import { describe, it, afterEach, mock } from 'node:test';
import assert from 'node:assert/strict';
import axios from 'axios';
import { checkRequiredEnv, verifyGiteaToken, verifyCommentToken, verifyLLM, runPreflight } from './preflight.js';

const LLM_ENV_KEYS = [
  'OPENAI_API_KEY', 'OPENAI_BASE_URL', 'OPENAI_MODEL',
  'CLAUDE_API_KEY', 'CLAUDE_BASE_URL', 'CLAUDE_MODEL',
  'GEMINI_API_KEY', 'GEMINI_BASE_URL', 'GEMINI_MODEL',
  'OLLAMA_BASE_URL', 'OLLAMA_MODEL',
  'AMAZONQ_API_KEY', 'AMAZONQ_BASE_URL', 'AMAZONQ_MODEL',
];

function clearLLMEnv() {
  for (const k of LLM_ENV_KEYS) delete process.env[k];
}

afterEach(() => {
  mock.restoreAll();
  clearLLMEnv();
});

describe('checkRequiredEnv', () => {
  it('reports all three missing when nothing provided', () => {
    const result = checkRequiredEnv({ token: '', repo: '', pr: '' });
    assert.equal(result.ok, false);
    assert.deepEqual(result.missing, ['GITEA_TOKEN', 'GITEA_REPOSITORY', 'PR_NUMBER']);
  });

  it('reports only the missing ones', () => {
    const result = checkRequiredEnv({ token: 't', repo: '', pr: '5' });
    assert.equal(result.ok, false);
    assert.deepEqual(result.missing, ['GITEA_REPOSITORY']);
  });

  it('ok when all provided', () => {
    const result = checkRequiredEnv({ token: 't', repo: 'owner/repo', pr: '5' });
    assert.equal(result.ok, true);
    assert.deepEqual(result.missing, []);
  });
});

describe('verifyGiteaToken', () => {
  it('ok when repo endpoint returns successfully', async () => {
    let capturedUrl, capturedOpts;
    mock.method(axios, 'get', async (url, opts) => {
      capturedUrl = url;
      capturedOpts = opts;
      return { data: { full_name: 'owner/repo' } };
    });
    const result = await verifyGiteaToken('tok', 'owner/repo');
    assert.equal(result.ok, true);
    assert.ok(capturedUrl.includes('/api/v1/repos/owner/repo'));
    assert.equal(capturedOpts.headers['Authorization'], 'token tok');
  });

  it('fails with HTTP status when token is invalid', async () => {
    mock.method(axios, 'get', async () => {
      const e = new Error('Unauthorized');
      e.response = { status: 401 };
      throw e;
    });
    const result = await verifyGiteaToken('bad', 'owner/repo');
    assert.equal(result.ok, false);
    assert.match(result.error, /HTTP 401/);
  });
});

describe('verifyCommentToken', () => {
  it('skips when no comment token provided', async () => {
    const result = await verifyCommentToken('');
    assert.deepEqual(result, { ok: true, skipped: true });
  });

  it('ok when /user returns successfully', async () => {
    let capturedUrl, capturedOpts;
    mock.method(axios, 'get', async (url, opts) => {
      capturedUrl = url;
      capturedOpts = opts;
      return { data: { login: 'bot' } };
    });
    const result = await verifyCommentToken('ctok');
    assert.equal(result.ok, true);
    assert.ok(capturedUrl.endsWith('/api/v1/user'));
    assert.equal(capturedOpts.headers['Authorization'], 'token ctok');
  });

  it('fails when comment token is invalid', async () => {
    mock.method(axios, 'get', async () => {
      const e = new Error('Unauthorized');
      e.response = { status: 401 };
      throw e;
    });
    const result = await verifyCommentToken('bad');
    assert.equal(result.ok, false);
    assert.match(result.error, /HTTP 401/);
  });
});

describe('verifyLLM', () => {
  it('fails when no provider/key configured', async () => {
    clearLLMEnv();
    const result = await verifyLLM();
    assert.equal(result.ok, false);
    assert.match(result.error, /未設定/);
  });

  it('ok when an OpenAI-compatible key authenticates', async () => {
    clearLLMEnv();
    process.env.OPENAI_API_KEY = 'k1,k2';
    let capturedUrl, capturedPayload, capturedHeaders;
    mock.method(axios, 'post', async (url, payload, opts) => {
      capturedUrl = url;
      capturedPayload = payload;
      capturedHeaders = opts.headers;
      return { data: { choices: [{ message: { content: 'ok' } }] } };
    });
    const result = await verifyLLM();
    assert.equal(result.ok, true);
    assert.equal(result.provider, 'openai');
    assert.equal(result.keyIndex, 1);
    assert.equal(result.total, 2);
    assert.ok(capturedUrl.endsWith('/chat/completions'));
    assert.equal(capturedPayload.max_tokens, 1);
    assert.equal(capturedHeaders['Authorization'], 'Bearer k1');
  });

  it('tries the next key when the first one fails', async () => {
    clearLLMEnv();
    process.env.OPENAI_API_KEY = 'bad,good';
    let calls = 0;
    mock.method(axios, 'post', async (_url, _payload, opts) => {
      calls += 1;
      if (opts.headers['Authorization'] === 'Bearer bad') throw new Error('401');
      return { data: { choices: [{ message: { content: 'ok' } }] } };
    });
    const result = await verifyLLM();
    assert.equal(result.ok, true);
    assert.equal(result.keyIndex, 2);
    assert.equal(calls, 2);
  });

  it('fails when all keys fail', async () => {
    clearLLMEnv();
    process.env.OPENAI_API_KEY = 'k1,k2';
    mock.method(axios, 'post', async () => { throw new Error('401'); });
    const result = await verifyLLM();
    assert.equal(result.ok, false);
    assert.match(result.error, /所有 2 把 openai API Key 驗證失敗/);
  });

  it('sets anthropic-version header for claude', async () => {
    clearLLMEnv();
    process.env.CLAUDE_API_KEY = 'ck';
    let capturedHeaders;
    mock.method(axios, 'post', async (_url, _payload, opts) => {
      capturedHeaders = opts.headers;
      return { data: { choices: [{ message: { content: 'ok' } }] } };
    });
    const result = await verifyLLM();
    assert.equal(result.ok, true);
    assert.equal(result.provider, 'claude');
    assert.equal(capturedHeaders['anthropic-version'], '2023-06-01');
  });

  it('checks base URL connectivity for ollama (no key)', async () => {
    clearLLMEnv();
    process.env.OLLAMA_BASE_URL = 'http://ollama.local/v1';
    let capturedUrl;
    mock.method(axios, 'get', async (url) => {
      capturedUrl = url;
      return { data: { data: [] } };
    });
    const result = await verifyLLM();
    assert.equal(result.ok, true);
    assert.equal(result.provider, 'ollama');
    assert.ok(capturedUrl.endsWith('/models'));
  });

  it('fails when ollama base URL is unreachable', async () => {
    clearLLMEnv();
    process.env.OLLAMA_BASE_URL = 'http://ollama.local/v1';
    mock.method(axios, 'get', async () => { throw new Error('ECONNREFUSED'); });
    const result = await verifyLLM();
    assert.equal(result.ok, false);
    assert.match(result.error, /無法連線/);
  });
});

describe('runPreflight', () => {
  it('returns false and stops early when required env is missing', async () => {
    // Config constants default to empty in the test environment, so the
    // required-env check fails before any network call is attempted.
    const result = await runPreflight();
    assert.equal(result, false);
  });
});