# holdem-poker
Javascript Holdem Poker Engine

# Install
```shell
npm install holdem-poker --save
```

# API
### Suit
string with value any one of **CLUB**, **DIAMOND**, **HEART**, **SPADE**

### Card
- suit: Suit
- value: number
>Note: value is in the range from 2 to 14 where 11 = J, 12 = Q, 13 = K and 14 = A

### GameState
- pot: number
> Current pot amount
- communityCards: Array<Card>
> Community cards at the table
- players: Array
 - money: number
 > Amount of money a player have
 - hand: Array<Card>
 > Player cards
 - folded: boolean
 > Whether the player already folded
 - active: boolean
 > Is the player left the game or not
 - currentDecision: string
 > Current decision the player has made
 - currentBet: number
 > Betting amount for current round
 - availableActions: Array<string>
 > Actions the player can take at the moment

### Game
- **constructor(playerMoney: Array&lt;number&gt;, initialBet: number)** ⇒
  Inititalizes the Game. The deck is shuffled randomly with 'Fisher-Yates' algorithm.
  Number of players will be the same length as ***playerMoney*** 
- **getState(): GameState** ⇒
  Returns the current game state
- **startRound(): void** ⇒
  Starts the round if not started yet
- **bet(index: number): void** ⇒
  Bet the initial betting amount(only in the opening round)
- **check(index: number): void** ⇒
  Bet 0 unit of money(only after the opening round)
- **raise(index: number, money: number): void** ⇒
  Raise by a player(can re-raise in the same round)
- **call(index: number): void** ⇒
  Match the highest bet in the same round
- **fold(index: number): void** ⇒
  Fold by a player
- **canEndRound(): boolean** ⇒
  Whether the current round can be ended
- **endRound(): void** ⇒
  Ends the current round.
- **checkResult(): Result** ⇒
  Returns the result of the current round
- **computeHand(hand: Array&lt;Card&gt;): HandValue** ⇒
  Returns the max possible hand value. ***Note: Community cards are ignored.***

# Usage
## Browser
```javascript
var game = Poker.Game(...)
```
## Node
```javascript
var {Game} = require('holdem-poker');
var game=new Game(...);
```
### Example:
```javascript
var {Game} = require('holdem-poker');
//initialize with 2 players, each having 100 unit money, and initial bet is 10 unit
var game=new Game([ 100, 100 ], 10);
//a demo gameplay is shown bellow
console.log('round 1 - no cards dealt (ante up)');
console.log(
  'Players',
  game.getState().players.map(function (m) {
    return m.hand;
  })
);
console.log('Table', game.getState().communityCards);
game.startRound();
game.bet(0); //for player 1
game.raise(1, 20); //for player 2
game.call(0);
game.endRound();

console.log('round 2 - 3 cards dealt (flop)');
console.log('Table', game.getState().communityCards);
game.startRound();
game.check(0); //for player 1
game.check(1); //for player 2
game.endRound();

console.log('round 3 - 4 cards dealt');
console.log('Table', game.getState().communityCards);
game.startRound();
game.raise(0, 50); //for player 1
game.call(1); //for player 2
game.endRound();

console.log('round 4 - 5 cards dealt (river)');
console.log('Table', game.getState().communityCards);
game.startRound();
game.call(0); //for player 1
game.call(1); //for player 2
game.endRound();

console.log('end game');
var result = game.checkResult();
if (result.type == 'win') {
  console.log('Player' + (result.index + 1) + ' won with ' + result.name);
} else {
  console.log('Draw');
}
```