import os
import json
import uuid
from flask import Flask, request, Response, jsonify, stream_with_context
from flask_limiter import Limiter
from flask_limiter.util import get_remote_address
import socketio
import requests
from requests.exceptions import RequestException

app = Flask(__name__)

# 从环境变量中获取配置
API_KEY = os.environ.get('PPLX_KEY')
PPLX_COOKIE = os.environ.get('PPLX_COOKIE')
USER_AGENT = os.environ.get('USER_AGENT')
PROXY = os.environ.get('PROXY')

# 设置限流
limiter = Limiter(
    get_remote_address,
    app=app,
    default_limits=["100 per 5 minutes"],
    storage_uri="memory://"
)

# Socket.IO 客户端设置
sio = socketio.Client()

# 代理设置
proxies = {'https': PROXY} if PROXY else None

@app.route('/')
def home():
    return jsonify({
        "message": "Welcome to the Perplexity AI Proxy API",
        "endpoints": {
            "/ai/v1/messages": {
                "method": "POST",
                "description": "Send a message to the AI",
                "headers": {
                    "x-api-key": "Your API key (required)",
                    "Content-Type": "application/json"
                },
                "body": {
                    "messages": "Array of message objects",
                    "stream": "Boolean (true for streaming response)",
                }
            }
        }
    })

@app.route('/health')
def health_check():
    return jsonify({"status": "OK"}), 200

def validate_api_key():
    api_key = request.headers.get('x-api-key')
    if api_key != API_KEY:
        return jsonify({"error": "Invalid API key"}), 401

@app.route('/ai/v1/messages', methods=['POST'])
@limiter.limit("100 per 15 minutes")
def ai_messages():
    auth_result = validate_api_key()
    if auth_result:
        return auth_result

    try:
        data = request.json
        if not data.get('stream', False):
            return jsonify({
                "id": str(uuid.uuid4()),
                "content": [
                    {"text": "Please turn on streaming."},
                    {"id": "string", "name": "string", "input": {}}
                ],
                "model": "string",
                "stop_reason": "end_turn",
                "stop_sequence": "string",
                "usage": {"input_tokens": 0, "output_tokens": 0}
            })

        def generate():
            previous_messages = "\n\n".join([msg['content'] for msg in data['messages']])
            msg_id = str(uuid.uuid4())

            yield create_event("message_start", {
                "type": "message_start",
                "message": {
                    "id": msg_id,
                    "type": "message",
                    "role": "assistant",
                    "content": [],
                    "model": "claude-3-opus-20240229",
                    "stop_reason": None,
                    "stop_sequence": None,
                    "usage": {"input_tokens": 8, "output_tokens": 1},
                },
            })
            yield create_event("content_block_start", {"type": "content_block_start", "index": 0, "content_block": {"type": "text", "text": ""}})
            yield create_event("ping", {"type": "ping"})

            try:
                sio.connect('wss://www.perplexity.ai', transports=['websocket'], 
                            headers={
                                'Cookie': PPLX_COOKIE,
                                'User-Agent': USER_AGENT
                            },
                            http_session=requests.Session() if PROXY else None,
                            proxies=proxies)
                sio.emit('perplexity_ask', previous_messages, {
                    "version": "2.9",
                    "source": "default",
                    "attachments": [],
                    "language": "en-GB",
                    "timezone": "Europe/London",
                    "search_focus": "writing",
                    "frontend_uuid": str(uuid.uuid4()),
                    "mode": "concise",
                    "is_related_query": False,
                    "is_default_related_query": False,
                    "visitor_id": str(uuid.uuid4()),
                    "frontend_context_uuid": str(uuid.uuid4()),
                    "prompt_source": "user",
                    "query_source": "home"
                })

                @sio.on('query_progress')
                def on_query_progress(data):
                    if data.get('text'):
                        text = json.loads(data['text'])
                        chunk = text['chunks'][-1] if text['chunks'] else None
                        if chunk:
                            yield create_event("content_block_delta", {
                                "type": "content_block_delta",
                                "index": 0,
                                "delta": {"type": "text_delta", "text": chunk},
                            })

                sio.wait()
                
            except Exception as e:
                print(f"Socket error: {e}")
                yield create_event("content_block_delta", {
                    "type": "content_block_delta",
                    "index": 0,
                    "delta": {"type": "text_delta", "text": "An error occurred while processing your request"},
                })
            finally:
                sio.disconnect()

            yield create_event("content_block_stop", {"type": "content_block_stop", "index": 0})
            yield create_event("message_delta", {
                "type": "message_delta",
                "delta": {"stop_reason": "end_turn", "stop_sequence": None},
                "usage": {"output_tokens": 12},
            })
            yield create_event("message_stop", {"type": "message_stop"})

        return Response(stream_with_context(generate()), content_type='text/event-stream')

    except Exception as e:
        print(f"Request error: {e}")
        return jsonify({"error": str(e)}), 400

def create_event(event, data):
    if isinstance(data, dict):
        data = json.dumps(data)
    return f"event: {event}\ndata: {data}\n\n"

@app.errorhandler(404)
def not_found(error):
    return jsonify({"error": "Not Found"}), 404

@app.errorhandler(500)
def server_error(error):
    return jsonify({"error": "Internal Server Error"}), 500

if __name__ == '__main__':
    port = int(os.environ.get('PORT', 8081))
    app.run(host='0.0.0.0', port=port)