<?php

namespace App\Services;

use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class SiteAssetSyncService
{
    /**
     * Copy a file from Laravel's public disk into usher-site/public so Next.js can serve it as a static asset.
     *
     * Returns the relative path under Next.js public/ (no leading slash), e.g. "uploads/articles/images/foo.jpg".
     * If the Next.js public path is not configured / not present, returns null and callers should fall back
     * to serving from Laravel storage.
     */
    public static function syncPublicDiskFileToNext(string $publicDiskPath): ?string
    {
        $publicDiskPath = ltrim($publicDiskPath, '/');

        $nextPublicRoot = static::resolveNextPublicRoot();
        if (! $nextPublicRoot) {
            return null;
        }

        $source = Storage::disk('public')->path($publicDiskPath);
        if (! is_file($source)) {
            Log::warning("Site asset sync skipped (source missing): {$publicDiskPath}");

            return null;
        }

        $prefix = config('services.nextjs.public_upload_prefix', 'uploads');
        $prefix = trim((string) $prefix, '/');
        if ($prefix === '') {
            $prefix = 'uploads';
        }

        $relativeDest = $prefix.'/'.$publicDiskPath;
        $dest = rtrim($nextPublicRoot, '/').'/'.$relativeDest;

        $destDir = dirname($dest);
        if (! is_dir($destDir) && ! @mkdir($destDir, 0755, true) && ! is_dir($destDir)) {
            Log::warning("Site asset sync failed (mkdir): {$destDir}");

            return null;
        }

        if (! @copy($source, $dest)) {
            Log::warning("Site asset sync failed (copy): {$publicDiskPath} -> {$dest}");

            return null;
        }

        // Optionally commit+push the updated assets into the usher-site repo.
        NextjsRepoSyncService::scheduleAssetsPush();

        return $relativeDest;
    }

    /**
     * Delete a previously synced Next.js public asset (best-effort).
     */
    public static function deleteNextPublicFile(?string $nextPublicRelativePath): void
    {
        if (! $nextPublicRelativePath) {
            return;
        }

        $nextPublicRoot = static::resolveNextPublicRoot();
        if (! $nextPublicRoot) {
            return;
        }

        $rel = ltrim($nextPublicRelativePath, '/');
        $path = rtrim($nextPublicRoot, '/').'/'.$rel;

        if (is_file($path)) {
            @unlink($path);
        }

        // Stage deletion via scheduled push (best-effort).
        NextjsRepoSyncService::scheduleAssetsPush();
    }

    private static function resolveNextPublicRoot(): ?string
    {
        $configured = config('services.nextjs.public_path');
        if (is_string($configured) && $configured !== '' && is_dir($configured)) {
            return $configured;
        }

        // Local-dev default: sibling repo next to this Laravel repo.
        $guess = base_path('../usher-site/public');
        if (is_dir($guess)) {
            return $guess;
        }

        return null;
    }
}