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

namespace ZA.CoreService.ESBCertificateManager.Services;

public sealed class SonicSetupRepository
{
    private readonly string _connectionString;

    public SonicSetupRepository(string connectionString)
    {
        if (string.IsNullOrWhiteSpace(connectionString))
        {
            throw new ArgumentException(
                "Der SQL-Connection-String fehlt.",
                nameof(connectionString));
        }

        _connectionString = connectionString;
    }

    public async Task<IReadOnlyList<SonicSystemOption>> GetSystemsAsync(
        string environmentCode,
        CancellationToken cancellationToken = default)
    {
        if (string.IsNullOrWhiteSpace(environmentCode))
        {
            throw new ArgumentException(
                "Der EnvironmentCode fehlt.",
                nameof(environmentCode));
        }

        const string sql = """
            SELECT
                connection.[SonicConnectionId],
                connection.[ConnectionName],
                environment.[EnvironmentCode],
                connection.[DomainName],
                connection.[ManagementHost],
                connection.[ManagementPort],
                connection.[ConnectionProtocol],
                MIN(container.[ContainerName])
                    AS [ValidationContainerName]
            FROM [dbo].[SonicConnection] AS connection
            INNER JOIN [dbo].[Environment] AS environment
                ON environment.[EnvironmentId] =
                   connection.[EnvironmentId]
            LEFT JOIN [dbo].[SonicContainer] AS container
                ON container.[SonicConnectionId] =
                   connection.[SonicConnectionId]
               AND container.[IsActive] = 1
            WHERE connection.[IsActive] = 1
              AND environment.[IsActive] = 1
              AND environment.[EnvironmentCode] =
                  @EnvironmentCode
            GROUP BY
                connection.[SonicConnectionId],
                connection.[ConnectionName],
                environment.[EnvironmentCode],
                connection.[DomainName],
                connection.[ManagementHost],
                connection.[ManagementPort],
                connection.[ConnectionProtocol]
            ORDER BY connection.[ConnectionName];
            """;

        List<SonicSystemOption> systems = [];

        await using SqlConnection connection =
            new(_connectionString);

        await connection.OpenAsync(cancellationToken);

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

        command.Parameters.Add(
            new SqlParameter(
                "@EnvironmentCode",
                SqlDbType.NVarChar,
                30)
            {
                Value = environmentCode
                    .Trim()
                    .ToUpperInvariant()
            });

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

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

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

        int environmentCodeOrdinal =
            reader.GetOrdinal("EnvironmentCode");

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

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

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

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

        int validationContainerNameOrdinal =
            reader.GetOrdinal("ValidationContainerName");

        while (await reader.ReadAsync(cancellationToken))
        {
            systems.Add(
                new SonicSystemOption
                {
                    SonicConnectionId =
                        reader.GetInt32(
                            sonicConnectionIdOrdinal),

                    ConnectionName =
                        reader.GetString(
                            connectionNameOrdinal),

                    EnvironmentCode =
                        reader.GetString(
                            environmentCodeOrdinal),

                    DomainName =
                        reader.IsDBNull(domainNameOrdinal)
                            ? string.Empty
                            : reader.GetString(
                                domainNameOrdinal),

                    ManagementHost =
                        reader.GetString(
                            managementHostOrdinal),

                    ManagementPort =
                        reader.GetInt32(
                            managementPortOrdinal),

                    ConnectionProtocol =
                        reader.IsDBNull(connectionProtocolOrdinal)
                            ? "tcp"
                            : reader.GetString(
                                connectionProtocolOrdinal),

                    ValidationContainerName =
                        reader.IsDBNull(
                            validationContainerNameOrdinal)
                            ? string.Empty
                            : reader.GetString(
                                validationContainerNameOrdinal)
                });
        }

        return systems;
    }

    public async Task<int> AddCredentialAsync(
        int sonicConnectionId,
        string credentialName,
        string userName,
        string secret,
        bool isDefault,
        CancellationToken cancellationToken = default)
    {
        if (sonicConnectionId <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(sonicConnectionId));
        }

        if (string.IsNullOrWhiteSpace(credentialName))
        {
            throw new ArgumentException(
                "Der Profilname fehlt.",
                nameof(credentialName));
        }

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

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

        string normalizedCredentialName =
            credentialName.Trim();

        string normalizedUserName =
            userName.Trim();

        if (normalizedCredentialName.Length > 150)
        {
            throw new ArgumentException(
                "Der Profilname darf maximal 150 Zeichen enthalten.",
                nameof(credentialName));
        }

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

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

        await using SqlConnection connection =
            new(_connectionString);

        await connection.OpenAsync(cancellationToken);

        await using SqlTransaction transaction =
            (SqlTransaction)
            await connection.BeginTransactionAsync(
                cancellationToken);

        try
        {
            if (isDefault)
            {
                const string clearDefaultSql = """
                    UPDATE [dbo].[SonicCredential]
                    SET
                        [IsDefault] = 0,
                        [ModifiedDateTime] = SYSUTCDATETIME(),
                        [ModifiedBy] = SUSER_SNAME()
                    WHERE [SonicConnectionId] =
                          @SonicConnectionId
                      AND [IsDefault] = 1;
                    """;

                await using SqlCommand clearDefaultCommand =
                    new(
                        clearDefaultSql,
                        connection,
                        transaction);

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

                await clearDefaultCommand.ExecuteNonQueryAsync(
                    cancellationToken);
            }

            const string insertSql = """
                INSERT INTO [dbo].[SonicCredential]
                (
                    [SonicConnectionId],
                    [CredentialName],
                    [CredentialUserName],
                    [CredentialSecret],
                    [IsDefault],
                    [IsActive],
                    [CreationDateTime],
                    [CreatedBy],
                    [ModifiedDateTime],
                    [ModifiedBy]
                )
                OUTPUT INSERTED.[SonicCredentialId]
                VALUES
                (
                    @SonicConnectionId,
                    @CredentialName,
                    @CredentialUserName,
                    @CredentialSecret,
                    @IsDefault,
                    1,
                    SYSUTCDATETIME(),
                    SUSER_SNAME(),
                    NULL,
                    NULL
                );
                """;

            await using SqlCommand insertCommand =
                new(
                    insertSql,
                    connection,
                    transaction);

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

            insertCommand.Parameters.Add(
                new SqlParameter(
                    "@CredentialName",
                    SqlDbType.NVarChar,
                    150)
                {
                    Value = normalizedCredentialName
                });

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

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

            insertCommand.Parameters.Add(
                new SqlParameter(
                    "@IsDefault",
                    SqlDbType.Bit)
                {
                    Value = isDefault
                });

            object? result =
                await insertCommand.ExecuteScalarAsync(
                    cancellationToken);

            if (result is null || result is DBNull)
            {
                throw new InvalidOperationException(
                    "Das Benutzerprofil konnte nicht angelegt werden.");
            }

            int credentialId =
                Convert.ToInt32(result);

            await transaction.CommitAsync(
                cancellationToken);

            return credentialId;
        }
        catch
        {
            try
            {
                await transaction.RollbackAsync(
                    CancellationToken.None);
            }
            catch
            {
                // Die ursprüngliche Exception soll erhalten bleiben.
            }

            throw;
        }
    }

    public async Task<IReadOnlyList<SonicCredentialProfile>>
        GetCredentialsAsync(
            int sonicConnectionId,
            CancellationToken cancellationToken = default)
    {
        if (sonicConnectionId <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(sonicConnectionId));
        }

        const string sql = """
            SELECT
                [SonicCredentialId],
                [SonicConnectionId],
                [CredentialName],
                [CredentialUserName],
                [CredentialSecret],
                [IsDefault],
                [IsActive]
            FROM [dbo].[SonicCredential]
            WHERE [SonicConnectionId] = @SonicConnectionId
              AND [IsActive] = 1
            ORDER BY
                [IsDefault] DESC,
                [CredentialName];
            """;

        List<SonicCredentialProfile> profiles = [];

        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
            });

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

        int credentialIdOrdinal =
            reader.GetOrdinal("SonicCredentialId");

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

        int credentialNameOrdinal =
            reader.GetOrdinal("CredentialName");

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

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

        int isDefaultOrdinal =
            reader.GetOrdinal("IsDefault");

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

        while (await reader.ReadAsync(cancellationToken))
        {
            string? userName =
                reader.IsDBNull(userNameOrdinal)
                    ? null
                    : reader.GetString(userNameOrdinal);

            string? secret =
                reader.IsDBNull(secretOrdinal)
                    ? null
                    : reader.GetString(secretOrdinal);

            if (string.IsNullOrWhiteSpace(userName)
                || string.IsNullOrEmpty(secret))
            {
                continue;
            }

            profiles.Add(
                new SonicCredentialProfile
                {
                    SonicCredentialId =
                        reader.GetInt32(
                            credentialIdOrdinal),

                    SonicConnectionId =
                        reader.GetInt32(
                            connectionIdOrdinal),

                    CredentialName =
                        reader.GetString(
                            credentialNameOrdinal),

                    UserName = userName,
                    Secret = secret,

                    IsDefault =
                        reader.GetBoolean(
                            isDefaultOrdinal),

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

        return profiles;
    }

    public async Task<SonicCredentialProfile?> GetCredentialByIdAsync(
        int sonicCredentialId,
        CancellationToken cancellationToken = default)
    {
        if (sonicCredentialId <= 0)
        {
            throw new ArgumentOutOfRangeException(
                nameof(sonicCredentialId));
        }

        const string sql = """
            SELECT
                [SonicCredentialId],
                [SonicConnectionId],
                [CredentialName],
                [CredentialUserName],
                [CredentialSecret],
                [IsDefault],
                [IsActive]
            FROM [dbo].[SonicCredential]
            WHERE [SonicCredentialId] = @SonicCredentialId
              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(
                "@SonicCredentialId",
                SqlDbType.Int)
            {
                Value = sonicCredentialId
            });

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

        if (!await reader.ReadAsync(cancellationToken))
        {
            return null;
        }

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

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

        string? userName =
            reader.IsDBNull(userNameOrdinal)
                ? null
                : reader.GetString(userNameOrdinal);

        string? secret =
            reader.IsDBNull(secretOrdinal)
                ? null
                : reader.GetString(secretOrdinal);

        if (string.IsNullOrWhiteSpace(userName)
            || string.IsNullOrEmpty(secret))
        {
            return null;
        }

        return new SonicCredentialProfile
        {
            SonicCredentialId =
                reader.GetInt32(
                    reader.GetOrdinal("SonicCredentialId")),

            SonicConnectionId =
                reader.GetInt32(
                    reader.GetOrdinal("SonicConnectionId")),

            CredentialName =
                reader.GetString(
                    reader.GetOrdinal("CredentialName")),

            UserName = userName,
            Secret = secret,

            IsDefault =
                reader.GetBoolean(
                    reader.GetOrdinal("IsDefault")),

            IsActive =
                reader.GetBoolean(
                    reader.GetOrdinal("IsActive"))
        };
    }
}