/* eslint-disable
    camelcase,
    handle-callback-err,
    max-len,
    no-unused-vars,
    no-useless-escape,
*/
// TODO: This file was created by bulk-decaffeinate.
// Fix any style issues and re-enable lint.
/*
 * decaffeinate suggestions:
 * DS102: Remove unnecessary code created because of implicit returns
 * DS207: Consider shorter variations of null checks
 * Full docs: https://github.com/decaffeinate/decaffeinate/blob/master/docs/suggestions.md
 */
let ProjectRootDocManager
const ProjectEntityHandler = require('./ProjectEntityHandler')
const ProjectEntityUpdateHandler = require('./ProjectEntityUpdateHandler')
const ProjectGetter = require('./ProjectGetter')
const DocumentHelper = require('../Documents/DocumentHelper')
const Path = require('path')
const fs = require('fs')
const { promisify } = require('util')
const async = require('async')
const globby = require('globby')
const _ = require('underscore')

module.exports = ProjectRootDocManager = {
  setRootDocAutomatically(project_id, callback) {
    if (callback == null) {
      callback = function(error) {}
    }
    return ProjectEntityHandler.getAllDocs(project_id, function(error, docs) {
      if (error != null) {
        return callback(error)
      }

      const jobs = _.map(
        docs,
        (doc, path) =>
          function(cb) {
            if (
              ProjectEntityUpdateHandler.isPathValidForRootDoc(path) &&
              DocumentHelper.contentHasDocumentclass(doc.lines)
            ) {
              return cb(doc._id)
            } else {
              return cb(null)
            }
          }
      )

      return async.series(jobs, function(root_doc_id) {
        if (root_doc_id != null) {
          return ProjectEntityUpdateHandler.setRootDoc(
            project_id,
            root_doc_id,
            callback
          )
        } else {
          return callback()
        }
      })
    })
  },

  findRootDocFileFromDirectory(directoryPath, callback) {
    if (callback == null) {
      callback = function(error, path, content) {}
    }
    const filePathsPromise = globby(['**/*.{tex,Rtex}'], {
      cwd: directoryPath,
      followSymlinkedDirectories: false,
      onlyFiles: true,
      case: false
    })

    // the search order is such that we prefer files closer to the project root, then
    // we go by file size in ascending order, because people often have a main
    // file that just includes a bunch of other files; then we go by name, in
    // order to be deterministic
    filePathsPromise.then(
      unsortedFiles =>
        ProjectRootDocManager._sortFileList(
          unsortedFiles,
          directoryPath,
          function(err, files) {
            if (err != null) {
              return callback(err)
            }
            let doc = null

            return async.until(
              () => doc != null || files.length === 0,
              function(cb) {
                const file = files.shift()
                return fs.readFile(
                  Path.join(directoryPath, file),
                  'utf8',
                  function(error, content) {
                    if (error != null) {
                      return cb(error)
                    }
                    content = (content || '').replace(/\r/g, '')
                    if (DocumentHelper.contentHasDocumentclass(content)) {
                      doc = { path: file, content }
                    }
                    return cb(null)
                  }
                )
              },
              err =>
                callback(
                  err,
                  doc != null ? doc.path : undefined,
                  doc != null ? doc.content : undefined
                )
            )
          }
        ),
      err => callback(err)
    )

    // coffeescript's implicit-return mechanism returns filePathsPromise from this method, which confuses mocha
    return null
  },

  setRootDocFromName(project_id, rootDocName, callback) {
    if (callback == null) {
      callback = function(error) {}
    }
    return ProjectEntityHandler.getAllDocPathsFromProjectById(
      project_id,
      function(error, docPaths) {
        let doc_id, path
        if (error != null) {
          return callback(error)
        }
        // strip off leading and trailing quotes from rootDocName
        rootDocName = rootDocName.replace(/^\'|\'$/g, '')
        // prepend a slash for the root folder if not present
        if (rootDocName[0] !== '/') {
          rootDocName = `/${rootDocName}`
        }
        // find the root doc from the filename
        let root_doc_id = null
        for (doc_id in docPaths) {
          // docpaths have a leading / so allow matching "folder/filename" and "/folder/filename"
          path = docPaths[doc_id]
          if (path === rootDocName) {
            root_doc_id = doc_id
          }
        }
        // try a basename match if there was no match
        if (!root_doc_id) {
          for (doc_id in docPaths) {
            path = docPaths[doc_id]
            if (Path.basename(path) === Path.basename(rootDocName)) {
              root_doc_id = doc_id
            }
          }
        }
        // set the root doc id if we found a match
        if (root_doc_id != null) {
          return ProjectEntityUpdateHandler.setRootDoc(
            project_id,
            root_doc_id,
            callback
          )
        } else {
          return callback()
        }
      }
    )
  },

  ensureRootDocumentIsSet(project_id, callback) {
    if (callback == null) {
      callback = function(error) {}
    }
    return ProjectGetter.getProject(project_id, { rootDoc_id: 1 }, function(
      error,
      project
    ) {
      if (error != null) {
        return callback(error)
      }
      if (project == null) {
        return callback(new Error('project not found'))
      }

      if (project.rootDoc_id != null) {
        return callback()
      } else {
        return ProjectRootDocManager.setRootDocAutomatically(
          project_id,
          callback
        )
      }
    })
  },

  ensureRootDocumentIsValid(project_id, callback) {
    if (callback == null) {
      callback = function(error) {}
    }
    return ProjectGetter.getProject(project_id, { rootDoc_id: 1 }, function(
      error,
      project
    ) {
      if (error != null) {
        return callback(error)
      }
      if (project == null) {
        return callback(new Error('project not found'))
      }

      if (project.rootDoc_id != null) {
        return ProjectEntityHandler.getAllDocPathsFromProjectById(
          project_id,
          function(error, docPaths) {
            if (error != null) {
              return callback(error)
            }
            let rootDocValid = false
            for (let doc_id in docPaths) {
              const _path = docPaths[doc_id]
              if (doc_id === project.rootDoc_id) {
                rootDocValid = true
              }
            }
            if (rootDocValid) {
              return callback()
            } else {
              return ProjectEntityUpdateHandler.unsetRootDoc(project_id, () =>
                ProjectRootDocManager.setRootDocAutomatically(
                  project_id,
                  callback
                )
              )
            }
          }
        )
      } else {
        return ProjectRootDocManager.setRootDocAutomatically(
          project_id,
          callback
        )
      }
    })
  },

  _sortFileList(listToSort, rootDirectory, callback) {
    if (callback == null) {
      callback = function(error, result) {}
    }
    return async.mapLimit(
      listToSort,
      5,
      (filePath, cb) =>
        fs.stat(Path.join(rootDirectory, filePath), function(err, stat) {
          if (err != null) {
            return cb(err)
          }
          return cb(null, {
            size: stat.size,
            path: filePath,
            elements: filePath.split(Path.sep).length,
            name: Path.basename(filePath)
          })
        }),
      function(err, files) {
        if (err != null) {
          return callback(err)
        }

        return callback(
          null,
          _.map(
            files.sort(ProjectRootDocManager._rootDocSort),
            file => file.path
          )
        )
      }
    )
  },

  _rootDocSort(a, b) {
    // sort first by folder depth
    if (a.elements !== b.elements) {
      return a.elements - b.elements
    }
    // ensure main.tex is at the start of each folder
    if (a.name === 'main.tex' && b.name !== 'main.tex') {
      return -1
    }
    if (a.name !== 'main.tex' && b.name === 'main.tex') {
      return 1
    }
    // prefer smaller files
    if (a.size !== b.size) {
      return a.size - b.size
    }
    // otherwise, use the full path name
    return a.path.localeCompare(b.path)
  }
}

const promises = {
  setRootDocAutomatically: promisify(
    ProjectRootDocManager.setRootDocAutomatically
  ),

  findRootDocFileFromDirectory: directoryPath =>
    new Promise((resolve, reject) => {
      ProjectRootDocManager.findRootDocFileFromDirectory(
        directoryPath,
        (error, path, content) => {
          if (error) {
            reject(error)
          } else {
            resolve({ path, content })
          }
        }
      )
    }),
  setRootDocFromName: promisify(ProjectRootDocManager.setRootDocFromName)
}

ProjectRootDocManager.promises = promises

module.exports = ProjectRootDocManager