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

const LLM_ENV_KEYS = [
  'CLI_PROXY_API', 'CLI_PROXY_API_KEY', 'CLI_PROXY_API_MODEL', 'INPUT_CLI_PROXY_API', 'INPUT_CLI_PROXY_API_KEY',
  'MODEL', 'OPENCODE_MODEL', 'INPUT_MODEL',
];

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

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

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

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

  it('ok when all required values are provided', () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    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 is 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('fetchLLMModels', () => {
  it('returns the model ids on HTTP 200', async () => {
    let capturedUrl, capturedHeaders;
    const result = await fetchLLMModels({
      baseURL: 'https://proxy.example/',
      apiKey: 'tok',
      fetchImpl: async (url, opts) => {
        capturedUrl = url;
        capturedHeaders = opts.headers;
        return { status: 200, ok: true, json: async () => ({ data: [{ id: 'gpt-5.5' }, { slug: 'gpt-5.4-mini' }, 'custom-model'] }) };
      },
    });
    assert.deepEqual(result, { ok: true, slugs: ['gpt-5.5', 'gpt-5.4-mini', 'custom-model'] });
    assert.equal(capturedUrl, 'https://proxy.example/v1/models');
    assert.equal(capturedHeaders.Authorization, 'Bearer tok');
  });

  it('reports an auth failure on HTTP 401', async () => {
    const result = await fetchLLMModels({
      baseURL: 'https://proxy.example',
      apiKey: 'revoked',
      fetchImpl: async () => ({ status: 401, ok: false, json: async () => ({}) }),
    });
    assert.equal(result.ok, false);
    assert.match(result.error, /HTTP 401/);
    assert.match(result.error, /CLIProxyAPI/);
  });

  it('fails when the base URL is missing', async () => {
    const result = await fetchLLMModels({ baseURL: '', apiKey: 'tok', fetchImpl: async () => ({ status: 200, ok: true, json: async () => ({}) }) });
    assert.equal(result.ok, false);
    assert.match(result.error, /CLI_PROXY_API/);
  });
});

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

  it('passes when the configured model is in the proxy model list', async () => {
    clearLLMEnv();
    process.env.CLI_PROXY_API = 'https://proxy.example';
    process.env.CLI_PROXY_API_KEY = 'secret';
    process.env.MODEL = 'gpt-5.4-mini';

    const result = await verifyLLM({
      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5', 'gpt-5.4-mini'] }),
    });

    assert.equal(result.ok, true);
    assert.equal(result.provider, 'cliproxyapi');
    assert.equal(result.command, null);
    assert.equal(result.model, 'gpt-5.4-mini');
    assert.deepEqual(result.models, ['gpt-5.5', 'gpt-5.4-mini']);
  });

  it('passes when no model is specified and the proxy is reachable', async () => {
    clearLLMEnv();
    process.env.CLI_PROXY_API = 'https://proxy.example';
    process.env.CLI_PROXY_API_KEY = 'secret';

    const result = await verifyLLM({
      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5', 'gpt-5.4-mini'] }),
    });

    assert.equal(result.ok, true);
    assert.equal(result.provider, 'cliproxyapi');
    assert.equal(result.command, null);
    assert.equal(result.model, null);
    assert.deepEqual(result.models, ['gpt-5.5', 'gpt-5.4-mini']);
  });

  it('fails when proxy auth is invalid', async () => {
    clearLLMEnv();
    process.env.CLI_PROXY_API = 'https://proxy.example';
    process.env.MODEL = 'gpt-5.4-mini';

    const result = await verifyLLM({
      fetchLLMModelsFn: async () => ({ ok: false, error: 'CLIProxyAPI 認證失效（HTTP 401）——API key 已被撤銷或過期，請更新 CLI_PROXY_API_KEY secret' }),
    });

    assert.equal(result.ok, false);
    assert.equal(result.provider, 'cliproxyapi');
    assert.match(result.error, /HTTP 401/);
    assert.match(result.error, /CLI_PROXY_API_KEY/);
  });

  it('fails when the configured model is not in the proxy available list', async () => {
    clearLLMEnv();
    process.env.CLI_PROXY_API = 'https://proxy.example';
    process.env.MODEL = 'gpt-9-imaginary';

    const result = await verifyLLM({
      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5', 'gpt-5.4-mini'] }),
    });

    assert.equal(result.ok, false);
    assert.match(result.error, /不在 CLIProxyAPI 可用清單/);
    assert.match(result.error, /gpt-9-imaginary/);
  });

  it('fails when the configured model name is invalid', async () => {
    clearLLMEnv();
    process.env.CLI_PROXY_API = 'https://proxy.example';
    process.env.MODEL = 'gpt-5.5; rm -rf /';

    const result = await verifyLLM({
      fetchLLMModelsFn: async () => ({ ok: true, slugs: ['gpt-5.5'] }),
    });

    assert.equal(result.ok, false);
    assert.equal(result.provider, 'cliproxyapi');
    assert.match(result.error, /無效的 model 參數/);
  });
});

describe('runPreflight', () => {
  function makeDeps(overrides = {}) {
    return {
      checkEnv: () => ({ ok: true, missing: [] }),
      verifyToken: async () => ({ ok: true }),
      verifyComment: async () => ({ ok: true }),
      verifyRemote: () => ({ ok: true }),
      verifyLLMFn: async () => ({ ok: true, provider: 'cliproxyapi', command: null, model: 'gpt-5.5', models: ['gpt-5.5'] }),
      ...overrides,
    };
  }

  it('returns false and stops early when required env is missing', async () => {
    const result = await runPreflight();
    assert.equal(result, false);
  });

  it('returns true when every verification step succeeds', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    const result = await runPreflight('/ws', makeDeps());
    assert.equal(result, true);
  });

  it('returns true when the comment token check is skipped', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    const result = await runPreflight('/ws', makeDeps({
      verifyComment: async () => ({ ok: true, skipped: true }),
    }));
    assert.equal(result, true);
  });

  it('returns false when the Gitea token check fails', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    let remoteCalled = false;
    const result = await runPreflight('/ws', makeDeps({
      verifyToken: async () => ({ ok: false, error: 'HTTP 401' }),
      verifyRemote: () => { remoteCalled = true; return { ok: true }; },
    }));
    assert.equal(result, false);
    assert.equal(remoteCalled, false, 'should stop before later checks');
  });

  it('returns false when the comment token check fails', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    const result = await runPreflight('/ws', makeDeps({
      verifyComment: async () => ({ ok: false, error: 'HTTP 401' }),
    }));
    assert.equal(result, false);
  });

  it('returns false when git remote access fails', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    let llmCalled = false;
    const result = await runPreflight('/ws', makeDeps({
      verifyRemote: () => ({ ok: false, error: 'auth failed' }),
      verifyLLMFn: async () => { llmCalled = true; return { ok: true }; },
    }));
    assert.equal(result, false);
    assert.equal(llmCalled, false, 'should stop before the LLM check');
  });

  it('returns false when LLM verification fails', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    const result = await runPreflight('/ws', makeDeps({
      verifyLLMFn: async () => ({ ok: false, error: 'CLIProxyAPI 驗證失敗' }),
    }));
    assert.equal(result, false);
  });

  it('passes the workspace through to the remote-access check', async () => {
    process.env.CLI_PROXY_API = 'https://proxy.example';
    let captured;
    await runPreflight('/custom/ws', makeDeps({
      verifyRemote: (ws) => { captured = ws; return { ok: true }; },
    }));
    assert.equal(captured, '/custom/ws');
  });
});