using System;
using System.Collections.ObjectModel;
using System.Windows;

namespace Muchinfo.DataPager.Base
{
    public class MuchinfoNumericElementsViewModel
    {
        private ObservableCollection<MuchinfoNumericElementViewModel> _elements;
        private string _groupName;
        public ObservableCollection<MuchinfoNumericElementViewModel> Elements
        {
            get
            {
                return this._elements ?? (this._elements = new ObservableCollection<MuchinfoNumericElementViewModel>());
            }
        }
        private string GroupName
        {
            get { return this._groupName ?? (this._groupName = Guid.NewGuid().ToString()); }
        }
        public MuchinfoNumericElementsViewModel(int numericButtonCount, int pageIndex, int pageCount, Style numericButtonStyle)
        {
            this.PopulatePages(numericButtonCount, pageIndex, pageCount, numericButtonStyle);
        }

        public MuchinfoNumericElementsViewModel(int numericButtonCount, int pageIndex, int pageCount)
            : this(numericButtonCount, pageIndex, pageCount, null)
        {
        }
        internal void PopulatePages(int numericButtonCount, int pageIndex, int pageCount, Style numericButtonStyle)
        {
            int buttonStartIndex = MuchinfoNumericElementsViewModel.GetButtonStartIndex(numericButtonCount, pageIndex, pageCount);
            int numericElementsCountWithoutEllipsis = MuchinfoNumericElementsViewModel.GetNumericElementsCountWithoutEllipsis(numericButtonCount, buttonStartIndex, pageCount);
            int num = 0;
            //if (MuchinfoNumericElementsViewModel.ShouldDisplayLeftEllipsis(autoEllipsisMode, buttonStartIndex))
            //{
            //    num = 1;
            //}
            this.Elements.Clear();
            this.AddNumericPageElements(pageIndex, numericElementsCountWithoutEllipsis, buttonStartIndex + num, pageCount, numericButtonStyle);
            this.AddEllipsisElements(numericElementsCountWithoutEllipsis, pageCount, buttonStartIndex + num, numericButtonStyle);
        }
        internal void PopulatePages(int numericButtonCount, int pageIndex, int pageCount)
        {
            this.PopulatePages(numericButtonCount, pageIndex, pageCount, null);
        }
        private static int GetNumericElementsCountWithoutEllipsis(int numericButtonCount, int startIndex, int pageCount)
        {
            int num = 0;
            int num2 = 0;
            //if (MuchinfoNumericElementsViewModel.ShouldDisplayLeftEllipsis(autoEllipsisMode, startIndex))
            //{
            //    num = 1;
            //}
            //if (MuchinfoNumericElementsViewModel.ShouldDisplayRightEllipsis(autoEllipsisMode, numericButtonCount, pageCount, startIndex))
            //{
            //    num2 = 1;
            //}
            return numericButtonCount - num - num2;
        }

        private void AddNumericPageElements(int pageIndex, int numericButtonCountWithoutEllipsis, int startIndex, int pageCount, Style numericButtonStyle)
        {
            int num = startIndex;
            while (num < startIndex + numericButtonCountWithoutEllipsis && num <= pageCount)
            {
                this.Elements.Add(new MuchinfoNumericElementViewModel(num, num - 1, num == pageIndex + 1, this.GroupName, numericButtonStyle));
                num++;
            }
        }
        private void AddEllipsisElements(int numericElementsCountWithoutEllipsis, int pageCount, int startIndex, Style numericButtonStyle)
        {
            string @string = "...";// LocalizationManager.GetString("RadDataPagerEllipsisString");
            int num = this.AddLeftEllipsisIfNeeded(startIndex, @string, numericButtonStyle);
            this.AddRightEllipsisIfNeeded(numericElementsCountWithoutEllipsis, pageCount, startIndex + num, @string, numericButtonStyle);
        }

        private void AddRightEllipsisIfNeeded(int numericButtonCount, int pageCount, int startIndex, string ellipsisString, Style numericButtonStyle)
        {
            //if (MuchinfoNumericElementsViewModel.ShouldDisplayRightEllipsis(autoEllipsisMode, numericButtonCount, pageCount, startIndex))
            //{
            //    this.Elements.Add(new MuchinfoNumericElementViewModel(ellipsisString, startIndex + numericButtonCount - 1, false, this.GroupName, numericButtonStyle));
            //}
        }
        private int AddLeftEllipsisIfNeeded(int startIndex, string ellipsisString, Style numericButtonStyle)
        {
            int result = 0;
            //if (MuchinfoNumericElementsViewModel.ShouldDisplayLeftEllipsis(autoEllipsisMode, startIndex))
            //{
            //    this.Elements.Insert(0, new MuchinfoNumericElementViewModel(ellipsisString, startIndex - 2, false, this.GroupName, numericButtonStyle));
            //    result = 1;
            //}
            return result;
        }

        internal static int GetButtonStartIndex(int numericButtonCount, int pageIndex, int pageCount)
        {
            return Math.Min(Math.Max(pageIndex + 1 - numericButtonCount / 2, 1), Math.Max(pageCount - numericButtonCount + 1, 1));
        }
    }
}