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import { createStore, produce, reconcile } from "solid-js/store"
import type { FileNode } from "@opencode-ai/sdk/v2"
type DirectoryState = {
expanded: boolean
loaded?: boolean
loading?: boolean
error?: string
children?: string[]
}
type TreeStoreOptions = {
scope: () => string
normalizeDir: (input: string) => string
list: (input: string) => Promise<FileNode[]>
onError: (message: string) => void
}
export function createFileTreeStore(options: TreeStoreOptions) {
const [tree, setTree] = createStore<{
node: Record<string, FileNode>
dir: Record<string, DirectoryState>
}>({
node: {},
dir: { "": { expanded: true } },
})
const inflight = new Map<string, Promise<void>>()
const reset = () => {
inflight.clear()
setTree("node", reconcile({}))
setTree("dir", reconcile({}))
setTree("dir", "", { expanded: true })
}
const ensureDir = (path: string) => {
if (tree.dir[path]) return
setTree("dir", path, { expanded: false })
}
const listDir = (input: string, opts?: { force?: boolean }) => {
const dir = options.normalizeDir(input)
ensureDir(dir)
const current = tree.dir[dir]
if (!opts?.force && current?.loaded) return Promise.resolve()
const pending = inflight.get(dir)
if (pending) return pending
setTree(
"dir",
dir,
produce((draft) => {
draft.loading = true
draft.error = undefined
}),
)
const directory = options.scope()
const promise = options
.list(dir)
.then((nodes) => {
if (options.scope() !== directory) return
const prevChildren = tree.dir[dir]?.children ?? []
const nextChildren = nodes.map((node) => node.path)
const nextSet = new Set(nextChildren)
setTree(
"node",
produce((draft) => {
const removedDirs: string[] = []
for (const child of prevChildren) {
if (nextSet.has(child)) continue
const existing = draft[child]
if (existing?.type === "directory") removedDirs.push(child)
delete draft[child]
}
if (removedDirs.length > 0) {
const keys = Object.keys(draft)
for (const key of keys) {
for (const removed of removedDirs) {
if (!key.startsWith(removed + "/")) continue
delete draft[key]
break
}
}
}
for (const node of nodes) {
draft[node.path] = node
}
}),
)
setTree(
"dir",
dir,
produce((draft) => {
draft.loaded = true
draft.loading = false
draft.children = nextChildren
}),
)
})
.catch((e) => {
if (options.scope() !== directory) return
setTree(
"dir",
dir,
produce((draft) => {
draft.loading = false
draft.error = e.message
}),
)
options.onError(e.message)
})
.finally(() => {
inflight.delete(dir)
})
inflight.set(dir, promise)
return promise
}
const expandDir = (input: string) => {
const dir = options.normalizeDir(input)
ensureDir(dir)
setTree("dir", dir, "expanded", true)
void listDir(dir)
}
const collapseDir = (input: string) => {
const dir = options.normalizeDir(input)
ensureDir(dir)
setTree("dir", dir, "expanded", false)
}
const dirState = (input: string) => {
const dir = options.normalizeDir(input)
return tree.dir[dir]
}
const children = (input: string) => {
const dir = options.normalizeDir(input)
const ids = tree.dir[dir]?.children
if (!ids) return []
const out: FileNode[] = []
for (const id of ids) {
const node = tree.node[id]
if (node) out.push(node)
}
return out
}
return {
listDir,
expandDir,
collapseDir,
dirState,
children,
node: (path: string) => tree.node[path],
isLoaded: (path: string) => Boolean(tree.dir[path]?.loaded),
reset,
}
}
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