// API client — english platform
const API = (() => {
  const BASE = '/api';

  function getToken() { return localStorage.getItem('ep_token'); }
  function getUser() { try { return JSON.parse(localStorage.getItem('ep_user')); } catch { return null; } }
  function setAuth(token, user) { localStorage.setItem('ep_token', token); localStorage.setItem('ep_user', JSON.stringify(user)); }
  function clearAuth() { localStorage.removeItem('ep_token'); localStorage.removeItem('ep_user'); }

  async function req(method, path, body, isFormData = false) {
    const headers = { Authorization: `Bearer ${getToken()}` };
    if (!isFormData) headers['Content-Type'] = 'application/json';
    const opts = { method, headers };
    if (body) opts.body = isFormData ? body : JSON.stringify(body);
    const res = await fetch(BASE + path, opts);
    const data = await res.json().catch(() => ({}));
    if (!res.ok) throw new Error(data.error || `Erro ${res.status}`);
    return data;
  }

  return {
    getToken, getUser, setAuth, clearAuth,
    isLoggedIn: () => !!getToken(),
    isTeacher: () => { const u = getUser(); return u && (u.role === 'teacher' || u.role === 'admin'); },

    // Auth
    login: (email, password) => req('POST', '/auth/login', { email, password }),
    forgotPassword: (email) => req('POST', '/auth/forgot-password', { email }),
    resetPassword: (token, password) => req('POST', '/auth/reset-password', { token, password }),
    changePassword: (currentPassword, newPassword) => req('POST', '/auth/change-password', { currentPassword, newPassword }),

    // Users
    me: () => req('GET', '/users/me'),
    getStudents: () => req('GET', '/users/students'),
    createStudent: (data) => req('POST', '/users/create', data),
    toggleStudent: (id) => req('PUT', `/users/${id}/toggle`),
    resetStudentPassword: (id, password) => req('PUT', `/users/${id}/reset-password`, { password }),
    getNotifications: () => req('GET', '/users/notifications'),
    getNotifCount: () => req('GET', '/users/notifications/count'),
    markNotifsRead: () => req('PUT', '/users/notifications/read'),

    // Homework
    myHomework: () => req('GET', '/homework/my'),
    submitHomework: (data) => req('POST', '/homework/submit', data),
    getSubmissions: (params = {}) => {
      const q = new URLSearchParams(params).toString();
      return req('GET', `/homework/submissions${q ? '?' + q : ''}`);
    },
    getSubmission: (id) => req('GET', `/homework/submission/${id}`),
    reviewHomework: (id, grade, feedback) => req('POST', `/homework/review/${id}`, { grade, feedback }),
    assignHomework: (data) => req('POST', '/homework/assign', data),

    // Recordings
    myRecordings: () => req('GET', '/recordings/my'),
    getAllRecordings: (params = {}) => {
      const q = new URLSearchParams(params).toString();
      return req('GET', `/recordings/all${q ? '?' + q : ''}`);
    },
    reviewRecording: (id, formData) => req('POST', `/recordings/review/${id}`, formData, true),
    audioUrl: (audioPath) => `/api/recordings/audio/${audioPath}`,
    requestRerecord: (id, fd) => req('POST', `/recordings/request-rerecord/${id}`, fd, true),

    submitRecording: (formData) => req('POST', '/recordings/submit', formData, true),
    deleteRecording: (id) => req('DELETE', `/recordings/delete/${id}`),
    deleteSubmission: (id) => req('DELETE', `/homework/submission/${id}`),
    // Materials
    getMaterials: () => req('GET', '/materials'),
    createMaterial: (data) => req('POST', '/materials', data),
    updateMaterial: (id, data) => req('PUT', `/materials/${id}`, data),
    deleteMaterial: (id) => req('DELETE', `/materials/${id}`),
    sendMaterial: (id, student_ids) => req('POST', `/materials/${id}/send`, { student_ids }),
    getMyMaterials: () => req('GET', '/materials/my'),
    readMaterial: (id) => req('POST', `/materials/${id}/read`),
    getMaterialDoubts: (id, student_id) => req('GET', `/materials/${id}/doubts${student_id ? '?student_id='+student_id : ''}`),
    sendMaterialDoubt: (id, data) => req('POST', `/materials/${id}/doubts`, data),
    getMaterialDoubtStudents: (id) => req('GET', `/materials/${id}/doubt-students`),
    getMaterialStudents: () => req('GET', '/materials/students/list'),
    uploadMaterialImage: (formData) => req('POST', '/materials/upload-image', formData, true),
  };
})();

window.API = API;