// See https://aka.ms/new-console-template for more information
using AdventCommon;
using System.Collections;
using System.Net.Sockets;

var p1exampleSln = Part01("example-input.txt");
var p1puzzleSln = Part01("puzzle-input.txt");

Console.WriteLine("Part01 Example: " + p1exampleSln);
Console.WriteLine("Part01 Puzzle: " + p1puzzleSln);

long Part01(string fileName)
{
    Day05Input d = new Day05Input(fileName);

    List<long> locations = new List<long>();
    long min = long.MaxValue;
    foreach (var seed in d.Seeds)
    {
        long loc = Day05Input.MapEntry.GetConversion(seed.Number, d.Maps);
        locations.Add(loc);
        min = long.Min(loc, min);
    }

    return min;
}

class Day05Input : PuzzleInput
{
    public class MapEntry
    {
        public MapEntry(string line)
        {
            var split = line.Split(' ', StringSplitOptions.RemoveEmptyEntries);

            long dest = Int64.Parse(split[0]);
            long source = Int64.Parse(split[1]);
            long range = Int64.Parse(split[2]);

            SourceRangeStart = source;
            DestinationRangeStart = dest;
            Range = range;
        }

        public MapEntry(long sourceStart, long destStart, long length)
        {
            SourceRangeStart = sourceStart;
            DestinationRangeStart = destStart;
            Range = length;
        }

        public long SourceRangeStart { get; private set; }
        public long Range { get; private set; }
        public long DestinationRangeStart { get; private set; }

        public bool Contains(long val)
        {
            return (SourceRangeStart <= val && val < SourceRangeStart + Range);
        }

        public long GetDestinationCategory(long srcVal)
        {
            return DestinationRangeStart + (srcVal - SourceRangeStart);
        }

        public static long GetConversion(long val, List<MapEntry> entryMap)
        {
            foreach (var entry in entryMap)
            {
                if (entry.Contains(val))
                {
                    return (val - entry.SourceRangeStart) + entry.DestinationRangeStart;
                }
            }

            return val;
        }

        public static long GetConversion(long val, List<List<MapEntry>> Maps)
        {
            long currentVal = val;

            foreach (var entry in Maps)
            {
                currentVal = GetConversion(currentVal, entry);
            }

            return currentVal;
        }
    }

    public class Seed
    {
        public Seed(long number)
        {
            Number = number;
        }

        public long Number { get; private set; }
    }

    public List<Seed>       Seeds                   { get; private set; } = new List<Seed>();

    public List<MapEntry>   SeedToSoil              { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   SoilToFertilizer        { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   FertilizerToWater       { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   WaterToLight            { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   LightToTemperature      { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   TemperatureToHumidity   { get; private set; } = new List<MapEntry>();
    public List<MapEntry>   HumidityToLocation      { get; private set; } = new List<MapEntry>();

    public List<List<MapEntry>>    Maps        { get; private set; } = new List<List<MapEntry>>();

    public Day05Input(string fileName, bool isPart02 = false) : base(fileName, false)
    {
        Maps.Add(SeedToSoil);
        Maps.Add(SoilToFertilizer);
        Maps.Add(FertilizerToWater);
        Maps.Add(WaterToLight);
        Maps.Add(LightToTemperature);
        Maps.Add(TemperatureToHumidity);
        Maps.Add(HumidityToLocation);

        int currentMap = -1;

        foreach (var line in Lines)
        {
            // Read the seeds line
            if (Seeds.Count == 0)
            {
                // First line is seeds
                if (!line.Split(':')[0].Equals("seeds"))
                {
                    throw new InvalidDataException("Expected seeds");
                }

                if (!isPart02)
                {
                    var seeds = line.Split(':')[1].Split(' ', StringSplitOptions.RemoveEmptyEntries);
                    foreach (var seed in seeds)
                    {
                        Seeds.Add(new Seed(Int64.Parse(seed)));
                    }
                }
                else 
                {
                    var seeds = line.Split(':')[1].Split(' ', StringSplitOptions.RemoveEmptyEntries);

                    if (!(seeds.Length % 2 == 0)) throw new InvalidDataException("Uneven seed count");

                    for (int i = 0; i < seeds.Length; i+=2)
                    {

                    }
                }
                
                continue;
            }

            if (String.IsNullOrWhiteSpace(line)) continue;

            if (line.Contains("map:"))
            {
                // Move to the next map
                currentMap++;
            }
            else
            {
                Maps[currentMap].Add(new MapEntry(line));
            }
        }
    }
}