import { logout, refresh, getPendingRefresh } from './auth.js'
import { session, signOut, getSessionRevision, decodeAccessToken } from '../stores/session.js'

function replacementForCapturedSession(captured, tokens) {
	if (!tokens?.accessToken || typeof tokens.refreshToken !== 'string' || !tokens.refreshToken.trim()) {
		throw new Error('退出刷新响应缺少会话凭据')
	}
	const previous = decodeAccessToken(captured.accessToken)
	const replacement = decodeAccessToken(tokens.accessToken)
	if (!Number.isFinite(Number(replacement?.exp)) || Number(replacement.exp) * 1000 <= Date.now()) {
		throw new Error('退出刷新凭据无效或已过期')
	}
	for (const name of ['user_id', 'membership_id', 'tenant_id', 'app_code', 'overseas_warehouse_id']) {
		if (previous[name] == null || String(previous[name]) !== String(replacement[name])) {
			throw new Error('退出刷新返回了不同作业主体，无法确认原会话撤销')
		}
	}
	return { accessToken: tokens.accessToken, refreshToken: tokens.refreshToken }
}

// Active user logout only. Ordinary authentication failures continue to use local signOut.
export function logoutCurrentSession() {
	const captured = {
		accessToken: session.token, refreshToken: session.refreshToken,
		pendingRefresh: getPendingRefresh(session.refreshToken)
	}
	signOut()
	const clearedRevision = getSessionRevision()
	const revoke = async () => {
		if (!captured.accessToken || !captured.refreshToken) return { revoked: false, reason: 'NO_CAPTURED_SESSION' }
		let credentials = captured
		let refreshed = false
		if (captured.pendingRefresh) {
			// Auth rotates access/refresh credentials. Revoke the captured refresh's result,
			// while the business refresh wrapper's revision guard prevents local restoration.
			refreshed = true
			credentials = replacementForCapturedSession(captured, await captured.pendingRefresh)
		}
		try {
			await logout(credentials.accessToken, credentials.refreshToken)
		} catch (error) {
			if (error.network || error.statusCode !== 401 || refreshed) throw error
			// Only an explicit expired-access HTTP 401 permits one refresh and one revoke.
			credentials = replacementForCapturedSession(captured, await refresh(captured.refreshToken))
			await logout(credentials.accessToken, credentials.refreshToken)
		}
		return { revoked: true }
	}
	return revoke().then(result => ({ ...result, clearedRevision }), error => {
		error.logoutRevision = clearedRevision
		throw error
	})
}