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Modules/Tax/Entities/TaxClass.php

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+<?php
+
+namespace Modules\Tax\Entities;
+
+use Modules\Admin\Ui\AdminTable;
+use Modules\Support\Eloquent\Model;
+use Illuminate\Support\Facades\Cache;
+use Modules\Product\Entities\Product;
+use Modules\Support\Eloquent\Translatable;
+use Illuminate\Database\Eloquent\SoftDeletes;
+
+class TaxClass extends Model
+{
+    use Translatable, SoftDeletes;
+
+    const SHIPPING_ADDRESS = 'shipping_address';
+    const BILLING_ADDRESS = 'billing_address';
+    const STORE_ADDRESS = 'store_address';
+
+    /**
+     * The relations to eager load on every query.
+     *
+     * @var array
+     */
+    protected $with = ['translations'];
+
+    /**
+     * The attributes that are mass assignable.
+     *
+     * @var array
+     */
+    protected $fillable = ['based_on'];
+
+    /**
+     * The attributes that should be mutated to dates.
+     *
+     * @var array
+     */
+    protected $dates = ['start_date', 'end_date', 'deleted_at'];
+
+    /**
+     * The attributes that are translatable.
+     *
+     * @var array
+     */
+    public $translatedAttributes = ['label'];
+
+    /**
+     * Perform any actions required after the model boots.
+     *
+     * @return void
+     */
+    protected static function booted()
+    {
+        static::saved(function ($taxClass) {
+            $taxClass->saveRates(request('rates', []));
+        });
+    }
+
+    /**
+     * Get tag list.
+     *
+     * @return \Illuminate\Database\Eloquent\Collection
+     */
+    public static function list()
+    {
+        return Cache::tags('tax_classes')->rememberForever(md5('tax_classes.list:' . locale()), function () {
+            return self::all()->sortBy('label')->pluck('label', 'id');
+        });
+    }
+
+    public function findTaxRate($addresses)
+    {
+        return $this->taxRates()
+            ->findByAddress($this->determineAddress($addresses))
+            ->first();
+    }
+
+    public function determineAddress($addresses)
+    {
+        if ($this->based_on === self::SHIPPING_ADDRESS) {
+            return $addresses['shipping'] ?? [];
+        }
+
+        if ($this->based_on === self::BILLING_ADDRESS) {
+            return $addresses['billing'] ?? [];
+        }
+
+        if ($this->based_on === self::STORE_ADDRESS) {
+            return [
+                'address_1' => setting('store_address_1'),
+                'address_2' => setting('store_address_2'),
+                'city' => setting('store_city'),
+                'state' => setting('store_state'),
+                'zip' => setting('store_zip'),
+                'country' => setting('store_country'),
+            ];
+        }
+
+        return [];
+    }
+
+    public function taxRates()
+    {
+        return $this->hasMany(TaxRate::class)->orderBy('position');
+    }
+
+    public function products()
+    {
+        return $this->hasMany(Product::class);
+    }
+
+    public function table()
+    {
+        return new AdminTable($this->newQuery());
+    }
+
+    public function saveRates($rates = [])
+    {
+        $ids = $this->getDeleteCandidates($rates);
+
+        if ($ids->isNotEmpty()) {
+            $this->taxRates()->whereIn('id', $ids)->delete();
+        }
+
+        foreach (array_reset_index($rates) as $index => $rate) {
+            $this->taxRates()->updateOrCreate(
+                ['id' => $rate['id']],
+                $rate + ['position' => $index]
+            );
+        }
+    }
+
+    private function getDeleteCandidates($rates = [])
+    {
+        return $this->taxRates()
+            ->pluck('id')
+            ->diff(array_pluck($rates, 'id'));
+    }
+}