using System;
using System.Collections;
using System.Collections.Generic;
using System.Runtime.CompilerServices;
using System.Windows.Forms;

namespace FastReport.Design.PageDesigners.Code
{
    internal interface ITextEditor
    {
        string Text { get; set; }
        void Focus();
        void Select(int start, int length);
    }

    public enum SyntaxType
    {
        None,
        Cs,
        Vb,
        Xml
    }

    public abstract class SyntaxEditorBase : Control, ITextEditor
    {
        public abstract string SelectedText { get; set; }

        public abstract bool Modified { get; set; }

        public abstract bool ShowLineNumbers { get; set; }

        public abstract bool EnableVirtualSpace { get; set; }

        public abstract bool ConvertTabsToSpaces { get; set; }

        public abstract int IndentationSize { get; set; }

        public abstract SyntaxType SyntaxType { get; set; }

        public abstract bool AllowCodeCompletion { get; set; }

        public new event EventHandler TextChanged;

        protected void OnTextChanged() => TextChanged?.Invoke(this, EventArgs.Empty);

        public abstract void Cut();

        public abstract void Copy();

        public abstract void Paste();

        public abstract bool CanUndo { get; }

        public abstract void Undo();

        public abstract bool CanRedo { get; }

        public abstract void Redo();

        public abstract void SelectAll();

        public abstract new void Focus();

        public abstract void Locate(int line, int column);

        public abstract void Select(int start, int length);

        public abstract void SetCaretFromMousePosition(System.Drawing.Point pos);

        // for code completion
        public abstract void UpdateInternals(Report report);
    }

    public enum SyntaxEditorKind
    {
        Code,
        Xml
    }

    public static class SyntaxEditorClass
    {
        private static Dictionary<SyntaxEditorKind, Type> syntaxEditorTypes;

        private static Dictionary<SyntaxEditorKind, Type> SyntaxEditorTypes
        {
            get
            {
                if (syntaxEditorTypes == null)
                {
                    syntaxEditorTypes = new Dictionary<SyntaxEditorKind, Type>();
                    syntaxEditorTypes[SyntaxEditorKind.Code] = typeof(AvalonSyntaxEditor);
                    syntaxEditorTypes[SyntaxEditorKind.Xml] = typeof(AvalonSyntaxEditor);
                }
                return syntaxEditorTypes;
            }
        }

        internal static SyntaxEditorBase CreateInstance(SyntaxEditorKind editorKind) => Activator.CreateInstance(SyntaxEditorTypes[editorKind]) as SyntaxEditorBase;

        public static void Register(Type editorType, SyntaxEditorKind editorKind)
        {
            if (!typeof(SyntaxEditorBase).IsAssignableFrom(editorType))
                throw new ArgumentException("editorType must be of SyntaxEditorBase type");

            SyntaxEditorTypes[editorKind] = editorType;
        }
    }
}