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"""ProxyEndpoint — single source of truth for "where is the proxy + what key".

Every agent runner reads this from environment, then hands the resulting
object to `agents.cliproxyapi.env.*` to build SDK-specific configuration.

Env vars:
    CLIPROXYAPI_HOST   default 127.0.0.1
    CLIPROXYAPI_PORT   default 8317  (CLIProxyAPI's stock port)
    CLIPROXYAPI_KEY    required — must match one of the api-keys: entries
                       in your CLIProxyAPI config.yaml
"""

from __future__ import annotations

import os
from dataclasses import dataclass

DEFAULT_HOST = "127.0.0.1"
DEFAULT_PORT = 8317


@dataclass(frozen=True)
class ProxyEndpoint:
    host: str = DEFAULT_HOST
    port: int = DEFAULT_PORT
    api_key: str = ""

    @classmethod
    def from_env(cls) -> "ProxyEndpoint":
        host = os.environ.get("CLIPROXYAPI_HOST", DEFAULT_HOST)
        port = int(os.environ.get("CLIPROXYAPI_PORT", str(DEFAULT_PORT)))
        api_key = os.environ.get("CLIPROXYAPI_KEY", "").strip()
        if not api_key:
            raise SystemExit(
                "CLIPROXYAPI_KEY is unset. Set it to one of the api-keys "
                "you've configured in your CLIProxyAPI config.yaml.\n"
                "Example:\n"
                "  export CLIPROXYAPI_KEY=$(grep -A1 'api-keys:' "
                "~/.cli-proxy-api/config.yaml | tail -1 | tr -d ' \"-')"
            )
        return cls(host=host, port=port, api_key=api_key)

    def base_url(self, scheme: str = "http") -> str:
        return f"{scheme}://{self.host}:{self.port}"