namespace Yes.Infrastructure.ViewEngine
{
    internal class UriTemplateVariableQueryValue : UriTemplateQueryValue
    {
        private readonly string _varName;

        public UriTemplateVariableQueryValue(string varName)
            : base(UriTemplatePartType.Variable)
        {
            Ensure.NotNullOrEmpty(varName, "bad variable segment");
            _varName = varName;
        }
        public override void Bind(string keyName, string[] values, ref int valueIndex, StringBuilder query)
        {
            if (valueIndex < values.Length == false) throw new Exception("Not enough values to bind");
            if (values[valueIndex] == null)
            {
                valueIndex++;
            }
            else
            {
                query.AppendFormat("&{0}={1}", UrlUtility.UrlEncode(keyName, Encoding.UTF8), UrlUtility.UrlEncode(values[valueIndex++], Encoding.UTF8));
            }
        }

        public override bool IsEquivalentTo(UriTemplateQueryValue other)
        {
            Ensure.NotNull(other, "why would we ever call this?");
            //if (other == null) {
            //	Fx.Assert("why would we ever call this?");
            //	return false;
            //}
            return other.Nature == UriTemplatePartType.Variable;
        }
        public override void Lookup(string value, NameValueCollection boundParameters)
        {
            boundParameters.Add(_varName, value);
        }
    }
}