using FastReport.Utils;
using System.Collections;

namespace FastReport.Data
{
    /// <summary>
    /// Represents the collection of <see cref="DataSourceBase"/> objects.
    /// </summary>
    public class DataSourceCollection : FRCollectionBase
    {
        /// <summary>
        /// Gets or sets a data source.
        /// </summary>
        /// <param name="index">The index of a data source in this collection.</param>
        /// <returns>The data source with specified index.</returns>
        public DataSourceBase this[int index]
        {
            get { return List[index] as DataSourceBase; }
            set { List[index] = value; }
        }

        /// <summary>
        /// Finds a datasource by its name.
        /// </summary>
        /// <param name="name">The name of a datasource.</param>
        /// <returns>The <see cref="DataSourceBase"/> object if found; otherwise <b>null</b>.</returns>
        public DataSourceBase FindByName(string name)
        {
            foreach (DataSourceBase c in this)
            {
                if (c.Name == name)
                    return c;
            }
            return null;
        }

        /// <summary>
        /// Finds a datasource by its alias.
        /// </summary>
        /// <param name="alias">The alias of a datasource.</param>
        /// <returns>The <see cref="DataSourceBase"/> object if found; otherwise <b>null</b>.</returns>
        public DataSourceBase FindByAlias(string alias)
        {
            foreach (DataSourceBase c in this)
            {
                if (c.Alias == alias)
                    return c;
            }
            return null;
        }

        /// <summary>
        /// Sorts data sources by their names.
        /// </summary>
        public void Sort()
        {
            InnerList.Sort(new DataSourceComparer());
        }

        /// <summary>
        /// Initializes a new instance of the <see cref="DataSourceCollection"/> class with default settings.
        /// </summary>
        /// <param name="owner">The owner of this collection.</param>
        public DataSourceCollection(Base owner) : base(owner)
        {
        }
    }

    /// <summary>
    /// Represents the comparer class that used for sorting the collection of data sources.
    /// </summary>
    public class DataSourceComparer : IComparer
    {
        /// <inheritdoc/>
        public int Compare(object x, object y)
        {
            string xValue = (x as DataSourceBase).Alias;
            string yValue = (y as DataSourceBase).Alias;
            return xValue.CompareTo(yValue);
        }
    }
}