<?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 Illuminate\Contracts\Pagination\LengthAwarePaginator;

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

    // -------------------------------------------------------------------------
    // getInvoice
    // -------------------------------------------------------------------------

    public function getInvoice(int $limit = 10, int $customerId = 0): LengthAwarePaginator
    {
        return $this->model
            ->where('customer_id', $customerId)
            ->orderByDesc('created_at')
            ->paginate($limit);
    }

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

    public function createFromOrder(Order $order): Invoice
    {
        $maxMonths = $order->orderItems->max(fn($item) => $this->cycleToMonths($item->billing_cycle)) ?? 1;

        $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'       => $order->total,
            'discount_amount' => $order->discount_amount ?? 0,
            'tax'             => 0,
            'total'           => $order->total,
            'status'          => InvoiceStatus::UNPAID->value,
            'due_date'        => now()->addMonths($maxMonths)->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'      => $this->cycleToMonths($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'      => $this->cycleToMonths($item->billing_cycle),
                    'quantity'    => $qty,
                    'unit_price'  => $price,
                    'total_price' => $subtotal,
                ]);
            }
        }

        return $invoice;
    }

    // -------------------------------------------------------------------------
    // Helpers
    // -------------------------------------------------------------------------

    private function cycleToMonths(?string $cycle): int
    {
        return match ($cycle) {
            'monthly'       => 1,
            'quarterly'     => 3,
            'semi_annually' => 6,
            'annually'      => 12,
            'biennially'    => 24,
            'triennially'   => 36,
            default         => 1,
        };
    }
}