<?php

namespace App\Services\Pos;

use App\Mail\DigitalReceiptMail;
use App\Models\PosSale;
use Illuminate\Support\Facades\Log;
use Illuminate\Support\Facades\Mail;
use RuntimeException;

class ReceiptEmailService
{
    /**
     * Email a digital receipt for a sale. Updates customer_email when empty.
     *
     * @return array{ok: bool, message: string}
     */
    public function send(PosSale $sale, string $email): array
    {
        $email = strtolower(trim($email));
        if ($email === '' || ! filter_var($email, FILTER_VALIDATE_EMAIL)) {
            throw new RuntimeException('A valid email address is required.');
        }

        $sale->loadMissing(['lines', 'location']);

        if (! $sale->customer_email) {
            $sale->forceFill(['customer_email' => $email])->save();
        }

        try {
            Mail::to($email)->send(new DigitalReceiptMail($sale));
        } catch (\Throwable $e) {
            Log::warning('pos.receipt_email_failed', [
                'sale_id' => $sale->id,
                'email' => $email,
                'error' => $e->getMessage(),
            ]);

            throw new RuntimeException('Could not send the receipt email. Please try again.');
        }

        return [
            'ok' => true,
            'message' => 'Receipt sent to '.$email,
        ];
    }

    /**
     * Best-effort send after a paid sale when an email is already on the sale.
     */
    public function sendIfPresent(PosSale $sale): bool
    {
        $email = trim((string) ($sale->customer_email ?? ''));
        if ($email === '') {
            return false;
        }

        try {
            $this->send($sale, $email);

            return true;
        } catch (\Throwable $e) {
            Log::info('pos.receipt_email_skipped', [
                'sale_id' => $sale->id,
                'error' => $e->getMessage(),
            ]);

            return false;
        }
    }
}