{
 ***************************************************************************
 *                                                                         *
 *   This source is free software; you can redistribute it and/or modify   *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
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 ***************************************************************************

  Author: Mattias Gaertner

  Abstract:
    A dialog to create a variable declaration.
    It uses the identifier in the source editor to guess the name and type, so
    that the user only needs to choose where to create the var.
}
unit DeclareVarDlg;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, LCLProc, contnrs, LResources, Forms, Controls, Graphics,
  Dialogs, ButtonPanel, StdCtrls, ExtCtrls,
  IDEDialogs, LazIDEIntf, SrcEditorIntf,
  FileProcs, CodeToolManager, FindDeclarationTool, CodeTree, CodeCache,
  KeywordFuncLists, BasicCodeTools,
  CodyUtils, CodyStrConsts;

type

  { TCodyDeclareVarTarget }

  TCodyDeclareVarTarget = class
  public
    Tool: TFindDeclarationTool;
    NodeDesc: TCodeTreeNodeDesc;
    NodeStartPos: TCodeXYPosition;
    Visibility: TCodeTreeNodeDesc;
    Caption: string;
    constructor Create(const Context: TFindContext);
  end;

  { TCodyClipboardDeclareVar }

  TCodyClipboardDeclareVar = class(TCodyClipboardSrcData)
  public
    VarName: string;
    VarType: string;
    TheUnitName: string;
    procedure WriteToStream(MemStream: TMemoryStream); override;
    procedure ReadFromStream(MemStream: TMemoryStream); override;
    procedure Execute(SrcEdit: TSourceEditorInterface; LogXY: TPoint); override;
  end;

  { TCodyDeclareVarDialog }

  TCodyDeclareVarDialog = class(TForm)
    ButtonPanel1: TButtonPanel;
    Panel1: TPanel;
    TypeEdit: TEdit;
    TypeLabel: TLabel;
    WhereRadioGroup: TRadioGroup;
    RedefineLabel: TLabel;
    procedure HelpButtonClick(Sender: TObject);
    procedure OKButtonClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
  private
  public
    CodePos: TCodeXYPosition;
    Tool: TCodeTool;
    Identifier: string;
    RecommendedType: string;
    UnitOfType: string;
    Targets: TObjectList; // list of TCodyDeclareVarTarget
    function Run: boolean;
  end;


procedure ShowDeclareVariableDialog(Sender: TObject);

function CheckCreateVarFromIdentifierInSrcEdit(out CodePos: TCodeXYPosition;
  out Tool: TCodeTool; out NewIdentifier, NewType, NewUnitName: string;
  out ExistingDefinition: TFindContext;
  out PossibleContexts: TFPList): boolean;

implementation

procedure ShowDeclareVariableDialog(Sender: TObject);
var
  CodyDeclareVarDialog: TCodyDeclareVarDialog;
begin
  CodyDeclareVarDialog:=TCodyDeclareVarDialog.Create(nil);
  try
    CodyDeclareVarDialog.Run;
  finally
    CodyDeclareVarDialog.Free;
  end;
end;

function CheckCreateVarFromIdentifierInSrcEdit(
  out CodePos: TCodeXYPosition; out Tool: TCodeTool;
  out NewIdentifier, NewType, NewUnitName: string;
  out ExistingDefinition: TFindContext;
  out PossibleContexts: TFPList // list of PFindContext
  ): boolean;

  procedure ErrorNotAtAnIdentifier;
  begin
    IDEMessageDialog(crsCWError,
      Format(crsPleasePlaceTheCursorOfTheSourceEditorAtAnIdentifie, [LineEnding, LineEnding]),
      mtError,[mbCancel]);
  end;

var
  CleanPos: integer;
  CursorNode: TCodeTreeNode;
  Handled: boolean;
  IsKeyword: boolean;
  NewExprType: TExpressionType;
  IsSubIdentifier: boolean;
begin
  Result:=false;
  NewType:='';
  NewIdentifier:='';
  NewUnitName:='';
  CodePos:=CleanCodeXYPosition;
  Tool:=nil;
  ExistingDefinition:=CleanFindContext;
  PossibleContexts:=nil;

  if (ParseTilCursor(Tool,CleanPos,CursorNode,Handled,true,@CodePos)<>cupeSuccess)
  and not Handled then begin
    ErrorNotAtAnIdentifier;
    exit;
  end;

  Handled:=false;
  try
    try
      if not CodeToolBoss.GuessTypeOfIdentifier(CodePos.Code,CodePos.X,CodePos.Y,
        IsKeyword,IsSubIdentifier,ExistingDefinition,PossibleContexts,
        NewExprType,NewType)
      then begin
        debugln(['CheckCreateVarFromIdentifierInSrcEdit GuessTypeOfIdentifier failed']);
        exit;
      end;

      NewIdentifier:=GetIdentifier(@Tool.Src[GetIdentStartPosition(Tool.Src,CleanPos)]);
      if IsKeyword then begin
        Handled:=true;
        IDEMessageDialog(crsCWError, Format(crsDVIsAKeyword, [NewIdentifier]),
          mtError, [mbCancel]);
        exit;
      end;

      // check if newtype is a variable and if it is in another unit
      if (NewExprType.Desc=xtContext) then begin
        if NewExprType.Context.Tool<>Tool then
          NewUnitName:=NewExprType.Context.Tool.GetSourceName;
      end;

      Handled:=true;
      Result:=true;
    except
      on e: Exception do CodeToolBoss.HandleException(e);
    end;
  finally
    //debugln(['CheckCreateVarFromIdentifierInSrcEdit Handled=',Handled,' CTError=',CodeToolBoss.ErrorMessage]);
    // syntax error or not in a method
    if not Handled then begin
      if CodeToolBoss.ErrorMessage<>'' then
        LazarusIDE.DoJumpToCodeToolBossError
      else
        ErrorNotAtAnIdentifier;
    end;
  end;
end;

{ TCodyClipboardDeclareVar }

procedure TCodyClipboardDeclareVar.WriteToStream(MemStream: TMemoryStream);
begin
  inherited WriteToStream(MemStream);
  WriteString(MemStream,VarName);
  WriteString(MemStream,VarType);
  WriteString(MemStream,TheUnitName);
end;

procedure TCodyClipboardDeclareVar.ReadFromStream(MemStream: TMemoryStream);
begin
  inherited ReadFromStream(MemStream);
  VarName:=ReadString(MemStream);
  VarType:=ReadString(MemStream);
  TheUnitName:=ReadString(MemStream);
end;

procedure TCodyClipboardDeclareVar.Execute(SrcEdit: TSourceEditorInterface;
  LogXY: TPoint);
var
  OldChange: Boolean;
  Code: TCodeBuffer;
begin
  //debugln(['TCodyClipboardDeclareVar.Execute ']);
  if not LazarusIDE.BeginCodeTools then exit;

  Code:=SrcEdit.CodeToolsBuffer as TCodeBuffer;

  OldChange:=LazarusIDE.OpenEditorsOnCodeToolChange;
  try
    LazarusIDE.OpenEditorsOnCodeToolChange:=true;
    if not CodeToolBoss.DeclareVariableAt(Code,LogXY.X,LogXY.Y,
      VarName,VarType,TheUnitName)
    then begin
      debugln(['TCodyClipboardDeclareVar.Execute Error']);
      LazarusIDE.DoJumpToCodeToolBossError;
    end;
  finally
    LazarusIDE.OpenEditorsOnCodeToolChange:=OldChange;
  end;
end;

{ TCodyDeclareVarTarget }

constructor TCodyDeclareVarTarget.Create(const Context: TFindContext);
begin
  Tool:=Context.Tool;
  if Context.Node<>nil then begin
    NodeDesc:=Context.Node.Desc;
    Context.Tool.CleanPosToCaret(Context.Node.StartPos,NodeStartPos);
  end;
end;

{$R *.lfm}

{ TCodyDeclareVarDialog }

procedure TCodyDeclareVarDialog.FormCreate(Sender: TObject);
begin
  Targets:=TObjectList.create(true);
  ButtonPanel1.OKButton.OnClick:=@OKButtonClick;
  ButtonPanel1.HelpButton.OnClick:=@HelpButtonClick;
end;

procedure TCodyDeclareVarDialog.OKButtonClick(Sender: TObject);
var
  NewType: TCaption;
begin
  NewType:=Trim(TypeEdit.Text);
  if NewType='' then begin
    IDEMessageDialog(crsCWError, crsPleaseSpecifyAType, mtError, [mbCancel]);
    exit;
  end;
  if CompareTextIgnoringSpace(NewType,RecommendedType,false)<>0 then begin
    debugln(['TCodyDeclareVarDialog.OKButtonClick using custom type "',NewType,'"']);
    UnitOfType:='';
  end;
  if WhereRadioGroup.ItemIndex<0 then begin
    IDEMessageDialog(crsCWError, crsPleaseSpecifyALocation, mtError, [mbCancel
      ]);
    exit;
  end;
  ModalResult:=mrOk;
end;

procedure TCodyDeclareVarDialog.HelpButtonClick(Sender: TObject);
begin
  OpenCodyHelp('#Declare_Variable');
end;

procedure TCodyDeclareVarDialog.FormDestroy(Sender: TObject);
begin
  Targets.Free;
end;

function TCodyDeclareVarDialog.Run: boolean;

  procedure AddClassTarget(Context: TFindContext; Visibility: TCodeTreeNodeDesc);
  var
    Target: TCodyDeclareVarTarget;
    s: String;
  begin
    case Visibility of
    ctnClassPrivate: s:=crsPrivate;
    ctnClassProtected: s:=crsProtected;
    ctnClassPublic: s:=crsPublic;
    ctnClassPublished: s:=crsPublished;
    else exit;
    end;
    Target:=TCodyDeclareVarTarget.Create(Context);
    Target.Visibility:=Visibility;
    s:=Format(crsMemberOf, [s, Context.Node.DescAsString, Context.Tool.
      ExtractClassName(Context.Node, false, true)]);
    Target.Caption:=s;
    Targets.Add(Target);
  end;

var
  PossibleContexts: TFPList;
  Target: TCodyDeclareVarTarget;
  Context: TFindContext;
  i: Integer;
  OldChange: boolean;
  OldSrcEdit: TSourceEditorInterface;
  NewType: String;
  ExistingDefinition: TFindContext;
  Node: TCodeTreeNode;
  Clip: TCodyClipboardDeclareVar;
begin
  Result:=false;
  PossibleContexts:=nil;
  Targets.Clear;
  try
    if not CheckCreateVarFromIdentifierInSrcEdit(CodePos,Tool,Identifier,
      RecommendedType,UnitOfType,ExistingDefinition,PossibleContexts)
    then exit;

    if ExistingDefinition.Node<>nil then begin
      RedefineLabel.Visible:=true;
      RedefineLabel.Caption:=Format(crsAlreadyDefinedAt, [ExistingDefinition.
        Tool.CleanPosToRelativeStr(
        ExistingDefinition.Node.StartPos, CodePos.Code.Filename)]);
    end else begin
      RedefineLabel.Visible:=false;
    end;

    if PossibleContexts<>nil then begin
      for i:=0 to PossibleContexts.Count-1 do begin
        Context:=PFindContext(PossibleContexts[i])^;
        if Context.Node.Desc=ctnProcedure then begin
          Target:=TCodyDeclareVarTarget.Create(Context);
          Target.Caption:=Format(crsLocalVariableOf, [Context.Tool.
            ExtractProcName(Context.Node, [])]);
          Targets.Add(Target);
        end else if Context.Node.Desc in AllClassObjects then begin
          AddClassTarget(Context,ctnClassPrivate);
          AddClassTarget(Context,ctnClassProtected);
          AddClassTarget(Context,ctnClassPublic);
          AddClassTarget(Context,ctnClassPublished);
        end else if Context.Node.Desc=ctnImplementation then begin
          Target:=TCodyDeclareVarTarget.Create(Context);
          Target.Caption:=crsInImplementation;
          Targets.Add(Target);
          Node:=Context.Node.PriorBrother;
          if (Node<>nil) and (Node.Desc=ctnInterface) then begin
            Target:=TCodyDeclareVarTarget.Create(CreateFindContext(Context.Tool,Node));
            Target.Caption:=crsInInterface;
            Targets.Add(Target);
          end;
        end;
      end;
    end;
  finally
    FreeListOfPFindContext(PossibleContexts);
  end;

  if Targets.Count=0 then begin
    IDEMessageDialog(crsAlreadyDefined,
      Format(crsTheIdentifierIsAlreadyDefined, [Identifier]), mtError, [mbCancel
        ]);
    exit;
  end;

  // add target for clipboard
  Target:=TCodyDeclareVarTarget.Create(CleanFindContext);
  Target.Caption:=crsOnClipboard;
  Targets.Add(Target);

  Caption:=Format(crsDeclareVariable3, [Identifier]);
  TypeLabel.Caption:=crsType;
  TypeEdit.Text:=RecommendedType;

  WhereRadioGroup.Caption:=crsWhere;
  for i:=0 to Targets.Count-1 do begin
    Target:=TCodyDeclareVarTarget(Targets[i]);
    WhereRadioGroup.Items.Add(Target.Caption);
  end;
  WhereRadioGroup.ItemIndex:=0;

  ButtonPanel1.HelpButton.Caption:=crsHelp;
  ButtonPanel1.OKButton.Caption:=crsBTNOK;
  ButtonPanel1.CancelButton.Caption:=crsBTNCancel;

  // show dialog as modal form
  Result:=ShowModal=mrOk;

  if Result then begin
    if not LazarusIDE.BeginCodeTools then exit;

    NewType:=Trim(TypeEdit.Text);
    Target:=TCodyDeclareVarTarget(Targets[WhereRadioGroup.ItemIndex]);

    if Target.Tool=nil then begin
      // on clipboard
      Clip:=TCodyClipboardDeclareVar.Create;
      try
        Clip.AsText:=CodeToolBoss.SourceChangeCache.BeautifyCodeOptions.BeautifyStatement(
          'var '+Identifier+':'+NewType,0)+';';
        Clip.SetSourcePos(CodePos);
        Clip.VarName:=Identifier;
        Clip.VarType:=NewType;
        Clip.TheUnitName:=UnitOfType;
        Cody.WriteToClipboard(Clip);
      finally
        Clip.Free;
      end;
      exit;
    end;

    OldChange:=LazarusIDE.OpenEditorsOnCodeToolChange;
    try
      OldSrcEdit:=SourceEditorManagerIntf.ActiveEditor;
      LazarusIDE.OpenEditorsOnCodeToolChange:=true;
      if not CodeToolBoss.DeclareVariableNearBy(
        CodePos.Code,CodePos.X,CodePos.Y,
        Identifier,NewType,UnitOfType,Target.Visibility,
        Target.NodeStartPos.Code,Target.NodeStartPos.X,Target.NodeStartPos.Y)
      then begin
        debugln(['TCodyDeclareVarDialog.Run Error']);
        LazarusIDE.DoJumpToCodeToolBossError;
        ModalResult:=mrCancel;
        exit;
      end;
      if Target.NodeStartPos.Code<>CodePos.Code then begin
        // declaration was in another unit => switch back to cursor
        //debugln(['TCodyDeclareVarDialog.OKButtonClick switching back to ',OldSrcEdit.FileName]);
        SourceEditorManagerIntf.ActiveEditor:=OldSrcEdit;
      end;
    finally
      LazarusIDE.OpenEditorsOnCodeToolChange:=OldChange;
    end;
  end;
end;

initialization
  Cody.RegisterClipboardFormat(TCodyClipboardDeclareVar);

end.