import { describe, it, expect, vi, beforeEach } from "vitest";
import { MlbStandingsAdapter } from "../mlb";

// Minimal ESPN-shaped response: AL East + NL East with a few teams
const SAMPLE_ESPN_RESPONSE = {
  children: [
    {
      name: "American League",
      children: [
        {
          name: "American League East",
          standings: {
            entries: [
              {
                team: { id: "2", displayName: "Baltimore Orioles" },
                stats: [
                  { name: "wins", value: 47 },
                  { name: "losses", value: 34 },
                  { name: "winPercent", value: 0.58 },
                  { name: "gamesBehind", value: 0 },
                  { name: "streak", displayValue: "W3" },
                  { name: "Home", displayValue: "24-15" },
                  { name: "Road", displayValue: "23-19" },
                  { name: "Last Ten Games", displayValue: "7-3" },
                  { name: "playoffSeed", value: 1 },
                ],
              },
              {
                team: { id: "3", displayName: "Boston Red Sox" },
                stats: [
                  { name: "wins", value: 42 },
                  { name: "losses", value: 39 },
                  { name: "winPercent", value: 0.519 },
                  { name: "gamesBehind", value: 5.0 },
                  { name: "streak", displayValue: "L2" },
                  { name: "Home", displayValue: "22-18" },
                  { name: "Road", displayValue: "20-21" },
                  { name: "Last Ten Games", displayValue: "4-6" },
                  { name: "playoffSeed", value: 2 },
                ],
              },
            ],
          },
        },
      ],
    },
    {
      name: "National League",
      children: [
        {
          name: "National League East",
          standings: {
            entries: [
              {
                team: { id: "21", displayName: "New York Mets" },
                stats: [
                  { name: "wins", value: 43 },
                  { name: "losses", value: 38 },
                  { name: "winPercent", value: 0.531 },
                  { name: "gamesBehind", value: 0 },
                  { name: "streak", displayValue: "W1" },
                  { name: "Home", displayValue: "22-17" },
                  { name: "Road", displayValue: "21-21" },
                  { name: "Last Ten Games", displayValue: "6-4" },
                  { name: "playoffSeed", value: 1 },
                ],
              },
            ],
          },
        },
      ],
    },
  ],
};

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

  it("maps AL teams to conference 'AL'", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.conference).toBe("AL");
  });

  it("maps NL teams to conference 'NL'", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const mets = records.find((r) => r.teamName === "New York Mets");
    expect(mets?.conference).toBe("NL");
  });

  it("maps division names correctly", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    const mets = records.find((r) => r.teamName === "New York Mets");
    expect(ori?.division).toBe("AL East");
    expect(mets?.division).toBe("NL East");
  });

  it("maps wins, losses, gamesPlayed, and winPct", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.wins).toBe(47);
    expect(ori?.losses).toBe(34);
    expect(ori?.gamesPlayed).toBe(81);
    expect(ori?.winPct).toBeCloseTo(0.58, 2);
  });

  it("formats streak as 'W3' or 'L2'", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    const bos = records.find((r) => r.teamName === "Boston Red Sox");
    expect(ori?.streak).toBe("W3");
    expect(bos?.streak).toBe("L2");
  });

  it("extracts lastTen from Last Ten Games stat", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.lastTen).toBe("7-3");
  });

  it("gamesBack is 0 for the division leader (ESPN returns numeric 0, not '-')", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.gamesBack).toBe(0);
  });

  it("gamesBack is a positive number for non-leaders", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const bos = records.find((r) => r.teamName === "Boston Red Sox");
    expect(bos?.gamesBack).toBeCloseTo(5.0, 1);
  });

  it("extracts homeRecord and awayRecord", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.homeRecord).toBe("24-15");
    expect(ori?.awayRecord).toBe("23-19");
  });

  it("computes leagueRank sorted by wins desc across all teams", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    // Baltimore (47W) should rank #1 overall, Boston (42W) should rank #2
    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    const bos = records.find((r) => r.teamName === "Boston Red Sox");
    expect(ori?.leagueRank).toBe(1);
    expect(bos?.leagueRank).toBeGreaterThan(1);
  });

  it("uses ESPN string team id as externalTeamId", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

    const ori = records.find((r) => r.teamName === "Baltimore Orioles");
    expect(ori?.externalTeamId).toBe("2");
  });

  it("never sets otLosses (MLB has no OT losses)", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => SAMPLE_ESPN_RESPONSE,
    } as Response);

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

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

  it("throws on non-ok HTTP response", async () => {
    vi.mocked(fetch).mockResolvedValueOnce({
      ok: false,
      status: 406,
      statusText: "Not Acceptable",
    } as Response);

    const adapter = new MlbStandingsAdapter();
    await expect(adapter.fetchStandings()).rejects.toThrow("406");
  });

  it("produces a stable leagueRank when two teams are tied on wins and losses", async () => {
    const tiedResponse = {
      children: [
        {
          name: "American League",
          children: [
            {
              name: "American League East",
              standings: {
                entries: [
                  {
                    team: { id: "99", displayName: "Z Team" },
                    stats: [
                      { name: "wins", value: 40 },
                      { name: "losses", value: 40 },
                      { name: "winPercent", value: 0.5 },
                    ],
                  },
                  {
                    team: { id: "98", displayName: "A Team" },
                    stats: [
                      { name: "wins", value: 40 },
                      { name: "losses", value: 40 },
                      { name: "winPercent", value: 0.5 },
                    ],
                  },
                ],
              },
            },
          ],
        },
      ],
    };

    vi.mocked(fetch).mockResolvedValueOnce({
      ok: true,
      json: async () => tiedResponse,
    } as Response);

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

    // Tiebreaker is alphabetical — "A Team" should always rank above "Z Team"
    const aTeam = records.find((r) => r.teamName === "A Team");
    const zTeam = records.find((r) => r.teamName === "Z Team");
    expect(aTeam?.leagueRank).toBe(1);
    expect(zTeam?.leagueRank).toBe(2);
  });

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

    const adapter = new MlbStandingsAdapter();
    await expect(adapter.fetchStandings()).rejects.toThrow();
  });
});