import json
import base64
import time
import urllib.request
import subprocess
import os

def base64url_encode(data):
    return base64.urlsafe_b64encode(data).decode('utf-8').replace('=', '')

def get_access_token():
    with open('/home/openclaw/.openclaw/workspace/google_service_account.json') as f:
        creds = json.load(f)
    private_key_str = creds['private_key']
    client_email = creds['client_email']
    token_uri = creds['token_uri']
    header = {"alg": "RS256", "typ": "JWT"}
    header_b64 = base64url_encode(json.dumps(header).encode())
    now = int(time.time())
    payload = {
        "iss": client_email,
        "scope": "https://www.googleapis.com/auth/documents",
        "aud": token_uri,
        "iat": now,
        "exp": now + 3600
    }
    payload_b64 = base64url_encode(json.dumps(payload).encode())
    content = f"{header_b64}.{payload_b64}"
    key_file = '/tmp/priv_spacer.pem'
    with open(key_file, 'w') as f:
        f.write(private_key_str)
    try:
        process = subprocess.Popen(
            ['openssl', 'dgst', '-sha256', '-sign', key_file],
            stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE
        )
        signature, err = process.communicate(input=content.encode())
        if process.returncode != 0:
            raise Exception(f"OpenSSL error: {err.decode()}")
    finally:
        if os.path.exists(key_file):
            os.remove(key_file)
    signature_b64 = base64url_encode(signature)
    jwt = f"{content}.{signature_b64}"
    data = urllib.parse.urlencode({
        "grant_type": "urn:ietf:params:oauth:grant-type:jwt-bearer",
        "assertion": jwt
    }).encode()
    req = urllib.request.Request(token_uri, data=data)
    with urllib.request.urlopen(req) as f:
        res = json.loads(f.read().decode())
    return res['access_token']

def add_spacers():
    access_token = get_access_token()
    doc_id = "1Ymh60_Qe2yX6TgfznwOHwlphv8YMoz3SscJNg_HZtO0"
    
    get_uri = f"https://docs.googleapis.com/v1/documents/{doc_id}"
    req = urllib.request.Request(get_uri, headers={"Authorization": f"Bearer {access_token}"})
    with urllib.request.urlopen(req) as f:
        doc = json.loads(f.read().decode())
    
    content = doc.get('body', {}).get('content', [])
    requests = []
    
    # We process in reverse to keep indices stable
    for i in range(len(content) - 1, 0, -1):
        curr = content[i]
        prev = content[i-1]
        
        if 'paragraph' in curr and 'paragraph' in prev:
            curr_para = curr['paragraph']
            prev_para = prev['paragraph']
            
            # Check if they are empty (already a spacer)
            curr_text = "".join([el.get('textRun', {}).get('content', '') for el in curr_para.get('elements', [])]).strip()
            prev_text = "".join([el.get('textRun', {}).get('content', '') for el in prev_para.get('elements', [])]).strip()
            
            if curr_text == "" or prev_text == "":
                continue
            
            # Check if either is a list item (starts with *)
            if curr_text.startswith('*') or prev_text.startswith('*'):
                continue
                
            # If both are normal paragraphs and not empty, insert a newline between them
            # startIndex of curr is the location for insertion
            requests.append({
                "insertText": {
                    "location": {"index": curr['startIndex']},
                    "text": "\n"
                }
            })
            
    if not requests:
        print("No spaces needed.")
        return

    update_uri = f"https://docs.googleapis.com/v1/documents/{doc_id}:batchUpdate"
    req = urllib.request.Request(
        update_uri, 
        data=json.dumps({"requests": requests}).encode(),
        headers={
            "Authorization": f"Bearer {access_token}",
            "Content-Type": "application/json"
        },
        method='POST'
    )
    with urllib.request.urlopen(req) as f:
        final_res = json.loads(f.read().decode())
    print(f"Inserted {len(requests)} line breaks.")

if __name__ == "__main__":
    try:
        add_spacers()
    except Exception as e:
        print(f"Error: {e}")