brackt/app/lib/__tests__/corona-states.test.ts

import { describe, it, expect } from "vitest";
import { computeCoronaStates } from "../corona-states";

const RULES = {
  pointsFor1st: 100, pointsFor2nd: 70, pointsFor3rd: 50, pointsFor4th: 40,
  pointsFor5th: 25, pointsFor6th: 25, pointsFor7th: 15, pointsFor8th: 15,
};

function pick(id: string, scoringPattern: string | null, sportsSeasonId = "ss-1") {
  return { participant: { id, sportsSeasonId }, scoringPattern };
}

function results(
  rows: Array<{ participantId: string; finalPosition: number | null; isPartialScore?: boolean }>
) {
  return new Map(
    rows.map((r) => [r.participantId, { isPartialScore: false, ...r }])
  );
}

describe("computeCoronaStates", () => {
  const noTies = new Map<string, Map<number, number>>();

  it("splits points for a tied qualifying_points pick", () => {
    // Rahm tied for 8th. 9th is outside the scoring range and contributes 0,
    // so (15 + 0) / 2 = 7.5 → 8. Before the shared helper this path awarded the
    // full 15 while the standings awarded the split — the reported bug.
    const states = computeCoronaStates(
      [pick("rahm", "qualifying_points")],
      results([{ participantId: "rahm", finalPosition: 8 }]),
      new Map(),
      RULES,
      RULES.pointsFor1st,
      new Map([["ss-1", new Map([[8, 2]])]])
    );

    expect(states.rahm).toEqual({
      type: "scored",
      points: 8,
      brightness: 8 / 100,
    });
  });

  it("awards the full value when the placement is untied", () => {
    const states = computeCoronaStates(
      [pick("rahm", "qualifying_points")],
      results([{ participantId: "rahm", finalPosition: 8 }]),
      new Map(),
      RULES,
      RULES.pointsFor1st,
      noTies
    );

    expect(states.rahm).toMatchObject({ type: "scored", points: 15 });
  });

  it("still averages bracket tiers via the bracket template", () => {
    const states = computeCoronaStates(
      [pick("team-a", "playoff_bracket")],
      results([{ participantId: "team-a", finalPosition: 5 }]),
      new Map([["ss-1", null]]),
      RULES,
      RULES.pointsFor1st,
      noTies
    );

    // Four QF losers share 5th-8th: (25 + 25 + 15 + 15) / 4 = 20
    expect(states["team-a"]).toMatchObject({ type: "scored", points: 20 });
  });

  it("scores other patterns straight off the placement", () => {
    const states = computeCoronaStates(
      [pick("driver", "season_standings")],
      results([{ participantId: "driver", finalPosition: 2 }]),
      new Map(),
      RULES,
      RULES.pointsFor1st,
      noTies
    );

    expect(states.driver).toMatchObject({ type: "scored", points: 70 });
  });

  it("marks picks with no result as pending", () => {
    const states = computeCoronaStates(
      [pick("rahm", "qualifying_points")],
      results([]),
      new Map(),
      RULES,
      RULES.pointsFor1st,
      noTies
    );

    expect(states.rahm).toEqual({ type: "pending" });
  });

  it("marks a finalized zero placement as eliminated", () => {
    const states = computeCoronaStates(
      [pick("rahm", "qualifying_points")],
      results([{ participantId: "rahm", finalPosition: 0 }]),
      new Map(),
      RULES,
      RULES.pointsFor1st,
      noTies
    );

    expect(states.rahm).toEqual({ type: "eliminated", points: 0 });
  });

  it("keeps brightness within range when a tier exceeds maxPoints", () => {
    const states = computeCoronaStates(
      [pick("champ", "season_standings")],
      results([{ participantId: "champ", finalPosition: 1 }]),
      new Map(),
      RULES,
      10, // deliberately below the 1st-place award
      noTies
    );

    expect(states.champ).toMatchObject({ brightness: 1 });
  });
});