using System;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Documents;

using System.Windows.Ink;

using System.Windows.Input;

using System.Windows.Media;

using System.Windows.Media.Animation;

using System.Windows.Shapes;

using System.Collections.Generic;



// 2008 by Mario Meir-Huber

// Mail: mario_mh@vb-magazin.de

//       i-mameir@microsoft.com

namespace ChartLibrary.Data

{

    /// <summary>

    /// This is the main Data Object where the chart stores its data

    /// </summary>

    /// <history>

    ///     03/15/08: Design and Implementation for 0.1

    /// </history>

    public class DataModel : IDataChanged, IEnumerator<DataSource>, IEnumerable<DataSource>

    {

        private List<DataSource> _lst = null;       //this stores the data

        private double _min = 0.0;                  //the minimal value over all data sources

        private double _max = 0.0;                  //the maximal value over all data sources

        private object _tag = null;                 //tag to store custom data

        private int _enumpositon = -1;              //enumerator position



        public event ChartLibrary.Base.DataChangedEvent DataChanged; //delegate to changed data



        /// <summary>

        /// Initializes the Data Model

        /// </summary>

        public DataModel()

        {

            _lst = new List<DataSource>();

        }



        /// <summary>

        /// This is handled from the Child to Notify the Parent that data was changed

        /// </summary>

        /// <param name="sender"></param>

        public void NotifyDataChanged(object sender)

        {

            UpdateMinMax();



            if (null != DataChanged) DataChanged();

        }



        /// <summary>

        /// This updates the lowest and highest value

        /// </summary>

        /// <history>

        ///    03/18/08: Changed some logic

        /// </history>

        private void UpdateMinMax()

        {

            bool minset = false, maxset = false;

            if (_lst.Count < 1) return;



            for (int i = 0; i < _lst.Count; i++)

            {

                if (_lst[i].Length > 0)

                {

                    if (!minset)

                    {

                        _min = _lst[i].Min;

                        minset = true;

                    }



                    if (!maxset)

                    {

                        _max = _lst[i].Max;

                        maxset = true;

                    }



                    if (_lst[i].Max > _max) _max = _lst[i].Max;

                    if (_lst[i].Min < _min) _min = _lst[i].Min;

                }

            }

        }



        /// <summary>

        /// Adds a new Datasource to the Collection

        /// </summary>

        /// <returns>New Datasource Object</returns>

        public DataSource Add()

        {

            return Add("Unnamed Datasource");

        }



        /// <summary>

        /// Adds a new Datasource to the Collection

        /// </summary>

        /// <param name="name">Name of the object</param>

        /// <returns></returns>

        public DataSource Add(String name)

        {

            DataSource ds = new DataSource(this, name);

            return Add(ds);

        }



        /// <summary>

        /// Adds a new Datasource to the Collection

        /// </summary>

        /// <param name="data">Datasource Item</param>

        /// <returns></returns>

        public DataSource Add(DataSource data)

        {

            _lst.Add(data);

            return data;

        }



        /// <summary>

        /// Clears the list

        /// </summary>

        public void Clear()

        {

            _lst.Clear();

        }



        /// <summary>

        /// Removes an Item

        /// </summary>

        /// <param name="item"></param>

        public void Remove(DataSource item)

        {

            _lst.Remove(item);

        }



        /// <summary>

        /// Removes an item at the index

        /// </summary>

        /// <param name="index">Position</param>

        public void RemoveAt(int index)

        {

            _lst.RemoveAt(index);

        }



        /// <summary>

        /// Gets a Tag for the Class or sets it

        /// </summary>

        public object Tag

        {

            get { return _tag; }

            set { _tag = value; }

        }



        /// <summary>

        /// Gets the minimal value 

        /// </summary>

        public double Min

        {

            get { return _min; }

        }



        /// <summary>

        /// Gets the maximum value

        /// </summary>

        public double Max

        {

            get { return _max; }

        }



        /// <summary>

        /// This returns the count of the Data Sources

        /// </summary>

        public int Count

        {

            get { return _lst.Count; }

        }



        /// <summary>

        /// Gets the Datasource at the specified position or sets it

        /// </summary>

        /// <param name="i">Index</param>

        /// <returns></returns>

        public DataSource this[int i]

        {

            get

            {

                if (i >= _lst.Count) throw new IndexOutOfRangeException("The index is out of the bounds of the array");



                return _lst[i];

            }

            set

            {

                if (i >= _lst.Count) throw new IndexOutOfRangeException("The index is out of the bounds of the array");



                _lst[i] = value;

            }

        }



        #region IEnumerator<DataSource> Members



        public DataSource Current

        {

            get { return _lst[_enumpositon]; }

        }



        #endregion



        #region IDisposable Members



        public void Dispose()

        {

            _enumpositon = -1;

        }



        #endregion



        #region IEnumerator Members



        object System.Collections.IEnumerator.Current

        {

            get { return _lst[_enumpositon]; }

        }



        public bool MoveNext()

        {

            _enumpositon++;



            if (_enumpositon < _lst.Count) return true;

            else return false;

        }



        public void Reset()

        {

            _enumpositon = -1;

        }



        #endregion



        #region IEnumerable<DataSource> Members



        public IEnumerator<DataSource> GetEnumerator()

        {

            return this;

        }



        #endregion



        #region IEnumerable Members



        System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator()

        {

            return this;

        }



        #endregion

    }

}