using System.Drawing;
using System.Runtime.InteropServices;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.International.Converters.TraditionalChineseToSimplifiedConverter;
using NppChnConvPlugin.NppPluginInfrastructure;

namespace NppChnConvPlugin
{
    internal static class PluginBridge
    {
        private static readonly IScintillaGateway CurrentEditor = new ScintillaGateway(PluginBase.GetCurrentScintilla());

        // for get current editing file info
        private static readonly INotepadPPGateway Notepad = new NotepadPPGateway();

        public static bool Enable { get; private set; }

        public static void SetupPluginMenu()
        {
            PluginBase.SetCommand(0, "Convert To CHS", ConvertToChs);
            PluginBase.SetCommand(1, "Convert To CHT", ConvertToCht);
        }

        public static void SetupToolBarIcon()
        {
            var toolbarIcons = new toolbarIcons { hToolbarBmp = Properties.Resources.Bitmap1.GetHbitmap() };
            var pTbIcons = Marshal.AllocHGlobal(Marshal.SizeOf(toolbarIcons));
            Marshal.StructureToPtr(toolbarIcons, pTbIcons, false);
            Win32.SendMessage(PluginBase.nppData._nppHandle, (uint)NppMsg.NPPM_ADDTOOLBARICON, PluginBase._funcItems.Items[0]._cmdID, pTbIcons);
            Marshal.FreeHGlobal(pTbIcons);

            toolbarIcons = new toolbarIcons { hToolbarBmp = Properties.Resources.Bitmap2.GetHbitmap() };
            pTbIcons = Marshal.AllocHGlobal(Marshal.SizeOf(toolbarIcons));
            Marshal.StructureToPtr(toolbarIcons, pTbIcons, false);
            Win32.SendMessage(PluginBase.nppData._nppHandle, (uint)NppMsg.NPPM_ADDTOOLBARICON, PluginBase._funcItems.Items[1]._cmdID, pTbIcons);
            Marshal.FreeHGlobal(pTbIcons);
        }

        private static void ConvertToChs() => DoConvertSelect(ChineseConversionDirection.TraditionalToSimplified);
        private static void ConvertToCht() => DoConvertSelect(ChineseConversionDirection.SimplifiedToTraditional);

        private static void DoConvertSelect(ChineseConversionDirection chineseConversionDirection)
        {
            CurrentEditor.BeginUndoAction();

            var selections = CurrentEditor.GetSelections();

            for (int i = selections - 1; i >= 0; i--)
            {
                var start = CurrentEditor.GetSelectionNStart(i);
                var end = CurrentEditor.GetSelectionNEnd(i);
                if (end.Value - start.Value < 1) continue;

                CurrentEditor.SetTargetStart(start);
                CurrentEditor.SetTargetEnd(end);

                var text = CurrentEditor.GetTargetText();
                var convert = ChineseConverter.Convert(text, chineseConversionDirection);

                var len = CurrentEditor.EncodedFromUTF8Len(convert);
                CurrentEditor.ReplaceTarget(len, convert);
            }

            CurrentEditor.EndUndoAction();
        }



        public static void FlushState()
        {
            CurrentEditor.SetScintillaHandle(PluginBase.GetCurrentScintilla());
        }

        public static void UpdateText()
        {
        }

        public static void UpdateScroll()
        {

        }

        public static void Exit()
        {

        }
    }
}