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/** Test double for the client settings-scope seam. */
import { vi } from 'vitest'
import type {
  SettingsScope, SettingsScopeSnapshot,
} from '@deepseek-ai/dsh-client-ui-settings/client'

/** Handle over one stubbed scope: the scope, its write spy, and publication controls. */
export interface StubSettingsScope<T> {
  /** The scope face handed to the service under test. */
  scope: SettingsScope<T>
  /** Spy behind `scope.set`; resolves immediately. */
  set: ReturnType<typeof vi.fn>
  /** Spy behind `scope.mutate`; resolves immediately. */
  mutate: ReturnType<typeof vi.fn>
  /** Spy behind `scope.unset`; resolves immediately. */
  unset: ReturnType<typeof vi.fn>
  /** @returns how many listeners are currently subscribed (disposal assertions). */
  listenerCount(): number
  /**
   * Replace part of the snapshot and notify subscribers, as a Host
   * acceptance would.
   * @param next - snapshot fields to replace.
   */
  publish(next: Partial<SettingsScopeSnapshot<T>>): void
}

/**
 * Build an in-memory settings scope for service specs: starts in the host
 * loading state, records writes, and lets the test publish Host acceptances.
 * @returns the stub handle.
 */
export function stubSettingsScope<T>(): StubSettingsScope<T> {
  let snapshot: SettingsScopeSnapshot<T> = {
    status: 'loading', value: undefined, base: undefined, user: undefined,
    revision: undefined, writable: false, mode: 'host',
  }
  const listeners = new Set<() => void>()
  const set = vi.fn(() => Promise.resolve())
  const mutate = vi.fn(() => Promise.resolve())
  const unset = vi.fn(() => Promise.resolve())
  return {
    scope: {
      getSnapshot: () => snapshot,
      subscribe: (listener) => {
        listeners.add(listener)
        return () => { listeners.delete(listener) }
      },
      mutate,
      set,
      unset,
    },
    set,
    mutate,
    unset,
    listenerCount: () => listeners.size,
    publish: (next) => {
      snapshot = { ...snapshot, ...next }
      for (const listener of [...listeners]) listener()
    },
  }
}

	/** Test double for the client settings-scope seam. */
	import { vi } from 'vitest'
	import type {
	SettingsScope, SettingsScopeSnapshot,
	} from '@deepseek-ai/dsh-client-ui-settings/client'

	/** Handle over one stubbed scope: the scope, its write spy, and publication controls. */
	export interface StubSettingsScope<T> {
	/** The scope face handed to the service under test. */
	scope: SettingsScope<T>
	/** Spy behind `scope.set`; resolves immediately. */
	set: ReturnType<typeof vi.fn>
	/** Spy behind `scope.mutate`; resolves immediately. */
	mutate: ReturnType<typeof vi.fn>
	/** Spy behind `scope.unset`; resolves immediately. */
	unset: ReturnType<typeof vi.fn>
	/** @returns how many listeners are currently subscribed (disposal assertions). */
	listenerCount(): number
	/**
	* Replace part of the snapshot and notify subscribers, as a Host
	* acceptance would.
	* @param next - snapshot fields to replace.
	*/
	publish(next: Partial<SettingsScopeSnapshot<T>>): void
	}

	/**
	* Build an in-memory settings scope for service specs: starts in the host
	* loading state, records writes, and lets the test publish Host acceptances.
	* @returns the stub handle.
	*/
	export function stubSettingsScope<T>(): StubSettingsScope<T> {
	let snapshot: SettingsScopeSnapshot<T> = {
	status: 'loading', value: undefined, base: undefined, user: undefined,
	revision: undefined, writable: false, mode: 'host',
	}
	const listeners = new Set<() => void>()
	const set = vi.fn(() => Promise.resolve())
	const mutate = vi.fn(() => Promise.resolve())
	const unset = vi.fn(() => Promise.resolve())
	return {
	scope: {
	getSnapshot: () => snapshot,
	subscribe: (listener) => {
	listeners.add(listener)
	return () => { listeners.delete(listener) }
	},
	mutate,
	set,
	unset,
	},
	set,
	mutate,
	unset,
	listenerCount: () => listeners.size,
	publish: (next) => {
	snapshot = { ...snapshot, ...next }
	for (const listener of [...listeners]) listener()
	},
	}
	}