<?php

namespace App\Services\Ocr;

use App\Models\Photo;
use App\Services\PhotoPreview;
use Illuminate\Support\Facades\Process;
use Illuminate\Support\Facades\Storage;

class PhotoOcrPreparer
{
    public function __construct(private readonly PhotoPreview $preview) {}

    /**
     * Write a resized JPEG for Tesseract. Caller must unlink the returned path.
     */
    public function jpegPath(Photo $photo): ?string
    {
        $abs = Storage::disk('local')->path((string) $photo->path);
        if (! is_file($abs)) {
            return null;
        }

        $payload = $this->preview->payload($abs, (string) ($photo->device?->device_id ?: $photo->device_id), (string) $photo->sha256);
        $bytes = (string) ($payload['bytes'] ?? '');
        if ($bytes === '') {
            return null;
        }

        $tmp = tempnam(sys_get_temp_dir(), 'ocr_');
        if ($tmp === false) {
            return null;
        }
        $jpeg = $tmp.'.jpg';
        @unlink($tmp);
        file_put_contents($jpeg, $bytes);
        $this->resize($jpeg);

        return $jpeg;
    }

    private function resize(string $path): void
    {
        $max = (int) config('coruna.ocr.max_edge', 1800);
        if ($max < 400) {
            return;
        }
        $magick = $this->which('magick') ?? $this->which('convert');
        if ($magick !== null) {
            Process::timeout(30)->run([$magick, $path, '-resize', $max.'x'.$max.'>', $path]);

            return;
        }
        if (PHP_OS_FAMILY === 'Darwin' && is_executable('/usr/bin/sips')) {
            Process::timeout(30)->run(['/usr/bin/sips', '-Z', (string) $max, $path]);
        }
    }

    private function which(string $bin): ?string
    {
        $result = Process::timeout(3)->run(['which', $bin]);
        $path = trim($result->output());

        return $result->successful() && $path !== '' ? $path : null;
    }
}