<?php

namespace App\Support\Events;

use App\Models\QrCode;
use Illuminate\Support\Collection;

/**
 * Generates ZPL II label code for Zebra-style badge/label printers.
 * One ^XA…^XZ label block per attendee, sized to the chosen badge size at 203 dpi.
 */
class EventBadgeZpl
{
    /** @param  Collection<int, \App\Models\QrEventRegistration>  $registrations */
    public static function forRegistrations(QrCode $qrCode, Collection $registrations): string
    {
        $content = $qrCode->content();
        $eventName = self::sanitize($content['name'] ?? $qrCode->label);
        $size = $content['badge_size'] ?? '4x3';

        // Label dimensions in dots @ 203 dpi.
        [$widthDots, $heightDots] = match ($size) {
            '4x6'  => [812, 1218],
            'cr80' => [685, 431],
            default => [812, 609], // 4x3
        };

        $labels = [];
        foreach ($registrations as $reg) {
            $name = self::sanitize($reg->attendee_name);
            $tier = self::sanitize($reg->tier_name);
            $extra = collect($reg->badge_fields ?? [])
                ->map(fn ($v, $k) => self::sanitize($k . ': ' . $v))
                ->implode('  |  ');

            $zpl = "^XA\n";
            $zpl .= "^PW{$widthDots}\n";
            $zpl .= "^LL{$heightDots}\n";
            $zpl .= "^CI28\n"; // UTF-8
            // Event name (top)
            $zpl .= "^FO40,40^A0N,40,40^FB" . ($widthDots - 80) . ",1,0,C^FD{$eventName}^FS\n";
            // Attendee name (large, centered)
            $zpl .= "^FO40,150^A0N,80,80^FB" . ($widthDots - 80) . ",2,0,C^FD{$name}^FS\n";
            // Tier
            $zpl .= "^FO40,320^A0N,40,40^FB" . ($widthDots - 80) . ",1,0,C^FD{$tier}^FS\n";
            // Extra fields
            if ($extra !== '') {
                $zpl .= "^FO40,375^A0N,28,28^FB" . ($widthDots - 80) . ",2,0,C^FD{$extra}^FS\n";
            }
            // QR of the badge code (bottom)
            $qrX = (int) (($widthDots / 2) - 70);
            $zpl .= "^FO{$qrX}," . ($heightDots - 200) . "^BQN,2,5^FDLA,{$reg->badge_code}^FS\n";
            // Badge code text
            $zpl .= "^FO40," . ($heightDots - 60) . "^A0N,34,34^FB" . ($widthDots - 80) . ",1,0,C^FD{$reg->badge_code}^FS\n";
            $zpl .= "^XZ\n";

            $labels[] = $zpl;
        }

        return implode("\n", $labels);
    }

    private static function sanitize(string $value): string
    {
        // Escape ZPL control chars (^ and ~) and collapse whitespace.
        $value = str_replace(['^', '~'], [' ', ' '], $value);

        return trim(preg_replace('/\s+/', ' ', $value) ?? '');
    }
}