using System.Collections.Generic;
using System.Text;

namespace AddInPlugin.Util
{
    public class ExpressUtil
    {
        /// <summary>
        /// 按逗号分割字符串，忽略引号内的逗号
        /// </summary>
        /// <param name="input">输入字符串</param>
        /// <param name="trim">是否去除每项首尾空格</param>
        /// <param name="removeEmpty">是否移除空项</param>
        /// <returns>分割后的数组</returns>
        public static string[] SplitIgnoringQuotes(string input, bool trim = false, bool removeEmpty = true, char escapeChar = '\\')
        {
            if (string.IsNullOrEmpty(input))
                return new string[0];

            List<string> result = new List<string>();
            StringBuilder current = new StringBuilder();
            bool inQuotes = false;
            int parenDepth = 0;  // 圆括号嵌套深度
            int bracketDepth = 0; // 方括号嵌套深度

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

                // 处理转义引号：\" 表示引号字符本身，不是引号边界
                if (c == escapeChar && i + 1 < input.Length && input[i + 1] == '"')
                {
                    current.Append('"');
                    i++; // 跳过下一个字符（引号字符）
                    continue;
                }

                // 处理引号边界
                if (c == '"')
                {
                    inQuotes = !inQuotes;
                    current.Append(c);
                    continue;
                }

                // 如果在引号内，直接添加字符
                if (inQuotes)
                {
                    current.Append(c);
                    continue;
                }

                // 处理圆括号
                if (c == '(')
                {
                    parenDepth++;
                    current.Append(c);
                    continue;
                }
                else if (c == ')')
                {
                    if (parenDepth > 0)
                        parenDepth--;
                    current.Append(c);
                    continue;
                }

                if (c == '[')
                {
                    bracketDepth++;
                    current.Append(c);
                    continue;
                }
                else if (c == ']')
                {
                    if (bracketDepth > 0)
                        bracketDepth--;
                    current.Append(c);
                    continue;
                }

                // 处理逗号分隔符（不在引号内，不在括号内，不在方括号内）
                if (c == ',' && parenDepth == 0 && bracketDepth == 0)
                {
                    AddItem(result, current, trim, removeEmpty);
                    current.Clear();
                    continue;
                }

                // 其他字符，直接添加
                current.Append(c);
            }

            // 添加最后一项
            AddItem(result, current, trim, removeEmpty);

            return result.ToArray();
        }

        private static void AddItem(List<string> result, StringBuilder current, bool trim, bool removeEmpty)
        {
            string item = trim ? current.ToString().Trim() : current.ToString();
            if (!removeEmpty || !string.IsNullOrEmpty(item))
                result.Add(item);
        }
    }
}