using System.Collections.Generic;
using System.IO;

namespace Amanotes.Core
{
    internal static class CscRspFile
    {
        private const string DefaultPath = "Assets/csc.rsp";

        internal static HashSet<string> Parse(string path = DefaultPath)
        {
            var result = new HashSet<string>();
            if (!File.Exists(path)) return result;

            var lines = File.ReadAllLines(path);
            for (int i = 0; i < lines.Length; i++)
            {
                var trimmed = lines[i].Trim();
                if (!trimmed.StartsWith("-define:")) continue;
                var symbols = trimmed.Substring(8).Split(';');
                for (int j = 0; j < symbols.Length; j++)
                {
                    var s = symbols[j].Trim();
                    if (s.Length > 0) result.Add(s);
                }
            }

            return result;
        }

        internal static void Write(HashSet<string> symbols, string path = DefaultPath)
        {
            string content = symbols.Count > 0
                ? "-define:" + string.Join(";", symbols)
                : string.Empty;
            File.WriteAllText(path, content);
        }

        internal static bool Exists(string path = DefaultPath) => File.Exists(path);
    }
}