namespace CredentialManager.Models;

/// <summary>
/// Tipi di credenziali supportate
/// </summary>
public enum CredentialType
{
    Database,
    RestApi,
    OAuth,
    ApiKey,
    BasicAuth
}

/// <summary>
/// Tipi di servizi REST specifici
/// </summary>
public enum RestServiceType
{
    Generic,
    SapB1ServiceLayer,
    Salesforce
}

/// <summary>
/// Tipo di flusso OAuth2 per Salesforce
/// </summary>
public enum SalesforceGrantType
{
    /// <summary>
    /// Flusso Username/Password (grant_type=password). 
    /// Richiede: ClientId, ClientSecret, Username, Password (+SecurityToken se non IP-trusted).
    /// URL di login: https://login.salesforce.com o https://test.salesforce.com.
    /// </summary>
    Password,

    /// <summary>
    /// Flusso Client Credentials (grant_type=client_credentials) — server-to-server, senza utente.
    /// Richiede: ClientId, ClientSecret. 
    /// URL obbligatorio: My Domain URL (es. https://myorg.my.salesforce.com).
    /// La Connected App deve avere "Enable Client Credentials Flow" attivato e un Integration User assegnato.
    /// </summary>
    ClientCredentials
}

/// <summary>
/// Tipi di database supportati (allineato con DataConnection.Enums.DatabaseType)
/// </summary>
public enum DatabaseType
{
    SqlServer,
    MySql,
    PostgreSql,
    Oracle,
    Sqlite,
    DB2,
    SapHana,
    Odbc,
    OleDb
}

/// <summary>
/// Modalità di connessione ODBC
/// </summary>
public enum OdbcConnectionMode
{
    /// <summary>
    /// Utilizzo di un DSN (Data Source Name) configurato
    /// </summary>
    Dsn,
    
    /// <summary>
    /// Costruzione manuale della connection string
    /// </summary>
    Custom
}

/// <summary>
/// DTO per le credenziali database - completo per tutti i tipi di DB supportati
/// </summary>
public class DatabaseCredential
{
    public string Name { get; set; } = string.Empty;
    public DatabaseType DatabaseType { get; set; }
    public string Host { get; set; } = string.Empty;
    public int Port { get; set; }
    public string? DatabaseName { get; set; } = string.Empty; // Ora opzionale
    public string Username { get; set; } = string.Empty;
    public string Password { get; set; } = string.Empty;
    public string? ConnectionString { get; set; }
    public int CommandTimeout { get; set; } = 30;
    public bool IgnoreSslErrors { get; set; } = false;
    public Dictionary<string, string>? AdditionalParameters { get; set; }
    
    // ODBC specific properties
    public string? OdbcDsnName { get; set; } // Nome del DSN ODBC (se utilizzato)
    public OdbcConnectionMode OdbcMode { get; set; } = OdbcConnectionMode.Dsn; // Modalità ODBC (DSN o Custom)
}

/// <summary>
/// DTO per le credenziali REST API - allineato con RestServiceOptions e esteso per servizi specifici
/// </summary>
public class RestApiCredential
{
    public string Name { get; set; } = string.Empty;
    public RestServiceType ServiceType { get; set; } = RestServiceType.Generic;
    public string BaseUrl { get; set; } = string.Empty;
    public string? ApiKey { get; set; }
    public string? Username { get; set; }
    public string? Password { get; set; }
    public string? AuthToken { get; set; }
    public string? BearerToken { get; set; }
    public int TimeoutSeconds { get; set; } = 100;
    public bool IgnoreSslErrors { get; set; } = false;
    public Dictionary<string, string>? Headers { get; set; }
    public Dictionary<string, string>? AdditionalParameters { get; set; }

    // Campi specifici per SAP B1 Service Layer
    public string? CompanyDatabase { get; set; }
    public string? Language { get; set; } = "en-US";
    public string? Version { get; set; } = "v1";
    public bool UseTrustedConnection { get; set; } = false;

    // Campi specifici per Salesforce
    public string? SecurityToken { get; set; }
    public string? ClientId { get; set; }
    public string? ClientSecret { get; set; }
    public string? ApiVersion { get; set; } = "59.0";
    public bool IsSandbox { get; set; } = false;
    public bool UseSoapApi { get; set; } = false;
    public SalesforceGrantType GrantType { get; set; } = SalesforceGrantType.Password;
    public string? RefreshToken { get; set; }
    public string? AccessToken { get; set; }
    public DateTime? TokenExpiry { get; set; }
}

/// <summary>
/// Credenziali specifiche per SAP Business One Service Layer
/// </summary>
public class SapB1ServiceLayerCredential
{
    public string Name { get; set; } = string.Empty;
    public string ServerUrl { get; set; } = string.Empty; // es: https://server:50000/b1s/v1/
    public string CompanyDatabase { get; set; } = string.Empty; // Database dell'azienda SAP
    public string Username { get; set; } = string.Empty;
    public string Password { get; set; } = string.Empty;
    public string? Language { get; set; } = "en-US"; // Lingua per la sessione
    public int TimeoutSeconds { get; set; } = 300; // Timeout per le chiamate API
    public bool IgnoreSslErrors { get; set; } = false;
    public string? Version { get; set; } = "v1"; // Versione del Service Layer (v1, v2, etc.)
    public bool UseTrustedConnection { get; set; } = false; // Per autenticazione Windows
    public Dictionary<string, string>? AdditionalHeaders { get; set; }
}

/// <summary>
/// Credenziali specifiche per Salesforce
/// </summary>
public class SalesforceCredential
{
    public string Name { get; set; } = string.Empty;
    public string LoginUrl { get; set; } = "https://login.salesforce.com"; // o https://test.salesforce.com per sandbox
    public string Username { get; set; } = string.Empty;
    public string Password { get; set; } = string.Empty;
    public string SecurityToken { get; set; } = string.Empty; // Token di sicurezza Salesforce
    public string? ClientId { get; set; } = string.Empty; // Consumer Key per Connected App
    public string? ClientSecret { get; set; } = string.Empty; // Consumer Secret per Connected App
    public string ApiVersion { get; set; } = "59.0"; // Versione API Salesforce
    public bool IsSandbox { get; set; } = false; // Se è un ambiente sandbox
    public int TimeoutSeconds { get; set; } = 120;
    public bool UseSoapApi { get; set; } = false; // Se usare SOAP invece di REST
    /// <summary>Tipo di flusso OAuth2 da utilizzare. Default: Password (retrocompatibile).</summary>
    public SalesforceGrantType GrantType { get; set; } = SalesforceGrantType.Password;
    public string? RefreshToken { get; set; }
    public string? AccessToken { get; set; }
    public DateTime? TokenExpiry { get; set; }
}

/// <summary>
/// Factory per creare connection string per i diversi tipi di database
/// </summary>
public static class ConnectionStringBuilder
{
    public static string BuildConnectionString(DatabaseCredential credential)
    {
        if (!string.IsNullOrEmpty(credential.ConnectionString))
            return credential.ConnectionString;

        return credential.DatabaseType switch
        {
            DatabaseType.SqlServer => BuildSqlServerConnectionString(credential),
            DatabaseType.MySql => BuildMySqlConnectionString(credential),
            DatabaseType.PostgreSql => BuildPostgreSqlConnectionString(credential),
            DatabaseType.Oracle => BuildOracleConnectionString(credential),
            DatabaseType.Sqlite => BuildSqliteConnectionString(credential),
            DatabaseType.DB2 => BuildDb2ConnectionString(credential),
            DatabaseType.SapHana => BuildSapHanaConnectionString(credential),
            DatabaseType.Odbc => BuildOdbcConnectionString(credential),
            DatabaseType.OleDb => BuildOleDbConnectionString(credential),
            _ => throw new NotSupportedException($"Database type {credential.DatabaseType} not supported")
        };
    }    private static string BuildSqlServerConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>();
        
        // Gestione speciale per SQL Server locale e named instances
        // Se l'host contiene '\' (instance name) o '(localdb)', non aggiungere la porta
        bool hasInstanceName = credential.Host.Contains('\\') || 
                               credential.Host.StartsWith("(localdb)", StringComparison.OrdinalIgnoreCase);
        
        if (hasInstanceName)
        {
            // Per named instances e LocalDB, non includere la porta
            builder.Add($"Server={credential.Host}");
        }
        else
        {
            // Per connessioni TCP/IP standard, include host e porta
            // Ma solo se la porta non è la default (1433) per localhost
            if ((credential.Host.Equals("localhost", StringComparison.OrdinalIgnoreCase) || 
                 credential.Host == "." || 
                 credential.Host == "127.0.0.1") && credential.Port == 1433)
            {
                // Per localhost con porta default, ometti la porta per usare Named Pipes
                builder.Add($"Server={credential.Host}");
            }
            else
            {
                // Per altri casi, usa host,porta
                builder.Add($"Server={credential.Host},{credential.Port}");
            }
        }
        
        // Se username è vuoto o è "Integrated", usa Windows Authentication
        if (string.IsNullOrWhiteSpace(credential.Username) || 
            credential.Username.Equals("Integrated", StringComparison.OrdinalIgnoreCase) ||
            credential.Username.Equals("Windows", StringComparison.OrdinalIgnoreCase))
        {
            builder.Add("Integrated Security=True");
        }
        else
        {
            // Usa SQL Server Authentication
            builder.Add($"User Id={credential.Username}");
            builder.Add($"Password={credential.Password}");
        }
        
        builder.Add($"Connection Timeout={credential.CommandTimeout}");

        // Aggiungi Database solo se specificato
        if (!string.IsNullOrEmpty(credential.DatabaseName))
            builder.Add($"Database={credential.DatabaseName}");

        if (credential.IgnoreSslErrors)
            builder.Add("TrustServerCertificate=True");

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }    private static string BuildMySqlConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>
        {
            $"Server={credential.Host}",
            $"Port={credential.Port}",
            $"Uid={credential.Username}",
            $"Pwd={credential.Password}",
            $"Connection Timeout={credential.CommandTimeout}"
        };

        // Aggiungi Database solo se specificato
        if (!string.IsNullOrEmpty(credential.DatabaseName))
            builder.Add($"Database={credential.DatabaseName}");

        if (credential.IgnoreSslErrors)
            builder.Add("SslMode=None");

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }    private static string BuildPostgreSqlConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>
        {
            $"Host={credential.Host}",
            $"Port={credential.Port}",
            $"Username={credential.Username}",
            $"Password={credential.Password}",
            $"Timeout={credential.CommandTimeout}"
        };

        // Aggiungi Database solo se specificato
        if (!string.IsNullOrEmpty(credential.DatabaseName))
            builder.Add($"Database={credential.DatabaseName}");

        if (credential.IgnoreSslErrors)
            builder.Add("SSL Mode=Disable");

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }    private static string BuildOracleConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>();
        
        // Per Oracle, il formato cambia se c'è o meno un database specificato
        if (!string.IsNullOrEmpty(credential.DatabaseName))
        {
            builder.Add($"Data Source={credential.Host}:{credential.Port}/{credential.DatabaseName}");
        }
        else
        {
            builder.Add($"Data Source={credential.Host}:{credential.Port}");
        }
        
        builder.AddRange(new[]
        {
            $"User Id={credential.Username}",
            $"Password={credential.Password}",
            $"Connection Timeout={credential.CommandTimeout}"
        });

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }

    private static string BuildSqliteConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>
        {
            $"Data Source={credential.DatabaseName}"
        };

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }

    private static string BuildDb2ConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>
        {
            $"Server={credential.Host}:{credential.Port}",
            $"Database={credential.DatabaseName}",
            $"UID={credential.Username}",
            $"PWD={credential.Password}",
            $"Connection Timeout={credential.CommandTimeout}"
        };

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }

    private static string BuildSapHanaConnectionString(DatabaseCredential credential)
    {
        var builder = new List<string>
        {
            $"Server={credential.Host}:{credential.Port}",
            $"DatabaseName={credential.DatabaseName}",
            $"UserID={credential.Username}",
            $"Password={credential.Password}",
            $"Connection Timeout={credential.CommandTimeout}"
        };

        AddAdditionalParameters(builder, credential.AdditionalParameters);
        return string.Join(";", builder);
    }

    private static string BuildOdbcConnectionString(DatabaseCredential credential)
    {
        // Se è già presente una connection string personalizzata, utilizzala
        if (!string.IsNullOrEmpty(credential.ConnectionString))
            return credential.ConnectionString;

        var builder = new List<string>();

        // Modalità DSN: usa il DSN configurato
        if (credential.OdbcMode == OdbcConnectionMode.Dsn && !string.IsNullOrEmpty(credential.OdbcDsnName))
        {
            builder.Add($"DSN={credential.OdbcDsnName}");
            
            // Aggiungi credenziali se fornite
            if (!string.IsNullOrEmpty(credential.Username))
                builder.Add($"UID={credential.Username}");
            
            if (!string.IsNullOrEmpty(credential.Password))
                builder.Add($"PWD={credential.Password}");
        }
        // Modalità Custom: costruisci manualmente la connection string
        else
        {
            // Driver (se specificato nei parametri aggiuntivi)
            if (credential.AdditionalParameters?.ContainsKey("Driver") == true)
            {
                builder.Add($"Driver={{{credential.AdditionalParameters["Driver"]}}}");
            }

            // Server/Host
            if (!string.IsNullOrEmpty(credential.Host))
            {
                builder.Add($"Server={credential.Host}");
                
                // Porta (se diversa da 0)
                if (credential.Port > 0)
                    builder.Add($"Port={credential.Port}");
            }

            // Database
            if (!string.IsNullOrEmpty(credential.DatabaseName))
                builder.Add($"Database={credential.DatabaseName}");

            // Credenziali
            if (!string.IsNullOrEmpty(credential.Username))
                builder.Add($"UID={credential.Username}");
            
            if (!string.IsNullOrEmpty(credential.Password))
                builder.Add($"PWD={credential.Password}");
        }

        // Timeout
        if (credential.CommandTimeout > 0)
            builder.Add($"Connection Timeout={credential.CommandTimeout}");

        // Parametri aggiuntivi (escludendo Driver se già aggiunto)
        if (credential.AdditionalParameters != null)
        {
            foreach (var param in credential.AdditionalParameters)
            {
                if (param.Key != "Driver") // Driver già gestito sopra
                    builder.Add($"{param.Key}={param.Value}");
            }
        }

        return string.Join(";", builder);
    }

    private static string BuildOleDbConnectionString(DatabaseCredential credential)
    {
        // Se è già presente una connection string personalizzata, utilizzala
        if (!string.IsNullOrEmpty(credential.ConnectionString))
            return credential.ConnectionString;

        var builder = new List<string>();

        // Provider OLE DB (obbligatorio)
        var provider = credential.AdditionalParameters?.GetValueOrDefault("Provider") ?? "VFPOLEDB.1";
        builder.Add($"Provider={provider}");

        // Data Source: per VFP e Access è il percorso file/cartella
        // DatabaseName è il campo principale (come per SQLite)
        var dataSource = !string.IsNullOrEmpty(credential.DatabaseName)
            ? credential.DatabaseName
            : credential.Host;

        if (!string.IsNullOrEmpty(dataSource))
            builder.Add($"Data Source={dataSource}");

        // Credenziali (opzionali per VFP file-based)
        if (!string.IsNullOrEmpty(credential.Username))
            builder.Add($"User ID={credential.Username}");

        if (!string.IsNullOrEmpty(credential.Password))
            builder.Add($"Password={credential.Password}");

        // Parametri aggiuntivi specifici (es. Collating Sequence, Exclusive, DELETED per VFP)
        if (credential.AdditionalParameters != null)
        {
            foreach (var param in credential.AdditionalParameters)
            {
                if (param.Key != "Provider") // Provider già gestito sopra
                    builder.Add($"{param.Key}={param.Value}");
            }
        }

        return string.Join(";", builder);
    }

    private static void AddAdditionalParameters(List<string> builder, Dictionary<string, string>? additionalParams)
    {
        if (additionalParams != null)
        {
            foreach (var param in additionalParams)
            {
                builder.Add($"{param.Key}={param.Value}");
            }
        }
    }
}