#region Namespaces
using System;
using System.IO;
using System.Linq;
#endregion

namespace ScriptCode
{ 
    /// <summary>
    /// Pattern scripts are used for recognizing and highlighting chart patterns.
    /// 
    /// This script can be used in several ways:
    /// (1) It can be used on a chart.
    /// (2) It can be used from another script.
    /// (3) It can be used as a script column in a watchlist.
    /// </summary>
    public partial class MyPattern : PatternScriptBase // NEVER CHANGE THE CLASS NAME 
    {
        #region Variables
		// The minimum percentage change (open to close) that a candlestick must change in order to be considered a long candlestick. 
		private double _minCandleSize;
		// The maximum percentage change a Doji can have between its opening and closing price.
		private double _maxDojiBodySize;
		// The maximum percentage change a Doji can have between its highest and lowest price. 
		private double _maxDojiShadowSizes;
        #endregion

        #region OnInitialize
        /// <summary>
        /// This function accepts the user parameters for the script and is called when a new pattern instance is created. 
        /// One of the parameters accepted by it must be that of a symbol or another script that is 
        /// based on a symbol (drawing, indicator, pattern or signal). This symbol will be used as the underlying symbol for the pattern.
        /// 
        /// The parameter values can be specified from the user interface (UI) or from another script, depending on usage.
        /// </summary>
        /// --------------------------------------------------------------------------------------------------
        /// PLEASE USE THE SCRIPT WIZARD (CTRL+W) TO ADD, EDIT AND REMOVE THE SCRIPT PARAMETERS
        /// --------------------------------------------------------------------------------------------------
        /// YOU MUST SET A PARAM TAG FOR EACH PARAMETER ACCEPTED BY THIS FUNCTION.
        /// ALL PARAM TAGS SHOULD BE SET IN THE 'OnInitialize' REGION, RIGHT ABOVE THE 'OnInitialize' FUNCTION.
        /// THE ORDER OF THE TAGS MUST MATCH THE ORDER OF THE ACTUAL PARAMETERS.

        /// REQUIRED ATTRIBUTES:
        /// (1) name: The exact parameter name.
        /// (2) type: The type of data to collect from the user: 
        /// Set to "Integer" when the data type is 'int'
        /// Set to "IntegerArray" when the data type is 'int[]'
        /// Set to "DateTime" when the data type is 'long'  
        /// Set to "DateTimeArray" when the data type is 'long[]'  
        /// Set to "Boolean" when the data type is 'bool'
        /// Set to "BooleanArray" when the data type is 'bool[]'
        /// Set to "Double" when the data type is 'double'
        /// Set to "DoubleArray" when the data type is 'double[]'
        /// Set to "String" when the data type is 'string'
        /// Set to "StringArray" when the data type is 'string[]'
        /// Set to "Indicator" when the data type is 'Indicator'
        /// Set to "Pattern" when the data type is 'Pattern'
        /// Set to "Signal" when the data type is 'Signal'
        /// Set to "Drawing" when the data type is 'Drawing'
        /// Set to "Symbol" when the data type is 'int' representing a symbol index.

        /// OPTIONAL ATTRIBUTES:
        /// (3) default: The default parameter value is only valid when the type is Integer, Boolean, Double, String or an API Type. 
        /// (4) min: The minimum parameter value is only valid when the type is Integer or Double.
        /// (5) max: The maximum parameter value is only valid when the type is Integer or Double.

        /// EXAMPLE: <param name="" type="" default="" min="" max="">Enter the parameter description here.</param> 
        /// --------------------------------------------------------------------------------------------------
		/// <param name="symbolIndex" type="Symbol" default="">The underlying symbol index on which to calculate the pattern script.</param>		
		/// <param name="minCandleSize" type="Double" default="1">The minimum percentage change (open to close) that a candlestick must change in order to be considered a long candlestick. </param>		
		/// <param name="maxDojiBodySize" type="Double" default="0.2">The maximum percentage change a Doji can have between its opening and closing price.</param>		
		/// <param name="maxDojiShadowSizes" type="Double" default="1">The maximum percentage change a Doji can have between its highest and lowest price. </param>       
		public void OnInitialize(int symbolIndex, double minCandleSize, double maxDojiBodySize, double maxDojiShadowSizes)
        {
			_minCandleSize = minCandleSize;
			_maxDojiBodySize = maxDojiBodySize;
			_maxDojiShadowSizes = maxDojiShadowSizes;
        }
        #endregion

        #region OnBarUpdate
        /// <summary>
        /// This function is used to determine whether a pattern match exists in which the latest bar is the last bar of the pattern.
        /// If such a pattern match is found, the function returns the number of bars in the pattern, otherwise it returns zero.
        /// </summary>
        /// <returns type="Integer">The total number of bars in the pattern ending at the latest bar (or zero if the pattern is not found).</returns>
        public override int OnBarUpdate()
        {
            // Check whether the first candlestick matches. 
			if (DataOpen(1) < DataClose(1) && 100 * (DataClose(1) - DataOpen(1)) / DataOpen(1) > _minCandleSize) {
				// Check whether the second candlestick matches. 
				if (DataHigh(1) < DataLow(0) && Math.Abs(100 * (DataOpen(0) - DataClose(0)) / DataOpen(0)) < _maxDojiBodySize && Math.Abs(100 * (DataHigh(0) - DataLow(0)) / DataHigh(0)) < _maxDojiShadowSizes) {
					return 2;
				}
			}
			return 0;
        }
        #endregion
    }
}