<?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;

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

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

    // -------------------------------------------------------------------------
    // STEP 1 : ADD TEMPORARY ITEM
    // -------------------------------------------------------------------------

    public function addTempItem(Request $request)
    {
        // Validate item fields
        $item = $request->validate([
            'mark_no' => 'required',
            'origin' => 'required',
            'destination' => 'required',
            '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',
        ]);

        // ❌ Prevent changing mark_no once first item added
        if (session()->has('mark_no') && session('mark_no') != $request->mark_no) {
            return redirect()->to(route('admin.orders.index') . '#createOrderForm')
                             ->with('error', 'You must finish or clear the current order before changing Mark No.');
        }

        // Save mark, origin, destination ONLY ONCE
        if (!session()->has('mark_no')) {
            session([
                'mark_no' => $request->mark_no,
                'origin' => $request->origin,
                'destination' => $request->destination
            ]);
        }

        // ❌ DO NOT overwrite these values again
        // session(['mark_no' => $request->mark_no]);
        // session(['origin' => $request->origin]);
        // session(['destination' => $request->destination]);

        // Add new sub-item into session
        session()->push('temp_order_items', $item);

        return redirect()->to(route('admin.orders.index') . '#createOrderForm')
                         ->with('success', 'Item added.');
    }

    // -------------------------------------------------------------------------
    // STEP 2 : DELETE TEMPORARY ITEM
    // -------------------------------------------------------------------------

    public function deleteTempItem(Request $request)
    {
        $index = $request->index;

        $items = session('temp_order_items', []);

        if (isset($items[$index])) {
            unset($items[$index]);
            session(['temp_order_items' => array_values($items)]);
        }

        // If no items left → reset mark_no lock
        if (empty($items)) {
            session()->forget(['mark_no', 'origin', 'destination']);
        }

        return redirect()->to(route('admin.orders.index') . '#createOrderForm')
                         ->with('success', 'Item removed successfully.');
    }

    // -------------------------------------------------------------------------
    // STEP 3 : FINISH ORDER
    // -------------------------------------------------------------------------

    public function finishOrder(Request $request)
    {
        $request->validate([
            'mark_no' => 'required',
            'origin' => 'required',
            'destination' => 'required',
        ]);

        $items = session('temp_order_items', []);

        if (empty($items)) {
            return redirect()->to(route('admin.orders.index') . '#createOrderForm')
                             ->with('error', 'Add at least one item before finishing.');
        }

        // Generate Order ID
        $year = date('y');
        $prefix = "KNT-$year-";

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

        $orderId = $prefix . str_pad($nextNumber, 8, '0', STR_PAD_LEFT);

        // TOTAL SUMS
        $total_ctn = array_sum(array_column($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'));

        // CREATE ORDER
        $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',
        ]);

        // SAVE ALL SUB-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'],
            ]);
        }

        // CLEAR TEMP DATA
        session()->forget(['temp_order_items', 'mark_no', 'origin', 'destination']);

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

    // -------------------------------------------------------------------------
    // ORDER SHOW PAGE
    // -------------------------------------------------------------------------

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

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

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

    public function resetTemp()
    {
        session()->forget(['temp_order_items', 'mark_no', 'origin', 'destination']);

        return redirect()->to(route('admin.orders.index') . '#createOrderForm')
                        ->with('success', 'Order reset successfully.');
    }

}