'use strict'

const BaseOperation = require('./base_operation')
const messages = require('./messages')
const names = require('./names')
const CREATE_PARAMS = ['relpath', 'operation', 'action']

class Routes extends BaseOperation {
  static get routeMgmtApiPath () {
    return 'experimental/web/whisk.system/routemgmt'
  }

  list (options) {
    options = options || {}
    const qs = this.qs(options, ['relpath', 'basepath', 'operation', 'limit', 'skip'])
    return this.client.request('GET', `${Routes.routeMgmtApiPath}/getApi.json`, { qs })
  }

  delete (options) {
    if (!options || !options.hasOwnProperty('basepath')) {
      throw new Error(messages.MISSING_BASEPATH_ERROR)
    }

    const qs = this.qs(options, ['relpath', 'basepath', 'operation'])
    qs.force = true
    return this.client.request('DELETE', `${Routes.routeMgmtApiPath}/deleteApi.json`, { qs })
  }

  create (options) {
    const missing = CREATE_PARAMS.filter(param => !(options || {}).hasOwnProperty(param))

    if (missing.length) {
      throw new Error(`Missing mandatory parameters: ${missing.join(', ')}`)
    }

    const body = this.route_swagger_definition(options)
    return this.client.request('POST', `${Routes.routeMgmtApiPath}/createApi.json`, { body })
  }

  route_swagger_definition (params) {
    const apidoc = {
      namespace: '_',
      gatewayBasePath: this.route_base_path(params),
      gatewayPath: params.relpath,
      gatewayMethod: params.operation,
      id: `API:_:${this.route_base_path(params)}`,
      action: this.route_swagger_action(params)
   }

    return { apidoc }
  }

  route_swagger_action (params) {
    const id = names.parse_id(params.action)
    let namespace = decodeURIComponent(this.namespace(params))
    if (params.action.startsWith('/')) {
      namespace = names.parse_namespace(params.action)
    }
    return {
      name: id,
      namespace: namespace,
      backendMethod: 'POST',
      backendUrl: this.action_url_path(id, namespace),
      authkey: this.client.options.api_key
    }
  }

  route_base_path (params) {
    return params.basepath || '/'
  }

  action_url_path (id, namespace) {
    const path = `namespaces/${namespace}/actions/${id}`
    return this.client.path_url(path)
  }
}

module.exports = Routes