import Taro from '@tarojs/taro';
import {
  applyShareTitleTemplate,
  DEFAULT_SHARE_DESC,
  DEFAULT_SHARE_HINT,
  DEFAULT_SHARE_TITLE,
  resolveMiniShareRuntime,
  type ClientRuntimeConfig,
  type MiniShareRuntime,
  type MiniShareSceneConfig,
} from '@dukang/shared-types';
import { toast } from './api';
import { getBrandAssetsSync, loadBrandAssets } from './brand-assets';
import { fetchClientConfig } from './pay-wechat';

export type ShareScene =
  | 'home'
  | 'stores'
  | 'storeDetail'
  | 'benefit'
  | 'mine'
  | 'productDetail'
  | 'orderDetail';

export { DEFAULT_SHARE_TITLE, DEFAULT_SHARE_DESC };

export const WECHAT_SHARE_HINT = DEFAULT_SHARE_HINT;

const FALLBACK_SHARE: MiniShareRuntime = resolveMiniShareRuntime({});

let shareCached: MiniShareRuntime | null = null;

export function getShareRuntimeSync(): MiniShareRuntime {
  return shareCached ?? FALLBACK_SHARE;
}

export function applyShareFromClientConfig(config?: ClientRuntimeConfig | null) {
  if (config?.share) {
    shareCached = config.share;
    return shareCached;
  }
  return getShareRuntimeSync();
}

export async function loadShareConfig(force = false): Promise<MiniShareRuntime> {
  if (!force && shareCached) return shareCached;
  try {
    const cfg = await fetchClientConfig();
    if (cfg?.share) {
      shareCached = cfg.share;
      return shareCached;
    }
  } catch {
    /* ignore */
  }
  shareCached = FALLBACK_SHARE;
  return shareCached;
}

export function getDefaultShareImageUrl(): string {
  const share = getShareRuntimeSync();
  return share.default.imageUrl || getBrandAssetsSync().brandLogoUrl;
}

export function getShareHint(): string {
  return getShareRuntimeSync().hint || DEFAULT_SHARE_HINT;
}

export function prefetchShareBrandAssets() {
  void loadBrandAssets();
  void loadShareConfig();
}

function sceneConfig(scene?: ShareScene): MiniShareSceneConfig {
  const runtime = getShareRuntimeSync();
  if (!scene) return runtime.default;
  return runtime[scene] ?? runtime.default;
}

export type PageSharePayload = {
  title?: string;
  desc?: string;
  path?: string;
  imgUrl?: string;
  link?: string;
};

export function buildSceneSharePayload(
  scene: ShareScene,
  options?: {
    path?: string;
    dynamicTitle?: string | null;
    dynamicDesc?: string | null;
    dynamicImageUrl?: string | null;
    titleVars?: Record<string, string | undefined | null>;
  },
): PageSharePayload {
  const def = getShareRuntimeSync().default;
  const sc = sceneConfig(scene);
  const preferEntity = scene === 'productDetail' || scene === 'storeDetail';

  let title: string;
  if (preferEntity) {
    title = (options?.dynamicTitle || '').trim() || def.title;
  } else {
    title = (sc.title || '').trim();
    if (title && options?.titleVars) {
      const vars = options.titleVars;
      const missingRequired = Object.entries(vars).some(
        ([key, value]) => title.includes(`{${key}}`) && !(value != null && String(value).trim()),
      );
      title = missingRequired ? '' : applyShareTitleTemplate(title, vars);
    }
    if (!title) {
      title = (options?.dynamicTitle || '').trim() || def.title;
    }
  }

  const desc = (sc.desc || '').trim() || (options?.dynamicDesc || '').trim() || def.desc;
  const imgUrl = preferEntity
    ? (options?.dynamicImageUrl || '').trim() || def.imageUrl || getDefaultShareImageUrl()
    : (sc.imageUrl || '').trim() ||
      (options?.dynamicImageUrl || '').trim() ||
      def.imageUrl ||
      getDefaultShareImageUrl();

  return {
    title,
    desc,
    path: options?.path,
    imgUrl,
  };
}

export async function applyWechatShare(): Promise<void> {
  /* weapp 使用原生分享菜单，无 H5 JSSDK */
}

export async function handleShareButtonClick(
  payload?: PageSharePayload,
): Promise<{ showGuide: boolean }> {
  try {
    await Taro.showShareMenu({
      withShareTicket: true,
      showShareItems: ['shareAppMessage', 'shareTimeline'],
    });
  } catch {
    try {
      await Taro.showShareMenu({ withShareTicket: true });
    } catch {
      /* ignore */
    }
  }
  toast(getShareHint());
  void payload;
  return { showGuide: false };
}

export function toWeappShareMessage(payload?: PageSharePayload) {
  const def = getShareRuntimeSync().default;
  return {
    title: payload?.title || def.title,
    path: payload?.path || '/pages/home/index',
    imageUrl: payload?.imgUrl || getDefaultShareImageUrl(),
  };
}

export function toWeappShareTimeline(payload?: PageSharePayload, query = '') {
  const def = getShareRuntimeSync().default;
  return {
    title: payload?.title || def.title,
    query,
    imageUrl: payload?.imgUrl || getDefaultShareImageUrl(),
  };
}