using PDF_Master.CustomControl;
using PDF_Master.Helper;
using PDF_Master.Model;
using Prism.Commands;
using Prism.Mvvm;
using Prism.Services.Dialogs;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace PDF_Master.ViewModels.Dialog.Redaction
{
    public class PageMarkDialogViewModel : BindableBase, IDialogAware
    {
        public string Title => "";

        public event Action<IDialogResult> RequestClose;

        public DelegateCommand OkCommand { get; set; }

        public DelegateCommand CancelCommand { get; set; }

        public DelegateCommand<string> CheckedCommand { get; set; }


        /// <summary>
        /// 当前页
        /// </summary>
        public int CurrentPageIndex { get; set; }


        private string pagecount = "/1";

        /// <summary>
        /// 页面总数
        /// </summary>
        public string PageCount
        {
            get { return pagecount; }
            set
            {
                SetProperty(ref pagecount, value);
            }
        }

        /// <summary>
        /// 页码集合
        /// </summary>
        public List<int> PageList = new List<int>();

        /// <summary>
        /// 文档页面总数
        /// </summary>
        public int pageCount = 0;

        private string custompage;
        /// <summary>
        /// 自定义页面
        /// </summary>
        public string CustomPage
        {
            get { return custompage; }
            set
            {
                SetProperty(ref custompage, value);
                if(!string.IsNullOrEmpty(value))
                {
                    CheckCustomPage();
                }
            }
        }


        public PageMarkDialogViewModel()
        {
            OkCommand = new DelegateCommand(ok);
            CancelCommand = new DelegateCommand(cancel);
            CheckedCommand = new DelegateCommand<string>(check);
        }

        private void cancel()
        {
            RequestClose.Invoke(new DialogResult(ButtonResult.Cancel));
        }

        private void ok()
        {
            DialogParameters valuePairs = new DialogParameters();
            valuePairs.Add(ParameterNames.PageList, PageList);
            RequestClose.Invoke(new DialogResult(ButtonResult.OK, valuePairs));
        }

        private void CheckCustomPage()
        {
            var result = CommonHelper.GetPagesInRange(ref PageList,CustomPage,pageCount,new char[]{ ','},new char[] { '-'});
            if(!result)
            {
                AlertsMessage alertsMessage = new AlertsMessage();
                alertsMessage.ShowDialog("","页码错误","ok");
                CustomPage = "";
                return;
            }
        }

        private void check(string args)
        {
            switch (args)
            {
                case "Odd":
                    PageList = new List<int>();
                    for (int i = 1; i <=pageCount; i++)
                    {
                        if (i % 2 != 0)
                        {
                            PageList.Add(i-1);
                        }
                    }
                    break;
                case "Even":
                    PageList = new List<int>();
                    for (int i = 1; i <= pageCount; i++)
                    {
                        if (i % 2 == 0)
                        {
                            PageList.Add(i - 1);
                        }
                    }
                    break;
                case "All":
                    PageList = new List<int>();
                    for(int i=0;i<pageCount;i++)
                    {
                        PageList.Add(i);
                    }
                    break;
                case "Custom":
                    if(!string.IsNullOrEmpty(CustomPage))
                    {
                        CheckCustomPage();
                    }
                    break;
                default:
                case "Current":
                    PageList = new List<int>();
                    PageList.Add(CurrentPageIndex);
                    break;
            }
        }


        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
   
        }

        public void OnDialogOpened(IDialogParameters parameters)
        {
            int page = parameters.GetValue<int>(ParameterNames.PageCount);
            if(page>0)
            {
                PageCount = "/ " + page;
                pageCount = page;
            }
            PageList = new List<int>();
            for (int i = 0; i < pageCount; i++)
            {
                PageList.Add(i);
            }
            CurrentPageIndex = parameters.GetValue<int>(ParameterNames.CurrentPageIndex);
        }
    }
}