Add invoice duplication feature - closes #9

In this commit, we have added:
1. Duplicate Invoice button on invoice detail page
2. Invoice duplication will created as Invoice Draft in session
3. Invoice items, project, and customer same with old invoice
4. User can change invoice item as needed
5. Invoice will be saved with new invoice number

app/Http/Controllers/Invoices/DuplicationController.php

@@ -0,0 +1,35 @@
+<?php
+
+namespace App\Http\Controllers\Invoices;
+
+use App\Entities\Invoices\Invoice;
+use App\Http\Controllers\Controller;
+use App\Services\InvoiceDrafts\Item;
+use App\Services\InvoiceDrafts\InvoiceDraft;
+use App\Services\InvoiceDrafts\InvoiceDraftCollection;
+
+class DuplicationController extends Controller
+{
+    private $draftCollection;
+
+    public function __construct()
+    {
+        $this->draftCollection = new InvoiceDraftCollection();
+    }
+
+    public function store(Invoice $invoice)
+    {
+        $draft = new InvoiceDraft();
+        $this->draftCollection->add($draft);
+
+        foreach ($invoice->items as $existingItem) {
+            $item = new Item(['description' => $existingItem['description'], 'amount' => $existingItem['amount']]);
+            $this->draftCollection->addItemToDraft($draft->draftKey, $item);
+        }
+        $draft->date = today()->format('Y-m-d');
+        $draft->projectId = $invoice->project_id;
+        $draft->notes = $invoice->notes;
+
+        return redirect()->route('invoice-drafts.show', $draft->draftKey);
+    }
+}

resources/lang/de/invoice.php

@@ -22,6 +22,7 @@ return [
     'save'                => 'Rechnung speichern',
     'created'             => 'Neue Rechnung wurde erstellt.',
     'show'                => 'Rechnungsdetails',
+    'duplicate'           => 'Duplicate Invoice',
     'edit'                => 'Rechnung bearbeiten',
     'update'              => 'Rechnung aktualisieren',
     'updated'             => 'Rechnungsdetails wurden aktualisiert.',

resources/lang/en/invoice.php

@@ -22,6 +22,7 @@ return [
     'save'                => 'Save Invoice',
     'created'             => 'New Invoice has been created.',
     'show'                => 'View Invoice Detail',
+    'duplicate'           => 'Duplicate Invoice',
     'edit'                => 'Edit Invoice',
     'update'              => 'Update Invoice',
     'updated'             => 'Invoice data has been updated.',

resources/lang/id/invoice.php

@@ -22,6 +22,7 @@ return [
     'save'                => 'Simpan Invoice',
     'created'             => 'Input Invoice baru telah berhasil.',
     'show'                => 'Lihat Detail Invoice',
+    'duplicate'           => 'Duplikat Invoice',
     'edit'                => 'Edit Invoice',
     'update'              => 'Update Invoice',
     'updated'             => 'Update data Invoice telah berhasil.',

resources/views/invoices/show.blade.php

@@ -5,6 +5,7 @@
 @section('content')
 <h1 class="page-header">
     <div class="pull-right">
+        {!! FormField::formButton(['route' => ['invoices.duplication.store', $invoice]], __('invoice.duplicate'), ['class' => 'btn btn-default']) !!}
         {{ link_to_route('invoices.edit', trans('invoice.edit'), [$invoice], ['class' => 'btn btn-warning']) }}
         {{ link_to_route('invoices.pdf', trans('invoice.print'), [$invoice], ['class' => 'btn btn-default']) }}
         {{ link_to_route('projects.invoices', trans('invoice.back_to_project'), [$invoice->project_id], ['class' => 'btn btn-default']) }}

routes/web/invoices.php

@@ -28,4 +28,9 @@ Route::group(['middleware' => ['web', 'role:admin'], 'namespace' => 'Invoices'],
     Route::post('invoices/{invoice}/items', ['as' => 'invoices.items.store', 'uses' => 'ItemsController@store']);
     Route::patch('invoices/{invoice}/items', ['as' => 'invoices.items.update', 'uses' => 'ItemsController@update']);
     Route::delete('invoices/{invoice}/items', ['as' => 'invoices.items.destroy', 'uses' => 'ItemsController@destroy']);
+
+    /*
+     * Invoice Duplication Route
+     */
+    Route::post('invoices/{invoice}/duplicate', ['as' => 'invoices.duplication.store', 'uses' => 'DuplicationController@store']);
 });

tests/Feature/Invoices/InvoiceDuplicateTest.php

@@ -0,0 +1,39 @@
+<?php
+
+namespace Tests\Feature\Invoices;
+
+use Tests\TestCase;
+use App\Entities\Invoices\Invoice;
+use App\Services\InvoiceDrafts\InvoiceDraftCollection;
+
+/**
+ * Invoice Duplicate Feature Test.
+ *
+ * @author Nafies Luthfi <nafiesl@gmail.com>
+ */
+class InvoiceDuplicateTest extends TestCase
+{
+    /** @test */
+    public function user_can_create_invoice_draft_by_duplicate_existing_invoice()
+    {
+        $this->adminUserSigningIn();
+        $invoice = factory(Invoice::class)->create([
+            'items' => [
+                [
+                    'description' => 'Item 1 description',
+                    'amount'      => 100000,
+                ],
+                [
+                    'description' => 'Item 1 description',
+                    'amount'      => 150000,
+                ],
+            ],
+        ]);
+        $this->visit(route('invoices.show', $invoice));
+
+        $this->press(trans('invoice.duplicate'));
+        $invoiceDrafts = new InvoiceDraftCollection();
+        $draft = $invoiceDrafts->content()->last();
+        $this->seePageIs(route('invoice-drafts.show', $draft->draftKey));
+    }
+}