import { describe, expect, it, vi } from 'vitest';
import { type Cache, MemoryCache, NoopCache, SocialhoseClient, SocialhoseError, type Mention } from '../src/index';

const ok = (body: unknown, status = 200) =>
  new Response(JSON.stringify(body), { status, headers: { 'content-type': 'application/json' } });

const paginated = (results: unknown[], count?: number) =>
  ok({ count: count ?? results.length, next: null, previous: null, results });

function makeMention(overrides: Partial<Mention> = {}): Mention {
  return {
    id: 'mid',
    platform: 'twitter',
    campaign_id: 'cid',
    campaign_name: 'test',
    classification: 'news',
    content: 'hello',
    title: null,
    url: 'https://example.com',
    sentiment: 'positive',
    sentiment_score: 0.8,
    engagement_count: 10,
    likes: 5,
    shares: 3,
    comments: 2,
    views_count: 100,
    has_media: false,
    hashtags: [],
    keywords_matched: [],
    language: 'en',
    country: null,
    published_at: '2026-05-29T00:00:00Z',
    author: { name: 'Alice', handle: '@alice', avatar_url: null, url: null, followers: 100, verified: false },
    ...overrides,
  };
}

// ---------- existing tests ----------

describe('SocialhoseClient', () => {
  it('sends Api-Key auth, browser-like user-agent, and query params', async () => {
    const fetchMock = vi.fn(async () => ok({ count: 0, next: null, previous: null, results: [] }));
    const client = new SocialhoseClient({ apiKey: 'test-key', fetch: fetchMock, cacheTtlMs: 0 });

    await client.getMentions({ page: 2, platforms: 'twitter', content_search: 'hospital' });

    expect(fetchMock).toHaveBeenCalledTimes(1);
    const [url, init] = fetchMock.mock.calls[0] as unknown as [string, RequestInit];
    expect(url).toBe(
      'https://socialhose.net/api/public/v1/mentions/?page=2&platforms=twitter&content_search=hospital',
    );
    expect(init.headers).toMatchObject({
      Authorization: 'Api-Key test-key',
      Accept: 'application/json',
    });
    expect((init.headers as Record<string, string>)['User-Agent']).toContain('Mozilla/5.0');
  });

  it('caches identical GET requests inside the configured TTL', async () => {
    const fetchMock = vi.fn(async () => ok({ count: 1, next: null, previous: null, results: [] }));
    const client = new SocialhoseClient({ apiKey: 'test-key', fetch: fetchMock, cacheTtlMs: 60_000 });

    await client.getMentions({ page: 1 });
    await client.getMentions({ page: 1 });

    expect(fetchMock).toHaveBeenCalledTimes(1);
  });

  it('retries rate limits and transient server failures', async () => {
    const fetchMock = vi
      .fn()
      .mockResolvedValueOnce(new Response('rate limited', { status: 429 }))
      .mockResolvedValueOnce(new Response('bad gateway', { status: 502 }))
      .mockResolvedValueOnce(ok({ results: [] }));
    const client = new SocialhoseClient({
      apiKey: 'test-key',
      fetch: fetchMock,
      cacheTtlMs: 0,
      retryDelayMs: () => 0,
    });

    const campaigns = await client.getCampaigns();

    expect(campaigns).toEqual([]);
    expect(fetchMock).toHaveBeenCalledTimes(3);
  });

  it('throws a structured SocialhoseError for non-ok responses', async () => {
    const fetchMock = vi.fn(async () => new Response('{"detail":"forbidden"}', { status: 403 }));
    const client = new SocialhoseClient({ apiKey: 'test-key', fetch: fetchMock, cacheTtlMs: 0 });

    await expect(client.getCampaign('abc')).rejects.toMatchObject({
      name: 'SocialhoseError',
      status: 403,
      path: '/campaigns/abc/',
    } satisfies Partial<SocialhoseError>);
  });

  it('normalizes mailing-list invite outcomes', async () => {
    const fetchMock = vi.fn(async () => ok({ detail: 'already invited' }, 409));
    const client = new SocialhoseClient({ apiKey: 'test-key', fetch: fetchMock });

    await expect(client.inviteMailingListMember('list-1', { email: 'a@example.com' })).resolves.toEqual({
      outcome: 'already',
      detail: 'already invited',
    });
  });

  it('defers missing apiKey errors until the first request', async () => {
    const client = new SocialhoseClient({ apiKey: '', fetch: vi.fn() });

    await expect(client.getCampaigns()).rejects.toThrow('Socialhose apiKey is required');
  });
});

// ---------- MemoryCache ----------

describe('MemoryCache', () => {
  it('returns undefined for missing key', async () => {
    const cache = new MemoryCache();
    expect(await cache.get('k')).toBeUndefined();
  });

  it('returns stored value within TTL', async () => {
    const cache = new MemoryCache();
    await cache.set('k', { data: 42 }, 60_000);
    expect(await cache.get('k')).toEqual({ data: 42 });
  });

  it('returns undefined after TTL expires', async () => {
    const cache = new MemoryCache();
    await cache.set('k', 'v', 1); // 1 ms TTL
    await new Promise((r) => setTimeout(r, 10));
    expect(await cache.get('k')).toBeUndefined();
  });

  it('deletes a stored entry', async () => {
    const cache = new MemoryCache();
    await cache.set('k', 'v', 60_000);
    await cache.delete('k');
    expect(await cache.get('k')).toBeUndefined();
  });
});

// ---------- NoopCache ----------

describe('NoopCache', () => {
  it('always returns undefined regardless of what was set', async () => {
    const cache = new NoopCache();
    await cache.set('k', 'v', 60_000);
    expect(await cache.get('k')).toBeUndefined();
  });
});

// ---------- injectable cache ----------

describe('injectable cache', () => {
  it('uses provided cache instead of internal map', async () => {
    const mockCache: Cache = {
      get: vi.fn().mockResolvedValue(undefined),
      set: vi.fn().mockResolvedValue(undefined),
      delete: vi.fn().mockResolvedValue(undefined),
    };
    const fetchMock = vi.fn(async () => paginated([]));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cache: mockCache });

    await client.getMentions({});

    expect(mockCache.get).toHaveBeenCalled();
    expect(mockCache.set).toHaveBeenCalled();
    expect(fetchMock).toHaveBeenCalledTimes(1);
  });

  it('returns cached value from injected cache without fetching', async () => {
    const cached = { count: 99, next: null, previous: null, results: [] };
    const mockCache: Cache = {
      get: vi.fn().mockResolvedValue(cached),
      set: vi.fn().mockResolvedValue(undefined),
      delete: vi.fn().mockResolvedValue(undefined),
    };
    const fetchMock = vi.fn();
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cache: mockCache });

    const result = await client.getMentions({});

    expect(result).toEqual(cached);
    expect(fetchMock).not.toHaveBeenCalled();
  });
});

// ---------- getEntityBrief ----------

describe('getEntityBrief', () => {
  it('derives sentiment and platform mix from sample', async () => {
    const results = [
      makeMention({ sentiment: 'positive', platform: 'twitter' }),
      makeMention({ sentiment: 'negative', platform: 'reddit' }),
      makeMention({ sentiment: 'positive', platform: 'twitter' }),
    ];
    const fetchMock = vi.fn(async () => paginated(results, 3));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0 });

    const brief = await client.getEntityBrief('ozempic');

    expect(brief.term).toBe('ozempic');
    expect(brief.total).toBe(3);
    expect(brief.exact).toBe(true); // count (3) <= sample.length (3)
    expect(brief.sentiment).toEqual({ positive: 2, negative: 1, neutral: 0 });
    expect(brief.platformMix[0]).toEqual({ platform: 'twitter', count: 2 });
    expect(brief.platformMix[1]).toEqual({ platform: 'reddit', count: 1 });
    expect(brief.sample).toHaveLength(3);
  });

  it('marks exact=false when total exceeds sample length', async () => {
    const results = [makeMention()];
    const fetchMock = vi.fn(async () => paginated(results, 500));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0 });

    const brief = await client.getEntityBrief('hospital');

    expect(brief.total).toBe(500);
    expect(brief.exact).toBe(false);
  });
});

// ---------- getEntityStats best-effort ----------

describe('getEntityStats', () => {
  it('sub-request failures do not zero out the entity', async () => {
    const briefResults = [makeMention({ sentiment: 'positive', platform: 'twitter' })];
    let callCount = 0;
    const fetchMock = vi.fn(async () => {
      callCount++;
      if (callCount === 1) return paginated(briefResults, 1);
      return new Response('error', { status: 502 });
    });
    const client = new SocialhoseClient({
      apiKey: 'key',
      fetch: fetchMock,
      cacheTtlMs: 0,
      retries: 0,
    });

    const stats = await client.getEntityStats('ozempic');

    // Brief data is always present
    expect(stats.term).toBe('ozempic');
    expect(stats.total).toBe(1);
    // Falls back to brief's sample sentiment
    expect(stats.sentiment).toEqual({ positive: 1, negative: 0, neutral: 0 });
    // Sub-requests failed: recent is empty, sparkline is empty
    expect(stats.recent).toEqual([]);
    expect(stats.sparkline).toEqual([]);
    expect(stats.momentumPct).toBeNull();
  });

  it('uses exact sentiment when facets reconcile with total', async () => {
    const briefResults = [
      makeMention({ sentiment: 'positive' }),
      makeMention({ sentiment: 'negative' }),
    ];
    const fetchMock = vi.fn(async (url) => {
      if ((url as string).includes('ordering=-engagement_count')) return paginated(briefResults, 2);
      if ((url as string).includes('ordering=-published_at')) return paginated([], 2);
      if ((url as string).includes('date_from=')) return paginated([], 0);
      if ((url as string).includes('sentiments=positive')) return paginated([], 1);
      if ((url as string).includes('sentiments=negative')) return paginated([], 1);
      if ((url as string).includes('sentiments=neutral')) return paginated([], 0);
      if ((url as string).includes('platforms=')) return paginated([], 0);
      return paginated([], 0);
    });
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    const stats = await client.getEntityStats('flu');

    // Exact split: 1+1+0=2 == total(2) → use exact
    expect(stats.sentiment).toEqual({ positive: 1, negative: 1, neutral: 0 });
    expect(stats.exact).toBe(true);
  });

  it('falls back to brief sentiment when facets do not reconcile', async () => {
    const briefResults = [
      makeMention({ sentiment: 'positive' }),
      makeMention({ sentiment: 'positive' }),
    ];
    const fetchMock = vi.fn(async (url) => {
      if ((url as string).includes('ordering=-engagement_count')) return paginated(briefResults, 2);
      if ((url as string).includes('ordering=-published_at')) return paginated([], 2);
      if ((url as string).includes('date_from=')) return paginated([], 0);
      // Facets sum to 5, total is 2 → mismatch
      if ((url as string).includes('sentiments=positive')) return paginated([], 3);
      if ((url as string).includes('sentiments=negative')) return paginated([], 1);
      if ((url as string).includes('sentiments=neutral')) return paginated([], 1);
      if ((url as string).includes('platforms=')) return paginated([], 0);
      return paginated([], 0);
    });
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    const stats = await client.getEntityStats('flu');

    // Facets don't reconcile → fall back to brief's sample sentiment
    expect(stats.sentiment).toEqual({ positive: 2, negative: 0, neutral: 0 });
  });
});

// ---------- exact sentiment reconciliation ----------

describe('getExactSentiment (via private access)', () => {
  it('returns null when facets sum exceeds total', async () => {
    const fetchMock = vi.fn()
      .mockResolvedValueOnce(paginated([], 6))  // positive
      .mockResolvedValueOnce(paginated([], 3))  // negative
      .mockResolvedValueOnce(paginated([], 4)); // neutral — sum=13 ≠ 10
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const result = await (client as any).getExactSentiment('term', undefined, 10);
    expect(result).toBeNull();
  });

  it('returns the split when facets sum exactly equals total', async () => {
    const fetchMock = vi.fn()
      .mockResolvedValueOnce(paginated([], 4))  // positive
      .mockResolvedValueOnce(paginated([], 3))  // negative
      .mockResolvedValueOnce(paginated([], 3)); // neutral — sum=10 == 10
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const result = await (client as any).getExactSentiment('term', undefined, 10);
    expect(result).toEqual({ positive: 4, negative: 3, neutral: 3 });
  });

  it('returns null when a facet request fails', async () => {
    const fetchMock = vi.fn()
      .mockResolvedValueOnce(paginated([], 4))
      .mockResolvedValueOnce(new Response('error', { status: 500 }))
      .mockResolvedValueOnce(paginated([], 3));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const result = await (client as any).getExactSentiment('term', undefined, 10);
    expect(result).toBeNull();
  });
});

// ---------- cumulative timeline differencing ----------

describe('getEntityTimeline (via private access)', () => {
  it('produces correct daily counts via cumulative differencing', async () => {
    // days=3 → offsets = [-2, -1, 0, 1], 4 boundary requests
    const today = new Date();
    const computeDay = (offset: number) => {
      const d = new Date(today);
      d.setUTCDate(d.getUTCDate() + offset);
      return d.toISOString().slice(0, 10);
    };

    const cumCounts: Record<string, number> = {
      [computeDay(-2)]: 30,
      [computeDay(-1)]: 20,
      [computeDay(0)]: 5,
      [computeDay(1)]: 0,
    };

    const fetchMock = vi.fn(async (url) => {
      const dateFrom = new URL(url).searchParams.get('date_from') ?? '';
      return paginated([], cumCounts[dateFrom] ?? 0);
    });

    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const timeline = await (client as any).getEntityTimeline('term', undefined, 100, 3);

    expect(timeline).toHaveLength(3);
    // day -2: 30 - 20 = 10
    // day -1: 20 - 5  = 15
    // day  0:  5 - 0  = 5
    const find = (offset: number) =>
      (timeline as { date: string; count: number }[]).find((p) => p.date === computeDay(offset));
    expect(find(-2)?.count).toBe(10);
    expect(find(-1)?.count).toBe(15);
    expect(find(0)?.count).toBe(5);
  });

  it('returns [] when earliest cumulative exceeds total (filter was ignored)', async () => {
    const today = new Date();
    const computeDay = (offset: number) => {
      const d = new Date(today);
      d.setUTCDate(d.getUTCDate() + offset);
      return d.toISOString().slice(0, 10);
    };

    // Earliest boundary returns 200, total is 50 → filter was ignored
    const fetchMock = vi.fn(async (url) => {
      const dateFrom = new URL(url).searchParams.get('date_from');
      const count = dateFrom === computeDay(-2) ? 200 : 50;
      return paginated([], count);
    });

    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    const timeline = await (client as any).getEntityTimeline('term', undefined, 50, 3);

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

// ---------- getCampaignIdByMatch ----------

describe('getCampaignIdByMatch', () => {
  it('returns the id of the first campaign whose name contains the match', async () => {
    const campaigns = [
      { id: 'c1', name: 'Sudan Watch', description: '', status: 'active', campaign_type: 'monitoring', platforms: [], tags: [] },
      { id: 'c2', name: 'Health Monitor', description: '', status: 'active', campaign_type: 'monitoring', platforms: [], tags: [] },
    ];
    const fetchMock = vi.fn(async () => paginated(campaigns, 2));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0 });

    expect(await client.getCampaignIdByMatch('health')).toBe('c2');
    expect(await client.getCampaignIdByMatch('sudan')).toBe('c1');
  });

  it('returns undefined when no campaign matches', async () => {
    const campaigns = [
      { id: 'c1', name: 'Sudan Watch', description: '', status: 'active', campaign_type: 'monitoring', platforms: [], tags: [] },
    ];
    const fetchMock = vi.fn(async () => paginated(campaigns, 1));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0 });

    expect(await client.getCampaignIdByMatch('nonexistent')).toBeUndefined();
  });

  it('returns undefined when getCampaigns fails', async () => {
    const fetchMock = vi.fn(async () => new Response('error', { status: 500 }));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    expect(await client.getCampaignIdByMatch('health')).toBeUndefined();
  });
});

// ---------- getEntityBriefs bounded concurrency ----------

describe('getEntityBriefs', () => {
  it('processes all terms and returns a map', async () => {
    const fetchMock = vi.fn(async () => paginated([makeMention()], 1));
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    const result = await client.getEntityBriefs(['a', 'b', 'c', 'd', 'e']);

    expect(result.size).toBe(5);
    for (const t of ['a', 'b', 'c', 'd', 'e']) expect(result.has(t)).toBe(true);
  });

  it('silently skips terms that fail', async () => {
    let callCount = 0;
    const fetchMock = vi.fn(async () => {
      callCount++;
      if (callCount === 2) return new Response('error', { status: 500 });
      return paginated([makeMention()], 1);
    });
    // concurrency=1 makes order deterministic: a, b (fails), c
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    const result = await client.getEntityBriefs(['a', 'b', 'c'], undefined, 1);

    expect(result.size).toBe(2);
    expect(result.has('a')).toBe(true);
    expect(result.has('b')).toBe(false);
    expect(result.has('c')).toBe(true);
  });

  it('respects bounded concurrency', async () => {
    let inFlight = 0;
    let maxInFlight = 0;

    const fetchMock = vi.fn(async () => {
      inFlight++;
      maxInFlight = Math.max(maxInFlight, inFlight);
      // Yield to allow other workers to start
      await new Promise((r) => setTimeout(r, 5));
      inFlight--;
      return paginated([makeMention()], 1);
    });

    const terms = Array.from({ length: 10 }, (_, i) => `term${i}`);
    const client = new SocialhoseClient({ apiKey: 'key', fetch: fetchMock, cacheTtlMs: 0, retries: 0 });

    await client.getEntityBriefs(terms, undefined, 3);

    expect(maxInFlight).toBeLessThanOrEqual(3);
    expect(fetchMock).toHaveBeenCalledTimes(10);
  });
});