<?php

namespace App\Http\Controllers;

use App\Models\Group;
use App\Models\User;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class GroupController extends Controller
{
    public function index(Request $request): View
    {
        $user = $request->user();

        $groups = Group::query()
            ->where('owner_id', $user->id)
            ->orWhereHas('members', fn ($q) => $q->where('users.id', $user->id))
            ->withCount('members')
            ->orderBy('name')
            ->get();

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

    public function create(): View
    {
        $this->authorize('create', Group::class);

        return view('groups.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $this->authorize('create', Group::class);

        $data = $request->validate([
            'name' => ['required', 'string', 'max:255'],
            'description' => ['nullable', 'string', 'max:5000'],
        ]);

        $group = Group::create([
            ...$data,
            'owner_id' => $request->user()->id,
        ]);

        return redirect()->route('groups.show', $group);
    }

    public function show(Request $request, Group $group): View
    {
        $this->authorize('view', $group);

        $group->load('owner', 'members');

        return view('groups.show', [
            'group' => $group,
            'canManage' => $request->user()->can('manageMembers', $group),
        ]);
    }

    public function addMember(Request $request, Group $group): RedirectResponse
    {
        $this->authorize('manageMembers', $group);

        $data = $request->validate([
            'email' => ['required', 'email'],
        ]);

        $user = User::where('email', $data['email'])->first();

        if (! $user) {
            return back()->withErrors(['email' => 'No user found with that email address.']);
        }

        if ($user->id === $group->owner_id) {
            return back()->withErrors(['email' => 'The group owner is already implicitly a member.']);
        }

        $group->members()->syncWithoutDetaching([$user->id]);

        return redirect()->route('groups.show', $group);
    }

    public function removeMember(Request $request, Group $group, User $user): RedirectResponse
    {
        $this->authorize('manageMembers', $group);

        $group->members()->detach($user->id);

        return redirect()->route('groups.show', $group);
    }
}