import { describe, it, expect, vi, beforeEach } from "vitest";
import { NbaStandingsAdapter } from "../nba";

function makeStat(name: string, value: number, displayValue?: string) {
  return { name, value, displayValue: displayValue ?? String(value) };
}

const SAMPLE_NBA_RESPONSE = {
  children: [
    {
      name: "Eastern Conference",
      children: [
        {
          name: "Atlantic Division",
          standings: {
            entries: [
              {
                team: { id: "2", displayName: "Boston Celtics", abbreviation: "BOS" },
                stats: [
                  makeStat("wins", 52),
                  makeStat("losses", 16),
                  makeStat("winPercent", 0.765),
                  makeStat("gamesBehind", 0),
                  makeStat("playoffSeed", 1),
                  { name: "streak", value: 5, displayValue: "W5" },
                  makeStat("homeWins", 28),
                  makeStat("homeLosses", 7),
                  makeStat("awayWins", 24),
                  makeStat("awayLosses", 9),
                ],
              },
              {
                team: { id: "7", displayName: "Toronto Raptors", abbreviation: "TOR" },
                stats: [
                  makeStat("wins", 22),
                  makeStat("losses", 46),
                  makeStat("winPercent", 0.324),
                  makeStat("gamesBehind", 30),
                  makeStat("playoffSeed", 12),
                  { name: "streak", value: 2, displayValue: "L2" },
                  makeStat("homeWins", 12),
                  makeStat("homeLosses", 22),
                  makeStat("awayWins", 10),
                  makeStat("awayLosses", 24),
                ],
              },
            ],
          },
        },
      ],
    },
    {
      name: "Western Conference",
      children: [
        {
          name: "Northwest Division",
          standings: {
            entries: [
              {
                team: { id: "21", displayName: "Oklahoma City Thunder", abbreviation: "OKC" },
                stats: [
                  makeStat("wins", 58),
                  makeStat("losses", 10),
                  makeStat("winPercent", 0.853),
                  makeStat("gamesBehind", 0),
                  makeStat("playoffSeed", 1),
                  { name: "streak", value: 4, displayValue: "W4" },
                  makeStat("homeWins", 30),
                  makeStat("homeLosses", 4),
                  makeStat("awayWins", 28),
                  makeStat("awayLosses", 6),
                ],
              },
            ],
          },
        },
      ],
    },
  ],
};

describe("NbaStandingsAdapter", () => {
  beforeEach(() => {
    vi.stubGlobal("fetch", vi.fn());
  });

  it("maps ESPN API response to FetchedStandingsRecord[]", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_NBA_RESPONSE,
    } as Response);

    const adapter = new NbaStandingsAdapter();
    const records = await adapter.fetchStandings();

    expect(records).toHaveLength(3);

    const okc = records.find((r) => r.teamName === "Oklahoma City Thunder");
    if (!okc) throw new Error("Oklahoma City Thunder record not found");
    expect(okc).toBeDefined();
    expect(okc.wins).toBe(58);
    expect(okc.losses).toBe(10);
    expect(okc.conference).toBe("Western Conference");
    expect(okc.division).toBe("Northwest Division");
    expect(okc.otLosses).toBeUndefined();
  });

  it("assigns conference correctly", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_NBA_RESPONSE,
    } as Response);

    const adapter = new NbaStandingsAdapter();
    const records = await adapter.fetchStandings();

    const bos = records.find((r) => r.teamName === "Boston Celtics");
    if (!bos) throw new Error("Boston Celtics record not found");
    expect(bos.conference).toBe("Eastern Conference");
    expect(bos.division).toBe("Atlantic Division");
  });

  it("extracts streak from stats array", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_NBA_RESPONSE,
    } as Response);

    const adapter = new NbaStandingsAdapter();
    const records = await adapter.fetchStandings();

    const bos = records.find((r) => r.teamName === "Boston Celtics");
    if (!bos) throw new Error("Boston Celtics record not found");
    expect(bos.streak).toBe("W5");

    const tor = records.find((r) => r.teamName === "Toronto Raptors");
    if (!tor) throw new Error("Toronto Raptors record not found");
    expect(tor.streak).toBe("L2");
  });

  it("does not set otLosses (NBA has no OT losses)", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_NBA_RESPONSE,
    } as Response);

    const adapter = new NbaStandingsAdapter();
    const records = await adapter.fetchStandings();

    for (const record of records) {
      expect(record.otLosses).toBeUndefined();
    }
  });

  it("throws on non-ok response", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: false,
      status: 429,
      statusText: "Too Many Requests",
    } as Response);

    const adapter = new NbaStandingsAdapter();
    await expect(adapter.fetchStandings()).rejects.toThrow("429");
  });

  it("throws when no entries returned", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => ({ children: [] }),
    } as Response);

    const adapter = new NbaStandingsAdapter();
    await expect(adapter.fetchStandings()).rejects.toThrow("no entries");
  });
});
