import { nodeDefinitions, fromGlobalId } from 'graphql-relay'
import { toDashed } from './helpers'

const debug = require('debug')('graphbrainz:types/node')

const TYPE_MODULES = {
  discid: 'disc'
}

const { nodeInterface, nodeField } = nodeDefinitions(
  (globalID, { loaders }) => {
    const { type, id } = fromGlobalId(globalID)
    const entityType = toDashed(type)
    return loaders.lookup.load([entityType, id])
  },
  (obj, context, info) => {
    const type = TYPE_MODULES[obj._type] || obj._type
    if (type) {
      let originalType
      try {
        originalType = require(`./${type}`).default
      } catch (err) {
        debug(`Failed to load type: ${type}`)
        return
      }
      // Don't use `originalType`! The schema may have been extended in which
      // case the types have all been replaced. Instead, find the current type
      // of the same name.
      const typeMap = info.schema.getTypeMap()
      return typeMap[originalType.name]
    }
  }
)

export default nodeInterface
export { nodeInterface, nodeField }