<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Services;

use App\Models\User;
use Illuminate\Support\Facades\DB;
use Modules\Helpdesk\Models\Comment;
use Modules\Helpdesk\Models\Status;
use Modules\Helpdesk\Models\Ticket;

final class TicketService
{
    public function __construct(
        private readonly TicketReferenceService $references,
        private readonly AgentAssignmentService $assignment,
        private readonly AttachmentService $attachments,
    ) {
    }

    /**
     * Create a ticket and store initial attachments.
     *
     * @param User $user
     * @param array<string, mixed> $data
     * @param array<int, \Illuminate\Http\UploadedFile> $files
     * @return Ticket
     */
    public function create(User $user, array $data, array $files = []): Ticket
    {
        return DB::transaction(function () use ($user, $data, $files): Ticket {
            $status = Status::query()->where('slug', config('helpdesk.default_status_slug'))->firstOrFail();

            /** @var Ticket $ticket */
            $ticket = Ticket::query()->create([
                'reference' => $this->references->next(),
                'user_id' => $user->id,
                'agent_id' => $this->assignment->selectAgentId($data['category_id'] ?? null),
                'status_id' => $status->id,
                'priority_id' => $data['priority_id'],
                'category_id' => $data['category_id'] ?? null,
                'project_id' => $data['project_id'] ?? null,
                'subject' => $data['subject'],
                'body' => $data['body'],
                'due_at' => $data['due_at'] ?? null,
                'last_activity_at' => now(),
            ]);

            $this->attachments->storeMany($ticket, $files, (int) $user->id);

            return $ticket->fresh(['owner', 'agent', 'status', 'priority', 'category', 'project', 'attachments']) ?? $ticket;
        });
    }

    /**
     * Add a public or internal comment and optional attachments.
     *
     * @param Ticket $ticket
     * @param User $user
     * @param string $body
     * @param bool $internal
     * @param array<int, \Illuminate\Http\UploadedFile> $files
     * @return Comment
     */
    public function comment(Ticket $ticket, User $user, string $body, bool $internal = false, array $files = []): Comment
    {
        return DB::transaction(function () use ($ticket, $user, $body, $internal, $files): Comment {
            /** @var Comment $comment */
            $comment = $ticket->comments()->create([
                'user_id' => $user->id,
                'body' => $body,
                'is_internal' => $internal,
            ]);

            $ticket->forceFill(['last_activity_at' => now()])->save();
            $this->attachments->storeMany($ticket, $files, (int) $user->id, $comment);

            return $comment->fresh(['user', 'attachments']) ?? $comment;
        });
    }

    /**
     * Close a ticket.
     *
     * @param Ticket $ticket
     * @param User $user
     * @return Ticket
     */
    public function close(Ticket $ticket, User $user): Ticket
    {
        $status = Status::query()->where('slug', config('helpdesk.closed_status_slug'))->firstOrFail();

        $ticket->forceFill([
            'status_id' => $status->id,
            'completed_at' => now(),
            'last_activity_at' => now(),
        ])->save();

        return $ticket->fresh(['status']) ?? $ticket;
    }
}