//
// Copyright © 2020 Anticrm Platform Contributors.
//
// Licensed under the Eclipse Public License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License. You may
// obtain a copy of the License at https://www.eclipse.org/legal/epl-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
//
// See the License for the specific language governing permissions and
// limitations under the License.
//

import clientPlugin from '@hcengineering/client'
import { Client, createClient, TxHander } from '@hcengineering/core'
import { getMetadata, getPlugins, getResource } from '@hcengineering/platform'
import { connect } from './connection'

export { connect }

let client: Promise<Client> | Client | undefined

/*!
 * Anticrm Platform™ Client Plugin
 * © 2020, 2021 Anticrm Platform Contributors. All Rights Reserved.
 * Licensed under the Eclipse Public License, Version 2.0
 */
// eslint-disable-next-line @typescript-eslint/explicit-function-return-type
export default async () => {
  let _token: string | undefined

  return {
    function: {
      GetClient: async (
        token: string,
        endpoint: string,
        onUpgrade?: () => void,
        onUnauthorized?: () => void
      ): Promise<Client> => {
        if (client instanceof Promise) {
          client = await client
          await client.close()
        }
        if (token !== _token && client !== undefined) {
          client = undefined
        }
        if (client === undefined) {
          const filterModel = getMetadata(clientPlugin.metadata.FilterModel) ?? false
          client = createClient(
            (handler: TxHander) => {
              const url = new URL(`/${token}`, endpoint)
              console.log('connecting to', url.href)
              return connect(url.href, handler, onUpgrade, onUnauthorized)
            },
            filterModel ? getPlugins() : undefined
          )
          _token = token

          // Check if we had dev hook for client.
          const hook = getMetadata(clientPlugin.metadata.ClientHook)
          if (hook !== undefined) {
            const hookProc = await getResource(hook)
            const _client = client
            client = new Promise((resolve, reject) => {
              _client
                .then((res) => {
                  resolve(hookProc(res))
                })
                .catch((err) => reject(err))
            })
          }
        }
        return await client
      }
    }
  }
}