<?php

namespace App\Http\Controllers\Admin;

use App\Enums\UserRole;
use App\Http\Controllers\Controller;
use App\Models\ActivityLog;
use App\Models\Comment;
use App\Models\Event;
use App\Models\EventCatering;
use App\Models\EventParticipant;
use App\Models\EventTimekeeper;
use App\Models\Player;
use App\Models\User;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Str;
use Illuminate\View\View;

class ActivityLogController extends Controller
{
    public function index(Request $request): View
    {
        if (!auth()->user()->canViewActivityLog()) {
            abort(403);
        }

        $request->validate([
            'category' => ['nullable', 'string', 'in:auth,users,players,events,files,settings,dsgvo'],
            'from' => ['nullable', 'date'],
            'to' => ['nullable', 'date'],
        ]);

        $query = ActivityLog::with('user')->latest('created_at');

        // Filter: Kategorie
        if ($request->filled('category')) {
            $actionMap = [
                'auth' => ['login', 'logout', 'login_failed', 'registered'],
                'users' => ['updated', 'toggled_active', 'role_changed', 'password_reset', 'deleted', 'restored'],
                'players' => ['created', 'updated', 'deleted', 'restored', 'parent_assigned', 'parent_removed'],
                'events' => ['created', 'updated', 'deleted', 'participant_status_changed'],
                'files' => ['uploaded', 'deleted'],
                'settings' => ['updated'],
                'dsgvo' => ['dsgvo_consent_uploaded', 'dsgvo_consent_confirmed', 'dsgvo_consent_revoked', 'dsgvo_consent_removed', 'dsgvo_consent_rejected', 'account_self_deleted', 'child_auto_deactivated'],
            ];

            $category = $request->input('category');
            if (isset($actionMap[$category])) {
                if ($category === 'auth' || $category === 'dsgvo') {
                    $query->whereIn('action', $actionMap[$category]);
                } else {
                    $modelTypeMap = [
                        'users' => 'User',
                        'players' => 'Player',
                        'events' => 'Event',
                        'files' => 'File',
                        'settings' => 'Setting',
                    ];
                    $query->where('model_type', $modelTypeMap[$category] ?? null);
                }
            }
        }

        // Filter: Datum von
        if ($request->filled('from')) {
            $query->whereDate('created_at', '>=', $request->input('from'));
        }

        // Filter: Datum bis
        if ($request->filled('to')) {
            $query->whereDate('created_at', '<=', $request->input('to'));
        }

        $logs = $query->paginate(30)->withQueryString();

        return view('admin.activity-logs.index', compact('logs'));
    }

    public function revert(ActivityLog $log): RedirectResponse
    {
        if (!auth()->user()->canViewActivityLog()) {
            abort(403);
        }

        $old = $log->properties['old'] ?? [];

        $revertableActions = ['deleted', 'toggled_active', 'role_changed', 'status_changed', 'participant_status_changed'];
        if (!in_array($log->action, $revertableActions) || !$log->model_id) {
            return back()->with('error', __('admin.log_revert_not_possible'));
        }

        $success = match ($log->action) {
            'deleted' => $this->revertDelete($log),
            'toggled_active' => $this->revertToggleActive($log, $old),
            'role_changed' => $this->revertRoleChange($log, $old),
            'status_changed' => $this->revertStatusChange($log, $old),
            'participant_status_changed' => $this->revertParticipantStatus($log, $old),
            default => false,
        };

        if (!$success) {
            return back()->with('error', __('admin.log_revert_not_possible'));
        }

        ActivityLog::log('reverted', __('admin.log_reverted', ['desc' => Str::limit($log->description, 80)]), $log->model_type, $log->model_id);

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

    private function revertDelete(ActivityLog $log): bool
    {
        return match ($log->model_type) {
            'User' => $this->restoreModel(User::class, $log->model_id),
            'Player' => $this->restoreModel(Player::class, $log->model_id),
            'Event' => $this->restoreEvent($log->model_id),
            'Comment' => $this->restoreComment($log->model_id),
            default => false,
        };
    }

    private function restoreModel(string $class, int $id): bool
    {
        $model = $class::onlyTrashed()->find($id);
        if (!$model) {
            return false;
        }
        $model->restore();
        return true;
    }

    private function restoreEvent(int $id): bool
    {
        $event = Event::onlyTrashed()->find($id);
        if (!$event) {
            return false;
        }
        $event->deleted_by = null;
        $event->save();
        $event->restore();
        return true;
    }

    private function restoreComment(int $id): bool
    {
        $comment = Comment::find($id);
        if (!$comment || !$comment->isDeleted()) {
            return false;
        }
        $comment->deleted_at = null;
        $comment->deleted_by = null;
        $comment->save();
        return true;
    }

    private function revertToggleActive(ActivityLog $log, array $old): bool
    {
        $model = match ($log->model_type) {
            'User' => User::withTrashed()->find($log->model_id),
            'Player' => Player::withTrashed()->find($log->model_id),
            default => null,
        };

        if (!$model || !isset($old['is_active'])) {
            return false;
        }

        $model->is_active = filter_var($old['is_active'], FILTER_VALIDATE_BOOLEAN);
        $model->save();
        return true;
    }

    private function revertRoleChange(ActivityLog $log, array $old): bool
    {
        if ($log->model_type !== 'User' || !isset($old['role'])) {
            return false;
        }

        // Enum-Validierung: Nur gültige Rollen-Werte akzeptieren (V02)
        $validRoles = array_column(UserRole::cases(), 'value');
        if (!in_array($old['role'], $validRoles, true)) {
            return false;
        }

        $user = User::withTrashed()->find($log->model_id);
        if (!$user) {
            return false;
        }

        // Selbst-Rollen-Änderung verhindern
        if ($user->id === auth()->id()) {
            return false;
        }

        // Nicht-Admins dürfen keine Admin-Rolle zuweisen oder Admin-Rollen rückgängig machen
        if (!auth()->user()->isAdmin() && ($user->isAdmin() || $old['role'] === 'admin')) {
            return false;
        }

        $user->role = $old['role'];
        $user->save();
        return true;
    }

    private function revertStatusChange(ActivityLog $log, array $old): bool
    {
        if (!isset($old['status']) || $log->model_type !== 'Event') {
            return false;
        }

        $userId = $log->properties['old']['user_id'] ?? $log->properties['new']['user_id'] ?? null;
        if (!$userId) {
            return false;
        }

        $catering = EventCatering::where('event_id', $log->model_id)->where('user_id', $userId)->first();
        if ($catering) {
            $catering->update(['status' => $old['status']]);
            return true;
        }

        $timekeeper = EventTimekeeper::where('event_id', $log->model_id)->where('user_id', $userId)->first();
        if ($timekeeper) {
            $timekeeper->update(['status' => $old['status']]);
            return true;
        }

        return false;
    }

    private function revertParticipantStatus(ActivityLog $log, array $old): bool
    {
        if (!isset($old['status']) || $log->model_type !== 'Event') {
            return false;
        }

        // Spieler-ID bevorzugen, Namens-Suche als Fallback (DB-agnostisch)
        $participant = EventParticipant::where('event_id', $log->model_id)
            ->when(
                isset($old['participant_id']),
                fn ($q) => $q->where('id', $old['participant_id']),
                fn ($q) => $q->when(
                    isset($old['player']),
                    fn ($q2) => $q2->whereHas('player', function ($pq) use ($old) {
                        $parts = explode(' ', $old['player'], 2);
                        if (count($parts) === 2) {
                            $pq->where('first_name', $parts[0])->where('last_name', $parts[1]);
                        }
                    })
                )
            )
            ->first();

        if (!$participant) {
            return false;
        }

        $participant->status = $old['status'];
        $participant->set_by_user_id = auth()->id();
        $participant->responded_at = now();
        $participant->save();
        return true;
    }
}