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

namespace SaveWizard_rewritten
{
    static class RegexHandler
    {
        private static List<string> lines;

        public static void FillLines(List<string> _lines)
        {
            lines = _lines;
        }

        public static string GetLine(int index)
        {
            return lines[index];
        }

        public static List<string> GetAllLines()
        {
            return lines;
        }

        public static int SearchLine(string term, int start = 0, string cancel = "this_string_must_not_exist")
        {
            if (lines[start].Contains(term))
                return start;
            start += 1;
            while (start <= (lines.Count-1)) {
                if (lines[start].Contains(term))
                    return start;
                if (lines[start].Contains(cancel))
                    return 0;
                start += 1;
            }
            return 0;
        }

        public static int SearchLineInUnit(string term, string unit)
        {
            return SearchLine(term, start: SearchLine(" : " + unit + " {"), cancel: "}");
        }

        public static List<int> SearchAllLines(string term)
        {
            List<int> matches = new List<int>();
            int line = 0;
            while (SearchLine(term, start: line + 1) != 0)
            {
                line = SearchLine(term, start: line + 1);
                matches.Add(line);
            }
            if (matches.Count == 0)
                return null;
            return matches;
        }

        public static string GetValue(int line)
        {
            return Regex.Match(": (.+)$", lines[line]).Value;
        }

        public static void SetValue(int line, string value)
        {
            string name = Regex.Match("(.+):", lines[line]).Value;
            lines[line] = $"{name}: {value}";
        }

        public static int GetArrayLength(int line)
        {
            return Convert.ToInt32(Regex.Match(": ([0-9]+)$", lines[line]).Value);
        }

        public static List<string> GetArrayItems(int line)
        {
            List<string> items = new List<string>();
            for (int i = 0; i < GetArrayLength(line); i++)
                items.Add(Regex.Match(": (.+)$", lines[line + i + 1]).Value);
            if (items.Count == 0)
                return null;
            return items;
        }

        public static void AddArrayValue(int line, string value)
        {
            string name = Regex.Match("(.+):", lines[line]).Value;
            int length = GetArrayLength(line);
            lines[line] = $"{name}: {length + 1}";
            lines.Insert(line + length + 1, $"{name}[{length}]: {value}");
        }
    }
}