import {
  isAuthorizeFormRequired,
  parseAndSubmitAuthorizeForm,
  convertToCSV,
  makeRequest,
  isRelativePath,
  isUri,
  isUrl
} from './utils'
import * as NodeFormData from 'form-data'
import {
  Job,
  Session,
  Context,
  ContextAllAttributes,
  Folder,
  CsrfToken,
  EditContextInput,
  ErrorResponse,
  JobDefinition
} from './types'
import { formatDataForRequest } from './utils/formatDataForRequest'
import { SessionManager } from './SessionManager'

/**
 * A client for interfacing with the SAS Viya REST API.
 *
 */
export class SASViyaApiClient {
  constructor(
    private serverUrl: string,
    private rootFolderName: string,
    private contextName: string,
    private setCsrfToken: (csrfToken: CsrfToken) => void
  ) {
    if (serverUrl) isUrl(serverUrl)
  }

  private csrfToken: CsrfToken | null = null
  private fileUploadCsrfToken: CsrfToken | null = null
  private _debug = false
  private sessionManager = new SessionManager(
    this.serverUrl,
    this.contextName,
    this.setCsrfToken
  )
  private folderMap = new Map<string, Job[]>()

  public get debug() {
    return this._debug
  }

  public set debug(value: boolean) {
    this._debug = value
    this.sessionManager.debug = value
  }

  /**
   * Returns a list of jobs in the currently set root folder.
   */
  public async getJobsInFolder(folderPath: string) {
    const path = isRelativePath(folderPath)
      ? `${this.rootFolderName}/${folderPath}`
      : folderPath
    if (this.folderMap.get(path)) {
      return this.folderMap.get(path)
    }

    await this.populateFolderMap(path)
    return this.folderMap.get(path)
  }

  /**
   * Returns an object containing the server URL and root folder name.
   */
  public getConfig() {
    return {
      serverUrl: this.serverUrl,
      rootFolderName: this.rootFolderName
    }
  }

  /**
   * Updates server URL and root folder name, if it was not set.
   * @param serverUrl - the URL of the server.
   * @param rootFolderName - the name for root folder.
   */
  public setConfig(serverUrl: string, rootFolderName: string) {
    if (serverUrl) this.serverUrl = serverUrl
    if (rootFolderName) this.rootFolderName = rootFolderName
  }

  /**
   * Returns all available compute contexts on this server.
   * @param accessToken - an access token for an authorized user.
   */
  public async getAllContexts(accessToken?: string) {
    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: contexts } = await this.request<{ items: Context[] }>(
      `${this.serverUrl}/compute/contexts?limit=10000`,
      { headers }
    )

    const contextsList = contexts && contexts.items ? contexts.items : []

    return contextsList.map((context: any) => ({
      createdBy: context.createdBy,
      id: context.id,
      name: context.name,
      version: context.version,
      attributes: {}
    }))
  }

  /**
   * Returns all compute contexts on this server that the user has access to.
   * @param accessToken - an access token for an authorized user.
   */
  public async getExecutableContexts(accessToken?: string) {
    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: contexts } = await this.request<{ items: Context[] }>(
      `${this.serverUrl}/compute/contexts?limit=10000`,
      { headers }
    ).catch((err) => {
      throw err
    })

    const contextsList = contexts.items || []
    const executableContexts: any[] = []

    const promises = contextsList.map((context: any) => {
      const linesOfCode = ['%put &=sysuserid;']

      return this.executeScript(
        `test-${context.name}`,
        linesOfCode,
        context.name,
        accessToken,
        null,
        true
      ).catch(() => null)
    })

    const results = await Promise.all(promises)

    results.forEach((result: any, index: number) => {
      if (result) {
        let sysUserId = ''

        if (result.log) {
          const sysUserIdLog = result.log
            .split('\n')
            .find((line: string) => line.startsWith('SYSUSERID='))

          if (sysUserIdLog) {
            sysUserId = sysUserIdLog.replace('SYSUSERID=', '')
          }
        }

        executableContexts.push({
          createdBy: contextsList[index].createdBy,
          id: contextsList[index].id,
          name: contextsList[index].name,
          version: contextsList[index].version,
          attributes: {
            sysUserId
          }
        })
      }
    })

    return executableContexts
  }

  /**
   * Creates a session on the given context.
   * @param contextName - the name of the context to create a session on.
   * @param accessToken - an access token for an authorized user.
   */
  public async createSession(contextName: string, accessToken?: string) {
    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: contexts } = await this.request<{ items: Context[] }>(
      `${this.serverUrl}/compute/contexts?limit=10000`,
      { headers }
    )
    const executionContext =
      contexts.items && contexts.items.length
        ? contexts.items.find((c: any) => c.name === contextName)
        : null
    if (!executionContext) {
      throw new Error(`Execution context ${contextName} not found.`)
    }

    const createSessionRequest = {
      method: 'POST',
      headers: {
        Authorization: `Bearer ${accessToken}`,
        'Content-Type': 'application/json'
      }
    }
    const { result: createdSession } = await this.request<Session>(
      `${this.serverUrl}/compute/contexts/${executionContext.id}/sessions`,
      createSessionRequest
    )

    return createdSession
  }

  /**
   * Creates a compute context on the given server.
   * @param contextName - the name of the context to be created.
   * @param launchContextName - the name of the launcher context used by the compute service.
   * @param sharedAccountId - the ID of the account to run the servers for this context.
   * @param autoExecLines - the lines of code to execute during session initialization.
   * @param accessToken - an access token for an authorized user.
   * @param authorizedUsers - an optional list of authorized user IDs.
   */
  public async createContext(
    contextName: string,
    launchContextName: string,
    sharedAccountId: string,
    autoExecLines: string[],
    accessToken?: string,
    authorizedUsers?: string[]
  ) {
    if (!contextName) {
      throw new Error('Context name is required.')
    }

    if (!launchContextName) {
      throw new Error('Launch context name is required.')
    }

    if (!sharedAccountId) {
      throw new Error('Shared account ID is required.')
    }

    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const requestBody: any = {
      name: contextName,
      launchContext: {
        contextName: launchContextName
      },
      attributes: {
        reuseServerProcesses: true,
        runServerAs: sharedAccountId
      }
    }

    if (authorizedUsers && authorizedUsers.length) {
      requestBody['authorizedUsers'] = authorizedUsers
    } else {
      requestBody['authorizeAllAuthenticatedUsers'] = true
    }

    if (autoExecLines) {
      requestBody.environment = { autoExecLines }
    }

    const createContextRequest: RequestInit = {
      method: 'POST',
      headers,
      body: JSON.stringify(requestBody)
    }

    const { result: context } = await this.request<Context>(
      `${this.serverUrl}/compute/contexts`,
      createContextRequest
    )

    return context
  }

  /**
   * Updates a compute context on the given server.
   * @param contextName - the original name of the context to be updated.
   * @param editedContext - an object with the properties to be updated.
   * @param accessToken - an access token for an authorized user.
   */
  public async editContext(
    contextName: string,
    editedContext: EditContextInput,
    accessToken?: string
  ) {
    if (!contextName) {
      throw new Error('Invalid context name.')
    }

    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    let originalContext

    originalContext = await this.getComputeContextByName(
      contextName,
      accessToken
    ).catch((_) => {})

    // Try to find context by id, when context name has been changed.
    if (!originalContext) {
      originalContext = await this.getComputeContextById(
        editedContext.id!,
        accessToken
      ).catch((err) => {
        throw err
      })
    }

    const { result: context, etag } = await this.request<Context>(
      `${this.serverUrl}/compute/contexts/${originalContext.id}`,
      {
        headers
      }
    ).catch((err) => {
      if (err && err.status === 404) {
        throw new Error(
          `The context '${contextName}' was not found on this server.`
        )
      }

      throw err
    })

    // An If-Match header with the value of the last ETag for the context
    // is required to be able to update it
    // https://developer.sas.com/apis/rest/Compute/#update-a-context-definition
    headers['If-Match'] = etag

    const updateContextRequest: RequestInit = {
      method: 'PUT',
      headers,
      body: JSON.stringify({
        ...context,
        ...editedContext,
        attributes: { ...context.attributes, ...editedContext.attributes }
      })
    }

    return await this.request<Context>(
      `${this.serverUrl}/compute/contexts/${context.id}`,
      updateContextRequest
    )
  }

  /**
   * Deletes a compute context on the given server.
   * @param contextName - the name of the context to be deleted.
   * @param accessToken - an access token for an authorized user.
   */
  public async deleteContext(contextName: string, accessToken?: string) {
    if (!contextName) {
      throw new Error('Invalid context name.')
    }

    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const context = await this.getComputeContextByName(contextName, accessToken)

    const deleteContextRequest: RequestInit = {
      method: 'DELETE',
      headers
    }

    return await this.request<Context>(
      `${this.serverUrl}/compute/contexts/${context.id}`,
      deleteContextRequest
    )
  }

  /**
   * Executes code on the current SAS Viya server.
   * @param jobPath - the path to the file being submitted for execution.
   * @param linesOfCode - an array of code lines to execute.
   * @param contextName - the context to execute the code in.
   * @param accessToken - an access token for an authorized user.
   * @param sessionId - optional session ID to reuse.
   * @param data - execution data.
   * @param debug - when set to true, the log will be returned.
   * @param expectWebout - when set to true, the automatic _webout fileref will be checked for content, and that content returned. This fileref is used when the Job contains a SASjs web request (as opposed to executing arbitrary SAS code).
   */
  public async executeScript(
    jobPath: string,
    linesOfCode: string[],
    contextName: string,
    accessToken?: string,
    data = null,
    expectWebout = false
  ): Promise<any> {
    try {
      const headers: any = {
        'Content-Type': 'application/json'
      }

      if (accessToken) {
        headers.Authorization = `Bearer ${accessToken}`
      }

      let executionSessionId: string
      const session = await this.sessionManager.getSession(accessToken)
      executionSessionId = session!.id

      const jobArguments: { [key: string]: any } = {
        _contextName: contextName,
        _OMITJSONLISTING: true,
        _OMITJSONLOG: true,
        _OMITSESSIONRESULTS: true,
        _OMITTEXTLISTING: true,
        _OMITTEXTLOG: true
      }

      if (this.debug) {
        jobArguments['_OMITTEXTLOG'] = false
        jobArguments['_OMITSESSIONRESULTS'] = false
        jobArguments['_DEBUG'] = 131
      }

      let fileName
      if (isRelativePath(jobPath)) {
        fileName = `exec-${
          jobPath.includes('/') ? jobPath.split('/')[1] : jobPath
        }`
      } else {
        const jobPathParts = jobPath.split('/')
        fileName = jobPathParts.pop()
      }

      let jobVariables: any = {
        SYS_JES_JOB_URI: '',
        _program: isRelativePath(jobPath)
          ? this.rootFolderName + '/' + jobPath
          : jobPath
      }

      let files: any[] = []

      if (data) {
        if (JSON.stringify(data).includes(';')) {
          files = await this.uploadTables(data, accessToken)

          jobVariables['_webin_file_count'] = files.length

          files.forEach((fileInfo, index) => {
            jobVariables[
              `_webin_fileuri${index + 1}`
            ] = `/files/files/${fileInfo.file.id}`
            jobVariables[`_webin_name${index + 1}`] = fileInfo.tableName
          })
        } else {
          jobVariables = { ...jobVariables, ...formatDataForRequest(data) }
        }
      }

      // Execute job in session
      const postJobRequest = {
        method: 'POST',
        headers,
        body: JSON.stringify({
          name: fileName,
          description: 'Powered by SASjs',
          code: linesOfCode,
          variables: jobVariables,
          arguments: jobArguments
        })
      }

      const { result: postedJob, etag } = await this.request<Job>(
        `${this.serverUrl}/compute/sessions/${executionSessionId}/jobs`,
        postJobRequest
      )

      if (this.debug) {
        console.log(`Job has been submitted for '${fileName}'.`)
        console.log(
          `You can monitor the job progress at '${this.serverUrl}${
            postedJob.links.find((l: any) => l.rel === 'state')!.href
          }'.`
        )
      }

      const jobStatus = await this.pollJobState(postedJob, etag, accessToken)

      const { result: currentJob } = await this.request<Job>(
        `${this.serverUrl}/compute/sessions/${executionSessionId}/jobs/${postedJob.id}`,
        { headers }
      )

      let jobResult
      let log

      const logLink = currentJob.links.find((l) => l.rel === 'log')

      if (this.debug && logLink) {
        log = await this.request<any>(
          `${this.serverUrl}${logLink.href}/content?limit=10000`,
          {
            headers
          }
        ).then((res: any) =>
          res.result.items.map((i: any) => i.line).join('\n')
        )
      }

      if (jobStatus === 'failed' || jobStatus === 'error') {
        return Promise.reject({ error: currentJob.error, log })
      }

      let resultLink

      if (expectWebout) {
        resultLink = `/compute/sessions/${executionSessionId}/filerefs/_webout/content`
      }

      if (resultLink) {
        jobResult = await this.request<any>(
          `${this.serverUrl}${resultLink}`,
          { headers },
          'text'
        ).catch(async (e) => {
          if (e && e.status === 404) {
            if (logLink) {
              log = await this.request<any>(
                `${this.serverUrl}${logLink.href}/content?limit=10000`,
                {
                  headers
                }
              ).then((res: any) =>
                res.result.items.map((i: any) => i.line).join('\n')
              )

              return Promise.reject(
                new ErrorResponse('Job execution failed', {
                  status: 500,
                  body: log
                })
              )
            }
          }
          return {
            result: JSON.stringify(e)
          }
        })
      }

      await this.sessionManager.clearSession(executionSessionId, accessToken)

      return { result: jobResult?.result, log }
    } catch (e) {
      if (e && e.status === 404) {
        return this.executeScript(
          jobPath,
          linesOfCode,
          contextName,
          accessToken,
          data
        )
      } else {
        throw e
      }
    }
  }

  /**
   * Creates a folder. Path to or URI of the parent folder is required.
   * @param folderName - the name of the new folder.
   * @param parentFolderPath - the full path to the parent folder.  If not
   *  provided, the parentFolderUri must be provided.
   * @param parentFolderUri - the URI (eg /folders/folders/UUID) of the parent
   *  folder. If not provided, the parentFolderPath must be provided.
   * @param accessToken - an access token for authorizing the request.
   * @param isForced - flag that indicates if target folder already exists, it and all subfolders have to be deleted.
   */
  public async createFolder(
    folderName: string,
    parentFolderPath?: string,
    parentFolderUri?: string,
    accessToken?: string,
    isForced?: boolean
  ): Promise<Folder> {
    if (!parentFolderPath && !parentFolderUri) {
      throw new Error('Path or URI of the parent folder is required.')
    }

    if (!parentFolderUri && parentFolderPath) {
      parentFolderUri = await this.getFolderUri(parentFolderPath, accessToken)
      if (!parentFolderUri) {
        console.log(
          `Parent folder at path '${parentFolderPath}' is not present.`
        )

        const newParentFolderPath = parentFolderPath.substring(
          0,
          parentFolderPath.lastIndexOf('/')
        )
        const newFolderName = `${parentFolderPath.split('/').pop()}`
        if (newParentFolderPath === '') {
          throw new Error('Root folder has to be present on the server.')
        }
        console.log(
          `Creating parent folder:\n'${newFolderName}' in '${newParentFolderPath}'`
        )
        const parentFolder = await this.createFolder(
          newFolderName,
          newParentFolderPath,
          undefined,
          accessToken
        )
        console.log(
          `Parent folder '${newFolderName}' has been successfully created.`
        )
        parentFolderUri = `/folders/folders/${parentFolder.id}`
      } else if (isForced && accessToken) {
        const folderPath = parentFolderPath + '/' + folderName
        const folderUri = await this.getFolderUri(folderPath, accessToken)

        if (folderUri) {
          await this.deleteFolder(
            parentFolderPath + '/' + folderName,
            accessToken
          )
        }
      }
    }

    const createFolderRequest: RequestInit = {
      method: 'POST',
      body: JSON.stringify({
        name: folderName,
        type: 'folder'
      })
    }

    createFolderRequest.headers = { 'Content-Type': 'application/json' }
    if (accessToken) {
      createFolderRequest.headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: createFolderResponse } = await this.request<Folder>(
      `${this.serverUrl}/folders/folders?parentFolderUri=${parentFolderUri}`,
      createFolderRequest
    )

    // update folder map with newly created folder.
    await this.populateFolderMap(
      `${parentFolderPath}/${folderName}`,
      accessToken
    )
    return createFolderResponse
  }

  /**
   * Creates a Job in the specified folder (or folder uri).
   * @param parentFolderPath - the location of the new job.
   * @param parentFolderUri - the URI location of the new job. The function is a
   * little faster if the folder URI is supplied instead of the path.
   * @param jobName - the name of the new job to be created.
   * @param code - the SAS code for the new job.
   */
  public async createJobDefinition(
    jobName: string,
    code: string,
    parentFolderPath?: string,
    parentFolderUri?: string,
    accessToken?: string
  ) {
    if (!parentFolderPath && !parentFolderUri) {
      throw new Error(`Path to or URI of the parent folder is required.`)
    }

    if (!parentFolderUri && parentFolderPath) {
      parentFolderUri = await this.getFolderUri(parentFolderPath, accessToken)
    }

    const createJobDefinitionRequest: RequestInit = {
      method: 'POST',
      headers: {
        'Content-Type': 'application/vnd.sas.job.definition+json',
        Accept: 'application/vnd.sas.job.definition+json'
      },
      body: JSON.stringify({
        name: jobName,
        parameters: [
          {
            name: '_addjesbeginendmacros',
            type: 'CHARACTER',
            defaultValue: 'false'
          }
        ],
        type: 'Compute',
        code
      })
    }

    if (accessToken) {
      createJobDefinitionRequest!.headers = {
        ...createJobDefinitionRequest.headers,
        Authorization: `Bearer ${accessToken}`
      }
    }

    return await this.request<Job>(
      `${this.serverUrl}/jobDefinitions/definitions?parentFolderUri=${parentFolderUri}`,
      createJobDefinitionRequest
    )
  }

  /**
   * Performs a login redirect and returns an auth code for the given client.
   * @param clientId - the client ID to authenticate with.
   */
  public async getAuthCode(clientId: string) {
    const authUrl = `${this.serverUrl}/SASLogon/oauth/authorize?client_id=${clientId}&response_type=code`

    const authCode = await fetch(authUrl, {
      referrerPolicy: 'same-origin',
      credentials: 'include'
    })
      .then((response) => response.text())
      .then(async (response) => {
        let code = ''
        if (isAuthorizeFormRequired(response)) {
          const formResponse: any = await parseAndSubmitAuthorizeForm(
            response,
            this.serverUrl
          )

          const responseBody = formResponse
            .split('<body>')[1]
            .split('</body>')[0]
          const bodyElement: any = document.createElement('div')
          bodyElement.innerHTML = responseBody

          code = bodyElement.querySelector('.infobox h4').innerText

          return code
        } else {
          const responseBody = response.split('<body>')[1].split('</body>')[0]
          const bodyElement: any = document.createElement('div')
          bodyElement.innerHTML = responseBody

          if (bodyElement) {
            code = bodyElement.querySelector('.infobox h4').innerText
          }

          return code
        }
      })
      .catch(() => null)

    return authCode
  }

  /**
   * Exchanges the auth code for an access token for the given client.
   * @param clientId - the client ID to authenticate with.
   * @param clientSecret - the client secret to authenticate with.
   * @param authCode - the auth code received from the server.
   */
  public async getAccessToken(
    clientId: string,
    clientSecret: string,
    authCode: string
  ) {
    const url = this.serverUrl + '/SASLogon/oauth/token'
    let token
    if (typeof Buffer === 'undefined') {
      token = btoa(clientId + ':' + clientSecret)
    } else {
      token = Buffer.from(clientId + ':' + clientSecret).toString('base64')
    }
    const headers = {
      Authorization: 'Basic ' + token
    }

    let formData
    if (typeof FormData === 'undefined') {
      formData = new NodeFormData()
      formData.append('grant_type', 'authorization_code')
      formData.append('code', authCode)
    } else {
      formData = new FormData()
      formData.append('grant_type', 'authorization_code')
      formData.append('code', authCode)
    }

    const authResponse = await fetch(url, {
      method: 'POST',
      credentials: 'include',
      headers,
      body: formData as any,
      referrerPolicy: 'same-origin'
    }).then((res) => res.json())

    return authResponse
  }

  /**
   * Exchanges the refresh token for an access token for the given client.
   * @param clientId - the client ID to authenticate with.
   * @param clientSecret - the client secret to authenticate with.
   * @param authCode - the refresh token received from the server.
   */
  public async refreshTokens(
    clientId: string,
    clientSecret: string,
    refreshToken: string
  ) {
    const url = this.serverUrl + '/SASLogon/oauth/token'
    let token
    if (typeof Buffer === 'undefined') {
      token = btoa(clientId + ':' + clientSecret)
    } else {
      token = Buffer.from(clientId + ':' + clientSecret).toString('base64')
    }
    const headers = {
      Authorization: 'Basic ' + token
    }

    let formData
    if (typeof FormData === 'undefined') {
      formData = new NodeFormData()
      formData.append('grant_type', 'refresh_token')
      formData.append('refresh_token', refreshToken)
    } else {
      formData = new FormData()
      formData.append('grant_type', 'refresh_token')
      formData.append('refresh_token', refreshToken)
    }

    const authResponse = await fetch(url, {
      method: 'POST',
      credentials: 'include',
      headers,
      body: formData as any,
      referrerPolicy: 'same-origin'
    }).then((res) => res.json())

    return authResponse
  }

  /**
   * Deletes the client representing the supplied ID.
   * @param clientId - the client ID to authenticate with.
   * @param accessToken - an access token for authorizing the request.
   */
  public async deleteClient(clientId: string, accessToken?: string) {
    const url = this.serverUrl + `/oauth/clients/${clientId}`
    const headers: any = {}
    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }
    const deleteResponse = await this.request(url, {
      method: 'DELETE',
      credentials: 'include',
      headers
    })

    return deleteResponse
  }

  /**
   * Executes a job via the SAS Viya Compute API.
   * @param sasJob - the relative path to the job.
   * @param contextName - the name of the context where the job is to be executed.
   * @param debug - sets the _debug flag in the job arguments.
   * @param data - any data to be passed in as input to the job.
   * @param accessToken - an optional access token for an authorized user.
   */
  public async executeComputeJob(
    sasJob: string,
    contextName: string,
    debug: boolean,
    data?: any,
    accessToken?: string
  ) {
    if (isRelativePath(sasJob) && !this.rootFolderName) {
      throw new Error(
        'Relative paths cannot be used without specifying a root folder name'
      )
    }

    if (isRelativePath(sasJob)) {
      const folderName = sasJob.split('/')[0]
      await this.populateFolderMap(
        `${this.rootFolderName}/${folderName}`,
        accessToken
      )

      if (!this.folderMap.get(`${this.rootFolderName}/${folderName}`)) {
        throw new Error(
          `The folder '${folderName}' was not found at '${this.serverUrl}/${this.rootFolderName}'`
        )
      }
    } else {
      const folderPathParts = sasJob.split('/')
      folderPathParts.pop()
      const folderPath = folderPathParts.join('/')
      await this.populateFolderMap(folderPath, accessToken)
    }

    const headers: any = { 'Content-Type': 'application/json' }
    if (!!accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    let jobToExecute
    if (isRelativePath(sasJob)) {
      const folderName = sasJob.split('/')[0]
      const jobName = sasJob.split('/')[1]
      const jobFolder = this.folderMap.get(
        `${this.rootFolderName}/${folderName}`
      )
      jobToExecute = jobFolder?.find((item) => item.name === jobName)
    } else {
      const folderPathParts = sasJob.split('/')
      const jobName = folderPathParts.pop()
      const folderPath = folderPathParts.join('/')
      const jobFolder = this.folderMap.get(folderPath)
      jobToExecute = jobFolder?.find((item) => item.name === jobName)
    }

    if (!jobToExecute) {
      throw new Error(`Job was not found.`)
    }

    let code = jobToExecute?.code

    if (!code) {
      const jobDefinitionLink = jobToExecute?.links.find(
        (l) => l.rel === 'getResource'
      )

      if (!jobDefinitionLink) {
        throw new Error(`URI of job definition was not found.`)
      }

      const { result: jobDefinition } = await this.request<JobDefinition>(
        `${this.serverUrl}${jobDefinitionLink.href}`,
        { headers }
      )

      code = jobDefinition.code

      // Adds code to existing job definition
      jobToExecute.code = code
    }

    const linesToExecute = code.replace(/\r\n/g, '\n').split('\n')
    return await this.executeScript(
      sasJob,
      linesToExecute,
      contextName,
      accessToken,
      data,
      true
    )
  }

  /**
   * Executes a job via the SAS Viya Job Execution API
   * @param sasJob - the relative or absolute path to the job.
   * @param contextName - the name of the context where the job is to be executed.
   * @param debug - sets the _debug flag in the job arguments.
   * @param data - any data to be passed in as input to the job.
   * @param accessToken - an optional access token for an authorized user.
   */
  public async executeJob(
    sasJob: string,
    contextName: string,
    debug: boolean,
    data?: any,
    accessToken?: string
  ) {
    if (isRelativePath(sasJob) && !this.rootFolderName) {
      throw new Error(
        'Relative paths cannot be used without specifying a root folder name.'
      )
    }

    if (isRelativePath(sasJob)) {
      const folderName = sasJob.split('/')[0]
      await this.populateFolderMap(
        `${this.rootFolderName}/${folderName}`,
        accessToken
      )

      if (!this.folderMap.get(`${this.rootFolderName}/${folderName}`)) {
        throw new Error(
          `The folder '${folderName}' was not found at '${this.serverUrl}/${this.rootFolderName}'.`
        )
      }
    } else {
      const folderPathParts = sasJob.split('/')
      folderPathParts.pop()
      const folderPath = folderPathParts.join('/')
      await this.populateFolderMap(folderPath, accessToken)
      if (!this.folderMap.get(folderPath)) {
        throw new Error(
          `The folder '${folderPath}' was not found at '${this.serverUrl}'.`
        )
      }
    }

    let files: any[] = []
    if (data && Object.keys(data).length) {
      files = await this.uploadTables(data, accessToken)
    }

    let jobToExecute: Job | undefined
    let jobName: string | undefined
    let jobPath: string | undefined
    if (isRelativePath(sasJob)) {
      const folderName = sasJob.split('/')[0]
      jobName = sasJob.split('/')[1]
      jobPath = `${this.rootFolderName}/${folderName}`
      const jobFolder = this.folderMap.get(jobPath)
      jobToExecute = jobFolder?.find((item) => item.name === jobName)
    } else {
      const folderPathParts = sasJob.split('/')
      jobName = folderPathParts.pop()
      jobPath = folderPathParts.join('/')
      const jobFolder = this.folderMap.get(jobPath)
      jobToExecute = jobFolder?.find((item) => item.name === jobName)
    }

    if (!jobToExecute) {
      throw new Error(`The job ${sasJob} was not found.`)
    }
    const jobDefinitionLink = jobToExecute?.links.find(
      (l) => l.rel === 'getResource'
    )?.href
    const requestInfo: any = {
      method: 'GET'
    }
    const headers: any = { 'Content-Type': 'application/json' }

    if (!!accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    requestInfo.headers = headers

    const { result: jobDefinition } = await this.request<Job>(
      `${this.serverUrl}${jobDefinitionLink}`,
      requestInfo
    )

    const jobArguments: { [key: string]: any } = {
      _contextName: contextName,
      _program: `${jobPath}/${jobName}`,
      _webin_file_count: files.length,
      _OMITJSONLISTING: true,
      _OMITJSONLOG: true,
      _OMITSESSIONRESULTS: true,
      _OMITTEXTLISTING: true,
      _OMITTEXTLOG: true
    }

    if (debug) {
      jobArguments['_OMITTEXTLOG'] = 'false'
      jobArguments['_OMITSESSIONRESULTS'] = 'false'
      jobArguments['_DEBUG'] = 131
    }

    files.forEach((fileInfo, index) => {
      jobArguments[
        `_webin_fileuri${index + 1}`
      ] = `/files/files/${fileInfo.file.id}`
      jobArguments[`_webin_name${index + 1}`] = fileInfo.tableName
    })

    const postJobRequest = {
      method: 'POST',
      headers,
      body: JSON.stringify({
        name: `exec-${jobName}`,
        description: 'Powered by SASjs',
        jobDefinition,
        arguments: jobArguments
      })
    }
    const { result: postedJob, etag } = await this.request<Job>(
      `${this.serverUrl}/jobExecution/jobs?_action=wait`,
      postJobRequest
    )
    const jobStatus = await this.pollJobState(postedJob, etag, accessToken)
    const { result: currentJob } = await this.request<Job>(
      `${this.serverUrl}/jobExecution/jobs/${postedJob.id}`,
      { headers }
    )

    let jobResult
    let log
    if (jobStatus === 'failed') {
      return Promise.reject(currentJob.error)
    }
    const resultLink = currentJob.results['_webout.json']
    const logLink = currentJob.links.find((l) => l.rel === 'log')
    if (resultLink) {
      jobResult = await this.request<any>(
        `${this.serverUrl}${resultLink}/content`,
        { headers },
        'text'
      )
    }
    if (debug && logLink) {
      log = await this.request<any>(
        `${this.serverUrl}${logLink.href}/content`,
        {
          headers
        }
      ).then((res: any) => res.result.items.map((i: any) => i.line).join('\n'))
    }
    return { result: jobResult?.result, log }
  }

  private async populateFolderMap(folderPath: string, accessToken?: string) {
    const path = isRelativePath(folderPath)
      ? `${this.rootFolderName}/${folderPath}`
      : folderPath
    if (this.folderMap.get(path)) {
      return
    }

    const url = '/folders/folders/@item?path=' + path
    const requestInfo: any = {
      method: 'GET'
    }
    if (accessToken) {
      requestInfo.headers = { Authorization: `Bearer ${accessToken}` }
    }
    const { result: folder } = await this.request<Folder>(
      `${this.serverUrl}${url}`,
      requestInfo
    )
    if (!folder) {
      throw new Error(`The path ${path} does not exist on ${this.serverUrl}`)
    }
    const { result: members } = await this.request<{ items: any[] }>(
      `${this.serverUrl}/folders/folders/${folder.id}/members`,
      requestInfo
    )

    const itemsAtRoot = members.items
    this.folderMap.set(path, itemsAtRoot)
  }

  private async pollJobState(
    postedJob: any,
    etag: string | null,
    accessToken?: string
  ) {
    const MAX_POLL_COUNT = 1000
    const POLL_INTERVAL = 100
    let postedJobState = ''
    let pollCount = 0
    const headers: any = {
      'Content-Type': 'application/json',
      'If-None-Match': etag
    }
    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }
    const stateLink = postedJob.links.find((l: any) => l.rel === 'state')
    if (!stateLink) {
      Promise.reject(`Job state link was not found.`)
    }

    const { result: state } = await this.request<string>(
      `${this.serverUrl}${stateLink.href}?_action=wait&wait=30`,
      {
        headers
      },
      'text'
    )

    const currentState = state.trim()
    if (currentState === 'completed') {
      return Promise.resolve(currentState)
    }

    return new Promise(async (resolve, _) => {
      const interval = setInterval(async () => {
        if (
          postedJobState === 'running' ||
          postedJobState === '' ||
          postedJobState === 'pending'
        ) {
          if (stateLink) {
            if (this.debug) {
              console.log('Polling job status... \n')
            }
            const { result: jobState } = await this.request<string>(
              `${this.serverUrl}${stateLink.href}?_action=wait&wait=30`,
              {
                headers
              },
              'text'
            )

            postedJobState = jobState.trim()
            if (this.debug) {
              console.log(`Current state: ${postedJobState}\n`)
            }
            pollCount++
            if (pollCount >= MAX_POLL_COUNT) {
              resolve(postedJobState)
            }
          }
        } else {
          clearInterval(interval)
          resolve(postedJobState)
        }
      }, POLL_INTERVAL)
    })
  }

  private async uploadTables(data: any, accessToken?: string) {
    const uploadedFiles = []
    const headers: any = {
      'Content-Type': 'application/json'
    }
    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    for (const tableName in data) {
      const csv = convertToCSV(data[tableName])
      if (csv === 'ERROR: LARGE STRING LENGTH') {
        throw new Error(
          'The max length of a string value in SASjs is 32765 characters.'
        )
      }

      const createFileRequest = {
        method: 'POST',
        body: csv,
        headers
      }

      const uploadResponse = await this.request<any>(
        `${this.serverUrl}/files/files#rawUpload`,
        createFileRequest,
        'json',
        'fileUpload'
      )

      uploadedFiles.push({ tableName, file: uploadResponse.result })
    }
    return uploadedFiles
  }

  private async getFolderUri(folderPath: string, accessToken?: string) {
    const url = '/folders/folders/@item?path=' + folderPath
    const requestInfo: any = {
      method: 'GET'
    }
    if (accessToken) {
      requestInfo.headers = { Authorization: `Bearer ${accessToken}` }
    }
    const { result: folder } = await this.request<Folder>(
      `${this.serverUrl}${url}`,
      requestInfo
    ).catch((err) => {
      return { result: null }
    })

    if (!folder) return undefined
    return `/folders/folders/${folder.id}`
  }

  private async getRecycleBinUri(accessToken: string) {
    const url = '/folders/folders/@myRecycleBin'
    const requestInfo = {
      method: 'GET',
      headers: {
        'Content-Type': 'application/json',
        Authorization: 'Bearer ' + accessToken
      }
    }

    const { result: folder } = await this.request<Folder>(
      `${this.serverUrl}${url}`,
      requestInfo
    ).catch((err) => {
      return { result: null }
    })

    if (!folder) return undefined

    return `/folders/folders/${folder.id}`
  }

  /**
   * Returns a JSON representation of a compute context.
   * @example: { "createdBy": "admin", "links": [...], "id": "ID", "version": 2, "name": "context1" }
   * @param contextName - the name of the context to return.
   * @param accessToken - an access token for an authorized user.
   */
  public async getComputeContextByName(
    contextName: string,
    accessToken?: string
  ): Promise<Context> {
    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: contexts } = await this.request<{ items: Context[] }>(
      `${this.serverUrl}/compute/contexts?filter=eq(name, "${contextName}")`,
      { headers }
    )

    if (!contexts || !(contexts.items && contexts.items.length)) {
      throw new Error(
        `The context '${contextName}' was not found at '${this.serverUrl}'.`
      )
    }

    return contexts.items[0]
  }

  /**
   * Returns a JSON representation of a compute context.
   * @param contextId - an id of the context to return.
   * @param accessToken - an access token for an authorized user.
   */
  public async getComputeContextById(
    contextId: string,
    accessToken?: string
  ): Promise<ContextAllAttributes> {
    const headers: any = {
      'Content-Type': 'application/json'
    }

    if (accessToken) {
      headers.Authorization = `Bearer ${accessToken}`
    }

    const { result: context } = await this.request<ContextAllAttributes>(
      `${this.serverUrl}/compute/contexts/${contextId}`,
      { headers }
    ).catch((err) => {
      throw err
    })

    return context
  }

  /**
   * Moves a Viya folder to a new location.  The folder may be renamed at the same time.
   * @param sourceFolder - the full path (eg `/Public/example/myFolder`) or URI of the source folder to be moved. Providing URI instead of path will save one extra request.
   * @param targetParentFolder - the full path or URI of the _parent_ folder to which the `sourceFolder` will be moved (eg `/Public/newDestination`). To move a folder, a user has to have write permissions in targetParentFolder. Providing URI instead of path will save one extra request.
   * @param targetFolderName - the name of the "moved" folder.  If left blank, the original folder name will be used (eg `myFolder` in `/Public/newDestination/myFolder` for the example above).  Optional field.
   * @param accessToken - an access token for authorizing the request.
   */
  public async moveFolder(
    sourceFolder: string,
    targetParentFolder: string,
    targetFolderName: string,
    accessToken: string
  ) {
    // checks if 'sourceFolder' is already a URI
    const sourceFolderUri = isUri(sourceFolder)
      ? sourceFolder
      : await this.getFolderUri(sourceFolder, accessToken)

    // checks if 'targetParentFolder' is already a URI
    const targetParentFolderUri = isUri(targetParentFolder)
      ? targetParentFolder
      : await this.getFolderUri(targetParentFolder, accessToken)

    const sourceFolderId = sourceFolderUri?.split('/').pop()
    const url = sourceFolderUri

    const requestInfo = {
      method: 'PATCH',
      headers: {
        'Content-Type': 'application/json',
        Authorization: 'Bearer ' + accessToken
      },
      body: JSON.stringify({
        id: sourceFolderId,
        name: targetFolderName,
        parentFolderUri: targetParentFolderUri
      })
    }

    const { result: folder } = await this.request<Folder>(
      `${this.serverUrl}${url}`,
      requestInfo
    ).catch((err) => {
      if (err.code && err.code === 'ENOTFOUND') {
        const notFoundError = {
          body: JSON.stringify({
            message: `Folder '${sourceFolder.split('/').pop()}' was not found.`
          })
        }

        throw notFoundError
      }

      throw err
    })

    if (!folder) return undefined

    return folder
  }

  /**
   * For performance (and in case of accidental error) the `deleteFolder` function does not actually delete the folder (and all its content and subfolder content). Instead the folder is simply moved to the recycle bin. Deletion time will be added to the folder name.
   * @param folderPath - the full path (eg `/Public/example/deleteThis`) of the folder to be deleted.
   * @param accessToken - an access token for authorizing the request.
   */
  public async deleteFolder(folderPath: string, accessToken: string) {
    const recycleBinUri = await this.getRecycleBinUri(accessToken)
    const folderName = folderPath.split('/').pop() || ''
    const date = new Date()
    const timeMark = date.toLocaleDateString() + ' ' + date.toLocaleTimeString()
    const deletedFolderName = folderName + ' ' + timeMark

    const movedFolder = await this.moveFolder(
      folderPath,
      recycleBinUri!,
      deletedFolderName,
      accessToken
    )

    return movedFolder
  }

  setCsrfTokenLocal = (csrfToken: CsrfToken) => {
    this.csrfToken = csrfToken
    this.setCsrfToken(csrfToken)
  }

  setFileUploadCsrfToken = (csrfToken: CsrfToken) => {
    this.fileUploadCsrfToken = csrfToken
  }

  private async request<T>(
    url: string,
    options: RequestInit,
    contentType: 'text' | 'json' = 'json',
    type: 'fileUpload' | 'other' = 'other'
  ) {
    const callback =
      type === 'fileUpload'
        ? this.setFileUploadCsrfToken
        : this.setCsrfTokenLocal

    if (type === 'other') {
      if (this.csrfToken) {
        options.headers = {
          ...options.headers,
          [this.csrfToken.headerName]: this.csrfToken.value
        }
      }
    } else {
      if (this.fileUploadCsrfToken) {
        options.headers = {
          ...options.headers,
          [this.fileUploadCsrfToken.headerName]: this.fileUploadCsrfToken.value
        }
      }
    }
    return await makeRequest<T>(url, options, callback, contentType)
  }
}