<?php

namespace App\Http\Controllers\WarehouseManagement;

use App\Enums\OpnameStatus;
use App\Http\Controllers\Controller;
use App\Models\Dealer;
use App\Models\Menu;
use App\Models\Opname;
use App\Models\OpnameDetail;
use App\Models\Product;
use App\Models\Stock;
use App\Models\User;
use Carbon\Carbon;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Log;
use Illuminate\Validation\Rule;
use Yajra\DataTables\Facades\DataTables;
use Illuminate\Support\Facades\Gate;

class OpnamesController extends Controller
{
    public function index(Request $request){
        $menu = Menu::where('link','opnames.index')->first();
        abort_if(!Gate::allows('view', $menu), 403);
        $dealers = Dealer::all();
        if($request->ajax()){
            $data = Opname::query()
                         ->with(['user','dealer', 'details.product'])
                         ->orderBy('created_at', 'desc');

            // Filter berdasarkan dealer yang dipilih
            if ($request->filled('dealer_filter')) {
                $data->where('dealer_id', $request->dealer_filter);
            }

            // Filter berdasarkan tanggal
            if ($request->filled('date_from')) {
                try {
                    $dateFrom = \Carbon\Carbon::parse($request->date_from)->format('Y-m-d');
                    $data->whereDate('opname_date', '>=', $dateFrom);
                } catch (\Exception $e) {
                    // Fallback to original format
                    $data->whereDate('opname_date', '>=', $request->date_from);
                }
            }
            
            if ($request->filled('date_to')) {
                try {
                    $dateTo = \Carbon\Carbon::parse($request->date_to)->format('Y-m-d');
                    $data->whereDate('opname_date', '<=', $dateTo);
                } catch (\Exception $e) {
                    // Fallback to original format
                    $data->whereDate('opname_date', '<=', $request->date_to);
                }
            }

            return DataTables::of($data)
            ->addColumn('user_name', function ($row){
                return $row->user ? $row->user->name : '-';
            })
            ->addColumn('dealer_name', function ($row){
                return $row->dealer ? $row->dealer->name : '-';
            })
            ->editColumn('opname_date', function ($row){
                return $row->opname_date ? Carbon::parse($row->opname_date)->format('d M Y') : '-';
            })
            ->editColumn('created_at', function ($row) {
                return Carbon::parse($row->created_at)->format('d M Y H:i');
            })
            ->editColumn('status', function ($row) {
                $status = $row->status instanceof OpnameStatus ? $row->status : OpnameStatus::from($row->status);
                $textColorClass = $status->textColorClass();
                $label = $status->label();
                
                return "<span class=\"font-weight-bold {$textColorClass}\">{$label}</span>";
            })
            ->addColumn('stock_info', function ($row) {
                // Use eager loaded details
                $details = $row->details;
                
                if ($details->isEmpty()) {
                    return '<span class="text-muted">Tidak ada data</span>';
                }
                
                $totalProducts = $details->count();
                $matchingProducts = $details->where('difference', 0)->count();
                $differentProducts = $totalProducts - $matchingProducts;
                
                $info = [];
                
                if ($matchingProducts > 0) {
                    $info[] = "<span class='text-success'><i class='fa fa-check-circle'></i> {$matchingProducts} sesuai</span>";
                }
                
                if ($differentProducts > 0) {
                    // Get more details about differences
                    $positiveDiff = $details->where('difference', '>', 0)->count();
                    $negativeDiff = $details->where('difference', '<', 0)->count();
                    
                    $diffInfo = [];
                    if ($positiveDiff > 0) {
                        $diffInfo[] = "+{$positiveDiff}";
                    }
                    if ($negativeDiff > 0) {
                        $diffInfo[] = "-{$negativeDiff}";
                    }
                    
                    $diffText = implode(', ', $diffInfo);
                    $info[] = "<span class='text-danger'><i class='fa fa-exclamation-triangle'></i> {$differentProducts} selisih ({$diffText})</span>";
                }
                
                // Add total products info
                $info[] = "<small class='text-muted'>(Total: {$totalProducts} produk)</small>";
                
                return '<div class="stock-info-cell">' . implode('<br>', $info) . '</div>';
            })
            ->addColumn('action', function ($row) use ($menu) {
                $btn = '<div class="d-flex">';

                $btn .= '<a href="'.route('opnames.show', $row->id).'" class="btn btn-primary btn-sm" style="margin-right: 8px;">Detail</a>';
                $btn .= '<a href="'.route('opnames.print', $row->id).'" class="btn btn-success btn-sm" target="_blank">Print</a>';
                
                $btn .= '</div>';
                
                return $btn;
            })
            ->rawColumns(['action', 'status', 'stock_info'])
            ->make(true);
        }

        return view('warehouse_management.opnames.index', compact('dealers'));
    }

    public function create(){
        try{
            $dealers = Dealer::all();
            $products = Product::where('active', true)->get();
            
            // Get initial stock data for the first dealer (if any)
            $initialDealerId = $dealers->first()?->id;
            $stocks = [];
            if ($initialDealerId) {
                $stocks = Stock::where('dealer_id', $initialDealerId)
                              ->whereIn('product_id', $products->pluck('id'))
                              ->get()
                              ->keyBy('product_id');
            }
            
            return view('warehouse_management.opnames.create', compact('dealers', 'products', 'stocks'));
        } catch(\Exception $ex) {
            Log::error($ex->getMessage());
            return back()->with('error', 'Terjadi kesalahan saat memuat data');
        }
    }

    public function store(Request $request)
    {
        try {
            DB::beginTransaction();

            // Check if this is from transaction form or regular opname form
            $isTransactionForm = $request->has('form') && $request->form === 'opname';
            
            if ($isTransactionForm) {
                // Simplified validation for transaction form
                $request->validate([
                    'dealer_id' => 'required|exists:dealers,id',
                    'user_id' => 'required|exists:users,id',
                    'opname_date' => [
                        'nullable',
                        'string',
                        'date_format:Y-m-d',
                        'before_or_equal:today'
                    ],
                    'description' => 'nullable|string|max:1000',
                    'product_id' => 'required|array|min:1',
                    'product_id.*' => 'required|exists:products,id',
                    'system_stock' => 'required|array',
                    'system_stock.*' => 'required|numeric|min:0',
                    'physical_stock' => 'required|array',
                    'physical_stock.*' => 'nullable|numeric|min:0'
                ]);
                
                // Process transaction form data with proper date parsing
                $dealerId = $request->dealer_id;
                $userId = $request->user_id;
                
                // Parse opname date (YYYY-MM-DD format) or use today if empty
                $inputDate = $request->opname_date ?: now()->format('Y-m-d');
                Log::info('Parsing opname date', ['input' => $request->opname_date, 'using' => $inputDate]);
                $opnameDate = Carbon::createFromFormat('Y-m-d', $inputDate);
                Log::info('Successfully parsed opname date', ['parsed' => $opnameDate->format('Y-m-d')]);
                
                $note = $request->description;
                $productIds = $request->product_id;
                $systemStocks = $request->system_stock;
                $physicalStocks = $request->physical_stock;
                
                // Log input data untuk debugging
                Log::info('Transaction form input data', [
                    'product_ids' => $productIds,
                    'system_stocks' => $systemStocks,
                    'physical_stocks' => $physicalStocks,
                    'dealer_id' => $dealerId,
                    'user_id' => $userId
                ]);
                
            } else {
                // Original validation for regular opname form
                $request->validate([
                    'dealer' => 'required|exists:dealers,id',
                    'product' => 'required|array|min:1',
                    'product.*' => 'required|exists:products,id',
                    'system_quantity' => 'required|array',
                    'system_quantity.*' => 'required|numeric|min:0',
                    'physical_quantity' => 'required|array',
                    'physical_quantity.*' => 'required|numeric|min:0',
                    'note' => 'nullable|string|max:1000',
                    'item_notes' => 'nullable|array',
                    'item_notes.*' => 'nullable|string|max:255',
                    'opname_date' => 'nullable|date' // Add opname_date validation for regular form
                ]);
                
                // Process regular form data
                $dealerId = $request->dealer;
                $userId = auth()->id();
                
                // Use provided date or current date
                $inputDate = $request->opname_date ?: now()->format('Y-m-d');
                $opnameDate = $request->opname_date ? 
                    Carbon::createFromFormat('Y-m-d', $inputDate) : 
                    now();
                
                $note = $request->note;
                $productIds = $request->product;
                $systemStocks = $request->system_quantity;
                $physicalStocks = $request->physical_quantity;
            }

            // 2. Simplified validation - all products are valid, set defaults for empty physical stocks
            $validProductIds = array_filter($productIds);
            
            if (empty($validProductIds) || count($validProductIds) === 0) {
                throw new \Exception('Minimal harus ada satu produk untuk opname.');
            }

            // 3. Validasi duplikasi produk
            $productCounts = array_count_values($validProductIds);
            foreach ($productCounts as $productId => $count) {
                if ($count > 1) {
                    throw new \Exception('Produk tidak boleh duplikat dalam satu opname.');
                }
            }

            // 4. Validasi dealer
            $dealer = Dealer::findOrFail($dealerId);

            // 5. Validasi user exists
            $user = User::findOrFail($userId);

            // 6. Validasi produk aktif
            $filteredProductIds = array_filter($productIds);
            $inactiveProducts = Product::whereIn('id', $filteredProductIds)
                                    ->where('active', false)
                                    ->pluck('name')
                                    ->toArray();
            
            if (!empty($inactiveProducts)) {
                throw new \Exception('Produk berikut tidak aktif: ' . implode(', ', $inactiveProducts));
            }

            // 7. Validasi stock difference (for transaction form, we'll allow any difference without note requirement)
            $stockDifferences = [];
            if (!$isTransactionForm) {
                // Only validate notes for regular opname form
                foreach ($productIds as $index => $productId) {
                    if (!$productId) continue;

                    $systemStock = floatval($systemStocks[$index] ?? 0);
                    $physicalStock = floatval($physicalStocks[$index] ?? 0);
                    $itemNote = $request->input("item_notes.{$index}");

                    // Jika ada perbedaan stock dan note kosong
                    if (abs($systemStock - $physicalStock) > 0.01 && empty($itemNote)) {
                        $product = Product::find($productId);
                        $stockDifferences[] = $product->name;
                    }
                }

                if (!empty($stockDifferences)) {
                    throw new \Exception(
                        'Catatan harus diisi untuk produk berikut karena ada perbedaan stock: ' . 
                        implode(', ', $stockDifferences)
                    );
                }
            }

            // 8. Create Opname master record with approved status
            $opname = Opname::create([
                'dealer_id' => $dealerId,
                'opname_date' => $opnameDate,
                'user_id' => $userId,
                'note' => $note,
                'status' => OpnameStatus::APPROVED,  // Set status langsung approved
                'approved_by' => $userId,  // Set current user sebagai approver
                'approved_at' => now()  // Set waktu approval
            ]);

            // 9. Create OpnameDetails and update stock - only for valid entries
            $details = [];
            $processedCount = 0;
            
            foreach ($productIds as $index => $productId) {
                if (!$productId) continue;
                
                // Set default value to 0 if physical stock is empty or invalid
                $physicalStockValue = $physicalStocks[$index] ?? null;
                if ($physicalStockValue === '' || $physicalStockValue === null || !is_numeric($physicalStockValue)) {
                    $physicalStockValue = 0;
                }

                $systemStock = floatval($systemStocks[$index] ?? 0);
                $physicalStock = floatval($physicalStockValue);
                $difference = $physicalStock - $systemStock;
                
                $processedCount++;

                // Get item note (only for regular opname form)
                $itemNote = null;
                if (!$isTransactionForm) {
                    $itemNote = $request->input("item_notes.{$index}");
                }

                // Create opname detail
                $details[] = [
                    'opname_id' => $opname->id,
                    'product_id' => $productId,
                    'system_stock' => $systemStock,
                    'physical_stock' => $physicalStock,
                    'difference' => $difference,
                    'note' => $itemNote,
                    'created_at' => now(),
                    'updated_at' => now()
                ];

                // Update stock langsung karena auto approve
                $stock = Stock::firstOrCreate(
                    [
                        'product_id' => $productId,
                        'dealer_id' => $dealerId
                    ],
                    ['quantity' => 0]
                );

                // Update stock dengan physical stock
                $stock->updateStock(
                    $physicalStock,
                    $opname,
                    "Stock adjustment from auto-approved opname #{$opname->id}"
                );
            }

            // Validate we have at least one detail to insert
            if (empty($details)) {
                throw new \Exception('Tidak ada data produk yang valid untuk diproses.');
            }
            
            // Bulk insert untuk performa lebih baik
            OpnameDetail::insert($details);

            // 10. Log aktivitas dengan detail produk yang diproses
            $processedProducts = collect($details)->map(function($detail) {
                return [
                    'product_id' => $detail['product_id'],
                    'system_stock' => $detail['system_stock'],
                    'physical_stock' => $detail['physical_stock'],
                    'difference' => $detail['difference']
                ];
            });
            
            Log::info('Opname created and auto-approved', [
                'opname_id' => $opname->id,
                'dealer_id' => $opname->dealer_id,
                'user_id' => $userId,
                'approver_id' => $userId,
                'product_count' => count($details),
                'processed_count' => $processedCount,
                'form_type' => $isTransactionForm ? 'transaction' : 'regular',
                'opname_date' => $opnameDate->format('Y-m-d'),
                'processed_products' => $processedProducts->toArray()
            ]);

            DB::commit();

            if ($isTransactionForm) {
                // Redirect back to transaction page with success message and tab indicator
                return redirect()
                    ->route('transaction')
                    ->with('success', "Opname berhasil disimpan. {$processedCount} produk telah diproses.")
                    ->with('active_tab', 'opname');
            } else {
                // Redirect to opname index for regular form
                return redirect()
                    ->route('opnames.index')
                    ->with('success', "Opname berhasil disimpan. {$processedCount} produk telah diproses.");
            }

        } catch (\Illuminate\Validation\ValidationException $e) {
            DB::rollBack();
            Log::error('Validation error in OpnamesController@store', [
                'errors' => $e->errors(),
                'input' => $request->all()
            ]);
            
            if ($isTransactionForm) {
                return redirect()
                    ->route('transaction')
                    ->withErrors($e->validator)
                    ->withInput()
                    ->with('error', 'Terjadi kesalahan validasi. Periksa kembali data yang dimasukkan.')
                    ->with('active_tab', 'opname');
            } else {
                return back()->withErrors($e->validator)->withInput();
            }
        } catch (\Exception $e) {
            DB::rollBack();
            Log::error('Error in OpnamesController@store: ' . $e->getMessage());
            Log::error($e->getTraceAsString());
            Log::error('Request data:', $request->all());
            
            $errorMessage = $e->getMessage();
            
            if ($isTransactionForm) {
                return redirect()
                    ->route('transaction')
                    ->with('error', $errorMessage)
                    ->withInput()
                    ->with('active_tab', 'opname');
            } else {
                return back()
                    ->with('error', $errorMessage)
                    ->withInput();
            }
        }
    }

    public function show(Request $request, $id)
    {
        try {
            $opname = Opname::with('details.product', 'user')->findOrFail($id);
    
            if ($request->ajax()) {
                return DataTables::of($opname->details)
                    ->addIndexColumn()
                    ->addColumn('opname_date', function () use ($opname) {
                        return Carbon::parse($opname->opname_date)->format('d M Y');
                    })
                    ->addColumn('user_name', function () use ($opname) {
                        return $opname->user ? $opname->user->name : '-';
                    })
                    ->addColumn('product_name', function ($detail) {
                        return $detail->product->name ?? '-';
                    })
                    ->addColumn('system_stock', function ($detail) {
                        return $detail->system_stock;
                    })
                    ->addColumn('physical_stock', function ($detail) {
                        return $detail->physical_stock;
                    })
                    ->addColumn('difference', function ($detail) {
                        return $detail->difference;
                    })
                    ->make(true);
            }
    
            return view('warehouse_management.opnames.detail', compact('opname'));
        } catch (\Exception $ex) {
            Log::error($ex->getMessage());
            abort(500, 'Something went wrong');
        }
    }

    // Add new method to get stock data via AJAX
    public function getStockData(Request $request)
    {
        try {
            $dealerId = $request->dealer_id;
            $productIds = $request->product_ids;

            if (!$dealerId || !$productIds) {
                return response()->json(['error' => 'Dealer ID dan Product IDs diperlukan'], 400);
            }

            $stocks = Stock::where('dealer_id', $dealerId)
                          ->whereIn('product_id', $productIds)
                          ->get()
                          ->mapWithKeys(function ($stock) {
                              return [$stock->product_id => $stock->quantity];
                          });

            return response()->json(['stocks' => $stocks]);
        } catch (\Exception $e) {
            Log::error('Error getting stock data: ' . $e->getMessage());
            return response()->json(['error' => 'Terjadi kesalahan saat mengambil data stok'], 500);
        }
    }

    public function print($id)
    {
        try {
            $opname = Opname::with(['details.product.category', 'user', 'dealer'])
                           ->findOrFail($id);
            
            return view('warehouse_management.opnames.print', compact('opname'));
        } catch (\Exception $e) {
            Log::error('Error printing opname: ' . $e->getMessage());
            return back()->with('error', 'Gagal membuka halaman print opname.');
        }
    }


}