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 RepeatMarkDialogViewModel : 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; }

        private int pageCount;
        /// <summary>
        /// 最大页码
        /// </summary>
        public int PageCount
        {
            get { return pageCount; }
            set
            {
                SetProperty(ref pageCount, value);
            }
        }

        private string inputString;

        public string InputString
        {
            get { return inputString; }
            set
            {
                SetProperty(ref inputString, value);
                if (!string.IsNullOrEmpty(value))
                {
                    CheckCustomPage();
                }
            }
        }

        public List<int> PageList = new List<int>();

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

        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(InputString))
                    {
                        CheckCustomPage();
                    }
                    break;
                default:
                    break;
            }
        }

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


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

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

        public bool CanCloseDialog()
        {
            return true;
        }

        public void OnDialogClosed()
        {
           
        }

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