using FastReport.Code;
using FastReport.Data;
using FastReport.Design.ToolWindows;
using FastReport.Forms;
using FastReport.Utils;
using System;
using System.Drawing;
using System.Reflection;
using System.Windows.Forms;

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

    internal class SyntaxEditorBase : TextBox, ITextEditor
    {
        public void Locate(int line, int column)
        {
            // nope...
        }
    }

    internal class TextEditor : SyntaxEditorBase
    {
    }

    internal class CodePageDesigner : PageDesignerBase
    {
        #region Fields
        private bool canModify;
        #endregion

        #region Properties
        public TextEditor Edit { get; private set; }

        public string Script
        {
            get => Edit.Text;
            set => SetText(value);
        }
        #endregion

        #region Private Methods
        private void CreateEdit()
        {
            Edit = new TextEditor();
            Edit.Multiline = true;
            Edit.AcceptsReturn = true;
            Edit.AcceptsTab = true;
            Edit.Font = DrawUtils.FixedFont;
            Edit.Dock = DockStyle.Fill;
            Edit.BorderStyle = BorderStyle.None;
            Edit.MaxLength = int.MaxValue;
            Edit.AllowDrop = true;
            Edit.DragOver += new DragEventHandler(Edit_DragOver);
            Edit.DragDrop += new DragEventHandler(Edit_DragDrop);
            Controls.Add(Edit);

            Edit.ScrollBars = ScrollBars.Both;
            Edit.TextChanged += new EventHandler(Edit_TextChanged);
            Edit.ImeMode = ImeMode.On;
        }

        private void SetText(string value)
        {
            canModify = false;
            Edit.Text = value;
            Edit.Modified = false;
            canModify = true;
        }

        private void Edit_DragOver(object sender, DragEventArgs e)
        {
            int index = Edit.GetCharIndexFromPosition(Edit.PointToClient(new Point(e.X, e.Y)));
            Edit.Select(index, 0);
            e.Effect = e.AllowedEffect;
        }

        private void Edit_DragDrop(object sender, DragEventArgs e)
        {
            DictionaryWindow.DraggedItem item = DictionaryWindow.DragUtils.GetOne(e);
            if (item == null)
                return;

            CodeHelperBase codeHelper = Designer.ActiveReport.Report.CodeHelper;
            string text = "";
            if (item.obj is Column)
                text = codeHelper.ReplaceColumnName(item.text, (item.obj as Column).DataType);
            else if (item.obj is SystemVariable)
                text = codeHelper.ReplaceVariableName(item.obj as Parameter);
            else if (item.obj is Parameter)
                text = codeHelper.ReplaceParameterName(item.obj as Parameter);
            else if (item.obj is Total)
                text = codeHelper.ReplaceTotalName(item.text);
            else if (item.obj is MethodInfo)
                text = item.text;
            else
                text = "Report.Calc(\"" + item.text + "\")";

            Edit.SelectedText = text;
            Edit.Focus();
        }

        private void Edit_TextChanged(object sender, EventArgs e)
        {
            if (canModify)
                Designer.SetModified(null, "no-undo");
        }

        public void CommitChanges()
        {
            if (Edit.Modified)
            {
                Edit.Modified = false;
                Designer.SetModified(this, "Script");
            }
        }
        #endregion

        #region Public Methods
        public void UpdateFont()
        {

        }

        public void UpdateLanguage()
        {
            // do nothing
        }

        public override bool CanCopy() => true;

        public override void Copy()
        {
            Edit.Copy();
        }

        public override void Cut()
        {
            Edit.Cut();
        }

        public override bool CanPaste() => true;

        public override void Paste()
        {
            Edit.Paste();
        }

        public override bool CanUndo()
        {
            return Edit.CanUndo;
        }

        public override void Undo()
        {
            Edit.Undo();
        }

        public override void SelectAll()
        {
            Edit.SelectAll();
        }

        public override void ResetModified()
        {
            Edit.Modified = false;
        }

        public override void FillObjects(bool resetSelection)
        {
            // do nothing
        }

        public override void PageDeactivated()
        {
            base.PageDeactivated();
            CommitChanges();
        }
        #endregion

        #region IDesignerPlugin
        public override void SaveState()
        {
            CodePageSettings.SaveState();
        }

        public override void RestoreState()
        {
        }

        public override DesignerOptionsPage GetOptionsPage()
        {
            return new CodePageOptions(this);
        }
        #endregion

        public CodePageDesigner(Designer designer) : base(designer)
        {
            Name = "Code";
            CreateEdit();
        }
    }

}