<?php

namespace App\Http\Controllers;

use Illuminate\Http\Request;
use App\Models\User;
use App\Models\Administration;
use App\Models\AddCard;
use Carbon\Carbon;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Facades\DB;

class AdminController extends Controller
{
    public function index(Request $request)
    {
        $selectedMonth = $request->input('month', Carbon::now()->format('Y-m'));
        $startOfMonth = Carbon::parse($selectedMonth)->startOfMonth();
        $endOfMonth = Carbon::parse($selectedMonth)->endOfMonth();

        // 1. Calculate top stats from all active users
        $allActiveUsers = User::where('status', User::STATUS_ACTIVE)->get()->map(function($user) use ($startOfMonth, $endOfMonth) {
            $user->total_received = Administration::where('receiver', $user->msnv)
                ->whereBetween('date', [$startOfMonth, $endOfMonth])
                ->sum('received');
            
            $user->total_sent = Administration::where('sender', $user->msnv)
                ->whereBetween('date', [$startOfMonth, $endOfMonth])
                ->sum('sent');

            return $user;
        });

        $topReceivedUser = $allActiveUsers->sortByDesc('total_received')->first();
        $topSentUser = $allActiveUsers->sortByDesc('total_sent')->first();

        // 2. Paginate users for the list table (10 per page)
        $users = User::where('status', User::STATUS_ACTIVE)->paginate(10)->withQueryString();

        // 3. Compute stats only for the paginated users (to display in the table)
        $users->getCollection()->transform(function($user) use ($startOfMonth, $endOfMonth) {
            $user->total_received = Administration::where('receiver', $user->msnv)
                ->whereBetween('date', [$startOfMonth, $endOfMonth])
                ->sum('received');
            
            $user->total_sent = Administration::where('sender', $user->msnv)
                ->whereBetween('date', [$startOfMonth, $endOfMonth])
                ->sum('sent');

            return $user;
        });

        return view('admin.users.index', compact('users', 'selectedMonth', 'topReceivedUser', 'topSentUser'));
    }

    public function create()
    {
        return view('admin.users.create');
    }

    public function store(Request $request)
    {
        $request->validate([
            'msnv' => 'required|unique:user,msnv',
            'mail' => 'required|email|unique:user,mail',
            'password' => 'required|min:6',
            'role' => 'required|in:' . User::ROLE_MEMBER . ',' . User::ROLE_ADMIN
        ]);

        User::create([
            'msnv' => $request->msnv,
            'mail' => $request->mail,
            'pass' => Hash::make($request->password),
            'role' => $request->role,
            'status' => User::STATUS_ACTIVE,
            'card' => 0,
            'flag_send' => User::FLAG_SEND_DISABLED,
            'first_login' => User::FIRST_LOGIN_TRUE
        ]);

        return redirect()->route('admin.users.index')->with('success', 'Tạo user thành công!');
    }

    public function edit(Request $request, $msnv)
    {
        $user = User::where('msnv', $msnv)->firstOrFail();
        
        $selectedMonth = $request->input('month', Carbon::now()->format('Y-m'));
        $startOfMonth = Carbon::parse($selectedMonth)->startOfMonth();
        $endOfMonth = Carbon::parse($selectedMonth)->endOfMonth();

        $administrations = Administration::where(function($q) use ($msnv) {
                $q->where('sender', $msnv)->orWhere('receiver', $msnv);
            })
            ->whereBetween('date', [$startOfMonth, $endOfMonth])
            ->orderBy('date', 'desc')
            ->get();

        return view('admin.users.edit', compact('user', 'administrations', 'selectedMonth'));
    }

    public function update(Request $request, $msnv)
    {
        $user = User::where('msnv', $msnv)->firstOrFail();
        
        $request->validate([
            'num_card' => 'nullable|integer|min:1',
            'flag_send' => 'nullable|boolean'
        ]);

        DB::transaction(function () use ($request, $user) {
            if ($request->filled('num_card')) {
                AddCard::create([
                    'buyer' => $user->msnv,
                    'num_card' => $request->num_card,
                    'seller' => auth()->user()->msnv,
                    'date' => Carbon::today()
                ]);
                $user->card += $request->num_card;
            }

            $user->flag_send = $request->has('flag_send') ? User::FLAG_SEND_ENABLED : User::FLAG_SEND_DISABLED;
            $user->save();
        });

        return redirect()->back()->with('success', 'Cập nhật thành công!');
    }

    public function destroy($msnv)
    {
        $user = User::where('msnv', $msnv)->firstOrFail();
        $user->status = User::STATUS_INACTIVE;
        $user->save();

        return redirect()->route('admin.users.index')->with('success', 'Đã đánh dấu nhân viên nghỉ việc thành công!');
    }

    public function resetCards()
    {
        User::where('status', User::STATUS_ACTIVE)->update(['card' => 0]);
        return redirect()->back()->with('success', 'Reset thẻ toàn hệ thống thành công!');
    }
}