using System;

using System.Collections.Generic;

using System.Linq;

​

//Settings: C#, Compiler .NET 7

public class InventoryInit

{

    private static string[] HeaderData = GetSerializedPlayerInventoryHeaders().Split(',');

    private static string[] InventoryData = GetSerializedPlayerInventory().Split("\n");

    // header,header,header

    // data

    // data

    // data

    public static void Main()

    {   

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

            Console.Write(HeaderData[i]);

            Console.Write(" ");

        }

        Console.WriteLine("\n");

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

            Console.WriteLine(InventoryData[i]);

        }

        Console.WriteLine("------------------------------");

        //Prompt 1: Build the user's inventory using the stubbed class InventoryItem, print inventory to console 

        // done

        //Prompt 2: Write a wrapper for the InventoryItems with a method to return the best WEAPON 

        var weapons = InventoryData.Select(item => {

            var fields = item.Split(',');

            var hasLevel = Int32.TryParse(fields[2], out var level);

            return new InventoryItem(fields[0], fields[1], hasLevel ? level : 0, fields[3]);

        }).Where(i => i.Type == "WEAPON");

        var bestWeapon = WeaponChooser.ChooseBestWeapon(weapons);

        Console.WriteLine("Best weapon is {0}", bestWeapon);

        //Prompt 3: Discuss what you would change for improved maintainability / optimization / reusability or anything else you find important in development 

        // condense the serialized format - use enums, etc

        // record type

    }

    public record InventoryItem(string ID, string Type, int WeaponLevel, string Quality);

    public static class WeaponChooser

    {

        public static InventoryItem ChooseBestWeapon(IEnumerable<InventoryItem> inventoryItems)

        {

            if (inventoryItems is null || !inventoryItems.Any())

                throw new InvalidOperationException("No items to choose from");

            // first by max level, then by quality

            return inventoryItems.GroupBy(i => i.WeaponLevel, i => i).MaxBy(i => i.Key).FirstOrDefault();

        }

    }

    //Fake database store of inventory

    private static string GetSerializedPlayerInventoryHeaders(){

        return "ID,Category,Level,Quality";

    }

    private static string GetSerializedPlayerInventory(){

        const string playerInventoryData = @"rusty_sword,WEAPON,1,Bronze

                                            fire_sword,WEAPON,3,Silver

                                            bucket,TOOL,,Gold

                                            helmet,DEFENCE,4,Silver

                                            single_shoe,DEFENCE,1,Bronze

                                            boots,DEFENCE,3,Silver

                                            running_boots,DEFENCE,2,Gold

                                            master_sword,WEAPON,10,Gold";

        return playerInventoryData.Replace("\t", "");

    }

}