import { Params } from '@feathersjs/feathers/lib'

import { LocationInterface } from '@xrengine/common/src/dbmodels/Location'
import { Instance as InstanceInterface } from '@xrengine/common/src/interfaces/Instance'

import { Application } from '../../../declarations'
import authenticate from '../../hooks/authenticate'
import verifyScope from '../../hooks/verify-scope'
import logger from '../../ServerLogger'
import { Instance } from './instance.class'
import instanceDocs from './instance.docs'
import hooks from './instance.hooks'
import createModel from './instance.model'

declare module '@xrengine/common/declarations' {
  interface ServiceTypes {
    instance: Instance
    'instances-active': {
      find: ReturnType<typeof getActiveInstancesForScene>
    }
  }
}

type ActiveInstance = {
  id: string
  location: string
  currentUsers: number
}

// TODO: paginate this

export const getActiveInstancesForScene =
  (app: Application) =>
  async (params: Params & { query: { sceneId: string } }): Promise<ActiveInstance[]> => {
    const sceneId = params.query!.sceneId
    if (!sceneId) return []

    // get all locationIds for sceneId
    const locations = (await app.service('location').Model.findAll({
      where: {
        sceneId
      }
    })) as LocationInterface[]

    if (!locations) return []

    const instances = (
      (await Promise.all(
        locations.map((location) => {
          return app.service('instance').Model.findAll({
            where: {
              ended: false,
              locationId: location.id
            },
            include: [
              {
                model: app.service('location').Model,
                where: {}
              }
            ]
          })
        })
      )) as InstanceInterface[]
    ).flat()

    // return all active instances for each location
    const instancesData: ActiveInstance[] = instances
      .map((instance) => {
        return {
          id: instance.id,
          location: instance.location!.id,
          currentUsers: instance.currentUsers
        }
      })
      .filter((a) => !!a)

    return instancesData
  }

export default (app: Application) => {
  const options = {
    Model: createModel(app),
    paginate: app.get('paginate'),
    multi: true
  }

  /**
   * Initialize our service with any options it requires and docs
   */
  const event = new Instance(options, app)
  event.docs = instanceDocs
  app.use('instance', event)

  const service = app.service('instance')

  service.hooks(hooks)

  /**
   * A method used to remove specific instance
   *
   * @param data
   * @returns deleted channel
   */
  service.publish('removed', async (data): Promise<any> => {
    try {
      const admins = await app.service('user').Model.findAll({
        include: [
          {
            model: app.service('scope').Model,
            where: {
              type: 'admin:admin'
            }
          }
        ]
      })
      const targetIds = admins.map((admin) => admin.id)
      // eslint-disable-next-line @typescript-eslint/restrict-template-expressions
      return await Promise.all(
        targetIds.map((userId: string) => {
          return app.channel(`userIds/${userId}`).send({
            instance: data
          })
        })
      )
    } catch (err) {
      logger.error(err)
      throw err
    }
  })

  app.use('instances-active', {
    find: getActiveInstancesForScene(app)
  })

  app.service('instances-active').hooks({
    before: {
      find: [authenticate(), verifyScope('editor', 'write')]
    }
  })
}