<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\DiscordUser;
use App\Models\User;
use App\Notifications\DynamicNotification;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Http\JsonResponse;
use Illuminate\Http\Request;
use Illuminate\Notifications\Messages\MailMessage;
use Illuminate\Support\Facades\Notification;
use Illuminate\Support\HtmlString;
use Illuminate\Validation\ValidationException;
use Spatie\ValidationRules\Rules\Delimited;

class NotificationController extends Controller
{
    /**
     * Display all notifications of an user.
     * @param Request $request
     * @param int $userId
     * @return Response
     */
    public function index(Request $request, int $userId)
    {
        $discordUser = DiscordUser::find($userId);
        $user = $discordUser ? $discordUser->user : User::findOrFail($userId);

        return $user->notifications()->paginate($request->query("per_page", 50));
    }

    /**
     * Display a specific notification
     *
     * @param int $userId
     * @param int $notificationId
     * @return JsonResponse
     */
    public function view(int $userId, $notificationId)
    {
        $discordUser = DiscordUser::find($userId);
        $user = $discordUser ? $discordUser->user : User::findOrFail($userId);

        $notification = $user->notifications()->where("id", $notificationId)->get()->first();

        if (!$notification) {
            return response()->json(["message" => "Notification not found."], 404);
        }

        return $notification;
    }

    /**
     * Send a notification to an user.
     *
     * @param Request $request
     * @return JsonResponse
     * @throws ValidationException
     */
    public function send(Request $request)
    {
        $data = $request->validate([
            "via" => ["required", new Delimited("in:mail,database")],
            "all" => "required_without:users|boolean",
            "users" => ["required_without:all"],
            "title" => "required|string|min:1",
            "content" => "required|string|min:1"
        ]);
        $via = explode(",", $data["via"]);
        $mail = null;
        $database = null;

        if (in_array("database", $via)) {
            $database = [
                "title" => $data["title"],
                "content" => $data["content"]
            ];
        }
        if (in_array("mail", $via)) {
            $mail = (new MailMessage)
                ->subject($data["title"])
                ->line(new HtmlString($data["content"]));
        }

        $all = $data["all"] ?? false;
        if ($all) {
            $users = User::all();
        } else {
            $userIds = explode(",", $data["users"]);
            $users = User::query()
                ->whereIn("id", $userIds)
                ->orWhereHas('discordUser', function (Builder $builder) use ($userIds) {
                    $builder->whereIn('id', $userIds);
                })
                ->get();
        }

        if ($users->count() == 0) {
            throw ValidationException::withMessages([
                'users' => ['No users found!'],
            ]);
        }

        Notification::send($users, new DynamicNotification($via, $database, $mail));
        return response()->json(["message" => "Notification successfully sent.", 'user_count' => $users->count()]);
    }

    /**
     * Delete all notifications from an user
     *
     * @param int $userId
     * @return JsonResponse
     */
    public function delete(int $userId)
    {
        $discordUser = DiscordUser::find($userId);
        $user = $discordUser ? $discordUser->user : User::findOrFail($userId);

        $count = $user->notifications()->delete();

        return response()->json(["message" => "All notifications have been successfully deleted.", "count" => $count]);
    }


    /**
     * Delete a specific notification
     *
     * @param int $userId
     * @param int $notificationId
     * @return JsonResponse
     */
    public function deleteOne(int $userId, $notificationid)
    {
        $discordUser = DiscordUser::find($userId);
        $user = $discordUser ? $discordUser->user : User::findOrFail($userId);

        $notification = $user->notifications()->where("id", $notificationid)->get()->first();

        if (!$notification) {
            return response()->json(["message" => "Notification not found."], 404);
        }

        $notification->delete();
        return response()->json($notification);
    }
}