import axios from 'axios'

const apiBaseURL = import.meta.env.VITE_API_BASE_URL || ''
const api = axios.create({ baseURL: `${apiBaseURL}/api/v1` })
const AUTH_PATHS = ['/auth/login', '/auth/register', '/auth/refresh']

// Attach access token to every request
api.interceptors.request.use((config) => {
  const token = localStorage.getItem('access_token')
  if (token) config.headers.Authorization = `Bearer ${token}`
  return config
})

// Auto-refresh on 401
api.interceptors.response.use(
  (res) => res,
  async (err) => {
    const original = err.config || {}
    const requestUrl = original.url || ''
    const isAuthRequest = AUTH_PATHS.some((path) => requestUrl.includes(path))

    if (err.response?.status === 401 && !original._retry && !isAuthRequest) {
      original._retry = true
      try {
        const refresh = localStorage.getItem('refresh_token')
        if (!refresh) throw new Error('Missing refresh token')
        const { data } = await axios.post(`${apiBaseURL}/api/v1/auth/refresh`, { refresh_token: refresh })
        localStorage.setItem('access_token', data.access_token)
        localStorage.setItem('refresh_token', data.refresh_token)
        original.headers.Authorization = `Bearer ${data.access_token}`
        return api(original)
      } catch {
        localStorage.clear()
        window.location.href = '/login'
      }
    }
    return Promise.reject(err)
  }
)

export function getApiErrorMessage(err, fallback = 'Something went wrong') {
  const detail = err?.response?.data?.detail
  if (typeof detail === 'string' && detail.trim()) return detail
  if (Array.isArray(detail) && detail.length) {
    return detail.map((item) => item?.msg || item).filter(Boolean).join(', ')
  }
  return fallback
}

// ─── Auth ──────────────────────────────────────────────────────────────────────
export const authApi = {
  register: (d) => api.post('/auth/register', d).then(r => r.data),
  login: (d) => api.post('/auth/login', d).then(r => r.data),
  me: () => api.get('/auth/me').then(r => r.data),
}

// ─── Conversations ─────────────────────────────────────────────────────────────
export const convApi = {
  list: () => api.get('/conversations').then(r => r.data),
  create: (title = 'New Chat') => api.post('/conversations', { title }).then(r => r.data),
  messages: (id) => api.get(`/conversations/${id}/messages`).then(r => r.data),
  rename: (id, title) => api.patch(`/conversations/${id}`, { title }).then(r => r.data),
  delete: (id) => api.delete(`/conversations/${id}`),
}

// ─── Query ─────────────────────────────────────────────────────────────────────
export const queryApi = {
  ask: (payload) => api.post('/query', payload).then(r => r.data),
}

export const audioApi = {
  transcribe: (formData) => api.post('/audio/transcribe', formData, {
    headers: { 'Content-Type': 'multipart/form-data' }
  }).then(r => r.data),
  speak: (payload) => api.post('/audio/speak', payload, {
    responseType: 'blob',
  }).then(r => r.data),
}

// ─── Documents ─────────────────────────────────────────────────────────────────
export const docsApi = {
  list: (conversationId) => api.get('/documents', {
    params: conversationId ? { conversation_id: conversationId } : undefined,
  }).then(r => r.data),
  upload: (formData) => api.post('/documents/upload', formData, {
    headers: { 'Content-Type': 'multipart/form-data' }
  }).then(r => r.data),
  clearConversation: (conversationId) => api.delete(`/documents/conversation/${conversationId}`),
  delete: (id) => api.delete(`/documents/${id}`),
}

// ─── Admin ─────────────────────────────────────────────────────────────────────
export const adminApi = {
  stats: () => api.get('/admin/stats').then(r => r.data),
  users: () => api.get('/admin/users').then(r => r.data),
  setRole: (id, role) => api.patch(`/admin/users/${id}/role`, null, { params: { role } }).then(r => r.data),
  toggle: (id) => api.patch(`/admin/users/${id}/toggle`).then(r => r.data),
}

// ─── Health ────────────────────────────────────────────────────────────────────
export const healthApi = {
  check: () => api.get('/health').then(r => r.data),
}

export default api