import Taro from '@tarojs/taro';
import { CLIENT_APP, getToken, API_BASE } from './api';

export type ClientErrorLevel = 'fatal' | 'error' | 'warn';
export type ClientErrorCategory =
  | 'js_error'
  | 'unhandled_rejection'
  | 'api_error'
  | 'network'
  | 'render'
  | 'bridge'
  | 'other';

export type ClientErrorPayload = {
  level: ClientErrorLevel;
  category: ClientErrorCategory;
  message: string;
  stack?: string;
  pagePath?: string;
  extra?: Record<string, unknown>;
};

function currentPagePath(): string | undefined {
  try {
    const pages = Taro.getCurrentPages();
    const cur = pages[pages.length - 1] as { route?: string; $taroPath?: string } | undefined;
    return cur?.$taroPath || cur?.route || undefined;
  } catch {
    return undefined;
  }
}

/** 上报客户端错误（失败静默，避免递归） */
export function reportClientError(payload: ClientErrorPayload): void {
  const body = {
    level: payload.level,
    category: payload.category,
    message: String(payload.message || 'unknown').slice(0, 1000),
    stack: payload.stack ? String(payload.stack).slice(0, 4000) : undefined,
    pagePath: payload.pagePath || currentPagePath(),
    clientApp: CLIENT_APP,
    extra: payload.extra,
  };

  const header: Record<string, string> = {
    'Content-Type': 'application/json',
    'X-Client-App': CLIENT_APP,
  };
  const token = getToken();
  if (token) header.Authorization = `Bearer ${token}`;

  void Taro.request({
    url: `${API_BASE}/common/client-errors`,
    method: 'POST',
    data: body,
    header,
  }).catch(() => {});
}

let installed = false;

/** 安装小程序/H5 全局未捕获错误钩子（幂等） */
export function installClientErrorReporting(): void {
  if (installed) return;
  installed = true;

  try {
    Taro.onError?.((msg) => {
      reportClientError({
        level: 'fatal',
        category: 'js_error',
        message: typeof msg === 'string' ? msg : String(msg),
      });
    });
  } catch {
    /* ignore */
  }

  try {
    Taro.onUnhandledRejection?.((res) => {
      const reason = (res as { reason?: unknown })?.reason;
      const message =
        reason instanceof Error
          ? reason.message
          : typeof reason === 'string'
            ? reason
            : JSON.stringify(reason);
      const stack = reason instanceof Error ? reason.stack : undefined;
      reportClientError({
        level: 'error',
        category: 'unhandled_rejection',
        message: message || 'UnhandledRejection',
        stack,
      });
    });
  } catch {
    /* ignore */
  }

  if (typeof window !== 'undefined') {
    window.addEventListener('error', (ev) => {
      reportClientError({
        level: 'fatal',
        category: 'js_error',
        message: ev.message || 'window.error',
        stack: ev.error instanceof Error ? ev.error.stack : undefined,
        extra: { filename: ev.filename, lineno: ev.lineno, colno: ev.colno },
      });
    });
    window.addEventListener('unhandledrejection', (ev) => {
      const reason = ev.reason;
      reportClientError({
        level: 'error',
        category: 'unhandled_rejection',
        message:
          reason instanceof Error
            ? reason.message
            : typeof reason === 'string'
              ? reason
              : 'unhandledrejection',
        stack: reason instanceof Error ? reason.stack : undefined,
      });
    });
  }
}