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import React from 'react'
const LIKE_WINDOW = 100
const FOLLOW_WINDOW = 100
const SEEN_WINDOW = 100
export type SeenPost = {
uri: string
likeCount: number
repostCount: number
replyCount: number
isFollowedBy: boolean
feedContext: string | undefined
}
export type UserActionHistory = {
/**
* The last 100 post URIs the user has liked
*/
likes: string[]
/**
* The last 100 DIDs the user has followed
*/
follows: string[]
/**
* The last 100 post URIs the user has seen from the Discover feed only
*/
seen: SeenPost[]
}
const userActionHistory: UserActionHistory = {
likes: [],
follows: [],
seen: [],
}
export function getActionHistory() {
return userActionHistory
}
export function useActionHistorySnapshot() {
return React.useState(() => getActionHistory())[0]
}
export function like(postUris: string[]) {
userActionHistory.likes = userActionHistory.likes
.concat(postUris)
.slice(-LIKE_WINDOW)
}
export function unlike(postUris: string[]) {
userActionHistory.likes = userActionHistory.likes.filter(
uri => !postUris.includes(uri),
)
}
export function follow(dids: string[]) {
userActionHistory.follows = userActionHistory.follows
.concat(dids)
.slice(-FOLLOW_WINDOW)
}
export function unfollow(dids: string[]) {
userActionHistory.follows = userActionHistory.follows.filter(
uri => !dids.includes(uri),
)
}
export function seen(posts: SeenPost[]) {
userActionHistory.seen = userActionHistory.seen
.concat(posts)
.slice(-SEEN_WINDOW)
}
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