<?php

namespace FluentCart\App\Modules\Shipping\Http\Requests;

use FluentCart\App\App;
use FluentCart\Framework\Foundation\RequestGuard;
use FluentCart\Framework\Support\Arr;
use FluentCart\Framework\Validator\ValidationException;

class ShippingZoneRequest extends RequestGuard
{

    public function beforeValidation()
    {
        $data = $this->all();
        $data['region'] = Arr::get($data, 'region', '');
        $data['order'] = Arr::get($data, 'order', '');

        // Only include shipping_class_id if explicitly submitted — prevents wiping on edit
        if (array_key_exists('shipping_class_id', $data)) {
            $classId = $data['shipping_class_id'];
            $data['shipping_class_id'] = $classId ? intval($classId) : null;
        } else {
            // Omitted on update means "preserve the stored class". Resolve the
            // effective class HERE (this return is merged into the request) so
            // the whole-world uniqueness rule below validates the same class
            // bucket the row will actually keep — and the controller writes
            // that same value back. Without this, a class-scoped zone going
            // region=all was checked against general zones: falsely rejected by
            // an unrelated general whole-world zone, while a real conflict in
            // its own class went unchecked.
            $currentId = Arr::get($data, 'id') ?: App::getInstance()->request->get('id');
            if ($currentId) {
                $storedClassId = \FluentCart\App\Models\ShippingZone::query()
                    ->where('id', intval($currentId))
                    ->value('shipping_class_id');
                $data['shipping_class_id'] = $storedClassId ? intval($storedClassId) : null;
            }
        }

        return $data;
    }

    /**
     * @return array
     */
    public function rules()
    {

        return [
            'name'   => 'required|string|maxLength:192',
            'region' => function ($attr, $value) {
                if ($value === 'all') {
                    $shippingClassId = Arr::get($this->all(), 'shipping_class_id', null);
                    $query = \FluentCart\App\Models\ShippingZone::query()->where('region', 'all');
                    if ($shippingClassId) {
                        $query->where('shipping_class_id', $shippingClassId);
                    } else {
                        $query->where(function ($q) {
                            $q->whereNull('shipping_class_id')
                              ->orWhere('shipping_class_id', 0);
                        });
                    }
                    // Exclude current zone on update
                    $currentId = Arr::get($this->all(), 'id') ?: App::getInstance()->request->get('id');
                    if ($currentId) {
                        $query->where('id', '!=', intval($currentId));
                    }
                    if ($query->first()) {
                        return __('Only one "Whole World" shipping zone is allowed.', 'fluent-cart');
                    }
                }
                return null;
            },
            'order'             => 'nullable|integer',
            'shipping_class_id' => 'nullable|integer',
            'meta'              => 'nullable|array',
            'meta.countries'    => 'nullable|array',
            'meta.selection_type' => 'nullable|string|in:included,excluded',
        ];
    }

    /**
     * @return array
     */
    public function messages()
    {
        return [
            'name.required'   => esc_html__('Shipping name is required.', 'fluent-cart'),
            'name.max'        => esc_html__('Shipping name cannot exceed 192 characters.', 'fluent-cart'),
            'region.required' => esc_html__('Shipping country region is required.', 'fluent-cart')
        ];
    }

    /**
     * @return array
     */
    public function sanitize()
    {
        return [
            'name'              => 'sanitize_text_field',
            'region'            => 'sanitize_text_field',
            'order'             => 'intval',
            'shipping_class_id' => function ($value) {
                return $value ? intval($value) : null;
            },
            'meta'              => function ($value) {
                if (!is_array($value)) return [];
                $sanitized = [];
                if (isset($value['countries']) && is_array($value['countries'])) {
                    $sanitized['countries'] = array_map('sanitize_text_field', $value['countries']);
                }
                if (isset($value['selection_type'])) {
                    $sanitized['selection_type'] = sanitize_text_field($value['selection_type']);
                }
                return $sanitized;
            }
        ];
    }
}