topnotch_website/app/Models/Customer.php

<?php

namespace App\Models;

use Database\Factories\CustomerFactory;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Database\Eloquent\SoftDeletes;

class Customer extends Model
{
    /** @use HasFactory<CustomerFactory> */
    use HasFactory, SoftDeletes;

    protected $fillable = [
        'company_name',
        'internal_name',
        'shipping_address',
        'billing_address',
        'phone',
    ];

    protected $appends = [
        'subtotal',
        'gst',
        'pst',
        'total',
    ];

    public function getSubtotalAttribute($created_at = null, $created_until = null): float
    {
        return $this->invoices()
            ->when($created_at, fn ($query) => $query->whereDate('created_at', '>=', $created_at))
            ->when($created_until, fn ($query) => $query->whereDate('created_at', '<=', $created_until))
            ->sum('subtotal');
    }

    public function getGstAttribute($created_at = null, $created_until = null): float
    {
        return $this->invoices()
            ->when($created_at, fn ($query) => $query->whereDate('created_at', '>=', $created_at))
            ->when($created_until, fn ($query) => $query->whereDate('created_at', '<=', $created_until))
            ->sum('total') * 0.05;
    }

    public function getPstAttribute($created_at = null, $created_until = null): float
    {
        return $this->invoices()
            ->when($created_at, fn ($query) => $query->whereDate('created_at', '>=', $created_at))
            ->when($created_until, fn ($query) => $query->whereDate('created_at', '<=', $created_until))
            ->where('pst', true)
            ->sum('total') * 0.07;
    }

    public function getTotalAttribute($created_at = null, $created_until = null): float
    {
        return $this->invoices()
            ->when($created_at, fn ($query) => $query->whereDate('created_at', '>=', $created_at))
            ->when($created_until, fn ($query) => $query->whereDate('created_at', '<=', $created_until))
            ->sum('total');
    }

    /**
     * @return HasMany<Contact>
     */
    public function contacts(): HasMany
    {
        return $this->hasMany(Contact::class);
    }

    /**
     * @return HasMany<PackingSlip>
     */
    public function packingSlips(): HasMany
    {
        return $this->hasMany(PackingSlip::class);
    }

    /**
     * @return HasMany<ShippingEntry>
     */
    public function shippingEntries(): HasMany
    {
        return $this->hasMany(ShippingEntry::class);
    }

    /**
     * @return HasMany<Order>
     */
    public function orders(): HasMany
    {
        return $this->hasMany(Order::class);
    }

    public function invoices(): HasMany
    {
        return $this->hasMany(Invoice::class);
    }
}