using FastReport.Forms;
using FastReport.Utils;
using System;
using System.Windows.Forms;


namespace FastReport.Design.PageDesigners.Code
{
    internal class FRXPageDesigner : PageDesignerBase
    {
        #region Fields
        private SyntaxEditorBase edit;
        private bool editInitialized;
        private bool canModify;
        #endregion

        #region Properties
        public SyntaxEditorBase Edit
        {
            get
            {
                if (!editInitialized)
                    CreateEdit();
                return edit;
            }
        }

        public override Report Report => Designer.ActiveReport;
        #endregion

        #region Private Methods
        private void CreateEdit()
        {
            editInitialized = true;
            edit = SyntaxEditorClass.CreateInstance(SyntaxEditorKind.Xml);
            edit.Font = DrawUtils.FixedFont;
            edit.Dock = DockStyle.Fill;
            edit.BorderStyle = BorderStyle.None;
            edit.AllowDrop = true;
            Controls.Add(edit);

            edit.TextChanged += Edit_TextChanged;
            edit.ImeMode = ImeMode.On;
            edit.SyntaxType = SyntaxType.Xml;

            UpdateOptions();
            UpdateFont();
        }

        private void UpdateOptions()
        {
            Edit.ShowLineNumbers = true;
            Edit.ConvertTabsToSpaces = CodePageSettings.UseSpaces;
            Edit.IndentationSize = CodePageSettings.TabSize;
        }

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

        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.ActiveReportTab.UpdateFromFRX(Edit.Text);
            }
        }

        #endregion

        #region Public Methods
        public void UpdateFont()
        {
            Edit.Font = this.LogicalToDevice(Storage.GetFont("CodePageDesigner,CodePage", DrawUtils.FixedFont));
        }

        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 bool CanRedo()
        {
            return Edit.CanRedo;
        }

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

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

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

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

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

        public override void PageActivated()
        {
            base.PageActivated();
            SetText();
            Edit.Focus();
        }
        #endregion

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

        public override void RestoreState()
        {
        }

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

        public FRXPageDesigner(Designer designer) : base(designer)
        {
            Name = "FRX";
        }
    }
}