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update scoring algorithm #11

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merged 1 commit into from
Aug 11, 2023
Merged

update scoring algorithm #11

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46 changes: 31 additions & 15 deletions main.w
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Original file line number Diff line number Diff line change
Expand Up @@ -43,6 +43,15 @@ struct SelectWinnerResponse {

class Util {
extern "./util.js" static inflight jsonToSelectWinnerRequest(json: Json): SelectWinnerRequest;

static inflight clamp(value: num, min: num, max: num): num {
if value < min {
return min;
} elif value > max {
return max;
}
return value;
}
}

// --- application ---
Expand All @@ -57,6 +66,19 @@ class Store {
this.table.putItem(_entryToMap(entry));
}

inflight getEntry(name: str): Entry {
let item = this.table.getItem(Map<ddb.Attribute> {
"Name" => ddb.Attribute {
type: ddb.AttributeType.String,
value: name,
},
});
return Entry {
name: name,
score: num.fromStr(str.fromJson(item.get("Score").value)),
};
}

inflight getRandomPair(): Array<Entry> {
let entries = this.table.scan();

Expand All @@ -74,18 +96,14 @@ class Store {
inflight updateScores(winner: str, loser: str): Array<num> {
let entries = this.list();

let var winnerScore = 0;
let var loserScore = 0;
for entry in entries {
if entry.name == winner {
winnerScore = entry.score;
} elif entry.name == loser {
loserScore = entry.score;
}
}
let winnerScore = this.getEntry(winner).score;
let loserScore = this.getEntry(loser).score;

// probability that the winner should have won
let pWinner = 1.0 / (1.0 + 10 ** (loserScore - winnerScore) / 400.0);

let var winnerNewScore = winnerScore + 1;
let var loserNewScore = loserScore - 1;
let winnerNewScore = Util.clamp(winnerScore + 32 * (1.0 - pWinner), 1000, 2000);
let loserNewScore = Util.clamp(loserScore + 32 * (pWinner - 1.0), 1000, 2000);

this.setEntry(Entry { name: winner, score: winnerNewScore });
this.setEntry(Entry { name: loser, score: loserNewScore });
Expand Down Expand Up @@ -154,16 +172,14 @@ new cloud.OnDeploy(inflight () => {
for food in foods {
store.setEntry(Entry {
name: food,
score: 0,
score: 1500,
});
}
}) as "InitializeTable";

let api = new cloud.Api() as "VotingAppApi";

let website = new cloud.Website(
path: "./website/build",
);
let website = new cloud.Website(path: "./website/build");
website.addJson("config.json", { apiUrl: api.url });

// Select two random items from the list of items for the user to choose between
Expand Down