unit Base;

interface

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

type
  TBaseForm = class(TForm)
    Data: TStringGrid;
    MainMenu1: TMainMenu;
    About: TMenuItem;
    Update: TMenuItem;
    Find: TButton;
    Ans: TMemo;
    procedure FormCreate(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure UpdateClick(Sender: TObject);
    procedure FormShow(Sender: TObject);
    procedure AboutClick(Sender: TObject);
    procedure FindClick(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  BaseForm: TBaseForm;

implementation

Uses
   Menu, ChangeMenu, Add, DeleteRef, Change;

{$R *.dfm}

procedure TBaseForm.FindClick(Sender: TObject);
var
   a, b: array of TRef;
   i, k, j, l, r: Integer;
   s, sDay, sMonth: String;
   Day, Month: array of Byte;
   TempDay, TempMonth: Byte;
   Temp: TRef;
begin
   for i := 0 to n - 1 do
   begin
      s := Ref[i].Date;
      k := 2;
      while k > 0 do
      begin
         if s[1] = '.' then
            Dec(k);
         delete(s, 1, 1);
      end;
      if s = '2021' then
      begin
         SetLength(a, Length(a) + 1);
         a[High(a)] := Ref[i];
      end;
   end;

   for i := 0 to High(a) do
      if a[i].Str <= 20 then
      begin
         SetLength(b, Length(b) + 1);
         SetLength(Day, Length(Day) + 1);
         SetLength(Month, Length(Month) + 1);
         b[High(b)] := a[i];
         s := a[i].Date;
         k := 2;
         sDay := '';
         sMonth := '';
         while k > 0 do
         begin
            if s[1] = '.' then
               Dec(k)
            else
               if k = 2 then
                  sDay := sDay + s[1]
               else
                  SMonth := sMonth + s[1];
            delete(s, 1, 1);
         end;
         Day[High(Day)] := StrToInt(sDay);
         Month[High(Month)] := StrToInt(sMonth);
      end;

   for i := 0 to High(b) - 1 do
      for j := i to High(b) - i do
         if Month[i] > Month[j] then
         begin
            Temp := b[i];
            b[i] := b[j];
            b[j] := Temp;
            TempDay := Day[i];
            Day[i] := Day[j];
            Day[j] := TempDay;
            TempMonth := Month[i];
            Month[i] := Month[j];
            Month[j] := TempMonth;
         end;

   l := 0;
   r := 0;
   while l <= High(b) do
   begin
      while (Month[l] = Month[r]) and (r < Length(b)) do
         Inc(r);
      Dec(r);
      for i := l to r - 1 do
         for j := i to r - i do
            if Day[i] > Day[j] then
            begin
               Temp := b[i];
               b[i] := b[j];
               b[j] := Temp;
               TempDay := Day[i];
               Day[i] := Day[j];
               Day[j] := TempDay;
               TempMonth := Month[i];
               Month[i] := Month[j];
               Month[j] := TempMonth;
            end;
      Inc(r);
      l := r;
   end;

   Ans.Lines.Clear;
   for i := 0 to High(b) do
   begin
      s := b[i].Topic;
      s := s + ' ' + b[i].Author;
      s := s + ' ' + IntToStr(b[i].Str);
      s := s + ' ' + b[i].Date;
      Ans.Lines.Add(s);
   end;
   ShowMessage(Ans.Text);
end;

procedure TBaseForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
   CanClose := MessageDlg('Вы уверены, что хотите выйти из программы?' +
      #10#13 + 'Все несохраненные данные будут утеряны.',
      mtConfirmation, [mbYes, mbNo], 0) = mrYes;
   MenuForm.Close;
   ChangeMenuForm.Close;
   AddForm.Close;
   DeleteForm.Close;
   ChangeForm.Close;
end;

procedure TBaseForm.FormCreate(Sender: TObject);
begin
   Data.Cells[0, 0] := 'Тема';
   Data.Cells[1, 0] := 'Фамилия';
   Data.Cells[2, 0] := 'Кол-во страниц';
   Data.Cells[3, 0] := 'Дата страниц';
end;

procedure TBaseForm.FormShow(Sender: TObject);
var
   i: Integer;
begin
   Data.RowCount := n + 1;
   for i := 0 to n - 1 do
   begin
      Data.Cells[0, i + 1] := Ref[i].Topic;
      Data.Cells[1, i + 1] := Ref[i].Author;
      Data.Cells[2, i + 1] := IntToStr(Ref[i].Str);
      Data.Cells[3, i + 1] := Ref[i].Date;
   end;
   if n <> 0 then
      Data.Rows[n + 1].Clear
   else
      Data.Rows[1].Clear;
end;

procedure TBaseForm.AboutClick(Sender: TObject);
var
   Info: String;
begin
   Info := 'База данных о рефератах с возможностью редактирования' + #10#13 +
   'Кнопка "Найти" показывает ведения о рефератах, написанных в текущем году с количеством страниц не более 20 в порядке дат написания '
   + #10#13 + 'Автор - Пестунов Илья, гр. 051007';
   MessageDlg(Info, mtInformation, [mbOK], 0);
end;

procedure TBaseForm.UpdateClick(Sender: TObject);
var
   i: Integer;
begin
   BaseForm.Hide;
   ChangeMenuForm.Show;
end;

end.