Invoice models and migrations

app/Exceptions/InvoiceLockedException.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Exceptions;
+
+use Exception;
+
+class InvoiceLockedException extends Exception
+{
+    public function __construct()
+    {
+        parent::__construct('Cannot modify a posted, void, or paid invoice.');
+    }
+}

app/Models/Client.php

@@ -5,6 +5,7 @@ namespace App\Models;
 use App\Enums\ClientStatus;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Client extends Model
 {
@@ -33,6 +34,11 @@ class Client extends Model
             ->withPivot('is_primary');
     }
 
+    public function invoices(): HasMany
+    {
+        return $this->hasMany(Invoice::class);
+    }
+
     public function secondaryContacts(): BelongsToMany
     {
         return $this->belongsToMany(Contact::class)

app/Models/Contact.php

@@ -2,6 +2,7 @@
 
 namespace App\Models;
 
+use Illuminate\Database\Eloquent\Builder;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Database\Eloquent\Relations\BelongsToMany;
 use Illuminate\Database\Eloquent\Relations\HasMany;
@@ -14,4 +15,11 @@ class Contact extends Model
     {
         return $this->belongsToMany(Client::class);
     }
+
+    public function invoices(): Builder
+    {
+        return Invoice::whereIn('client_id', $this->clients()->pluck('clients.id'));
+    }
+
+
 }

app/Models/Invoice.php

@@ -5,19 +5,53 @@ namespace App\Models;
 use App\Casts\MoneyCast;
 use App\Enums\InvoiceStatus;
 use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
 
 class Invoice extends Model
 {
+    protected $fillable = [
+        'invoice_number',
+        'client_id',
+        'status',
+        'invoice_date',
+        'sent_at',
+        'due_date',
+        'notes',
+        'internal_notes',
+    ];
+
     protected $casts = [
         'total' => MoneyCast::class,
         'status' => InvoiceStatus::class,
         'invoice_date' => 'date',
         'due_date' => 'date',
-        'date_sent' => 'date',
+        'sent_at' => 'date',
     ];
 
+    public function client(): BelongsTo
+    {
+        return $this->belongsTo(Client::class);
+    }
+
+    public function lines(): HasMany
+    {
+        return $this->hasMany(InvoiceLine::class);
+    }
+
     public function formattedTotal(): string
     {
         return '$'.number_format($this->total, 2);
     }
+
+    public function recalculateTotal(): void
+    {
+        $this->total = $this->lines()->sum('amount');
+        $this->saveQuietly();
+    }
+
+    public function isLocked(): bool
+    {
+        return in_array($this->status, [InvoiceStatus::POSTED, InvoiceStatus::PAID, InvoiceStatus::VOID]);
+    }
 }

app/Models/InvoiceLine.php

@@ -0,0 +1,67 @@
+<?php
+
+namespace App\Models;
+
+use App\Casts\MoneyCast;
+use App\Exceptions\InvoiceLockedException;
+use Illuminate\Database\Eloquent\Casts\Attribute;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class InvoiceLine extends Model
+{
+    protected $fillable = [
+        'invoice_id',
+        'sku',
+        'name',
+        'description',
+        'school_year',
+        'quantity',
+        'unit_price',
+    ];
+
+    protected $casts = [
+        'unit_price' => MoneyCast::class,
+        'amount' => MoneyCast::class,
+    ];
+
+    public static function booted(): void
+    {
+        static::saving(function (InvoiceLine $line) {
+            if ($line->invoice->isLocked()) {
+                throw new InvoiceLockedException;
+            }
+
+            $line->amount = $line->unit_price * $line->quantity;
+        });
+
+        static::saved(function (InvoiceLine $line) {
+            $line->invoice->recalculateTotal();
+        });
+
+        static::deleting(function (InvoiceLine $line) {
+            if ($line->invoice->isLocked()) {
+                throw new InvoiceLockedException;
+            }
+        });
+
+        static::deleted(function (InvoiceLine $line) {
+            $line->invoice->recalculateTotal();
+        });
+    }
+
+    public function invoice(): BelongsTo
+    {
+        return $this->belongsTo(Invoice::class);
+    }
+
+    public function product(): BelongsTo
+    {
+        return $this->belongsTo(Product::class);
+    }
+
+    protected function schoolYearFormatted(): Attribute
+    {
+        return Attribute::get(fn () => ($this->school_year - 1).'-'.$this->school_year);
+    }
+}

app/Models/Product.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Models;
+
+use App\Casts\MoneyCast;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+class Product extends Model
+{
+    protected $fillable = [
+        'active',
+        'sku',
+        'name',
+        'description',
+        'price',
+    ];
+
+    protected $casts = [
+        'price' => MoneyCast::class,
+    ];
+
+    public function invoiceLines(): HasMany
+    {
+        return $this->hasMany(InvoiceLine::class);
+    }
+
+}

database/migrations/2026_01_28_023011_create_client_contact_table.php

@@ -15,8 +15,8 @@ return new class extends Migration
     {
         Schema::create('client_contact', function (Blueprint $table) {
             $table->id();
-            $table->foreignIdFor(Client::class);
-            $table->foreignIdFor(Contact::class);
+            $table->foreignIdFor(Client::class)->constrained();
+            $table->foreignIdFor(Contact::class)->constrained();
             $table->boolean('is_primary')->default(false);
             $table->timestamps();
 

database/migrations/2026_01_28_024527_create_invoices_table.php

@@ -15,12 +15,12 @@ return new class extends Migration
         Schema::create('invoices', function (Blueprint $table) {
             $table->id();
             $table->string('invoice_number')->unique();
-            $table->foreignIdFor(Client::class);
+            $table->foreignIdFor(Client::class)->constrained();
             $table->string('status')->default('draft');
             $table->date('invoice_date')->nullable();
-            $table->date('date_sent')->nullable();
+            $table->date('sent_at')->nullable();
             $table->date('due_date')->nullable();
-            $table->integer('total');
+            $table->unsignedBigInteger('total')->default(0);
             $table->text('notes')->nullable();
             $table->text('internal_notes')->nullable();
             $table->timestamps();

database/migrations/2026_01_28_040010_create_products_table.php

@@ -0,0 +1,32 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('products', function (Blueprint $table) {
+            $table->id();
+            $table->boolean('active')->default(true);
+            $table->string('sku')->unique();
+            $table->string('name');
+            $table->string('description')->nullable();
+            $table->unsignedBigInteger('price');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('products');
+    }
+};

database/migrations/2026_01_28_040017_create_invoice_lines_table.php

@@ -0,0 +1,38 @@
+<?php
+
+use App\Models\Invoice;
+use App\Models\Product;
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('invoice_lines', function (Blueprint $table) {
+            $table->id();
+            $table->foreignIdFor(Invoice::class)->constrained();
+            $table->foreignIdFor(Product::class)->nullable()->constrained();
+            $table->string('sku')->nullable();
+            $table->string('name');
+            $table->string('description')->nullable();
+            $table->unsignedInteger('school_year')->nullable();
+            $table->decimal('quantity', 10, 2)->default(1);
+            $table->unsignedBigInteger('unit_price');
+            $table->unsignedBigInteger('amount');
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('invoice_lines');
+    }
+};