<?php

namespace App\Console\Commands;

use App\Models\Video;
use App\Models\VideoAudioTrack;
use App\Services\NasSyncService;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\DB;

class RepairMergedVideo extends Command
{
    protected $signature = 'videos:repair-merged {target : Target video encoded id (from the URL) or numeric id} {--source-id= : Force a specific source id from video_redirects} {--source-folder= : Override the source folder path (use when the redirect row has none — pre-repair-column merges)} {--dry-run : Show what would happen, do not modify anything}';

    protected $description = 'After a music-video merge, adopt any track subfolders still stuck in the source folder on NAS as new audio tracks on the target video. Safe to re-run.';

    public function handle(NasSyncService $nas): int
    {
        if (!$nas->isEnabled()) {
            $this->error('NAS is not reachable — cannot repair. Try again when NAS is back online.');
            return self::FAILURE;
        }

        $targetArg = $this->argument('target');
        $target    = is_numeric($targetArg)
            ? Video::find((int) $targetArg)
            : Video::find(Video::decodeId((string) $targetArg));
        if (!$target) {
            $this->error("Target video not found: {$targetArg}");
            return self::FAILURE;
        }
        $this->info("Target: [{$target->id}] {$target->title}");

        $redirects = DB::table('video_redirects')->where('target_id', $target->id);
        if ($sid = $this->option('source-id')) {
            $redirects->where('source_id', (int) $sid);
        }
        $redirects = $redirects->get();

        if ($redirects->isEmpty()) {
            $this->warn('No video_redirects rows found for this target.');
            return self::SUCCESS;
        }

        $dryRun  = (bool) $this->option('dry-run');
        $adopted = 0;

        $folderOverride = $this->option('source-folder');

        foreach ($redirects as $r) {
            $this->line('');
            $sourceFolder = $folderOverride ?: $r->source_folder;
            $this->info("Source id {$r->source_id} → folder: " . ($sourceFolder ?: '(unknown)'));

            if (!$sourceFolder) {
                $this->warn('  Skipping — no source_folder recorded. Pass --source-folder="users/…/music/…" to specify.');
                continue;
            }
            // Backfill the redirect row so future runs don't need the override.
            if (!$r->source_folder && !$dryRun && $folderOverride) {
                DB::table('video_redirects')->where('source_id', $r->source_id)
                    ->update(['source_folder' => $folderOverride]);
                $r->source_folder = $folderOverride;
            } else {
                $r->source_folder = $sourceFolder;
            }

            $tracksDir = $r->source_folder . '/tracks';
            $subdirs   = $nas->listNasDirs($tracksDir);
            if (empty($subdirs)) {
                $this->line('  No leftover track subfolders. Cleaning up empty source folder.');
                if (!$dryRun) {
                    $nas->deleteFile($r->source_folder . '/meta.json');
                    $nas->deleteFolder($tracksDir);
                    $nas->deleteFolder($r->source_folder);
                }
                continue;
            }

            $targetDir = $nas->resolveVideoDir($target);
            $nas->mkdirp("{$targetDir}/tracks");

            foreach ($subdirs as $sub) {
                // Parse "{lang}-{origId}" to recover the language for the new track.
                $lang = 'xx';
                if (preg_match('/^([a-z]{2,10})-\d+$/i', $sub, $m)) {
                    $lang = strtolower($m[1]);
                }

                $this->line("  Adopting track folder: {$sub}  (lang={$lang})");

                if ($dryRun) { $adopted++; continue; }

                $newTrack = VideoAudioTrack::create([
                    'video_id' => $target->id,
                    'language' => $lang,
                    'label'    => "Recovered from merge #{$r->source_id}",
                    'title'    => null,
                    'filename' => 'audio.mp3',
                    'path'     => '',
                ]);
                $newBasename = $nas->trackFolderName($target, $newTrack);
                $oldRel = "{$tracksDir}/{$sub}";
                $newRel = "{$targetDir}/tracks/{$newBasename}";

                $nas->renameNasPath($oldRel, $newRel);

                // Local mirror (if the folder happens to exist locally too).
                $oldLocal = storage_path('app/' . $oldRel);
                $newLocal = storage_path('app/' . $newRel);
                if (is_dir($oldLocal)) {
                    @mkdir(dirname($newLocal), 0755, true);
                    @rename($oldLocal, $newLocal);
                }

                // Detect audio filename from local mirror if present, else default.
                $audioName = 'audio.mp3';
                foreach (['audio.mp3', 'audio.m4a', 'audio.aac', 'audio.ogg', 'audio.wav', 'audio.opus'] as $cand) {
                    if (file_exists("{$newLocal}/{$cand}")) { $audioName = $cand; break; }
                }
                $newTrack->update([
                    'filename' => $audioName,
                    'path'     => "{$newRel}/{$audioName}",
                ]);

                $adopted++;
            }

            // Clean up now-empty source folder.
            if (!$dryRun) {
                $nas->deleteFile($r->source_folder . '/meta.json');
                $nas->deleteFolder($tracksDir);
                $nas->deleteFolder($r->source_folder);
            }
        }

        $this->line('');
        $this->info(($dryRun ? '[dry-run] Would adopt ' : 'Adopted ') . $adopted . ' track folder(s).');
        return self::SUCCESS;
    }
}