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App.js
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App.js
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import React from 'react'
import './App.css'
import { checkers, eq, boardString } from 'aima-checkers'
import { minimaxDecision, maximinDecision, alphaBetaSearch, betaAlphaSearch } from 'aima'
import Board from './Components/Board'
import CheckersGroup from './Components/CheckersGroup'
import Subtitles from './Components/Subtitles'
const config = {
pruning: false,
limits: {
dumb: 1,
intermediate: 3,
smart: 4
},
highlights: true,
pauseTime: 700 /* ms */
}
class App extends React.Component {
constructor () {
super()
// initialize game state and ui configuration
this.state = {
state: checkers.initialState, // game state (cf. `checkers.js`)
selectedChecker: [], // coordinates of the selected checker piece
ai: { // whether the players are played by an ai and if so which one
p: undefined,
q: undefined
},
error: [], // user interaction errors to be shown as subtitles
highlights: config.highlights, // whether possible actions are highlighted
displayQueue: [] // contains action parts which still have to be displayed
}
// note that react state variables are accessed via `this.state` in general,
// so the game state is accessed via `this.state.state`
}
render () {
return (
<div className='app'>
<Board
highlightedSquares={
checkers.actions(this.state.state)
.filter(action => eq(action[0], this.state.selectedChecker))
.map(action => action[action.length - 1])
}
highlights={this.state.highlights}
parentCallback={(y, x, validMove) => this.move(y, x, validMove)}
/>
{['p', 'q'].map(player =>
<CheckersGroup
key={player}
player={player}
pieces={this.state.state[player]}
selectedChecker={this.state.selectedChecker}
highlightedCheckers={
this.state.highlights &&
this.state.state.player === player &&
!this.state.ai[this.state.state.player]
? checkers.actions(this.state.state).map(action => action[0])
: []
}
parentCallback={(y, x) => this.highlight(y, x, player)}
/>
)}
<Subtitles
parentCallback={arg => {
if ('highlights' in arg) {
this.setState({ highlights: arg.highlights })
} else if ('ai' in arg) {
this.setState({ ai: { ...this.state.ai, [arg.ai[0]]: arg.ai[1] } })
setTimeout(() => this.aiMove(), 0)
}
}}
error={this.state.error}
ai={this.state.ai}
state={this.state.state}
highlights={this.state.highlights}
limits={config.limits}
/>
</div>
)
}
move (y, x, validMove) {
if (validMove) {
// when the user makes a manual move on one side, disable the ai for that side
const ai = this.state.ai
if (this.state.ai.p === undefined) ai.p = false
else if (this.state.ai.q === undefined) ai.q = false
this.setState({ ai: ai })
// perform move from highlighted checker to selected square
this.setState({
displayQueue: [
checkers.actions(this.state.state).filter(action =>
eq(action[0], this.state.selectedChecker) &&
eq(action[action.length - 1], [y, x])
)[0]
]
})
setTimeout(() => this.step(), 0)
} else this.setState({ error: ['invalid move', this.state, y, x] })
}
highlight (y, x, player) {
if (
player === this.state.state.player &&
checkers.actions(this.state.state).some(action => eq(action[0], [y, x]))
) {
this.setState({
selectedChecker: [y, x],
error: []
})
} else {
this.setState({ error: ['invalid checker', this.state, y, x, player] })
}
}
step () {
if (!checkers.terminalTest(this.state.state) && this.state.displayQueue.length > 0) {
const action = this.state.displayQueue[0]
if (this.state.displayQueue.length > 1 || action.length > 2) {
setTimeout(() => this.step(), config.pauseTime)
} else {
setTimeout(() => this.aiMove(), config.pauseTime)
}
console.log(moveToString(this.state.state.player, action))
this.setState({
state: {
...checkers.result(this.state.state, action.slice(0, 2)),
player: action.length <= 2 && this.state.displayQueue.length <= 1
? this.state.state.opponent
: this.state.state.player,
opponent: action.length <= 2 && this.state.displayQueue.length <= 1
? this.state.state.player
: this.state.state.opponent
},
displayQueue: [
...action.length > 2 ? [action.slice(1)] : [],
...this.state.displayQueue.slice(1)
],
error: [],
selectedChecker: []
})
console.log(boardString(this.state.state))
}
}
aiMove () {
const search = {
p: config.pruning ? alphaBetaSearch : minimaxDecision,
q: config.pruning ? betaAlphaSearch : maximinDecision
}
const randAction = actions => actions[Math.floor(Math.random() * actions.length)]
const move = player => {
this.setState({
displayQueue: [this.state.ai[player] === 'random'
// random move
? randAction(checkers.actions(this.state.state))
// minimax / maximin move
: search[player](checkers, this.state.state, config.limits[this.state.ai[player]]).action]
})
setTimeout(() => this.step(), config.pauseTime + config.animationTime)
}
if (this.state.ai.p && this.state.state.player === 'p') {
move('p')
} else if (this.state.ai.q && this.state.state.player === 'q') {
move('q')
}
}
}
const moveToString = (player, action) =>
(player === 'p' ? 'brown: ' : 'beige: ') +
action.map(([y, x]) => y + ', ' + x).join(' -> ')
export default App