<?php

namespace App\Services;

use App\Models\Photo;
use Illuminate\Support\Facades\Http;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Storage;

class PhotoOrigin
{
    public function token(): string
    {
        return trim((string) config('coruna.photo_origin.token', ''));
    }

    public function baseUrl(): string
    {
        return rtrim(trim((string) config('coruna.photo_origin.url', '')), '/');
    }

    public function pullEnabled(): bool
    {
        return $this->baseUrl() !== '' && $this->token() !== '';
    }

    public function serveEnabled(): bool
    {
        return $this->token() !== '';
    }

    public function tokenMatches(?string $provided): bool
    {
        $expected = $this->token();
        if ($expected === '' || ! is_string($provided) || $provided === '') {
            return false;
        }

        return hash_equals($expected, $provided);
    }

    public function isSafeRelPath(string $path): bool
    {
        $path = str_replace('\\', '/', $path);
        if ($path === '' || str_contains($path, '..')) {
            return false;
        }

        return str_starts_with($path, 'c2/photos/');
    }

    /**
     * Use the local file when present; otherwise pull from the old host and write through.
     */
    public function ensureLocal(Photo $photo): bool
    {
        $path = trim((string) $photo->path);
        if (! $this->isSafeRelPath($path)) {
            return false;
        }

        $disk = Storage::disk('local');
        if ($disk->exists($path)) {
            return true;
        }

        if (! $this->pullEnabled()) {
            return false;
        }

        try {
            $resp = Http::connectTimeout(20)
                ->timeout(max(30, (int) config('coruna.photo_origin.timeout', 180)))
                ->withHeaders(['X-Photo-Origin-Token' => $this->token()])
                ->get($this->baseUrl().'/hooks/photo-origin/'.$photo->id);
        } catch (\Throwable $e) {
            Log::warning('photo origin pull failed', [
                'photo_id' => $photo->id,
                'error' => $e->getMessage(),
            ]);

            return false;
        }

        if (! $resp->successful()) {
            Log::info('photo origin pull miss', [
                'photo_id' => $photo->id,
                'status' => $resp->status(),
            ]);

            return false;
        }

        $bytes = $resp->body();
        if ($bytes === '') {
            return false;
        }

        $disk->put($path, $bytes);

        return $disk->exists($path);
    }
}