"""Configuration resolution for the opencode-bridge extension.

Priority order (highest to lowest):
  1. jupyter settings dict (from schema/plugin.json)
  2. Environment variables (OPENCODE_BRIDGE_URL, _USER, _PASSWORD)
  3. Built-in defaults
"""
from __future__ import annotations

import os
from typing import NamedTuple, Optional, Tuple

ENV_URL = "OPENCODE_BRIDGE_URL"
ENV_USER = "OPENCODE_BRIDGE_USER"
ENV_PASSWORD = "OPENCODE_BRIDGE_PASSWORD"

DEFAULT_URL = "http://127.0.0.1:4096"
DEFAULT_USER = "opencode"
DEFAULT_REQUEST_TIMEOUT = 120


class OpenCodeConfig(NamedTuple):
    url: str
    user: str
    password: str
    request_timeout_seconds: int = DEFAULT_REQUEST_TIMEOUT

    @property
    def auth(self) -> Optional[Tuple[str, str]]:
        """Return (user, password) for HTTP Basic Auth, or None if no password set."""
        if not self.password:
            return None
        return (self.user, self.password)


def resolve_config(jupyter_settings: dict) -> OpenCodeConfig:
    """Resolve OpenCode connection config from jupyter settings + env + defaults."""
    bridge = jupyter_settings.get("opencode_bridge", {}) or {}

    return OpenCodeConfig(
        url=bridge.get("opencodeServerUrl") or os.environ.get(ENV_URL) or DEFAULT_URL,
        user=bridge.get("opencodeServerUser") or os.environ.get(ENV_USER) or DEFAULT_USER,
        password=(
            bridge.get("opencodeServerPassword")
            or os.environ.get(ENV_PASSWORD)
            or ""
        ),
        request_timeout_seconds=int(
            bridge.get("requestTimeoutSeconds", DEFAULT_REQUEST_TIMEOUT)
        ),
    )