// API client with JWT auth injection.
const TOKEN_KEY = 'st_token'

export function getToken() {
  return localStorage.getItem(TOKEN_KEY)
}
export function setToken(t) {
  if (t) localStorage.setItem(TOKEN_KEY, t)
  else localStorage.removeItem(TOKEN_KEY)
}

async function request(method, url, body, isForm = false) {
  const headers = {}
  const token = getToken()
  if (token) headers['Authorization'] = `Bearer ${token}`
  let payload = body
  if (!isForm && body !== undefined && body !== null) {
    headers['Content-Type'] = 'application/json'
    payload = JSON.stringify(body)
  }
  const res = await fetch(url, { method, headers, body: payload })
  let data = null
  try {
    data = await res.json()
  } catch (e) {
    /* ignore json parse errors */
  }
  if (!res.ok) {
    const msg = (data && (data.error || data.message)) || `HTTP ${res.status}`
    throw new Error(msg)
  }
  return data
}

export const api = {
  login: (username, password) => request('POST', '/api/auth/login', { username, password }),
  me: () => request('GET', '/api/auth/me'),
  setup: (b) => request('POST', '/api/auth/setup', b),
  updateProfile: (b) => request('PATCH', '/api/auth/profile', b),
  adminCreateUser: (b) => request('POST', '/api/admin/users', b),
  adminListUsers: () => request('GET', '/api/admin/users'),
  adminUpdateUser: (username, b) => request('PUT', `/api/admin/users/${username}`, b),
  createGroup: (formData) => request('POST', '/api/groups', formData, true),
  listGroups: () => request('GET', '/api/groups'),
  getGroup: (id) => request('GET', `/api/groups/${id}`),
  deleteGroup: (id) => request('DELETE', `/api/groups/${id}`),
  analyzeGroup: (id, opts = {}) => request('POST', `/api/groups/${id}/analyze${opts.append ? '?append=true' : ''}`),
  listPersonas: (gid) => request('GET', `/api/groups/${gid}/personas`),
  getPersona: (gid, pid) => request('GET', `/api/groups/${gid}/personas/${pid}`),
  updatePersona: (gid, pid, b) => request('PUT', `/api/groups/${gid}/personas/${pid}`, b),
  chatStart: (gid, pid, scenario, locale) => request('POST', `/api/chat/${gid}/personas/${pid}/chat/start`, { scenario, locale }),
  chatResume: (gid, pid) => request('GET', `/api/chat/${gid}/personas/${pid}/chat/resume`),
  chatSend: (gid, pid, text) => request('POST', `/api/chat/${gid}/personas/${pid}/chat/send`, { text }),
  chatFinish: (gid, pid) => request('POST', `/api/chat/${gid}/personas/${pid}/chat/finish`),
  mySessions: () => request('GET', '/api/chat/sessions'),
  myBoard: () => request('GET', '/api/me/board'),
  weakAreas: () => request('GET', '/api/me/weak-areas'),
  myPersonas: () => request('GET', '/api/me/personas'),
  generatePersona: (b) => request('POST', '/api/me/personas/generate', b),
  analytics: (params = {}) => {
    const qs = new URLSearchParams()
    if (params.from) qs.set('from', params.from)
    if (params.to) qs.set('to', params.to)
    const q = qs.toString()
    return request('GET', `/api/analytics${q ? `?${q}` : ''}`)
  },
}