using System;
using xExceptions.Constants;
using xExceptions.Models;

namespace xCommons.Extensions {
    /// <summary>
    /// this is an extension pack for Exceptions
    /// </summary>
    public static partial class ExceptionExtensions {

        /// <summary>
        /// determines an string contains an XError content or not
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static bool IsXError (this string source) {
            //
            if (source.IsNullOrEmpty ()) {
                return false;
            }

            //
            var xError = source.ToXError ();
            if (xError != null) {
                return true;
            }

            // 
            // If Convert Proccess fails ...
            var normalString = source.ToNormalString ();

            //
            // Return result based on string values ...
            return normalString.Contains ("id") && normalString.Contains ("message");
        }

        /// <summary>
        /// deserialize an string to to XError class instance
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static XError ToXError (this string source) {
            //
            if (source.IsNullOrEmpty ()) {
                return null;
            }

            //
            try {
                //
                var err = source.FromJSON<XError> ();

                //
                // if err is null we have to manually get value
                if (err == null) {
                    //
                    var normalString = source.ToNormalString ();
                    var parts = normalString.Split (',');
                    if (parts.Length > 2) {
                        return null;
                    }

                    //
                    var idContainer = parts[0];
                    var messageContainer = parts[1];
                }

                //
                return err;
            } catch {
                return null;
            }
        }

        public static XError ToXError (this XException source) {
            //
            var errorId = (int) source;
            var errorMessage = source.GetStringValue ();

            //
            return new XError {
                Id = errorId,
                    Message = errorMessage
            };
        }

        /// <summary>
        /// Convert an XError instance to an Exception
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static Exception ToException (this XError source) {
            //
            var jsonStr = source.ToJSON ();
            return new Exception (jsonStr);
        }

        public static Exception ToException (this XException source) {
            return source
                .ToXError ()
                .ToException ();
        }

        /// <summary>
        /// Convert an Exception to corresponding XError Object
        /// </summary>
        /// <param name="source"></param>
        /// <returns></returns>
        public static XError FromException (this Exception source) {
            //
            if (source == null || source.Message.IsNullOrEmpty ()) {
                return null;
            }

            //
            return source.Message.ToXError ();
        }

        /// <summary>
        /// Add Content to Contentable XException member and return XError Object
        /// </summary>
        /// <param name="exception"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static XError AddContentToError (this XException exception, string value) {
            //
            var xError = exception.ToXError ();
            xError.Message = string.Format (xError.Message, value);

            //
            return xError;
        }

        /// <summary>
        /// Add Content to Contentable XException member and return Exception Object
        /// </summary>
        /// <param name="exception"></param>
        /// <param name="value"></param>
        /// <returns></returns>
        public static Exception AddContentToException (this XException exception, string value) {
            //
            var xError = exception.ToXError ();
            xError.Message = string.Format (xError.Message, value);

            //
            return xError.ToException ();
        }

        /// <summary>
        /// Throw Specific Exception ...
        /// </summary>
        /// <param name="source"></param>
        /// <param name="content"></param>
        public static void Throw (
            this XException source,
            string content = null
        ) {
            //
            Exception exception = null;
            if (content.IsNullOrEmpty ()) {
                exception = source.ToException ();
            } else {
                exception = source.AddContentToException (content);
            }

            //
            throw exception;
        }
    }
}