chore: update document approval workflow and bug fixes

Modules/MaterialLogistics/app/Models/PurchaseOrder.php

@@ -0,0 +1,100 @@
+<?php
+
+namespace Modules\MaterialLogistics\Models;
+
+use App\Models\User;
+use App\Traits\HasPublicIdentifier;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\BelongsToMany;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+use Modules\ApprovalWorkflow\Traits\HasApprovable;
+use Modules\MaterialLogistics\Enums\PaymentStatus;
+use Modules\ProjectManagement\Models\Project;
+
+class PurchaseOrder extends Model
+{
+    use HasPublicIdentifier, HasApprovable;
+
+    protected $fillable = [
+        'document_number', 'supplier', 'status', 'target_warehouse_id',
+        'payment_status', 'paid_at', 'receipt_path', 'receipt_original_name',
+        'requested_by', 'approved_by', 'approved_at', 'notes',
+    ];
+
+    protected function casts(): array
+    {
+        return [
+            'payment_status' => PaymentStatus::class,
+            'approved_at' => 'datetime',
+            'paid_at' => 'datetime',
+        ];
+    }
+
+    public function isPaid(): bool
+    {
+        return $this->payment_status === PaymentStatus::Paid;
+    }
+
+    public function isApproved(): bool
+    {
+        return $this->status === 'approved';
+    }
+
+    public function hasReceipt(): bool
+    {
+        return !empty($this->receipt_path);
+    }
+
+
+    public function targetWarehouse(): BelongsTo
+    {
+        return $this->belongsTo(Warehouse::class, 'target_warehouse_id');
+    }
+
+    public function requester(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'requested_by');
+    }
+
+    public function approver(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'approved_by');
+    }
+
+    public function items(): HasMany
+    {
+        return $this->hasMany(PurchaseOrderItem::class);
+    }
+
+    public function requisitions(): BelongsToMany
+    {
+        return $this->belongsToMany(MaterialRequisition::class, 'purchase_order_requisitions')
+            ->withTimestamps();
+    }
+
+    public function getTotalCostAttribute(): float
+    {
+        return $this->items->sum(fn (PurchaseOrderItem $item) => $item->line_total);
+    }
+
+    public function scopeApproved($query)
+    {
+        return $query->where('status', 'approved');
+    }
+
+    public function onApprovalCompleted($chain)
+    {
+        $this->update(['status' => $chain->status->value]);
+        
+        if ($chain->status->value === 'approved') {
+            $lastStep = $chain->steps()->where('status', 'approved')->orderByDesc('acted_at')->first();
+            $this->update([
+                'approved_by' => $lastStep ? $lastStep->approver_id : null,
+                'approved_at' => $lastStep ? $lastStep->acted_at : now(),
+            ]);
+        } elseif ($chain->status->value === 'rejected') {
+            $this->requisitions()->detach();
+        }
+    }
+}