<?php

declare(strict_types=1);

/**
 * SPDX-FileCopyrightText: 2025 Nextcloud GmbH and Nextcloud contributors
 * SPDX-License-Identifier: AGPL-3.0-or-later
 */

namespace OCA\Settings\SetupChecks;

use OCP\AppFramework\Utility\ITimeFactory;
use OCP\IL10N;
use OCP\SetupCheck\ISetupCheck;
use OCP\SetupCheck\SetupResult;
use OCP\TaskProcessing\IManager;
use OCP\TaskProcessing\Task;

class TaskProcessingSuccessRate implements ISetupCheck {
	public const MAX_FAILURE_PERCENTAGE = 0.2;

	public const MAX_DAYS = 14;

	public function __construct(
		private IL10N $l10n,
		private IManager $taskProcessingManager,
		private ITimeFactory $timeFactory,
	) {
	}

	public function getCategory(): string {
		return 'ai';
	}

	public function getName(): string {
		return $this->l10n->t('Task Processing pickup speed');
	}

	public function run(): SetupResult {
		$taskCount = 0;
		$lastNDays = 1;
		while ($taskCount === 0 && $lastNDays < self::MAX_DAYS) {
			$lastNDays++;
			// userId: '' means no filter, whereas null would mean guest
			$tasks = $this->taskProcessingManager->getTasks(userId: '', scheduleAfter: $this->timeFactory->now()->getTimestamp() - (60 * 60 * 24 * $lastNDays));
			$taskCount = count($tasks);
		}
		if ($taskCount === 0) {
			return SetupResult::success(
				$this->l10n->n(
					'No scheduled tasks in the last %n hour.',
					'No scheduled tasks in the last %n hours.',
					24 * $lastNDays
				)
			);
		}
		$failedCount = 0;
		foreach ($tasks as $task) {
			if ($task->getEndedAt() !== null) {
				continue; // task was not picked up yet
			}
			$status = $task->getStatus();
			if ($status === Task::STATUS_FAILED) {
				$failedCount++;
			}
		}

		if (($failedCount / $taskCount) < self::MAX_FAILURE_PERCENTAGE) {
			return SetupResult::success(
				$this->l10n->n(
					'Most tasks were successful in the last %n hour.',
					'Most tasks were successful in the last %n hours.',
					24 * $lastNDays
				)
			);
		} else {
			return SetupResult::warning(
				$this->l10n->n(
					'A lot of tasks failed in the last %n hour. Consider checking the nextcloud log for errors and investigating whether the AI provider apps have been set up correctly.',
					'A lot of tasks failed in the last %n hours. Consider checking the nextcloud log for errors and investigating whether the AI provider apps have been set up correctly.',
					24 * $lastNDays
				),
				'https://docs.nextcloud.com/server/latest/admin_manual/ai/insight_and_debugging.html'
			);
		}
	}
}