<?php

declare(strict_types=1);

namespace OCA\NuqloudScrum\Service;

use OCP\Http\Client\IClientService;
use OCP\IRequest;
use OCP\IURLGenerator;

class TalkConversationPermissionService {
	public function __construct(
		private IRequest $request,
		private IURLGenerator $urlGenerator,
		private IClientService $clientService,
	) {
	}

	public function canCurrentUserModerateConversation(string $conversationToken): bool {
		$room = $this->fetchConversation($conversationToken);
		return is_array($room) && $this->extractModeratorFlag($room);
	}

	public function canCurrentUserAccessConversation(string $conversationToken): bool {
		return is_array($this->fetchConversation($conversationToken));
	}

	/** @return array<string, mixed>|null */
	private function fetchConversation(string $conversationToken): ?array {
		$conversationToken = trim($conversationToken);
		$cookieHeader = trim((string)$this->request->getHeader('cookie'));
		if ($conversationToken === '' || $cookieHeader === '') {
			return null;
		}

		$url = $this->urlGenerator->getAbsoluteURL(
			'/ocs/v2.php/apps/spreed/api/v4/room/' . rawurlencode($conversationToken) . '?format=json'
		);
		try {
			$response = $this->clientService->newClient()->get($url, [
				'timeout' => 15,
				'headers' => [
					'Accept' => 'application/json',
					'OCS-APIRequest' => 'true',
					'Cookie' => $cookieHeader,
				],
			]);
			$decoded = json_decode((string)$response->getBody(), true, 512, JSON_THROW_ON_ERROR);
		} catch (\Throwable) {
			return null;
		}

		$meta = is_array($decoded) ? ($decoded['ocs']['meta'] ?? null) : null;
		$data = is_array($decoded) ? ($decoded['ocs']['data'] ?? null) : null;
		if (!is_array($meta) || !is_array($data)) {
			return null;
		}
		return strtolower(trim((string)($meta['status'] ?? ''))) === 'ok' ? $data : null;
	}

	/** @param array<string, mixed> $room */
	private function extractModeratorFlag(array $room): bool {
		foreach (['canModerate', 'isModerator', 'isOwner', 'moderator', 'owner'] as $key) {
			if (array_key_exists($key, $room) && filter_var($room[$key], FILTER_VALIDATE_BOOLEAN)) {
				return true;
			}
		}
		foreach (['participantType', 'attendeeType', 'actorType'] as $key) {
			if (array_key_exists($key, $room)) {
				$type = (int)$room[$key];
				if ($type > 0 && $type <= 2) {
					return true;
				}
			}
		}
		foreach (['participant', 'self', 'attendee'] as $key) {
			if (isset($room[$key]) && is_array($room[$key]) && $this->extractModeratorFlag($room[$key])) {
				return true;
			}
		}
		return false;
	}
}