using System;

namespace FrenchExDev.Net.State.Economy.Dsl;

/// <summary>
/// Secteur institutionnel au sens SEC 2010 / SCN 2008.
/// Implémenté comme phantom type : la classification d'une unité
/// institutionnelle devient une contrainte générique compile-time,
/// pas un champ <c>string</c> susceptible d'incohérence.
/// </summary>
public interface IInstitutionalSector
{
    /// <summary>Code SEC 2010 (ex : "S13", "S1311").</summary>
    string Code { get; }
}

/// <summary>Économie nationale totale (S1 = S11 + S12 + S13 + S14 + S15).</summary>
public sealed class S1_NationalEconomy : IInstitutionalSector
{
    public string Code => "S1";
    public static readonly S1_NationalEconomy Instance = new();
    private S1_NationalEconomy() { }
}

/// <summary>Sociétés non financières.</summary>
public sealed class S11_NonFinancialCorporations : IInstitutionalSector
{
    public string Code => "S11";
    public static readonly S11_NonFinancialCorporations Instance = new();
    private S11_NonFinancialCorporations() { }
}

/// <summary>Sociétés financières.</summary>
public sealed class S12_FinancialCorporations : IInstitutionalSector
{
    public string Code => "S12";
    public static readonly S12_FinancialCorporations Instance = new();
    private S12_FinancialCorporations() { }
}

/// <summary>
/// Administrations publiques (APU). Regroupe S1311 (Central),
/// S1313 (Collectivités locales), S1314 (Sécurité sociale).
/// C'est le secteur pour lequel les critères Maastricht s'appliquent.
/// </summary>
public sealed class S13_GeneralGovernment : IInstitutionalSector
{
    public string Code => "S13";
    public static readonly S13_GeneralGovernment Instance = new();
    private S13_GeneralGovernment() { }
}

/// <summary>État central (APUC).</summary>
public sealed class S1311_CentralGovernment : IInstitutionalSector
{
    public string Code => "S1311";
    public static readonly S1311_CentralGovernment Instance = new();
    private S1311_CentralGovernment() { }
}

/// <summary>Administrations publiques locales (APUL).</summary>
public sealed class S1313_LocalGovernment : IInstitutionalSector
{
    public string Code => "S1313";
    public static readonly S1313_LocalGovernment Instance = new();
    private S1313_LocalGovernment() { }
}

/// <summary>Administrations de sécurité sociale (ASSO).</summary>
public sealed class S1314_SocialSecurityFunds : IInstitutionalSector
{
    public string Code => "S1314";
    public static readonly S1314_SocialSecurityFunds Instance = new();
    private S1314_SocialSecurityFunds() { }
}

/// <summary>Ménages.</summary>
public sealed class S14_Households : IInstitutionalSector
{
    public string Code => "S14";
    public static readonly S14_Households Instance = new();
    private S14_Households() { }
}

/// <summary>Institutions sans but lucratif au service des ménages (ISBLSM).</summary>
public sealed class S15_NPISH : IInstitutionalSector
{
    public string Code => "S15";
    public static readonly S15_NPISH Instance = new();
    private S15_NPISH() { }
}

/// <summary>Reste du monde.</summary>
public sealed class S2_RestOfWorld : IInstitutionalSector
{
    public string Code => "S2";
    public static readonly S2_RestOfWorld Instance = new();
    private S2_RestOfWorld() { }
}