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import type { UserMessage } from "@opencode-ai/sdk/v2"
import { useLocation, useNavigate } from "@solidjs/router"
import { createEffect, createMemo, onCleanup, onMount } from "solid-js"
import { messageIdFromHash } from "./message-id-from-hash"
export const useSessionHashScroll = (input: {
sessionKey: () => string
sessionID: () => string | undefined
messagesReady: () => boolean
visibleUserMessages: () => UserMessage[]
historyMore: () => boolean
historyLoading: () => boolean
loadMore: (sessionID: string) => Promise<void>
turnStart: () => number
currentMessageId: () => string | undefined
pendingMessage: () => string | undefined
setPendingMessage: (value: string | undefined) => void
setActiveMessage: (message: UserMessage | undefined) => void
setTurnStart: (value: number) => void
autoScroll: { pause: () => void; forceScrollToBottom: () => void }
scroller: () => HTMLDivElement | undefined
anchor: (id: string) => string
scheduleScrollState: (el: HTMLDivElement) => void
consumePendingMessage: (key: string) => string | undefined
}) => {
const visibleUserMessages = createMemo(() => input.visibleUserMessages())
const messageById = createMemo(() => new Map(visibleUserMessages().map((m) => [m.id, m])))
const messageIndex = createMemo(() => new Map(visibleUserMessages().map((m, i) => [m.id, i])))
let pendingKey = ""
let clearing = false
const location = useLocation()
const navigate = useNavigate()
const frames = new Set<number>()
const queue = (fn: () => void) => {
const id = requestAnimationFrame(() => {
frames.delete(id)
fn()
})
frames.add(id)
}
const cancel = () => {
for (const id of frames) cancelAnimationFrame(id)
frames.clear()
}
const clearMessageHash = () => {
cancel()
input.consumePendingMessage(input.sessionKey())
if (input.pendingMessage()) input.setPendingMessage(undefined)
if (!location.hash) return
clearing = true
navigate(location.pathname + location.search, { replace: true })
}
const updateHash = (id: string) => {
const hash = `#${input.anchor(id)}`
if (location.hash === hash) return
clearing = false
navigate(location.pathname + location.search + hash, {
replace: true,
})
}
const scrollToElement = (el: HTMLElement, behavior: ScrollBehavior) => {
const root = input.scroller()
if (!root) return false
const a = el.getBoundingClientRect()
const b = root.getBoundingClientRect()
const sticky = root.querySelector("[data-session-title]")
const inset = sticky instanceof HTMLElement ? sticky.offsetHeight : 0
const top = Math.max(0, a.top - b.top + root.scrollTop - inset)
root.scrollTo({ top, behavior })
return true
}
const seek = (id: string, behavior: ScrollBehavior, left = 4): boolean => {
const el = document.getElementById(input.anchor(id))
if (el) return scrollToElement(el, behavior)
if (left <= 0) return false
queue(() => {
seek(id, behavior, left - 1)
})
return false
}
const scrollToMessage = (message: UserMessage, behavior: ScrollBehavior = "smooth") => {
cancel()
if (input.currentMessageId() !== message.id) input.setActiveMessage(message)
const index = messageIndex().get(message.id) ?? -1
if (index !== -1 && index < input.turnStart()) {
input.setTurnStart(index)
queue(() => {
seek(message.id, behavior)
})
updateHash(message.id)
return
}
if (seek(message.id, behavior)) {
updateHash(message.id)
return
}
updateHash(message.id)
}
const applyHash = (behavior: ScrollBehavior) => {
const hash = location.hash.slice(1)
if (!hash) {
input.autoScroll.forceScrollToBottom()
const el = input.scroller()
if (el) input.scheduleScrollState(el)
return
}
const messageId = messageIdFromHash(hash)
if (messageId) {
input.autoScroll.pause()
const msg = messageById().get(messageId)
if (msg) {
scrollToMessage(msg, behavior)
return
}
return
}
const target = document.getElementById(hash)
if (target) {
input.autoScroll.pause()
scrollToElement(target, behavior)
return
}
input.autoScroll.forceScrollToBottom()
const el = input.scroller()
if (el) input.scheduleScrollState(el)
}
createEffect(() => {
const hash = location.hash
if (!hash) clearing = false
if (!input.sessionID() || !input.messagesReady()) return
cancel()
queue(() => applyHash("auto"))
})
createEffect(() => {
if (!input.sessionID() || !input.messagesReady()) return
visibleUserMessages()
input.turnStart()
let targetId = input.pendingMessage()
if (!targetId) {
const key = input.sessionKey()
if (pendingKey !== key) {
pendingKey = key
const next = input.consumePendingMessage(key)
if (next) {
input.setPendingMessage(next)
targetId = next
}
}
}
if (!targetId && !clearing) targetId = messageIdFromHash(location.hash)
if (!targetId) return
const pending = input.pendingMessage() === targetId
const msg = messageById().get(targetId)
if (!msg) return
if (pending) input.setPendingMessage(undefined)
if (input.currentMessageId() === targetId && !pending) return
input.autoScroll.pause()
cancel()
queue(() => scrollToMessage(msg, "auto"))
})
createEffect(() => {
const sessionID = input.sessionID()
if (!sessionID || !input.messagesReady()) return
visibleUserMessages()
let targetId = input.pendingMessage()
if (!targetId && !clearing) targetId = messageIdFromHash(location.hash)
if (!targetId) return
if (messageById().has(targetId)) return
if (!input.historyMore() || input.historyLoading()) return
void input.loadMore(sessionID)
})
onMount(() => {
if (typeof window !== "undefined" && "scrollRestoration" in window.history) {
window.history.scrollRestoration = "manual"
}
})
onCleanup(cancel)
return {
clearMessageHash,
scrollToMessage,
applyHash,
}
}
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