<?php

declare(strict_types=1);

namespace Modules\Helpdesk\Http\Controllers;

use App\Http\Controllers\Controller;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Illuminate\Support\Facades\Schema;
use Modules\Helpdesk\Models\Comment;
use Modules\Helpdesk\Models\Ticket;

final class TicketCommentDeleteController extends Controller
{
    /**
     * Tombstone a ticket response. Only Thredary/platform super administrators may delete responses.
     */
    public function __invoke(Request $request, Ticket $ticket, Comment $comment): RedirectResponse
    {
        $user = $request->user();

        abort_unless($user !== null && method_exists($user, 'isAdmin') && $user->isAdmin(), 403);
        abort_unless((int) $comment->ticket_id === (int) $ticket->id, 404);

        DB::transaction(function () use ($comment, $ticket, $user): void {
            $updates = [];

            if (Schema::hasColumn('helpdesk_comments', 'tombstoned_at')) {
                $updates['tombstoned_at'] = now();
            }

            if (Schema::hasColumn('helpdesk_comments', 'deleted_by')) {
                $updates['deleted_by'] = (int) $user->id;
            }

            if (Schema::hasColumn('helpdesk_comments', 'delete_reason')) {
                $updates['delete_reason'] = 'Deleted by Thredary platform administrator.';
            }

            if (Schema::hasColumn('helpdesk_comments', 'sync_sequence')) {
                $updates['sync_sequence'] = ((int) ($comment->sync_sequence ?? 0)) + 1;
            }

            if (Schema::hasColumn('helpdesk_comments', 'sync_hash')) {
                $updates['sync_hash'] = hash('sha256', implode('|', [
                    (string) ($comment->guid ?? $comment->id),
                    'deleted',
                    now()->toISOString(),
                ]));
            }

            if (Schema::hasColumn('helpdesk_comments', 'updated_at')) {
                $updates['updated_at'] = now();
            }

            if ($updates !== []) {
                DB::table('helpdesk_comments')
                    ->where('id', $comment->id)
                    ->update($updates);
            } else {
                $comment->delete();
            }

            if (Schema::hasColumn('helpdesk_tickets', 'last_activity_at')) {
                $ticket->forceFill(['last_activity_at' => now()])->save();
            }
        });

        return redirect()
            ->route('helpdesk.tickets.show', $ticket)
            ->with('ticket-comment-deleted', 'Response deleted.');
    }
}