context-branching/app/web_chat.py at 80db398b694bd62153befc86b3408a48cac0fc47 · glanzz/context-branching · GitHub

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#!/usr/bin/env python3
"""
Flask Web Chat Application with Context Branching

A simple web interface demonstrating the Context Branching SDK.
Provides REST API endpoints and a basic HTML interface.

Usage:
    python web_chat.py [--port PORT] [--storage-path PATH]

API Endpoints:
    POST /api/workspace/create          - Create new workspace
    GET  /api/workspace/<id>/messages   - Get current context
    POST /api/workspace/<id>/message    - Add message
    POST /api/workspace/<id>/checkpoint - Create checkpoint
    POST /api/workspace/<id>/branch     - Create branch
    POST /api/workspace/<id>/switch     - Switch branch
    GET  /api/workspace/<id>/branches   - List branches
    GET  /api/workspace/<id>/checkpoints - List checkpoints
"""

import sys
from pathlib import Path

# Add parent directory to path to import SDK
sys.path.insert(0, str(Path(__file__).parent.parent))

from sdk import ContextBranchingSDK, Message
from flask import Flask, request, jsonify, render_template_string
from datetime import datetime
import argparse

# Import LLM utilities
try:
    from app.llm_utils import create_llm_from_env
    llm_client = create_llm_from_env()
    LLM_AVAILABLE = llm_client is not None
except ImportError:
    llm_client = None
    LLM_AVAILABLE = False


app = Flask(__name__)
sdk = None  # Will be initialized in main()


# HTML Template for the chat interface
HTML_TEMPLATE = """
<!DOCTYPE html>
<html>
<head>
    <title>Context Branching Chat</title>
    <style>
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            max-width: 1200px;
            margin: 0 auto;
            padding: 20px;
            background-color: #f5f5f5;
        }
        h1 {
            color: #333;
            border-bottom: 3px solid #2196F3;
            padding-bottom: 10px;
        }
        .container {
            display: flex;
            gap: 20px;
        }
        .chat-panel {
            flex: 2;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        .sidebar {
            flex: 1;
            background: white;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 2px 4px rgba(0,0,0,0.1);
        }
        .messages {
            height: 400px;
            overflow-y: auto;
            border: 1px solid #ddd;
            padding: 15px;
            margin-bottom: 20px;
            background: #fafafa;
            border-radius: 4px;
        }
        .message {
            margin-bottom: 15px;
            padding: 10px;
            border-radius: 6px;
        }
        .user-message {
            background-color: #E3F2FD;
            border-left: 4px solid #2196F3;
        }
        .assistant-message {
            background-color: #F1F8E9;
            border-left: 4px solid #4CAF50;
        }
        .input-area {
            display: flex;
            gap: 10px;
        }
        input[type="text"] {
            flex: 1;
            padding: 12px;
            border: 1px solid #ddd;
            border-radius: 4px;
            font-size: 14px;
        }
        button {
            padding: 12px 24px;
            background-color: #2196F3;
            color: white;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            font-size: 14px;
            font-weight: 600;
        }
        button:hover {
            background-color: #1976D2;
        }
        .branch-button {
            background-color: #4CAF50;
            margin: 5px;
            padding: 8px 16px;
            font-size: 13px;
        }
        .branch-button:hover {
            background-color: #45a049;
        }
        .current-branch {
            background-color: #FF9800;
            color: white;
            padding: 8px 16px;
            border-radius: 4px;
            display: inline-block;
            margin-bottom: 10px;
            font-weight: bold;
        }
        .control-panel {
            margin-top: 20px;
            padding: 15px;
            background: #f9f9f9;
            border-radius: 4px;
            border: 1px solid #ddd;
        }
        .control-panel input {
            margin-right: 10px;
            margin-bottom: 10px;
        }
        .branch-list, .checkpoint-list {
            margin-top: 15px;
        }
        .branch-item, .checkpoint-item {
            padding: 10px;
            margin: 5px 0;
            background: #f9f9f9;
            border-radius: 4px;
            border-left: 3px solid #2196F3;
        }
        .stats {
            background: #E3F2FD;
            padding: 15px;
            border-radius: 4px;
            margin-bottom: 15px;
        }
        .stats-item {
            margin: 5px 0;
            font-size: 14px;
        }
    </style>
</head>
<body>
    <h1>🌿 Context Branching Chat Demo</h1>

    <div class="container">
        <div class="chat-panel">
            <div class="current-branch">Current Branch: <span id="current-branch">main</span></div>

            <div class="messages" id="messages"></div>

            <div class="input-area">
                <input type="text" id="message-input" placeholder="Type a message..." />
                <button onclick="sendMessage()">Send</button>
            </div>

            <div class="control-panel">
                <h3>Branch Controls</h3>
                <input type="text" id="checkpoint-name" placeholder="Checkpoint name" />
                <button onclick="createCheckpoint()">Create Checkpoint</button>
                <br/>
                <input type="text" id="branch-name" placeholder="Branch name" />
                <button onclick="createBranch()">Create Branch</button>
            </div>
        </div>

        <div class="sidebar">
            <div class="stats" id="stats">
                <h3>Workspace Stats</h3>
                <div class="stats-item">Branches: <span id="stat-branches">1</span></div>
                <div class="stats-item">Checkpoints: <span id="stat-checkpoints">0</span></div>
                <div class="stats-item">Messages: <span id="stat-messages">0</span></div>
            </div>

            <h3>Branches</h3>
            <div class="branch-list" id="branches"></div>

            <h3>Checkpoints</h3>
            <div class="checkpoint-list" id="checkpoints"></div>
        </div>
    </div>

    <script>
        const sessionId = 'web_' + Date.now();

        // Initialize workspace
        fetch('/api/workspace/create', {
            method: 'POST',
            headers: {'Content-Type': 'application/json'},
            body: JSON.stringify({session_id: sessionId})
        });

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

            // Display user message immediately
            addMessageToUI('user', message);
            input.value = '';

            // Send to server and get LLM response
            fetch(`/api/workspace/${sessionId}/message`, {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({role: 'user', content: message, get_response: true})
            })
            .then(response => response.json())
            .then(data => {
                if (data.response) {
                    // Real LLM response
                    addMessageToUI('assistant', data.response);
                } else if (data.llm === false) {
                    // Demo mode fallback
                    const demoResponse = `[Demo Mode] Received: "${message.substring(0, 50)}..."\n(Set API key for real responses)`;
                    addMessageToUI('assistant', demoResponse);

                    fetch(`/api/workspace/${sessionId}/message`, {
                        method: 'POST',
                        headers: {'Content-Type': 'application/json'},
                        body: JSON.stringify({role: 'assistant', content: demoResponse})
                    });
                }
                updateUI();
            })
            .catch(error => {
                console.error('Error:', error);
                addMessageToUI('system', 'Error sending message');
            });
        }

        function addMessageToUI(role, content) {
            const messagesDiv = document.getElementById('messages');
            const messageDiv = document.createElement('div');
            messageDiv.className = `message ${role}-message`;
            messageDiv.innerHTML = `<strong>${role}:</strong> ${content}`;
            messagesDiv.appendChild(messageDiv);
            messagesDiv.scrollTop = messagesDiv.scrollHeight;
        }

        function createCheckpoint() {
            const name = document.getElementById('checkpoint-name').value.trim();
            if (!name) {
                alert('Please enter a checkpoint name');
                return;
            }

            fetch(`/api/workspace/${sessionId}/checkpoint`, {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({name: name})
            })
            .then(response => response.json())
            .then(data => {
                alert(`Checkpoint created: ${data.checkpoint_id.substring(0, 8)}...`);
                document.getElementById('checkpoint-name').value = '';
                updateUI();
            });
        }

        function createBranch() {
            const name = document.getElementById('branch-name').value.trim();
            if (!name) {
                alert('Please enter a branch name');
                return;
            }

            fetch(`/api/workspace/${sessionId}/branch`, {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({name: name})
            })
            .then(response => response.json())
            .then(data => {
                if (data.error) {
                    alert(data.error);
                } else {
                    document.getElementById('branch-name').value = '';
                    switchBranch(name);
                }
            });
        }

        function switchBranch(branchName) {
            fetch(`/api/workspace/${sessionId}/switch`, {
                method: 'POST',
                headers: {'Content-Type': 'application/json'},
                body: JSON.stringify({branch: branchName})
            })
            .then(response => response.json())
            .then(data => {
                document.getElementById('current-branch').textContent = branchName;
                updateUI();
            });
        }

        function updateUI() {
            // Update stats
            fetch(`/api/workspace/${sessionId}/stats`)
                .then(response => response.json())
                .then(stats => {
                    document.getElementById('stat-branches').textContent = stats.total_branches;
                    document.getElementById('stat-checkpoints').textContent = stats.total_checkpoints;
                    document.getElementById('stat-messages').textContent = stats.total_messages;
                });

            // Update branches list
            fetch(`/api/workspace/${sessionId}/branches`)
                .then(response => response.json())
                .then(branches => {
                    const branchesDiv = document.getElementById('branches');
                    branchesDiv.innerHTML = '';
                    branches.forEach(branch => {
                        const div = document.createElement('div');
                        div.className = 'branch-item';
                        div.innerHTML = `
                            <strong>${branch.name}</strong><br/>
                            Messages: ${branch.message_count}
                            <button class="branch-button" onclick="switchBranch('${branch.name}')">Switch</button>
                        `;
                        branchesDiv.appendChild(div);
                    });
                });

            // Update checkpoints list
            fetch(`/api/workspace/${sessionId}/checkpoints`)
                .then(response => response.json())
                .then(checkpoints => {
                    const checkpointsDiv = document.getElementById('checkpoints');
                    checkpointsDiv.innerHTML = '';
                    checkpoints.forEach(cp => {
                        const div = document.createElement('div');
                        div.className = 'checkpoint-item';
                        div.innerHTML = `
                            <strong>${cp.name}</strong><br/>
                            ID: ${cp.id}...<br/>
                            Messages: ${cp.message_count}
                        `;
                        checkpointsDiv.appendChild(div);
                    });
                });
        }

        // Allow Enter key to send message
        document.getElementById('message-input').addEventListener('keypress', function(e) {
            if (e.key === 'Enter') {
                sendMessage();
            }
        });

        // Update UI on load
        setTimeout(updateUI, 500);
    </script>
</body>
</html>
"""


@app.route('/')
def index():
    """Serve the main chat interface."""
    return render_template_string(HTML_TEMPLATE)


@app.route('/api/workspace/create', methods=['POST'])
def create_workspace():
    """Create a new workspace."""
    data = request.json
    session_id = data.get('session_id')
    if not session_id:
        return jsonify({"error": "session_id required"}), 400

    workspace = sdk.create_workspace(session_id)
    return jsonify({"session_id": session_id, "status": "created"})


@app.route('/api/workspace/<session_id>/message', methods=['POST'])
def add_message(session_id):
    """Add a message to the workspace."""
    data = request.json
    role = data.get('role', 'user')
    content = data.get('content', '')
    get_llm_response = data.get('get_response', False)

    try:
        workspace = sdk.load_workspace(session_id)

        if role == 'user' and get_llm_response and llm_client:
            # Get LLM response
            try:
                response = llm_client.chat_with_workspace(workspace, content)
                return jsonify({"status": "ok", "response": response, "llm": True})
            except Exception as e:
                # Fallback to manual mode if LLM fails
                workspace.add_message(Message(role=role, content=content))
                return jsonify({"status": "ok", "error": str(e), "llm": False})
        else:
            # Just add the message without LLM response
            workspace.add_message(Message(role=role, content=content))
            return jsonify({"status": "ok", "llm": LLM_AVAILABLE})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/messages', methods=['GET'])
def get_messages(session_id):
    """Get current context messages."""
    try:
        workspace = sdk.load_workspace(session_id)
        context = workspace.get_current_context()
        return jsonify({
            "messages": [
                {"role": msg.role, "content": msg.content}
                for msg in context
            ]
        })
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/checkpoint', methods=['POST'])
def create_checkpoint(session_id):
    """Create a checkpoint."""
    data = request.json
    name = data.get('name', 'checkpoint')

    try:
        workspace = sdk.load_workspace(session_id)
        checkpoint_id = workspace.create_checkpoint(name)
        return jsonify({"checkpoint_id": checkpoint_id})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/branch', methods=['POST'])
def create_branch(session_id):
    """Create a new branch."""
    data = request.json
    name = data.get('name')

    try:
        workspace = sdk.load_workspace(session_id)

        # Get most recent checkpoint
        checkpoints = workspace.list_checkpoints()
        if not checkpoints:
            return jsonify({"error": "No checkpoints available. Create a checkpoint first."}), 400

        checkpoint_id = checkpoints[-1]['full_id']
        workspace.create_branch(checkpoint_id, name)
        return jsonify({"status": "ok", "branch": name})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/switch', methods=['POST'])
def switch_branch(session_id):
    """Switch to a branch."""
    data = request.json
    branch = data.get('branch')

    try:
        workspace = sdk.load_workspace(session_id)
        workspace.switch_branch(branch)
        return jsonify({"status": "ok", "current_branch": branch})
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/branches', methods=['GET'])
def list_branches(session_id):
    """List all branches."""
    try:
        workspace = sdk.load_workspace(session_id)
        branches = workspace.list_branches()
        return jsonify(branches)
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/checkpoints', methods=['GET'])
def list_checkpoints(session_id):
    """List all checkpoints."""
    try:
        workspace = sdk.load_workspace(session_id)
        checkpoints = workspace.list_checkpoints()
        return jsonify(checkpoints)
    except Exception as e:
        return jsonify({"error": str(e)}), 400


@app.route('/api/workspace/<session_id>/stats', methods=['GET'])
def get_stats(session_id):
    """Get workspace statistics."""
    try:
        workspace = sdk.load_workspace(session_id)
        stats = workspace.get_statistics()
        return jsonify(stats)
    except Exception as e:
        return jsonify({"error": str(e)}), 400


def main():
    """Main entry point."""
    parser = argparse.ArgumentParser(description="Web Chat App with Context Branching")
    parser.add_argument(
        "--port",
        type=int,
        default=5050,
        help="Port to run server on (default: 5000)"
    )
    parser.add_argument(
        "--storage-path",
        default="./app_data",
        help="Storage path (default: ./app_data)"
    )
    parser.add_argument(
        "--debug",
        action="store_true",
        help="Run in debug mode"
    )

    args = parser.parse_args()

    # Initialize SDK globally
    global sdk
    sdk = ContextBranchingSDK(
        storage_backend="file",
        storage_path=args.storage_path
    )

    print(f"\n🌿 Context Branching Web Chat")
    print(f"=" * 50)
    print(f"Server running on http://localhost:{args.port}")
    print(f"Storage path: {args.storage_path}")
    print(f"=" * 50)
    print()

    app.run(host='0.0.0.0', port=args.port, debug=args.debug)


if __name__ == "__main__":
    main()