using Knot.Contracts.Profiles.Application.DTOs;
using Knot.Contracts.Profiles.Domain;
using Knot.Shared.Kernel;
using MediatR;

namespace Knot.Modules.Profiles.Application.Statuses;

public sealed record SetCustomUserStatusCommand(
    Guid UserId,
    string? Emoji,
    string? Text,
    DateTime? ExpiresAt,
    string? PresetKey) : IRequest<Result<UserProfileDto>>;

public sealed class SetCustomUserStatusCommandHandler : IRequestHandler<SetCustomUserStatusCommand, Result<UserProfileDto>>
{
    private readonly IProfileStatusWriter _writer;

    public SetCustomUserStatusCommandHandler(IProfileStatusWriter writer)
    {
        _writer = writer;
    }

    public async Task<Result<UserProfileDto>> Handle(SetCustomUserStatusCommand request, CancellationToken cancellationToken)
    {
        var key = request.PresetKey?.Trim();
        if (!string.IsNullOrEmpty(key) && key.Equals("online", StringComparison.OrdinalIgnoreCase))
            return await _writer.ClearAsync(request.UserId, cancellationToken);

        var emoji = request.Emoji?.Trim() ?? string.Empty;
        var text = request.Text?.Trim() ?? string.Empty;

        if (!string.IsNullOrEmpty(key))
        {
            var preset = StatusPresetCatalog.Find(key);
            if (preset is null)
                return Result.Failure<UserProfileDto>(ProfilesErrors.InvalidPreset);
            if (string.IsNullOrEmpty(emoji))
                emoji = preset.Emoji;
            if (string.IsNullOrEmpty(text))
                text = preset.TextRu;
        }

        if (string.IsNullOrEmpty(emoji) && string.IsNullOrEmpty(text))
            return Result.Failure<UserProfileDto>(ProfilesErrors.StatusEmpty);

        if (text.Length > 50)
            return Result.Failure<UserProfileDto>(ProfilesErrors.StatusTextTooLong);

        var presetForWriter = string.IsNullOrWhiteSpace(key) ? null : key;
        return await _writer.SetCustomAsync(request.UserId, emoji, text, request.ExpiresAt, presetForWriter, cancellationToken);
    }
}