<?php

declare(strict_types=1);

namespace App\Services;

use App\Data\Ticket\CreateTicketRequest;
use App\Data\Ui\Ticket\TicketData;
use App\Enums\TicketStatusEnum;
use App\Models\{Ticket, TicketStatus, User};
use App\Notifications\TicketRaisedNotification;
use Illuminate\Http\UploadedFile;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\DB;
use InvalidArgumentException;
use Throwable;

final class TicketService
{
    public function __construct(
        private readonly TicketAttachmentService $attachmentService
    ) {}

    /**
     * Create a new support ticket.
     *
     * @throws Throwable
     */
    public function create(CreateTicketRequest $request): TicketData
    {
        return DB::transaction(function () use ($request): TicketData {
            $defaultStatus = TicketStatus::query()
                ->where('slug', TicketStatusEnum::Open->value)
                ->firstOrFail();

            /** @var Ticket $ticket */
            $ticket = Ticket::query()->create([
                'user_id' => $request->userId,
                'connected_app_id' => $request->connectedAppId,
                'issue_category' => $request->issueCategory,
                'description' => $request->description,
                'status_id' => $defaultStatus->id,
            ]);

            if (! empty($request->notifiedRoleIds)) {
                $ticket->notifiedRoles()->sync($request->notifiedRoleIds);
            }

            if (! empty($request->notifiedUserIds)) {
                $ticket->notifiedUsers()->sync($request->notifiedUserIds);
            }

            if ($request->attachment instanceof UploadedFile) {
                $this->attachmentService->store($ticket->id, $request->attachment);
            }

            // Load relations to build complete DTO and trigger notifications
            $ticket->load(['user', 'connectedApp', 'status', 'notifiedRoles', 'notifiedUsers', 'attachments']);

            $this->sendNotifications($ticket);

            return TicketData::fromModel($ticket);
        });
    }

    /**
     * Get all tickets raised by a specific user.
     *
     * @return Collection<int, TicketData>
     */
    public function getAllForUser(int $userId): Collection
    {
        if ($userId <= 0) {
            throw new InvalidArgumentException('Invalid user ID');
        }

        $tickets = Ticket::with(['user', 'connectedApp', 'status', 'notifiedRoles', 'notifiedUsers', 'attachments'])
            ->where('user_id', $userId)
            ->latest()
            ->get();

        return TicketData::collect($tickets);
    }

    /**
     * Get all tickets in the system (for admins/support).
     *
     * @return Collection<int, TicketData>
     */
    public function getAll(): Collection
    {
        $tickets = Ticket::with(['user', 'connectedApp', 'status', 'notifiedRoles', 'notifiedUsers', 'attachments'])
            ->latest()
            ->get();

        return TicketData::collect($tickets);
    }

    /**
     * Get a specific ticket.
     */
    public function getTicket(int $id): TicketData
    {
        if ($id <= 0) {
            throw new InvalidArgumentException('Invalid ticket ID');
        }

        $ticket = Ticket::with(['user', 'connectedApp', 'status', 'notifiedRoles', 'notifiedUsers', 'attachments'])
            ->findOrFail($id);

        return TicketData::fromModel($ticket);
    }

    /**
     * Update the status of a ticket.
     *
     * @throws Throwable
     */
    public function updateStatus(int $ticketId, string $statusSlug): void
    {
        if ($ticketId <= 0) {
            throw new InvalidArgumentException('Invalid ticket ID');
        }

        DB::transaction(function () use ($ticketId, $statusSlug): void {
            $ticket = Ticket::findOrFail($ticketId);
            $status = TicketStatus::where('slug', $statusSlug)->firstOrFail();

            $ticket->update(['status_id' => $status->id]);
        });
    }

    /**
     * Send notifications to all routed recipients.
     */
    private function sendNotifications(Ticket $ticket): void
    {
        $notification = new TicketRaisedNotification($ticket);
        $notifiedUserIds = [];

        // Notify specific users
        foreach ($ticket->notifiedUsers as $user) {
            $user->notify($notification);
            $notifiedUserIds[] = $user->id;
        }

        // Notify role users
        foreach ($ticket->notifiedRoles as $role) {
            $users = User::role($role->name)->get();
            foreach ($users as $user) {
                // Avoid double notifications
                if (! in_array($user->id, $notifiedUserIds, true)) {
                    $user->notify($notification);
                    $notifiedUserIds[] = $user->id;
                }
            }
        }
    }
}