<?php

namespace App\Repositories\Api\Invoice;

use App\Enums\Invoice\InvoiceStatus;
use App\Helpers\OrderHelper;
use App\Models\Invoice;
use App\Models\InvoiceItem;
use App\Models\Order;
use App\Repositories\Api\BaseApiRepository;
use App\Support\VatNumbering;

class InvoiceRepository extends BaseApiRepository implements InvoiceRepositoryInterface
{
    public function getModel(): string
    {
        return Invoice::class;
    }

    // -------------------------------------------------------------------------
    // createFromOrder
    // -------------------------------------------------------------------------

    public function createFromOrder(Order $order, ?int $dueDays = null): Invoice
    {
        $discount = (int) ($order->discount_amount ?? 0);

        // due_date là HẠN THANH TOÁN, không phải ngày hết hạn dịch vụ — mốc dịch vụ đã có
        // billing_period_end và services.expires_at lo. Cho phép truyền dueDays để admin gia hạn
        // hạn thanh toán riêng cho một số khách.
        $dueDays = $dueDays ?? (int) config('billing.invoice_due_days', 30);

        $invoice = $this->model->create([
            'invoice_number' => OrderHelper::generateOrderNumber('INV'),
            'customer_id'     => $order->customer_id,
            'order_id'        => $order->id,
            'invoice_type'    => 1, // new service
            // sub_total là tổng TRƯỚC giảm giá, để sub_total - discount_amount = total.
            'sub_total'       => (int) $order->total + $discount,
            'discount_amount' => $discount,
            'coupon_code'     => $order->coupon_code,
            'tax'             => 0,
            'total'           => $order->total,
            'status'          => InvoiceStatus::UNPAID->value,
            'due_date'        => now()->addDays($dueDays)->toDateString(),
        ]);

        // Create one invoice_item per order_item line + addon sub-lines
        foreach ($order->orderItems as $item) {
            InvoiceItem::create([
                'invoice_id'  => $invoice->id,
                'product_id'  => $item->product_id,
                'type'        => 'service',
                'description' => $item->product?->name ?? 'Dịch vụ',
                'months'      => OrderHelper::cycleToMonths($item->billing_cycle),
                'quantity'    => $item->quantity ?? 1,
                'unit_price'  => $item->price,
                'total_price' => $item->price * ($item->quantity ?? 1),
            ]);

            $addonsMeta = is_array($item->addons_meta) ? $item->addons_meta : [];
            foreach ($addonsMeta as $meta) {
                $qty      = (int) ($meta['qty'] ?? 1);
                $price    = (int) ($meta['price'] ?? 0);
                $subtotal = (int) ($meta['subtotal'] ?? $price * $qty);
                $name     = $meta['name'] ?? ('Addon #' . ($meta['addon_id'] ?? '?'));
                $code     = strtoupper($meta['code'] ?? '');
                $label    = $code ? "[{$code}] {$name}" : $name;

                InvoiceItem::create([
                    'invoice_id'  => $invoice->id,
                    'product_id'  => $item->product_id,
                    'type'        => 'addon',
                    'description' => $label,
                    'months'      => OrderHelper::cycleToMonths($item->billing_cycle),
                    'quantity'    => $qty,
                    'unit_price'  => $price,
                    'total_price' => $subtotal,
                ]);
            }
        }

        return VatNumbering::settle($invoice);
    }

    // -------------------------------------------------------------------------
    // Helpers
    // -------------------------------------------------------------------------
}