// src/utils/ai_stream.js  (H5 优化版)
import {
	getToken
} from '@/utils/auth';

const BASE_URL = (() => {
	// #ifdef H5
	return 'http://localhost:8088';
	// #endif
	// #ifndef H5
	// return 'http://192.168.x.x:8088'; // 换成你的电脑 IP
	// #endif
})();

export function createChatStream(params) {
	const requestId = `req-${Date.now()}-${Math.random().toString(36).slice(2, 8)}`;
	const url = `${BASE_URL}/aitutor/aichat/stream`;
	const token = getToken();
	if (!token) throw new Error('请先登录');

	const controller = new AbortController();

	const fetchPromise = fetch(url, {
			method: 'POST',
			headers: {
				'Accept': 'text/event-stream',
				'Content-Type': 'application/json',
				'Authorization': `Bearer ${token}`,
				'X-Request-ID': requestId
			},
			body: JSON.stringify({
				query: params.prompt,
				user_id: params.userId,
				user_name: params.userName,
				user_token: params.user_token || '123', 
				user_role: 'student',
				conversation_id: params.conversationId || null, 
			}),
			signal: controller.signal
		})
		.then(resp => {
			if (!resp.ok) throw new Error(`HTTP ${resp.status}`);
			if (!resp.body) throw new Error('Response body is null');
			return resp.body;
		});

	return fetchPromise.then(body => ({
		stream: Promise.resolve({
			reader: body.getReader(),
			decoder: new TextDecoder('utf-8')
		}),
		cancel: reason => !controller.signal.aborted && controller.abort(reason)
	})).catch(err => ({
		stream: Promise.reject(err),
		cancel: () => {}
	}));
}