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{{>partial_header}}

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace {{packageName}}.Client
{
    /// 
    /// Utility functions providing some benefit to API client consumers.
    /// 
    public static class ClientUtils
    {
        /// 
        /// Sanitize filename by removing the path
        /// 
        /// Filename
        /// Filename
        public static string SanitizeFilename(string filename)
        {
            Match match = Regex.Match(filename, @".*[/\\](.*)$");
            return match.Success ? match.Groups[1].Value : filename;
        }

        /// 
        /// Convert params to key/value pairs. 
        /// Use collectionFormat to properly format lists and collections.
        /// 
        /// The swagger-supported collection format, one of: csv, tsv, ssv, pipes, multi
        /// Key name.
        /// Value object.
        /// A multimap of keys with 1..n associated values.
        public static Multimap ParameterToMultiMap(string collectionFormat, string name, object value)
        {
            var parameters = new Multimap();

            if (IsCollection(value) && collectionFormat == "multi")
            {
                var valueCollection = value as IEnumerable;
                if (valueCollection != null)
                {
                    foreach (var item in valueCollection)
                    {
                        parameters.Add(name, ParameterToString(item));
                    }
                }
            }
            else
            {
                parameters.Add(name, ParameterToString(value));
            }

            return parameters;
        }
        
        /// 
        /// If parameter is DateTime, output in a formatted string (default ISO 8601), customizable with Configuration.DateTime.
        /// If parameter is a list, join the list with ",".
        /// Otherwise just return the string.
        /// 
        /// The parameter (header, path, query, form).
        /// An optional configuration instance, providing formatting options used in processing.
        /// Formatted string.
        public static string ParameterToString(object obj, IReadableConfiguration configuration = null)
        {
            if (obj is DateTime)
                // Return a formatted date string - Can be customized with Configuration.DateTimeFormat
                // Defaults to an ISO 8601, using the known as a Round-trip date/time pattern ("o")
                // https://msdn.microsoft.com/en-us/library/az4se3k1(v=vs.110).aspx#Anchor_8
                // For example: 2009-06-15T13:45:30.0000000
                return ((DateTime)obj).ToString((configuration ?? GlobalConfiguration.Instance).DateTimeFormat);
            else if (obj is DateTimeOffset)
                // Return a formatted date string - Can be customized with Configuration.DateTimeFormat
                // Defaults to an ISO 8601, using the known as a Round-trip date/time pattern ("o")
                // https://msdn.microsoft.com/en-us/library/az4se3k1(v=vs.110).aspx#Anchor_8
                // For example: 2009-06-15T13:45:30.0000000
                return ((DateTimeOffset)obj).ToString((configuration ?? GlobalConfiguration.Instance).DateTimeFormat);
            else
            {
                if (obj is IList)
                {
                    var list = obj as IList;
                    var flattenedString = new StringBuilder();
                    foreach (var param in list)
                    {
                        if (flattenedString.Length > 0)
                            flattenedString.Append(",");
                        flattenedString.Append(param);
                    }
                    return flattenedString.ToString();
                }
                
                return Convert.ToString (obj);
            }
        }
        
        /// 
        /// Check if generic object is a collection.
        /// 
        /// 
        /// True if object is a collection type
        private static bool IsCollection(object value)
        {
            return value is IList || value is ICollection;
        }
        
        /// 
        /// URL encode a string
        /// Credit/Ref: https://github.com/restsharp/RestSharp/blob/master/RestSharp/Extensions/StringExtensions.cs#L50
        /// 
        /// String to be URL encoded
        /// Byte array
        public static string UrlEncode(string input)
        {
            const int maxLength = 32766;

            if (input == null)
            {
                throw new ArgumentNullException("input");
            }

            if (input.Length <= maxLength)
            {
                return Uri.EscapeDataString(input);
            }

            StringBuilder sb = new StringBuilder(input.Length * 2);
            int index = 0;

            while (index < input.Length)
            {
                int length = Math.Min(input.Length - index, maxLength);
                string subString = input.Substring(index, length);

                sb.Append(Uri.EscapeDataString(subString));
                index += subString.Length;
            }

            return sb.ToString();
        }

        /// 
        /// Encode string in base64 format.
        /// 
        /// String to be encoded.
        /// Encoded string.
        public static string Base64Encode(string text)
        {
            return System.Convert.ToBase64String(System.Text.Encoding.UTF8.GetBytes(text));
        }

        /// 
        /// Convert stream to byte array
        /// 
        /// Input stream to be converted
        /// Byte array
        public static byte[] ReadAsBytes(Stream inputStream)
        {
            byte[] buf = new byte[16*1024];
            using (MemoryStream ms = new MemoryStream())
            {
                int count;
                while ((count = inputStream.Read(buf, 0, buf.Length)) > 0)
                {
                    ms.Write(buf, 0, count);
                }
                return ms.ToArray();
            }
        }

        /// 
        /// Dynamically cast the object into target type.
        /// 
        /// Object to be casted
        /// Target type
        /// Casted object
        {{#supportsAsync}}
        public static dynamic ConvertType(dynamic fromObject, Type toObject)
        {{/supportsAsync}}
        {{^supportsAsync}}
        public static object ConvertType(T fromObject, Type toObject) where T : class
        {{/supportsAsync}}
        {
            return Convert.ChangeType(fromObject, toObject);
}
    }
}