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import { GameMode, SettingsJSON, TimeInterval } from "../types/settings"
import { Stats, Wld } from "../types/stats"
/**
* A utility class for calculating chess statistics based on filtered games.
*/
export class StatsCalculator {
private validTimeIntervals: { [key: string]: number }
/**
* Constructs a new instance of the StatsCalculator class.
*
* @param {SettingsJSON} settingsJSON - The settings JSON object.
*/
constructor(settingsJSON: SettingsJSON) {
this.validTimeIntervals = settingsJSON.timeIntervalsMS
}
/**
* Calculates chess statistics for filtered games.
*
* @param {ApiGame[]} games - The array of API games.
* @param {GameMode[]} gameModes - The array of game modes to include.
* @param {TimeInterval} timeInterval - The time interval for filtering games.
* @param {string} username - The username for identifying player's games.
* @returns {Stats} The calculated statistics.
*/
calculateStats(
games: ApiGame[],
gameModes: GameMode[],
timeInterval: TimeInterval,
username: string
): Stats {
games = this.filterGames(games, gameModes, timeInterval)
const stats: Stats = {
wld: { wins: 0, loses: 0, draws: 0, games: games.length },
accuracy: {
avg: 0,
wld: {
wins: 0,
loses: 0,
draws: 0,
games: games.length
}
}
}
games.forEach((game) => {
const color =
game.white.username.toLowerCase() === username.toLowerCase()
? "white"
: "black"
const result = this.transformResult(game[color].result)
if (!result) {
console.error("Unknown result", result)
return
}
stats.wld[result]++
if (game.accuracies) {
stats.accuracy.avg += game.accuracies[color] || 0
stats.accuracy.wld[result]++
} else stats.accuracy.wld.games--
})
stats.accuracy.avg = parseFloat(
(stats.accuracy.avg / stats.accuracy.wld.games).toFixed(0)
)
if (isNaN(stats.accuracy.avg)) stats.accuracy.avg = 0
return stats
}
/**
* Filters games based on game modes and time intervals.
*
* @param {ApiGame[]} games - The array of API games.
* @param {GameMode[]} gameModes - The array of game modes to include.
* @param {TimeInterval} timeInterval - The time interval for filtering games.
* @returns {ApiGame[]} The filtered array of games.
*/
filterGames(
games: ApiGame[],
gameModes: GameMode[],
timeInterval: TimeInterval
): ApiGame[] {
return games
.filter((game) =>
Array.isArray(gameModes)
? gameModes.includes(game.time_class as GameMode)
: game.time_class === gameModes
)
.filter((game) => this.checkTimeInterval(game.end_time, timeInterval))
}
/**
* Checks if a game end time falls within the specified time interval.
*
* @param {number} end_time - End time of the chess game in seconds since epoch.
* @param {TimeInterval} time_interval - Time interval as a string (e.g., "last 6 hours", "last week").
* @returns {boolean} True if the game end time falls within the specified time interval, otherwise false.
*/
checkTimeInterval(end_time: number, time_interval: TimeInterval): boolean {
const current_date = Math.floor(Date.now() / 1000)
if (time_interval === "this month") return true
if (end_time > current_date) return false
if (time_interval in this.validTimeIntervals)
return end_time > current_date - this.validTimeIntervals[time_interval]
return false
}
/**
* Transforms a game result string into a corresponding Wld key.
*
* @param {string} result - Game result string.
* @returns {keyof Wld | undefined} A key of the Wld object (e.g., "wins", "loses", "draws") or undefined if the result is unknown.
*/
transformResult(result: string): keyof Wld | undefined {
switch (result) {
case "win":
return "wins"
case "lose":
case "checkmated":
case "resigned":
case "timeout":
case "abandoned":
case "bughousepartnerlose":
return "loses"
case "agreed":
case "timevsinsufficient":
case "repetition":
case "stalemate":
case "insufficient":
case "50move":
return "draws"
default:
throw `Cannot transform unknown result: ${result}`
}
}
}
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