import requests
from urllib.parse import urlencode, urlparse


client_id = ''
client_secret = ''
instance = ''
tenant_id = ''  
redirect_uri = ''

tenant_url = 'https://{instance}.api.crm4.dynamics.com'  # 👈 Replace this with your actual instance
redirect_uri = ''
auth_url = 'https://login.microsoftonline.com/common/oauth2/authorize'
token_url = f'https://login.microsoftonline.com/{tenant_id}/oauth2/token'


def get_authorization_code():
    
    params = {
        'client_id': client_id,
        'response_type': 'code',
        'redirect_uri': redirect_uri,
        'resource': tenant_url,
        'state': 'xyz123'
    }

    authorization_url = auth_url + '?' + urlencode(params)

    print("\n Open the following URL in your browser and authenticate:")
    print(authorization_url)
    print("\n After login, paste the full redirected URL here:")

    redirected_url = input("Redirected URL: ").strip()
    parsed = urlparse(redirected_url)
    query_params = dict(param.split('=') for param in parsed.query.split('&') if '=' in param)
    code = query_params.get('code')

    if not code:
        print("Authorization code not found. Double-check the URL.")
        return None
    return code


def exchange_code_for_tokens(auth_code):
    
    data = {
        'grant_type': 'authorization_code',
        'client_id': client_id,
        'client_secret': client_secret,
        'redirect_uri': redirect_uri,
        'code': auth_code,
        'resource': tenant_url
    }

    response = requests.post(token_url, data=data)
    if response.status_code == 200:
        tokens = response.json()
        return tokens.get('access_token'), tokens.get('refresh_token')
    else:
        print("Token exchange failed:", response.text)
        return None, None


def save_tokens(auth_code, access_token, refresh_token):
    """Save tokens to a local file and copy the path and paste it below.Provided the sample"""
    path = "C:\\Users\\xyz\\new folder\\Desktop\\dynamics365_tokens.txt"
    with open(path, "w") as f:
        f.write(f"Authorization Code:\n{auth_code}\n\n")
        f.write(f"Access Token:\n{access_token}\n\n")
        f.write(f"Refresh Token:\n{refresh_token}\n\n")
    print(f"✅ Tokens saved to: {path}")


if __name__ == "__main__":
    code = get_authorization_code()
    if code:
        access_token, refresh_token = exchange_code_for_tokens(code)
        if access_token:
            save_tokens(code, access_token, refresh_token)
        else:
            print(" Failed to retrieve tokens.")