import os
import re
import socket


def _int(name, default):
    raw = os.environ.get(name)
    if raw is None or raw.strip() == "":
        return default
    try:
        return int(raw)
    except ValueError:
        return default


def _float(name, default):
    raw = os.environ.get(name)
    if raw is None or raw.strip() == "":
        return default
    try:
        return float(raw)
    except ValueError:
        return default


def _list(name, default):
    raw = os.environ.get(name, default)
    return [item.strip() for item in raw.split(",") if item.strip()]


def _slug(value):
    return re.sub(r"[^a-z0-9_-]+", "_", value.lower()).strip("_") or "device"


class Config:
    def __init__(self):
        env = os.environ
        hostname = socket.gethostname()

        self.port = _int("PORT", 9999)
        self.log_level = env.get("LOG_LEVEL", "INFO")
        self.db_path = env.get("DB_PATH", "/data/healthcheck.db")
        self.sample_retention_days = _int("SAMPLE_RETENTION_DAYS", 7)

        self.device_name = env.get("DEVICE_NAME", hostname)
        self.device_id = _slug(env.get("DEVICE_ID", self.device_name))

        self.reach_targets = _list("REACH_TARGETS", "1.1.1.1:443,8.8.8.8:443,9.9.9.9:443")
        self.reach_interval = _int("REACH_INTERVAL", 30)
        self.reach_timeout = _float("REACH_TIMEOUT", 3.0)

        self.dns_name = env.get("DNS_NAME", "cloudflare.com")
        self.dns_interval = _int("DNS_INTERVAL", 60)

        self.public_ip_urls = _list(
            "PUBLIC_IP_URLS",
            "https://api.ipify.org,https://ifconfig.me/ip,https://icanhazip.com",
        )
        self.public_ip_interval = _int("PUBLIC_IP_INTERVAL", 300)
        self.public_ip_timeout = _float("PUBLIC_IP_TIMEOUT", 5.0)

        self.uptime_interval = _int("UPTIME_INTERVAL", 60)

        self.wifi_interface = env.get("WIFI_INTERFACE", "").strip()
        self.wifi_link_interval = _int("WIFI_LINK_INTERVAL", 30)
        self.wifi_scan_interval = _int("WIFI_SCAN_INTERVAL", 60)

        self.mqtt_host = env.get("MQTT_HOST", "").strip()
        self.mqtt_port = _int("MQTT_PORT", 1883)
        self.mqtt_username = env.get("MQTT_USERNAME", "")
        self.mqtt_password = env.get("MQTT_PASSWORD", "")
        self.mqtt_discovery_prefix = env.get("MQTT_DISCOVERY_PREFIX", "homeassistant")

    def public(self):
        return {
            "device_name": self.device_name,
            "device_id": self.device_id,
            "reach_targets": self.reach_targets,
            "reach_interval": self.reach_interval,
            "dns_name": self.dns_name,
            "dns_interval": self.dns_interval,
            "public_ip_interval": self.public_ip_interval,
            "wifi_interface": self.wifi_interface,
            "wifi_link_interval": self.wifi_link_interval,
            "wifi_scan_interval": self.wifi_scan_interval,
            "sample_retention_days": self.sample_retention_days,
            "mqtt_enabled": bool(self.mqtt_host),
        }