from __future__ import annotations

import json
import os
import urllib.error
import urllib.request
from typing import Any


def service_base_url(explicit: str | None = None) -> str:
    base = (explicit or os.environ.get("REUSE_SURFACE_URL", "")).rstrip("/")
    if not base:
        raise ValueError(
            "service URL not configured; set REUSE_SURFACE_URL or pass --base-url"
        )
    return base


def service_token() -> str | None:
    return os.environ.get("REUSE_SURFACE_TOKEN")


def _request(
    method: str,
    url: str,
    *,
    token: str | None = None,
    body: dict[str, Any] | None = None,
) -> tuple[int, Any]:
    headers = {"Accept": "application/json", "User-Agent": "reuse-surface/0.1"}
    data = None
    if body is not None:
        headers["Content-Type"] = "application/json"
        data = json.dumps(body).encode("utf-8")
    if token:
        headers["Authorization"] = f"Bearer {token}"
    request = urllib.request.Request(url, data=data, headers=headers, method=method)
    try:
        with urllib.request.urlopen(request, timeout=30) as response:
            raw = response.read().decode("utf-8")
            return response.status, json.loads(raw) if raw else None
    except urllib.error.HTTPError as exc:
        raw = exc.read().decode("utf-8")
        try:
            payload = json.loads(raw) if raw else {"message": exc.reason}
        except json.JSONDecodeError:
            payload = {"message": raw or exc.reason}
        return exc.code, payload


def hub_status(base_url: str | None = None) -> tuple[int, Any]:
    return _request("GET", f"{service_base_url(base_url)}/health")


def hub_list(base_url: str | None = None) -> tuple[int, Any]:
    return _request("GET", f"{service_base_url(base_url)}/v1/repos")


def hub_show(repo: str, base_url: str | None = None) -> tuple[int, Any]:
    return _request("GET", f"{service_base_url(base_url)}/v1/repos/{repo}")


def hub_register(payload: dict[str, Any], base_url: str | None = None) -> tuple[int, Any]:
    token = service_token()
    if not token:
        raise ValueError("REUSE_SURFACE_TOKEN is required for register")
    return _request(
        "POST",
        f"{service_base_url(base_url)}/v1/repos",
        token=token,
        body=payload,
    )


def hub_update(
    repo: str, payload: dict[str, Any], base_url: str | None = None
) -> tuple[int, Any]:
    token = service_token()
    if not token:
        raise ValueError("REUSE_SURFACE_TOKEN is required for update")
    return _request(
        "PATCH",
        f"{service_base_url(base_url)}/v1/repos/{repo}",
        token=token,
        body=payload,
    )