#!/usr/bin/env python3
"""找到真正的标题输入框"""
import socket, json, urllib.request, urllib.parse

HOST = 'localhost'
PORT = 9223
pages = json.loads(urllib.request.urlopen(f'http://{HOST}:{PORT}/json').read())
page_id = [p['id'] for p in pages if 'baijiahao.baidu.com' in p['url']][0]

ws_url = f'ws://{HOST}:{PORT}/devtools/page/{page_id}'
parsed = urllib.parse.urlparse(ws_url)
sock = socket.create_connection((parsed.hostname, parsed.port or 80), timeout=15)
key = 'dGhlIHNhbXBsZSBub25jZQ=='
handshake = f'GET {parsed.path} HTTP/1.1\r\nHost:{parsed.hostname}:{parsed.port}\r\nUpgrade:websocket\r\nConnection:Upgrade\r\nSec-WebSocket-Key:{key}\r\nSec-WebSocket-Version:13\r\n\r\n'
sock.send(handshake.encode())
resp = b''
while b'\r\n\r\n' not in resp:
    resp += sock.recv(4096)

def send(s, d):
    data = json.dumps(d).encode('utf-8')
    n = len(data)
    mask = b'\x01\x02\x03\x04'
    if n <= 125:
        hdr = bytes([0x81, n|0x80]) + mask
    elif n <= 65535:
        hdr = bytes([0x81, 0xFE]) + n.to_bytes(2, 'big') + mask
    s.send(hdr + bytes(data[i] ^ mask[i%4] for i in range(n)))

def recv(s):
    h = s.recv(2)
    n = h[1] & 0x7f
    if n == 126:
        n = int.from_bytes(s.recv(2), 'big')
    elif n == 127:
        n = int.from_bytes(s.recv(8), 'big')
    return s.recv(n).decode('utf-8')

# 查找所有输入框和计数器
expr = '''
(function(){
    var r = {counters: [], inputs: [], titleArea: null};
    
    // 找字数计数器
    var counters = document.querySelectorAll('[class*="count"], [class*="limit"]');
    for(var c of counters){
        r.counters.push({
            text: c.innerText,
            class: c.className,
            parent: c.parentElement ? c.parentElement.className : null
        });
    }
    
    // 找标题区域（在正文上方）
    var allDivs = document.querySelectorAll('div');
    for(var d of allDivs){
        var text = d.innerText.trim();
        if(text.length > 0 && text.length < 100 && d.getBoundingClientRect().top < 200){
            if(d.querySelector('input') || d.querySelector('[contenteditable]')){
                r.inputs.push({
                    tag: d.tagName,
                    class: d.className.substring(0,50),
                    top: Math.round(d.getBoundingClientRect().top),
                    text: text.substring(0,50)
                });
            }
        }
    }
    
    return JSON.stringify(r);
})()
'''
send(sock, {'id':1,'method':'Runtime.evaluate','params':{'expression':expr}})
r = recv(sock)
result = json.loads(r)['result']['result']['value']
print(json.dumps(json.loads(result), indent=2, ensure_ascii=False))

sock.close()
