using System;
using System.Collections.Generic;

namespace Umbraco.Core.Persistence.Querying
{
    /// <summary>
    /// SD: This is a horrible hack but unless we break compatibility with anyone who's actually implemented IQuery{T} there's not much we can do.
    /// The IQuery{T} interface is useless without having a GetWhereClauses method and cannot be used for tests.
    /// We have to wait till v8 to make this change I suppose.
    /// </summary>
    internal static class QueryExtensions
    {
        /// <summary>
        /// Returns all translated where clauses and their sql parameters
        /// </summary>
        /// <returns></returns>
        public static IEnumerable<Tuple<string, object[]>> GetWhereClauses<T>(this IQuery<T> query)
        {
            var q = query as Query<T>;
            if (q == null)
            {
                throw new NotSupportedException(typeof(IQuery<T>) + " cannot be cast to " + typeof(Query<T>));
            }
            return q.GetWhereClauses();
        }
    }
}