using System;
using System.Collections.Generic;
using System.Linq;
using Monad;

public static class ServiceLocator
{
    static readonly List<(string Id, Type ServiceContract, object ServiceImpl)> serviceContainer =
        new List<(string, Type, object)>();

    private static Try<TImplementation> BindWithId<TContract, TImplementation>(string id,
        TImplementation t)
        where TContract : class
        where TImplementation : TContract
    {
        if (serviceContainer.Any(item => item.Id.Equals(id)))
        {
            return () =>
                throw new Exception("-->[ServiceLocator] the id : ({id}) is registered, please try with new id");
        }

        serviceContainer.Add((id, typeof(TContract), t));
        return () => t;
    }


    private static Try<TContract> GetById<TContract>(string id)
        where TContract : class
    {
        var service =
            serviceContainer.FirstOrDefault(item => item.Id.Equals(id) && item.ServiceContract == typeof(TContract));
        if (service != default)
            return () => service.ServiceImpl as TContract;

        if (serviceContainer.All(item => !item.Id.Equals(id)))
        {
            return () =>
                throw new Exception($"-->NOT FOUND: [ServiceLocator] not found any service with id : {id}");
        }

        service = serviceContainer.FirstOrDefault(item => item.Id.Equals(id));
        return () =>
            throw new Exception(
                $"-->NOT FOUND: [ServiceLocator] The id: ({id}) exist but the registered type is: [{service.ServiceContract}] NOT [{typeof(TContract)}]");
    }

    public static Try<TImplementation> Bind<TContract, TImplementation>(TImplementation t)
        where TContract : class
        where TImplementation : TContract
    {
        return BindWithId<TContract, TImplementation>(typeof(TContract).Name,
            t);
    }

    public static Try<TContract> Get<TContract>()
        where TContract : class
    {
        return GetById<TContract>(typeof(TContract).Name);
    }
}