<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Setting;
use App\Models\User;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;
use Illuminate\View\View;

class UserController extends Controller
{
    public function index(Request $request): View
    {
        $query = User::query();

        if ($request->filled('search')) {
            $search = $request->search;
            $query->where(function ($q) use ($search) {
                $q->where('name', 'like', "%{$search}%")
                  ->orWhere('username', 'like', "%{$search}%")
                  ->orWhere('email', 'like', "%{$search}%");
            });
        }

        if ($request->filled('role')) {
            $role = $request->role;
            $query->where(function ($q) use ($role) {
                $q->where('role', $role)
                  ->orWhereJsonContains('roles', $role);
            });
        }

        $users = $query->orderBy('name')->paginate(20);

        return view('users.index', compact('users'));
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'username' => ['required', 'string', 'max:255', 'unique:users,username'],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users,email'],
            'phone' => ['nullable', 'string', 'max:20', 'regex:/^[0-9+\-\s()]*$/'],
            'password' => ['required', 'string', 'min:6'],
            'roles' => ['required', 'array', 'min:1'],
            'roles.*' => ['in:admin,bk,wali_kelas,staff,other,kepala_sekolah,waka_kesiswaan,ketua_tim'],
            'is_active' => ['boolean'],
        ]);

        $roles = array_values(array_unique($validated['roles']));
        $validated['roles'] = $roles;
        $validated['role'] = $roles[0];
        $validated['password'] = Hash::make($validated['password']);
        $validated['is_active'] = $request->boolean('is_active', true);

        User::create($validated);

        return redirect()->route('users.index')
            ->with('success', 'User berhasil ditambahkan.');
    }

    public function update(Request $request, User $user): RedirectResponse
    {
        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'username' => ['required', 'string', 'max:255', 'unique:users,username,' . $user->id],
            'email' => ['required', 'string', 'email', 'max:255', 'unique:users,email,' . $user->id],
            'phone' => ['nullable', 'string', 'max:20', 'regex:/^[0-9+\-\s()]*$/'],
            'password' => ['nullable', 'string', 'min:6'],
            'roles' => ['required', 'array', 'min:1'],
            'roles.*' => ['in:admin,bk,wali_kelas,staff,other,kepala_sekolah,waka_kesiswaan,ketua_tim'],
            'is_active' => ['boolean'],
        ]);

        $roles = array_values(array_unique($validated['roles']));
        $validated['roles'] = $roles;
        $validated['role'] = $roles[0];

        if (!empty($validated['password'])) {
            $validated['password'] = Hash::make($validated['password']);
        } else {
            unset($validated['password']);
        }

        $validated['is_active'] = $request->boolean('is_active', true);

        $user->update($validated);

        return redirect()->route('users.index')
            ->with('success', 'User berhasil diperbarui.');
    }

    public function destroy(User $user): RedirectResponse
    {
        if ($user->id === auth()->id()) {
            return back()->with('error', 'Tidak bisa menghapus akun sendiri.');
        }

        $user->delete();

        return redirect()->route('users.index')
            ->with('success', 'User berhasil dihapus.');
    }

    public function resetPassword(Request $request, User $user): RedirectResponse
    {
        if ($user->id === auth()->id() && $user->isAdmin()) {
            return back()->with('error', 'Ganti password admin lewat profil.');
        }

        $validated = $request->validate([
            'new_password' => ['required', 'string', 'min:6'],
        ]);

        $user->update([
            'password' => Hash::make($validated['new_password']),
        ]);

        return redirect()->route('users.index')
            ->with('success', 'Password untuk ' . $user->name . ' berhasil direset.');
    }

    /**
     * Akhiri sesi aktif user (single session) — user harus login ulang.
     */
    public function forceLogout(User $user): RedirectResponse
    {
        if ($user->id === auth()->id()) {
            return back()->with('error', 'Tidak bisa memaksa logout diri sendiri.');
        }

        $token = $user->active_session_token;
        $user->forceFill(['active_session_token' => null])->save();

        // Hapus session file lama agar perangkat lama benar-benar terlempar
        if ($token && config('session.driver') === 'file') {
            @unlink(storage_path('framework/sessions/'.$token));
        }

        return back()->with('success', 'Sesi '.$user->name.' diakhiri — akun bisa login kembali.');
    }

    /**
     * Kirim akun (link + username + password baru) ke nomor HP user via WhatsApp.
     * Password lama tidak bisa dikirim (tersimpan hash) — jadi dibuatkan password baru.
     *
     * Jika request AJAX/JSON → kembalikan URL wa.me (aplikasi tetap terbuka,
     * WhatsApp dibuka di tab baru). Jika tidak → redirect away (fallback).
     */
    public function sendWa(Request $request, User $user): RedirectResponse|JsonResponse
    {
        if ($user->id === auth()->id()) {
            return $this->waResponse($request, null, 'Tidak perlu mengirim akun ke diri sendiri.');
        }

        if (blank($user->phone)) {
            return $this->waResponse($request, null, 'Nomor HP belum diisi untuk ' . $user->name . ' — isi dulu di form edit user.');
        }

        // Generate password baru yang mudah dibaca (8 karakter, tanpa karakter ambigu)
        $password = Str::upper(Str::random(4)).rand(10, 99).Str::lower(Str::random(2));

        $user->update([
            'password' => Hash::make($password),
        ]);

        $appName = Setting::getValue('app_name', 'Aplikasi');
        $appUrl = Setting::getValue('app_url', config('app.url', ''));

        $message = implode("\n", [
            '📲 *Akun Aplikasi '.$appName.'*',
            '',
            'Yth. '.$user->name.',',
            'Berikut akun Anda untuk masuk ke aplikasi:',
            '',
            '🔗 Link: '.$appUrl,
            '👤 Username: '.$user->username,
            '🔑 Password: '.$password,
            '',
            'Mohon segera login dan ganti password Anda. Terima kasih.',
        ]);

        $waUrl = 'https://wa.me/'.$user->phone.'?text='.rawurlencode($message);

        return $this->waResponse($request, $waUrl, null, [
            'name' => $user->name,
            'username' => $user->username,
            'password' => $password,
            'app_name' => $appName,
            'app_url' => $appUrl,
        ]);
    }

    protected function waResponse(Request $request, ?string $url, ?string $error, array $extra = []): RedirectResponse|JsonResponse
    {
        if ($request->expectsJson() || $request->ajax()) {
            return response()->json(array_merge(
                $extra,
                ['url' => $url, 'error' => $error]
            ), $error ? 422 : 200);
        }

        if ($error) {
            return back()->with('error', $error);
        }

        return redirect()->away($url);
    }
}