using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Text.RegularExpressions;

namespace axXez.TS3.Protocol
{
    /// <summary>Parsed result of a ServerQuery command — includes the error code, error message, raw response text, and all key-value entries.</summary>
    public class QueryResponse : TsMessage
    {
        private static readonly Regex _parseRegex = new(@"error id=(?<id>[0-9]+) msg=(?<msg>.*)", RegexOptions.Compiled);

        /// <summary>ServerQuery error code string; <c>"0"</c> means success.</summary>
        public string ErrorCode { get; private set; }
        /// <summary>Human-readable error message; <c>"ok"</c> on success.</summary>
        public string ErrorMsg { get; private set; }
        /// <summary>Stack trace captured at the call site when the response has an error. <c>null</c> on success.</summary>
        public StackTrace StackTrace { get; private set; }
        /// <summary>Whether the response contains an error (i.e. <see cref="ErrorCode"/> is not <c>"0"</c>).</summary>
        public bool HasError { get; private set; }

        internal QueryResponse(string commandName, string data, string errorCode, string errorMsg) : base(commandName, data)
        {
            ErrorCode = errorCode;
            ErrorMsg = errorMsg;

            if (!ErrorCode.Equals("0"))
            {
                StackTrace = new StackTrace();
                HasError = true;
            }
        }

        internal static QueryResponse Parse(string commandName, params IEnumerable<string> lines)
        {
            var groups = _parseRegex.Match(lines.Last()).Groups;

            var errorCode = groups["id"].Value;
            var errorMsg = groups["msg"].Value.FromTsFormat();
            var data = string.Join("\n", lines.SkipLast(1));

            return new(commandName, data, errorCode, errorMsg);
        }

        internal void SetStackTrace(StackTrace stackTrace)
        {
            StackTrace = stackTrace;
        }

        //internal Dictionary<string, string> ToDictionary()
        //{
        //    var dict = new Dictionary<string, string>
        //    {
        //        ["errorCode"] = ErrorCode,
        //        ["errorMessage"] = ErrorMsg
        //    };
        //    if (HasData)
        //        foreach (var kvp in Entries[0].ToDictionary())
        //            dict.TryAdd(kvp.Key, kvp.Value);
        //    return dict;
        //}
    }
}