using System;
using System.Collections.Generic;
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 PDF_Office.CustomControl.CompositeControl
{
    //用法：
    // IsValueContent为ture时，使用ValueStr作为集合某项的值
    //IsValueContent为false时，使用Value作为集合某项的值
    //SetItemSource(List<ComboDataItem> items)更换集合List
    //默认：字体集合、IsValueContent为false、Value作为集合某项的值


    public class ComboDataItem
    {
        public string ValueStr { get; private set; }
        public double Value { get; private set; }
        public string Content { get; private set; }
        public string Unit { get; private set; }
        public ComboDataItem(double value, string unitStr = "")
        {
            Content = value + unitStr;
            Value = value;
        }
        public ComboDataItem(string valueStr, string contentStr = "")
        {
            Content = contentStr;
            ValueStr = valueStr;
        }

    }
    /// <summary>
    /// CustomComboControl.xaml 的交互逻辑
    /// </summary>
    public partial class CustomComboControl : UserControl
    {
        public List<ComboDataItem> Items { get; private set; }
        public event RoutedEventHandler ValueChanged;

        public CustomComboControl()
        {
            InitializeComponent();
            Items = new List<ComboDataItem>();
            DefaultItems();
        }
        //更换集合
        public void SetItemSource(List<ComboDataItem> items)
        {
            SelectedIndex = - 1;//为了触发SelectedIndex
            Items = items;
            comBox.ItemsSource = Items;
            SelectedIndex = ((Items == null || Items.Count == 0) ? -1 : 0);
        }

        /// <summary>
        /// 默认集合（字体集合）
        /// </summary>
        private void DefaultItems()
        {
            Items.Clear();
            SelectedIndex = -1;

            var item = new ComboDataItem(3);
            Items.Add(item);
            item = new ComboDataItem(6);
            Items.Add(item);
            item = new ComboDataItem(9);
            Items.Add(item);
            item = new ComboDataItem(12);
            Items.Add(item);
            item = new ComboDataItem(15);
            Items.Add(item);
            item = new ComboDataItem(18);
            Items.Add(item);
            item = new ComboDataItem(21);
            Items.Add(item);
            item = new ComboDataItem(24);
            Items.Add(item);

            comBox.ItemsSource = Items;
            SelectedIndex = ((Items == null || Items.Count == 0) ? -1 : 0);
        }
        private void UserControl_Loaded(object sender, RoutedEventArgs e)
        {
            comBox.SelectionChanged -= comBox_SelectionChanged;
            comBox.SelectionChanged += comBox_SelectionChanged;
        }

        private void comBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            var item = comBox.SelectedItem as ComboDataItem;
            if (item != null)
            {
                Value = item.Value;
                ValueStr = item.ValueStr;
                title.Text = item.Content;

                if (IsValueContent == false)
                    ValueChanged?.Invoke(Value, e);
                else
                    ValueChanged?.Invoke(ValueStr, e);
            }


        }

        public double Value
        {
            get { return (double)GetValue(ValueProperty); }
            set { SetValue(ValueProperty, value); }
        }

        public string ValueStr
        {
            get { return (string)GetValue(ValueStrProperty); }
            set { SetValue(ValueStrProperty, value); }
        }

        public bool IsValueContent
        {
            get { return (bool)GetValue(IsValueContentProperty); }
            set { SetValue(IsValueContentProperty, value); }
        }

        public List<ComboDataItem> ItemSource
        {
            get { return (List<ComboDataItem>)GetValue(ItemSourceProperty); }
            set { SetValue(ItemSourceProperty, value); }
        }

        public int SelectedIndex
        {
            get { return (int)GetValue(SelectedIndexProperty); }
            set { SetValue(SelectedIndexProperty, value); }
        }

        public static readonly DependencyProperty ValueProperty =
           DependencyProperty.Register("Value", typeof(double), typeof(CustomComboControl), new PropertyMetadata(1.0, SelectedValuePropertyChanged));

        public static readonly DependencyProperty ValueStrProperty =
         DependencyProperty.Register("ValueStr", typeof(string), typeof(CustomComboControl), new PropertyMetadata("", SelectedValueStrPropertyChanged));

        public static readonly DependencyProperty ItemSourceProperty =
          DependencyProperty.Register("ItemSource", typeof(List<ComboDataItem>), typeof(CustomComboControl), new PropertyMetadata(null, SelectedItemSourcePropertyChanged));

        public static readonly DependencyProperty SelectedIndexProperty =
        DependencyProperty.Register("SelectedIndex", typeof(int), typeof(CustomComboControl), new PropertyMetadata(-1, SelectedIndexPropertyChanged));

        public static readonly DependencyProperty IsValueContentProperty =
          DependencyProperty.Register("IsValueContent", typeof(bool), typeof(CustomComboControl), new PropertyMetadata(false));

        private static void SelectedValuePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as CustomComboControl;
            var value = (double)e.NewValue;
            if (control != null && control.IsValueContent == false)
            {
                control.ValueChanged?.Invoke(value, null);
            }
        }

        private static void SelectedValueStrPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as CustomComboControl;
            var value = (string)e.NewValue;
            if (control != null && control.IsValueContent)
            {
                control.ValueChanged?.Invoke(value, null);
            }
        }
       
        private static void SelectedItemSourcePropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as CustomComboControl;
            var value = (List<ComboDataItem>)e.NewValue;
            if (control != null)
            {
                control.SelectedIndex = -1;
                control.comBox.ItemsSource = value;
                control.Items = value;
                control.SelectedIndex = ((value == null || value.Count == 0) ? -1 : 0);
            }
        }

        private static void SelectedIndexPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
        {
            var control = d as CustomComboControl;
            var value = (int)e.NewValue;
            if (control != null)
            {
                if(control.comBox.Items != null && control.comBox.Items.Count > 0)
                {
                    control.comBox.SelectedIndex = value;
                }
                control.UpdateSelectedIndex();
            }
        }

        public void UpdateSelectedIndex()
        {
            if(SelectedIndex < 0  || comBox.Items == null || comBox.Items.Count <= SelectedIndex)
            {
                title.Text = "";
            }
            else
            {
                title.Text = Items[SelectedIndex].Content;
            }
        }
    }
}