// ***************************************************************************
//
// Delphi MVC Framework
//
// Copyright (c) 2010-2017 Daniele Teti and the DMVCFramework Team
//
// https://github.com/danieleteti/delphimvcframework
//
// ***************************************************************************
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// ***************************************************************************

unit MVCFramework.View.Renderers.Mustache;

interface

uses
  MVCFramework, System.Generics.Collections, System.SysUtils,
  MVCFramework.Commons, System.IOUtils;

type
  { This class implements the mustache view engine for server side views }
  TMVCMustacheViewEngine = class(TMVCBaseViewEngine)
  public
    procedure Execute; override;
  end;

implementation

uses
  SynMustache,
  SynCommons;

{$WARNINGS OFF}

procedure TMVCMustacheViewEngine.Execute;
var
  ViewFileName: string;
  ViewTemplate: RawUTF8;
  ViewEngine: TSynMustache;
  DataObj: TPair<string, string>;
  lSJSON: String;
  lFirst: Boolean;
begin
  ViewFileName := GetRealFileName(ViewName);
  if not FileExists(ViewFileName) then
    raise EMVCFrameworkViewException.CreateFmt('View [%s] not found', [ViewName]);

  ViewTemplate := StringToUTF8(TFile.ReadAllText(ViewFileName, TEncoding.UTF8));
  ViewEngine := TSynMustache.Parse(ViewTemplate);
  lSJSON := '{';
  if Assigned(ViewModel) then
  begin
    lFirst := True;
    for DataObj in ViewModel do
    begin
      if not lFirst then
        lSJSON := lSJSON + ',';
      lSJSON := lSJSON + '"' + DataObj.Key + '":' + DataObj.Value;
      lFirst := False;
    end;
    lSJSON := lSJSON + '}';
  end;
  SetOutput(UTF8Tostring(ViewEngine.RenderJSON(lSJSON)));
end;

{$WARNINGS ON}

end.