import type { RefComponentMountAdapter } from '../types/refComponentMount';
import { defaultDomMountAdapter } from './defaultDomMountAdapter';
import { createBrowserRequiredError } from '../env';
import {
  mergeNativeAdapter,
  resolveNativeRefComponentMount,
  clearNativeRefComponentMount,
} from './nativeRuntimeAdapter';

/** 声明不支持命令式挂载时的占位适配器 */
const unsupportedMountAdapter: RefComponentMountAdapter = {
  id: 'native-unsupported',
  mount() {
    return Promise.reject(new Error(
      '[use-modal-ref] refComponentMount is null on mergeNativeAdapter — '
      + 'imperative mount is not supported in this environment.',
    ));
  },
};

/**
 * 注册全局命令式挂载（兼容 API，等价于 mergeNativeAdapter({ refComponentMount })）。
 * @param adapter - 自定义挂载适配器
 * @returns 当前生效的适配器
 */
function mergeRefComponentMount(adapter: RefComponentMountAdapter): RefComponentMountAdapter {
  mergeNativeAdapter({ refComponentMount: adapter });
  return adapter;
}

/**
 * 解析本次挂载应使用的适配器：单次 override > native > 默认 DOM。
 * @param override - 单次调用传入的适配器
 * @returns 挂载适配器
 */
function getRefComponentMountAdapter(
  override?: RefComponentMountAdapter,
): RefComponentMountAdapter {
  if (override) {
    return override;
  }
  const native = resolveNativeRefComponentMount();
  if (native.kind === 'adapter') {
    return native.adapter;
  }
  if (native.kind === 'none') {
    return unsupportedMountAdapter;
  }
  return defaultDomMountAdapter;
}

/**
 * 是否使用内置 DOM 适配器（无 override 且无 native 注入时）。
 * @param override - 单次调用传入的适配器
 * @returns 是否为默认 DOM 实现
 */
function isDefaultDomMountAdapter(override?: RefComponentMountAdapter): boolean {
  return getRefComponentMountAdapter(override) === defaultDomMountAdapter;
}

/**
 * 重置全局挂载适配器（兼容 API）。
 */
function resetRefComponentMountAdapter(): void {
  clearNativeRefComponentMount();
}

/**
 * 无 DOM 时构造命令式 API 环境错误。
 * @param apiName - API 名称
 * @returns Error
 */
function createImperativeMountEnvironmentError(apiName: string): Error {
  const native = resolveNativeRefComponentMount();
  if (native.kind === 'none') {
    return new Error(
      `[use-modal-ref] ${apiName} is not supported — refComponentMount is null on mergeNativeAdapter.`,
    );
  }
  return createBrowserRequiredError(apiName);
}

export {
  mergeRefComponentMount,
  getRefComponentMountAdapter,
  isDefaultDomMountAdapter,
  resetRefComponentMountAdapter,
  defaultDomMountAdapter,
  createImperativeMountEnvironmentError,
  unsupportedMountAdapter,
};