Add all files

app/Models/Invoice.php

@@ -0,0 +1,102 @@
+<?php
+
+namespace App\Models;
+
+use App\Classes\PDF;
+use App\Classes\Price;
+use App\Observers\InvoiceObserver;
+use Illuminate\Database\Eloquent\Attributes\ObservedBy;
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+#[ObservedBy([InvoiceObserver::class])]
+class Invoice extends Model
+{
+    use HasFactory;
+
+    public const STATUS_PENDING = 'pending';
+
+    public const STATUS_PAID = 'paid';
+
+    public const STATUS_CANCELLED = 'cancelled';
+
+    protected $fillable = ['number', 'user_id', 'currency_code',  'due_at', 'status'];
+
+    protected $casts = [
+        'due_at' => 'date',
+    ];
+
+    public bool $send_create_email = true;
+
+    /**
+     * Total of the invoice.
+     *
+     * @return string
+     */
+    public function total(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => $this->items->sum(fn ($item) => $item->price * $item->quantity)
+        );
+    }
+
+    /**
+     * Total of the invoice.
+     *
+     * @return string
+     */
+    public function formattedTotal(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => new Price(['price' => $this->total, 'currency' => $this->currency])
+        );
+    }
+
+    /**
+     * Formatted remaining amount of the invoice.
+     */
+    public function formattedRemaining(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => new Price(['price' => $this->remaining, 'currency' => $this->currency])
+        );
+    }
+
+    /**
+     * Remaining amount of the invoice.
+     */
+    public function remaining(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => $this->total - $this->transactions->sum('amount')
+        );
+    }
+
+    public function currency()
+    {
+        return $this->belongsTo(Currency::class, 'currency_code');
+    }
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+
+    public function items()
+    {
+        return $this->hasMany(InvoiceItem::class);
+    }
+
+    public function transactions()
+    {
+        return $this->hasMany(InvoiceTransaction::class);
+    }
+
+    public function pdf(): Attribute
+    {
+        return Attribute::make(
+            get: fn () => PDF::generateInvoice($this)
+        );
+    }
+}