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 POSV.Entity;
using System.Diagnostics;
using POSV.Utils;
using DevComponents.DotNetBar.Metro;
using DevComponents.DotNetBar;

namespace POSV.Component
{
    [ToolboxItem(true)]
    public partial class ProductXControl : BaseUserControl
    {
        /// <summary>
        /// 商品控件默认宽度
        /// </summary>
        public const int PRODUCT_DEFAULT_WIDTH = 104;

        /// <summary>
        /// 商品控件默认高度
        /// </summary>
        public const int PRODUCT_DEFAULT_HEIGHT = 76;

        /// <summary>
        /// 数据源
        /// </summary>
        private List<ProductExt> _dataSource = null;

        /// <summary>
        /// 显示价格类型
        /// </summary>
        private PriceTypeEnum _priceType = PriceTypeEnum.零售价;

        //这样可以加快多次创建item速度，否则每次要耗时2毫秒
        private Image _defaultImage = global::POSV.Properties.Resources.圆角矩形_2x;

        public ProductXControl()
        {
            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;

            ReCalSize();

            this.Resize += OnResize;
        }

        private void OnResize(object sender, EventArgs e)
        {
            switch (this.FindForm().WindowState)
            {
                case FormWindowState.Normal:
                case FormWindowState.Maximized:
                    {
                        ReCalSize();
                    }
                    break;
            }

        }

        private void ReCalSize()
        {
            //计算能显示的列数
            var _width = this.ItemWidth + this.ItemSpace - 1;
            if (_width != 0)
            {
                this.Columns = ((this.Width - this.Padding.Left - this.Padding.Right) / _width);
            }

            //根据行数，重新规划高度
            var _height = this.ItemHeight + this.ItemSpace - 1;
            if (_height != 0)
            {
                this.Rows = ((this.Height - this.Padding.Top - this.Padding.Bottom) / _height);
            }
            this.ItemHeight = (this.Height - this.Padding.Top - this.Padding.Bottom) / this.Rows - this.ItemSpace;

            BindDataSource(this._dataSource, this._priceType);
        }

        public void BindDataSource(List<ProductExt> dataSource, PriceTypeEnum priceType)
        {
            try
            {
                if (dataSource == null)
                {
                    this._dataSource = new List<ProductExt>();
                }

                //加入分页，避免污染源数据，新建集合
                List<ProductExt> list = new List<ProductExt>();
                list.AddRange(dataSource);
                this._dataSource = list;

                this._priceType = priceType;

                //可以考虑更优化的分摊机制？张莹
                int deltaX = this.Width - this.Padding.Left - this.Padding.Right - (this.ItemWidth + this.ItemSpace) * this.Columns - this.ItemSpace;
                int deltaY = this.Height - this.Padding.Top - this.Padding.Bottom - (this.ItemHeight + this.ItemSpace) * this.Rows - this.ItemSpace;

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

                //复制新的数据源，进行分页运算
                var merge = ProductXMerge.Merge(this.Rows, this.Columns, this._dataSource, false);
                var pager = ListPager(merge);

                ItemContainer mainContainer = new ItemContainer();
                mainContainer.Name = "productContainer";
                mainContainer.MultiLine = (this.Rows > 1);
                mainContainer.ItemSpacing = this.ItemSpace;
                mainContainer.LayoutOrientation = eOrientation.Horizontal;

                for (int i=0;i < pager.Count;i++)
                {
                    ProductExt entity = pager[i];

                    MetroTileItem item = new MetroTileItem();
                    item.TileStyle.PaddingLeft = item.TileStyle.PaddingRight = 0;
                    item.EnableMarkup = true;
                    item.OptionGroup = "product";
                    item.TileStyle.BorderWidth = 0;
                    item.TileStyle.BackColor = Color.Transparent;
                    item.TileStyle.BackColor2 = Color.Transparent;
                    item.TileStyle.BorderColor = Color.Transparent;
                    item.TileStyle.BorderColor2 = Color.Transparent;

                    //判断商品背景
                    item.TileStyle.BackgroundImage = _defaultImage;

                    item.TileStyle.BackgroundImagePosition = eStyleBackgroundImage.Stretch;
                    item.TitleTextAlignment = ContentAlignment.MiddleCenter;
                    item.Checked = false;
                    //将宽度进行补偿
                    int _width = this.ItemWidth + (this.Columns > 0 ? (deltaX / this.Columns) : 0);

                    int _offsetWidth = this.Columns > 0 ? (deltaX % this.Columns) : 0;

                    //if (i % _offsetWidth == 0)
                    //{
                    //    _width += _offset;
                    //}

                    //将高度误差补入第一行
                    int _height = this.ItemHeight + deltaY;
                    //if (this.Columns - mainContainer.SubItems.Count > 0)
                    //{
                    //    _height += deltaY;
                    //}

                    //显示大小
                    item.TileSize = new Size(_width, _height);


                    //显示编码后，调整呈现位置
                    item.TileStyle.TextAlignment = DevComponents.DotNetBar.eStyleTextAlignment.Center;
                    item.TileStyle.TextLineAlignment = DevComponents.DotNetBar.eStyleTextAlignment.Near;
                    item.TitleTextAlignment = System.Drawing.ContentAlignment.BottomRight;
                    var price = decimal.Zero;
                    switch (this._priceType)
                    {
                        case PriceTypeEnum.零售价:
                            {
                                price = entity.Price;
                            }
                            break;
                        case PriceTypeEnum.最低售价:
                            {
                                price = entity.MinPrice;
                            }
                            break;
                        case PriceTypeEnum.外送价:
                            {
                                price = entity.OtherPrice;
                            }
                            break;
                        case PriceTypeEnum.会员价:
                            {
                                price = entity.MemberPrice;
                            }
                            break;
                    }
                    //品名
                    item.TileStyle.TextColor = ColorTranslator.FromHtml("#444444");
                    //售价
                    item.TitleTextColor = ColorTranslator.FromHtml("#F45B63");

                    //绑定商品Tag属性
                    item.Tag = ObjectUtils.Copy(entity);
                    switch (entity.Name)
                    {
                        case Constant.PREV_PAGER:
                            {
                                item.TileStyle.BackgroundImage = _defaultImage;
                                item.Image = global::POSV.Properties.Resources.上一页_2x;
                                item.ImageTextAlignment = ContentAlignment.MiddleCenter;
                                item.Text = string.Empty;
                            }
                            break;
                        case Constant.NEXT_PAGER:
                            {
                                item.TileStyle.BackgroundImage = _defaultImage;
                                item.Image = global::POSV.Properties.Resources.下一页_2x;
                                item.ImageTextAlignment = ContentAlignment.MiddleCenter;
                                item.Text = string.Empty;
                            }
                            break;
                        default:
                            {
                                //显示编码后，调整呈现位置
                                item.TitleText = string.Format("¥{0}", price.ToString());

                                //绑定商品名称到Text属性
                                item.Text = entity.Name;
                            }
                            break;
                    }

                    item.MouseDown -= OnProductMouseDown;
                    item.MouseDown += OnProductMouseDown;

                    mainContainer.SubItems.Add(item);
                }

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

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

        private void OnProductMouseDown(object sender, MouseEventArgs e)
        {
            if (e.Button == MouseButtons.Left)
            {
                MetroTileItem item = (MetroTileItem)sender;

                var product = item.Tag as ProductExt;

                switch (product.Name)
                {
                    case Constant.PREV_PAGER:
                        {
                            this.PageNumber = product.Pager;
                            this.BindDataSource(this._dataSource, this._priceType);
                        }
                        break;
                    case Constant.NEXT_PAGER:
                        {
                            this.PageNumber = product.Pager;
                            this.BindDataSource(this._dataSource, this._priceType);
                        }
                        break;
                    default:
                        {
                            OnProductXClick(new ProductXEventArgs((ProductExt)item.Tag));
                        }
                        break;
                }

            }
        }

        public event ProductXEventHandler ProductXClick;
        protected virtual void OnProductXClick(ProductXEventArgs e)
        {
            ProductXClick?.Invoke(this, e);
        }

        /// <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; }

        /// <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);
            }
        }

        public int ItemHeight { get; set; } = PRODUCT_DEFAULT_HEIGHT;

        public int ItemWidth { get; set; } = PRODUCT_DEFAULT_WIDTH;

        /// <summary>
        /// 控件间距
        /// </summary>
        public int ItemSpace { get; set; } = 2;
    }

    /// <summary>
    /// 价格类型
    /// </summary>
    public enum PriceTypeEnum
    {
        零售价,
        会员价,
        进价,
        最低售价,
        配送价,
        批发价,
        外送价
    }


    public delegate void ProductXEventHandler(object sender, ProductXEventArgs e);

    public class ProductXEventArgs : EventArgs
    {
        public ProductExt Product;
        public ProductXEventArgs(ProductExt data)
        {
            this.Product = data;
        }
    }

    public class ProductXMerge
    {
        private static NLog.Logger logger = NLog.LogManager.GetCurrentClassLogger();

        public static List<ProductExt> Merge(int rows, int cols, List<ProductExt> dataSource, bool touchEnabled)
        {
            Stopwatch sw = Stopwatch.StartNew();

            //启用触摸屏，不分页
            if (touchEnabled)
            {
                return dataSource;
            }

            //移除可能存在的分页标识
            dataSource.RemoveAll(x => Constant.PREV_PAGER.Equals(x.Name) || Constant.NEXT_PAGER.Equals(x.Name));

            int pageSize = rows * cols;

            int totalCount = dataSource.Count;

            //启用分页
            int pageCount = ((totalCount - 1) + (pageSize - 2) - 1) / (pageSize - 2);

            if (pageCount > 1)
            {
                int offset = 0;
                for (int page = 1; page <= pageCount; page++)
                {
                    if (page == 1)
                    {
                        offset = page * pageSize - 1;

                        var entity = new ProductExt();
                        entity.Id = IdWorkerUtils.Instance.NextId();
                        entity.Name = Constant.NEXT_PAGER;
                        entity.Pager = (page + 1);

                        dataSource.Insert(offset, entity);
                    }
                    else if (page < pageCount)
                    {
                        offset = page * pageSize - 2;

                        var entity = new ProductExt();
                        entity.Id = IdWorkerUtils.Instance.NextId();
                        entity.Name = Constant.PREV_PAGER;
                        entity.Pager = (page - 1);

                        dataSource.Insert(offset, entity);

                        offset++;

                        entity = new ProductExt();
                        entity.Id = IdWorkerUtils.Instance.NextId();
                        entity.Name = Constant.NEXT_PAGER;
                        entity.Pager = (page + 1);

                        dataSource.Insert(offset, entity);
                    }
                    else
                    {
                        var entity = new ProductExt();
                        entity.Id = IdWorkerUtils.Instance.NextId();
                        entity.Name = Constant.PREV_PAGER;
                        entity.Pager = (page - 1);

                        dataSource.Add(entity);
                    }
                }
            }

            logger.Info("商品控件插入分页控件，耗时<{0}>", sw.ElapsedMilliseconds);
            return dataSource;
        }
    }
}