"""Host client configuration loader.

Loads host_config.yaml which contains:
- NODE_ID, DISPLAY_NAME
- ROUTER_URL, ROUTER_SECRET
- LLM config (OPENAI_*)
- WORKING_DIR, METASO_API_KEY
- SERVES_USERS list
"""

from __future__ import annotations

import os
from pathlib import Path
from typing import List, Optional

import yaml


class HostConfig:
    """Configuration for a host client node."""

    def __init__(self, config_path: Optional[Path] = None):
        config_path = config_path or Path(__file__).parent.parent / "host_config.yaml"
        self._load(config_path)

    def _load(self, config_path: Path) -> None:
        if not config_path.exists():
            raise FileNotFoundError(f"Config file not found: {config_path}")

        with open(config_path, "r", encoding="utf-8") as f:
            data = yaml.safe_load(f) or {}

        self.node_id: str = data.get("NODE_ID", "unknown-node")
        self.display_name: str = data.get("DISPLAY_NAME", self.node_id)
        self.router_url: str = data.get("ROUTER_URL", "ws://127.0.0.1:8000/ws/node")
        self.router_secret: str = data.get("ROUTER_SECRET", "")

        self.openai_base_url: str = data.get(
            "OPENAI_BASE_URL", "https://open.bigmodel.cn/api/paas/v4/"
        )
        self.openai_api_key: str = data.get("OPENAI_API_KEY", "")
        self.openai_model: str = data.get("OPENAI_MODEL", "glm-4.7")

        self.working_dir: str = data.get("WORKING_DIR", str(Path.home() / "projects"))
        self.metaso_api_key: Optional[str] = data.get("METASO_API_KEY")

        serves_users = data.get("SERVES_USERS", [])
        self.serves_users: list[str] = serves_users if isinstance(serves_users, list) else []

        self.capabilities: list[str] = data.get(
            "CAPABILITIES",
            ["claude_code", "shell", "file_ops", "web", "scheduler"],
        )

    @classmethod
    def from_keyring(cls, keyring_path: Optional[Path] = None) -> "HostConfig":
        """Create config from keyring.yaml (for standalone mode)."""
        keyring_path = keyring_path or Path(__file__).parent.parent / "keyring.yaml"
        if not keyring_path.exists():
            raise FileNotFoundError(f"keyring.yaml not found: {keyring_path}")

        with open(keyring_path, "r", encoding="utf-8") as f:
            data = yaml.safe_load(f) or {}

        config = cls.__new__(cls)
        config.node_id = data.get("NODE_ID", "local-node")
        config.display_name = data.get("DISPLAY_NAME", "Local Machine")
        config.router_url = data.get("ROUTER_URL", "ws://127.0.0.1:8000/ws/node")
        config.router_secret = data.get("ROUTER_SECRET", "")

        config.openai_base_url = data.get(
            "OPENAI_BASE_URL", "https://open.bigmodel.cn/api/paas/v4/"
        )
        config.openai_api_key = data.get("OPENAI_API_KEY", "")
        config.openai_model = data.get("OPENAI_MODEL", "glm-4.7")

        config.working_dir = data.get("WORKING_DIR", str(Path.home() / "projects"))
        config.metaso_api_key = data.get("METASO_API_KEY")

        serves_users = data.get("ALLOWED_OPEN_IDS", [])
        config.serves_users = serves_users if isinstance(serves_users, list) else []

        config.capabilities = ["claude_code", "shell", "file_ops", "web", "scheduler"]

        return config


host_config: Optional[HostConfig] = None


def get_host_config() -> HostConfig:
    """Get the global host config instance."""
    global host_config
    if host_config is None:
        host_config = HostConfig()
    return host_config