import json
import logging
import os
import re
import socket
import yaml

log_path = 'logs/builder_logs.log'

log_dir = os.path.dirname(log_path)

if not os.path.exists(log_dir):
    os.makedirs(log_dir)

logging.basicConfig(
    level=logging.NOTSET,  # Minimum severity level to log
    # Log message format
    format='%(asctime)s - %(name)s - %(levelname)s - %(message)s',
    handlers=[
        logging.FileHandler(log_path),  # Log to a file
        logging.StreamHandler()  # Also display in the console
    ]
)


class api_schema_translator:

    REQUIRED_COMPONENTS = ["openapi", "info", "servers", "paths", "components"]

    def __init__(self, api_path):
        self.api_path = os.path.abspath(api_path)
        self.logger = logging.getLogger(self.__class__.__name__)
        self.logger.setLevel(logging.DEBUG)
        self.api_info = self.__load_api_file(self.api_path)
        self.__validate_api_info()

    def __validate_ip_port(self, ip, port):
        """Validates if an IP address and port are correctly formatted."""
        try:
            socket.inet_aton(ip)  # Validate IPv4
            return isinstance(port, int) and 0 < port < 65536
        except socket.error:
            return False

    def __parse_url(self, url):
        """
        Parses the URL to extract apiRoot, apiName, and apiVersion.
        Handles:
        - URLs with or without ports.
        - API root as an IP, FQDN, or preconfigured prefix.
        - Assigns default ports for HTTP (80) and HTTPS (443) if missing.
        """

        pattern = r"^(https?:\/\/)?([\w\.-]+|\[.*\])(?::(\d+))?(\/[\w\/-]+)?\/([\w-]+)\/(v\d+)$"
        match = re.match(pattern, url)

        if not match:
            self.logger.error(f"Invalid URL format: {url}")
            return None, None, None, None, None, None, None

        scheme, host, port, api_root, api_name, api_version = match.groups()

        # Asignar puerto por defecto si no está presente
        if not port:
            port = 443 if scheme == "https" else 80  # Si no hay esquema, asumimos HTTPS
        else:
            port = int(port)

        if not api_name or not api_version:
            self.logger.error(f"URL must contain API name and version in the format: <apiRoot>/<apiName>/v<version>")
            return None, None, None, None, None, None, None

        # Si apiRoot está presente, eliminar "/" innecesarios
        api_root = api_root.strip('/') if api_root else None

        if re.match(r"^\d{1,3}(\.\d{1,3}){3}$", host):  # IPv4
            return host, port, None, None, api_root, api_name, api_version
        elif re.match(r"^\[.*\]$", host):  # IPv6 (brackets format)
            return None, port, None, host.strip("[]"), api_root, api_name, api_version
        else:  # FQDN
            return None, port, host, None, api_root, api_name, api_version

    def build(self, url, supported_features, api_supp_features):
        """
        Builds the API description and saves it to a JSON file.
        Extracts apiRoot, apiName, and apiVersion.
        Supports IP, FQDN, and URLs with or without explicit ports.
        """
        # Validación de campos requeridos
        if not supported_features or not api_supp_features:
            self.logger.error("Both 'supported_features' and 'api_supp_features' are required. Aborting build.")
            return

        # Parseamos la URL
        ip, port, fqdn, ipv6Addr, api_root, api_name, api_version = self.__parse_url(url)

        # Validamos que al menos una dirección sea válida
        if not (ip or fqdn or ipv6Addr or api_root):
            self.logger.error("Invalid URL: No valid IP, IPv6, FQDN, or API root found. Aborting build.")
            return

        # Validamos IP y puerto si es IPv4
        if ip and not self.__validate_ip_port(ip, port):
            self.logger.error("Invalid IP or port. Aborting build.")
            return

        # Construcción de la API
        try:
            api_data = {
                "apiName": api_name,
                "aefProfiles": self.__build_aef_profiles(ip, port, api_version, fqdn, ipv6Addr),
                "description": self.api_info["info"].get("description", "No description provided"),
                "supportedFeatures": supported_features,
                "shareableInfo": {
                    "isShareable": True,
                    "capifProvDoms": ["string"]
                },
                "serviceAPICategory": "string",
                "apiSuppFeats": api_supp_features,
                "pubApiPath": {
                    "ccfIds": ["string"]
                },
                "ccfId": "string"
            }

            # Guardamos los datos en un archivo JSON
            with open(f"{api_name}.json", "w") as outfile:
                json.dump(api_data, outfile, indent=4)
            self.logger.info(f"API description saved to {api_name}.json")

        except Exception as e:
            self.logger.error(f"An error occurred during the build process: {e}")

    def __load_api_file(self, api_file: str):
        """Loads the Swagger API configuration file and converts YAML to JSON format if necessary."""
        try:
            with open(api_file, 'r') as file:
                if api_file.endswith('.yaml') or api_file.endswith('.yml'):
                    yaml_content = yaml.safe_load(file)
                    return json.loads(json.dumps(yaml_content))  # Convert YAML to JSON format
                elif api_file.endswith('.json'):
                    return json.load(file)
                else:
                    self.logger.warning(
                        f"Unsupported file extension for {api_file}. Only .yaml, .yml, and .json are supported.")
                    return {}
        except FileNotFoundError:
            self.logger.warning(
                f"Configuration file {api_file} not found. Using defaults or environment variables.")
            return {}
        except (json.JSONDecodeError, yaml.YAMLError) as e:
            self.logger.error(
                f"Error parsing the configuration file {api_file}: {e}")
            return {}

    def __validate_api_info(self):
        """Validates that all required components are present in the API specification."""
        missing_components = [comp for comp in self.REQUIRED_COMPONENTS if comp not in self.api_info]
        if missing_components:
            self.logger.warning(f"Missing components in API specification: {', '.join(missing_components)}")
        else:
            self.logger.info("All required components are present in the API specification.")

    def __build_aef_profiles(self, ip, port, api_version, fqdn=None, ipv6Addr=None, ):
        """Builds the aefProfiles section based on the paths and components in the API info."""
        aef_profiles = []

        resources = []
        for path, methods in self.api_info.get("paths", {}).items():
            for method, details in methods.items():
                resource = {
                    "resourceName": details.get("summary", "Unnamed Resource"),
                    "commType": "REQUEST_RESPONSE",
                    "uri": path,
                    "custOpName": f"http_{method}",
                    "operations": [method.upper()],
                    "description": details.get("description", "")
                }
                resources.append(resource)

        # Create interface description based on the standard
        interface_description = {
            "port": port,
            "securityMethods": ["OAUTH"]
        }
        # Include ipv4Addr, ipv6Addr, or fqdn as per the standard
        if ip:
            interface_description["ipv4Addr"] = ip
        elif ipv6Addr:
            interface_description["ipv6Addr"] = ipv6Addr
        elif fqdn:
            interface_description["fqdn"] = fqdn
        else:
            raise ValueError("At least one of ipv4Addr, ipv6Addr, or fqdn must be provided.")

        # Example profile creation based on paths, customize as needed
        aef_profile = {
            "aefId": "",  # Placeholder AEF ID
            "versions": [
                {
                    "apiVersion": f"{api_version}",
                    "expiry": "2100-11-30T10:32:02.004Z",
                    "resources": resources,
                    "custOperations": [
                        {
                            "commType": "REQUEST_RESPONSE",
                            "custOpName": "string",
                            "operations": ["POST"],
                            "description": "string"
                        },
                        {
                            "commType": "REQUEST_RESPONSE",
                            "custOpName": "check-authentication",
                            "operations": [
                                "POST"
                            ],
                            "description": "Check authentication request."
                        },
                        {
                            "commType": "REQUEST_RESPONSE",
                            "custOpName": "revoke-authentication",
                            "operations": [
                                "POST"
                            ],
                            "description": "Revoke authorization for service APIs."
                        }
                    ]
                }
            ],
            "protocol": "HTTP_1_1",
            "dataFormat": "JSON",
            "securityMethods": ["OAUTH"],
            "interfaceDescriptions": [interface_description]
        }
        aef_profiles.append(aef_profile)
        return aef_profiles

    def __validate_ip_port(self, ip, port):
        """Validates that the IP and port have the correct format."""
        ip_pattern = re.compile(r"^(?:[0-9]{1,3}\.){3}[0-9]{1,3}$")

        # Validate IP
        if not ip_pattern.match(ip):
            self.logger.warning(f"Invalid IP format: {ip}. Expected IPv4 format.")
            return False

        # Validate each octet in the IP address
        if any(int(octet) > 255 or int(octet) < 0 for octet in ip.split(".")):
            self.logger.warning(f"IP address out of range: {ip}. Each octet should be between 0 and 255.")
            return False

        # Validate Port
        if not (1 <= port <= 65535):
            self.logger.warning(f"Invalid port number: {port}. Port should be between 1 and 65535.")
            return False

        self.logger.info("IP and port have correct format.")
        return True