const API_URL = import.meta.env.VITE_API_URL || 'http://localhost:3000'

async function request(path, { method = 'GET', body, token, formData } = {}) {
  const headers = {}
  if (token) headers['Authorization'] = `Bearer ${token}`
  if (body && !formData) headers['Content-Type'] = 'application/json'

  const res = await fetch(`${API_URL}${path}`, {
    method,
    headers,
    body: formData ? formData : body ? JSON.stringify(body) : undefined,
  })

  const data = await res.json().catch(() => ({}))
  if (!res.ok) {
    const message = data.errors ? data.errors.join(', ') : data.error || 'Ошибка сервера'
    throw new ApiError(message, res.status)
  }
  return data
}

export function wsUrl(path = '') {
  return `${API_URL.replace(/^http/, 'ws')}${path}`
}

export class ApiError extends Error {
  constructor(message, status) {
    super(message)
    this.status = status
  }
}

export const api = {
  login: (nickname, password) =>
    request('/api/login', { method: 'POST', body: { nickname, password } }),

  register: (nickname, password, avatarFile) => {
    const formData = new FormData()
    formData.append('user[nickname]', nickname)
    formData.append('user[password]', password)
    if (avatarFile) formData.append('user[avatar]', avatarFile)
    return request('/api/register', { method: 'POST', formData })
  },

  me: (token) => request('/api/me', { token }),

  logout: (token) => request('/api/logout', { method: 'DELETE', token }),
}