class TestReport {
  constructor() {
    this.tests = [];
  }

  createTest(name) {
    const test = { name, result: true, messages: [] };
    this.tests.push(test);
    return test;
  }

  throwErrors() {
    const latest = this.tests[this.tests.length - 1];
    if (!latest.result) {
      const msgs = latest.messages.map(m => m.description).join('\n');
      throw new Error(`${latest.name} test failed with ${latest.messages.length} messages.\n\n${msgs}`);
    }
  }

  checkPassed(passed, message) {
    if (!passed) {
      const latest = this.tests[this.tests.length - 1];
      latest.result = false;
      latest.messages.push(message);
    }
  }

  async verifyLinks(page) {
    const links = await page.getLinks();
    for (const link of links) {
      if (link.startsWith('mailto')) continue;
      try {
        const response = await fetch(link);
        if (!response.ok) {
          this.checkPassed(false, {
            color: 'red',
            title: 'Bad Link',
            description: `${link} failed on page ${page.url} with status code ${response.status}`
          });
        }
      } catch (e) {
        this.checkPassed(false, {
          color: 'red',
          title: 'Bad Link',
          description: `${link} failed on page ${page.url} with error ${e.message}`
        });
      }
    }
  }

  didTestsPass() {
    return this.tests.every(t => t.result);
  }

  getMessages() {
    if (this.didTestsPass()) {
      return [{
        title: 'Passed',
        color: 0x00FF00,
        description: `All ${this.tests.length} tests passed.`
      }];
    }
    const messages = [];
    for (const test of this.tests) {
      for (const msg of test.messages) {
        messages.push({
          title: msg.title,
          color: parseInt(msg.color, 16),
          description: msg.description
        });
      }
    }
    return messages;
  }
}

module.exports = TestReport;