unit LinkedDashboardForm;

// A form created in code that links KPI, chart and grid widgets of a
// TAtlasDashboard to one TAtlasTable. A region filter, a new row and a saved
// layout each refresh every widget from the same snapshot.

interface

uses
  System.Classes, Vcl.Forms, Vcl.Controls, Vcl.StdCtrls, Vcl.ExtCtrls,
  Atlas.Data, Atlas.Dashboard;

type
  TLinkedDashboardForm = class(TForm)
  private
    FSource: TAtlasTable;
    FDashboard: TAtlasDashboard;
    FRegion: TComboBox;
    FStatus: TLabel;
    FLayoutFile: string;
    procedure RegionChanged(Sender: TObject);
    procedure AddSaleClick(Sender: TObject);
    procedure SaveLayoutClick(Sender: TObject);
    procedure LoadLayoutClick(Sender: TObject);
    procedure ShowStatus(const Note: string = '');
  public
    constructor Create(AOwner: TComponent); override;
    property Dashboard: TAtlasDashboard read FDashboard;
  end;

function SalesTable(Owner: TComponent): TAtlasTable;

implementation

uses
  System.SysUtils, System.IOUtils, Vcl.Graphics, Atlas.Analytics;

function SalesTable(Owner: TComponent): TAtlasTable;
begin
  Result := TAtlasTable.Create(Owner);
  Result.AddColumn('Region');
  Result.AddColumn('Product');
  Result.AddColumn('Revenue', ackNumber);
  Result.AddColumn('Units', ackNumber);
  Result.AddColumn('Booked', ackDate);
  Result.ImportCSV(
    'Region,Product,Revenue,Units,Booked' + sLineBreak +
    'East,Desktop,18000,12,2026-09-01' + sLineBreak +
    'West,Desktop,22500,15,2026-09-02' + sLineBreak +
    'East,Service,6400,8,2026-09-03' + sLineBreak +
    'North,Desktop,12000,8,2026-09-04' + sLineBreak +
    'West,Service,9600,12,2026-09-05' + sLineBreak +
    'North,Service,4800,6,2026-09-06');
end;

constructor TLinkedDashboardForm.Create(AOwner: TComponent);
var
  Header: TPanel;

  function AddButton(Left: Integer; const Caption: string; OnClick: TNotifyEvent): TButton;
  begin
    Result := TButton.Create(Self);
    Result.Parent := Header;
    Result.SetBounds(Left, 13, 110, 30);
    Result.Caption := Caption;
    Result.OnClick := OnClick;
  end;

begin
  inherited CreateNew(AOwner);
  Caption := 'Atlas Analytics: linked dashboard';
  Width := 1200;
  Height := 860;
  Position := poScreenCenter;
  Font.Name := 'Segoe UI';
  Font.Size := 10;
  FLayoutFile := TPath.Combine(TPath.GetDirectoryName(ParamStr(0)), 'dashboard-layout.json');

  Header := TPanel.Create(Self);
  Header.Parent := Self;
  Header.Align := alTop;
  Header.Height := 56;
  Header.BevelOuter := bvNone;
  Header.Color := $003D2C1E;
  Header.ParentBackground := False;

  FRegion := TComboBox.Create(Self);
  FRegion.Parent := Header;
  FRegion.SetBounds(16, 14, 150, 28);
  FRegion.Style := csDropDownList;
  FRegion.Items.Add('All regions');
  FRegion.Items.Add('East');
  FRegion.Items.Add('West');
  FRegion.Items.Add('North');
  FRegion.ItemIndex := 0;
  FRegion.OnChange := RegionChanged;
  AddButton(182, 'Add a sale', AddSaleClick);
  AddButton(300, 'Save layout', SaveLayoutClick);
  AddButton(418, 'Load layout', LoadLayoutClick);

  FStatus := TLabel.Create(Self);
  FStatus.Parent := Header;
  FStatus.SetBounds(548, 18, 630, 22);
  FStatus.AutoSize := False;
  FStatus.Font.Color := clWhite;

  // The table is owned by the form; the dashboard only listens to it.
  FSource := SalesTable(Self);
  FDashboard := TAtlasDashboard.Create(Self);
  FDashboard.Parent := Self;
  FDashboard.Align := alClient;
  FDashboard.Source := FSource;
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awKPI, 'Revenue', 'Revenue'));
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awKPI, 'Average sale', 'Revenue', amAverage));
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awKPI, 'Orders', '', amCount));
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awChart, 'Revenue by region', 'Revenue', amSum, 'Region'));
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awChart, 'Units by product', 'Units', amSum, 'Product'));
  FDashboard.AddWidget(TAtlasWidgetDefinition.Create(awGrid, 'Sales detail', ''));
  ShowStatus;
end;

procedure TLinkedDashboardForm.RegionChanged(Sender: TObject);
begin
  // SetFilters rebuilds every widget from one filtered snapshot. The source
  // table keeps its own filter and sort; a bad filter raises and leaves the
  // previous filters in place.
  if FRegion.ItemIndex > 0 then
    FDashboard.SetFilters([TAtlasFilter.Create('Region', FRegion.Text)])
  else
    FDashboard.SetFilters([]);
  ShowStatus;
end;

procedure TLinkedDashboardForm.AddSaleClick(Sender: TObject);
begin
  // The dashboard listens to the table, so every widget updates by itself.
  FSource.AddRow(['West', 'Service', '1500', '2', '2026-09-07']);
  ShowStatus('Added a West/Service sale of 1500');
end;

procedure TLinkedDashboardForm.SaveLayoutClick(Sender: TObject);
begin
  // ToJSON persists widget definitions and dashboard filters, not the data.
  TFile.WriteAllText(FLayoutFile, FDashboard.ToJSON, TEncoding.UTF8);
  ShowStatus('Layout saved to ' + FLayoutFile);
end;

procedure TLinkedDashboardForm.LoadLayoutClick(Sender: TObject);
begin
  if not FileExists(FLayoutFile) then
  begin
    ShowStatus('Save a layout first');
    Exit;
  end;
  // LoadJSON validates every widget against the current source before it
  // replaces anything; an invalid file leaves the current widgets in place.
  FDashboard.LoadJSON(TFile.ReadAllText(FLayoutFile, TEncoding.UTF8));
  ShowStatus('Layout loaded from ' + FLayoutFile);
end;

procedure TLinkedDashboardForm.ShowStatus(const Note: string);
var
  Text: string;
  Widget: TAtlasDashboardWidget;
  I: Integer;
begin
  Text := Format('%d source rows, %d widgets', [FSource.RowCount, FDashboard.WidgetCount]);
  for I := 0 to FDashboard.WidgetCount - 1 do
  begin
    Widget := FDashboard.Widgets[I];
    if (Widget.Definition.Kind = awKPI) and Assigned(Widget.Data) then
      Text := Text + Format(', %s %s', [Widget.Definition.Title, Widget.Data.Cell(0, 0)]);
  end;
  if FDashboard.LastError <> '' then
    Text := 'Last error: ' + FDashboard.LastError
  else if Note <> '' then
    Text := Note + ' (' + Text + ')';
  FStatus.Caption := Text;
end;

end.