn't specify this, but its earlier draft did, and Kolab uses it.
	 */
	private ?array $allMetadata = null;
	public function getAllMetadata() : array
	{
		if (null === $this->allMetadata) {
			$this->allMetadata = array();
			try {
				$arguments = [
					'(DEPTH infinity)',
					$this->EscapeString('*')
				];
				$arguments[] = '(' . \implode(' ', \array_map([$this, 'EscapeString'], ['/shared', '/private'])) . ')';
				$this->SendRequest('GETMETADATA', $arguments);
				foreach ($this->yieldUntaggedResponses() as $oResponse) {
					if (isset($oResponse->ResponseList[3])
						&& \is_array($oResponse->ResponseList[3])
						&& 'METADATA' === $oResponse->ResponseList[1]
					) {
						$aMetadata = array();
						$c = \count($oResponse->ResponseList[3]);
						for ($i = 0; $i < $c; $i += 2) {
							$aMetadata[$oResponse->ResponseList[3][$i]] = $oResponse->ResponseList[3][$i+1];
						}
						$this->allMetadata[$this->toUTF8($oResponse->ResponseList[2])] = $aMetadata;
					}
				}
			} catch (\Throwable $e) {
				//\SnappyMail\Log::warning('IMAP', $e->getMessage());
			}
		}
		return $this->allMetadata;
	}

	public function getMetadata(string $sFolderName, array $aEntries, array $aOptions = []) : array
	{
		$arguments = [];

		if ($aOptions) {
			$options = [];
			$aOptions = \array_intersect_key(
				\array_change_key_case($aOptions, CASE_UPPER),
				['MAXSIZE' => 0, 'DEPTH' => 0]
			);
			if (isset($aOptions['MAXSIZE']) && 0 < \intval($aOptions['MAXSIZE'])) {
				$options[] = 'MAXSIZE ' . \intval($aOptions['MAXSIZE']);
			}
			if (isset($aOptions['DEPTH']) && (1 == $aOptions['DEPTH'] || 'infinity' === $aOptions['DEPTH'])) {
				$options[] = "DEPTH {$aOptions['DEPTH']}";
			}
			if ($options) {
				$arguments[] = '(' . \implode(' ', $options) . ')';
			}
		}

		$arguments[] = $this->EscapeFolderName($sFolderName);

		$arguments[] = '(' . \implode(' ', \array_map([$this, 'EscapeString'], $aEntries)) . ')';

		$aReturn = array();
		$this->SendRequest('GETMETADATA', $arguments);
		foreach ($this->yieldUntaggedResponses() as $oResponse) {
			if (isset($oResponse->ResponseList[3])
				&& \is_array($oResponse->ResponseList[3])
				&& 'METADATA' === $oResponse->ResponseList[1]
			) {
				$c = \count($oResponse->ResponseList[3]);
				for ($i = 0; $i < $c; $i += 2) {
					$aReturn[$oResponse->ResponseList[3][$i]] = $oResponse->ResponseList[3][$i+1];
				}
			}
		}
		return $aReturn;
	}

	public function ServerGetMetadata(array $aEntries, array $aOptions = []) : array
	{
		return $this->hasCapability('METADATA-SERVER')
			? $this->getMetadata('', $aEntries, $aOptions)
			: [];
	}

	public function FolderGetMetadata(string $sFolderName, array $aEntries, array $aOptions = []) : array
	{
		return $this->hasCapability('METADATA')
			? $this->getMetadata($sFolderName, $aEntries, $aOptions)
			: [];
	}

	public function FolderSetMetadata(string $sFolderName, array $aEntries) : void
	{
		if ($this->hasCapability('METADATA')) {
			if (!$aEntries) {
				throw new \ValueError('Wrong argument for SETMETADATA command');
			}

			$arguments = [$this->EscapeFolderName($sFolderName)];

			\array_walk($aEntries, function(&$v, $k){
				$v = $this->EscapeString($k) . ' ' . $this->EscapeString($v);
			});
			$arguments[] = '(' . \implode(' ', $aEntries) . ')';

			$this->SendRequestGetResponse('SETMETADATA', $arguments);
		}
	}

	public function FolderRemoveMetadata($sFolderName, array $aEntries) : void
	{
		$this->FolderSetMetadata($sFolderName, \array_fill_keys(\array_keys($aEntries), null));
	}
}