<?php

namespace App\Console\Commands;

use App\Models\Invoice;
use App\Services\InvoicePaymentService;
use App\Services\InvoiceReminderService;
use Illuminate\Console\Command;
use Illuminate\Support\Facades\Log;

class SendInvoiceReminders extends Command
{
    protected $signature = 'invoices:send-reminders {--dry-run : Preview which invoices would be reminded}';
    protected $description = 'Send payment reminders for invoices approaching or past their due date.';

    public function handle(InvoiceReminderService $reminders): int
    {
        $dryRun = (bool) $this->option('dry-run');
        $offsets = (array) config('billing.reminder_offsets', []);

        if ($offsets === []) {
            $this->warn('invoices:send-reminders | billing.reminder_offsets rỗng — không có mốc nào để nhắc.');
            return Command::SUCCESS;
        }

        // Chỉ quét hoá đơn nằm trong cửa sổ nhắc [mốc sớm nhất … mốc muộn nhất], để không
        // kéo cả bảng và không đụng vào hoá đơn cũ đã qua mốc cuối (vd. dữ liệu import từ WHMCS).
        $earliest = min($offsets);
        $latest = InvoiceReminderService::reminderCutoff($offsets);

        $invoices = Invoice::query()
            ->with('customer')
            ->whereNotNull('due_date')
            ->whereIn('status', InvoicePaymentService::PAYABLE_STATUSES)
            ->whereDate('due_date', '<=', now()->subDays($earliest)->toDateString())
            ->whereDate('due_date', '>=', now()->subDays($latest)->toDateString())
            ->get();

        $this->info("invoices:send-reminders | Xét {$invoices->count()} hoá đơn.");

        $sent = 0;

        foreach ($invoices as $invoice) {
            $dueStep = $reminders->dueStep($invoice);

            if ($dueStep <= (int) $invoice->reminder_step) {
                continue;
            }

            if ($dryRun) {
                $this->line(sprintf(
                    '  [dry-run] Hoá đơn #%s hạn %s — mốc %d/%d',
                    $invoice->invoice_number,
                    $invoice->due_date->format('Y-m-d'),
                    $dueStep,
                    count($offsets),
                ));
                continue;
            }

            try {
                if ($reminders->remind($invoice)) {
                    $sent++;
                    $this->line("  [sent] Hoá đơn #{$invoice->invoice_number} → {$invoice->customer?->email}");
                }
            } catch (\Throwable $e) {
                Log::error('invoices:send-reminders error', [
                    'invoice_id' => $invoice->id,
                    'error' => $e->getMessage(),
                ]);
                $this->error("  [error] Hoá đơn #{$invoice->invoice_number}: " . $e->getMessage());
            }
        }

        $this->info("invoices:send-reminders | Đã gửi {$sent} email nhắc.");

        return Command::SUCCESS;
    }
}