from __future__ import annotations

import os
from dataclasses import dataclass
from pathlib import Path


def _load_env_file(path: Path) -> None:
    if not path.exists():
        return

    for raw_line in path.read_text(encoding="utf-8").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#"):
            continue
        if line.startswith("export "):
            line = line[len("export ") :].lstrip()
        if "=" not in line:
            continue
        key, value = line.split("=", 1)
        key = key.strip()
        value = value.strip()
        if not key or key in os.environ:
            continue
        if len(value) >= 2 and value[0] == value[-1] and value[0] in {'"', "'"}:
            value = value[1:-1]
        os.environ[key] = value


@dataclass(frozen=True)
class AppSettings:
    config_path: Path
    cache_dir: Path
    refresh_interval_seconds: int
    host: str
    port: int

    @classmethod
    def from_env(cls) -> "AppSettings":
        project_root = Path(__file__).resolve().parents[1]
        _load_env_file(project_root / ".env")
        return cls(
            config_path=Path(
                os.environ.get("OPENCLAW_CONFIG_PATH", "/home/lucky/.openclaw/openclaw.json")
            ),
            cache_dir=Path(os.environ.get("MODEL_SELECTOR_CACHE_DIR", "data/model-cache")),
            refresh_interval_seconds=int(os.environ.get("MODEL_SELECTOR_REFRESH_INTERVAL", "1800")),
            host=os.environ.get("MODEL_SELECTOR_HOST", "0.0.0.0"),
            port=int(os.environ.get("MODEL_SELECTOR_PORT", "3300")),
        )