import type {
  AppearanceColorSchemeResult,
  AppLifecycleEventPayload,
  FileExportImagePayload,
  FileExportImageResult,
  FileExportTextPayload,
  FileExportTextResult,
  HapticsImpactPayload,
  HostBridgeCapability,
  HostBridgeMethod,
  HostBridgeRuntimeResult,
  OpenExternalUrlPayload,
  SetBadgeCountPayload,
  ShareOpenPayload,
} from '../../../packages/shared/src/contracts/hostBridge';
import {
  isHostBridgeCapability,
  normalizeHostBridgeBadgeCount,
  normalizeHostBridgeColorScheme,
  normalizeHostBridgeExternalUrl,
  normalizeHostBridgeLifecycleState,
} from '../../../packages/shared/src/contracts/hostBridge';
import type {
  WechatMiniProgramPayParams,
  WechatMiniProgramVirtualPayParams,
} from '../../../packages/shared/src/contracts/runtime';
import {
  canUseNativeAppHostBridge,
  requestNativeAppHostBridge,
  subscribeNativeAppHostBridgeEvent,
} from './nativeAppHostBridge';

const WECHAT_JS_SDK_URL = 'https://res.wx.qq.com/open/js/jweixin-1.6.0.js';
const MINI_PROGRAM_AUTH_PAGE_URL =
  '/pages/web-view/index?authAction=login&returnTo=previous';
const MINI_PROGRAM_PAY_PAGE_URL = '/pages/wechat-pay/index';
const MINI_PROGRAM_SHARE_GRID_PAGE_URL = '/pages/share-grid/index';

export type HostRuntimeKind =
  | 'browser'
  | 'wechat_mini_program'
  | 'native_app';

export type HostRuntimeSnapshot = {
  kind: HostRuntimeKind;
  clientType: string | null;
  clientRuntime: string | null;
  hostShell: string | null;
  hostPlatform: string | null;
  hostVersion: string | null;
  hostCapabilities: HostBridgeCapability[];
  miniProgramEnv: string | null;
};

export type HostRuntimeContext = {
  location?: Pick<Location, 'search'> | null;
  navigator?: Partial<Pick<Navigator, 'userAgent'>> | null;
  wx?: Window['wx'] | null;
  tauri?: Window['__TAURI__'] | null;
  reactNativeWebView?: Window['ReactNativeWebView'] | null;
};

export type HostNativePageNavigationOptions = {
  errorMessage?: string;
  beforeNavigate?: () => void;
};

export type HostPaymentRequest = {
  payload:
    | WechatMiniProgramPayParams
    | WechatMiniProgramVirtualPayParams
    | null
    | undefined;
  orderId: string;
};

export type HostShareGridRequest = {
  imageUrl: string;
  title: string;
  publicWorkCode: string;
};

export type HostFileExportTextRequest = FileExportTextPayload;

export type HostFileExportImageRequest = FileExportImagePayload;

export type HostClipboardWriteTextRequest = {
  text: string;
};

export type HostHapticsImpactRequest = HapticsImpactPayload;

export type HostAppTitleRequest = {
  title: string;
};

export type HostAppBadgeCountRequest = SetBadgeCountPayload;

export type HostShareOpenRequest = ShareOpenPayload;

export type HostExternalUrlRequest = OpenExternalUrlPayload;

export type HostAppearanceColorSchemeSnapshot = AppearanceColorSchemeResult;

export type HostAppLifecycleSnapshot = AppLifecycleEventPayload;

const HOST_RUNTIME_REFRESH_TIMEOUT_MS = 3000;

let cachedNativeHostRuntime: HostBridgeRuntimeResult | null = null;
let nativeHostRuntimeRefreshPromise: Promise<HostBridgeRuntimeResult | null> | null =
  null;
const hostRuntimeChangeListeners = new Set<() => void>();

function isUnsupportedHostBridgeError(error: unknown) {
  return (
    error instanceof Error &&
    (error.name === 'unsupported_method' ||
      error.name === 'unsupported_capability')
  );
}

function normalizeHostCapabilities(values: unknown): HostBridgeCapability[] {
  if (!Array.isArray(values)) {
    return [];
  }

  return values.filter(isHostBridgeCapability);
}

function mergeHostCapabilities(
  ...capabilityLists: Array<HostBridgeCapability[] | null | undefined>
) {
  return Array.from(
    new Set(capabilityLists.flatMap((capabilities) => capabilities ?? [])),
  );
}

function normalizeNativeHostRuntimeResult(
  runtime: HostBridgeRuntimeResult | null | undefined,
) {
  if (!runtime || typeof runtime !== 'object') {
    return null;
  }

  return {
    ...runtime,
    capabilities: normalizeHostCapabilities(runtime.capabilities),
  } satisfies HostBridgeRuntimeResult;
}

function updateCachedNativeHostRuntime(
  runtime: HostBridgeRuntimeResult | null,
) {
  const normalizedRuntime = normalizeNativeHostRuntimeResult(runtime);
  if (!normalizedRuntime) {
    return null;
  }

  cachedNativeHostRuntime = normalizedRuntime;
  hostRuntimeChangeListeners.forEach((listener) => listener());
  return normalizedRuntime;
}

export function subscribeHostRuntimeChange(listener: () => void) {
  hostRuntimeChangeListeners.add(listener);

  return () => {
    hostRuntimeChangeListeners.delete(listener);
  };
}

async function requestNativeHostBoolean(
  method: HostBridgeMethod,
  payload?: unknown,
) {
  try {
    return Boolean(await requestNativeAppHostBridge(method, payload));
  } catch (error) {
    if (isUnsupportedHostBridgeError(error)) {
      return false;
    }
    throw error;
  }
}

function resolveLocation(context: HostRuntimeContext) {
  return (
    context.location ?? (typeof window !== 'undefined' ? window.location : null)
  );
}

function resolveNavigator(context: HostRuntimeContext) {
  return (
    context.navigator ??
    (typeof navigator !== 'undefined' ? navigator : null)
  );
}

function resolveWxBridge(context: HostRuntimeContext) {
  return context.wx ?? (typeof window !== 'undefined' ? window.wx : null);
}

function resolveTauriBridge(context: HostRuntimeContext) {
  return (
    context.tauri ?? (typeof window !== 'undefined' ? window.__TAURI__ : null)
  );
}

function resolveReactNativeWebView(context: HostRuntimeContext) {
  return (
    context.reactNativeWebView ??
    (typeof window !== 'undefined' ? window.ReactNativeWebView : null)
  );
}

function hasWechatMiniProgramBridge(wxBridge: Window['wx'] | null | undefined) {
  return Boolean(
    wxBridge?.miniProgram?.postMessage || wxBridge?.miniProgram?.navigateTo,
  );
}

function isWechatMiniProgramUserAgent(userAgent: string) {
  const normalizedUserAgent = userAgent.toLowerCase();
  return (
    normalizedUserAgent.includes('micromessenger') &&
    normalizedUserAgent.includes('miniprogram')
  );
}

export function resolveHostRuntime(
  context: HostRuntimeContext = {},
): HostRuntimeSnapshot {
  const location = resolveLocation(context);
  const params = new URLSearchParams(location?.search ?? '');
  const clientType = params.get('clientType');
  const clientRuntime = params.get('clientRuntime');
  const hostShell = params.get('hostShell');
  const hostPlatform = params.get('hostPlatform');
  const hostVersion = params.get('hostVersion');
  const queryHostCapabilities = (params.get('hostCapabilities') ?? '')
    .split(',')
    .map((capability) => capability.trim())
    .filter(isHostBridgeCapability);
  const miniProgramEnv = params.get('miniProgramEnv');
  const navigatorLike = resolveNavigator(context);
  const wxBridge = resolveWxBridge(context);
  const tauriBridge = resolveTauriBridge(context);
  const reactNativeWebView = resolveReactNativeWebView(context);
  const nativeHostCapabilities = mergeHostCapabilities(
    queryHostCapabilities,
    cachedNativeHostRuntime?.capabilities,
  );

  if (
    clientRuntime === 'wechat_mini_program' ||
    clientType === 'mini_program' ||
    isWechatMiniProgramUserAgent(navigatorLike?.userAgent ?? '') ||
    hasWechatMiniProgramBridge(wxBridge)
  ) {
    return {
      kind: 'wechat_mini_program',
      clientType,
      clientRuntime,
      hostShell,
      hostPlatform,
      hostVersion,
      hostCapabilities: queryHostCapabilities,
      miniProgramEnv,
    };
  }

  if (
    clientRuntime === 'native_app' ||
    clientType === 'native_app' ||
    typeof tauriBridge?.core?.invoke === 'function' ||
    typeof reactNativeWebView?.postMessage === 'function'
  ) {
    return {
      kind: 'native_app',
      clientType,
      clientRuntime,
      hostShell,
      hostPlatform,
      hostVersion,
      hostCapabilities: nativeHostCapabilities,
      miniProgramEnv,
    };
  }

  return {
    kind: 'browser',
    clientType,
    clientRuntime,
    hostShell,
    hostPlatform,
    hostVersion,
    hostCapabilities: queryHostCapabilities,
    miniProgramEnv,
  };
}

export function getHostRuntime(context: HostRuntimeContext = {}) {
  return resolveHostRuntime(context);
}

export function isWechatMiniProgramWebViewRuntime(
  context: HostRuntimeContext = {},
) {
  return resolveHostRuntime(context).kind === 'wechat_mini_program';
}

export function isNativeAppRuntime(context: HostRuntimeContext = {}) {
  return resolveHostRuntime(context).kind === 'native_app';
}

export function canUseNativeHostCapability(
  capability: HostBridgeCapability,
  context: HostRuntimeContext = {},
) {
  const runtime = getHostRuntime(context);
  return (
    runtime.kind === 'native_app' &&
    runtime.hostCapabilities.includes(capability)
  );
}

export function loadWechatMiniProgramBridge(
  errorMessage = '请在微信小程序内完成操作',
) {
  if (
    typeof window === 'undefined' ||
    !isWechatMiniProgramWebViewRuntime()
  ) {
    return Promise.reject(new Error(errorMessage));
  }

  if (window.wx?.miniProgram?.navigateTo) {
    return Promise.resolve(window.wx);
  }

  return new Promise<NonNullable<Window['wx']>>((resolve, reject) => {
    const existingScript = document.querySelector<HTMLScriptElement>(
      `script[src="${WECHAT_JS_SDK_URL}"]`,
    );
    const complete = () => {
      if (window.wx?.miniProgram?.navigateTo) {
        resolve(window.wx);
      } else {
        reject(new Error(errorMessage));
      }
    };

    if (existingScript) {
      if (window.wx?.miniProgram?.navigateTo) {
        complete();
        return;
      }

      existingScript.addEventListener('load', complete, { once: true });
      existingScript.addEventListener(
        'error',
        () => reject(new Error(errorMessage)),
        { once: true },
      );
      return;
    }

    const script = document.createElement('script');
    script.src = WECHAT_JS_SDK_URL;
    script.async = true;
    script.onload = complete;
    script.onerror = () => reject(new Error(errorMessage));
    document.head.appendChild(script);
  });
}

export async function navigateWechatMiniProgramPage(
  url: string,
  errorMessage = '请在微信小程序内完成操作',
  options: Pick<HostNativePageNavigationOptions, 'beforeNavigate'> = {},
) {
  const wxBridge = await loadWechatMiniProgramBridge(errorMessage);
  const navigateTo = wxBridge.miniProgram?.navigateTo;
  if (typeof navigateTo !== 'function') {
    throw new Error(errorMessage);
  }

  await new Promise<void>((resolve, reject) => {
    options.beforeNavigate?.();
    navigateTo({
      url,
      success() {
        resolve();
      },
      fail(error) {
        reject(new Error(error?.errMsg || errorMessage));
      },
    });
  });
}

export async function navigateHostNativePage(
  url: string,
  options: HostNativePageNavigationOptions = {},
) {
  const runtime = getHostRuntime();
  if (runtime.kind === 'native_app') {
    if (!runtime.hostCapabilities.includes('navigation.openNativePage')) {
      return false;
    }
    const result = await requestNativeHostBoolean(
      'navigation.openNativePage',
      { url },
    );
    if (result) {
      options.beforeNavigate?.();
    }
    return result;
  }

  if (runtime.kind !== 'wechat_mini_program') {
    return false;
  }

  await navigateWechatMiniProgramPage(url, options.errorMessage, {
    beforeNavigate: options.beforeNavigate,
  });
  return true;
}

export async function requestHostLogin() {
  if (getHostRuntime().kind === 'native_app') {
    if (!canUseNativeHostCapability('auth.requestLogin')) {
      return false;
    }
    return await requestNativeHostBoolean('auth.requestLogin');
  }

  return await navigateHostNativePage(MINI_PROGRAM_AUTH_PAGE_URL, {
    errorMessage: '请在微信小程序内完成登录',
  });
}

export async function requestWechatMiniProgramPhoneLogin() {
  return await requestHostLogin();
}

export async function requestHostPayment({
  payload,
  orderId,
}: HostPaymentRequest) {
  const runtime = getHostRuntime();
  if (runtime.kind === 'native_app') {
    if (!runtime.hostCapabilities.includes('payment.request')) {
      return false;
    }
    return await requestNativeHostBoolean('payment.request', {
      payload,
      orderId,
    });
  }

  if (runtime.kind !== 'wechat_mini_program') {
    return false;
  }

  if (!payload) {
    throw new Error('请在微信小程序内完成支付');
  }

  const requestId = `wechat_pay_${orderId}_${Date.now()}`;
  const searchParams = new URLSearchParams({
    requestId,
    orderId,
    payParams: JSON.stringify(payload),
  });

  await navigateWechatMiniProgramPage(
    `${MINI_PROGRAM_PAY_PAGE_URL}?${searchParams.toString()}`,
    '请在微信小程序内完成支付',
  );
  return true;
}

export async function requestWechatMiniProgramPayment(
  payload:
    | WechatMiniProgramPayParams
    | WechatMiniProgramVirtualPayParams
    | null
    | undefined,
  orderId: string,
) {
  const handled = await requestHostPayment({ payload, orderId });
  if (!handled) {
    throw new Error('请在微信小程序内完成支付');
  }
}

function buildAbsoluteUrl(value: string) {
  if (typeof window === 'undefined') {
    return value;
  }

  return new URL(value, window.location.origin).href;
}

function normalizeHostExternalUrl(url: string) {
  const trimmedUrl = url.trim();
  if (!trimmedUrl) {
    return null;
  }

  if (typeof window === 'undefined') {
    return normalizeHostBridgeExternalUrl(trimmedUrl);
  }

  try {
    return normalizeHostBridgeExternalUrl(
      new URL(trimmedUrl, window.location.origin).toString(),
    );
  } catch {
    return null;
  }
}

export function canUseHostShareGrid(context: HostRuntimeContext = {}) {
  return getHostRuntime(context).kind === 'wechat_mini_program';
}

export function canUseWechatMiniProgramShareGrid() {
  return canUseHostShareGrid();
}

export async function openHostShareGrid(params: HostShareGridRequest) {
  const imageUrl = params.imageUrl.trim();
  if (!imageUrl || !canUseHostShareGrid()) {
    return false;
  }

  const searchParams = new URLSearchParams({
    imageUrl: buildAbsoluteUrl(imageUrl),
    title: params.title.trim() || '我的作品',
    publicWorkCode: params.publicWorkCode.trim(),
  });

  try {
    return await navigateHostNativePage(
      `${MINI_PROGRAM_SHARE_GRID_PAGE_URL}?${searchParams.toString()}`,
      {
        errorMessage: 'wechat_js_sdk_unavailable',
      },
    );
  } catch {
    return false;
  }
}

export async function openWechatMiniProgramShareGridPage(
  params: HostShareGridRequest,
) {
  return await openHostShareGrid(params);
}

export function setHostShareTarget(message: unknown) {
  if (getHostRuntime().kind === 'native_app') {
    if (!canUseNativeHostCapability('share.setTarget')) {
      return false;
    }
    void requestNativeAppHostBridge('share.setTarget', {
      target: message,
    }).catch(() => {
      // 分享目标同步是宿主提示能力，失败不应打断当前 H5 流程。
    });
    return true;
  }

  if (
    typeof window === 'undefined' ||
    getHostRuntime().kind !== 'wechat_mini_program' ||
    typeof window.wx?.miniProgram?.postMessage !== 'function'
  ) {
    return false;
  }

  window.wx.miniProgram.postMessage({
    data: message,
  });
  return true;
}

export async function openHostShare(params: HostShareOpenRequest) {
  if (!canUseNativeHostCapability('share.open')) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('share.open', params);
  } catch {
    return false;
  }
}

export async function openHostExternalUrl({ url }: HostExternalUrlRequest) {
  if (!canUseNativeHostCapability('app.openExternalUrl')) {
    return false;
  }

  const normalizedUrl = normalizeHostExternalUrl(url);
  if (!normalizedUrl) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('app.openExternalUrl', {
      url: normalizedUrl,
    });
  } catch {
    return false;
  }
}

export function postWechatMiniProgramMessage(message: unknown) {
  return setHostShareTarget(message);
}

export async function getNativeAppHostRuntime() {
  const runtime = getHostRuntime();
  if (
    runtime.kind !== 'native_app' ||
    (!runtime.hostCapabilities.includes('host.getRuntime') &&
      !canUseNativeAppHostBridge())
  ) {
    return null;
  }

  try {
    return updateCachedNativeHostRuntime(
      await requestNativeAppHostBridge<HostBridgeRuntimeResult>(
        'host.getRuntime',
        undefined,
        { timeoutMs: HOST_RUNTIME_REFRESH_TIMEOUT_MS },
      ),
    );
  } catch (error) {
    if (isUnsupportedHostBridgeError(error)) {
      return null;
    }
    throw error;
  }
}

export function refreshNativeAppHostRuntime() {
  if (nativeHostRuntimeRefreshPromise) {
    return nativeHostRuntimeRefreshPromise;
  }

  nativeHostRuntimeRefreshPromise = getNativeAppHostRuntime()
    .catch(() => null)
    .finally(() => {
      nativeHostRuntimeRefreshPromise = null;
    });

  return nativeHostRuntimeRefreshPromise;
}

export function resetHostRuntimeCacheForTest() {
  cachedNativeHostRuntime = null;
  nativeHostRuntimeRefreshPromise = null;
  hostRuntimeChangeListeners.clear();
}

export async function writeHostClipboardText({
  text,
}: HostClipboardWriteTextRequest) {
  if (!canUseNativeHostCapability('clipboard.writeText')) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('clipboard.writeText', { text });
  } catch {
    return false;
  }
}

export async function exportHostTextFile(
  params: HostFileExportTextRequest,
) {
  if (!canUseNativeHostCapability('file.exportText')) {
    return false;
  }

  try {
    return await requestNativeAppHostBridge<FileExportTextResult>(
      'file.exportText',
      params,
      { timeoutMs: 30000 },
    );
  } catch (error) {
    if (isUnsupportedHostBridgeError(error)) {
      return false;
    }
    throw error;
  }
}

export async function exportHostImageFile(
  params: HostFileExportImageRequest,
) {
  if (!canUseNativeHostCapability('file.exportImage')) {
    return false;
  }

  try {
    return await requestNativeAppHostBridge<FileExportImageResult>(
      'file.exportImage',
      params,
      { timeoutMs: 30000 },
    );
  } catch (error) {
    if (isUnsupportedHostBridgeError(error)) {
      return false;
    }
    throw error;
  }
}

export async function requestHostHapticsImpact(
  params: HostHapticsImpactRequest = {},
) {
  if (!canUseNativeHostCapability('haptics.impact')) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('haptics.impact', params);
  } catch {
    return false;
  }
}

export async function setHostAppTitle({ title }: HostAppTitleRequest) {
  const normalizedTitle = title.trim();
  if (!normalizedTitle || !canUseNativeHostCapability('app.setTitle')) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('app.setTitle', {
      title: normalizedTitle,
    });
  } catch {
    return false;
  }
}

export async function setHostAppBadgeCount({
  count,
}: HostAppBadgeCountRequest) {
  const normalizedCount = normalizeHostBridgeBadgeCount(count);
  if (
    normalizedCount === null ||
    !canUseNativeHostCapability('app.setBadgeCount')
  ) {
    return false;
  }

  try {
    return await requestNativeHostBoolean('app.setBadgeCount', {
      count: normalizedCount,
    });
  } catch {
    return false;
  }
}

export async function getHostAppearanceColorScheme() {
  if (!canUseNativeHostCapability('appearance.getColorScheme')) {
    return false;
  }

  try {
    const result =
      await requestNativeAppHostBridge<AppearanceColorSchemeResult>(
        'appearance.getColorScheme',
      );
    return {
      colorScheme: normalizeHostBridgeColorScheme(result?.colorScheme),
    } satisfies HostAppearanceColorSchemeSnapshot;
  } catch {
    return false;
  }
}

export function subscribeHostAppLifecycle(
  listener: (payload: HostAppLifecycleSnapshot) => void,
) {
  if (!canUseNativeHostCapability('app.lifecycle')) {
    return () => undefined;
  }

  return subscribeNativeAppHostBridgeEvent<AppLifecycleEventPayload>(
    'app.lifecycle',
    (payload) => {
      const state = normalizeHostBridgeLifecycleState(payload?.state);
      listener({
        state,
        focused: typeof payload?.focused === 'boolean'
          ? payload.focused
          : state === 'active',
        ...(typeof payload?.nativeState === 'string'
          ? { nativeState: payload.nativeState }
          : {}),
      });
    },
  );
}