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 JwKdsV.Core;
using System.Threading;

namespace JwKdsV.Component
{
    public partial class PagerControl : UserControl
    {
        public PagerControl()
        {
            InitializeComponent();
        }

        private int _totalCount = 0;
        /// <summary>
        /// 总条数
        /// </summary>
        [Category("杂项"), Description("总条数")]
        public int TotalCount
        {
            get
            {
                return _totalCount;
            }
            set
            {
                if(_totalCount == value)
                {
                    return;
                }
                _totalCount = value;
                CalculatePageCount();
            }
        }

        private int _pageSize = 5;
        /// <summary>
        /// 每页展示数量
        /// </summary>
        [Category("杂项"), Description("每页展示数量")]
        public int PageSize
        {
            get
            {
                return _pageSize;
            }
            set
            {
                _pageSize = value;
                CalculatePageCount();
            }
        }

        /// <summary>
        /// 总页数
        /// </summary>
        [Category("杂项"), Description("总页数")]
        public int PageCount { get; set; }

        private int _currentPage;
        /// <summary>
        /// 当前页数
        /// </summary>
        [Category("杂项"), Description("当前页数")]
        public int CurrentPage
        {
            get
            {
                return _currentPage;
            }
            set
            {
                if(_currentPage == value)
                {
                    return;
                }
                _currentPage = value;
                RefreshUI();
            }
        }

        private void CalculatePageCount()
        {
            if(PageSize == 0)
            {
                //排除错误设置
                return;
            }
            if(TotalCount % PageSize == 0)
            {
                PageCount = TotalCount / PageSize;
            }
            else
            {
                PageCount = TotalCount / PageSize + 1;
            }
            //默认显示第一页
            this.CurrentPage = 1;
            RefreshUI();
        }

        /// <summary>
        /// 更新UI
        /// </summary>
        private void RefreshUI()
        {
            this.upButton.Enabled = true;
            this.downButton.Enabled = true;
            if(CurrentPage <= 1)
            {
                this.upButton.Enabled = false;
            }
            if(CurrentPage >= PageCount)
            {
                this.downButton.Enabled = false;
            }
            this.pageLabel.Text = string.Format("{0}/{1}", CurrentPage, PageCount);
        }

        private Font _font = Constant.NORMAL_FONT;
        [Category("杂项"), Description("字体")]
        public Font PanelFont
        {
            get
            {
                return this._font;
            }
            set
            {
                this._font = value;
                this.upButton.Font = this._font;
                this.pageLabel.Font = this._font;
                this.downButton.Font = this._font;
            }
        }

        private void OnPageChangeClick(object sender, EventArgs e)
        {
            if(sender is Button)
            {
                var obj = sender as Button;
                var target = obj.Tag as string;
                if(target == "up")
                {
                    //上一页
                    this.CurrentPage--;
                }
                else
                {
                    //下一页
                    this.CurrentPage++;
                }
                OnPageChange(this);
            }
        }

        public event Action<object> PageChangeWithObject;

        private void OnPageChange(PagerControl sender)
        {
            Action<object> temp = Interlocked.CompareExchange(ref PageChangeWithObject, null, null);
            if (temp != null)
            {
                temp(sender);
            }
        }
    }
}