using System;
using System.Collections.Generic;
using ColdMint.scripts.map.events;

namespace ColdMint.scripts.inventory;

/// <summary>
/// <para>item container</para>
/// <para>物品容器</para>
/// </summary>
/// <remarks>
///<para>Item containers can store items. Things like backpacks and Hotbars are containers with visual pages.</para>
///<para>物品容器可以储存物品。像背包和hotbar是具有可视化页面的容器。</para>
/// </remarks>
public interface IItemContainer : IEnumerable<IItem>
{
    /// <summary>
    /// <para>This event is triggered when the selected item changes</para>
    /// <para>当选中的物品改变时，触发此事件</para>
    /// </summary>
    Action<SelectedItemChangeEvent>? SelectedItemChangeEvent { get; set; }

    /// <summary>
    /// <para>Can the specified item be added to the container?</para>
    /// <para>指定的物品是否可添加到容器内？</para>
    /// </summary>
    /// <param name="item"></param>
    /// <returns></returns>
    bool CanAddItem(IItem item);

    /// <summary>
    /// <para>Implement methods for adding items</para>
    /// <para>实现添加物品的方法</para>
    /// </summary>
    /// <param name="item"></param>
    /// <returns>
    ///<para>How many items were successfully added. The addition failed, and 0 was returned.</para>
    ///<para>有多少个物品被成功添加了。添加失败，返回0</para>
    /// </returns>
    int AddItem(IItem item);

    /// <summary>
    /// <para>Whether this item container supports checking</para>
    /// <para>此物品容器是否支持选中</para>
    /// </summary>
    public bool SupportSelect { get; set; }


    /// <summary>
    /// <para>Gets the selected location</para>
    /// <para>获取选中的位置</para>
    /// </summary>
    /// <returns></returns>
    int GetSelectIndex();

    /// <summary>
    /// <para>Gets the currently selected item</para>
    /// <para>获取当前选中的物品</para>
    /// </summary>
    /// <returns></returns>
    IItem? GetSelectItem();

    /// <summary>
    /// <para>Gets the item in the specified location</para>
    /// <para>获取指定位置的物品</para>
    /// </summary>
    /// <param name="index"></param>
    /// <returns></returns>
    IItem? GetItem(int index);

    /// <summary>
    /// <para>Gets the item in the specified location, equivalent to <see cref="GetItem"/></para>
    /// <para>获取指定位置的物品，等同于<see cref="GetItem"/></para>
    /// </summary>
    /// <param name="index"></param>
    /// <returns></returns>
    IItem? this[int index] => GetItem(index);


    /// <summary>
    /// <para>Removes the item from the currently selected location</para>
    /// <para>移除当前选中位置的物品</para>
    /// </summary>
    /// <param name="number">
    /// <para>Quantity to be removed, inputs below zero represent all items</para>
    /// <para>要删除的数量，小于0的输入代表全部物品</para>
    /// </param>
    /// <returns>
    ///<para>How many items were actually removed</para>
    ///<para>实际移除了多少个物品</para>
    /// </returns>
    int RemoveSelectItem(int number);

    /// <summary>
    /// <para>Deduct the number of items in the specified location</para>
    /// <para>扣除指定位置的物品数量</para>
    /// </summary>
    /// <param name="itemIndex"></param>
    /// <param name="number">
    /// <para>Quantity to be removed, inputs below zero represent all items</para>
    /// <para>要删除的数量，小于0的输入代表全部物品</para>
    /// </param>
    /// <returns>
    ///<para>How many items were actually removed</para>
    ///<para>实际移除了多少个物品</para>
    /// </returns>
    int RemoveItem(int itemIndex, int number);

    /// <summary>
    /// <para>Gets the used capacity of the item container</para>
    /// <para>获取物品容器已使用的容量</para>
    /// </summary>
    /// <returns></returns>
    int GetUsedCapacity();

    /// <summary>
    /// <para>Gets the total capacity of the item container</para>
    /// <para>获取物品容器的总容量</para>
    /// </summary>
    /// <returns></returns>
    int GetTotalCapacity();

    /// <summary>
    /// <para>Select the next item</para>
    /// <para>选择下一个物品</para>
    /// </summary>
    void SelectNextItem();

    /// <summary>
    /// <para>Select the previous item</para>
    /// <para>选择上一个物品</para>
    /// </summary>
    void SelectPreviousItem();

    /// <summary>
    /// <para>选择物品</para>
    /// <para>Select item</para>
    /// </summary>
    /// <param name="index"></param>
    void SelectItem(int index);
}