<?php

declare(strict_types=1);

// SPDX-FileCopyrightText: Chen Asraf <contact@casraf.dev>
// SPDX-License-Identifier: AGPL-3.0-or-later

namespace OCA\Jukebox\Controller;

use OCA\Jukebox\Db\VideoMapper;
use OCP\AppFramework\Http;
use OCP\AppFramework\Http\Attribute\ApiRoute;
use OCP\AppFramework\Http\Attribute\NoAdminRequired;
use OCP\AppFramework\Http\Attribute\NoCSRFRequired;
use OCP\AppFramework\Http\JSONResponse;
use OCP\AppFramework\OCSController;
use OCP\Files\File;
use OCP\Files\IRootFolder;
use OCP\Files\NotFoundException;
use OCP\IAppConfig;
use OCP\IL10N;
use OCP\IRequest;
use OCP\IUserSession;
use Psr\Log\LoggerInterface;

class VideoController extends OCSController {
	/**
	 * Video constructor.
	 */
	public function __construct(
		string $appName,
		IRequest $request,
		private IAppConfig $config,
		private IL10N $l,
		private LoggerInterface $logger,
		private VideoMapper $videoMapper,
		private IUserSession $userSession,
		private IRootFolder $rootFolder,
	) {
		parent::__construct($appName, $request);
	}

	/**
	 * List all videos for the current user
	 *
	 * @return JSONResponse<Http::STATUS_OK, array{videos: list<array<string, mixed>>}, array{}>
	 *
	 * 200: List of videos for current user
	 */
	#[NoAdminRequired]
	#[ApiRoute(verb: 'GET', url: '/api/video')]
	public function index(): JSONResponse {
		$user = $this->userSession->getUser();
		if (!$user) {
			return new JSONResponse(['message' => 'Unauthenticated'], Http::STATUS_UNAUTHORIZED);
		}

		$videos = $this->videoMapper->findByUserId($user->getUID());
		return new JSONResponse(['videos' => array_map(fn ($v) => $v->jsonSerialize(), $videos)]);
	}

	/**
	 * Get a single video by ID
	 *
	 * @param int $id Video ID
	 *
	 * @return JSONResponse<Http::STATUS_OK, array<string, mixed>, array{}>
	 * @return JSONResponse<Http::STATUS_NOT_FOUND, array{message: string}, array{}>
	 *
	 * 200: Video details
	 * 404: Video not found
	 */
	#[NoAdminRequired]
	#[ApiRoute(verb: 'GET', url: '/api/video/{id}')]
	public function show(int $id): JSONResponse {
		$user = $this->userSession->getUser();
		if (!$user) {
			return new JSONResponse(['message' => 'Unauthenticated'], Http::STATUS_UNAUTHORIZED);
		}

		try {
			$video = $this->videoMapper->find($user->getUID(), (string)$id);
			return new JSONResponse($video->jsonSerialize());
		} catch (NotFoundException $e) {
			return new JSONResponse(['message' => 'Video not found'], Http::STATUS_NOT_FOUND);
		}
	}

	/**
	 * Stream a video file for playback with range request support
	 *
	 * @param int $id Video ID
	 *
	 * @return JSONResponse<Http::STATUS_UNAUTHORIZED, array{message: string}, array{}>
	 *
	 * 401: User not authenticated
	 */
	#[NoAdminRequired]
	#[NoCSRFRequired]
	#[ApiRoute(verb: 'GET', url: '/api/video/{id}/stream')]
	public function streamVideo(int $id) {
		$this->logger->info('Received request to stream video with ID: ' . $id);

		$user = $this->userSession->getUser();
		if (!$user) {
			return new JSONResponse(['message' => 'Unauthenticated'], Http::STATUS_UNAUTHORIZED);
		}

		$this->logger->info('Streaming video with ID: ' . $id, ['user' => $user->getUID()]);

		try {
			$video = $this->videoMapper->find($user->getUID(), (string)$id);

			$file = $this->rootFolder->get($video->getPath());

			if (!($file instanceof File)) {
				$this->logger->error('Video file not found: ' . $video->getPath());
				throw new NotFoundException();
			}

			// Get file info
			$fileSize = $file->getSize();
			$mimeType = $file->getMimeType();

			// Handle range requests for video seeking
			$rangeHeader = $this->request->getHeader('range');
			$start = 0;
			$end = $fileSize - 1;
			$statusCode = Http::STATUS_OK;

			if ($rangeHeader && preg_match('/bytes=(\d+)-(\d*)/', $rangeHeader, $matches)) {
				$start = (int)$matches[1];
				$end = $matches[2] !== '' ? (int)$matches[2] : $end;
				$statusCode = Http::STATUS_PARTIAL_CONTENT;
			}

			$length = $end - $start + 1;

			// Clear any previous output
			while (ob_get_level() > 0) {
				ob_end_clean();
			}

			// Set headers for streaming
			http_response_code($statusCode);
			header('Content-Type: ' . $mimeType);
			header('Content-Length: ' . $length);
			header('Accept-Ranges: bytes');
			header('Cache-Control: public, max-age=86400');
			header('Content-Disposition: inline; filename="' . basename($file->getName()) . '"');
			header('X-Content-Type-Options: nosniff');

			// Add CORS headers if needed
			header('Access-Control-Allow-Origin: *');
			header('Access-Control-Allow-Methods: GET, OPTIONS');
			header('Access-Control-Allow-Headers: Range, Content-Type');
			header('Access-Control-Expose-Headers: Content-Length, Content-Range, Accept-Ranges');

			if ($statusCode === Http::STATUS_PARTIAL_CONTENT) {
				header("Content-Range: bytes $start-$end/$fileSize");
			}

			// Stream the file in chunks
			$handle = $file->fopen('r');
			if ($handle === false) {
				$this->logger->error('Failed to open video file for streaming');
				http_response_code(500);
				exit;
			}

			if ($start > 0) {
				fseek($handle, $start);
			}

			$remaining = $length;
			$chunkSize = 1024 * 1024; // 1MB chunks for video

			while ($remaining > 0 && !feof($handle)) {
				$readSize = min($chunkSize, $remaining);
				$data = fread($handle, $readSize);
				if ($data === false) {
					break;
				}
				echo $data;
				flush();
				$remaining -= strlen($data);
			}

			fclose($handle);
			exit;
		} catch (NotFoundException $e) {
			$this->logger->error('Video file not found for ID: ' . $id, ['exception' => $e]);
			return new JSONResponse(['message' => 'Video not found'], Http::STATUS_NOT_FOUND);
		}
	}

}