<?php

namespace App\Services;

use App\Jobs\AvatarPipeline\AvatarStorageCleanup;
use App\Jobs\MediaPipeline\MediaDeletePipeline;
use App\Jobs\StatusPipeline\NewStatusPipeline;
use App\Models\Media;
use App\Models\Status;
use App\Util\ActivityPub\Helpers;
use Illuminate\Http\File;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;

class MediaStorageService
{
    public static function store(Media $media)
    {
        if ((bool) config_cache('pixelfed.cloud_storage') === true && config('filesystems.default') === 'local') {
            (new self)->cloudStore($media);
        }
    }

    public static function move(Media $media)
    {
        if ($media->remote_media) {
            return;
        }

        if ((bool) config_cache('pixelfed.cloud_storage') === true && config('filesystems.default') === 'local') {
            return (new self)->cloudMove($media);
        }
    }

    public static function avatar($avatar, $local = false, $skipRecentCheck = false)
    {
        return (new self)->fetchAvatar($avatar, $local, $skipRecentCheck);
    }

    public static function head($url)
    {
        // SSRF-hardened: validates URL, resolves + rejects private/reserved
        // IPs, pins the connection to the validated address, and refuses to
        // follow redirects into internal networks. See SecureMediaFetchService.
        return SecureMediaFetchService::head($url, (int) config_cache('pixelfed.max_photo_size') * 1000);
    }

    protected function cloudStore($media)
    {
        if ($media->remote_media == true) {
            if (config('media.storage.remote.cloud')) {
                (new self)->remoteToCloud($media);
            }
        } else {
            (new self)->localToCloud($media);
        }

        /*
         * Read status_id fresh from the database.
         *
         * $media was unserialized when MediaStoragePipeline started. A status
         * can be attached to it (POST /api/v1/statuses) while the upload above
         * is in flight, in which case $media->status_id is a stale null and
         * the NewStatusPipeline dispatched by the controller has already
         * returned early because cdn_url was not set yet. Trusting the stale
         * value here means that post is never lexed or federated.
         */
        $statusId = Media::whereKey($media->id)->value('status_id');

        if (! $statusId) {
            return;
        }

        if ($statusId != $media->status_id) {
            // Attached mid-upload: localToCloud() skipped these with the stale null.
            Cache::forget('pf:status:ap:v1:sid:'.$statusId);
            Cache::forget('status:transformer:media:attachments:'.$statusId);
            MediaService::del($statusId);
            StatusService::del($statusId, false);
        }

        if (config_cache('pixelfed.cloud_storage') && ! config('pixelfed.media_fast_process')) {
            $still_processing = Media::whereStatusId($statusId)
                ->whereNull('cdn_url')
                ->exists();
            if (! $still_processing) {
                // In this configuration, publishing the status is delayed until the media uploads
                // Since all media have been processed, we can kick the NewStatusPipeline job
                // N.B. there's a timing condition with multiple MediaStorageService workers matching this if statement
                // NewStatusPipeline holds a short lock so the status is only lexed and federated once
                $status = Status::where('id', $statusId)->first(); // This could be null if the status was deleted
                if ($status) {
                    NewStatusPipeline::dispatch($status);
                }
            }
        }
    }

    protected function localToCloud($media)
    {
        $path = storage_path('app/'.$media->media_path);
        $thumb = null;
        $thumbname = null;

        if ($media->thumbnail_path) {
            $thumb = storage_path('app/'.$media->thumbnail_path);
        }

        $p = explode('/', $media->media_path);
        $name = array_pop($p);
        $pt = explode('/', $media->thumbnail_path);
        $thumbname = array_pop($pt);
        $storagePath = implode('/', $p);

        $url = ResilientMediaStorageService::store($storagePath, $path, $name);
        if ($media->thumbnail_path) {
            $thumbUrl = ResilientMediaStorageService::store($storagePath, $thumb, $thumbname);
            $media->thumbnail_url = $thumbUrl;
        }
        $media->cdn_url = $url;
        $media->optimized_url = $url;
        $media->replicated_at = now();
        $media->save();
        if ((bool) config_cache('pixelfed.cloud_storage') && (bool) config('media.delete_local_after_cloud')) {
            $s3Domain = config('filesystems.disks.s3.url') ?? config('filesystems.disks.s3.endpoint');
            if (str_contains($url, $s3Domain)) {
                if (file_exists($path)) {
                    unlink($path);
                }

                if (file_exists($thumb)) {
                    unlink($thumb);
                }
            }
        }
        if ($media->status_id) {
            Cache::forget('pf:status:ap:v1:sid:'.$media->status_id);
            Cache::forget('status:transformer:media:attachments:'.$media->status_id);
            MediaService::del($media->status_id);
            StatusService::del($media->status_id, false);
        }
    }

    protected function remoteToCloud($media)
    {
        $url = $media->remote_url;

        if (! Helpers::validateUrl($url)) {
            return;
        }

        // Hardened HEAD (IP-validated, pinned, no internal redirects).
        $head = static::head($url);

        if (! $head) {
            return;
        }

        $mimes = [
            'image/jpg',
            'image/jpeg',
            'image/png',
            'video/mp4',
        ];

        $mime = $head['mime'];
        $max_size = (int) config_cache('pixelfed.max_photo_size') * 1000;
        $media->size = $head['length'];
        $media->remote_media = true;
        $media->save();

        if (! in_array($mime, $mimes)) {
            return;
        }

        if ($head['length'] >= $max_size) {
            return;
        }

        $ext = '';

        switch ($mime) {
            case 'image/png':
                $ext = '.png';
                break;

            case 'image/gif':
                $ext = '.gif';
                break;

            case 'image/jpg':
            case 'image/jpeg':
                $ext = '.jpg';
                break;

            case 'video/mp4':
                $ext = '.mp4';
                break;
        }

        $base = MediaPathService::get($media->profile);
        $path = Str::random(40).$ext;
        $tmpBase = storage_path('app/remcache/');
        $tmpPath = $media->profile_id.'-'.$path;
        $tmpName = $tmpBase.$tmpPath;
        // Hardened byte fetch through the same validated, pinned, redirect-safe path.
        $data = SecureMediaFetchService::get($url, $max_size, $head['length']);
        if ($data === false) {
            return;
        }
        file_put_contents($tmpName, $data);

        try {
            $hash = hash_file('sha256', $tmpName);

            $disk = Storage::disk(config('filesystems.cloud'));
            $file = $disk->putFileAs($base, new File($tmpName), $path, 'public');
            $permalink = $disk->url($file);

            $media->media_path = $file;
            $media->cdn_url = $permalink;
            $media->original_sha256 = $hash;
            $media->replicated_at = now();
            $media->save();

            if ($media->status_id) {
                Cache::forget('status:transformer:media:attachments:'.$media->status_id);
            }
        } finally {
            if (is_file($tmpName)) {
                @unlink($tmpName);
            }
        }
    }

    protected function fetchAvatar($avatar, $local = false, $skipRecentCheck = false)
    {
        $queue = random_int(1, 15) > 5 ? 'mmo' : 'low';
        $url = $avatar->remote_url;
        $driver = $local ? 'local' : config('filesystems.cloud');

        if (empty($url) || Helpers::validateUrl($url) == false) {
            return;
        }

        $head = static::head($url);

        if ($head == false) {
            return;
        }

        $mimes = [
            'application/octet-stream',
            'image/jpg',
            'image/jpeg',
            'image/png',
        ];

        $mime = $head['mime'];
        $max_size = (int) config('pixelfed.max_avatar_size') * 1000;

        if (! $skipRecentCheck) {
            if ($avatar->last_fetched_at && $avatar->last_fetched_at->gt(now()->subMonths(3))) {
                return;
            }
        }

        Cache::forget('avatar:'.$avatar->profile_id);
        AccountService::del($avatar->profile_id);

        // handle pleroma edge case
        if (Str::endsWith($mime, '; charset=utf-8')) {
            $mime = str_replace('; charset=utf-8', '', $mime);
        }

        if (! in_array($mime, $mimes)) {
            return;
        }

        if ($head['length'] >= $max_size) {
            return;
        }

        $base = ($local ? 'public/cache/' : 'cache/').'avatars/'.$avatar->profile_id;
        $tmpBase = storage_path('app/remcache/');
        $data = SecureMediaFetchService::get($url, $max_size, $head['length']);
        if (! $data) {
            return;
        }

        $tmpPath = 'avatar_'.$avatar->profile_id.'-tmp';
        $tmpName = $tmpBase.$tmpPath;
        file_put_contents($tmpName, $data);

        try {
            $mimeCheck = Storage::mimeType('remcache/'.$tmpPath);

            if (! $mimeCheck || ! in_array($mimeCheck, ['image/png', 'image/jpeg', 'image/jpg'])) {
                $avatar->last_fetched_at = now();
                $avatar->save();

                return;
            }

            $ext = ($mimeCheck === 'image/png') ? 'png' : 'jpg';
            $path = 'avatar_'.strtolower(Str::random(random_int(3, 6))).'.'.$ext;

            $disk = Storage::disk($driver);
            $file = $disk->putFileAs($base, new File($tmpName), $path, 'public');
            $permalink = $disk->url($file);

            $avatar->media_path = $base.'/'.$path;
            $avatar->is_remote = true;
            $avatar->cdn_url = $local ? config('app.url').$permalink : $permalink;
            $avatar->size = $head['length'];
            $avatar->change_count = $avatar->change_count + 1;
            $avatar->last_fetched_at = now();
            $avatar->save();

            Cache::forget('avatar:'.$avatar->profile_id);
            AccountService::del($avatar->profile_id);
            AvatarStorageCleanup::dispatch($avatar)->onQueue($queue)->delay(now()->addMinutes(random_int(3, 15)));
        } finally {
            if (is_file($tmpName)) {
                @unlink($tmpName);
            }
        }
    }

    public static function delete(Media $media, $confirm = false)
    {
        if (! $confirm) {
            return;
        }
        MediaDeletePipeline::dispatch($media)->onQueue('mmo');
    }

    protected function cloudMove($media)
    {
        if (! Storage::exists($media->media_path)) {
            return 'invalid file';
        }

        $path = storage_path('app/'.$media->media_path);
        $thumb = null;
        $thumbname = null;

        if ($media->thumbnail_path) {
            $thumb = storage_path('app/'.$media->thumbnail_path);
            $pt = explode('/', $media->thumbnail_path);
            $thumbname = array_pop($pt);
        }

        $p = explode('/', $media->media_path);
        $name = array_pop($p);
        $storagePath = implode('/', $p);

        $url = ResilientMediaStorageService::store($storagePath, $path, $name);
        if ($thumb) {
            $thumbUrl = ResilientMediaStorageService::store($storagePath, $thumb, $thumbname);
            $media->thumbnail_url = $thumbUrl;
        }
        $media->cdn_url = $url;
        $media->optimized_url = $url;
        $media->replicated_at = now();
        $media->save();

        if ($media->status_id) {
            Cache::forget('status:transformer:media:attachments:'.$media->status_id);
            MediaService::del($media->status_id);
            StatusService::del($media->status_id, false);
        }

        return 'success';
    }
}