import os
from dataclasses import dataclass
from typing import List


def _split_csv(value: str) -> List[str]:
    return [item.strip() for item in value.split(",") if item.strip()]


@dataclass(frozen=True)
class AppConfig:
    app_name: str
    database_path: str
    poll_interval_seconds: int
    scheduler_enabled: bool
    admin_token: str
    request_timeout_seconds: int

    proxmox_enabled: bool
    proxmox_endpoints: List[str]
    proxmox_token_id: str
    proxmox_token_secret: str
    proxmox_user: str
    proxmox_password: str
    proxmox_verify_tls: bool

    docker_enabled: bool
    docker_hosts: List[str]
    docker_bearer_token: str
    docker_agent_endpoints: List[str]
    docker_agent_token: str

    coolify_enabled: bool
    coolify_endpoints: List[str]
    coolify_api_token: str


def _bool_env(name: str, default: bool) -> bool:
    value = os.getenv(name)
    if value is None:
        return default
    return value.strip().lower() in {"1", "true", "yes", "on"}


def load_config() -> AppConfig:
    base_dir = os.getenv("BASE_DIR", os.getcwd())
    os.makedirs(base_dir, exist_ok=True)

    docker_hosts = _split_csv(os.getenv("DOCKER_HOSTS", ""))
    if not docker_hosts:
        single_docker_host = os.getenv("DOCKER_HOST", "").strip()
        if single_docker_host:
            docker_hosts = [single_docker_host]

    return AppConfig(
        app_name=os.getenv("APP_NAME", "Home Lab Inventory"),
        database_path=os.getenv("DATABASE_PATH", os.path.join(base_dir, "inventory.db")),
        poll_interval_seconds=int(os.getenv("POLL_INTERVAL_SECONDS", "300")),
        scheduler_enabled=_bool_env("SCHEDULER_ENABLED", True),
        admin_token=os.getenv("ADMIN_TOKEN", ""),
        request_timeout_seconds=int(os.getenv("REQUEST_TIMEOUT_SECONDS", "10")),
        proxmox_enabled=_bool_env("PROXMOX_ENABLED", True),
        proxmox_endpoints=_split_csv(os.getenv("PROXMOX_ENDPOINTS", "")),
        proxmox_token_id=os.getenv("PROXMOX_TOKEN_ID", ""),
        proxmox_token_secret=os.getenv("PROXMOX_TOKEN_SECRET", ""),
        proxmox_user=os.getenv("PROXMOX_USER", ""),
        proxmox_password=os.getenv("PROXMOX_PASSWORD", ""),
        proxmox_verify_tls=_bool_env("PROXMOX_VERIFY_TLS", False),
        docker_enabled=_bool_env("DOCKER_ENABLED", True),
        docker_hosts=docker_hosts,
        docker_bearer_token=os.getenv("DOCKER_BEARER_TOKEN", ""),
        docker_agent_endpoints=_split_csv(os.getenv("DOCKER_AGENT_ENDPOINTS", "")),
        docker_agent_token=os.getenv("DOCKER_AGENT_TOKEN", ""),
        coolify_enabled=_bool_env("COOLIFY_ENABLED", True),
        coolify_endpoints=_split_csv(os.getenv("COOLIFY_ENDPOINTS", "")),
        coolify_api_token=os.getenv("COOLIFY_API_TOKEN", ""),
    )