using MySql.Data.MySqlClient;

namespace HikvisionAttendanceService.Data;

internal sealed class MySqlHrmsDbConnectionFactory : IHrmsDbConnectionFactory
{
    private readonly HikvisionAttendanceWindowsService.HikvisionServiceConfig _config;

    public MySqlHrmsDbConnectionFactory(HikvisionAttendanceWindowsService.HikvisionServiceConfig config)
    {
        _config = config;
    }

    public string BuildConnectionStringMasked()
    {
        if (TryBuildConnectionString(out var cs, out _))
        {
            var b = new MySqlConnectionStringBuilder(cs);
            b.Password = "***";
            return b.ConnectionString;
        }
        return "(invalid)";
    }

    public bool TryBuildConnectionString(out string connectionString, out string error)
    {
        connectionString = "";
        error = "";
        if (!string.IsNullOrWhiteSpace(_config.DbConnectionString))
        {
            connectionString = _config.DbConnectionString.Trim();
            return true;
        }

        if (string.IsNullOrWhiteSpace(_config.DbHost) ||
            string.IsNullOrWhiteSpace(_config.DbUsername) ||
            string.IsNullOrWhiteSpace(_config.DbName))
        {
            error = "DbHost/DbUsername/DbName are required when DbConnectionString is empty.";
            return false;
        }

        var b = new MySqlConnectionStringBuilder
        {
            Server = _config.DbHost.Trim(),
            Port = (uint)(_config.DbPort > 0 ? _config.DbPort : 3306),
            Database = _config.DbName.Trim(),
            UserID = _config.DbUsername.Trim(),
            Password = _config.DbPassword ?? "",
            DefaultCommandTimeout = 30
        };
        connectionString = b.ConnectionString;
        return true;
    }
}