Battleships

You have to write an application for playing ships over the network.

The application connects to another application, and plays the game of the ship.

Startup parameters

The application supports the following parameters:

• -mode [server|client] - indicates the mode of operation (as a server - accepts the connection, as a client - establishes a connection to the server)
• -port N - the port which the application uses to communicate.
• -map map-file - path to the file containing the map with the ship layout (format described in the Map section).

Map

• The map is a 10x10 chart, containing a description of the position of the ships.
• . means water, # means ship.
• Rows are marked with numbers from 1 to 10 (top to bottom), columns with letters A to J (left to right).
• The sheet should contain:
  • 4 ships of size 1,
  • 3 ships of size 2,
  • 2 ships of size 3,
  • 1 ship size 4.
• Ships of size 3-4 can be "broken", but the individual segments must connect with at least one side.
• Two ships cannot contact each other (also diagonally).

Example map below:

..#.......
#......#..
#..#......
..##......
......##..
.##.......
.........#
..##...#..
.##....#.#
.......#..

Explanation: on this map, the 1-mast ships are in position: C1, H2, J7 and J9.

Communication protocol

• Communication is done using TCP protocol, with UTF-8 encoding.
• The client and the server alternately send each other a message, which consists of 2 parts: commands and coordinates, separated by a ; character, and terminated by an end of line character \n.
  • The message format: command;coordinates\n.
  • Example of a message: pudło;D6\n.
• Commands and their meaning:
  • start
    • command to initiate the game.
    • The client sends it only once, at the beginning.
    • Example: start;A1\n.
  • pudło
    • answer sent when there is no ship under the coordinates provided by the other side.
    • Example: pudło;A1\n.
  • trafiony
    • the message sent when there is a ship under the coordinates provided from the other side, and this is not its last missed segment so far.
    • Example: trafiony;A1\n.
  • trafiony zatopiony
    • the story sent when there is a ship under the coordinates received from the other side, and the last missed segment of that ship was hit.
    • Example: trafiony zatopiony;A1\n.
  • ostatni zatopiony
    • the story sent when there is a ship at the coordinates received from the other side, and the last missed ship segment of the entire fleet in this game was hit.
    • This is the last command in the game. The sending side loses it.
    • This command does not give the coordinates of the shot (there is no one to shoot anymore!).
    • Example: ostatni zatopiony\n.
• It is possible (although strategically unreasonable) to shoot multiple times in the same place. You should then respond according to the current state of the board:
  • pudło in case of a box,
  • trafionywhen the ship was already hit, but is not yet sunk,
  • trafiony zatopiony when the ship is already sunk.
• Error handling:
  • If you receive an incomprehensible command or after 1 second of waiting, you must resend your last message.
  • After 3 unsuccessful attempts, you should display the message Błąd komunikacji and terminate the application.

Application Operation

• When started (in any mode), the application should display its map.
• During operation, the application should display all sent and received messages.
• After the game, the application should display:
  • Wygrana\n in case of a win, or Przegrana\n in case of a loss,
  • In case of a win - full map of the opponent,
  • In case of a loss, the map of the opponent, with the replacement of unknown fields with the ? character. Note: the fields adjacent to the sunken ship are to be considered uncovered (there must be no other ship on them).
  • Blank line
  • Your map, with additional markings: ~ - the opponent's boxes, @ - the opponent's targeted shots.

An example of an opponent's map from a lost session:

..#..??.?.
#.????.#..
#....??...
..##....?.
?.....##..
??#??.....
..?......#
..##...#..
.##....#.#
.......#..

An example of your map after the game (winning - not all sunken ships):

~~@~~.~~~.
@..~.~.@.~
#.~#..~.~.
..##..~..~
..~.~.@@..
.#@~..~...
.~.~.~.~.@
~.##.~.#~~
.##~..~~~~
..~.~.~~~.