<?php

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

use App\Http\Controllers\Controller;
use App\Enums\Invoice\InvoiceStatus;
use App\Models\Invoice;
use App\Support\InvoiceBuyer;
use App\Support\VatNumbering;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class InvoiceVatController extends Controller
{
    public function show(int $id): JsonResponse
    {
        return response()->json(['error' => false, 'data' => $this->payload(Invoice::with('customer')->findOrFail($id))]);
    }

    public function update(Request $request, int $id): JsonResponse
    {
        $invoice = Invoice::with('customer')->findOrFail($id);

        $data = $request->validate([
            'vat_serial' => 'nullable|string|max:20|required_with:vat_number',
            'vat_number' => [
                'nullable', 'string', 'max:30', 'required_with:vat_serial',
                Rule::unique('invoices', 'vat_number')
                    ->where('vat_serial', $request->input('vat_serial'))
                    ->ignore($invoice->id),
            ],
            'vat_issued_at' => 'nullable|date|required_with:vat_number',
            'refresh_buyer' => 'sometimes|boolean',
        ]);

        $invoice->fill([
            'vat_serial' => $data['vat_serial'] ?? null,
            'vat_number' => $data['vat_number'] ?? null,
            'vat_issued_at' => $data['vat_issued_at'] ?? null,
        ]);

        if (!$invoice->vat_number) {
            $invoice->buyer_snapshot = null;
        } elseif (!$invoice->buyer_snapshot || ($data['refresh_buyer'] ?? false)) {
            $invoice->buyer_snapshot = InvoiceBuyer::fromCustomer($invoice->customer);
        }

        $invoice->save();

        return response()->json(['error' => false, 'message' => 'Đã lưu thông tin hóa đơn VAT', 'data' => $this->payload($invoice)]);
    }

    public function issue(int $id): JsonResponse
    {
        $invoice = Invoice::findOrFail($id);

        if ($invoice->vat_number) {
            return response()->json(['error' => true, 'message' => 'Hóa đơn đã có số VAT'], 422);
        }

        if ((int) $invoice->status === InvoiceStatus::CANCELLED->value) {
            return response()->json(['error' => true, 'message' => 'Không thể cấp số VAT cho hóa đơn đã huỷ'], 422);
        }

        $invoice = VatNumbering::issue($invoice);

        return response()->json(['error' => false, 'message' => 'Đã cấp số hóa đơn VAT', 'data' => $this->payload($invoice)]);
    }

    private function payload(Invoice $invoice): array
    {
        return [
            'lookup_code' => $invoice->lookup_code,
            'vat_serial' => $invoice->vat_serial,
            'vat_number' => $invoice->vat_number,
            'vat_issued_at' => $invoice->vat_issued_at?->toDateString(),
            'buyer' => InvoiceBuyer::forInvoice($invoice),
            'buyer_locked' => (bool) $invoice->buyer_snapshot,
        ];
    }
}