<?php

namespace Webkul\BagistoApi\Transformers;

use Illuminate\Http\Resources\Json\JsonResource;
use Webkul\Sales\Transformers\OrderItemResource;
use Webkul\Sales\Transformers\OrderPaymentResource;

/**
 * Express-checkout flavoured replacement for
 * \Webkul\Sales\Transformers\OrderResource.
 *
 * Two key deviations vs. the stock resource:
 *
 * - shipping_amount / tax_amount are forced to 0 because the buyer
 *   pays only the subtotal at checkout (the real shipping/tax can be
 *   reconciled after the gateway returns the verified address).
 * - billing/shipping address blocks are filled from the placeholder
 *   defined in config('bagistoapi.express_checkout.placeholder_address')
 *   so OrderRepository::create() never trips on null addresses.
 */
class ExpressOrderResource extends JsonResource
{
    public $preserveKeys = true;

    /**
     * @param  \Illuminate\Http\Request  $request
     */
    public function toArray($request): array
    {
        $placeholder = $this->buildPlaceholderAddress();
        $billing = $this->resolveBillingAddress($placeholder);
        $shipping = $this->resolveShippingAddress($billing);

        $subTotal = (float) ($this->sub_total ?? 0);
        $baseSubTotal = (float) ($this->base_sub_total ?? $subTotal);
        $discount = (float) ($this->discount_amount ?? 0);
        $baseDiscount = (float) ($this->base_discount_amount ?? $discount);
        $grandTotal = max(0, $subTotal - $discount);
        $baseGrandTotal = max(0, $baseSubTotal - $baseDiscount);

        return [
            'cart_id'                  => $this->id,
            'is_guest'                 => $this->is_guest,
            'customer_id'              => $this->customer_id,
            'customer_type'            => $this->customer ? get_class($this->customer) : null,
            'customer_email'           => $this->customer_email ?? $placeholder['email'],
            'customer_first_name'      => $this->customer_first_name ?? $placeholder['first_name'],
            'customer_last_name'       => $this->customer_last_name ?? $placeholder['last_name'],
            'channel_id'               => $this->channel_id,
            'channel_name'             => $this->channel->name,
            'channel_type'             => get_class($this->channel),
            'total_item_count'         => $this->items_count,
            'total_qty_ordered'        => $this->items_qty,
            'base_currency_code'       => $this->base_currency_code,
            'channel_currency_code'    => $this->channel_currency_code,
            'order_currency_code'      => $this->cart_currency_code,
            'grand_total'              => $grandTotal,
            'base_grand_total'         => $baseGrandTotal,
            'sub_total'                => $subTotal,
            'sub_total_incl_tax'       => $subTotal,
            'base_sub_total'           => $baseSubTotal,
            'base_sub_total_incl_tax'  => $baseSubTotal,
            'tax_amount'               => 0,
            'base_tax_amount'          => 0,
            'shipping_tax_amount'      => 0,
            'base_shipping_tax_amount' => 0,
            'coupon_code'              => $this->coupon_code,
            'applied_cart_rule_ids'    => $this->applied_cart_rule_ids,
            'discount_amount'          => $discount,
            'base_discount_amount'     => $baseDiscount,
            'billing_address'          => $billing,
            'shipping_address'         => $shipping,
            'payment'                  => (new OrderPaymentResource($this->payment))->jsonSerialize(),
            'items'                    => OrderItemResource::collection($this->items)->jsonSerialize(),
        ];
    }

    /**
     * Pull the configured placeholder block and guarantee every key exists.
     */
    private function buildPlaceholderAddress(): array
    {
        $defaults = [
            'first_name'   => 'Express',
            'last_name'    => 'Checkout',
            'email'        => 'express-checkout@placeholder.local',
            'address'      => 'Pending gateway response',
            'city'         => 'Pending',
            'state'        => 'Pending',
            'country'      => 'US',
            'postcode'     => '00000',
            'phone'        => '0000000000',
        ];

        $configured = (array) config('bagistoapi.express_checkout.placeholder_address', []);

        return array_merge($defaults, $configured);
    }

    /**
     * Prefer an existing billing address attached to the cart, otherwise
     * use the placeholder so OrderRepository can persist the order.
     */
    private function resolveBillingAddress(array $placeholder): array
    {
        if ($this->billing_address) {
            return [
                'address_type' => 'order_billing',
                'first_name'   => $this->billing_address->first_name ?: $placeholder['first_name'],
                'last_name'    => $this->billing_address->last_name ?: $placeholder['last_name'],
                'gender'       => $this->billing_address->gender,
                'company_name' => $this->billing_address->company_name,
                'address'      => $this->billing_address->address ?: $placeholder['address'],
                'city'         => $this->billing_address->city ?: $placeholder['city'],
                'state'        => $this->billing_address->state ?: $placeholder['state'],
                'country'      => $this->billing_address->country ?: $placeholder['country'],
                'postcode'     => $this->billing_address->postcode ?: $placeholder['postcode'],
                'email'        => $this->billing_address->email ?: $this->customer_email ?: $placeholder['email'],
                'phone'        => $this->billing_address->phone ?: $placeholder['phone'],
                'vat_id'       => $this->billing_address->vat_id,
            ];
        }

        return [
            'address_type' => 'order_billing',
            'first_name'   => $placeholder['first_name'],
            'last_name'    => $placeholder['last_name'],
            'gender'       => null,
            'company_name' => null,
            'address'      => $placeholder['address'],
            'city'         => $placeholder['city'],
            'state'        => $placeholder['state'],
            'country'      => $placeholder['country'],
            'postcode'     => $placeholder['postcode'],
            'email'        => $this->customer_email ?: $placeholder['email'],
            'phone'        => $placeholder['phone'],
            'vat_id'       => null,
        ];
    }

    /**
     * Mirror the billing block into shipping when the cart has stockable
     * items; downloadable-only carts skip the shipping address entirely.
     */
    private function resolveShippingAddress(array $billing): ?array
    {
        if (! $this->haveStockableItems()) {
            return null;
        }

        if ($this->shipping_address) {
            return [
                'address_type' => 'order_shipping',
                'first_name'   => $this->shipping_address->first_name ?: $billing['first_name'],
                'last_name'    => $this->shipping_address->last_name ?: $billing['last_name'],
                'gender'       => $this->shipping_address->gender,
                'company_name' => $this->shipping_address->company_name,
                'address'      => $this->shipping_address->address ?: $billing['address'],
                'city'         => $this->shipping_address->city ?: $billing['city'],
                'state'        => $this->shipping_address->state ?: $billing['state'],
                'country'      => $this->shipping_address->country ?: $billing['country'],
                'postcode'     => $this->shipping_address->postcode ?: $billing['postcode'],
                'email'        => $this->shipping_address->email ?: $billing['email'],
                'phone'        => $this->shipping_address->phone ?: $billing['phone'],
                'vat_id'       => $this->shipping_address->vat_id,
            ];
        }

        return array_merge($billing, ['address_type' => 'order_shipping']);
    }
}