"""Global configuration handling for SmartTools.

Manages ~/.smarttools/config.yaml with registry settings, tokens, and preferences.
"""

import uuid
from dataclasses import dataclass, field
from pathlib import Path
from typing import Optional

import yaml


# Default configuration directory
CONFIG_DIR = Path.home() / ".smarttools"
CONFIG_FILE = CONFIG_DIR / "config.yaml"

# Default registry URL (canonical base path)
DEFAULT_REGISTRY_URL = "https://gitea.brrd.tech/api/v1"


@dataclass
class RegistryConfig:
    """Registry-related configuration."""
    url: str = DEFAULT_REGISTRY_URL
    token: Optional[str] = None

    def to_dict(self) -> dict:
        d = {"url": self.url}
        if self.token:
            d["token"] = self.token
        return d

    @classmethod
    def from_dict(cls, data: dict) -> "RegistryConfig":
        return cls(
            url=data.get("url", DEFAULT_REGISTRY_URL),
            token=data.get("token")
        )


@dataclass
class Config:
    """Global SmartTools configuration."""
    registry: RegistryConfig = field(default_factory=RegistryConfig)
    client_id: str = ""
    auto_fetch_from_registry: bool = True
    default_provider: Optional[str] = None

    def __post_init__(self):
        # Generate client_id if not set
        if not self.client_id:
            self.client_id = f"anon_{uuid.uuid4().hex[:16]}"

    def to_dict(self) -> dict:
        d = {
            "registry": self.registry.to_dict(),
            "client_id": self.client_id,
            "auto_fetch_from_registry": self.auto_fetch_from_registry,
        }
        if self.default_provider:
            d["default_provider"] = self.default_provider
        return d

    @classmethod
    def from_dict(cls, data: dict) -> "Config":
        registry_data = data.get("registry", {})
        return cls(
            registry=RegistryConfig.from_dict(registry_data),
            client_id=data.get("client_id", ""),
            auto_fetch_from_registry=data.get("auto_fetch_from_registry", True),
            default_provider=data.get("default_provider")
        )


def get_config_dir() -> Path:
    """Get the config directory, creating it if needed."""
    CONFIG_DIR.mkdir(parents=True, exist_ok=True)
    return CONFIG_DIR


def load_config() -> Config:
    """Load configuration from disk, creating defaults if needed."""
    config_path = get_config_dir() / "config.yaml"

    if not config_path.exists():
        # Create default config
        config = Config()
        save_config(config)
        return config

    try:
        data = yaml.safe_load(config_path.read_text()) or {}
        return Config.from_dict(data)
    except Exception as e:
        print(f"Warning: Error loading config, using defaults: {e}")
        return Config()


def save_config(config: Config) -> Path:
    """Save configuration to disk."""
    config_path = get_config_dir() / "config.yaml"
    config_path.write_text(yaml.dump(config.to_dict(), default_flow_style=False, sort_keys=False))
    return config_path


def get_registry_url() -> str:
    """Get the configured registry URL."""
    config = load_config()
    return config.registry.url


def get_registry_token() -> Optional[str]:
    """Get the configured registry token."""
    config = load_config()
    return config.registry.token


def set_registry_token(token: str) -> None:
    """Set and save the registry token."""
    config = load_config()
    config.registry.token = token
    save_config(config)


def get_client_id() -> str:
    """Get the client ID for anonymous usage tracking."""
    config = load_config()
    return config.client_id


def is_auto_fetch_enabled() -> bool:
    """Check if auto-fetch from registry is enabled."""
    config = load_config()
    return config.auto_fetch_from_registry