import { Plugin, StoragePlugin } from '../../core/src/plugin'
import Storage from './Storage'

type PluginConfig = {
  baseUrl: string,
  idAttribute?: string,
}

const AVAILABLE_COLLECTIONS = ['notes', 'folders'] as const

const RemoteStoragePlugin: Plugin<PluginConfig> = ({
  baseUrl,
  idAttribute = 'id',
}) => class RemoteStorage implements StoragePlugin {
  private readonly storageMap: Record<string, Storage>

  public static readonly type: 'storage'

  constructor({ currentUserId, }) {
    this.storageMap = AVAILABLE_COLLECTIONS.reduce(
      (theStorages, collectionId) => ({
        ...theStorages,
        [collectionId]: new Storage(currentUserId, baseUrl, collectionId)
      }),
      {}
    )
  }

  async save(collectionId, item) {
    const { [collectionId]: storage = null } = this.storageMap
    if (storage === null) {
      throw new Error(`Invalid collection "${collectionId}"`)
    }
    return storage.saveItem(item)
  }

  async load(collectionId, itemId) {
    const { [collectionId]: storage = null } = this.storageMap
    if (storage === null) {
      throw new Error(`Invalid collection "${collectionId}"`)
    }
    const items = await storage.queryItems()
    if (!itemId) {
      return items
    }
    return items.filter(i => i[idAttribute] === itemId)
  }

  async remove(collectionId, item) {
    const { [collectionId]: storage = null } = this.storageMap
    if (storage === null) {
      throw new Error(`Invalid collection "${collectionId}"`)
    }
    return storage.deleteItem(item)
  }
}

export default RemoteStoragePlugin