import { describe, it, expect, vi, beforeEach } from "vitest";

/**
 * Regression tests for getTeamScoreBreakdown — the team detail page's points.
 *
 * This path used to branch only on `isBracket`, so a qualifying_points
 * participant tied for a placement was awarded the FULL placement value here
 * while calculateTeamScore (which writes team_standings) awarded the split. A
 * team therefore read 225 on its team page and 218 in the standings.
 *
 * The load-bearing assertion is the last one: the breakdown's actualPoints must
 * equal calculateTeamScore's totalPoints for the same fixture. Anything that
 * makes these two disagree reintroduces the bug.
 */

vi.mock("~/services/ev-calculator", () => ({
  calculateEV: vi.fn(),
}));

vi.mock("../participant-expected-value", () => ({
  getParticipantEV: vi.fn(),
}));

import { getTeamScoreBreakdown } from "../standings";
import { calculateTeamScore } from "../scoring-calculator";
import { getParticipantEV } from "../participant-expected-value";

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

function makePick(
  participantId: string,
  name: string,
  scoringPattern: string,
  finalPosition: number | null,
  { sportsSeasonId = "ss-1", isPartialScore = false, pickNumber = 1 } = {}
) {
  return {
    pickNumber,
    round: 1,
    participant: {
      id: participantId,
      name,
      sportsSeasonId,
      results: finalPosition === null ? [] : [{ finalPosition, isPartialScore }],
      sportsSeason: { scoringPattern, sport: { name: "Golf" } },
    },
  };
}

/**
 * @param extraResults results for participants NOBODY drafted. They still count
 *   toward a tie span, which is exactly why the tie query cannot be narrowed to
 *   drafted participants.
 */
function makeDb(
  picks: ReturnType<typeof makePick>[],
  extraResults: { sportsSeasonId: string; finalPosition: number }[] = []
) {
  const seasonResults = [
    ...picks.flatMap((pick) =>
      pick.participant.results
        .filter((r) => r.finalPosition !== null)
        .map((r) => ({
          sportsSeasonId: pick.participant.sportsSeasonId,
          finalPosition: r.finalPosition,
        }))
    ),
    ...extraResults,
  ];

  return {
    query: {
      seasons: { findFirst: vi.fn().mockResolvedValue(SCORING) },
      draftPicks: { findMany: vi.fn().mockResolvedValue(picks) },
      scoringEvents: { findFirst: vi.fn().mockResolvedValue({ bracketTemplateId: null }) },
      seasonParticipantResults: { findMany: vi.fn().mockResolvedValue(seasonResults) },
      teams: { findFirst: vi.fn().mockResolvedValue({ id: "team-1", name: "Mike" }) },
    },
  } as any;
}

describe("getTeamScoreBreakdown", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    vi.mocked(getParticipantEV).mockResolvedValue(null as any);
  });

  it("splits a tied qualifying_points placement", async () => {
    // Rahm tied for 8th with an undrafted player: (15 + 0) / 2 = 7.5 → 8.
    const db = makeDb(
      [makePick("rahm", "Jon Rahm", "qualifying_points", 8)],
      [{ sportsSeasonId: "ss-1", finalPosition: 8 }]
    );

    const breakdown = await getTeamScoreBreakdown("team-1", "season-1", db);

    expect(breakdown?.picks[0]).toMatchObject({
      participant: expect.objectContaining({ name: "Jon Rahm" }),
      finalPosition: 8,
      points: 8,
    });
    expect(breakdown?.actualPoints).toBe(8);
  });

  it("awards the full placement value when untied", async () => {
    const db = makeDb([makePick("rahm", "Jon Rahm", "qualifying_points", 8)]);

    const breakdown = await getTeamScoreBreakdown("team-1", "season-1", db);

    expect(breakdown?.picks[0].points).toBe(15);
    expect(breakdown?.actualPoints).toBe(15);
  });

  it("counts undrafted participants in the tie span", async () => {
    // Three-way tie for 6th where two of the three went undrafted:
    // (25 + 15 + 15) / 3 = 18.33 → 18, the rules page's published example.
    const db = makeDb(
      [makePick("golfer", "Tied Golfer", "qualifying_points", 6)],
      [
        { sportsSeasonId: "ss-1", finalPosition: 6 },
        { sportsSeasonId: "ss-1", finalPosition: 6 },
      ]
    );

    const breakdown = await getTeamScoreBreakdown("team-1", "season-1", db);

    expect(breakdown?.picks[0].points).toBe(18);
  });

  it("still averages bracket tiers", async () => {
    const db = makeDb([makePick("team-a", "Team A", "playoff_bracket", 5)]);

    const breakdown = await getTeamScoreBreakdown("team-1", "season-1", db);

    // Four QF losers share 5th-8th: (25 + 25 + 15 + 15) / 4 = 20
    expect(breakdown?.picks[0].points).toBe(20);
  });

  it("leaves picks without a result at zero points", async () => {
    const db = makeDb([makePick("pending", "Pending Golfer", "qualifying_points", null)]);

    const breakdown = await getTeamScoreBreakdown("team-1", "season-1", db);

    expect(breakdown?.picks[0]).toMatchObject({ points: 0, isComplete: false });
    expect(breakdown?.actualPoints).toBe(0);
  });

  it("agrees with calculateTeamScore on the same roster", async () => {
    // The reported bug in miniature: a tied golfer plus untied picks. Both
    // functions read the same fixture, so any divergence is a real regression.
    const roster = () => [
      makePick("rahm", "Jon Rahm", "qualifying_points", 8, { pickNumber: 1 }),
      makePick("scheffler", "Scottie Scheffler", "qualifying_points", 1, { pickNumber: 2 }),
      makePick("team-a", "Team A", "playoff_bracket", 5, {
        sportsSeasonId: "ss-2",
        pickNumber: 3,
      }),
    ];
    const undrafted = [{ sportsSeasonId: "ss-1", finalPosition: 8 }];

    const breakdown = await getTeamScoreBreakdown(
      "team-1",
      "season-1",
      makeDb(roster(), undrafted)
    );
    const score = await calculateTeamScore(
      "team-1",
      "season-1",
      makeDb(roster(), undrafted)
    );

    expect(breakdown?.actualPoints).toBe(score.totalPoints);
    expect(breakdown?.actualPoints).toBe(128); // 8 (T8) + 100 (1st) + 20 (T5-8)
  });
});