import json
import os
import time
import requests

class RSCAuth:
    def __init__(self, config_file='rsc.json'):
        self.config_file = config_file
        self.load_config()
        self.token = None
        self.token_expiration = None

    def load_config(self):
        if not os.path.exists(self.config_file):
            raise FileNotFoundError(f"Configuration file {self.config_file} not found")
        
        with open(self.config_file, 'r') as f:
            config = json.load(f)
        
        self.client_id = config.get('client_id')
        self.client_secret = config.get('client_secret')
        self.access_token_uri = config.get('access_token_uri')
        
        if not all([self.client_id, self.client_secret, self.access_token_uri]):
            raise ValueError("Missing required fields in config: client_id, client_secret, access_token_uri")
        
        # Derive host from access_token_uri
        self.host = self.access_token_uri.replace('https://', '').replace('/api/client_token', '')

    def get_token(self):
        # Check if we have a cached token
        cache_file = self._get_cache_file()
        if os.path.exists(cache_file):
            with open(cache_file, 'r') as f:
                expiration, token = f.read().strip().split(' ', 1)
                expiration = int(expiration)
                if time.time() < expiration - 1800:  # Refresh 30 min before expiry
                    self.token = token
                    self.token_expiration = expiration
                    return token
        
        # Get new token
        return self._fetch_token()

    def _fetch_token(self):
        payload = {
            'client_id': self.client_id,
            'client_secret': self.client_secret
        }
        headers = {'accept': 'application/json', 'Content-Type': 'application/json'}
        
        response = requests.post(self.access_token_uri, json=payload, headers=headers)
        response.raise_for_status()
        
        data = response.json()
        self.token = data['access_token']
        expires_in = data['expires_in']
        self.token_expiration = int(time.time()) + expires_in
        
        # Cache the token
        cache_file = self._get_cache_file()
        os.makedirs(os.path.dirname(cache_file), exist_ok=True)
        with open(cache_file, 'w') as f:
            f.write(f"{self.token_expiration} {self.token}")
        os.chmod(cache_file, 0o600)
        
        return self.token

    def _get_cache_file(self):
        # Use the id part after 'client|'
        if '|' in self.client_id:
            id_part = self.client_id.split('|')[1]
        else:
            id_part = self.client_id
        return os.path.expanduser(f"~/.rbkRscsession.{id_part}")

    def get_headers(self):
        return {
            'Authorization': f'Bearer {self.get_token()}',
            'Content-Type': 'application/json'
        }

class RSCGraphQL:
    def __init__(self, auth):
        self.auth = auth
        self.endpoint = f"https://{self.auth.host}/api/graphql"

    def query(self, query, variables=None):
        payload = {'query': query}
        if variables:
            payload['variables'] = variables
        
        headers = self.auth.get_headers()
        response = requests.post(self.endpoint, json=payload, headers=headers)
        response.raise_for_status()
        
        data = response.json()
        
        # Check for GraphQL errors
        if 'errors' in data:
            raise Exception(f"GraphQL errors: {data['errors']}")
        
        return data

    def introspect_schema(self):
        """Introspect the GraphQL schema to get type information"""
        introspection_query = """
        query IntrospectionQuery {
          __schema {
            types {
              name
              kind
              description
              fields(includeDeprecated: true) {
                name
                description
                type {
                  name
                  kind
                  ofType {
                    name
                    kind
                  }
                }
                args {
                  name
                  description
                  type {
                    name
                    kind
                    ofType {
                      name
                      kind
                    }
                  }
                }
              }
            }
          }
        }
        """
        return self.query(introspection_query)

    def get_type_info(self, type_name):
        """Get detailed information about a specific GraphQL type"""
        query = """
        query GetTypeInfo($typeName: String!) {
          __type(name: $typeName) {
            name
            kind
            description
            fields(includeDeprecated: true) {
              name
              description
              type {
                name
                kind
                ofType {
                  name
                  kind
                  ofType {
                    name
                    kind
                  }
                }
              }
              args {
                name
                description
                type {
                  name
                  kind
                  ofType {
                    name
                    kind
                    ofType {
                      name
                      kind
                    }
                  }
                }
              }
            }
          }
        }
        """
        return self.query(query, {"typeName": type_name})