using Newtonsoft.Json;

namespace etoy
{
    static class StringExtensions
    {
        public static string ToTableName(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.Replace("\t", "").Replace("\r", "").Replace("\n", "").Trim();
        }

        public static string ToFieldType(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.Replace("\t", "").Replace("\r", "").Replace("\n", "").Trim().ToLower();
        }

        public static string ToFieldName(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.Replace("\t", "").Replace("\r", "").Replace("\n", "").Trim();
        }

        public static string ToTags(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.Replace("\t", "").Replace("\r", "").Replace("\n", "").Trim().ToLower();
        }

        public static string ToCellValue(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.ToString();
        }


        public static string ToDescription(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;

            return str.ToString();
        }


        public static string ToPath(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;
            return str.Replace("\\", "/");
        }


        public static string ToSqlString(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;
            return str.Replace("\'", "\'\'");
        }

        /// <summary>
        /// 将字符串转换为内置字符串的样式 " -> \" 
        /// </summary>
        /// <param name="str"></param>
        /// <returns></returns>
        public static string ToInlayString(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return str;
            return str.Replace("\"", "\\\"");
        }

        public static bool IsJsonString(this string str)
        {
            bool bRet = true;
            try
            {
                _ = JsonConvert.DeserializeObject(str);
            }
            catch (Exception)
            {
                bRet = false;
            }
            return bRet;
        }
        public static bool JsonToObject(this string str, Type type, out object? result)
        {
            var bRet = true;
            try
            {
                result = JsonConvert.DeserializeObject(str, type);
            }
            catch (Exception)
            {
                bRet = false;
                result = null;
            }
            return bRet;
        }


        public static bool IsKsonString(this string str)
        {
            if (string.IsNullOrEmpty(str))
                return false;

            int indent = 0;
            bool start = false, dot = false;
            bool end, invalid;

            for (int i = 0, length = str.Length; i < length; i++)
            {
                char c = str[i];

                // check end first
                end = c == '}' || c == ']';
                invalid = dot && end;
                if (invalid) return false;

                // set dot second
                var d = c == ',';
                if (dot && d) return false;
                dot = d;

                // check start last
                invalid = dot && start;
                if (invalid) return false;
                start = c == '[' || c == '{';

                if (start) indent++;
                if (end) indent--;

                // check all chars
                //invalid = !(c >= '0' && c <= '9'
                //            || c >= 'A' && c <= 'Z'
                //            || c >= 'a' && c <= 'z'
                //            || c == ' '
                //            || c == '_'
                //            || start
                //            || end
                //            || dot);

                if (invalid) return false;
            }
            return indent == 0;
        }
        /// <summary>
        /// 字符串首字母转大写
        /// </summary>
        /// <param name="val"></param>
        /// <returns></returns>
        public static string ToTitleCase(this string val)
        {
            //return CultureInfo.CurrentCulture.TextInfo.ToTitleCase(val);
            if (string.IsNullOrEmpty(val))
            {
                return val;
            }
            return char.ToUpper(val[0]) + val.Substring(1);
        }
    }
}