refactor: modularize launcher UI and native services with verified IO

src/hooks/useAccount.ts

@@ -0,0 +1,80 @@
+import { useEffect, useRef, useState } from 'react'
+import { errorMessage } from '../services/async'
+import { isNative, native, watchAccount } from '../services/native'
+import type { DeviceCodePayload, MinecraftProfile } from '../types/launcher'
+
+export function useAccount() {
+  // undefined = restoring saved account; null = signed out.
+  const [account, setAccount] = useState<MinecraftProfile | null | undefined>(isNative() ? undefined : null)
+  const [code, setCode] = useState<DeviceCodePayload | null>(null)
+  const [error, setError] = useState<string | null>(null)
+  const [busy, setBusy] = useState(false)
+  const [eventsReady, setEventsReady] = useState(false)
+  const pending = useRef(false)
+
+  useEffect(() => {
+    if (!isNative()) return
+    let active = true
+    let changed = false
+    const subscription = watchAccount({
+      code: (payload) => { if (active) setCode(payload) },
+      result: (payload) => {
+        if (!active) return
+        changed = true
+        pending.current = false
+        setBusy(false)
+        setCode(null)
+        if (payload.ok && payload.profile) {
+          setAccount(payload.profile)
+          setError(null)
+        } else setError(payload.error || 'Не удалось войти через Microsoft')
+      },
+    })
+    void subscription.ready.then(() => {
+      if (active) setEventsReady(true)
+    }).catch((reason: unknown) => {
+      if (active) setError(errorMessage(reason, 'Не удалось подготовить вход через Microsoft'))
+    })
+    void native.getAccount().then((profile) => {
+      if (active && !changed) setAccount(profile)
+    }).catch((reason: unknown) => {
+      if (!active || changed) return
+      setAccount(null)
+      setError(errorMessage(reason, 'Не удалось восстановить аккаунт'))
+    })
+    return () => { active = false; subscription.dispose() }
+  }, [])
+
+  const login = async () => {
+    if (!isNative() || !eventsReady || pending.current || account === undefined) return
+    pending.current = true
+    setBusy(true)
+    setCode(null)
+    setError(null)
+    try {
+      await native.startLogin()
+    } catch (reason) {
+      pending.current = false
+      setBusy(false)
+      setError(errorMessage(reason, 'Не удалось начать вход через Microsoft'))
+    }
+  }
+
+  const logout = async () => {
+    if (!isNative() || pending.current) return
+    pending.current = true
+    setBusy(true)
+    setError(null)
+    try {
+      await native.logout()
+      setAccount(null)
+    } catch (reason) {
+      setError(errorMessage(reason, 'Не удалось выйти из аккаунта'))
+    } finally {
+      pending.current = false
+      setBusy(false)
+    }
+  }
+
+  return { account, code, error, busy, eventsReady, login, logout }
+}