program login;

uses
  md5, crt;

type
  CONNECTION = record
    hotel : string;
    distance : integer;
  end;

  HOTEL = record
    name : string;
    conn : CONNECTION;
  end;

  USER = record
    un: string;
    pw: string;
    l: boolean;
  end;

const
users: array [0..4] of USER = (
  (un: 'user1'; pw: '16d7a4fca7442dda3ad93c9a726597e4'; l: false),
  (un: 'user2'; pw: 'ccd2fc33d2d423d7209035dbfff82b29'; l: false),
  (un: 'user3'; pw: '57c2877c1d84c4b49f3289657deca65c'; l: false),
  (un: 'user4'; pw: '4101bef8794fed986e95dfb54850c68b'; l: false),
  (un: 'root';  pw: '63a9f0ea7bb98050796b649e85481845'; l: false)
  );
hotels: array [0..4] of HOTEL = (
  (name: 'Hotel 1'; conn: (hotel: 'Hotel 2'; distance: 11)),
  (name: 'Hotel 2'; conn: (hotel: 'Hotel 3'; distance: 5)),
  (name: 'Hotel 3'; conn: (hotel: 'Hotel 4'; distance: 11)),
  (name: 'Hotel 4'; conn: (hotel: 'Hotel 5'; distance: 5)),
  (name: 'Hotel 5'; conn: (hotel: ''; distance: 0))
);

var
  readinput: string;
  i, j, distance_total, hnum1, hnum2: integer;
  correct, exit: boolean;
  usersuccess: boolean = false;
  velocity, time: real;

{ Calculates the total distance between hotels based on the hotel number input.
  (Only numbers accepted!). After printing the total distance a velocity can be
  input to calculate the estimated time. }
procedure hotelmain;
var
  i : integer;
begin
  while exit = false do
  begin
    distance_total := 0;
    for i := 0 to 4 do
    begin
      distance_total += hotels[i].conn.distance
    end;
    Writeln('Total tour length: ', distance_total, ' km');
    Write('First Hotel Number: ');
    ReadLn(hnum1);
    Writeln;
    Write('Second Hotel Number: ');
    ReadLn(hnum2);

    If ((hnum1 <= 5) and (hnum2 <= 5)) then
    begin
      distance_total := 0;
      if (hnum1 > hnum2) then
        for i := (hnum1-2) downto (hnum2-1) do
          distance_total := distance_total + hotels[i].conn.distance
      else
        for i := (hnum1-1) to (hnum2-2) do
          distance_total := distance_total + hotels[i].conn.distance;
      Writeln('Distance between hotels is ', distance_total);
      Write('Velocity (km/h): ');
      ReadLn(velocity);
      time := (distance_total / velocity);
      WriteLn('Estimated Time: ', time: 10: 2, ' hours');
    end;
    Write('Exit? (y/n)');
    ReadLn(readinput);

    if readinput = 'y' then
      exit := true
    else
      exit := false;
  end;
end;

begin
  TextColor(8);
  Writeln('Tourplanner');
  Writeln('Written by J.Riegel.');
  TextColor(White);

  { endless loop/main loop of the program. Exit with CTRL-C }
  while true do
  begin
    Write('User: ');
    ReadLn(readinput);
    usersuccess := false;

    { Iterate over all 5 user entries to find the one
      that fits the input. set usersuccess to true if found
      else it remains false and an user not found error
      is printed to the console. }

    for i := 0 to 4 do
      if readinput = users[i].un then
      begin
        usersuccess := true;
        if (users[i].l) then
        begin
          TextColor(Red);
          Writeln('This user is locked.');
          TextColor(White);
          Break;
        end;

        { 3 tries for password input. Return to the username
          input after failure. correct is set to true if
          the loggin was a success. }

        for j := 0 to 2 do
        begin
          WriteLn('Password: ');
          ReadLn(readinput);

          if MD5Print(MD5String(readinput)) = users[i].pw then
          begin
            WriteLn('Login Successful!');
            correct := true;
            Break;
          end
          else
            WriteLn('Wrong password! ', 2 - j, ' trys left.');
        end;
        { @section userfunctions }
        if correct = true then
          hotelmain()
        else
          users[i].l := true;
      end;
    if usersuccess = false then
      WriteLn('User not found');
  end;
end.