<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Models\Transaction\Order;
use App\Models\Transaction\Invoice;
use App\Models\Transaction\DispenseRecord;
use App\Models\Transaction\PaymentType;
use App\Models\Transaction\OrderItem;
use App\Models\Transaction\PickupCode;
use App\Models\Transaction\PickupCodeLog;
use App\Models\Transaction\PassCode;
use App\Models\Transaction\PassCodeLog;
use App\Models\Machine\Machine;
use Carbon\Carbon;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Facades\DB;

use App\Models\System\SystemOperationLog;

class SalesController extends Controller
{
    // 銷售中心 (銷售&金流紀錄)
    public function index(Request $request)
    {
        $tab = $request->input('tab', 'orders');
        $isAjax = $request->ajax();
        
        // 取得篩選參數
        $search = $request->input('search');
        $machineId = $request->input('machine_id');
        $paymentType = $request->input('payment_type');
        $status = $request->input('status');
        $startDate = $request->input('start_date');
        $endDate = $request->input('end_date');

        // 判斷是否為隱含篩選 (未選日期時預設抓6個月)
        $isImplicitFilter = false;
        if (!$startDate || !$endDate) {
            $isImplicitFilter = true;
            $startDate = now()->subMonths(6)->format('Y-m-d H:i');
            $endDate = now()->format('Y-m-d H:i');
        }

        $data = [
            'title' => '銷售&金流紀錄',
            'description' => '銷售交易與金流明細查詢',
            'tab' => $tab,
            'filters' => [
                'search' => $search,
                'machine_id' => $machineId,
                'payment_type' => $paymentType,
                'status' => $status,
                'start_date' => $request->input('start_date'), // 保留原始輸入以顯示於 UI (如果是隱含的則 UI 顯示空)
                'end_date' => $request->input('end_date'),
            ],
            'isImplicitFilter' => $isImplicitFilter,
            'machines' => Machine::select('id', 'name', 'serial_no')->get(),
            'paymentTypes' => Order::getPaymentTypeLabels(),
        ];

        // 1. 建立基本查詢 (套用共用過濾器：機台、日期)
        $ordersQuery = Order::with([
            'machine:id,name,serial_no', 
            'invoice:id,order_id,invoice_no', 
            'items', 
            'staffCardLog:id,order_id,staff_card_id',
            'staffCardLog.staffCard:id,employee_id,name,card_uid'
        ]);
        $invoicesQuery = Invoice::with(['machine:id,name,serial_no', 'order:id,order_no,flow_id,payment_type']);
        $dispenseQuery = DispenseRecord::with(['order:id,order_no,flow_id', 'machine:id,name,serial_no', 'product:id,name']);

        // 共用過濾器：日期
        $start = Carbon::parse($startDate);
        $end = Carbon::parse($endDate)->endOfMinute();
        
        $ordersQuery->whereBetween('created_at', [$start, $end]);
        $invoicesQuery->whereBetween('invoice_date', [$start, $end]);
        $dispenseQuery->whereBetween('machine_time', [$start, $end]);

        // 共用過濾器：機台
        if ($machineId) {
            $ordersQuery->where('machine_id', $machineId);
            $invoicesQuery->where('machine_id', $machineId);
            $dispenseQuery->where('machine_id', $machineId);
        }

        // 2. 應用獨立過濾器：搜尋 (僅對當前 Tab 應用)
        if ($search) {
            if ($tab === 'orders') {
                $ordersQuery->where(function($q) use ($search) {
                    $q->where('order_no', 'like', "%{$search}%")
                      ->orWhere('flow_id', 'like', "%{$search}%")
                      ->orWhere('invoice_info', 'like', "%{$search}%")
                      ->orWhere('member_barcode', 'like', "%{$search}%")
                      ->orWhereHas('staffCardLog.staffCard', function($sq) use ($search) {
                          $sq->where('name', 'like', "%{$search}%")
                            ->orWhere('employee_id', 'like', "%{$search}%")
                            ->orWhere('card_uid', 'like', "%{$search}%");
                      });
                });
            } elseif ($tab === 'invoices') {
                $invoicesQuery->where(function($q) use ($search) {
                    $q->where('invoice_no', 'like', "%{$search}%")
                      ->orWhere('flow_id', 'like', "%{$search}%");
                });
            } elseif ($tab === 'dispense') {
                $dispenseQuery->where(function($q) use ($search) {
                    $q->where('slot_no', 'like', "%{$search}%")
                      ->orWhereHas('product', function($pq) use ($search) {
                          $pq->where('name', 'like', "%{$search}%");
                      })
                      ->orWhereHas('order', function($oq) use ($search) {
                          $oq->where('order_no', 'like', "%{$search}%");
                      });
                });
            }
        }

        // 訂單專用過濾器
        if ($tab === 'orders') {
            if ($paymentType) $ordersQuery->where('payment_type', $paymentType);
            if ($status) $ordersQuery->where('status', $status);
        }

        // 匯出功能攔截
        if ($request->filled('export')) {
            $exportType = $request->input('export');
            return $this->handleExport($tab, $exportType, $ordersQuery, $invoicesQuery, $dispenseQuery);
        }

        // 3. 執行分頁 (使用獨立的 pageName)
        $perPage = $request->input('per_page', 10);
        $data['orders'] = $ordersQuery->latest()->paginate($perPage, ['*'], 'orders_page')->withQueryString();
        $data['invoices'] = $invoicesQuery->latest()->paginate($perPage, ['*'], 'invoices_page')->withQueryString();
        $data['dispenseLogs'] = $dispenseQuery->latest()->paginate($perPage, ['*'], 'dispense_page')->withQueryString();

        if ($isAjax) {
            return response()->json([
                'success' => true,
                'tab' => $tab,
                'html' => view('admin.sales.partials.tab-' . $tab, $data)->render()
            ]);
        }

        return view('admin.sales.index', $data);
    }

    /**
     * 取得單筆交易詳情 (用於 Slide-over)
     */
    public function show(Order $order)
    {
        $order->load([
            'machine', 
            'invoice', 
            'items', 
            'dispenseRecords.product', 
            'staffCardLog:id,order_id,staff_card_id',
            'staffCardLog.staffCard:id,employee_id,name,card_uid'
        ]);
        
        return response()->json([
            'success' => true,
            'html' => view('admin.sales.partials.order-detail-panel', [
                'order' => $order,
                'paymentTypes' => Order::getPaymentTypeLabels()
            ])->render()
        ]);
    }

    // 取貨碼設定
    public function pickupCodes(Request $request)
    {
        $tab = $request->input('tab', 'list');
        $isAjax = $request->ajax();

        $data = [
            'title' => '取貨碼設定',
            'description' => '產生與管理商品取貨驗證碼',
            'tab' => $tab,
        ];

        // 1. 取貨碼列表 (list)
        if (!$isAjax || $tab === 'list') {
            $query = PickupCode::with(['machine.slots.product', 'creator', 'order'])->latest();

            if ($request->search) {
                $query->where(function ($q) use ($request) {
                    $q->where('code', 'like', "%{$request->search}%")
                        ->orWhereHas('machine', function ($mq) use ($request) {
                            $mq->where('name', 'like', "%{$request->search}%")
                                ->orWhere('serial_no', 'like', "%{$request->search}%");
                        });
                });
            }

            if ($request->status && trim($request->status) !== '') {
                $query->where('status', trim($request->status));
            }

            $per_page = $request->input('per_page', 10);
            $data['pickupCodes'] = $query->paginate($per_page, ['*'], 'list_page')->withQueryString();
            
            // 供新增彈窗使用的機台清單
            $data['machines'] = Machine::all();
        }

        // 2. 操作紀錄 (logs)
        if (!$isAjax || $tab === 'logs') {
            $logQuery = PickupCodeLog::with(['user:id,name', 'machine:id,name,serial_no', 'pickupCode', 'order']);

            if ($request->filled('search_log')) {
                $search = $request->input('search_log');
                $logQuery->where(function ($q) use ($search) {
                    $q->where('remark', 'like', "%{$search}%")
                      ->orWhereHas('pickupCode', function($pq) use ($search) {
                          $pq->where('code', 'like', "%{$search}%");
                      });
                });
            }

            // 新增：類型篩選
            if ($request->filled('action')) {
                $logQuery->where('action', $request->action);
            }

            // 新增：日期區間篩選 (隱含 6 個月限制)
            $startDate = $request->input('start_date');
            $endDate = $request->input('end_date');

            if (!$startDate && !$endDate) {
                $logQuery->where('created_at', '>=', now()->subMonths(6));
            } else {
                try {
                    if ($startDate) {
                        $logQuery->where('created_at', '>=', \Carbon\Carbon::parse($startDate)->startOfMinute());
                    }
                    if ($endDate) {
                        $logQuery->where('created_at', '<=', \Carbon\Carbon::parse($endDate)->endOfMinute());
                    }
                } catch (\Exception $e) { }
            }

            $data['logs'] = $logQuery->latest()
                ->paginate($request->input('per_page', 10), ['*'], 'log_page')
                ->withQueryString();

            // 定義可用動作
            $data['actions'] = [
                'create' => __('create'),
                'update' => __('update'),
                'cancel' => __('cancel'),
                'used' => __('used'),
                'consume' => __('consume'),
                'consume_failed' => __('consume_failed'),
                'verify_success' => __('verify_success'),
            ];
        }

        if ($isAjax) {
            return response()->json([
                'success' => true,
                'tab' => $tab,
                'html' => view('admin.sales.pickup-codes.partials.tab-' . $tab, $data)->render()
            ]);
        }

        return view('admin.sales.pickup-codes.index', $data);
    }

    /**
     * 產生取貨碼
     */
    public function storePickupCode(Request $request)
    {
        $validated = $request->validate([
            'machine_id' => 'required|exists:machines,id',
            'slot_no' => 'required|string',
            'usage_limit' => 'nullable|integer|min:1|max:20',
            'expires_hours' => 'nullable|integer|min:1|max:720', 
            'expires_at' => 'nullable|date|after:now',
            'custom_code' => 'nullable|string|min:4|max:12',
        ]);

        $machine = Machine::findOrFail($validated['machine_id']);
        
        // 處理過期時間：優先使用直接傳入的日期，否則使用時數計算
        $expiresAt = $request->filled('expires_at') 
            ? Carbon::parse($validated['expires_at']) 
            : now()->addHours((int) ($request->expires_hours ?? 24));

        $pickupCode = PickupCode::create([
            'machine_id' => $validated['machine_id'],
            'slot_no' => $validated['slot_no'],
            'code' => $request->custom_code ?? PickupCode::generateUniqueCode($validated['machine_id']),
            'usage_limit' => $validated['usage_limit'] ?? 1,
            'usage_count' => 0,
            'expires_at' => $expiresAt,
            'status' => 'active',
            'company_id' => $machine->company_id,
            'created_by' => Auth::id(),
        ]);

        SystemOperationLog::create([
            'company_id' => $machine->company_id,
            'user_id' => Auth::id(),
            'module' => 'pickup_code',
            'action' => 'create',
            'target_id' => $pickupCode->id,
            'target_type' => PickupCode::class,
            'new_values' => $pickupCode->toArray(),
        ]);

        return back()->with('success', __('Pickup code generated: :code', ['code' => $pickupCode->code]));
    }

    /**
     * 更新取貨碼 (僅限修改時間)
     */
    public function updatePickupCode(Request $request, PickupCode $pickupCode)
    {
        $validated = $request->validate([
            'expires_at' => 'nullable|date|after:now',
            'usage_limit' => 'nullable|integer|min:1|max:20',
        ]);

        $oldValues = $pickupCode->toArray();

        $pickupCode->update(array_filter([
            'expires_at' => $validated['expires_at'] ?? null,
            'usage_limit' => $validated['usage_limit'] ?? null,
        ]));

        SystemOperationLog::create([
            'company_id' => $pickupCode->company_id,
            'user_id' => Auth::id(),
            'module' => 'pickup_code',
            'action' => 'update',
            'target_id' => $pickupCode->id,
            'target_type' => PickupCode::class,
            'old_values' => $oldValues,
            'new_values' => $pickupCode->toArray(),
        ]);

        return back()->with('success', __('Pickup code updated.'));
    }

    /**
     * 刪除/取消取貨碼
     */
    public function destroyPickupCode(PickupCode $pickupCode)
    {
        $oldValues = $pickupCode->toArray();
        $pickupCode->update(['status' => 'cancelled']);

        SystemOperationLog::create([
            'company_id' => $pickupCode->company_id,
            'user_id' => Auth::id(),
            'module' => 'pickup_code',
            'action' => 'cancel',
            'target_id' => $pickupCode->id,
            'target_type' => PickupCode::class,
            'old_values' => $oldValues,
            'new_values' => $pickupCode->toArray(),
        ]);

        return back()->with('success', __('Pickup code cancelled.'));
    }

    // 購買單
    public function orders()
    {
        return view('admin.placeholder', [
            'title' => '購買單',
            'description' => '購買訂單管理',
        ]);
    }

    // 促銷時段設定
    public function promotions()
    {
        return view('admin.placeholder', [
            'title' => '促銷時段設定',
            'description' => '促銷活動時間設定',
        ]);
    }

    // 通行碼設定
    public function passCodes(Request $request)
    {
        $tab = $request->input('tab', 'list');
        $isAjax = $request->ajax();

        $data = [
            'title' => '通行碼設定',
            'description' => '特殊通行權限碼管理 (測試/補貨用)',
            'tab' => $tab,
        ];

        // 1. 通行碼列表 (list)
        if (!$isAjax || $tab === 'list') {
            $query = PassCode::with(['machine', 'creator'])->latest();

            if ($request->search) {
                $query->where(function ($q) use ($request) {
                    $q->where('code', 'like', "%{$request->search}%")
                        ->orWhere('name', 'like', "%{$request->search}%")
                        ->orWhereHas('machine', function ($mq) use ($request) {
                            $mq->where('name', 'like', "%{$request->search}%")
                                ->orWhere('serial_no', 'like', "%{$request->search}%");
                        });
                });
            }

            if ($request->status && trim($request->status) !== '') {
                $status = trim($request->status);
                if ($status === 'active') {
                    $query->where('status', 'active')
                        ->where(function ($q) {
                            $q->whereNull('expires_at')
                                ->orWhere('expires_at', '>', now());
                        });
                } elseif ($status === 'expired') {
                    $query->where('status', 'active')
                        ->whereNotNull('expires_at')
                        ->where('expires_at', '<=', now());
                } else {
                    $query->where('status', $status);
                }
            }

            $data['passCodes'] = $query->paginate($request->input('per_page', 10), ['*'], 'list_page')->withQueryString();
            $data['machines'] = Machine::all();
        }

        // 2. 操作紀錄 (logs)
        if (!$isAjax || $tab === 'logs') {
            $logQuery = PassCodeLog::with(['user:id,name', 'machine:id,name,serial_no', 'passCode']);

            if ($request->filled('search_log')) {
                $search = $request->input('search_log');
                $logQuery->where(function ($q) use ($search) {
                    $q->where('remark', 'like', "%{$search}%")
                      ->orWhereHas('passCode', function($pq) use ($search) {
                          $pq->where('code', 'like', "%{$search}%")
                            ->orWhere('name', 'like', "%{$search}%");
                      });
                });
            }

            // 新增：類型篩選
            if ($request->filled('action')) {
                $logQuery->where('action', $request->action);
            }

            // 新增：日期區間篩選 (隱含 6 個月限制)
            $startDate = $request->input('start_date');
            $endDate = $request->input('end_date');

            if (!$startDate && !$endDate) {
                $logQuery->where('created_at', '>=', now()->subMonths(6));
            } else {
                try {
                    if ($startDate) {
                        $logQuery->where('created_at', '>=', \Carbon\Carbon::parse($startDate)->startOfMinute());
                    }
                    if ($endDate) {
                        $logQuery->where('created_at', '<=', \Carbon\Carbon::parse($endDate)->endOfMinute());
                    }
                } catch (\Exception $e) { }
            }

            $data['logs'] = $logQuery->latest()
                ->paginate($request->input('per_page', 10), ['*'], 'log_page')
                ->withQueryString();

            // 定義可用動作
            $data['actions'] = [
                'create' => __('create'),
                'update' => __('update'),
                'cancel' => __('cancel'),
                'used' => __('used'),
                'consume' => __('consume'),
                'verify_success' => __('verify_success'),
            ];
        }

        if ($isAjax) {
            return response()->json([
                'success' => true,
                'tab' => $tab,
                'html' => view('admin.sales.pass-codes.partials.tab-' . $tab, $data)->render()
            ]);
        }

        return view('admin.sales.pass-codes.index', $data);
    }

    /**
     * 產生通行碼
     */
    public function storePassCode(Request $request)
    {
        $validated = $request->validate([
            'machine_id' => 'required|exists:machines,id',
            'name' => 'required|string|max:50',
            'expires_days' => 'nullable|integer|min:0',
            'custom_code' => 'required|string|min:4|max:12',
        ]);

        $machine = Machine::findOrFail($validated['machine_id']);
        $expiresAt = $request->expires_days ? now()->addDays((int) $request->expires_days) : null;

        $passCode = PassCode::create([
            'machine_id' => $validated['machine_id'],
            'name' => $validated['name'] ?? 'Manual Generate',
            'code' => $validated['custom_code'] ?? PassCode::generateUniqueCode($validated['machine_id']),
            'expires_at' => $expiresAt,
            'status' => 'active',
            'company_id' => $machine->company_id,
            'created_by' => Auth::id(),
        ]);

        SystemOperationLog::create([
            'company_id' => $machine->company_id,
            'user_id' => Auth::id(),
            'module' => 'pass_code',
            'action' => 'create',
            'target_id' => $passCode->id,
            'target_type' => PassCode::class,
            'new_values' => $passCode->toArray(),
        ]);

        return back()->with('success', __('Pass code created: :code', ['code' => $passCode->code]));
    }

    /**
     * 更新通行碼
     */
    public function updatePassCode(Request $request, PassCode $passCode)
    {
        $validated = $request->validate([
            'name' => 'nullable|string|max:50',
            'expires_at' => 'nullable|date',
            'status' => 'nullable|in:active,disabled',
        ]);

        // 確保 expires_at 為空字串時轉為 null
        if (isset($validated['expires_at']) && empty($validated['expires_at'])) {
            $validated['expires_at'] = null;
        }

        $oldValues = $passCode->toArray();

        $passCode->update(array_filter($validated, function ($value, $key) use ($request) {
            return $request->has($key);
        }, ARRAY_FILTER_USE_BOTH));

        SystemOperationLog::create([
            'company_id' => $passCode->company_id,
            'user_id' => Auth::id(),
            'module' => 'pass_code',
            'action' => 'update',
            'target_id' => $passCode->id,
            'target_type' => PassCode::class,
            'old_values' => $oldValues,
            'new_values' => $passCode->toArray(),
        ]);

        return back()->with('success', __('Pass code updated.'));
    }

    /**
     * 刪除通行碼 (改為停用)
     */
    public function destroyPassCode(PassCode $passCode)
    {
        $oldValues = $passCode->toArray();
        $passCode->update(['status' => 'disabled']);

        SystemOperationLog::create([
            'company_id' => $passCode->company_id,
            'user_id' => Auth::id(),
            'module' => 'pass_code',
            'action' => 'cancel',
            'target_id' => $passCode->id,
            'target_type' => PassCode::class,
            'old_values' => $oldValues,
            'new_values' => $passCode->toArray(),
        ]);

        return back()->with('success', __('Pass code cancelled.'));
    }

    // 來店禮設定
    public function storeGifts()
    {
        return view('admin.placeholder', [
            'title' => '來店禮設定',
            'description' => '來店優惠活動設定',
        ]);
    }

    /**
     * 處理銷售中心資料匯出 (CSV 串流下載)
     */
    private function handleExport($tab, $type, $ordersQuery, $invoicesQuery, $dispenseQuery)
    {
        $isExcel = ($type === 'excel');
        $ext = $isExcel ? 'xls' : 'csv';
        $contentType = $isExcel ? 'application/vnd.ms-excel; charset=utf-8' : 'text/csv; charset=utf-8';

        $filename = '';
        $headers = [];
        $callback = null;

        if ($tab === 'orders') {
            $filename = '交易紀錄_' . now()->format('YmdHis') . '.' . $ext;
            $headers = [
                __('Order Number'),
                __('Transaction Time'),
                __('Machine Name'),
                __('Machine Serial No'),
                __('Product Items'),
                __('Quantity'),
                __('Original Amount'),
                __('Discount Amount'),
                __('Payment Amount'),
                __('Payment Type'),
                __('Status'),
                __('Invoice Number'),
                __('Staff Name'),
                __('Staff ID'),
                __('Card UID'),
            ];

            // 預先載入關聯以防 N+1
            $ordersQuery->with([
                'machine:id,name,serial_no',
                'invoice:id,order_id,invoice_no',
                'items:id,order_id,product_name,quantity',
                'staffCardLog:id,order_id,staff_card_id',
                'staffCardLog.staffCard:id,employee_id,name,card_uid'
            ]);

            $callback = function () use ($ordersQuery, $headers, $isExcel) {
                $file = fopen('php://output', 'w');
                if ($isExcel) {
                    fwrite($file, '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">');
                    fwrite($file, '<head><meta charset="utf-8"/><style>table { border-collapse: collapse; } th, td { border: 1px solid #cbd5e1; padding: 8px 12px; text-align: left; } th { background-color: #f1f5f9; font-weight: bold; }</style></head><body>');
                    fwrite($file, '<table><thead><tr>');
                    foreach ($headers as $header) {
                        fwrite($file, '<th>' . htmlspecialchars($header) . '</th>');
                    }
                    fwrite($file, '</tr></thead><tbody>');
                } else {
                    fwrite($file, "\xEF\xBB\xBF"); // 注入 UTF-8 BOM
                    fputcsv($file, $headers);
                }

                // 分批 (Chunk) 查詢，每次 500 筆，確保常數記憶體用量
                $ordersQuery->latest()->chunk(500, function ($orders) use ($file, $isExcel) {
                    foreach ($orders as $order) {
                        $productSummary = $order->items->map(function ($item) {
                            return $item->product_name . ' x' . number_format($item->quantity, 0);
                        })->implode(', ');

                        $totalQty = $order->items->sum('quantity');

                        $row = [
                            $order->order_no,
                            $order->created_at->format('Y-m-d H:i:s'),
                            $order->machine->name ?? 'Unknown',
                            $order->machine->serial_no ?? '---',
                            $productSummary ?: '---',
                            $totalQty,
                            number_format($order->total_amount, 2, '.', ''),
                            number_format($order->discount_amount, 2, '.', ''),
                            number_format($order->pay_amount, 2, '.', ''),
                            $order->payment_type_label,
                            __($order->status),
                            $order->invoice->invoice_no ?? '---',
                            $order->staffCardLog->staffCard->name ?? '---',
                            $order->staffCardLog->staffCard->employee_id ?? '---',
                            $order->staffCardLog->staffCard->card_uid ?? '---',
                        ];

                        if ($isExcel) {
                            fwrite($file, '<tr>');
                            foreach ($row as $val) {
                                fwrite($file, '<td>' . htmlspecialchars($val) . '</td>');
                            }
                            fwrite($file, '</tr>');
                        } else {
                            fputcsv($file, $row);
                        }
                    }
                });

                if ($isExcel) {
                    fwrite($file, '</tbody></table></body></html>');
                }
                fclose($file);
            };
        } elseif ($tab === 'invoices') {
            $filename = '電子發票紀錄_' . now()->format('YmdHis') . '.' . $ext;
            $headers = [
                __('Invoice Number'),
                __('Invoice Date'),
                __('Flow ID'),
                __('Machine Name'),
                __('Machine Serial No'),
                __('Associated Order'),
                __('Amount'),
                __('Status'),
            ];

            // 預先載入關聯
            $invoicesQuery->with([
                'machine:id,name,serial_no',
                'order:id,order_no'
            ]);

            $callback = function () use ($invoicesQuery, $headers, $isExcel) {
                $file = fopen('php://output', 'w');
                if ($isExcel) {
                    fwrite($file, '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">');
                    fwrite($file, '<head><meta charset="utf-8"/><style>table { border-collapse: collapse; } th, td { border: 1px solid #cbd5e1; padding: 8px 12px; text-align: left; } th { background-color: #f1f5f9; font-weight: bold; }</style></head><body>');
                    fwrite($file, '<table><thead><tr>');
                    foreach ($headers as $header) {
                        fwrite($file, '<th>' . htmlspecialchars($header) . '</th>');
                    }
                    fwrite($file, '</tr></thead><tbody>');
                } else {
                    fwrite($file, "\xEF\xBB\xBF");
                    fputcsv($file, $headers);
                }

                $invoicesQuery->latest()->chunk(500, function ($invoices) use ($file, $isExcel) {
                    foreach ($invoices as $inv) {
                        // 狀態判斷邏輯需與 tab-invoices.blade.php 完全一致
                        $status = 'valid';
                        if (empty($inv->invoice_no)) $status = 'failed';
                        if ($inv->rtn_code === 'void') $status = 'void';

                        $statusMap = [
                            'valid' => __('Valid'),
                            'void' => __('Void'),
                            'failed' => __('Failed'),
                            'refunded' => __('Refunded'),
                        ];
                        $statusLabel = $statusMap[$status] ?? $status;

                        $row = [
                            $inv->invoice_no ?: '---',
                            $inv->invoice_date ?: '---',
                            $inv->flow_id ?: '---',
                            $inv->machine->name ?? ($inv->order->machine->name ?? 'Unknown'),
                            $inv->machine->serial_no ?? ($inv->order->machine->serial_no ?? '---'),
                            $inv->order->order_no ?? '---',
                            number_format($inv->amount, 2, '.', ''),
                            $statusLabel,
                        ];

                        if ($isExcel) {
                            fwrite($file, '<tr>');
                            foreach ($row as $val) {
                                fwrite($file, '<td>' . htmlspecialchars($val) . '</td>');
                            }
                            fwrite($file, '</tr>');
                        } else {
                            fputcsv($file, $row);
                        }
                    }
                });

                if ($isExcel) {
                    fwrite($file, '</tbody></table></body></html>');
                }
                fclose($file);
            };
        } elseif ($tab === 'dispense') {
            $filename = '遠端出貨紀錄_' . now()->format('YmdHis') . '.' . $ext;
            $headers = [
                __('Machine'),
                __('Machine Serial No'),
                __('Product Name'),
                __('Slot No'),
                __('Amount'),
                __('Dispense Status'),
                __('Dispense Time'),
                __('Associated Order'),
            ];

            // 預先載入關聯
            $dispenseQuery->with([
                'machine:id,name,serial_no',
                'product:id,name',
                'order:id,order_no'
            ]);

            $callback = function () use ($dispenseQuery, $headers, $isExcel) {
                $file = fopen('php://output', 'w');
                if ($isExcel) {
                    fwrite($file, '<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns="http://www.w3.org/TR/REC-html40">');
                    fwrite($file, '<head><meta charset="utf-8"/><style>table { border-collapse: collapse; } th, td { border: 1px solid #cbd5e1; padding: 8px 12px; text-align: left; } th { background-color: #f1f5f9; font-weight: bold; }</style></head><body>');
                    fwrite($file, '<table><thead><tr>');
                    foreach ($headers as $header) {
                        fwrite($file, '<th>' . htmlspecialchars($header) . '</th>');
                    }
                    fwrite($file, '</tr></thead><tbody>');
                } else {
                    fwrite($file, "\xEF\xBB\xBF");
                    fputcsv($file, $headers);
                }

                $dispenseQuery->latest()->chunk(500, function ($logs) use ($file, $isExcel) {
                    foreach ($logs as $log) {
                        // 出貨狀態對照，需與 tab-dispense.blade.php 完全一致
                        $statusMap = [
                            'success' => __('Dispense Success'),
                            'failed' => __('Dispense Failed'),
                            'pending' => __('Dispense Pending'),
                            '1' => __('Dispense Success'),
                            '0' => __('Dispense Failed'),
                        ];
                        $statusKey = (string)($log->dispense_status ?? 'pending');
                        $statusLabel = $statusMap[$statusKey] ?? $statusKey;

                        $row = [
                            $log->machine->name ?? 'Unknown',
                            $log->machine->serial_no ?? '---',
                            $log->product->name ?? 'Unknown Product',
                            $log->slot_no,
                            number_format($log->amount, 2, '.', ''),
                            $statusLabel,
                            $log->machine_time ? $log->machine_time->format('Y-m-d H:i:s') : '---',
                            $log->order->order_no ?? '---',
                        ];

                        if ($isExcel) {
                            fwrite($file, '<tr>');
                            foreach ($row as $val) {
                                fwrite($file, '<td>' . htmlspecialchars($val) . '</td>');
                            }
                            fwrite($file, '</tr>');
                        } else {
                            fputcsv($file, $row);
                        }
                    }
                });

                if ($isExcel) {
                    fwrite($file, '</tbody></table></body></html>');
                }
                fclose($file);
            };
        }

        if ($callback) {
            return response()->streamDownload($callback, $filename, [
                'Content-Type' => $contentType,
                'Cache-Control' => 'no-cache, must-revalidate',
                'Pragma' => 'no-cache',
                'Expires' => '0',
            ]);
        }

        return redirect()->back();
    }
}