<?php

namespace App\Support\AssetStorage;

use App\Models\Asset;
use App\Models\VideoProject;
use App\Models\WorkflowStep;
use Illuminate\Support\Facades\Storage;

/**
 * Stores generated content (scripts, images, video, audio) on disk and
 * records it as an Asset. Versioned per (project, type[, step]) slot —
 * storing again for the same slot doesn't overwrite, it adds the next
 * version, so a rejected/retried step's earlier output stays around.
 */
class AssetStorage
{
    /**
     * @param  array<string, mixed>  $metadata
     */
    public function store(
        VideoProject $project,
        string $type,
        string $contents,
        string $extension,
        ?WorkflowStep $step = null,
        ?string $mimeType = null,
        array $metadata = [],
    ): Asset {
        $version = $this->nextVersion($project, $type, $step);
        $path = "video-projects/{$project->id}/{$type}/v{$version}.".ltrim($extension, '.');

        Storage::put($path, $contents);

        return $project->assets()->create([
            'workflow_step_id' => $step?->id,
            'type' => $type,
            'disk_path' => $path,
            'mime_type' => $mimeType,
            'size_bytes' => strlen($contents),
            'version' => $version,
            'metadata' => $metadata,
        ]);
    }

    public function nextVersion(VideoProject $project, string $type, ?WorkflowStep $step = null): int
    {
        $query = $project->assets()->where('type', $type);

        if ($step) {
            $query->where('workflow_step_id', $step->id);
        }

        return ((int) $query->max('version')) + 1;
    }

    public function contents(Asset $asset): string
    {
        return Storage::get($asset->disk_path);
    }

    /**
     * A URL to view/download this asset. Not Storage::url() — the default
     * 'local' disk has no configured URL driver and throws if asked for
     * one, so this goes through the authenticated streaming route instead.
     */
    public function url(Asset $asset): ?string
    {
        return Storage::exists($asset->disk_path)
            ? route('video-projects.assets.show', [$asset->video_project_id, $asset->id])
            : null;
    }

    public function delete(Asset $asset): void
    {
        Storage::delete($asset->disk_path);
        $asset->delete();
    }

    /**
     * Keep only the newest $keep versions for a (project, type[, step])
     * slot; delete the file + record for the rest. Returns how many were
     * pruned.
     */
    public function pruneOldVersions(VideoProject $project, string $type, ?WorkflowStep $step = null, int $keep = 3): int
    {
        $query = $project->assets()->where('type', $type);

        if ($step) {
            $query->where('workflow_step_id', $step->id);
        }

        $stale = $query->orderByDesc('version')->get()->slice($keep);

        foreach ($stale as $asset) {
            $this->delete($asset);
        }

        return $stale->count();
    }
}