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import { createEffect, createRoot } from "solid-js"
import { createStore, produce } from "solid-js/store"
import { Persist, persisted } from "@/utils/persist"
import { createScopedCache } from "@/utils/scoped-cache"
import type { FileViewState, SelectedLineRange } from "./types"
const WORKSPACE_KEY = "__workspace__"
const MAX_FILE_VIEW_SESSIONS = 20
const MAX_VIEW_FILES = 500
function normalizeSelectedLines(range: SelectedLineRange): SelectedLineRange {
if (range.start <= range.end) return { ...range }
const startSide = range.side
const endSide = range.endSide ?? startSide
return {
...range,
start: range.end,
end: range.start,
side: endSide,
endSide: startSide !== endSide ? startSide : undefined,
}
}
function equalSelectedLines(a: SelectedLineRange | null | undefined, b: SelectedLineRange | null | undefined) {
if (!a && !b) return true
if (!a || !b) return false
const left = normalizeSelectedLines(a)
const right = normalizeSelectedLines(b)
return (
left.start === right.start && left.end === right.end && left.side === right.side && left.endSide === right.endSide
)
}
function createViewSession(dir: string, id: string | undefined) {
const legacyViewKey = `${dir}/file${id ? "/" + id : ""}.v1`
const [view, setView, _, ready] = persisted(
Persist.scoped(dir, id, "file-view", [legacyViewKey]),
createStore<{
file: Record<string, FileViewState>
}>({
file: {},
}),
)
const meta = { pruned: false }
const pruneView = (keep?: string) => {
const keys = Object.keys(view.file)
if (keys.length <= MAX_VIEW_FILES) return
const drop = keys.filter((key) => key !== keep).slice(0, keys.length - MAX_VIEW_FILES)
if (drop.length === 0) return
setView(
produce((draft) => {
for (const key of drop) {
delete draft.file[key]
}
}),
)
}
createEffect(() => {
if (!ready()) return
if (meta.pruned) return
meta.pruned = true
pruneView()
})
const scrollTop = (path: string) => view.file[path]?.scrollTop
const scrollLeft = (path: string) => view.file[path]?.scrollLeft
const selectedLines = (path: string) => view.file[path]?.selectedLines
const setScrollTop = (path: string, top: number) => {
setView(
produce((draft) => {
const file = draft.file[path] ?? (draft.file[path] = {})
if (file.scrollTop === top) return
file.scrollTop = top
}),
)
pruneView(path)
}
const setScrollLeft = (path: string, left: number) => {
setView(
produce((draft) => {
const file = draft.file[path] ?? (draft.file[path] = {})
if (file.scrollLeft === left) return
file.scrollLeft = left
}),
)
pruneView(path)
}
const setSelectedLines = (path: string, range: SelectedLineRange | null) => {
const next = range ? normalizeSelectedLines(range) : null
setView(
produce((draft) => {
const file = draft.file[path] ?? (draft.file[path] = {})
if (equalSelectedLines(file.selectedLines, next)) return
file.selectedLines = next
}),
)
pruneView(path)
}
return {
ready,
scrollTop,
scrollLeft,
selectedLines,
setScrollTop,
setScrollLeft,
setSelectedLines,
}
}
export function createFileViewCache() {
const cache = createScopedCache(
(key) => {
const split = key.lastIndexOf("\n")
const dir = split >= 0 ? key.slice(0, split) : key
const id = split >= 0 ? key.slice(split + 1) : WORKSPACE_KEY
return createRoot((dispose) => ({
value: createViewSession(dir, id === WORKSPACE_KEY ? undefined : id),
dispose,
}))
},
{
maxEntries: MAX_FILE_VIEW_SESSIONS,
dispose: (entry) => entry.dispose(),
},
)
return {
load: (dir: string, id: string | undefined) => {
const key = `${dir}\n${id ?? WORKSPACE_KEY}`
return cache.get(key).value
},
clear: () => cache.clear(),
}
}
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