<?php

namespace App\Http\Controllers\Admin;

use App\Enums\UserRole;
use App\Http\Controllers\Controller;
use App\Models\ActivityLog;
use App\Models\User;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Password;
use Illuminate\Support\Facades\Storage;
use Illuminate\Support\Str;
use Illuminate\Support\Facades\DB;
use Illuminate\Validation\Rule;
use Illuminate\View\View;

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

        // Sortierung
        $sortable = ['name', 'email', 'role', 'last_login_at', 'is_active', 'created_at'];
        $sort = in_array($request->input('sort'), $sortable) ? $request->input('sort') : 'created_at';
        $direction = $request->input('direction') === 'asc' ? 'asc' : 'desc';

        match ($sort) {
            'last_login_at' => $query->orderBy(DB::raw('CASE WHEN last_login_at IS NULL THEN 1 ELSE 0 END'))->orderBy('last_login_at', $direction),
            default => $query->orderBy($sort, $direction),
        };

        $users = $query->paginate(20)->withQueryString();
        $trashedUsers = User::onlyTrashed()
            ->where('deleted_at', '>=', now()->subDays(7))
            ->latest('deleted_at')
            ->get();

        return view('admin.users.index', compact('users', 'trashedUsers', 'sort', 'direction'));
    }

    public function edit(User $user): View
    {
        return view('admin.users.edit', compact('user'));
    }

    /**
     * Schutz: Coach darf keine Admin-Konten aendern (S01).
     */
    private function guardAgainstCoachModifyingAdmin(User $user): void
    {
        if (!auth()->user()->isAdmin() && $user->isAdmin()) {
            abort(403, __('admin.cannot_modify_admin'));
        }
    }

    public function update(Request $request, User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        $validated = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'email' => ['required', 'email', 'max:255', Rule::unique('users')->ignore($user->id)],
            'phone' => ['nullable', 'string', 'max:30'],
            'role' => ['required', 'in:admin,coach,parent_rep,user'],
            'profile_picture' => ['nullable', 'image', 'max:2048', 'mimes:jpg,jpeg,png,gif,webp'],
        ]);

        // Selbstschutz: Eigene Rolle nicht ändern
        if ($user->id === auth()->id()) {
            unset($validated['role']);
        } elseif (isset($validated['role']) && $validated['role'] === 'admin' && !auth()->user()->isAdmin()) {
            abort(403, __('admin.cannot_assign_admin_role'));
        }

        // Handle profile picture upload
        if ($request->hasFile('profile_picture')) {
            if ($user->profile_picture) {
                Storage::disk('public')->delete($user->profile_picture);
            }
            $file = $request->file('profile_picture');
            $storedName = 'avatars/' . Str::uuid() . '.' . $file->guessExtension();
            Storage::disk('public')->putFileAs('', $file, $storedName);
            $validated['profile_picture'] = $storedName;
        } else {
            unset($validated['profile_picture']);
        }

        $oldData = ['name' => $user->name, 'email' => $user->email, 'role' => $user->role->value];

        // Rolle separat setzen (nicht in $fillable fuer Mass-Assignment-Schutz)
        $newRole = $validated['role'] ?? null;
        unset($validated['role']);
        $user->update($validated);
        if ($newRole) {
            $user->role = $newRole;
            $user->save();
        }

        $newData = ['name' => $user->name, 'email' => $user->email, 'role' => $user->role->value];
        ActivityLog::logWithChanges('updated', __('admin.log_user_updated', ['name' => $user->name]), 'User', $user->id, $oldData, $newData);

        return redirect()->route('admin.users.index')->with('success', __('admin.user_updated'));
    }

    public function toggleActive(User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        if ($user->id === auth()->id()) {
            return back()->with('error', __('admin.cannot_deactivate_self'));
        }

        $oldActive = $user->is_active;

        $user->is_active = !$user->is_active;
        $user->save();

        $status = $user->is_active ? __('admin.activated') : __('admin.deactivated');
        ActivityLog::logWithChanges('toggled_active', __('admin.log_user_toggled', ['name' => $user->name, 'status' => $status]), 'User', $user->id, ['is_active' => $oldActive], ['is_active' => $user->is_active]);

        return back()->with('success', __('admin.user_toggled', ['status' => $status]));
    }

    public function updateRole(Request $request, User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        if ($user->id === auth()->id()) {
            return back()->with('error', __('admin.cannot_change_own_role'));
        }

        $validated = $request->validate([
            'role' => ['required', 'in:admin,coach,parent_rep,user'],
        ]);

        if ($validated['role'] === 'admin' && !auth()->user()->isAdmin()) {
            abort(403, __('admin.cannot_assign_admin_role'));
        }

        $oldRole = $user->role->value;

        $user->role = $validated['role'];
        $user->save();

        ActivityLog::logWithChanges('role_changed', __('admin.log_role_changed', ['name' => $user->name, 'role' => $validated['role']]), 'User', $user->id, ['role' => $oldRole], ['role' => $validated['role']]);

        return back()->with('success', __('admin.role_updated'));
    }

    public function resetPassword(User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        if ($user->id === auth()->id()) {
            return back()->with('error', __('admin.cannot_reset_own_password'));
        }

        $status = Password::sendResetLink(['email' => $user->email]);

        ActivityLog::log('password_reset', __('admin.log_password_reset', ['name' => $user->name]), 'User', $user->id);

        if ($status === Password::RESET_LINK_SENT) {
            return redirect()->route('admin.users.edit', $user)
                ->with('success', __('admin.password_reset_link_sent'));
        }

        return redirect()->route('admin.users.edit', $user)
            ->with('error', __($status));
    }

    public function removePicture(User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        if ($user->profile_picture) {
            Storage::disk('public')->delete($user->profile_picture);
            $user->update(['profile_picture' => null]);
        }

        return back()->with('success', __('admin.picture_removed'));
    }

    public function destroy(User $user): RedirectResponse
    {
        $this->guardAgainstCoachModifyingAdmin($user);

        // Schutz: nicht sich selbst und nicht User ID 1 löschen
        if ($user->id === auth()->id()) {
            return back()->with('error', __('admin.cannot_delete_self'));
        }
        if ($user->id === 1) {
            return back()->with('error', __('admin.cannot_delete_main_admin'));
        }

        $user->delete();

        ActivityLog::logWithChanges('deleted', __('admin.log_user_deleted', ['name' => $user->name]), 'User', $user->id, ['name' => $user->name, 'email' => $user->email, 'role' => $user->role->value], null);

        return redirect()->route('admin.users.index')->with('success', __('admin.user_deleted'));
    }

    public function restore(int $id): RedirectResponse
    {
        $user = User::onlyTrashed()->findOrFail($id);

        if (! $user->isRestorable()) {
            return back()->with('error', __('admin.restore_expired'));
        }

        $user->restore();

        ActivityLog::logWithChanges('restored', __('admin.log_user_restored', ['name' => $user->name]), 'User', $user->id, null, ['name' => $user->name, 'email' => $user->email]);

        return back()->with('success', __('admin.user_restored'));
    }

    public function toggleDsgvoConsent(User $user): RedirectResponse
    {
        if (!auth()->user()->isAdmin()) {
            abort(403);
        }

        if (!$user->hasDsgvoConsent()) {
            return back()->with('error', __('admin.dsgvo_no_file'));
        }

        if ($user->isDsgvoConfirmed()) {
            $old = [
                'dsgvo_accepted_at' => $user->dsgvo_accepted_at->toDateTimeString(),
                'dsgvo_accepted_by' => $user->dsgvoAcceptedBy?->name ?? (string) $user->dsgvo_accepted_by,
            ];
            $user->dsgvo_accepted_at = null;
            $user->dsgvo_accepted_by = null;
            $user->save();
            ActivityLog::logWithChanges(
                'dsgvo_consent_revoked',
                __('admin.log_dsgvo_revoked', ['name' => $user->name]),
                'User', $user->id, $old, null
            );
        } else {
            $user->dsgvo_accepted_at = now();
            $user->dsgvo_accepted_by = auth()->id();
            $user->save();
            ActivityLog::logWithChanges(
                'dsgvo_consent_confirmed',
                __('admin.log_dsgvo_confirmed', ['name' => $user->name]),
                'User', $user->id, null,
                [
                    'dsgvo_accepted_at' => now()->toDateTimeString(),
                    'dsgvo_accepted_by' => auth()->user()->name,
                ]
            );
        }

        return back()->with('success', __('admin.dsgvo_toggled'));
    }

    public function rejectDsgvoConsent(User $user): RedirectResponse
    {
        if (!auth()->user()->isAdmin()) {
            abort(403);
        }

        if (!$user->hasDsgvoConsent()) {
            return back()->with('error', __('admin.dsgvo_no_file'));
        }

        // Path-Traversal-Schutz
        if ($user->dsgvo_consent_file && !str_starts_with($user->dsgvo_consent_file, 'dsgvo/')) {
            abort(403);
        }

        // Datei vom Disk löschen
        Storage::disk('local')->delete($user->dsgvo_consent_file);

        $user->dsgvo_consent_file = null;
        $user->dsgvo_accepted_at = null;
        $user->dsgvo_accepted_by = null;
        $user->save();

        ActivityLog::log(
            'dsgvo_consent_rejected',
            __('admin.log_dsgvo_rejected', ['name' => $user->name]),
            'User',
            $user->id
        );

        return back()->with('success', __('admin.dsgvo_rejected'));
    }

    public function viewDsgvoConsent(User $user)
    {
        if (! auth()->user()->isAdmin()) {
            abort(403);
        }

        if (!$user->dsgvo_consent_file || !str_starts_with($user->dsgvo_consent_file, 'dsgvo/') || !Storage::disk('local')->exists($user->dsgvo_consent_file)) {
            abort(404);
        }

        ActivityLog::log('dsgvo_document_viewed', __('admin.log_dsgvo_viewed', ['name' => $user->name]), 'User', $user->id);

        $mimeType = Storage::disk('local')->mimeType($user->dsgvo_consent_file);

        return response()->file(
            Storage::disk('local')->path($user->dsgvo_consent_file),
            ['Content-Type' => $mimeType]
        );
    }
}