<?php

namespace App\Http\Controllers\Api\Admin\Invoice\Concerns;

use App\Jobs\Mail\SendInvoiceMailJob;
use App\Mail\InvoiceNotificationMail;
use App\Models\Invoice;
use App\Models\InvoiceAttachment;
use App\Services\InvoiceReminderService;
use App\Support\AutoEmailGate;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Http\Response;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\Queue;

trait SendsInvoiceNotifications
{
    /**
     * Nhắc thanh toán thủ công — dùng khi kế toán muốn thúc riêng một khách mà không chờ
     * mốc tự động trong billing.reminder_offsets.
     */
    public function remind(int $id, InvoiceReminderService $reminders): JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);

        if (!$invoice) {
            return response()->json([
                'error' => true,
                'message' => "Can't find invoice by ID #" . $id
            ], 404);
        }

        if ($disabled = $this->mailDisabledResponse()) {
            return $disabled;
        }

        if (!$reminders->isRemindable($invoice)) {
            return response()->json([
                'error' => true,
                'message' => 'Chỉ nhắc được hoá đơn chưa thanh toán hoặc quá hạn.',
            ], 422);
        }

        try {
            AutoEmailGate::markManual();
            $reminders->remind($invoice->load('customer'), force: true);
        } catch (\Throwable $e) {
            return response()->json([
                'error' => true,
                'message' => 'Không gửi được email nhắc: ' . $e->getMessage(),
            ], 500);
        }

        return response()->json([
            'error' => false,
            'message' => 'Đã gửi email nhắc thanh toán tới ' . $invoice->customer?->email,
        ]);
    }

    public function pdf(Request $request, int $id): Response|JsonResponse
    {
        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $vat = $request->query('variant') === 'vat';
        if ($vat && !$invoice->vat_number) {
            return response()->json(['error' => true, 'message' => 'Hoá đơn chưa được cấp số VAT'], 422);
        }

        $fileName = $vat ? $this->invoicePdfService->vatFileName($invoice) : $this->invoicePdfService->generateFileName($invoice);

        return response($this->invoicePdfService->generate($invoice), 200, [
            'Content-Type' => 'application/pdf',
            'Content-Disposition' => 'inline; filename="' . $fileName . '"',
        ]);
    }

    public function previewMail(Request $request, int $id): JsonResponse
    {
        $invoice = $this->invoiceForMail($request, $id);
        if ($invoice instanceof JsonResponse) {
            return $invoice;
        }

        $mail = InvoiceNotificationMail::forInvoice($invoice, $request->input('type') ?: 'invoice', $request->input('message'));

        return response()->json([
            'error' => false,
            'data'  => [
                'to'                  => $invoice->customer->email,
                'subject'             => $mail->envelope()->subject,
                'html'                => $mail->render(),
                'attachment_filename' => $this->invoicePdfService->generateFileName($invoice),
                'vat_attachment_filename' => $invoice->vat_number ? $this->invoicePdfService->vatFileName($invoice) : null,
                'contracts' => $this->contractsOf($invoice)->map(fn (InvoiceAttachment $file) => ['id' => $file->id, 'filename' => $file->filename])->values(),
            ],
        ]);
    }

    public function sendMail(Request $request, int $id): JsonResponse
    {
        if ($disabled = $this->mailDisabledResponse()) {
            return $disabled;
        }

        $invoice = $this->invoiceForMail($request, $id);
        if ($invoice instanceof JsonResponse) {
            return $invoice;
        }

        AutoEmailGate::markManual();
        $jobId = Queue::push(new SendInvoiceMailJob(
            $invoice->id,
            $request->input('type') ?: 'invoice',
            $request->input('message'),
            $request->input('subject'),
            $request->filled('html') ? $request->input('html') : null,
            Auth::guard('admin')->id(),
            $request->boolean('attach_vat'),
            $this->contractsOf($invoice)->whereIn('id', (array) $request->input('contract_ids', []))->pluck('id')->all(),
        ));

        return response()->json([
            'error'   => false,
            'message' => "Đã đưa email vào hàng đợi gửi tới {$invoice->customer->email}",
            'data'    => ['job_id' => $jobId],
        ]);
    }

    private function mailDisabledResponse(): ?JsonResponse
    {
        return AutoEmailGate::mailEnabled() ? null : response()->json([
            'error'   => true,
            'message' => 'Chức năng gửi email đang tắt. Bật lại tại Cài đặt → Thông báo.',
        ], 422);
    }

    private function invoiceForMail(Request $request, int $id): Invoice|JsonResponse
    {
        $request->validate([
            'message' => 'nullable|string|max:1000',
            'type'    => 'nullable|string|in:invoice,renewal',
            'subject' => 'nullable|required_with:html|string|max:255',
            'html'    => 'nullable|required_with:subject|string|max:500000',
            'attach_vat' => 'nullable|boolean',
            'contract_ids' => 'nullable|array|max:10',
            'contract_ids.*' => 'integer',
        ]);

        $invoice = $this->invoiceRepository->find($id);
        if (!$invoice) {
            return response()->json(['error' => true, 'message' => "Can't find invoice #$id"], 404);
        }

        $invoice->load('customer');
        if (!$invoice->customer?->email) {
            return response()->json(['error' => true, 'message' => 'Customer email not found'], 422);
        }

        if ($request->boolean('attach_vat') && !$invoice->vat_number) {
            return response()->json(['error' => true, 'message' => 'Hoá đơn chưa được cấp số VAT, không thể đính kèm hoá đơn VAT'], 422);
        }

        return $invoice;
    }

    private function contractsOf(Invoice $invoice)
    {
        return InvoiceAttachment::query()
            ->where('invoice_id', $invoice->id)
            ->where('type', InvoiceAttachment::TYPE_CONTRACT)
            ->get();
    }
}