using System.Data;
using Microsoft.Data.SqlClient;
using ZA.CoreService.ESBCertificateManager.Models;

namespace ZA.CoreService.ESBCertificateManager.Services;

public sealed class SonicConnectionRepository
{
    private readonly string _connectionString;

    public SonicConnectionRepository(
        string connectionString)
    {
        if (string.IsNullOrWhiteSpace(connectionString))
        {
            throw new ArgumentException(
                "Der SQL-Connection-String ist nicht konfiguriert.",
                nameof(connectionString));
        }

        _connectionString = connectionString;
    }

    public async Task<IReadOnlyList<DatabaseSonicConnection>>
        GetActiveAsync(
            CancellationToken cancellationToken = default)
    {
        const string sql = """
            SELECT
                SonicConnectionId,
                ConnectionName,
                ManagementHost,
                ManagementPort,
                ConnectionProtocol,
                DomainName,
                CredentialUserName,
                CredentialReference,
                CredentialSecret,
                JavaHomePath,
                SonicHomePath,
                Notes,
                IsActive
            FROM dbo.SonicConnection
            WHERE IsActive = 1
            ORDER BY ConnectionName;
            """;

        List<DatabaseSonicConnection> connections = [];

        await using SqlConnection connection =
            new(_connectionString);

        await connection.OpenAsync(cancellationToken);

        await using SqlCommand command =
            new(sql, connection);

        await using SqlDataReader reader =
            await command.ExecuteReaderAsync(
                cancellationToken);

        int idOrdinal =
            reader.GetOrdinal("SonicConnectionId");

        int nameOrdinal =
            reader.GetOrdinal("ConnectionName");

        int hostOrdinal =
            reader.GetOrdinal("ManagementHost");

        int portOrdinal =
            reader.GetOrdinal("ManagementPort");

        int protocolOrdinal =
            reader.GetOrdinal("ConnectionProtocol");

        int domainOrdinal =
            reader.GetOrdinal("DomainName");

        int userNameOrdinal =
            reader.GetOrdinal("CredentialUserName");

        int credentialReferenceOrdinal =
            reader.GetOrdinal("CredentialReference");

        int credentialSecretOrdinal =
            reader.GetOrdinal("CredentialSecret");

        int javaHomeOrdinal =
            reader.GetOrdinal("JavaHomePath");

        int sonicHomeOrdinal =
            reader.GetOrdinal("SonicHomePath");

        int notesOrdinal =
            reader.GetOrdinal("Notes");

        int isActiveOrdinal =
            reader.GetOrdinal("IsActive");

        while (await reader.ReadAsync(cancellationToken))
        {
            connections.Add(
                new DatabaseSonicConnection
                {
                    Id = reader.GetInt32(idOrdinal),

                    Name =
                        reader.GetString(nameOrdinal),

                    ManagementHost =
                        reader.GetString(hostOrdinal),

                    ManagementPort =
                        ReadNullableInt32(
                            reader,
                            portOrdinal),

                    ConnectionProtocol =
                        ReadNullableString(
                            reader,
                            protocolOrdinal),

                    DomainName =
                        ReadNullableString(
                            reader,
                            domainOrdinal),

                    CredentialUserName =
                        ReadNullableString(
                            reader,
                            userNameOrdinal),

                    CredentialReference =
                        ReadNullableString(
                            reader,
                            credentialReferenceOrdinal),

                    CredentialSecret =
                        ReadNullableString(
                            reader,
                            credentialSecretOrdinal),

                    JavaHomePath =
                        ReadNullableString(
                            reader,
                            javaHomeOrdinal),

                    SonicHomePath =
                        ReadNullableString(
                            reader,
                            sonicHomeOrdinal),

                    Notes =
                        ReadNullableString(
                            reader,
                            notesOrdinal),

                    IsActive =
                        reader.GetBoolean(
                            isActiveOrdinal)
                });
        }

        return connections;
    }

    public async Task SaveCredentialsAsync(
        int sonicConnectionId,
        string credentialUserName,
        string credentialSecret,
        CancellationToken cancellationToken = default)
    {
        if (sonicConnectionId <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(sonicConnectionId),
                "Die SonicConnectionId ist ungültig.");
        }

        if (string.IsNullOrWhiteSpace(
                credentialUserName))
        {
            throw new ArgumentException(
                "Der Sonic-Benutzername fehlt.",
                nameof(credentialUserName));
        }

        if (string.IsNullOrEmpty(
                credentialSecret))
        {
            throw new ArgumentException(
                "Das Sonic-Kennwort fehlt.",
                nameof(credentialSecret));
        }

        string normalizedUserName =
            credentialUserName.Trim();

        if (normalizedUserName.Length > 256)
        {
            throw new ArgumentException(
                "Der Sonic-Benutzername darf maximal 256 Zeichen enthalten.",
                nameof(credentialUserName));
        }

        if (credentialSecret.Length > 512)
        {
            throw new ArgumentException(
                "Das Sonic-Kennwort darf maximal 512 Zeichen enthalten.",
                nameof(credentialSecret));
        }

        const string sql = """
            UPDATE dbo.SonicConnection
            SET
                CredentialUserName = @CredentialUserName,
                CredentialSecret = @CredentialSecret,
                UpdatedAtUtc = SYSUTCDATETIME()
            WHERE SonicConnectionId = @SonicConnectionId
              AND IsActive = 1;
            """;

        await using SqlConnection connection =
            new(_connectionString);

        await connection.OpenAsync(cancellationToken);

        await using SqlCommand command =
            new(sql, connection);

        command.Parameters.Add(
            new SqlParameter(
                "@CredentialUserName",
                SqlDbType.NVarChar,
                256)
            {
                Value = normalizedUserName
            });

        command.Parameters.Add(
            new SqlParameter(
                "@CredentialSecret",
                SqlDbType.NVarChar,
                512)
            {
                Value = credentialSecret
            });

        command.Parameters.Add(
            new SqlParameter(
                "@SonicConnectionId",
                SqlDbType.Int)
            {
                Value = sonicConnectionId
            });

        int affectedRows =
            await command.ExecuteNonQueryAsync(
                cancellationToken);

        if (affectedRows != 1)
        {
            throw new InvalidOperationException(
                "Die aktive Sonic-Verbindung wurde nicht eindeutig gefunden.");
        }
    }

    public async Task ClearCredentialsAsync(
        int sonicConnectionId,
        CancellationToken cancellationToken = default)
    {
        if (sonicConnectionId <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(sonicConnectionId),
                "Die SonicConnectionId ist ungültig.");
        }

        const string sql = """
            UPDATE dbo.SonicConnection
            SET
                CredentialUserName = NULL,
                CredentialSecret = NULL,
                UpdatedAtUtc = SYSUTCDATETIME()
            WHERE SonicConnectionId = @SonicConnectionId;
            """;

        await using SqlConnection connection =
            new(_connectionString);

        await connection.OpenAsync(cancellationToken);

        await using SqlCommand command =
            new(sql, connection);

        command.Parameters.Add(
            new SqlParameter(
                "@SonicConnectionId",
                SqlDbType.Int)
            {
                Value = sonicConnectionId
            });

        int affectedRows =
            await command.ExecuteNonQueryAsync(
                cancellationToken);

        if (affectedRows != 1)
        {
            throw new InvalidOperationException(
                "Die Sonic-Verbindung wurde nicht eindeutig gefunden.");
        }
    }

    private static string? ReadNullableString(
        SqlDataReader reader,
        int ordinal)
    {
        return reader.IsDBNull(ordinal)
            ? null
            : reader.GetString(ordinal);
    }

    private static int? ReadNullableInt32(
        SqlDataReader reader,
        int ordinal)
    {
        return reader.IsDBNull(ordinal)
            ? null
            : reader.GetInt32(ordinal);
    }
}