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

// populateBracketFromDraw upserts a full draw into playoff_matches and reports
// which losers' matches *transitioned to complete on this run* — the signal used
// to announce knockouts once, idempotently across re-syncs.

const existingRows: Array<Record<string, unknown>> = [];

const mockDb = {
  query: {
    playoffMatches: {
      findMany: vi.fn(async () => existingRows),
    },
  },
  update: vi.fn(() => ({
    set: vi.fn(() => ({ where: vi.fn().mockResolvedValue(undefined) })),
  })),
  insert: vi.fn(() => ({
    values: vi.fn(() => ({ returning: vi.fn().mockResolvedValue([]) })),
  })),
};

vi.mock("~/database/context", () => ({ database: () => mockDb }));

import { populateBracketFromDraw, type ResolvedDrawMatch } from "../playoff-match";

const EVENT_ID = "ev-1";

function match(overrides: Partial<ResolvedDrawMatch> = {}): ResolvedDrawMatch {
  return {
    externalMatchId: "m-1",
    round: "Round of 64",
    matchNumber: 1,
    participant1Id: "winner",
    participant2Id: "loser",
    winnerId: "winner",
    loserId: "loser",
    isScoring: false,
    ...overrides,
  };
}

beforeEach(() => {
  vi.clearAllMocks();
  existingRows.length = 0;
});

describe("populateBracketFromDraw newlyDecidedLoserIds", () => {
  it("reports the loser of a brand-new completed match", async () => {
    const { newlyDecidedLoserIds } = await populateBracketFromDraw(EVENT_ID, [
      match({ externalMatchId: "m-1", loserId: "mensik" }),
    ]);

    expect(newlyDecidedLoserIds).toEqual(["mensik"]);
  });

  it("reports the loser of an existing match that just reached completion", async () => {
    existingRows.push({
      id: "row-1",
      externalMatchId: "m-1",
      isComplete: false,
      loserId: null,
      winnerId: null,
    });

    const { newlyDecidedLoserIds } = await populateBracketFromDraw(EVENT_ID, [
      match({ externalMatchId: "m-1", loserId: "mensik" }),
    ]);

    expect(newlyDecidedLoserIds).toEqual(["mensik"]);
  });

  it("reports nothing on an idempotent re-sync of an already-complete match", async () => {
    existingRows.push({
      id: "row-1",
      externalMatchId: "m-1",
      isComplete: true,
      loserId: "mensik",
      winnerId: "winner",
    });

    const { newlyDecidedLoserIds } = await populateBracketFromDraw(EVENT_ID, [
      match({ externalMatchId: "m-1", loserId: "mensik" }),
    ]);

    expect(newlyDecidedLoserIds).toEqual([]);
  });

  it("ignores incomplete matches (no winner/loser yet)", async () => {
    const { newlyDecidedLoserIds, completed } = await populateBracketFromDraw(EVENT_ID, [
      match({ externalMatchId: "m-2", winnerId: null, loserId: null }),
    ]);

    expect(newlyDecidedLoserIds).toEqual([]);
    expect(completed).toBe(0);
  });

  it("collects only the newly-decided losers in a mixed batch", async () => {
    existingRows.push(
      { id: "row-1", externalMatchId: "m-1", isComplete: true, loserId: "old", winnerId: "w1" },
      { id: "row-2", externalMatchId: "m-2", isComplete: false, loserId: null, winnerId: null },
    );

    const { newlyDecidedLoserIds } = await populateBracketFromDraw(EVENT_ID, [
      match({ externalMatchId: "m-1", loserId: "old" }), // already complete → skip
      match({ externalMatchId: "m-2", loserId: "freshly-out" }), // transitioned → include
      match({ externalMatchId: "m-3", loserId: "brand-new-out" }), // new complete → include
      match({ externalMatchId: "m-4", winnerId: null, loserId: null }), // incomplete → skip
    ]);

    expect(newlyDecidedLoserIds.toSorted()).toEqual(["brand-new-out", "freshly-out"]);
  });
});