import os
from typing import Optional

from dotenv import load_dotenv


load_dotenv(dotenv_path=".env", override=False)


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


def _parse_allowed_region() -> Optional[tuple[int, int, int, int]]:
    raw = os.getenv("CLICKTHROUGH_ALLOWED_REGION")
    if not raw:
        return None
    parts = [p.strip() for p in raw.split(",")]
    if len(parts) != 4:
        raise ValueError("CLICKTHROUGH_ALLOWED_REGION must be x,y,width,height")
    x, y, w, h = (int(p) for p in parts)
    if w <= 0 or h <= 0:
        raise ValueError("CLICKTHROUGH_ALLOWED_REGION width/height must be > 0")
    return x, y, w, h


SETTINGS = {
    "host": os.getenv("CLICKTHROUGH_HOST", "127.0.0.1"),
    "port": int(os.getenv("CLICKTHROUGH_PORT", "8123")),
    "token": os.getenv("CLICKTHROUGH_TOKEN", "").strip(),
    "dry_run": _env_bool("CLICKTHROUGH_DRY_RUN", False),
    "allowed_region": _parse_allowed_region(),
    "exec_enabled": _env_bool("CLICKTHROUGH_EXEC_ENABLED", True),
    "exec_default_shell": os.getenv("CLICKTHROUGH_EXEC_DEFAULT_SHELL", "powershell").strip().lower(),
    "exec_default_timeout_s": int(os.getenv("CLICKTHROUGH_EXEC_TIMEOUT_S", "30")),
    "exec_max_timeout_s": int(os.getenv("CLICKTHROUGH_EXEC_MAX_TIMEOUT_S", "120")),
    "exec_max_output_chars": int(os.getenv("CLICKTHROUGH_EXEC_MAX_OUTPUT_CHARS", "20000")),
    "exec_secret": os.getenv("CLICKTHROUGH_EXEC_SECRET", "").strip(),
}