const { keys } = Object
const { join } = require('path')
const Sbot = require('ssb-client')
const avatar = require('ssb-avatar')
const waterfall = require('run-waterfall')
const parallel = require('run-parallel')
// const pull = require('pull-stream')
// const writeFile = require('pull-write-file')

module.exports = fetchData

function fetchData (cb) {
  waterfall([
    Sbot,
    (sbot, cb) => {
      // fetch friend graph
      sbot.friends.all((err, friends) => {
        cb(err, sbot, friends)
      })
    },
    (sbot, friends, cb) => {
      // fetch profiles (name and avatar)
      return parallel(
        keys(friends).map(id => {
          const friendOfFriends = keys(friends[id])
            .filter(foafId => friends[id][foafId] === true)
          return (cb) => {
            avatar(sbot, id, id, (err, { name, image }) => {
              if (err) cb(err)
              else cb(null, {
                id,
                friends: friendOfFriends,
                about: {
                  name,
                  image
                }
              })
            })
          }
        })
      , (err, friends) => {
        cb(err, sbot, friends)
      })
    },
    /*
    (sbot, friends, cb) => {
      // fetch images
      return parallel(
        friends.map(friend => {
          const imageBlobId = friend.about.image
          if (imageBlobId) {
            const imageId = pathFriendlyId(imageBlobId)
            const imagePath = join(__dirname, 'output', 'images', imageId)
            const imageUrl = `/images/${imageId}`
            return (cb) => {
              pull(
                sbot.blobs.get(imageBlobId),
                writeFile(imagePath, function (err) {
                  if (err) cb(err)
                  else cb(null, {
                    id: friend.id,
                    friends: friend.friends,
                    about: {
                      name: friend.about.name,
                      image: imageUrl
                    }
                  })
                })
              )
            }
          } else return (cb) => cb(null, friend)
        })    
      )
    },
    */
    (sbot, friends, cb) => {
      sbot.close(err => {
        cb(err, friends)
      })
    }
  ], cb)
}

/*
function pathFriendlyId (str) {
  return str
    .replace(/\+/g, '-')
    .replace(/\//g, '_')
}
*/