Lab.4.2

unit Lab_4_2_Form;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.Menus, Vcl.StdCtrls;

type
  TForm_4_2 = class(TForm)
    MainMenu1: TMainMenu;
    NFile: TMenuItem;
    NOpenFile: TMenuItem;
    NSaveFile: TMenuItem;
    NInstruction: TMenuItem;
    NAbout: TMenuItem;
    LabelTask: TLabel;
    LabelDeleteOperation: TLabel;
    LabelInsertOperation: TLabel;
    LabelChangeOperation: TLabel;
    ButtonOpenTask: TButton;
    EditDeleteOperation: TEdit;
    EditInsertOperation: TEdit;
    EditChangeOperation: TEdit;
    ButtonFindPrice: TButton;
    LabelFinalPrice: TLabel;
    EditFinalPrice: TEdit;
    OpenDialog1: TOpenDialog;
    SaveDialog1: TSaveDialog;
    LabelSourceString: TLabel;
    EditSourceString: TEdit;
    EditDesiredString: TEdit;
    LabelDesiredString: TLabel;
    procedure NAboutClick(Sender: TObject);
    procedure ButtonOpenTaskClick(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure EditDeleteOperationKeyPress(Sender: TObject; var Key: Char);
    procedure EditInsertOperationKeyPress(Sender: TObject; var Key: Char);
    procedure EditChangeOperationKeyPress(Sender: TObject; var Key: Char);
    procedure NInstructionClick(Sender: TObject);
    procedure EditDeleteOperationChange(Sender: TObject);
    procedure EditInsertOperationChange(Sender: TObject);
    procedure EditChangeOperationChange(Sender: TObject);
    procedure EditSourceStringChange(Sender: TObject);
    procedure EditDesiredStringChange(Sender: TObject);
    procedure ButtonFindPriceClick(Sender: TObject);
    procedure NOpenFileClick(Sender: TObject);
    procedure NSaveFileClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form_4_2: TForm_4_2;

implementation

{$R *.dfm}

uses UnitAbout, UnitError, UnitExit, UnitInstruction_4_2, UnitTask_4_2;

const
    MAX_VALUE =  1000;
    MIN_VALUE = 0;
    MAX_STR = 200;
    MIN_STR = 1;

function DelAndInsert(X, Y: String; I, CostDel, CostIns, Count: Integer; var Price: Integer): Integer;
begin
    if I <= Count then
    begin
        Delete(X, I, 1);
        Insert(Y[I], X, I);
        Price := CostDel + CostIns + DelAndInsert(X, Y, (I + 1), CostDel, CostIns, Count, Price);
    end;
    DelAndInsert := Price;
end;

function ChangeElement(var X, Y: String; I, CostCh, Count: Integer; var Price: Integer): Integer;
begin
    if I <= Count then
    begin
        X[I] := Y[I];
        Price := CostCh + ChangeElement(X, Y, (I + 1), CostCh, Count, Price);
    end;
    ChangeElement := Price;
end;

function FindInterimPrice(X, Y: String; CostDelete, CostInsert, CostChange, Count: Integer): Integer;
var
    I, Answer: Integer;
begin
    Answer := 0;
    if ((CostDelete + CostInsert) < CostChange) then
        FindInterimPrice := DelAndInsert(X, Y, 1, CostDelete, CostInsert, Count, Answer)
    else
        FindInterimPrice := ChangeElement(X, Y, 1, CostChange, Count, Answer);
end;

procedure TForm_4_2.ButtonFindPriceClick(Sender: TObject);
var
    X, Y: String[200];
    CostInsert, CostDelete, CostChange, Count, FinalPrice: Integer;
    IsCorrect: Boolean;
    Error: String;
begin
    //EditFinalPrice.Text := IntToStr(FindInterimPrice(X, Y, CostDelete, CostInsert, CostChange, Count));
    IsCorrect := true;
    Error := '';
    FinalPrice := 0;
    Try
        CostDelete := StrToInt(EditDeleteOperation.Text);
        if (CostDelete > MAX_VALUE) or (CostDelete < MIN_VALUE) then
        begin
            IsCorrect := false;
            Error := 'Цена удаления элемента не входит в допустимый диапазон. ';
        end;
        CostInsert := StrToInt(EditInsertOperation.Text);
        if (CostInsert > MAX_VALUE) or (CostInsert < MIN_VALUE) then
        begin
            IsCorrect := false;
            Error := Error + 'Цена вставки элемента не входит в допустимый диапазон. ';
        end;
        CostChange := StrToInt(EditChangeOperation.Text);
        if (CostChange > MAX_VALUE) or (CostChange < MIN_VALUE) then
        begin
            IsCorrect := false;
            Error := Error + 'Цена замены элемента не входит в допустимый диапазон. ';
        end;
        X := EditSourceString.Text;
        if (Length(X) > MAX_STR) or (Length(X) < MIN_STR) then
        begin
            IsCorrect := false;
            Error := 'Длина исходной строки не входит в допустимый диапазон. ';
        end;
        Y := EditDesiredString.Text;
        if (Length(Y) > MAX_STR) or (Length(Y) < MIN_STR) then
        begin
            IsCorrect := false;
            Error := 'Длина желаемой строки не входит в допустимый диапазон. ';
        end;
    Except
        IsCorrect := false;
        Error := Error + 'Некорректно введено одно из значений цены. ';
    End;
    if (IsCorrect) then
    begin
        if (Length(X) = Length(Y)) then
        begin
            Count := Length(Y);
            FinalPrice :=  FindInterimPrice(X, Y, CostDelete, CostInsert, CostChange, Count);
        end
        else
        begin
            if Length(X) < (Length(Y)) then
            begin
                Count := Length(X);
                FinalPrice := FindInterimPrice(X, Y, CostDelete, CostInsert, CostChange, Count);
                FinalPrice := FinalPrice + CostInsert * (Length(Y) - Length(X));
            end
            else
            begin
                Count := Length(Y);
                FinalPrice := FindInterimPrice(X, Y, CostDelete, CostInsert, CostChange, Count);
                FinalPrice := FinalPrice + CostDelete * (Length(X) - Length(Y));
            end;
        end;
        EditFinalPrice.Text := IntToStr(FinalPrice);
        NSaveFile.Enabled := true;
    end
    else
    begin
        UnitError.FormError.LabelError.Caption := 'Ошибка! ' + Error;
        UnitError.FormError.ShowModal();
        UnitError.FormError.LabelError.Caption := '';
    end;
end;

procedure TForm_4_2.ButtonOpenTaskClick(Sender: TObject);
begin
    UnitTask_4_2.FormTask_4_2.ShowModal();
end;

procedure TForm_4_2.EditChangeOperationChange(Sender: TObject);
begin
    if (EditDeleteOperation.Text = '') or (EditInsertOperation.Text = '')
    or (EditSourceString.Text = '') or (EditDesiredString.Text = '')
    or (EditChangeOperation.Text = '') then
        ButtonFindPrice.Enabled := false
    else
        ButtonFindPrice.Enabled := true;
    EditFinalPrice.Text := '';
end;

procedure TForm_4_2.EditChangeOperationKeyPress(Sender: TObject; var Key: Char);
begin
    if not(Key in [#8, #13, '0'..'9']) then
        Key := #0;
    if (Length(EditChangeOperation.Text) = 0) and (Key in [#13, '0']) then
        Key := #0;
    if (Length(EditChangeOperation.Text) = 1) and not(EditChangeOperation.Text[1] = '1') then
        EditChangeOperation.MaxLength := 3;
    if (Length(EditChangeOperation.Text) = 3) and not(EditChangeOperation.Text = '100') then
        EditChangeOperation.MaxLength := 3
    else
        EditChangeOperation.MaxLength := 4;
    if (Length(EditChangeOperation.Text) = 3) and (EditChangeOperation.Text = '100') and not(Length(EditChangeOperation.SelText) > 0) and not(Key in ['0', #8, #13]) then
        Key := #0;
    if (Length(EditChangeOperation.SelText) > 0) and (Key = '0') then
        Key := #0;
    //if (Length(EditChangeOperation.Text) > 0) and (Key = #13) then
    //    ButtonFindAnswerClick(Sender);
end;

procedure TForm_4_2.EditDeleteOperationChange(Sender: TObject);
begin
    if (EditInsertOperation.Text = '') or (EditChangeOperation.Text = '')
    or (EditSourceString.Text = '') or (EditDesiredString.Text = '')
    or (EditDeleteOperation.Text = '') then
        ButtonFindPrice.Enabled := false
    else
        ButtonFindPrice.Enabled := true;
    EditFinalPrice.Text := '';
end;

procedure TForm_4_2.EditDeleteOperationKeyPress(Sender: TObject; var Key: Char);
begin
    if not(Key in [#8, #13, '0'..'9']) then
        Key := #0;
    if (Length(EditDeleteOperation.Text) = 0) and (Key in [#13, '0']) then
        Key := #0;
    if (Length(EditDeleteOperation.Text) = 1) and not(EditDeleteOperation.Text[1] = '1') then
        EditDeleteOperation.MaxLength := 3;
    if (Length(EditDeleteOperation.Text) = 3) and not(EditDeleteOperation.Text = '100') then
        EditDeleteOperation.MaxLength := 3
    else
        EditDeleteOperation.MaxLength := 4;
    if (Length(EditDeleteOperation.Text) = 3) and (EditDeleteOperation.Text = '100') and not(Length(EditDeleteOperation.SelText) > 0) and not(Key in ['0', #8, #13]) then
        Key := #0;
    if (Length(EditDeleteOperation.SelText) > 0) and (Key = '0') then
        Key := #0;
    //if (Length(EditDeleteOperation.Text) > 0) and (Key = #13) then
    //    ButtonFindPrice(Sender);
end;

procedure TForm_4_2.EditDesiredStringChange(Sender: TObject);
begin
    if (EditDeleteOperation.Text = '') or (EditInsertOperation.Text = '')
    or (EditChangeOperation.Text = '') or (EditSourceString.Text = '')
    or (EditDesiredString.Text = '') then
        ButtonFindPrice.Enabled := false
    else
        ButtonFindPrice.Enabled := true;
    EditFinalPrice.Text := '';
end;

procedure TForm_4_2.EditInsertOperationChange(Sender: TObject);
begin
    if (EditDeleteOperation.Text = '') or (EditChangeOperation.Text = '')
    or (EditSourceString.Text = '') or (EditDesiredString.Text = '')
    or (EditInsertOperation.Text = '') then
        ButtonFindPrice.Enabled := false
    else
        ButtonFindPrice.Enabled := true;
    EditFinalPrice.Text := '';
end;

procedure TForm_4_2.EditInsertOperationKeyPress(Sender: TObject; var Key: Char);
begin
    if not(Key in [#8, #13, '0'..'9']) then
        Key := #0;
    if (Length(EditInsertOperation.Text) = 0) and (Key in [#13, '0']) then
        Key := #0;
    if (Length(EditInsertOperation.Text) = 1) and not(EditInsertOperation.Text[1] = '1') then
        EditInsertOperation.MaxLength := 3;
    if (Length(EditInsertOperation.Text) = 3) and not(EditInsertOperation.Text = '100') then
        EditInsertOperation.MaxLength := 3
    else
        EditInsertOperation.MaxLength := 4;
    if (Length(EditInsertOperation.Text) = 3) and (EditInsertOperation.Text = '100') and not(Length(EditInsertOperation.SelText) > 0) and not(Key in ['0', #8, #13]) then
        Key := #0;
    if (Length(EditInsertOperation.SelText) > 0) and (Key = '0') then
        Key := #0;
    //if (Length(EditInsertOperation.Text) > 0) and (Key = #13) then
    //    ButtonFindAnswerClick(Sender);
end;

procedure TForm_4_2.EditSourceStringChange(Sender: TObject);
begin
    if (EditDeleteOperation.Text = '') or (EditInsertOperation.Text = '')
    or (EditChangeOperation.Text = '') or (EditDesiredString.Text = '')
    or (EditSourceString.Text = '') then
        ButtonFindPrice.Enabled := false
    else
        ButtonFindPrice.Enabled := true;
    EditFinalPrice.Text := '';
end;

procedure TForm_4_2.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
Var
    Res: Integer;
begin
    Res := UnitExit.FormExit.ShowModal();
    If Res = mrOk Then
        CanClose := True
    Else
        CanClose := False;
end;

procedure TForm_4_2.NAboutClick(Sender: TObject);
begin
    UnitAbout.FormAbout.ShowModal();
end;

procedure TForm_4_2.NInstructionClick(Sender: TObject);
begin
    UnitInstruction_4_2.FormInstruction.ShowModal();
end;

procedure TForm_4_2.NOpenFileClick(Sender: TObject);
var
    F: TextFile;
    Path, Error, SourceStr, DesiredStr: String;
    CostDelete, CostInsert, CostChange: Integer;
    IsCorrect: Boolean;
begin
    IsCorrect := true;
    Error := '';
    if OpenDialog1.Execute() then
    begin
        Path := OpenDialog1.FileName;
        AssignFile(F, Path);
        try
            Reset(F);
            try
                Readln(F, CostDelete);
                if (CostDelete < MIN_VALUE) or (CostDelete > MAX_VALUE) then
                begin
                    IsCorrect := false;
                    Error := Error + 'Значение цены удаления элемента не входит в допустимый диапазон. ';
                end;
                if EoF(F) then
                begin
                    IsCorrect := false;
                    Error := 'В файле недостаточно элементов. ';
                end
                else
                    Readln(F, CostInsert);
                if (CostInsert < MIN_VALUE) or (CostInsert > MAX_VALUE) then
                begin
                    IsCorrect := false;
                    Error := Error + 'Значение цены вставки элемента не входит в допустимый диапазон. ';
                end;
                if EoF(F) then
                begin
                    IsCorrect := false;
                    Error := 'В файле недостаточно элементов. ';
                end
                else
                    Readln(F, CostChange);
                if (CostChange < MIN_VALUE) or (CostChange > MAX_VALUE) then
                begin
                    IsCorrect := false;
                    Error := Error + 'Значение цены замены элемента не входит в допустимый диапазон. ';
                end;
                if EoF(F) then
                begin
                    IsCorrect := false;
                    Error := 'В файле недостаточно элементов. ';
                end
                else
                    Readln(F, SourceStr);
                if (length(SourceStr) < MIN_STR) or (length(SourceStr) > MAX_STR) then
                begin
                    IsCorrect := false;
                    Error := Error + 'Длина исходной строки не входит в диапазон допустимых значений. ';
                end;
                if EoF(F) then
                begin
                    IsCorrect := false;
                    Error := 'В файле недостаточно элементов. ';
                end
                else
                    Readln(F, DesiredStr);
                if (length(DesiredStr) < MIN_STR) or (length(DesiredStr) > MAX_STR) then
                begin
                    IsCorrect := false;
                    Error := Error + 'Длина желаемой строки не входит в диапазон допустимых значений. ';
                end;
                if not(EoF(F)) then
                begin
                    IsCorrect := false;
                    Error := 'В файле найдены лишние элементы. ';
                end;
            except
                IsCorrect := false;
                Error := 'Найдено некорректное значение в файле. ';
            end;
            CloseFile(F);
        except
            IsCorrect := False;
            Error := Error + 'Нет доступа к файлу';
        end;
    end;
    if not(IsCorrect) then
    begin
        UnitError.FormError.LabelError.Caption := 'Ошибка считывания с файла. ' + Error;
        UnitError.FormError.ShowModal();
        UnitError.FormError.LabelError.Caption := '';
    end
    else
    begin
        EditDeleteOperation.Text := IntToStr(CostDelete);
        EditInsertOperation.Text := IntToStr(CostInsert);
        EditChangeOperation.Text := IntToStr(CostChange);
        EditSourceString.Text := SourceStr;
        EditDesiredString.Text := DesiredStr;
    end;
end;

procedure TForm_4_2.NSaveFileClick(Sender: TObject);
var
    SaveFile: TextFile;
    SavePath, Error: String;
    Answer: Integer;
    IsCorrect: Boolean;
begin
    IsCorrect := True;
    Error := '';
    if SaveDialog1.Execute() then
    begin
        SavePath := SaveDialog1.FileName;
        AssignFile(SaveFile, SavePath);
        Try
            Rewrite(SaveFile);
            Try
                Writeln(SaveFile, 'Полученная стоимость: ', EditFinalPrice.Text);
            Finally
                CloseFile(SaveFile);
            End;
        Except
            IsCorrect := False;
            Error := 'Нет доступа к файлу';
        End;
        if not(IsCorrect) then
        begin
            UnitError.FormError.LabelError.Caption := 'Ошибка считывания с файла. ' + Error;
            UnitError.FormError.ShowModal();
            UnitError.FormError.LabelError.Caption := '';
        end
        else
            NSaveFile.Enabled := false;
    end;
end;

end.