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import { debounce } from 'lodash'
/**
* suggest - generates a suggestor function to be used by emoji-input
* data: object providing source information for specific types of suggestions:
* data.emoji - optional, an array of all emoji available i.e.
* (state.instance.emoji + state.instance.customEmoji)
* data.users - optional, an array of all known users
* updateUsersList - optional, a function to search and append to users
*
* Depending on data present one or both (or none) can be present, so if field
* doesn't support user linking you can just provide only emoji.
*/
const debounceUserSearch = debounce((data, input) => {
data.updateUsersList(input)
}, 500, { leading: true, trailing: false })
export default data => input => {
const firstChar = input[0]
if (firstChar === ':' && data.emoji) {
return suggestEmoji(data.emoji)(input)
}
if (firstChar === '@' && data.users) {
return suggestUsers(data)(input)
}
return []
}
export const suggestEmoji = emojis => input => {
const noPrefix = input.toLowerCase().substr(1)
return emojis
.filter(({ displayText }) => displayText.toLowerCase().match(noPrefix))
.sort((a, b) => {
let aScore = 0
let bScore = 0
// An exact match always wins
aScore += a.displayText.toLowerCase() === noPrefix ? 200 : 0
bScore += b.displayText.toLowerCase() === noPrefix ? 200 : 0
// Prioritize custom emoji a lot
aScore += a.imageUrl ? 100 : 0
bScore += b.imageUrl ? 100 : 0
// Prioritize prefix matches somewhat
aScore += a.displayText.toLowerCase().startsWith(noPrefix) ? 10 : 0
bScore += b.displayText.toLowerCase().startsWith(noPrefix) ? 10 : 0
// Sort by length
aScore -= a.displayText.length
bScore -= b.displayText.length
// Break ties alphabetically
const alphabetically = a.displayText > b.displayText ? 0.5 : -0.5
return bScore - aScore + alphabetically
})
}
export const suggestUsers = data => input => {
const noPrefix = input.toLowerCase().substr(1)
const users = data.users
const newUsers = users.filter(
user =>
user.screen_name.toLowerCase().startsWith(noPrefix) ||
user.name.toLowerCase().startsWith(noPrefix)
/* taking only 20 results so that sorting is a bit cheaper, we display
* only 5 anyway. could be inaccurate, but we ideally we should query
* backend anyway
*/
).slice(0, 20).sort((a, b) => {
let aScore = 0
let bScore = 0
// Matches on screen name (i.e. user@instance) makes a priority
aScore += a.screen_name.toLowerCase().startsWith(noPrefix) ? 2 : 0
bScore += b.screen_name.toLowerCase().startsWith(noPrefix) ? 2 : 0
// Matches on name takes second priority
aScore += a.name.toLowerCase().startsWith(noPrefix) ? 1 : 0
bScore += b.name.toLowerCase().startsWith(noPrefix) ? 1 : 0
const diff = (bScore - aScore) * 10
// Then sort alphabetically
const nameAlphabetically = a.name > b.name ? 1 : -1
const screenNameAlphabetically = a.screen_name > b.screen_name ? 1 : -1
return diff + nameAlphabetically + screenNameAlphabetically
/* eslint-disable camelcase */
}).map(({ screen_name, name, profile_image_url_original }) => ({
displayText: screen_name,
detailText: name,
imageUrl: profile_image_url_original,
replacement: '@' + screen_name + ' '
}))
// BE search users if there are no matches
if (newUsers.length === 0 && data.updateUsersList) {
debounceUserSearch(data, noPrefix)
}
return newUsers
/* eslint-enable camelcase */
}
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