using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using DevComponents.DotNetBar;
using DevComponents.DotNetBar.Metro;
using POSV;
using POSV.Entity;

namespace POSV.Component
{
    [ToolboxItem(true)]
    public partial class CategoryX : BaseUserControl
    {

        /// <summary>
        /// 商品分类控件元素默认宽度
        /// </summary>
        public const int CATEGORY_DEFAULT_WIDTH = 100;

        private List<ProductType> _dataSource;
                
        public CategoryX()
        {
            InitializeComponent();

            this.itemPanel.ResizeItemsToFit = false;
            this.itemPanel.BackgroundStyle.Class = "MetroTileGroupTitle";//很关键
        }

        protected override void OnLoad(EventArgs e)
        {
            base.OnLoad(e);

            if (this.DesignMode) return;
        }

        protected override void OnResize(EventArgs e)
        {
            base.OnResize(e);

            //计算能显示的列数
            this.ItemWidth = CATEGORY_DEFAULT_WIDTH;
            if (this.ItemWidth + this.ItemSpace != 0)
            {
                this.Columns = (this.itemPanel.Width / (this.ItemWidth + this.ItemSpace));
            }
            if (this.Columns != 0)
            {
                this.ItemWidth = Convert.ToInt16((this.itemPanel.Width * 1.0 / (this.Columns * 1.0)) - this.ItemSpace);

                BindDataSource(this._dataSource);
            }
        }

        public event CategoryXEventHandler CategoryXCheckedChanged;
        protected virtual void OnCategoryXCheckedChanged(CategoryXEventArgs e)
        {
            CategoryXCheckedChanged?.Invoke(this, e);
        }

        public void BindDataSource(List<ProductType> dataSource)
        {
            try
            {
                this._dataSource = dataSource;

                if (dataSource == null)
                {
                    this._dataSource = new List<ProductType>();
                }

                this.TotalCount = this._dataSource.Count;
                this.PageSize = this.Columns * this.Rows;
                //清空历史数据
                this.itemPanel.Items.Clear();

                var pager = ListPager(this._dataSource);

                ItemContainer mainContainer = new ItemContainer();
                mainContainer.Name = "categoryContainer";
                mainContainer.MultiLine = (this.Rows > 1);
                mainContainer.ItemSpacing = this.ItemSpace;
                mainContainer.LayoutOrientation = eOrientation.Horizontal;
                mainContainer.BackgroundStyle.Padding = 0;
                mainContainer.BackgroundStyle.PaddingLeft = 0;
                mainContainer.BackgroundStyle.PaddingRight = 0;

                foreach (ProductType entity in pager)
                {
                    MetroTileItem item = new MetroTileItem();
                    item.TileStyle.PaddingLeft = item.TileStyle.PaddingRight = -2;
                    item.EnableMarkup = true;
                    item.OptionGroup = "category";
                    item.TileStyle.BorderWidth = 1;
                    item.TileStyle.CornerDiameter = 18;
                    item.TileStyle.CornerType = eCornerType.Rounded;
                    item.TileStyle.BackColor = ColorTranslator.FromHtml("#E7EAF1");// Color.White;
                    item.TileStyle.BackColor2 = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    item.TileStyle.BorderColor = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    item.TileStyle.BorderColor2 = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    item.TitleTextAlignment = ContentAlignment.MiddleCenter;
                    item.Checked = false;
                    item.CheckBehavior = eMetroTileCheckBehavior.None;

                    //显示大小
                    item.TileSize = new Size(this.ItemWidth, this.ItemHeight);
                    item.TileStyle.TextAlignment = DevComponents.DotNetBar.eStyleTextAlignment.Center;
                    item.TileStyle.TextLineAlignment = DevComponents.DotNetBar.eStyleTextAlignment.Center;

                    item.TileStyle.TextColor = ColorTranslator.FromHtml("#444444");

                    //绑定品类名称到Text属性
                    item.Text = entity.Name;

                    //绑定品类ID到Tag属性
                    item.Tag = entity;

                    item.MouseDown -= OnCategoryMouseDown;
                    item.MouseDown += OnCategoryMouseDown;

                    mainContainer.SubItems.Add(item);
                }

                this.itemPanel.Items.Insert(0, mainContainer);

                this.itemPanel.Invalidate();
            }
            catch(Exception ex)
            {
                LOGGER.Error(ex, "构建商品分类控件内容异常");
            }
        }

        private void OnCategoryMouseDown(object sender, MouseEventArgs e)
        {
            var metro = sender as MetroTileItem;

            metro.Checked = false;
            if (metro.Tag == null) return;

            foreach (BaseItem item in metro.Parent.SubItems)
            {
                if (item == metro) continue;

                var b = item as MetroTileItem;
                if (b != null && b.OptionGroup == metro.OptionGroup)
                {
                    //正常情况下的背景颜色
                    b.TileStyle.BackColor = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    b.TileStyle.BackColor2 = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    b.TileStyle.BorderColor = ColorTranslator.FromHtml("#E7EAF1");//Color.White;
                    b.TileStyle.BorderColor2 = ColorTranslator.FromHtml("#E7EAF1");//Color.White;

                    b.TileStyle.TextColor = ColorTranslator.FromHtml("#444444");
                }
            }

            //选中情况下的背景颜色
            metro.TileStyle.BackColor = ColorTranslator.FromHtml("#00C7BA");
            metro.TileStyle.BackColor2 = ColorTranslator.FromHtml("#00C7BA");
            metro.TileStyle.BorderColor = ColorTranslator.FromHtml("#00C7BA");
            metro.TileStyle.BorderColor2 = ColorTranslator.FromHtml("#00C7BA");
            metro.TileStyle.TextColor = ColorTranslator.FromHtml("#FFFFFF");

            OnCategoryXCheckedChanged(new CategoryXEventArgs((ProductType)metro.Tag));
        }

        /// <summary>
        /// 分页List数据
        /// </summary>
        /// <param name="data"></param>
        /// <returns></returns>
        public List<T> ListPager<T>(List<T> data)
        {
            var result = new List<T>();

            result.AddRange(data.Skip((this.PageNumber - 1) * this.PageSize).Take(this.PageSize));

            return result;
        }

        private MetroTileItem _selectedItem = null;

        public MetroTileItem SelectedItem
        {
            get { return this._selectedItem; }
            private set { this._selectedItem = value; }
        }


        /// <summary>
        /// 每页数量
        /// </summary>
        public int PageSize { get; private set; }

        /// <summary>
        /// 总页数
        /// </summary>
        public int PageCount => this.PageSize <= 0 ? 0 : ((TotalCount + this.PageSize - 1) / this.PageSize);

        /// <summary>
        /// 当前页码
        /// </summary>
        public int PageNumber { get; set; } = 1;

        /// <summary>
        /// 总数量
        /// </summary>
        public int TotalCount { get; private set; }

        private int _columns = 1;
        /// <summary>
        /// 显示的列数
        /// </summary>
        public int Columns
        {
            get
            {
                return _columns;
            }
            set
            {
                _columns = (value < 0 ? 1 : value);
            }
        }

        private int _rows = 1;
        /// <summary>
        /// 显示行数
        /// </summary>
        public int Rows
        {
            get
            {
                return _rows;
            }
            set
            {
                _rows = (value <= 0 ? 1 : value);
            }
        }

        private int _itemHeight = 38;

        public int ItemHeight
        {
            get
            {
                return _itemHeight;
            }
            set
            {
                _itemHeight = value;
            }
        }

        private int _itemWidth = CATEGORY_DEFAULT_WIDTH;

        public int ItemWidth
        {
            get
            {
                return _itemWidth;
            }
            set
            {
                this._itemWidth = value;
            }
        }

        private int _itemSpace = 2;
        /// <summary>
        /// 控件间距
        /// </summary>
        public int ItemSpace
        {
            get
            {
                return _itemSpace;
            }
            set
            {
                this._itemSpace = value;
            }
        }

        private void OnPrePageClick(object sender, EventArgs e)
        {
            if (this.HasPreviousPage)
            {
                this.PageNumber--;

                BindDataSource(this._dataSource);
            }
        }

        private void OnNextPageClick(object sender, EventArgs e)
        {
            if (this.HasNextPage)
            {
                this.PageNumber++;

                BindDataSource(this._dataSource);
            }
        }

        //是否有上一页
        public bool HasPreviousPage
        {
            get { return PageNumber > 1; }
        }

        //是否有下一页
        public bool HasNextPage
        {
            get { return PageNumber < this.PageCount; }
        }
    }

    public delegate void CategoryXEventHandler(object sender, CategoryXEventArgs e);

    public class CategoryXEventArgs : EventArgs
    {
        public ProductType Data;
        public CategoryXEventArgs(ProductType data)
        {
            this.Data = data;
        }
    }
}