using System;
using System.Reflection;
using OpenHarbor.CQRS.Abstractions.Attributes;

namespace OpenHarbor.CQRS.Abstractions.Discovery;

public sealed class CommandMeta : ICommandMeta
{
    public CommandMeta(Type commandType, Type serviceType, Type commandResultType)
    {
        CommandType = commandType;
        ServiceType = serviceType;
        CommandResultType = commandResultType;
    }

    public CommandMeta(Type commandType, Type serviceType)
    {
        CommandType = commandType;
        ServiceType = serviceType;
    }

    private CommandNameAttribute NameAttribute => CommandType.GetCustomAttribute<CommandNameAttribute>();

    public string Name
    {
        get
        {
            var name = NameAttribute?.Name ?? CommandType.Name.Replace("Command", string.Empty);
            return name;
        }
    }

    public Type CommandType { get; }
    public Type ServiceType { get; }
    public Type CommandResultType { get; }

    public string LowerCamelCaseName
    {
        get
        {
            if (string.IsNullOrEmpty(Name))
                return Name;

            var name = Name;
            var firstLetter = Char.ToLowerInvariant(name[0]);
            var ret = $"{firstLetter}{name.Substring(1)}";
            return ret;
        }
    }
}