"""
Route53 DNS record updater.
"""

import logging
import os
from typing import TYPE_CHECKING

import boto3
from dotenv import load_dotenv

try:
    from mypy_boto3_route53 import Route53Client
except ImportError:
    Route53Client = object  # type: ignore

load_dotenv()

log_level = os.getenv("LOG_LEVEL", "INFO").upper()

logging.basicConfig(
    level=log_level,
    format="%(asctime)s.%(msecs)03d %(levelname)s %(module)s - %(funcName)s: %(message)s",
    datefmt="%Y-%m-%d %H:%M:%S",
)
logger = logging.getLogger(__name__)


def _get_route53_client() -> Route53Client:
    access_key = os.getenv("AWS_ACCESS_KEY_ID")
    secret_key = os.getenv("AWS_SECRET_ACCESS_KEY")
    if access_key and secret_key:
        return boto3.client(
            "route53",
            aws_access_key_id=access_key,
            aws_secret_access_key=secret_key,
        )
    return boto3.client("route53")


def _get_current_record(hosted_zone_id: str, record: str, record_type: str) -> str | None:
    client = _get_route53_client()
    try:
        response = client.list_resource_record_sets(HostedZoneId=hosted_zone_id)
        record_normalized = record.rstrip(".")
        for rrset in response["ResourceRecordSets"]:
            if rrset["Name"].rstrip(".") == record_normalized and rrset["Type"] == record_type:
                records = rrset.get("ResourceRecords", [])
                if records:
                    value = records[0]["Value"].rstrip(".")
                    logger.debug("Found %s record %s: value='%s' (len=%d)", record_type, record, value, len(value))
                    return value
    except Exception as e:
        logger.warning("Failed to get current %s record for %s: %s", record_type, record, e)
    logger.debug("No %s record found for %s", record_type, record)
    return None


def update_ipv4(hosted_zone_id: str, record: str, public_ipv4: str) -> bool:
    current = _get_current_record(hosted_zone_id, record, "A")
    logger.debug("IPv4 comparison for %s: current='%s' (len=%d) vs desired='%s' (len=%d)", record, current, len(current or ""), public_ipv4, len(public_ipv4))
    if current == public_ipv4:
        logger.info("IPv4 for %s is already %s, no update needed", record, public_ipv4)
        return False
    logger.debug("Creating Route53 client for hosted zone %s", hosted_zone_id)
    client: Route53Client = _get_route53_client()
    logger.debug("Building ChangeBatch for IPv4: record=%s, ip=%s, ttl=300", record, public_ipv4)
    try:
        logger.info("Calling Route53 upsert for IPv4 on %s", record)
        client.change_resource_record_sets(
            HostedZoneId=hosted_zone_id,
            ChangeBatch={
                "Comment": "Update Public Addresses",
                "Changes": [
                    {
                        "Action": "UPSERT",
                        "ResourceRecordSet": {
                            "Name": f"{record}",
                            "Type": "A",
                            "TTL": 300,
                            "ResourceRecords": [{"Value": public_ipv4}],
                        },
                    }
                ],
            },
        )
        logger.info("Successfully updated IPv4 for %s -> %s", record, public_ipv4)
        return True
    except Exception as e:
        logger.error("Error updating IPv4 for %s: %s", record, e)
        raise e


def update_ipv6(hosted_zone_id: str, record: str, public_ipv6: str) -> bool:
    current = _get_current_record(hosted_zone_id, record, "AAAA")
    logger.debug("IPv6 comparison for %s: current='%s' (len=%d) vs desired='%s' (len=%d)", record, current, len(current or ""), public_ipv6, len(public_ipv6))
    if current == public_ipv6:
        logger.info("IPv6 for %s is already %s, no update needed", record, public_ipv6)
        return False
    logger.debug("Creating Route53 client for hosted zone %s", hosted_zone_id)
    client = _get_route53_client()
    logger.debug("Building ChangeBatch for IPv6: record=%s, ip=%s, ttl=300", record, public_ipv6)
    try:
        logger.info("Calling Route53 upsert for IPv6 on %s", record)
        client.change_resource_record_sets(
            HostedZoneId=hosted_zone_id,
            ChangeBatch={
                "Comment": "Update Public Addresses",
                "Changes": [
                    {
                        "Action": "UPSERT",
                        "ResourceRecordSet": {
                            "Name": f"{record}",
                            "Type": "AAAA",
                            "TTL": 300,
                            "ResourceRecords": [{"Value": public_ipv6}],
                        },
                    }
                ],
            },
        )
        logger.info("Successfully updated IPv6 for %s -> %s", record, public_ipv6)
        return True
    except Exception as e:
        logger.error("Error updating IPv6 for %s: %s", record, e)
        raise e