fix feature report stock product

app/Services/StockReportService.php

@@ -0,0 +1,178 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Product;
+use App\Models\Dealer;
+use App\Models\Stock;
+use App\Models\StockLog;
+use Carbon\Carbon;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Log;
+
+class StockReportService
+{
+    /**
+     * Get stock report data for all products and dealers on a specific date
+     */
+    public function getStockReportData($targetDate = null)
+    {
+        $targetDate = $targetDate ? Carbon::parse($targetDate) : now();
+        
+        // Get all dealers
+        $dealers = Dealer::orderBy('name')->get();
+        
+        // Get all active products
+        $products = Product::where('active', true)
+            ->with(['category'])
+            ->orderBy('name')
+            ->get();
+
+        $data = [];
+        
+        foreach ($products as $product) {
+            $row = [
+                'product_id' => $product->id,
+                'product_code' => $product->code,
+                'product_name' => $product->name,
+                'category_name' => $product->category ? $product->category->name : '-',
+                'unit' => $product->unit ?? '-',
+                'total_stock' => 0
+            ];
+
+            // Calculate stock for each dealer on the target date
+            foreach ($dealers as $dealer) {
+                $stockOnDate = $this->getStockOnDate($product->id, $dealer->id, $targetDate);
+                $row["dealer_{$dealer->id}"] = $stockOnDate;
+                $row['total_stock'] += $stockOnDate;
+            }
+
+            $data[] = $row;
+        }
+
+        return [
+            'data' => $data,
+            'dealers' => $dealers
+        ];
+    }
+
+    /**
+     * Get stock quantity for a specific product and dealer on a given date
+     */
+    public function getStockOnDate($productId, $dealerId, $targetDate)
+    {
+        // Get the latest stock log entry before or on the target date
+        $latestStockLog = StockLog::whereHas('stock', function($query) use ($productId, $dealerId) {
+                $query->where('product_id', $productId)
+                      ->where('dealer_id', $dealerId);
+            })
+            ->where('created_at', '<=', $targetDate->endOfDay())
+            ->orderBy('created_at', 'desc')
+            ->first();
+
+        if ($latestStockLog) {
+            // Return the new_quantity from the latest log entry
+            return $latestStockLog->new_quantity;
+        }
+
+        // If no stock log found, check if there's a current stock record
+        $currentStock = Stock::where('product_id', $productId)
+            ->where('dealer_id', $dealerId)
+            ->first();
+
+        if ($currentStock) {
+            // Check if the stock was created before or on the target date
+            if ($currentStock->created_at <= $targetDate) {
+                return $currentStock->quantity;
+            }
+        }
+
+        // No stock data available for this date
+        return 0;
+    }
+
+    /**
+     * Get optimized stock data using a single query approach
+     */
+    public function getOptimizedStockReportData($targetDate = null)
+    {
+        $targetDate = $targetDate ? Carbon::parse($targetDate) : now();
+        
+        // Get all dealers
+        $dealers = Dealer::orderBy('name')->get();
+        
+        // Get all active products with their stock data
+        $products = Product::where('active', true)
+            ->with(['category', 'stocks.dealer'])
+            ->orderBy('name')
+            ->get();
+
+        $data = [];
+        
+        foreach ($products as $product) {
+            $row = [
+                'product_id' => $product->id,
+                'product_code' => $product->code,
+                'product_name' => $product->name,
+                'category_name' => $product->category ? $product->category->name : '-',
+                'unit' => $product->unit ?? '-',
+                'total_stock' => 0
+            ];
+
+            // Calculate stock for each dealer on the target date
+            foreach ($dealers as $dealer) {
+                $stockOnDate = $this->getOptimizedStockOnDate($product->id, $dealer->id, $targetDate);
+                $row["dealer_{$dealer->id}"] = $stockOnDate;
+                $row['total_stock'] += $stockOnDate;
+            }
+
+            $data[] = $row;
+        }
+
+        return [
+            'data' => $data,
+            'dealers' => $dealers
+        ];
+    }
+
+    /**
+     * Optimized method to get stock on date using subquery
+     */
+    private function getOptimizedStockOnDate($productId, $dealerId, $targetDate)
+    {
+        try {
+            // Use a subquery to get the latest stock log entry efficiently
+            $latestStockLog = DB::table('stock_logs')
+                ->join('stocks', 'stock_logs.stock_id', '=', 'stocks.id')
+                ->where('stocks.product_id', $productId)
+                ->where('stocks.dealer_id', $dealerId)
+                ->where('stock_logs.created_at', '<=', $targetDate->endOfDay())
+                ->orderBy('stock_logs.created_at', 'desc')
+                ->select('stock_logs.new_quantity')
+                ->first();
+
+            if ($latestStockLog) {
+                return $latestStockLog->new_quantity;
+            }
+
+            // If no stock log found, check current stock
+            $currentStock = Stock::where('product_id', $productId)
+                ->where('dealer_id', $dealerId)
+                ->first();
+
+            if ($currentStock && $currentStock->created_at <= $targetDate) {
+                return $currentStock->quantity;
+            }
+
+            return 0;
+        } catch (\Exception $e) {
+            // Log error and return 0
+            Log::error('Error getting stock on date: ' . $e->getMessage(), [
+                'product_id' => $productId,
+                'dealer_id' => $dealerId,
+                'target_date' => $targetDate
+            ]);
+            return 0;
+        }
+    }
+}