import { describe, it } from 'node:test';
import assert from 'node:assert/strict';
import { resolve } from 'node:path';
import { fileURLToPath } from 'node:url';
import { execFile } from 'node:child_process';
import { promisify } from 'node:util';

const exec = promisify(execFile);
const __dirname = fileURLToPath(new URL('.', import.meta.url));
const REPO = resolve(__dirname, '../..');
const CLI = resolve(REPO, 'scanners/token-hotspots-cli.mjs');
const TOKENIZER_MODULE = resolve(REPO, 'scanners/lib/tokenizer-api.mjs');
const FIXTURE = resolve(REPO, 'tests/fixtures/marketplace-large');

describe('--accurate-tokens (no API key)', () => {
  it('skips API calibration and reports calibration.skipped === "no-api-key"', async () => {
    const env = { ...process.env };
    delete env.ANTHROPIC_API_KEY;
    const { stdout, stderr } = await exec(
      'node',
      [CLI, FIXTURE, '--json', '--accurate-tokens'],
      { timeout: 30000, cwd: REPO, env },
    );
    const json = JSON.parse(stdout);
    assert.equal(json.calibration?.skipped, 'no-api-key');
    assert.match(stderr, /ANTHROPIC_API_KEY not set/i);
  });

  it('does not include calibration field when --accurate-tokens absent', async () => {
    const { stdout } = await exec('node', [CLI, FIXTURE, '--json'], {
      timeout: 30000,
      cwd: REPO,
    });
    const json = JSON.parse(stdout);
    assert.equal(json.calibration, undefined);
  });
});

describe('tokenizer-api.mjs — key masking', () => {
  it('masks API key in error messages to first 8 chars + "..."', async () => {
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-FAKEKEY-1234567890';

    const originalFetch = globalThis.fetch;
    globalThis.fetch = async () => {
      const err = new Error('network failure');
      throw err;
    };

    let threw = null;
    try {
      await tokenizerApi.callCountTokensApi('hello', fakeKey, { maxRetries: 0 });
    } catch (e) {
      threw = e;
    } finally {
      globalThis.fetch = originalFetch;
    }

    assert.ok(threw, 'expected an error to be thrown');
    assert.ok(
      !threw.message.includes('FAKEKEY-1234567890'),
      `key must NOT appear unmasked in error message; got: ${threw.message}`,
    );
    assert.ok(
      threw.message.includes('sk-ant-F'),
      `error must mention masked key prefix sk-ant-F...; got: ${threw.message}`,
    );
  });

  it('does NOT include response body in thrown errors on non-429 HTTP failure', async () => {
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-LEAKYBODY-9999';
    const echoBody = `{"error": "invalid api key sk-ant-LEAKYBODY-9999"}`;

    const originalFetch = globalThis.fetch;
    globalThis.fetch = async () => ({
      ok: false,
      status: 401,
      statusText: 'Unauthorized',
      text: async () => echoBody,
      json: async () => JSON.parse(echoBody),
    });

    let threw = null;
    try {
      await tokenizerApi.callCountTokensApi('hi', fakeKey, { maxRetries: 0 });
    } catch (e) {
      threw = e;
    } finally {
      globalThis.fetch = originalFetch;
    }

    assert.ok(threw);
    assert.ok(
      !threw.message.includes('LEAKYBODY-9999'),
      `body must NOT echo back into thrown message; got: ${threw.message}`,
    );
    assert.match(threw.message, /401/);
  });

  it('uses AbortController with a 5-second timeout', async () => {
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-TIMEOUTKEY-0000';
    let capturedSignal = null;
    const originalFetch = globalThis.fetch;
    globalThis.fetch = async (_url, init) => {
      capturedSignal = init?.signal;
      return {
        ok: true,
        status: 200,
        statusText: 'OK',
        json: async () => ({ input_tokens: 42 }),
      };
    };

    try {
      const result = await tokenizerApi.callCountTokensApi('hi', fakeKey, { maxRetries: 0 });
      assert.equal(result.input_tokens, 42);
      assert.ok(capturedSignal, 'fetch must be called with an AbortController signal');
      assert.ok(typeof capturedSignal.aborted === 'boolean');
    } finally {
      globalThis.fetch = originalFetch;
    }
  });

  it('retries on 429 with exponential backoff (max 3 retries)', async () => {
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-RETRYKEY-0000';
    let calls = 0;
    const originalFetch = globalThis.fetch;
    globalThis.fetch = async () => {
      calls++;
      if (calls <= 2) {
        return {
          ok: false,
          status: 429,
          statusText: 'Too Many Requests',
          text: async () => '',
          json: async () => ({}),
        };
      }
      return {
        ok: true,
        status: 200,
        statusText: 'OK',
        json: async () => ({ input_tokens: 100 }),
      };
    };

    try {
      const result = await tokenizerApi.callCountTokensApi('hello', fakeKey, {
        maxRetries: 3,
        backoffBaseMs: 1,
      });
      assert.equal(result.input_tokens, 100);
      assert.equal(calls, 3, 'expected 2 retries before success on third call');
    } finally {
      globalThis.fetch = originalFetch;
    }
  });

  it('sends required headers: x-api-key, anthropic-version, content-type', async () => {
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-HEADERTEST-0000';
    let capturedInit = null;
    const originalFetch = globalThis.fetch;
    globalThis.fetch = async (_url, init) => {
      capturedInit = init;
      return {
        ok: true,
        status: 200,
        statusText: 'OK',
        json: async () => ({ input_tokens: 10 }),
      };
    };

    try {
      await tokenizerApi.callCountTokensApi('hi', fakeKey, { maxRetries: 0 });
      const headers = capturedInit?.headers || {};
      assert.equal(headers['x-api-key'], fakeKey);
      assert.equal(headers['anthropic-version'], '2023-06-01');
      assert.equal(headers['content-type'], 'application/json');
    } finally {
      globalThis.fetch = originalFetch;
    }
  });
});

describe('--accurate-tokens (mocked fetch — happy path)', () => {
  it('returns input_tokens from mocked fetch response', async () => {
    // Note: the v5 plan specified `mock.method(tokenizerApi, ...)` but ESM
    // read-only bindings make that pattern unusable. We mock at the
    // globalThis.fetch boundary instead, which is the actual external
    // dependency and gives equivalent coverage. Subprocess CLI integration
    // can't carry the mock across processes, so unit-level fetch mock + the
    // no-key subprocess test are the two coverage points.
    const tokenizerApi = await import(TOKENIZER_MODULE);
    const fakeKey = 'sk-ant-MOCKED-0000';

    const originalFetch = globalThis.fetch;
    globalThis.fetch = async () => ({
      ok: true,
      status: 200,
      statusText: 'OK',
      json: async () => ({ input_tokens: 4200 }),
    });

    try {
      const result = await tokenizerApi.callCountTokensApi('hello world', fakeKey, { maxRetries: 0 });
      assert.equal(result.input_tokens, 4200);
    } finally {
      globalThis.fetch = originalFetch;
    }
  });
});
