Merge pull request #364 from liberu-accounting/sweep/Implement-Invent…

…ory-Management-System-for-Accounting-Application

Implement Inventory Management System for Accounting Application

app/Models/InventoryItem.php

@@ -0,0 +1,65 @@
+
+
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class InventoryItem extends Model
+{
+    use HasFactory;
+
+    protected $primaryKey = 'inventory_item_id';
+
+    protected $fillable = [
+        'name',
+        'sku',
+        'description', 
+        'unit_price',
+        'current_quantity',
+        'reorder_point',
+        'account_id',
+        'category_id',
+        'is_active'
+    ];
+
+    protected $casts = [
+        'unit_price' => 'decimal:2',
+        'current_quantity' => 'integer',
+        'reorder_point' => 'integer',
+        'is_active' => 'boolean'
+    ];
+
+    public function account()
+    {
+        return $this->belongsTo(Account::class);
+    }
+
+    public function category() 
+    {
+        return $this->belongsTo(Category::class);
+    }
+
+    public function transactions()
+    {
+        return $this->hasMany(InventoryTransaction::class);
+    }
+
+    public function adjustments()
+    {
+        return $this->hasMany(InventoryAdjustment::class);
+    }
+
+    public function updateQuantity($change)
+    {
+        $this->current_quantity += $change;
+        $this->save();
+    }
+
+    public function needsReorder()
+    {
+        return $this->current_quantity <= $this->reorder_point;
+    }
+}

app/Models/InventoryTransaction.php

@@ -0,0 +1,39 @@
+
+
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Factories\HasFactory;
+use Illuminate\Database\Eloquent\Model;
+
+class InventoryTransaction extends Model
+{
+    use HasFactory;
+
+    protected $primaryKey = 'inventory_transaction_id';
+
+    protected $fillable = [
+        'inventory_item_id',
+        'transaction_id',
+        'quantity',
+        'unit_price',
+        'transaction_type',
+        'notes'
+    ];
+
+    protected $casts = [
+        'quantity' => 'integer',
+        'unit_price' => 'decimal:2'
+    ];
+
+    public function inventoryItem()
+    {
+        return $this->belongsTo(InventoryItem::class);
+    }
+
+    public function transaction()
+    {
+        return $this->belongsTo(Transaction::class);
+    }
+}

app/Models/Transaction.php

@@ -21,7 +21,7 @@ class Transaction extends Model
         'reconciled',
         'discrepancy_notes',
         'exchange_rate',
-        'purchase_order_id',
+        'transaction_type',
     ];
 
     protected $casts = [
@@ -49,9 +49,9 @@ public function categories()
         return $this->belongsToMany(Category::class);
     }
 
-    public function purchaseOrder()
+    public function inventoryTransactions()
     {
-        return $this->belongsTo(PurchaseOrder::class, 'purchase_order_id');
+        return $this->hasMany(InventoryTransaction::class);
     }
 
     public function getAmountInDefaultCurrency()
@@ -62,4 +62,15 @@ public function getAmountInDefaultCurrency()
         }
         return $this->amount * $this->exchange_rate;
     }
+
+    public function updateInventory()
+    {
+        foreach ($this->inventoryTransactions as $inventoryTx) {
+            $quantity = $inventoryTx->quantity;
+            if ($this->transaction_type === 'sale') {
+                $quantity *= -1;
+            }
+            $inventoryTx->inventoryItem->updateQuantity($quantity);
+        }
+    }
 }

app/Services/InventoryService.php

@@ -0,0 +1,46 @@
+
+
+<?php
+
+namespace App\Services;
+
+use App\Models\InventoryItem;
+use App\Models\Transaction;
+use App\Models\InventoryTransaction;
+
+class InventoryService
+{
+    public function createInventoryTransaction(
+        Transaction $transaction,
+        InventoryItem $item,
+        int $quantity,
+        float $unitPrice,
+        string $type
+    ) {
+        $inventoryTx = InventoryTransaction::create([
+            'inventory_item_id' => $item->id,
+            'transaction_id' => $transaction->id,
+            'quantity' => $quantity,
+            'unit_price' => $unitPrice,
+            'transaction_type' => $type
+        ]);
+
+        $change = $type === 'sale' ? -$quantity : $quantity;
+        $item->updateQuantity($change);
+
+        return $inventoryTx;
+    }
+
+    public function checkLowStock()
+    {
+        return InventoryItem::where('is_active', true)
+            ->where('current_quantity', '<=', 'reorder_point')
+            ->get();
+    }
+
+    public function getInventoryValue()
+    {
+        return InventoryItem::where('is_active', true)
+            ->sum(\DB::raw('unit_price * current_quantity'));
+    }
+}

database/migrations/2024_02_14_000001_create_inventory_items_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
+{
+    public function up()
+    {
+        Schema::create('inventory_items', function (Blueprint $table) {
+            $table->id('inventory_item_id');
+            $table->string('name');
+            $table->string('sku')->unique();
+            $table->text('description')->nullable();
+            $table->decimal('unit_price', 15, 2);
+            $table->integer('current_quantity')->default(0);
+            $table->integer('reorder_point')->default(0);
+            $table->foreignId('account_id')->constrained('accounts');
+            $table->foreignId('category_id')->nullable()->constrained('categories');
+            $table->boolean('is_active')->default(true);
+            $table->timestamps();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('inventory_items');
+    }
+};

database/migrations/2024_02_14_000002_create_inventory_transactions_table.php

@@ -0,0 +1,29 @@
+
+
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up()
+    {
+        Schema::create('inventory_transactions', function (Blueprint $table) {
+            $table->id('inventory_transaction_id');
+            $table->foreignId('inventory_item_id')->constrained('inventory_items');
+            $table->foreignId('transaction_id')->constrained('transactions');
+            $table->integer('quantity');
+            $table->decimal('unit_price', 15, 2);
+            $table->enum('transaction_type', ['purchase', 'sale', 'adjustment']);
+            $table->text('notes')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down()
+    {
+        Schema::dropIfExists('inventory_transactions');
+    }
+};