using System;
using System.Collections.Generic;
using System.Linq;
using UnityEditor.Tilemaps;

[Serializable]
public class Inventory : IDataPersistence<InventoryData>
{
    private int capacity = 0;
    private Dictionary<string, int> items = new Dictionary<string, int>();

    public Inventory(int capacity)
    {
        this.capacity = capacity;
    }

    public IReadOnlyDictionary<string, int> Items => items;

    public int Capacity => capacity;

    public int Load => items.Sum(kvp => kvp.Value);

    public int Free => Capacity < 0 ? int.MaxValue : Capacity - Load;

    public override string ToString()
    {
        string text = string.Join(Environment.NewLine, items);
        text += Environment.NewLine + Environment.NewLine + $"Занято {Load}";
        if (Capacity >= 0)
            text += $", свободно {Capacity - Load}";

        return text;
    }

    public int Add(string key, int value, bool allowPartialAdd = false)
    {
        if (!allowPartialAdd && (Capacity >= 0) && (Capacity < Load + value))
            return 0;

        value = Math.Min(value, Free);

        if (items.ContainsKey(key))
            items[key] += value;
        else
            items[key] = value;

        return value;
    }

    public void LoadData(InventoryData data)
    {
        items = data.items;
        capacity = data.capacity;
    }

    public void SaveData(InventoryData data)
    {
        data.items = new SerializableDictionary<string, int>(items);
        data.capacity = capacity;
    }
}