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

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.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 format_all_caps_to_h2():
    access_token = get_access_token()
    doc_id = "1Ymh60_Qe2yX6TgfznwOHwlphv8YMoz3SscJNg_HZtO0"
    
    # Get document content
    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())
    
    requests = []
    content = doc.get('body', {}).get('content', [])
    
    for element in content:
        if 'paragraph' in element:
            paragraph = element['paragraph']
            # Check if paragraph has text and style
            elements = paragraph.get('elements', [])
            full_text = ""
            for el in elements:
                if 'textRun' in el:
                    full_text += el['textRun']['content']
            
            # Remove trailing whitespace/newline for check
            clean_text = full_text.strip()
            
            # Logic: Length > 1 and all characters are uppercase letters (ignoring numbers/punctuation)
            # but must contain at least some letters.
            if len(clean_text) > 1 and clean_text.isupper():
                start_index = element['startIndex']
                end_index = element['endIndex']
                
                requests.append({
                    "updateParagraphStyle": {
                        "range": {
                            "startIndex": start_index,
                            "endIndex": end_index
                        },
                        "paragraphStyle": {
                            "namedStyleType": "HEADING_2"
                        },
                        "fields": "namedStyleType"
                    }
                })
    
    if not requests:
        print("No ALL CAPS paragraphs found.")
        return

    # Batch Update
    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"Updated {len(requests)} paragraphs to Heading 2.")

if __name__ == "__main__":
    try:
        format_all_caps_to_h2()
    except Exception as e:
        print(f"Error: {e}")