using System;
using System.Windows;
using System.Windows.Controls;

namespace SJ.Controls
{
    /// <summary>
    /// PageControl.xaml 的交互逻辑
    /// </summary>
    public partial class PageControl : UserControl
    {
        public PageControl()
        {
            InitializeComponent();
            this.Loaded += PageControl_Loaded;
        }

        private void PageControl_Loaded(object sender, RoutedEventArgs e)
        {
            this.PageIndex = 1;
            pageArgs.PageIndex = this.PageIndex;
        }

        /// <summary>
        /// 分页事件
        /// </summary>
        public event RoutedEventHandler OnPageIndexChanged;

        /// <summary>
        /// 分页参数
        /// </summary>
        private PageArgs pageArgs = new PageArgs();

        public static readonly DependencyProperty PageIndexProperty = DependencyProperty.Register("PageIndex", typeof(int), typeof(PageControl), new PropertyMetadata(1, new PropertyChangedCallback((s, e) =>
        {
            var pageControl = s as PageControl;
            pageControl?.OnIndexChanged();
        })));

        /// <summary>
        /// 当前页数
        /// </summary>
        public int PageIndex
        {
            get { return (int)GetValue(PageIndexProperty); }
            set { SetValue(PageIndexProperty, value); }
        }

        public static readonly DependencyProperty PageSizeProperty = DependencyProperty.Register("PageSize", typeof(int), typeof(PageControl), new PropertyMetadata(1));

        /// <summary>
        /// 每页记录数
        /// </summary>
        public int PageSize
        {
            get { return (int)GetValue(PageSizeProperty); }
            set { SetValue(PageSizeProperty, value); }
        }

        public static readonly DependencyProperty PageCountProperty = DependencyProperty.Register("PageCount", typeof(int), typeof(PageControl), new PropertyMetadata(1));

        /// <summary>
        /// 总页数
        /// </summary>
        public int PageCount
        {
            get { return (int)GetValue(PageCountProperty); }
            set { SetValue(PageCountProperty, value); }
        }

        public static readonly DependencyProperty RecordCountProperty = DependencyProperty.Register("RecordCount", typeof(int), typeof(PageControl), new PropertyMetadata(0, new PropertyChangedCallback((s, e) =>
        {
            var pageControl = s as PageControl;
            pageControl?.OnRecordChanged();
        })));

        /// <summary>
        /// 总记录数
        /// </summary>
        public int RecordCount
        {
            get { return (int)GetValue(RecordCountProperty); }
            set { SetValue(RecordCountProperty, value); }
        }

        private void OnRecordChanged()
        {
            PageCount = (RecordCount - 1) / PageSize + 1;
        }

        private void OnIndexChanged()
        {
            pageArgs.PageIndex = this.PageIndex;
            OnPageIndexChanged?.Invoke(this, pageArgs);
        }

        private void Btn_Click(object sender, RoutedEventArgs e)
        {
            var btn = sender as BButton;
            var newPageIndex = Convert.ToInt32(btn.Content);
            if (newPageIndex != PageIndex)
                PageIndex = newPageIndex;
            else
                OnIndexChanged();
        }

        private void btn_first_Click(object sender, RoutedEventArgs e)
        {
            if (PageIndex > 1)
                PageIndex = 1;
        }

        private void btn_up_Click(object sender, RoutedEventArgs e)
        {
            if (PageIndex > 1)
                PageIndex--;
        }

        private void btn_next_Click(object sender, RoutedEventArgs e)
        {
            if (PageIndex < PageCount)
                PageIndex++;
        }

        private void btn_last_Click(object sender, RoutedEventArgs e)
        {
            if (PageIndex < PageCount)
                PageIndex = PageCount;
        }
    }

    public class PageArgs : RoutedEventArgs
    {
        public int PageIndex;
        //其余自行扩展
    }
}