using System.Text.Json;
using ECPBLL.Communication.Interfaces;
using ECPDAL.Communication.Interfaces;
using GB5Shared.DTO.Framework.Login;
using GB5Shared.Telemetry;
using Microsoft.Extensions.Logging;

namespace ECPBLL.Communication.Implementations;

public class CommentMentionBLL(
    ICommentMentionDAL          _dal,
    ILogger<CommentMentionBLL>  _logger
) : ICommentMentionBLL
{
    // PropertyNamingPolicy left at its default (preserve declared PascalCase names) -- see
    // CommentThreadBLL.cs for why this override was removed.
    private static readonly JsonSerializerOptions JsonOpts = new();

    public async Task<string> GetPendingCommentMentionsAsync(LoginDTO login, CancellationToken ct)
    {
        GB5Trace.Step("get-pending-comment-mentions", new { login.UserId });
        try
        {
            var mentions = await _dal.GetPendingMentionsForUserAsync(login.UserId, login, ct).ConfigureAwait(false);
            return JsonSerializer.Serialize(mentions, JsonOpts);
        }
        catch (Exception ex)
        {
            GB5Trace.MarkFailed("get-pending-comment-mentions-failed", ex);
            _logger.LogError(ex, "GetPendingCommentMentions failed for UserId {UserId}", login.UserId);
            throw;
        }
    }
}