const BASE_URL = 'http://127.0.0.1:12345';

async function request(path, params = {}) {
  const url = new URL(BASE_URL + path);
  Object.keys(params).forEach(key => {
    if (params[key] !== undefined && params[key] !== null && params[key] !== '') {
      url.searchParams.append(key, params[key]);
    }
  });

  try {
    const res = await fetch(url.toString());
    if (!res.ok) throw new Error('HTTP ' + res.status);
    const data = await res.json();
    return data;
  } catch (e) {
    console.error('请求失败:', url.toString(), e);
    throw e;
  }
}

const API = {
  getStudentsByAgeRange: (n, m, minAge, maxAge) =>
    request('/basic-information', { n, m, min_age: minAge, max_age: maxAge }),

  getClassInfo: (classId) =>
    request('/basic-information/' + classId),

  getAllClassStats: () =>
    request('/class-stats'),

  getStudentsByScore: (n, m, score) =>
    request('/scores', { n, m, score }),

  getNoPassStudents: (n, m, failCount) =>
    request('/scores_no_pass', { n, m, fail_count: failCount }),

  getClassExamAvg: (n, m) =>
    request('/scores_avg', { n, m }),

  getSalaryTop: (m = 5) =>
    request('/salary_top', { m }),

  getTimeSize: (n, m) =>
    request('/time_size', { n, m }),

  getClassAvgTimeSize: (n, m) =>
    request('/class_avg_time_size', { n, m })
};