using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Text;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using DevExpress.XtraGrid;
using DevExpress.XtraPrinting;
using System.Collections;
using System.Threading;
using UI.Framework.Forms;

namespace UI.Framework.Controls
{
    public partial class PageControl : DevExpress.XtraEditors.XtraUserControl
    {
        public class SerchResult
        {
            /// <summary>
            /// 总行数
            /// </summary>
            public long Total { get; set; }

            /// <summary>
            /// 查询结果
            /// </summary>
            public object Result { get; set; }
        }

        public PageControl()
        {
            InitializeComponent();
        }

        public delegate SerchResult SerchEvents(int curPage, int pageSize);
        private SerchEvents method;
        private GridControl gridControl;
        private bool beginQuery;
        public void Bind(SerchEvents method, GridControl gridControl, int pageSize, bool goto_first = true, bool beginQuery = false)
        {
            try
            {
                this.beginQuery = beginQuery;
                this.textEditToPageSize.Text = pageSize.ToString();
                this.method = method;
                this.gridControl = gridControl;
                this.textEditToPageSize.Text = PageSize.ToString();
                if (goto_first) GotoPage(1);
            }
            catch (Exception ex)
            {
                BaseForm.ShowError(ex.Message + "._", "系统错误");
            }
        }

        /// <summary>
        /// 每页行
        /// </summary>
        public int PageSize
        {
            get
            {
                return int.Parse(textEditToPageSize.Text);
            }
        }

        /// <summary>
        /// 总页数
        /// </summary>

        public int PageMax
        {
            get
            {
                return int.Parse(this.textEditToPageMax.Text);
            }
        }

        /// <summary>
        /// 当前页
        /// </summary>
        public int PageCur
        {
            get { return int.Parse(this.textEditCurPage.Text); }
        }

        /// <summary>
        /// 代理委托更新UI
        /// </summary>
        /// <param name="act"></param>
        protected delegate void DelegateUpdateUI(Action act);

        /// <summary>
        /// 代理委托更新UI
        /// </summary>
        /// <param name="act"></param>
        protected void UpdateUI(Action act)
        {
            try
            {
                if (!InvokeRequired)
                {
                    act.Invoke();
                }
                else
                {
                    DelegateUpdateUI delegateUpdateUI = new DelegateUpdateUI(UpdateUI);
                    Invoke(delegateUpdateUI, act);
                }
            }
            catch (Exception)
            { }
        }

        /// <summary>
        /// 查询第几页
        /// </summary>
        /// <param name="toPage"></param>
        public void GotoPage(int toPage = 1)
        {
            try
            {
                if (toPage <= 0) toPage = 1;
                if (method == null) throw new Exception("请先调用Bind函数,绑定委托!");

                SerchResult result = null;
                this.UpdateUI(() =>
                {
                    this.gridControl.DataSource = null;
                });

                result = this.method(toPage, PageSize);

                if (result == null) result = new SerchResult() { Result = new ArrayList(), Total = 0 };

                //分页计算
                var rows = result.Total / PageSize;
                if (rows != 0 && result.Total % PageSize != 0) rows++;

                this.UpdateUI(() =>
                {
                    this.gridControl.DataSource = result.Result;
                    //控件绑定
                    this.textEditCurPage.Text = toPage.ToString();
                    this.comboBoxEditTotal.Text = result.Total.ToString();
                    this.textEditToPageMax.Text = rows.ToString();

                    //控制显示
                    simpleButtonPre.Enabled = false;
                    simpleButtonFirst.Enabled = false;
                    simpleButtonNext.Enabled = false;
                    simpleButtonEnd.Enabled = false;
                    if (result.Total > 0)
                    {
                        if (toPage > 1)
                        {
                            simpleButtonPre.Enabled = true;
                            simpleButtonFirst.Enabled = true;
                        }
                        if (toPage < rows)
                        {
                            simpleButtonNext.Enabled = true;
                            simpleButtonEnd.Enabled = true;
                        }
                    }
                });
            }
            catch (Exception ex)
            {
                this.UpdateUI(() =>
                {
                    BaseForm.ShowError(ex.Message);
                });
            }
        }

        #region 分页按钮被单击
        private async void simpleButtonFirst_Click(object sender, EventArgs e)
        {
            if (beginQuery) await Task.Run(() => { GotoPage(1); });
            else GotoPage(1);
        }

        private async void simpleButtonPre_Click(object sender, EventArgs e)
        {
            if (beginQuery) await Task.Run(() => { GotoPage((PageCur - 1)); });
            else GotoPage((PageCur - 1));
        }

        private async void simpleButtonNext_Click(object sender, EventArgs e)
        {
            if (beginQuery) await Task.Run(() => { GotoPage(PageCur + 1); });
            else GotoPage(PageCur + 1);
        }

        private async void simpleButtonEnd_Click(object sender, EventArgs e)
        {
            if (beginQuery) await Task.Run(() => { GotoPage(PageMax); });
            else GotoPage(PageMax);
        }

        public async void Go(object sender, EventArgs e)
        {
            var btn = sender as SimpleButton;
            if (btn != null) btn.Enabled = false;
            if (beginQuery)
                await Task.Run(() => { GotoPage(int.Parse(textEdit1.Text)); });
            else GotoPage(int.Parse(textEdit1.Text));
            if (btn != null) btn.Enabled = true;
        }
        #endregion

        //导出Excel
        private void barButtonItem1_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            try
            {
                if (this.gridControl == null) throw new Exception("没有需要导出的数据!");
                if (XtraMessageBox.Show("确定要将本页面数据导入到Excel内?", "请选择", MessageBoxButtons.OKCancel, MessageBoxIcon.Question) == DialogResult.OK)
                {
                    var table = this.gridControl.DataSource as DataTable;
                    //if (table == null || table.Rows.Count == 0) throw new Exception("没有需要导出的数据!");

                    this.SaveFileDialog.Filter = "Excel文件(*.xls)|*.xls";
                    if (this.SaveFileDialog.ShowDialog(this) == DialogResult.OK)
                    {
                        DevExpress.XtraPrinting.XlsExportOptions options = new DevExpress.XtraPrinting.XlsExportOptions();
                        this.gridControl.ExportToXls(this.SaveFileDialog.FileName);
                        XtraMessageBox.Show("恭喜您,已完成数据导出!", "导出完成", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    }
                }
            }
            catch (Exception vErr)
            {
                XtraMessageBox.Show(vErr.Message, "导出错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

        //打印数据
        private void barButtonItem3_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            try
            {
                PrintingSystem print = new DevExpress.XtraPrinting.PrintingSystem();
                PrintableComponentLink link = new PrintableComponentLink(print);
                print.Links.Add(link);
                link.Component = this.gridControl;//这里可以是可打印的部件
                PageHeaderFooter phf = link.PageHeaderFooter as PageHeaderFooter;
                phf.Header.Content.Clear();
                phf.Header.Content.AddRange(new string[] { "", "", "" });
                phf.Header.Font = new System.Drawing.Font("宋体", 14, System.Drawing.FontStyle.Bold);
                phf.Header.LineAlignment = BrickAlignment.Center;
                link.CreateDocument(); //建立文档
                print.PreviewFormEx.Show();//进行预览

            }
            catch (Exception ex)
            {
                XtraMessageBox.Show(ex.Message, "打印错误", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }

    }
}