lab3_1

Program lab3_1;

{$APPTYPE CONSOLE}

uses
  System.SysUtils;

type
    TString = array of string;

Function InputFileLocation(): string;
Var
    IsCorrect: Boolean;
    Location: String;
Begin
    Repeat
        IsCorrect := false;
        WriteLn('Enter file location:');
        ReadLn(Location);
        If FileExists(Location) then
            IsCorrect := true
        Else
        Begin
            WriteLn('Please enter the correct location');
            WriteLn('');
        End;
    Until IsCorrect;
    InputFileLocation := Location;
End;


Function ChooseInput(): integer;
Var
    Line: String;
    IsCorrect: Boolean;
Begin
    Repeat
        IsCorrect := true;
        WriteLn('Do you want to input from file? (y/n)');
        ReadLn(line);
        Line := Line.ToLower();
        If(Line <> '') and (Line <> 'y') and (Line <> 'n') then
        Begin
            IsCorrect := false;
            WriteLn('Enter valid answer');
        End;
    Until IsCorrect;
    If (Line = '') or (Line = 'y') then
        ChooseInput := 0
    Else
        ChooseInput := 1;
End;

Procedure GetLineFromFile(Str: String);
var
    IsCorrect: Boolean;
    TFile: TextFile;
begin
    repeat
        IsCorrect := true;
        AssignFile(TFile, InputFileLocation());
        Reset(TFile);
        ReadLn(TFile, Str);
        CloseFile(TFile);
        if (Length(Str) = 0) then
        begin
            WriteLn('One or both strings are empty. Enter another file location');
            IsCorrect := false;
        end;
    until IsCorrect;
end;

Procedure OutputToFile(WordPosition: Integer);
Var
    TxtFile: TextFile;
Begin
    AssignFile(TxtFile, InputFileLocation());
    Rewrite(TxtFile);
    Writeln(TxtFile, WordPosition);
End;

Function GetLineFromConsole(): String;
var
    IsCorrect: Boolean;
    InputLine: String;
begin
     repeat
        IsCorrect := true;
        ReadLn(InputLine);
        if Length(InputLine) = 0 then
        begin
            WriteLn('The line is empty, re-enter please');
            IsCorrect := false;
        end;
    until IsCorrect;
    GetLineFromConsole := InputLine;
end;

Function FindAmountOfWordsInSentence(Str: String): Integer;
Var
    Amount, I: Integer;
Begin
    Amount := 1;
    for I := 1 to High(Str) do
        if Str[I] = ' ' then
            Inc(Amount);
    FindAmountOfWordsInSentence := Amount;
End;

Function FindWords(Str: String; Amount: Integer): TString;
Var
    Words: TString;
    I, J: Integer;
Begin
    J := 1;
    SetLength(Words, Amount);
    for I := 0 to Amount - 1 do
    Begin
        while (Str[J] <> ' ') and (J <= length(Str) ) do
        Begin
            Words[I] := Words[I] + Str[J];
            Inc(J);
        End;
        Inc(J);
    End;
    FindWords := Words;
End;

Function FindShortestWord(Amount: Integer; Words: TString): Integer;
Var
    I, MinLength, Pos: Integer;
Begin
    MinLength := Length(Words[0]);
    for I := 0 to Amount - 1 do
        if MinLength > Length(Words[I]) then
        Begin
            MinLength := Length(Words[I]);
            Pos := I;
        End;
    FindShortestWord := Pos;
End;

Function FindPosition(Words: TString; Pos: Integer ):Integer;
Var
    I, WordPosition: Integer;
Begin
    Wordposition := 0;
    for I := 0 to (Pos - 1) do
        WordPosition := WordPosition + Length(Words[I]);
    WordPosition := WordPosition + I + 1;
    FindPosition := WordPosition;
End;

Procedure Main();
Var
    ChosenInput, Amount, WordPosition, Pos: Integer;
    Str,  ShortestWord: String;
    Words : TString;
Begin
    WriteLn('Программа находит самое короткое слово в предложении и указывает позицию , с которой оно начинается.');
    ChosenInput := ChooseInput();
    If (ChosenInput = 0) then
        GetLineFromFile(Str)
    Else
    Begin
        Writeln('Введите предложение');
        Str := GetLineFromConsole();
    End;
    Amount := FindAmountOfWordsInSentence(Str);
    Words := FindWords(Str, Amount);
    Pos := FindShortestWord(Amount, Words);
    writeln('Позиция самого короткого слова предложения');
    WordPosition := FindPosition(Words, Pos);
    Writeln(WordPosition);
    WriteLn;
    OutputToFile(WordPosition);
    ReadLn;
End;

Begin
    Main();
End.