using ivf_tl_Operate.Converts;
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace ivf_tl_Operate.CustomUserControls
{
    /// <summary>
    /// CustomControlPagination.xaml 的交互逻辑
    /// </summary>
    public partial class CustomControlPagination : UserControl
    {
        public event Action<int> PageChangedEvent;
        public CustomControlPagination()
        {
            InitializeComponent();
        }

        /// <summary>
        /// 总页数
        /// </summary>
        private int countPage = 0;

        public int DefeatPage
        {
            get { return (int)GetValue(DefeatPageProperty); }
            set { SetValue(DefeatPageProperty, value); }
        }

        // Using a DependencyProperty as the backing store for DefeatPage.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty DefeatPageProperty =
            DependencyProperty.Register("DefeatPage", typeof(int), typeof(CustomControlPagination), new PropertyMetadata(1));

        /// <summary>
        /// 总条目数量
        /// </summary>
        public int CountNum
        {
            get { return (int)GetValue(CountNumProperty); }
            set { SetValue(CountNumProperty, value); }
        }

        // Using a DependencyProperty as the backing store for CountNum.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty CountNumProperty =
            DependencyProperty.Register("CountNum", typeof(int), typeof(CustomControlPagination), new PropertyMetadata(-1, new PropertyChangedCallback(CountNumPropertyChangedCallback)));

        /// <summary>
        /// 每一页数量
        /// </summary>
        public int PageNum
        {
            get { return (int)GetValue(PageNumProperty); }
            set { SetValue(PageNumProperty, value); }
        }

        // Using a DependencyProperty as the backing store for PageNum.  This enables animation, styling, binding, etc...
        public static readonly DependencyProperty PageNumProperty =
            DependencyProperty.Register("PageNum", typeof(int), typeof(CustomControlPagination), new PropertyMetadata(0, new PropertyChangedCallback(PageNumPropertyChangedCallback)));

        private static void PageNumPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (!(d is CustomControlPagination source)) return;
            int currentPageNum = (int)e.NewValue;

            source.WindowInit(currentPageNum, source.CountNum);
        }

        private static void CountNumPropertyChangedCallback(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            if (!(d is CustomControlPagination source)) return;
            int max = (int)e.NewValue;
            source.WindowInit(source.PageNum, max);
        }

        private void WindowInit(int pageSize, int dataCount)
        {
            if (pageSize == -1 || dataCount == -1) return;
            if (dataCount == 0 || pageSize == 0)
            {
                PageChangedEvent?.Invoke(1);
                this.grid.Visibility = Visibility.Collapsed;
                return;
            }

            int countPage = dataCount / pageSize;
            if (dataCount % pageSize != 0)
            {
                countPage++;
            }
            ObservableCollection<int> _items = new ObservableCollection<int>();
            for (int i = 1; i <= countPage; i++)
            {
                _items.Add(i);
            }
            this.pageListBox.SelectedIndex = -1;
            this.pageListBox.ItemsSource = _items;

            this.countPage = countPage;
            if (countPage <= 1)
            {
                if (countPage == 1)
                {
                    this.pageListBox.SelectedIndex = 0;
                }
                this.grid.Visibility = Visibility.Collapsed;
            }
            else
            {
                var k = DefeatPage;
                if (k > countPage) k = countPage;
                if (k < 1) k = 1;
                this.pageListBox.SelectedIndex = k - 1;

                //this.pageListBox.SelectedIndex = 0;
                this.grid.Visibility = Visibility.Visible;
                //this.countPageText.Text = $"共{countPage}页";
                this.countPageText.Text = $"{KeyToStringConvert.GetLanguageStringByKey("C0275")} {countPage} {KeyToStringConvert.GetLanguageStringByKey("C0276")}";
            }
        }

        private void ListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (!(sender is ListBox listBox))
            {
                return;
            }
            if (listBox.SelectedIndex == -1)
            {
                return;
            }
            if (listBox.SelectedIndex == 0 || listBox.SelectedIndex == (pageListBox.Items.Count - 1))
            {
                listBox.ScrollIntoView(listBox.Items[listBox.SelectedIndex]);
            }
            else
            {
                var scr = listBox.Template.FindName("scroll", listBox) as ScrollViewer;
                if (scr != null)
                {
                    var k = listBox.SelectedIndex - 1;
                    if (k < 0)
                    {
                        k = 0;
                    }
                    var aa = scr.HorizontalOffset;
                    scr.ScrollToHorizontalOffset(k);
                }
                else
                {
                    listBox.ScrollIntoView(listBox.Items[listBox.SelectedIndex]);
                }
            }
            PageChangedEvent?.Invoke((listBox.SelectedIndex + 1));
        }

        private void FirstPage_Click(object sender, RoutedEventArgs e)
        {
            pageListBox.SelectedIndex = 0;
        }

        private void PreviousPage_Click(object sender, RoutedEventArgs e)
        {
            var newIndex = (int)pageListBox.SelectedIndex - 1;
            if (newIndex >= 0)
            {
                pageListBox.SelectedIndex = newIndex;
            }
        }
        private void NextPage_Click(object sender, RoutedEventArgs e)
        {
            var newIndex = (int)pageListBox.SelectedIndex + 1;
            if (newIndex <= (pageListBox.Items.Count - 1))
            {
                pageListBox.SelectedIndex = newIndex;
            }
        }
        private void LastPage_Click(object sender, RoutedEventArgs e)
        {
            pageListBox.SelectedIndex = pageListBox.Items.Count - 1;
        }

        private void JumpPage_Click(object sender, RoutedEventArgs e)
        {
            string newPageString = this.jumpPage_TextBox.Text.Trim();
            if (string.IsNullOrEmpty(newPageString)) return;
            if (int.TryParse(newPageString, out int newPageInt))
            {
                if (newPageInt >= 1 && newPageInt <= pageListBox.Items.Count)
                {
                    pageListBox.SelectedIndex = (newPageInt - 1);
                }
            }
        }
    }
}