require('url')

export class StreamWrapper {
  constructor(streamIdOrUrl, accountId, serverUrl, isFE2) {
    this.isFE2 = isFE2
    this.streamsKey = this.isFE2 ? 'projects/' : 'streams/'
    this.branchesKey = this.isFE2 ? 'models/' : 'branches/'
    this.commitsKey = this.isFE2 ? 'versions/' : 'commits/'
    this.originalOutput = streamIdOrUrl
    try {
      this.streamWrapperFromUrl(streamIdOrUrl)
    } catch (e) {
      this.serverUrl = serverUrl
      this.userId = accountId
      this.streamId = streamIdOrUrl
    }
  }

  matchUrl(streamUrl) {
    const fe2UrlRegex = /\/projects\/(?<projectId>[\w\d]+)(?:\/models\/(?<model>[\w\d]+(?:@[\w\d]+)?)(?:,(?<additionalModels>[\w\d]+(?:@[\w\d]+)?))*)?/
    return fe2UrlRegex.exec(streamUrl)
  }

  streamWrapperFromUrl(streamUrl) {
    this.url = new URL(streamUrl)
    this.segments = this.url.pathname.split('/').map((segment) => segment + '/')
    this.serverUrl = this.url.origin

    if (this.segments.length >= 4 && this.segments[3]?.toLowerCase() === this.branchesKey) {
      this.streamId = this.segments[2].replace('/', '')
      if (this.segments.length > 5) {
        let branchSegments = this.segments.slice(4, this.segments.length - 1)
        this.branchName = branchSegments.join('')
      } else {
        this.branchName = this.segments[4]
      }
    } else {
      switch (this.segments.length) {
        case 3: // ie http://speckle.server/streams/8fecc9aa6d
          if (this.segments[1].toLowerCase() === this.streamsKey)
            this.streamId = this.segments[2].replace('/', '')
          else throw new Error(`Cannot parse ${this.originalOutput} into a stream wrapper class`)
          break
        case 4: // ie https://speckle.server/streams/0c6ad366c4/globals/
          if (this.segments[3].toLowerCase().startsWith('globals')) {
            this.streamId = this.segments[2].replace('/', '')
            this.branchName = this.segments[3].replace('/', '')
          } else throw new Error(`Cannot parse ${this.originalOutput} into a stream wrapper class`)
          break
        case 5: // ie http://speckle.server/streams/8fecc9aa6d/commits/76a23d7179
          switch (this.segments[3].toLowerCase()) {
            case this.commitsKey:
              this.streamId = this.segments[2].replace('/', '')
              this.commitId = this.segments[4].replace('/', '')
              break
            case 'globals/':
              this.streamId = this.segments[2].replace('/', '')
              this.branchName = this.segments[3].replace('/', '')
              this.commitId = this.segments[4].replace('/', '')
              break
            case this.branchesKey:
              this.streamId = this.segments[2].replace('/', '')
              this.branchName = this.segments[4].replace('/', '')
              break
            case 'objects/':
              this.streamId = this.segments[2].replace('/', '')
              this.objectId = this.segments[4].replace('/', '')
              break
            default:
              throw new Error(`Cannot parse ${this.originalOutput} into a stream wrapper class`)
          }
          break
        default:
          throw new Error(`Cannot parse ${this.originalOutput} into a stream wrapper class`)
      }
    }
  }
}