Program Lab3_1;

Uses
    System.SysUtils;

type
    InputType = (FromConsole, FromFile);


Var
    Path: String;
    Sentence: String;
    Order: Integer;


function GetInputType(): InputType;
var
    Ret: InputType;
    Input: String;
    IsCorrect: Boolean;
begin
    IsCorrect := False;
    repeat
        Writeln('Выберите способ ввода предложения файл/консоль (ф/к)');
        Readln(Input);
        if (Input = 'ф') or (Input = 'Ф') or (Input = 'Файл') or (Input = 'файл')
        then
        begin
            Ret := InputType.FromFile;
            IsCorrect := True;
        end
        else if (Input = 'к') or (Input = 'К') or (Input = 'Консоль') or
          (Input = 'консоль') then
        begin
            Ret := InputType.FromConsole;
            IsCorrect := True;
        end;
    until IsCorrect;
    Result := Ret;
end;

function GetSentenceFromConsole(var Sentence:String): String;
begin
    Writeln('Введите исходное предложение');
    Readln(Sentence);
    Result := Sentence;
end;

Function GetFilePath(): String;
Var
    Path: String;
    IsCorrect: Boolean;
Begin
    Repeat
        Writeln('Введите абсолютный путь к файлу ');
        Readln(Path);
        IsCorrect := False;
        If FileExists(Path) then
        Begin
            Writeln('Файл успешно открыт');
            IsCorrect := true
        End
        Else
            Writeln('Файл не найден');

    Until IsCorrect;
    Result := Path;
End;

Function GetSentenceFromFile(Var Sentence:String): String;
Var
    SenFile: TextFile;
Begin
    Path := GetFilePath();
    AssignFile(SenFile, Path);
    Reset(SenFile);
    Read(SenFile, Sentence);
    CloseFile(SenFile);
    Result := Sentence;
End;

Procedure PrintSentenceBeforeEditing(Sentence: String);
Begin
    Writeln;
    Writeln('Исходное предложение: ');
    Write(Sentence);
    Writeln;
End;

function GetSentence(): String;
var
    SelectedInputType: InputType;
begin
    SelectedInputType := GetInputType();
    if (SelectedInputType = InputType.FromConsole) then
    begin
        Sentence := GetSentenceFromConsole(Sentence)
    end
    else if (SelectedInputType = InputType.FromFile) then
    begin
        Sentence := GetSentenceFromFile(Sentence);
    end;
    PrintSentenceBeforeEditing(Sentence);
    Result := Sentence;
end;

Function Output(): String;
Var
    Patho: String;
    IsCorrect: Boolean;
Begin
    IsCorrect := False;
    Repeat
        Writeln('Введите директорию, в которую хотите сохранить исправленное предложение');
        Readln(Patho);
        If DirectoryExists(Patho) then
            IsCorrect := True
        Else
            Writeln('Такой директории не существует. Попробуйте ещё раз');
    Until IsCorrect;
    Result := Patho;
End;

Procedure SaveSentenceToFile(Sentence: String);
Var
    I, J: Integer;
    OutputFile: TextFile;
    Directory: String;
Begin
    Directory := Output();
    AssignFile(OutputFile, Directory + '\output.txt');
    Rewrite(OutputFile);
    Write(OutputFile,Sentence);
    Writeln(OutputFile);
    Writeln('Результат сохранён по указанному пути');
    CloseFile(OutputFile);
    Write;
End;

Procedure PrintSentenceAfterEditing(Sentence: String);
Begin
    Writeln;
    Writeln('Исправленное предложение:');
    Writeln(Sentence);
    Writeln;
End;

Function Editing(Sentence: String): String;
Var
I:Integer;
Begin
    While Sentence[1]=' ' do
    Begin
        Delete(Sentence, 1, 1);
    End;
    While Pos('  ', Sentence) > 0 do
    Begin
        Delete(Sentence, Pos('  ', Sentence), 1);
    End;
    While Sentence[Length(Sentence)] = ' ' do
    Begin
         Delete(Sentence, Length(Sentence), 1);
    End;
    for I := 0 to Length(Sentence) do
    if ((Sentence[I] in [',', '.', '?', '!', ';', ':']) and (Sentence[I-1]=' ')) then
    Delete(Sentence, I-1, 1);
    Editing(Sentence);
Result := Sentence;
End;

Begin
    Sentence := GetSentence();
    Sentence := Editing(Sentence);
    SaveSentenceToFile(Sentence);
    Readln;
End.