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<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>流式聊天Demo</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 20px;
            background-color: #f5f5f5;
        }
        .chat-container {
            max-width: 800px;
            margin: 0 auto;
            background-color: white;
            border-radius: 10px;
            box-shadow: 0 0 10px rgba(0,0,0,0.1);
            padding: 20px;
        }
        .chat-messages {
            height: 500px;
            overflow-y: auto;
            border: 1px solid #ddd;
            border-radius: 5px;
            padding: 10px;
            margin-bottom: 20px;
        }
        .message {
            margin-bottom: 15px;
            padding: 10px;
            border-radius: 5px;
        }
        .user-message {
            background-color: #e3f2fd;
            text-align: right;
        }
        .bot-message {
            background-color: #f5f5f5;
        }
        .input-container {
            display: flex;
            gap: 10px;
        }
        #userInput {
            flex: 1;
            padding: 10px;
            border: 1px solid #ddd;
            border-radius: 5px;
            font-size: 16px;
        }
        button {
            padding: 10px 20px;
            background-color: #4CAF50;
            color: white;
            border: none;
            border-radius: 5px;
            cursor: pointer;
            font-size: 16px;
        }
        button:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>
<div class="chat-container">
    <div class="chat-messages" id="chatMessages"></div>
    <div class="input-container">
        <input type="text" id="userInput" placeholder="请输入消息...">
        <button onclick="sendMessage()">发送</button>
    </div>
</div>

<script>

    function sendMessage() {
        const userInput = document.getElementById('userInput');
        const message = userInput.value.trim();
        if (!message) return;

        addMessage(message, 'user');
        userInput.value = '';

        // 创建唯一ID的占位消息用于增量更新
        const placeholderId = `bot-${Date.now()}`;
        addMessage('', 'bot', placeholderId); // 初始为空内容

        fetch('http://127.0.0.1:26061/dify/stream/chat', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({
                query: message,
                userId: 123,
                conversationId: null
            })
        })
            .then(response => {
                const reader = response.body.getReader();
                const decoder = new TextDecoder('utf-8');
                let buffer = '';
                let partialChunk = '';

                const processData = (dataStr) => {
                    const lines = (partialChunk + dataStr).split('\n');
                    partialChunk = lines.pop() || ''; // 保存未完成的行

                    for (const line of lines) {
                        if (line.startsWith('data: ')) {
                            try {
                                const data = JSON.parse(line.slice(6)); // 提取JSON数据
                                const answerChunk = data.answer;
                                // 关键修改：追加内容而非覆盖
                                const el = document.getElementById(placeholderId);
                                if (el) {
                                    el.textContent += answerChunk; // 使用 += 实现增量
                                    el.scrollIntoView({ behavior: 'smooth' });
                                }
                            } catch (e) {
                                console.error('解析错误:', e);
                            }
                        }
                    }
                };

                const readStream = () => {
                    reader.read().then(({ done, value }) => {
                        if (done) {
                            // 流结束后的清理工作
                            if (partialChunk) processData('');
                            return;
                        }
                        buffer += decoder.decode(value, { stream: true });
                        processData(buffer);
                        buffer = '';
                        readStream();
                    });
                };

                readStream();
            })
            .catch(err => {
                console.error('请求失败:', err);
                addMessage('请求出错，请稍后重试', 'bot');
            });
    }

    // 辅助函数：添加消息到聊天窗口
    function addMessage(text, sender, messageId) {
        const chatMessages = document.getElementById('chatMessages');
        const messageDiv = document.createElement('div');
        messageDiv.id = messageId || '';
        messageDiv.className = `message ${sender}-message`;
        messageDiv.textContent = text;
        chatMessages.appendChild(messageDiv);
        messageDiv.scrollIntoView({ behavior: 'smooth' });
    }


</script>
</body>
</html>