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RuleBgGulbara.js
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RuleBgGulbara.js
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var model = require('../model.js');
var Rule = require('./rule.js');
/**
* One of the less popular variants of backgammon in Bulgaria (гюлбара).
* @constructor
* @extends Rule
*/
function RuleBgGulbara() {
Rule.call(this);
/**
* Rule name, matching the class name (eg. 'RuleBgGulbara')
* @type {string}
*/
this.name = 'RuleBgGulbara';
/**
* Short title describing rule specifics
* @type {string}
*/
this.title = 'Gul bara';
/**
* Full description of rule
* @type {string}
*/
this.description = 'One of the less popular variants of backgammon in Bulgaria.';
/**
* Full name of country where this rule (variant) is played.
* To list multiple countries use a pipe ('|') character as separator.
* @type {string}
*/
this.country = 'Bulgaria';
/**
* Two character ISO code of country where this rule (variant) is played.
* To list multiple codes use a pipe ('|') character as separator.
* List codes in same order as countries in the field above.
* @type {string}
*/
this.countryCode = 'bg';
/**
* Descendents should list all action types that are allowed in this rule.
* @type {MoveActionType[]}
*/
this.allowedActions = [
model.MoveActionType.MOVE,
model.MoveActionType.BEAR
];
}
RuleBgGulbara.prototype = Object.create(Rule.prototype);
RuleBgGulbara.prototype.constructor = RuleBgGulbara;
/**
* Roll dice and generate list of moves the player has to make according to
* current rules.
*
* In this variant of the game moves for doubles are determined in the following way:
* - In first three dice rolls (counted separately for each player) doubles are played
* as four moves - eg. 5:5 is played as [5,5,5,5].
* - In all dice rolls after that, all doubles with values higher than the rolled one are played sequentially.
* For example 4:4 dice is played as [4,4,4,4], then [5,5,5,5] and finally [6,6,6,6],
* whereas 5:5 dice is played as [5,5,5,5] and [6,6,6,6].
* - If the player cannot play all moves, but has moved at least one piece, then the other player
* finishes the moves that could not be played and then rolls the dice (as it is his turn).
*
* @memberOf RuleBgGulbara
* @param {Game} game - Game object. Used to check if it is the first turn of the game.
* @param {number[]} [values] - Optional parameter containing the dice values to use,
* instead of generating random values. Used by some rules
* as RuleBgGulbara.
* @returns {Dice} - Dice object containing random values and allowed moves
*/
RuleBgGulbara.prototype.rollDice = function(game, values) {
// Create dice object with 2 random values
var dice = model.Dice.roll();
if (typeof values !== "undefined") {
dice.values[0] = values[0];
dice.values[1] = values[1];
}
// Add those values to moves list - the individual moves the player has to make
dice.moves = dice.moves.concat(dice.values);
// Dices with equal values are played four times, so add two more moves
if (dice.moves[0] == dice.moves[1]) {
dice.moves = dice.moves.concat(dice.values);
}
// Sort moves in descending order for convenience later in enforcing
// move rules
dice.moves.sort(function (a, b) { return b - a; });
// TODO: Put in movesLeft only moves that are playable.
var weight = this.calculateMoveWeights(game.state, dice.moves, game.turnPlayer.currentPieceType, null, true);
// Copy move values to movesLeft array. Moves will be removed from movesLeft
// after being played by player, whereas values in moves array will remain
// in case the player wants to undo his actions.
dice.movesLeft = dice.movesLeft.concat(weight.playableMoves);
console.log('Playable moves:', weight.playableMoves);
console.log('DICE', dice);
return dice;
};
/**
* Reset state to initial position of pieces according to current rule.
* @memberOf RuleBgGulbara
* @param {State} state - Board state
*/
RuleBgGulbara.prototype.resetState = function(state) {
/**
* Move pieces to correct initial positions for both players.
* Values in state.points are zero based and denote the .
* the number of pieces on each position.
* Index 0 of array is position 1 and increments to the number of maximum
* points.
*
* Position: |12 13 14 15 16 17| |18 19 20 21 22 23|
* | | | 15w| <-
* | | | |
* | | | |
* | | | |
* -> |15b | | |
* Position: |11 10 09 08 07 06| |05 04 03 02 01 00|
*
*/
model.State.clear(state);
this.place(state, 15, model.PieceType.WHITE, 23);
this.place(state, 15, model.PieceType.BLACK, 11);
};
/**
* Increment position by specified number of steps and return an incremented position
* @memberOf RuleBgGulbara
* @param {number} position - Denormalized position
* @param {PieceType} type - Type of piece
* @param {number} steps - Number of steps to increment towards first home position
* @returns {number} - Incremented position (denormalized)
*/
RuleBgGulbara.prototype.incPos = function(position, type, steps) {
var newPosition;
if (type === model.PieceType.WHITE) {
newPosition = position - steps;
}
else {
newPosition = position - steps;
if ((position < 12) && (newPosition < 0)) {
newPosition = 24 + newPosition;
}
else if ((position >= 12) && (newPosition <= 11)) {
newPosition = newPosition - 12;
}
}
console.log('New pos:', position, newPosition, steps);
return newPosition;
};
/**
* Normalize position - Normalized positions start from 0 to 23 for both players,
* where 0 is the first position in the home part of the board, 6 is the last
* position in the home part and 23 is the furthest position - in the opponent's
* home.
* @memberOf RuleBgGulbara
* @param {number} position - Denormalized position (0 to 23 for white and 12 to 11 for black)
* @param {PieceType} type - Type of piece (white/black)
* @returns {number} - Normalized position (0 to 23 for both players)
*/
RuleBgGulbara.prototype.normPos = function(position, type) {
var normPosition = position;
if (type === model.PieceType.BLACK) {
if (position < 0) {
normPosition = position;
}
else if (position >= 12) {
normPosition = position - 12;
}
else {
normPosition = position + 12;
}
}
return normPosition;
};
/**
* Get denormalized position - start from 0 to 23 for white player and from
* 12 to 11 for black player.
* @memberOf RuleBgGulbara
* @param {number} position - Normalized position (0 to 23 for both players)
* @param {PieceType} type - Type of piece (white/black)
* @return {number} - Denormalized position (0 to 23 for white and 12 to 11 for black)
*/
RuleBgGulbara.prototype.denormPos = function(position, type) {
var denormPosition = position;
if (type === model.PieceType.BLACK) {
if (position < 0) {
denormPosition = position;
}
else if (position >= 12) {
denormPosition = position - 12;
}
else {
denormPosition = position + 12;
}
}
return denormPosition;
};
/**
* Call this method after a request for moving a piece has been made.
* Determines if the move is allowed and what actions will have to be made as
* a result. Actions can be `move`, `place`, `hit` or `bear`.
*
* If move is allowed or not depends on the current state of the game. For example,
* if the player has pieces on the bar, they will only be allowed to place pieces.
*
* Multiple actions can be returned, if required. Placing (or moving) a piece over
* an opponent's blot will result in two actions: `hit` first, then `place` (or `move`).
*
* The list of actions returned would usually be appllied to game state and then
* sent to client. The client's UI would play the actions (eg. with movement animation)
* in the same order.
*
* @memberOf RuleBgGulbara
* @param {State} state - State
* @param {Piece} piece - Piece to move
* @param {PieceType} type - Type of piece
* @param {number} steps - Number of steps to increment towards first home position
* @returns {MoveAction[]} - List of actions if move is allowed, empty list otherwise.
*/
RuleBgGulbara.prototype.getMoveActions = function(state, piece, steps) {
var actionList = [];
// Next, check conditions specific to this game rule and build the list of
// actions that has to be made.
/**
* Create a new move action and add it to actionList. Used internally.
*
* @alias RuleBgGulbara.getMoveActions.addAction
* @memberof RuleBgGulbara.getMoveActions
* @method RuleBgGulbara.getMoveActions.addAction
* @param {MoveActionType} moveActionType - Type of move action (eg. move, hit, bear)
* @param {Piece} piece - Piece to move
* @param {number} from - Denormalized source position. If action uses only one position parameter, this one is used.
* @param {number} to - Denormalized destination position.
* @returns {MoveAction}
* @see {@link getMoveActions} for more information on purpose of move actions.
*/
function addAction(moveActionType, piece, from, to) {
var action = new model.MoveAction();
action.type = moveActionType;
action.piece = piece;
action.position = from;
action.from = from;
if (typeof to !== "undefined") {
action.to = to;
}
actionList.push(action);
return action;
}
// TODO: Catch exceptions due to disallowed move requests and pass them as error message to the client.
try {
var position = model.State.getPiecePos(state, piece);
// TODO: Consider using state machine? Is it worth, can it be useful in other methods too?
if (this.allPiecesAreHome(state, piece.type)) {
/*
If all pieces are in home field, the player can bear pieces
Cases:
- Normalized position >= 0 --> Just move the piece
- Normalized position === -1 --> Bear piece
- Normalized position < -1 --> Bear piece, only if there are no player pieces at higher positions
+12-13-14-15-16-17------18-19-20-21-22-23-+
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | O O |
| | | O O O |
+11-10--9--8--7--6-------5--4--3--2--1--0-+ -1
*/
var destination = this.incPos(position, piece.type, steps);
var normDestination = this.normPos(destination, piece.type);
// Move the piece, unless point is blocked by opponent
if (normDestination >= 0) {
var destTopPiece = model.State.getTopPiece(state, destination);
var destTopPieceType = (destTopPiece) ? destTopPiece.type : null;
// There are no pieces at this point or the top piece is owned by player,
// so just move piece to that position
if ((destTopPieceType === null) || (destTopPieceType === piece.type)) {
addAction(
model.MoveActionType.MOVE, piece, position, destination
);
}
}
// If steps are just enought to reach position -1, bear piece
else if (normDestination === -1) {
addAction(
model.MoveActionType.BEAR, piece, position
);
}
// If steps move the piece beyond -1 position, the player can bear the piece,
// only if there are no other pieces at higher positions
else {
var normSource = this.normPos(position, piece.type);
if (this.countAtHigherPos(state, normSource + 1, piece.type) <= 0) {
addAction(
model.MoveActionType.BEAR, piece, position
);
}
}
}
else {
/*
If there are no pieces at bar, and at least one piece outside home,
just move the piece.
Input data: position=13, steps=3
Cases:
- Opponent has no pieces there --> place the checker at position 10
- Opponent has one or more pieces --> point is blocked, cannot place piece there
!
+12-13-14-15-16-17------18-19-20-21-22-23-+
| O | | X |
| O | | X |
| | | X |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | |
| | | O |
| | | O O O |
+11-10--9--8--7--6-------5--4--3--2--1--0-+ -1
!
*/
var destination = this.incPos(position, piece.type, steps);
// Make sure that destination is within board
if ((destination >= 0) && (destination <= 23)) {
var normDest = this.normPos(destination, piece.type);
// TODO: Make sure position is not outside board
var destTopPiece = model.State.getTopPiece(state, destination);
var destTopPieceType = (destTopPiece) ? destTopPiece.type : null;
// There are no pieces at this point or the top piece is owned by player
if ((destTopPieceType === null) || (destTopPieceType === piece.type)) {
addAction(
model.MoveActionType.MOVE, piece, position, destination
);
}
}
}
}
catch (e) {
actionList = [];
return actionList;
if (process.env.DEBUG) {
throw e;
}
}
return actionList;
};
/**
* Mark move as played
* @memberOf RuleBgGulbara
* @abstract
* @param {Game} game - Game
* @param {number} move - Move (number of steps)
* @returns {boolean} - True if piece was moved/borne/recovered
*/
RuleBgGulbara.prototype.markAsPlayed = function (game, move) {
// Once a piece is moved, consider that the turn has been started.
// This flag is used when the player cannot play all moves.
// Remaining moves are tranfered to other player, only if
// the turn has been started.
game.turnStarted = true;
Rule.prototype.markAsPlayed.call(this, game, move);
};
/**
* Proceed to next turn.
*
* If the player has dice doubles (eg. 4:4), and this is not one of his first
* three turns, the player is given another turn, with dice values higher with 1.
*
* For example, if 4:4 is rolled, the player has one turn to play [4,4,4,4], then
* another turn to play [5,5,5,5] and a third one to play [6,6,6,6].
*
* If the player cannot use all moves, the other player is given a chance
* to play the remaining moves. After the other player plays the remaining
* moves (if possibles at all), the other player rolls the dice - its other
* player's turn.
*
* @memberOf RuleBgGulbara
* @abstract
* @param {Match} match - Match
*/
RuleBgGulbara.prototype.nextTurn = function (match) {
// This method decides if turn has really ended.
//
// If turn for current player has ended, `game.turnPlayer` should be
// switched to other player.
//
// If new dice should be rolled, `game.turnDice` should be set to `null`.
//
// If remaining moves are transfered to other player, `game.turnTransfered`
// should be set to `true`, `game.turnPlayer` should be switched to other player
// and `game.turnDice.movesLeft` should be set to the remaining moves.
var game = match.currentGame;
if (game.turnNumber > 6 && model.Dice.isDouble(game.turnDice)) {
// Check if player was able to use all moves
if (game.turnDice.movesLeft.length === 0 &&
game.turnStarted &&
game.turnDice.moves.length > game.turnDice.movesPlayed.length) {
console.log('TRANSFER', game.turnDice);
// Player was not able to use all moves, so let other player
// finish the remaining moves.
// But keep track who rolled the dice, in case the other
// player is also not able to play the moves. If that is
// the case, just proceed to next turn.
// TODO: transfer moves, only if the player has played at least one of the moves
if (!game.turnTransfered) {
// Turn has not been transfered to another player,
// so let other player finish this turn
game.turnTransfered = true;
game.turnPlayer = (game.turnPlayer.id == match.host.id) ? match.guest : match.host;
game.turnStarted = false;
game.turnDice.movesLeft.length = 0;
var remainingMoves = model.Dice.getRemainingMoves(game.turnDice);
console.log('Remaining: ', remainingMoves);
game.turnDice.movesLeft = remainingMoves;
console.log('After transfer: ', game.turnDice);
}
else {
// Turn has already been transfered once, cannot transfer it anymore.
// Proceed to next turn, but let other player roll the dice,
// as he was just playing remaining moves, that was not his turn.
game.turnTransfered = false;
game.turnDice = null;
}
}
else {
// Player was able to use all moves.
// Check if highest die value has been reached.
if (game.turnDice.values[0] == 6) {
// Highest double values reached, proceed to next turn.
if (game.turnTransfered) {
// Player is finishing remaining moves of other player.
// so let player start his own turn, after finishing moves.
game.turnTransfered = false;
game.turnDice = null;
} else {
// Player managed to play all of his double moves,
// no moves remain to be transfered, so just proceed to
// next turn.
game.turnDice = null;
game.turnPlayer = (game.turnPlayer.id == match.host.id) ? match.guest : match.host;
game.turnStarted = false;
}
}
else {
// Give next turn to the same player
var nextValue = game.turnDice.values[0] + 1;
var values = [nextValue, nextValue];
game.turnDice = this.rollDice(game, values);
}
}
}
else {
game.turnDice = null;
game.turnPlayer = (game.turnPlayer.id == match.host.id) ? match.guest : match.host;
game.turnStarted = false;
}
game.turnConfirmed = false;
game.turnNumber += 1;
};
module.exports = new RuleBgGulbara();