<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Pagination\LengthAwarePaginator;
use Illuminate\Support\Facades\Log;

class UserManagementController extends Controller
{
    const LEVEL_GURU = 'guru';
    const LEVEL_SISWA = 'siswa';

    public function index(Request $request)
    {
        try {
            $levelFilter = $request->get('level');

            $guruQuery = DB::table('guru')
                ->join('users', 'guru.user_id', '=', 'users.id')
                ->select(
                    'guru.id',
                    'users.email as username',
                    'guru.nama as nama',
                    DB::raw("'" . self::LEVEL_GURU . "' as level"),
                    'users.is_active'
                );

            $siswaQuery = DB::table('siswa')
                ->join('users', 'siswa.user_id', '=', 'users.id')
                ->select(
                    'siswa.id',
                    'users.email as username',
                    'siswa.nama as nama',
                    DB::raw("'" . self::LEVEL_SISWA . "' as level"),
                    'users.is_active'
                );

            $union = $guruQuery->unionAll($siswaQuery);
            $users = DB::query()->fromSub($union, 'users');

            if ($levelFilter) {
                $users->where('level', $levelFilter);
            }

            $page = $request->get('page', 1);
            $perPage = 10;
            $allUsers = $users->get();
            $currentPageItems = $allUsers->slice(($page - 1) * $perPage, $perPage)->values();

            $paginatedUsers = new LengthAwarePaginator(
                $currentPageItems,
                $allUsers->count(),
                $perPage,
                $page,
                ['path' => $request->url(), 'query' => $request->query()]
            );

            $data['users'] = $paginatedUsers;

            return view('admin.user.index', $data)->with('success', session('success'));
        } catch (\Exception $e) {
            Log::error('Gagal memuat data user: ' . $e->getMessage());
            return back()->withErrors('Terjadi kesalahan saat memuat data user.');
        }
    }

    public function edit(Request $request, $id)
    {
        try {
            $level = $request->level;

            if ($level == self::LEVEL_GURU) {
                $userDetail = DB::table('guru')->where('id', $id)->first();
            } elseif ($level == self::LEVEL_SISWA) {
                $userDetail = DB::table('siswa')->where('id', $id)->first();
            } else {
                return back()->with('error', 'Level tidak dikenali');
            }

            if (!$userDetail) {
                return back()->with('error', 'User tidak ditemukan');
            }

            $user = DB::table('users')->where('id', $userDetail->user_id)->first();

            if (!$user) {
                return back()->with('error', 'User utama tidak ditemukan');
            }

            return view('admin.user.edit', [
                'level' => $level,
                'id' => $id,
                'userDetail' => $userDetail,
                'user' => $user,
            ]);
        } catch (\Exception $e) {
            Log::error('Gagal membuka halaman edit user: ' . $e->getMessage());
            return back()->withErrors('Terjadi kesalahan saat membuka halaman edit.');
        }
    }

    public function update(Request $request, $id)
    {
        try {
            $level = $request->level;

            if ($level == self::LEVEL_GURU) {
                $userDetail = DB::table('guru')->where('id', $id)->first();
            } elseif ($level == self::LEVEL_SISWA) {
                $userDetail = DB::table('siswa')->where('id', $id)->first();
            } else {
                return back()->with('error', 'Level tidak dikenali');
            }

            if (!$userDetail) {
                return back()->with('error', 'User tidak ditemukan');
            }

            $userId = $userDetail->user_id;

            $request->validate([
                'email' => 'required|email|unique:users,email,' . $userId,
                'password' => 'nullable|min:6',
            ]);

            $dataUpdate = [
                'email' => $request->email,
                'updated_at' => now(),
            ];

            if ($request->filled('password')) {
                $dataUpdate['password'] = bcrypt($request->password);
            }

            DB::table('users')->where('id', $userId)->update($dataUpdate);

            return redirect()->route('admin.users.index')->with('success', 'User berhasil diperbarui');
        } catch (\Exception $e) {
            Log::error('Gagal memperbarui user: ' . $e->getMessage());
            return back()->withErrors('Terjadi kesalahan saat memperbarui user.');
        }
    }

    public function destroy(Request $request, $id)
    {
        try {
            $level = $request->level;

            if ($level == self::LEVEL_GURU) {
                DB::table('guru')->where('id', $id)->delete();
            } elseif ($level == self::LEVEL_SISWA) {
                DB::table('siswa')->where('id', $id)->delete();
            } else {
                return back()->with('error', 'Level tidak dikenali');
            }

            return back()->with('success', 'User berhasil dihapus');
        } catch (\Exception $e) {
            Log::error('Gagal menghapus user: ' . $e->getMessage());
            return back()->withErrors('Terjadi kesalahan saat menghapus user.');
        }
    }

    public function toggleAktif(Request $request, $id)
    {
        try {
            switch ($request->level) {
                case self::LEVEL_GURU:
                    $tbl = 'guru';
                    break;
                case self::LEVEL_SISWA:
                    $tbl = 'siswa';
                    break;
                default:
                    return back()->with('error', 'Level tidak valid');
            }

            $userDetail = DB::table($tbl)->where('id', $id)->first();

            if (!$userDetail) {
                return back()->with('error', 'User tidak ditemukan');
            }

            $user = DB::table('users')->where('id', $userDetail->user_id)->first();

            if (!$user) {
                return back()->with('error', 'User utama tidak ditemukan');
            }

            $newStatus = $user->is_active ? 0 : 1;

            DB::table('users')->where('id', $userDetail->user_id)->update(['is_active' => $newStatus]);

            return back()->with('success', 'Status aktifasi berhasil diubah');
        } catch (\Exception $e) {
            Log::error('Gagal mengubah status user: ' . $e->getMessage());
            return back()->withErrors('Terjadi kesalahan saat mengubah status aktifasi.');
        }
    }
}