import { expressify } from '@overleaf/promise-utils'
import SessionManager from '../Authentication/SessionManager.mjs'
import ProjectEntityHandler from '../Project/ProjectEntityHandler.mjs'
import EditorController from '../Editor/EditorController.mjs'

// The project's Python dependency list lives in a single Verso requirements
// file at the project root. It is hidden from the file tree and edited through
// the dedicated "Python packages" modal instead.
const REQUIREMENTS_PATH = '/requirements.vrf'

async function getRequirements(req, res) {
  const projectId = req.params.Project_id
  const docs = await ProjectEntityHandler.promises.getAllDocs(projectId)
  const doc = docs[REQUIREMENTS_PATH]
  res.json({ content: doc ? doc.lines.join('\n') : '' })
}

async function setRequirements(req, res) {
  const projectId = req.params.Project_id
  const userId = SessionManager.getLoggedInUserId(req.session)
  const content = typeof req.body.content === 'string' ? req.body.content : ''
  // Normalise line endings; an empty body still upserts an (empty) file, which
  // is harmless and keeps the editor state simple.
  const docLines = content.replace(/\r\n?/g, '\n').split('\n')
  await EditorController.promises.upsertDocWithPath(
    projectId,
    REQUIREMENTS_PATH,
    docLines,
    'python-requirements',
    userId
  )
  res.json({ content })
}

export default {
  getRequirements: expressify(getRequirements),
  setRequirements: expressify(setRequirements),
}