<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Models\Order;
use App\Models\OrderItem;
use App\Models\MarkList;
use App\Models\Invoice;
use App\Models\InvoiceItem;
use App\Models\User;
use PDF;
use Maatwebsite\Excel\Facades\Excel;
use App\Exports\OrdersExport;

class AdminOrderController extends Controller
{
    /* ---------------------------
     * LIST / DASHBOARD
     * ---------------------------*/
    public function index()
    {
        $orders   = Order::latest()->get();
        $markList = MarkList::where('status', 'active')->get();

        return view('admin.dashboard', compact('orders', 'markList'));
    }

    /* ---------------------------
     * CREATE NEW ORDER (simple page)
     * ---------------------------*/
    public function create()
    {
        $markList = MarkList::where('status', 'active')->get();
        return view('admin.orders_create', compact('markList'));
    }

    public function store(Request $request)
    {
        $data = $request->validate([
            'mark_no'     => 'required|string',
            'origin'      => 'nullable|string',
            'destination' => 'nullable|string',
            'ctn'         => 'nullable|numeric',
            'qty'         => 'nullable|numeric',
            'ttl_qty'     => 'nullable|numeric',
            'ttl_amount'  => 'nullable|numeric',
            'cbm'         => 'nullable|numeric',
            'ttl_cbm'     => 'nullable|numeric',
            'kg'          => 'nullable|numeric',
            'ttl_kg'      => 'nullable|numeric',
        ]);

        $order = Order::create([
            'order_id'   => $this->generateOrderId(),
            'mark_no'    => $data['mark_no'],
            'origin'     => $data['origin'] ?? null,
            'destination'=> $data['destination'] ?? null,
            'ctn'        => $data['ctn'] ?? 0,
            'qty'        => $data['qty'] ?? 0,
            'ttl_qty'    => $data['ttl_qty'] ?? 0,
            'ttl_amount' => $data['ttl_amount'] ?? 0,
            'cbm'        => $data['cbm'] ?? 0,
            'ttl_cbm'    => $data['ttl_cbm'] ?? 0,
            'kg'         => $data['kg'] ?? 0,
            'ttl_kg'     => $data['ttl_kg'] ?? 0,
            'status'     => 'pending',
        ]);

        $this->createInvoice($order);

        return redirect()->route('admin.orders.show', $order->id)
            ->with('success', 'Order created successfully.');
    }

    /* ---------------------------
     * SHOW / POPUP
     * ---------------------------*/
    public function show($id)
    {
        $order = Order::with('items', 'markList')->findOrFail($id);
        $user  = $this->getCustomerFromOrder($order);

        return view('admin.orders_show', compact('order', 'user'));
    }

    public function popup($id)
    {
        $order = Order::with(['items', 'markList'])->findOrFail($id);

        $user = null;
        if ($order->markList && $order->markList->customer_id) {
            $user = User::where('customer_id', $order->markList->customer_id)->first();
        }

        return view('admin.popup', compact('order', 'user'));
    }

    /* ---------------------------
     * ORDER ITEM MANAGEMENT (existing orders)
     * ---------------------------*/
    public function addItem(Request $request, $orderId)
    {
        $order = Order::findOrFail($orderId);

        $data = $request->validate([
            'description' => 'required|string',
            'ctn'         => 'nullable|numeric',
            'qty'         => 'nullable|numeric',
            'ttl_qty'     => 'nullable|numeric',
            'unit'        => 'nullable|string',
            'price'       => 'nullable|numeric',
            'ttl_amount'  => 'nullable|numeric',
            'cbm'         => 'nullable|numeric',
            'ttl_cbm'     => 'nullable|numeric',
            'kg'          => 'nullable|numeric',
            'ttl_kg'      => 'nullable|numeric',
            'shop_no'     => 'nullable|string',
        ]);

        $data['order_id'] = $order->id;

        OrderItem::create($data);

        $this->recalcTotals($order);
        $this->updateInvoiceFromOrder($order);

        return redirect()->back()->with('success', 'Item added and totals updated.');
    }

    public function deleteItem($id)
    {
        $item  = OrderItem::findOrFail($id);
        $order = $item->order;

        $item->delete();

        $this->recalcTotals($order);
        $this->updateInvoiceFromOrder($order);

        return redirect()->back()->with('success', 'Item deleted and totals updated.');
    }

    public function restoreItem($id)
    {
        $item  = OrderItem::withTrashed()->findOrFail($id);
        $order = Order::findOrFail($item->order_id);

        $item->restore();

        $this->recalcTotals($order);
        $this->updateInvoiceFromOrder($order);

        return redirect()->back()->with('success', 'Item restored and totals updated.');
    }

    /* ---------------------------
     * ORDER CRUD: update / destroy
     * ---------------------------*/
    public function update(Request $request, $id)
    {
        $order = Order::findOrFail($id);

        $data = $request->validate([
            'mark_no'     => 'required|string',
            'origin'      => 'nullable|string',
            'destination' => 'nullable|string',
        ]);

        $order->update([
            'mark_no'     => $data['mark_no'],
            'origin'      => $data['origin'] ?? null,
            'destination' => $data['destination'] ?? null,
        ]);

        $this->recalcTotals($order);

        return redirect()->route('admin.orders.show', $order->id)
            ->with('success', 'Order updated successfully.');
    }

    public function destroy($id)
    {
        $order = Order::findOrFail($id);

        OrderItem::where('order_id', $order->id)->delete();
        $order->delete();

        return redirect()->route('admin.orders.index')
            ->with('success', 'Order deleted successfully.');
    }

    /* ---------------------------
     * HELPERS
     * ---------------------------*/
    private function recalcTotals(Order $order)
    {
        $items = $order->items()->get();

        $order->update([
            'ctn'        => (int) $items->sum(fn($i) => (int) ($i->ctn ?? 0)),
            'qty'        => (int) $items->sum(fn($i) => (int) ($i->qty ?? 0)),
            'ttl_qty'    => (int) $items->sum(fn($i) => (int) ($i->ttl_qty ?? 0)),
            'ttl_amount' => (float) $items->sum(fn($i) => (float) ($i->ttl_amount ?? 0)),
            'cbm'        => (float) $items->sum(fn($i) => (float) ($i->cbm ?? 0)),
            'ttl_cbm'    => (float) $items->sum(fn($i) => (float) ($i->ttl_cbm ?? 0)),
            'kg'         => (float) $items->sum(fn($i) => (float) ($i->kg ?? 0)),
            'ttl_kg'     => (float) $items->sum(fn($i) => (float) ($i->ttl_kg ?? 0)),
        ]);
    }

    private function generateOrderId()
    {
        $year   = date('y');
        $prefix = "KNT-$year-";

        $lastOrder  = Order::latest('id')->first();
        $nextNumber = $lastOrder ? intval(substr($lastOrder->order_id, -8)) + 1 : 1;

        return $prefix . str_pad($nextNumber, 8, '0', STR_PAD_LEFT);
    }

    /* ---------------------------
     * INVOICE CREATION HELPERS
     * ---------------------------*/
    private function createInvoice(Order $order)
    {
        $invoiceNumber = $this->generateInvoiceNumber();
        $customer      = $this->getCustomerFromMarkList($order->mark_no);
        $totalAmount   = $order->ttl_amount;

        $invoice = Invoice::create([
            'order_id'              => $order->id,
            'customer_id'           => $customer->id ?? null,
            'mark_no'               => $order->mark_no,
            'invoice_number'        => $invoiceNumber,
            'invoice_date'          => now(),
            'due_date'              => now()->addDays(10),
            'payment_method'        => null,
            'reference_no'          => null,
            'status'                => 'pending',
            'final_amount'          => $totalAmount,
            'gst_percent'           => 0,
            'gst_amount'            => 0,
            'final_amount_with_gst' => $totalAmount,
            'customer_name'         => $customer->customer_name ?? null,
            'company_name'          => $customer->company_name ?? null,
            'customer_email'        => $customer->email ?? null,
            'customer_mobile'       => $customer->mobile_no ?? null,
            'customer_address'      => $customer->address ?? null,
            'pincode'               => $customer->pincode ?? null,
            'notes'                 => null,
            'pdf_path'              => null,
        ]);

        foreach ($order->items as $item) {
            InvoiceItem::create([
                'invoice_id'  => $invoice->id,
                'description' => $item->description,
                'ctn'         => $item->ctn,
                'qty'         => $item->qty,
                'ttl_qty'     => $item->ttl_qty,
                'unit'        => $item->unit,
                'price'       => $item->price,
                'ttl_amount'  => $item->ttl_amount,
                'cbm'         => $item->cbm,
                'ttl_cbm'     => $item->ttl_cbm,
                'kg'          => $item->kg,
                'ttl_kg'      => $item->ttl_kg,
                'shop_no'     => $item->shop_no,
            ]);
        }
    }

    private function generateInvoiceNumber()
    {
        $lastInvoice = Invoice::latest()->first();
        $nextInvoice = $lastInvoice ? $lastInvoice->id + 1 : 1;

        return 'INV-' . date('Y') . '-' . str_pad($nextInvoice, 6, '0', STR_PAD_LEFT);
    }

    private function getCustomerFromMarkList($markNo)
    {
        $markList = MarkList::where('mark_no', $markNo)->first();

        if ($markList && $markList->customer_id) {
            return User::where('customer_id', $markList->customer_id)->first();
        }

        return null;
    }

    private function getCustomerFromOrder($order)
    {
        if ($order->markList && $order->markList->customer_id) {
            return User::where('customer_id', $order->markList->customer_id)->first();
        }

        return null;
    }

    /* ---------------------------
     * SEE (detailed)
     * ---------------------------*/
    public function see($id)
    {
        $order = Order::with([
            'markList',
            'items',
            'invoice.items',
            'shipments' => function ($q) use ($id) {
                $q->whereHas('orders', function ($oq) use ($id) {
                    $oq->where('orders.id', $id)
                       ->whereNull('orders.deleted_at');
                })->with([
                    'orders' => function ($oq) use ($id) {
                        $oq->where('orders.id', $id)
                           ->whereNull('orders.deleted_at')
                           ->with('items');
                    }
                ]);
            }
        ])->findOrFail($id);

        $orderData = [
            'order_id' => $order->order_id,
            'status'   => $order->status,
            'totals'   => [
                'ctn'     => $order->ctn,
                'qty'     => $order->qty,
                'ttl_qty' => $order->ttl_qty,
                'cbm'     => $order->cbm,
                'ttl_cbm' => $order->ttl_cbm,
                'kg'      => $order->kg,
                'ttl_kg'  => $order->ttl_kg,
                'amount'  => $order->ttl_amount,
            ],
            'items' => $order->items,
        ];

        $shipmentsData = [];
        foreach ($order->shipments as $shipment) {
            $shipmentOrders = [];
            $totals = [
                'ctn' => 0, 'qty' => 0, 'ttl_qty' => 0,
                'cbm' => 0, 'ttl_cbm' => 0,
                'kg'  => 0, 'ttl_kg'  => 0,
                'amount' => 0,
            ];

            foreach ($shipment->orders as $shipOrder) {
                foreach ($shipOrder->items as $item) {
                    $shipmentOrders[] = [
                        'order_id'    => $shipOrder->order_id,
                        'origin'      => $shipOrder->origin,
                        'destination' => $shipOrder->destination,
                        'description' => $item->description,
                        'ctn'         => $item->ctn,
                        'qty'         => $item->qty,
                        'ttl_qty'     => $item->ttl_qty,
                        'amount'      => $item->ttl_amount,
                    ];

                    $totals['ctn']     += $item->ctn;
                    $totals['qty']     += $item->qty;
                    $totals['ttl_qty'] += $item->ttl_qty;
                    $totals['cbm']     += $item->cbm;
                    $totals['ttl_cbm'] += $item->ttl_cbm;
                    $totals['kg']      += $item->kg;
                    $totals['ttl_kg']  += $item->ttl_kg;
                    $totals['amount']  += $item->ttl_amount;
                }
            }

            if (empty($shipmentOrders)) {
                continue;
            }

            $shipmentsData[] = [
                'shipment_id'  => $shipment->shipment_id,
                'status'       => $shipment->status,
                'date'         => $shipment->shipment_date,
                'total_orders' => 1,
                'orders'       => $shipmentOrders,
                'totals'       => $totals,
            ];
        }

        $invoiceData = null;
        if ($order->invoice) {
            $invoice = $order->invoice;
            $invoiceData = [
                'invoice_no'   => $invoice->invoice_number,
                'status'       => $invoice->status,
                'invoice_date' => $invoice->invoice_date,
                'due_date'     => $invoice->due_date,
                'customer'     => [
                    'name'    => $invoice->customer_name,
                    'mobile'  => $invoice->customer_mobile,
                    'email'   => $invoice->customer_email,
                    'address' => $invoice->customer_address,
                    'pincode' => $invoice->pincode,
                ],
                'items'   => $invoice->items,
                'summary' => [
                    'amount' => $invoice->final_amount,
                    'cgst'   => 0,
                    'sgst'   => 0,
                    'total'  => $invoice->final_amount_with_gst,
                ],
            ];
        }

        return view('admin.see_order', compact(
            'order',
            'orderData',
            'shipmentsData',
            'invoiceData'
        ));
    }

    /* ---------------------------
     * FILTERED LIST + EXPORTS
     * ---------------------------*/
    public function orderShow()
    {
        $orders = Order::with([
            'markList',
            'shipments',
            'invoice'
        ])->latest('id')->get();

        return view('admin.orders', compact('orders'));
    }

    private function buildOrdersQueryFromRequest(Request $request)
    {
        $query = Order::query()
            ->with(['markList', 'invoice', 'shipments']);

        if ($request->filled('search')) {
            $search = trim($request->search);

            $query->where(function ($q) use ($search) {
                $q->where('orders.order_id', 'like', "%{$search}%")
                    ->orWhereHas('markList', function ($q2) use ($search) {
                        $q2->where('company_name', 'like', "%{$search}%")
                            ->orWhere('customer_id', 'like', "%{$search}%")
                            ->orWhere('origin', 'like', "%{$search}%")
                            ->orWhere('destination', 'like', "%{$search}%");
                    })
                    ->orWhereHas('invoice', function ($q3) use ($search) {
                        $q3->where('invoice_number', 'like', "%{$search}%");
                    })
                    ->orWhereHas('shipments', function ($q4) use ($search) {
                        $q4->where('shipments.shipment_id', 'like', "%{$search}%");
                    });
            });
        }

        if ($request->filled('status')) {
            $query->where(function ($q) use ($request) {
                $q->whereHas('invoice', function ($q2) use ($request) {
                    $q2->where('status', $request->status);
                })->orWhereDoesntHave('invoice');
            });
        }

        if ($request->filled('shipment')) {
            $query->where(function ($q) use ($request) {
                $q->whereHas('shipments', function ($q2) use ($request) {
                    $q2->where('status', $request->shipment);
                })->orWhereDoesntHave('shipments');
            });
        }

        if ($request->filled('from_date')) {
            $query->whereDate('orders.created_at', '>=', $request->from_date);
        }

        if ($request->filled('to_date')) {
            $query->whereDate('orders.created_at', '<=', $request->to_date);
        }

        return $query->latest('orders.id');
    }

    public function downloadPdf(Request $request)
    {
        $orders  = $this->buildOrdersQueryFromRequest($request)->get();
        $filters = [
            'search'   => $request->search,
            'status'   => $request->status,
            'shipment' => $request->shipment,
            'from'     => $request->from_date,
            'to'       => $request->to_date,
        ];

        $pdf = PDF::loadView('admin.orders.pdf', compact('orders', 'filters'))
            ->setPaper('a4', 'landscape');

        return $pdf->download(
            'orders-report-' . now()->format('Y-m-d') . '.pdf'
        );
    }

    public function downloadExcel(Request $request)
    {
        return Excel::download(
            new OrdersExport($request),
            'orders-report-' . now()->format('Y-m-d') . '.xlsx'
        );
    }

    /* --------------------------------------------------
     * NEW: Create Order + Invoice directly from popup
     * route: admin.orders.temp.add  (Create New Order form)
     * --------------------------------------------------*/
    public function addTempItem(Request $request)
    {
        // 1) order-level fields
        $request->validate([
            'mark_no'     => 'required',
            'origin'      => 'required',
            'destination' => 'required',
        ]);

        // 2) multi-row items
        $items = $request->validate([
            'items'                   => 'required|array',
            'items.*.description'     => 'required|string',
            'items.*.ctn'             => 'nullable|numeric',
            'items.*.qty'             => 'nullable|numeric',
            'items.*.ttl_qty'         => 'nullable|numeric',
            'items.*.unit'            => 'nullable|string',
            'items.*.price'           => 'nullable|numeric',
            'items.*.ttl_amount'      => 'nullable|numeric',
            'items.*.cbm'             => 'nullable|numeric',
            'items.*.ttl_cbm'         => 'nullable|numeric',
            'items.*.kg'              => 'nullable|numeric',
            'items.*.ttl_kg'          => 'nullable|numeric',
            'items.*.shop_no'         => 'nullable|string',
        ])['items'];

        // रिकामे rows काढा
        $items = array_filter($items, function ($row) {
            return trim($row['description'] ?? '') !== '';
        });

        if (empty($items)) {
            return back()->with('error', 'Add at least one item.');
        }

        // 3) totals
        $total_ctn      = array_sum(array_column($items, 'ctn'));
        $total_qty      = array_sum(array_column($items, 'qty'));
        $total_ttl_qty  = array_sum(array_column($items, 'ttl_qty'));
        $total_amount   = array_sum(array_column($items, 'ttl_amount'));
        $total_cbm      = array_sum(array_column($items, 'cbm'));
        $total_ttl_cbm  = array_sum(array_column($items, 'ttl_cbm'));
        $total_kg       = array_sum(array_column($items, 'kg'));
        $total_ttl_kg   = array_sum(array_column($items, 'ttl_kg'));

        // 4) order id generate
        $orderId = $this->generateOrderId();

        // 5) order create
        $order = Order::create([
            'order_id'   => $orderId,
            'mark_no'    => $request->mark_no,
            'origin'     => $request->origin,
            'destination'=> $request->destination,
            'ctn'        => $total_ctn,
            'qty'        => $total_qty,
            'ttl_qty'    => $total_ttl_qty,
            'ttl_amount' => $total_amount,
            'cbm'        => $total_cbm,
            'ttl_cbm'    => $total_ttl_cbm,
            'kg'         => $total_kg,
            'ttl_kg'     => $total_ttl_kg,
            'status'     => 'pending',
        ]);

        // 6) order items
        foreach ($items as $item) {
            OrderItem::create([
                'order_id'   => $order->id,
                'description'=> $item['description'],
                'ctn'        => $item['ctn'],
                'qty'        => $item['qty'],
                'ttl_qty'    => $item['ttl_qty'],
                'unit'       => $item['unit'],
                'price'      => $item['price'],
                'ttl_amount' => $item['ttl_amount'],
                'cbm'        => $item['cbm'],
                'ttl_cbm'    => $item['ttl_cbm'],
                'kg'         => $item['kg'],
                'ttl_kg'     => $item['ttl_kg'],
                'shop_no'    => $item['shop_no'],
            ]);
        }

        // 7) invoice number
        $invoiceNumber = $this->generateInvoiceNumber();

        // 8) customer fetch
        $markList = MarkList::where('mark_no', $order->mark_no)->first();
        $customer = null;
        if ($markList && $markList->customer_id) {
            $customer = User::where('customer_id', $markList->customer_id)->first();
        }

        // 9) invoice create
        $invoice = Invoice::create([
            'order_id'              => $order->id,
            'customer_id'           => $customer->id ?? null,
            'mark_no'               => $order->mark_no,
            'invoice_number'        => $invoiceNumber,
            'invoice_date'          => now(),
            'due_date'              => now()->addDays(10),
            'payment_method'        => null,
            'reference_no'          => null,
            'status'                => 'pending',
            'final_amount'          => $total_amount,
            'gst_percent'           => 0,
            'gst_amount'            => 0,
            'final_amount_with_gst' => $total_amount,
            'customer_name'         => $customer->customer_name ?? null,
            'company_name'          => $customer->company_name ?? null,
            'customer_email'        => $customer->email ?? null,
            'customer_mobile'       => $customer->mobile_no ?? null,
            'customer_address'      => $customer->address ?? null,
            'pincode'               => $customer->pincode ?? null,
            'notes'                 => null,
            'pdf_path'              => null,
        ]);

        // 10) invoice items
        foreach ($order->items as $item) {
            InvoiceItem::create([
                'invoice_id'  => $invoice->id,
                'description' => $item->description,
                'ctn'         => $item->ctn,
                'qty'         => $item->qty,
                'ttl_qty'     => $item->ttl_qty,
                'unit'        => $item->unit,
                'price'       => $item->price,
                'ttl_amount'  => $item->ttl_amount,
                'cbm'         => $item->cbm,
                'ttl_cbm'     => $item->ttl_cbm,
                'kg'          => $item->kg,
                'ttl_kg'      => $item->ttl_kg,
                'shop_no'     => $item->shop_no,
            ]);
        }

        return redirect()->route('admin.orders.index')
            ->with('success', 'Order + Invoice created successfully.');
    }

    /* ---------------------------
     * UPDATE ORDER ITEM (existing orders)
     * ---------------------------*/
    public function updateItem(Request $request, $id)
    {
        $item  = OrderItem::findOrFail($id);
        $order = $item->order;

        $item->update([
            'description' => $request->description,
            'ctn'         => $request->ctn,
            'qty'         => $request->qty,
            'ttl_qty'     => $request->ttl_qty,
            'unit'        => $request->unit,
            'price'       => $request->price,
            'ttl_amount'  => $request->ttl_amount,
            'cbm'         => $request->cbm,
            'ttl_cbm'     => $request->ttl_cbm,
            'kg'          => $request->kg,
            'ttl_kg'      => $request->ttl_kg,
            'shop_no'     => $request->shop_no,
        ]);

        $this->recalcTotals($order);
        $this->updateInvoiceFromOrder($order);

        return back()->with('success', 'Item updated successfully');
    }

    private function updateInvoiceFromOrder(Order $order)
    {
        $invoice = Invoice::where('order_id', $order->id)->first();

        if (!$invoice) {
            return;
        }

        $invoice->final_amount          = $order->ttl_amount;
        $invoice->gst_percent           = 0;
        $invoice->gst_amount            = 0;
        $invoice->final_amount_with_gst = $order->ttl_amount;
        $invoice->save();

        InvoiceItem::where('invoice_id', $invoice->id)->delete();

        foreach ($order->items as $item) {
            InvoiceItem::create([
                'invoice_id'  => $invoice->id,
                'description' => $item->description,
                'ctn'         => $item->ctn,
                'qty'         => $item->qty,
                'ttl_qty'     => $item->ttl_qty,
                'unit'        => $item->unit,
                'price'       => $item->price,
                'ttl_amount'  => $item->ttl_amount,
                'cbm'         => $item->cbm,
                'ttl_cbm'     => $item->ttl_cbm,
                'kg'          => $item->kg,
                'ttl_kg'      => $item->ttl_kg,
                'shop_no'     => $item->shop_no,
            ]);
        }
    }
}