unit uCommonUtils;

interface

uses
  SysUtils, Classes, System.JSON, System.Generics.Collections, System.UITypes,
  FMX.Forms, FMX.Controls, FMX.StdCtrls;

type
  TValidationResult = record
    IsValid: Boolean;
    ErrorMessage: string;
    ErrorField: string;
    procedure Clear;
    class function Success: TValidationResult; static;
    class function Failure(const AErrorField, AErrorMessage: string): TValidationResult; static;
  end;

  TValidator = class
  public
    class function IsEmpty(const AValue: string): Boolean; static;
    class function IsInteger(const AValue: string): Boolean; static;
    class function IsFloat(const AValue: string): Boolean; static;
    class function IsDateTime(const AValue: string): Boolean; static;
    class function IsEmail(const AValue: string): Boolean; static;
    class function IsPhone(const AValue: string): Boolean; static;
    class function IsIPAddress(const AValue: string): Boolean; static;
    class function MinLength(const AValue: string; AMinLen: Integer): Boolean; static;
    class function MaxLength(const AValue: string; AMaxLen: Integer): Boolean; static;
    class function InRange(const AValue: string; AMin, AMax: Double): Boolean; static;
    class function ValidateBarcode(const ABarcode: string): TValidationResult; static;
    class function ValidateLotNo(const ALotNo: string): TValidationResult; static;
    class function ValidateMaterialCode(const AMaterialCode: string): TValidationResult; static;
  end;

  TStringHelperEx = class helper for TStringHelper
  public
    function IsInteger: Boolean;
    function IsFloat: Boolean;
    function ToIntegerDef(ADefault: Integer): Integer;
    function ToFloatDef(ADefault: Double): Double;
    function TrimLeft: string;
    function TrimRight: string;
    function RemoveWhitespace: string;
    function Contains(const ASubStr: string): Boolean;
    function StartsWith(const AStr: string): Boolean;
    function EndsWith(const AStr: string): Boolean;
    function ReplaceAll(const AFrom, ATo: string): string;
  end;

  TDateTimeHelper = class
  public
    class function FormatDateTime(const AFormat: string; ADateTime: TDateTime): string; static;
    class function ParseDateTime(const AValue: string): TDateTime; static;
    class function GetDateOnly(ADateTime: TDateTime): TDate; static;
    class function GetTimeOnly(ADateTime: TDateTime): TTime; static;
    class function StartOfDay(ADateTime: TDateTime): TDateTime; static;
    class function EndOfDay(ADateTime: TDateTime): TDateTime; static;
    class function GetAge(ABirthDate: TDateTime): Integer; static;
    class function IsToday(ADateTime: TDateTime): Boolean; static;
    class function IsSameDay(ADate1, ADate2: TDateTime): Boolean; static;
  end;

  TFileHelper = class
  public
    class function ReadTextFile(const AFileName: string; AEncoding: TEncoding = nil): string; static;
    class procedure WriteTextFile(const AFileName: string; const AContent: string; AEncoding: TEncoding = nil); static;
    class function FileExists(const AFileName: string): Boolean; static;
    class function GetFileSize(const AFileName: string): Int64; static;
    class function GetFileExtension(const AFileName: string): string; static;
    class function GetFileNameWithoutExtension(const AFileName: string): string; static;
    class procedure EnsureDirectoryExists(const ADirPath: string); static;
    class function GetTempFileName(const AExtension: string = '.tmp'): string; static;
    class function GetAppDataPath: string; static;
  end;

  TJSONHelper = class
  public
    class function GetString(AJSON: TJSONObject; const AKey: string; const ADefault: string = ''): string; static;
    class function GetInteger(AJSON: TJSONObject; const AKey: string; const ADefault: Integer = 0): Integer; static;
    class function GetFloat(AJSON: TJSONObject; const AKey: string; const ADefault: Double = 0.0): Double; static;
    class function GetBoolean(AJSON: TJSONObject; const AKey: string; const ADefault: Boolean = False): Boolean; static;
    class function GetJSONObject(AJSON: TJSONObject; const AKey: string): TJSONObject; static;
    class function GetJSONArray(AJSON: TJSONObject; const AKey: string): TJSONArray; static;
    class function TryGetString(AJSON: TJSONObject; const AKey: string; out AValue: string): Boolean; static;
    class function TryGetInteger(AJSON: TJSONObject; const AKey: string; out AValue: Integer): Boolean; static;
    class function ObjectToString(AJSON: TJSONObject): string; static;
    class function StringToObject(const AJSONString: string): TJSONObject; static;
  end;

  TUIHelper = class
  public
    class procedure ShowMessage(const AMessage: string); static;
    class function ShowMessageOKCancel(const AMessage: string): Boolean; static;
    class procedure ShowError(const AMessage: string); static;
    class procedure ShowInfo(const AMessage: string); static;
    class procedure ShowWarning(const AMessage: string); static;
    class procedure SetControlEnabled(AControl: TControl; AEnabled: Boolean); static;
    class procedure SetControlsEnabled(AControls: array of TControl; AEnabled: Boolean); static;
    class procedure UpdateUI(AControl: TControl; AProc: TProc); static;
    class function GetScreenScale: Single; static;
  end;

implementation

{ TValidationResult }

procedure TValidationResult.Clear;
begin
  IsValid := True;
  ErrorMessage := '';
  ErrorField := '';
end;

class function TValidationResult.Success: TValidationResult;
begin
  Result.Clear;
end;

class function TValidationResult.Failure(const AErrorField, AErrorMessage: string): TValidationResult;
begin
  Result.IsValid := False;
  Result.ErrorField := AErrorField;
  Result.ErrorMessage := AErrorMessage;
end;

{ TValidator }

class function TValidator.IsEmpty(const AValue: string): Boolean;
begin
  Result := Trim(AValue) = '';
end;

class function TValidator.IsInteger(const AValue: string): Boolean;
var
  I: Integer;
begin
  Result := TryStrToInt(AValue, I);
end;

class function TValidator.IsFloat(const AValue: string): Boolean;
var
  F: Double;
begin
  Result := TryStrToFloat(AValue, F);
end;

class function TValidator.IsDateTime(const AValue: string): Boolean;
var
  DT: TDateTime;
begin
  Result := TryStrToDateTime(AValue, DT);
end;

class function TValidator.IsEmail(const AValue: string): Boolean;
var
  I, J: Integer;
begin
  Result := False;
  if IsEmpty(AValue) then Exit;
  I := Pos('@', AValue);
  if I = 0 then Exit;
  if Pos('.', Copy(AValue, I, Length(AValue))) = 0 then Exit;
  J := Length(AValue);
  if (I > 1) and (J > I) then
    Result := True;
end;

class function TValidator.IsPhone(const AValue: string): Boolean;
var
  S: string;
  I: Integer;
begin
  Result := False;
  S := '';
  for I := 1 to Length(AValue) do
  begin
    if AValue[I] in ['0'..'9', '+', '-', '(', ')'] then
      S := S + AValue[I];
  end;
  if Length(S) >= 7 then
    Result := True;
end;

class function TValidator.IsIPAddress(const AValue: string): Boolean;
var
  Parts: TArray<string>;
  I, Val: Integer;
begin
  Result := False;
  Parts := AValue.Split(['.']);
  if Length(Parts) <> 4 then Exit;
  for I := 0 to 3 do
  begin
    if not TryStrToInt(Parts[I], Val) then Exit;
    if (Val < 0) or (Val > 255) then Exit;
  end;
  Result := True;
end;

class function TValidator.MinLength(const AValue: string; AMinLen: Integer): Boolean;
begin
  Result := Length(AValue) >= AMinLen;
end;

class function TValidator.MaxLength(const AValue: string; AMaxLen: Integer): Boolean;
begin
  Result := Length(AValue) <= AMaxLen;
end;

class function TValidator.InRange(const AValue: string; AMin, AMax: Double): Boolean;
var
  F: Double;
begin
  Result := False;
  if not TryStrToFloat(AValue, F) then Exit;
  Result := (F >= AMin) and (F <= AMax);
end;

class function TValidator.ValidateBarcode(const ABarcode: string): TValidationResult;
begin
  Result := TValidationResult.Success;
  if IsEmpty(ABarcode) then
    Exit(TValidationResult.Failure('Barcode', 'Barcode cannot be empty'));
  if Length(ABarcode) < 8 then
    Exit(TValidationResult.Failure('Barcode', 'Barcode must be at least 8 characters'));
  if Length(ABarcode) > 50 then
    Exit(TValidationResult.Failure('Barcode', 'Barcode must not exceed 50 characters'));
end;

class function TValidator.ValidateLotNo(const ALotNo: string): TValidationResult;
begin
  Result := TValidationResult.Success;
  if IsEmpty(ALotNo) then
    Exit(TValidationResult.Failure('LotNo', 'Lot number cannot be empty'));
  if Length(ALotNo) < 6 then
    Exit(TValidationResult.Failure('LotNo', 'Lot number must be at least 6 characters'));
end;

class function TValidator.ValidateMaterialCode(const AMaterialCode: string): TValidationResult;
begin
  Result := TValidationResult.Success;
  if IsEmpty(AMaterialCode) then
    Exit(TValidationResult.Failure('MaterialCode', 'Material code cannot be empty'));
  if Length(AMaterialCode) < 3 then
    Exit(TValidationResult.Failure('MaterialCode', 'Material code must be at least 3 characters'));
end;

{ TStringHelperEx }

function TStringHelperEx.IsInteger: Boolean;
begin
  Result := TValidator.IsInteger(Self.ToString);
end;

function TStringHelperEx.IsFloat: Boolean;
begin
  Result := TValidator.IsFloat(Self.ToString);
end;

function TStringHelperEx.ToIntegerDef(ADefault: Integer): Integer;
begin
  if not TryStrToInt(Self.ToString, Result) then
    Result := ADefault;
end;

function TStringHelperEx.ToFloatDef(ADefault: Double): Double;
begin
  if not TryStrToFloat(Self.ToString, Result) then
    Result := ADefault;
end;

function TStringHelperEx.TrimLeft: string;
begin
  Result := System.StrUtils.TrimLeft(Self.ToString);
end;

function TStringHelperEx.TrimRight: string;
begin
  Result := System.StrUtils.TrimRight(Self.ToString);
end;

function TStringHelperEx.RemoveWhitespace: string;
var
  I: Integer;
begin
  Result := '';
  for I := 1 to Length(Self.ToString) do
  begin
    if not CharInSet(Self.ToString[I], [' ', #9, #10, #13]) then
      Result := Result + Self.ToString[I];
  end;
end;

function TStringHelperEx.Contains(const ASubStr: string): Boolean;
begin
  Result := Pos(ASubStr, Self.ToString) > 0;
end;

function TStringHelperEx.StartsWith(const AStr: string): Boolean;
begin
  Result := Copy(Self.ToString, 1, Length(AStr)) = AStr;
end;

function TStringHelperEx.EndsWith(const AStr: string): Boolean;
begin
  Result := Copy(Self.ToString, Length(Self.ToString) - Length(AStr) + 1, Length(AStr)) = AStr;
end;

function TStringHelperEx.ReplaceAll(const AFrom, ATo: string): string;
begin
  Result := System.StrUtils.ReplaceStr(Self.ToString, AFrom, ATo);
end;

{ TDateTimeHelper }

class function TDateTimeHelper.FormatDateTime(const AFormat: string; ADateTime: TDateTime): string;
begin
  Result := System.SysUtils.FormatDateTime(AFormat, ADateTime);
end;

class function TDateTimeHelper.ParseDateTime(const AValue: string): TDateTime;
begin
  if not TryStrToDateTime(AValue, Result) then
    Result := 0;
end;

class function TDateTimeHelper.GetDateOnly(ADateTime: TDateTime): TDate;
begin
  Result := Trunc(ADateTime);
end;

class function TDateTimeHelper.GetTimeOnly(ADateTime: TDateTime): TTime;
begin
  Result := ADateTime - Trunc(ADateTime);
end;

class function TDateTimeHelper.StartOfDay(ADateTime: TDateTime): TDateTime;
begin
  Result := Trunc(ADateTime);
end;

class function TDateTimeHelper.EndOfDay(ADateTime: TDateTime): TDateTime;
begin
  Result := Trunc(ADateTime) + 1 - OneSecond;
end;

class function TDateTimeHelper.GetAge(ABirthDate: TDateTime): Integer;
begin
  Result := YearOf(Now) - YearOf(ABirthDate);
  if (MonthOf(Now) < MonthOf(ABirthDate)) or
     ((MonthOf(Now) = MonthOf(ABirthDate)) and (DayOf(Now) < DayOf(ABirthDate))) then
    Dec(Result);
end;

class function TDateTimeHelper.IsToday(ADateTime: TDateTime): Boolean;
begin
  Result := IsSameDay(ADateTime, Now);
end;

class function TDateTimeHelper.IsSameDay(ADate1, ADate2: TDateTime): Boolean;
begin
  Result := (Trunc(ADate1) = Trunc(ADate2));
end;

{ TFileHelper }

class function TFileHelper.ReadTextFile(const AFileName: string; AEncoding: TEncoding = nil): string;
begin
  Result := '';
  if not FileExists(AFileName) then Exit;
  if AEncoding = nil then
    AEncoding := TEncoding.UTF8;
  Result := TFile.ReadAllText(AFileName, AEncoding);
end;

class procedure TFileHelper.WriteTextFile(const AFileName: string; const AContent: string; AEncoding: TEncoding = nil);
begin
  if AEncoding = nil then
    AEncoding := TEncoding.UTF8;
  EnsureDirectoryExists(ExtractFilePath(AFileName));
  TFile.WriteAllText(AFileName, AContent, AEncoding);
end;

class function TFileHelper.FileExists(const AFileName: string): Boolean;
begin
  Result := System.SysUtils.FileExists(AFileName);
end;

class function TFileHelper.GetFileSize(const AFileName: string): Int64;
var
  F: TFileStream;
begin
  Result := 0;
  if not FileExists(AFileName) then Exit;
  F := TFileStream.Create(AFileName, fmOpenRead or fmShareDenyNone);
  try
    Result := F.Size;
  finally
    F.Free;
  end;
end;

class function TFileHelper.GetFileExtension(const AFileName: string): string;
begin
  Result := System.SysUtils.ExtractFileExt(AFileName);
end;

class function TFileHelper.GetFileNameWithoutExtension(const AFileName: string): string;
begin
  Result := System.SysUtils.ChangeFileExt(System.SysUtils.ExtractFileName(AFileName), '');
end;

class procedure TFileHelper.EnsureDirectoryExists(const ADirPath: string);
begin
  if not DirectoryExists(ADirPath) then
    ForceDirectories(ADirPath);
end;

class function TFileHelper.GetTempFileName(const AExtension: string = '.tmp'): string;
var
  TempPath: string;
begin
  TempPath := System.SysUtils.GetTempPath;
  Result := TempPath + ChangeFileExt(System.SysUtils.ExtractFileName(ParamStr(0)), '') + '_' + IntToStr(GetCurrentThreadID) + AExtension;
end;

class function TFileHelper.GetAppDataPath: string;
begin
  Result := IncludeTrailingPathDelimiter(ExtractFilePath(ParamStr(0))) + 'Data\';
  EnsureDirectoryExists(Result);
end;

{ TJSONHelper }

class function TJSONHelper.GetString(AJSON: TJSONObject; const AKey: string; const ADefault: string = ''): string;
var
  Pair: TJSONPair;
begin
  Result := ADefault;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
    Result := Pair.JsonValue.Value;
end;

class function TJSONHelper.GetInteger(AJSON: TJSONObject; const AKey: string; const ADefault: Integer = 0): Integer;
var
  Pair: TJSONPair;
begin
  Result := ADefault;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
  begin
    if Pair.JsonValue is TJSONNumber then
      Result := TJSONNumber(Pair.JsonValue).AsInt
    else
      TryStrToInt(Pair.JsonValue.Value, Result);
  end;
end;

class function TJSONHelper.GetFloat(AJSON: TJSONObject; const AKey: string; const ADefault: Double = 0.0): Double;
var
  Pair: TJSONPair;
begin
  Result := ADefault;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
  begin
    if Pair.JsonValue is TJSONNumber then
      Result := TJSONNumber(Pair.JsonValue).AsDouble
    else
      TryStrToFloat(Pair.JsonValue.Value, Result);
  end;
end;

class function TJSONHelper.GetBoolean(AJSON: TJSONObject; const AKey: string; const ADefault: Boolean = False): Boolean;
var
  Pair: TJSONPair;
begin
  Result := ADefault;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
  begin
    if Pair.JsonValue is TJSONTrue then
      Result := True
    else if Pair.JsonValue is TJSONFalse then
      Result := False;
  end;
end;

class function TJSONHelper.GetJSONObject(AJSON: TJSONObject; const AKey: string): TJSONObject;
var
  Pair: TJSONPair;
begin
  Result := nil;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
    if Pair.JsonValue is TJSONObject then
      Result := TJSONObject(Pair.JsonValue);
end;

class function TJSONHelper.GetJSONArray(AJSON: TJSONObject; const AKey: string): TJSONArray;
var
  Pair: TJSONPair;
begin
  Result := nil;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
    if Pair.JsonValue is TJSONArray then
      Result := TJSONArray(Pair.JsonValue);
end;

class function TJSONHelper.TryGetString(AJSON: TJSONObject; const AKey: string; out AValue: string): Boolean;
var
  Pair: TJSONPair;
begin
  Result := False;
  AValue := '';
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
  begin
    AValue := Pair.JsonValue.Value;
    Result := True;
  end;
end;

class function TJSONHelper.TryGetInteger(AJSON: TJSONObject; const AKey: string; out AValue: Integer): Boolean;
var
  Pair: TJSONPair;
begin
  Result := False;
  AValue := 0;
  Pair := AJSON.GetValue(AKey);
  if Pair <> nil then
  begin
    if Pair.JsonValue is TJSONNumber then
    begin
      AValue := TJSONNumber(Pair.JsonValue).AsInt;
      Result := True;
    end
    else if TryStrToInt(Pair.JsonValue.Value, AValue) then
      Result := True;
  end;
end;

class function TJSONHelper.ObjectToString(AJSON: TJSONObject): string;
begin
  if AJSON <> nil then
    Result := AJSON.ToJSON
  else
    Result := '';
end;

class function TJSONHelper.StringToObject(const AJSONString: string): TJSONObject;
begin
  Result := nil;
  if AJSONString = '' then Exit;
  try
    Result := TJSONObject.ParseJSONValue(AJSONString) as TJSONObject;
  except
    Result := nil;
  end;
end;

{ TUIHelper }

class procedure TUIHelper.ShowMessage(const AMessage: string);
begin
  if not Application.Active then Exit;
  Application.MessageBox(AMessage, 'Information', MB_OK + MB_ICONINFORMATION);
end;

class function TUIHelper.ShowMessageOKCancel(const AMessage: string): Boolean;
begin
  Result := False;
  if not Application.Active then Exit;
  Result := Application.MessageBox(AMessage, 'Confirm', MB_OKCANCEL + MB_ICONQUESTION) = ID_OK;
end;

class procedure TUIHelper.ShowError(const AMessage: string);
begin
  if not Application.Active then Exit;
  Application.MessageBox(AMessage, 'Error', MB_OK + MB_ICONERROR);
end;

class procedure TUIHelper.ShowInfo(const AMessage: string);
begin
  ShowMessage(AMessage);
end;

class procedure TUIHelper.ShowWarning(const AMessage: string);
begin
  if not Application.Active then Exit;
  Application.MessageBox(AMessage, 'Warning', MB_OK + MB_ICONWARNING);
end;

class procedure TUIHelper.SetControlEnabled(AControl: TControl; AEnabled: Boolean);
begin
  if AControl = nil then Exit;
  AControl.Enabled := AEnabled;
end;

class procedure TUIHelper.SetControlsEnabled(AControls: array of TControl; AEnabled: Boolean);
var
  Ctrl: TControl;
begin
  for Ctrl in AControls do
    SetControlEnabled(Ctrl, AEnabled);
end;

class procedure TUIHelper.UpdateUI(AControl: TControl; AProc: TProc);
begin
  if AControl = nil then Exit;
  AControl.BeginUpdate;
  try
    AProc;
  finally
    AControl.EndUpdate;
  end;
end;

class function TUIHelper.GetScreenScale: Single;
begin
  if Application.MainForm <> nil then
    Result := Application.MainForm.CurrentPPI / 96.0
  else
    Result := 1.0;
end;

end.