using System;
using System.Linq;
using System.Text.RegularExpressions;
using VDash.Utilities;

namespace VDash.WindowSelectors
{
    public class FromWindowTitle : IWindowSelector
    {
        WindowInfo m_Window = null;
        public bool RefreshOnGet { get; set; } = false;
        public string TitleFilter { get; set; } = "";
        public TitleSearchType SearchType { get; set; } = TitleSearchType.Contains;

        public WindowInfo Window
        {
            get
            {
                if (RefreshOnGet)
                {
                    m_Window = GetWindowUsingFilter();
                    return m_Window;
                }
                else
                {
                    if (m_Window == null)
                    {
                        m_Window = GetWindowUsingFilter();
                    }
                    return m_Window;
                }
            }
        }

        public void ForceWindowRefresh()
        {
            m_Window = GetWindowUsingFilter();
        }

        public FromWindowTitle(string windowFilter, TitleSearchType searchType)
        {
            TitleFilter = windowFilter;
            SearchType = searchType;
        }

        public FromWindowTitle()
        {
        }

        internal WindowInfo GetWindowUsingFilter()
        {
            var windows = WindowInfo.GetWindowList();
            if (SearchType == TitleSearchType.Contains)
            {
                var results = windows.Where(x => x.Title.ToLower().Contains(TitleFilter.ToLower()));
                if(results.Count() == 0)
                {
                    throw new WindowNotFoundException("No windows match the filter settings.");
                }

                return results.First();
            }
            if(SearchType == TitleSearchType.Regex)
            {
                var results = windows.Where(x => Regex.IsMatch(x.Title, TitleFilter));

                if (results.Count() == 0)
                {
                    throw new WindowNotFoundException("No windows match the filter settings.");
                }

                return results.First();
            }

            throw new WindowNotFoundException("Error fetching matching window.");
        }

        public IntPtr GetWindowHandle()
        {
            return Window.hWnd;
        }

        public WindowInfo GetWindowInfo()
        {
            return Window;
        }

        public bool WindowExists()
        {
            //try
            //{
            //    var window = Window;
            //}
            //catch (WindowNotFoundException)
            //{
            //    return false;
            //}
            //return true;

            return User32.IsWindow(GetWindowHandle());
        }

        public enum TitleSearchType
        {
            Contains = 0,
            Regex = 1
        }
    }
}