import { describe, it, expect, vi, beforeEach } from "vitest";
import { calculateReplacementLevel, calculateVORP } from "~/services/ev-calculator";
import { syncVorpForSeason } from "../participant-expected-value";

const { mockUpdate, mockSet, mockDb, mockSqlFn } = vi.hoisted(() => {
  const update = vi.fn();
  const set = vi.fn();
  const sqlFn = Object.assign(vi.fn(() => ({})), { join: vi.fn(() => ({})) });
  const db = { update, select: vi.fn() };
  return { mockUpdate: update, mockSet: set, mockDb: db, mockSqlFn: sqlFn };
});

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

vi.mock("~/database/schema", () => ({
  seasonParticipants: { id: "id" },
  seasonParticipantExpectedValues: {
    participantId: "participantId",
    sportsSeasonId: "sportsSeasonId",
  },
}));

vi.mock("drizzle-orm", () => ({
  eq: vi.fn((field, value) => ({ field, value })),
  and: vi.fn((...args) => ({ and: args })),
  count: vi.fn(() => ({ count: true })),
  sql: mockSqlFn,
}));

describe("syncVorpForSeason", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("calculates correct VORP values for 14 participants with EVs 100 down to 35 (step 5)", () => {
    // 14 participants: EVs = 100, 95, 90, 85, 80, 75, 70, 65, 60, 55, 50, 45, 40, 35
    // replacement level = avg of positions 12-14 (0-indexed 11-13) = avg(45, 40, 35) = 40
    const evValues = Array.from({ length: 14 }, (_, i) => 100 - i * 5);

    const replacementLevel = calculateReplacementLevel(evValues);
    expect(replacementLevel).toBe(40);
    expect(calculateVORP(100, replacementLevel)).toBe(60);
    expect(calculateVORP(35, replacementLevel)).toBe(-5);
  });

  it("returns early when no EVs exist for the season", async () => {
    const mockSelectChain = {
      from: vi.fn().mockReturnThis(),
      where: vi.fn().mockResolvedValue([]),
    };
    mockDb.select = vi.fn().mockReturnValue(mockSelectChain);

    await syncVorpForSeason("season-empty");

    expect(mockUpdate).not.toHaveBeenCalled();
  });

  it("calls db.update with correct vorpValue for each participant", async () => {
    // 3 participants: EVs 100, 70, 40
    // replacement level = avg of positions 12-14, clamped to [40] → 40
    // VORP: 100→60, 70→30, 40→0
    const mockEvRecords = [
      { participantId: "p1", expectedValue: "100", sportsSeasonId: "season-1" },
      { participantId: "p2", expectedValue: "70", sportsSeasonId: "season-1" },
      { participantId: "p3", expectedValue: "40", sportsSeasonId: "season-1" },
    ];

    const mockSelectChain = {
      from: vi.fn().mockReturnThis(),
      where: vi.fn().mockResolvedValue(mockEvRecords),
    };
    mockDb.select = vi.fn().mockReturnValue(mockSelectChain);

    const mockWhereResolved = vi.fn().mockResolvedValue([]);
    mockSet.mockReturnValue({ where: mockWhereResolved });
    mockUpdate.mockReturnValue({ set: mockSet });

    await syncVorpForSeason("season-1");

    expect(mockUpdate).toHaveBeenCalledTimes(1);
    expect(mockSet).toHaveBeenCalledTimes(1);
    const setArg = mockSet.mock.calls[0][0];
    expect(setArg).toHaveProperty("vorpValue");
    expect(setArg).toHaveProperty("updatedAt");
  });
});