import { HttpError } from 'ra-core'

async function request(path = '', options) {
  const response = await fetch(`/api${path}`, options)
  if (!response.ok) {
    const body = await response.json().catch(() => ({}))
    throw new HttpError(body.error || `请求失败 (${response.status})`, response.status, body)
  }
  return response.status === 204 ? null : response.json()
}

const jsonOptions = (method, data) => ({
  method,
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify(data),
})

const unsupported = (resource, operation) => Promise.reject(new Error(`${resource} 不支持 ${operation}`))

const resourcePaths = {
  browsers: '/browsers',
  'browser-images': '/browser-images',
  gateways: '/gateways',
  accounts: '/phase-a/accounts',
  'network-exits': '/network-exits',
}

export const dataProvider = {
  async getList(resource) {
    const path = resourcePaths[resource]
    if (!path) return unsupported(resource, 'getList')
    const records = await request(path)
    return { data: records.map(record => ({ ...record, id: record.id ?? record.alias ?? record.version ?? record.name })), total: records.length }
  },
  async create(resource, { data }) {
    const path = resourcePaths[resource]
    if (!path) return unsupported(resource, 'create')
    const created = await request(path, jsonOptions('POST', data))
    return { data: { ...data, ...created, id: created?.alias ?? created?.version ?? created?.name ?? data.alias } }
  },
  async update(resource, { id, data }) {
    const path = resourcePaths[resource]
    if (!path || resource === 'browsers') return unsupported(resource, 'update')
    // browser-images 的 PUT 不接受 version 字段（路径已携带），透传其余字段。
    const { version: _ignored, ...rest } = data ?? {}
    await request(`${path}/${encodeURIComponent(id)}`, jsonOptions('PUT', rest))
    return { data: { ...rest, id } }
  },
  async delete(resource, { id }) {
    const path = resourcePaths[resource]
    if (!path) return unsupported(resource, 'delete')
    await request(`${path}/${encodeURIComponent(id)}`, { method: 'DELETE' })
    return { data: { id } }
  },
  getOne: resource => unsupported(resource, 'getOne'),
  getMany: resource => unsupported(resource, 'getMany'),
  getManyReference: resource => unsupported(resource, 'getManyReference'),
  updateMany: resource => unsupported(resource, 'updateMany'),
  deleteMany: resource => unsupported(resource, 'deleteMany'),
  // 环境的领域动作保持显式动词，不伪装成 CRUD update。
  async browserAction(alias, action, data) {
    if (action === 'upgrade') {
      await request(`/browsers/${encodeURIComponent(alias)}/upgrade`, jsonOptions('POST', data))
      return
    }
    const paths = {
      start: [`/browsers/${encodeURIComponent(alias)}/start`, 'POST'],
      stop: [`/browsers/${encodeURIComponent(alias)}/stop`, 'POST'],
      recycle: [`/browsers/${encodeURIComponent(alias)}`, 'DELETE'],
    }
    const target = paths[action]
    if (!target) throw new Error(`未知运行环境操作: ${action}`)
    await request(target[0], { method: target[1] })
  },
}