"""Shared HTTP helper for the Muninn API scripts.

Not meant to be run directly - imported by sites.py, accounts.py, posts.py.
"""

import json
import os
import sys
import urllib.error
import urllib.parse
import urllib.request

DEFAULT_BASE_URL = "http://localhost:8001"


def base_url() -> str:
    return os.environ.get("MUNINN_API_URL", DEFAULT_BASE_URL).rstrip("/")


def request(method: str, path: str, params: dict | None = None, body: dict | None = None) -> None:
    """Call the API and print the JSON response to stdout.

    Exits 0 on a 2xx response. On an HTTP error or network failure, prints
    a JSON error object to stderr and exits 1.
    """
    url = f"{base_url()}{path}"

    if params:
        query = "&".join(
            f"{key}={urllib.parse.quote(str(value))}"
            for key, value in params.items()
            if value is not None
        )
        if query:
            url = f"{url}?{query}"

    data = json.dumps(body).encode("utf-8") if body is not None else None
    headers = {"Accept": "application/json"}
    if data is not None:
        headers["Content-Type"] = "application/json"

    req = urllib.request.Request(url, data=data, method=method, headers=headers)

    try:
        with urllib.request.urlopen(req) as response:
            payload = response.read().decode("utf-8")
    except urllib.error.HTTPError as error:
        body_text = error.read().decode("utf-8")
        try:
            parsed = json.loads(body_text)
        except json.JSONDecodeError:
            parsed = {"error": body_text}
        print(json.dumps(parsed, indent=2), file=sys.stderr)
        sys.exit(1)
    except urllib.error.URLError as error:
        print(json.dumps({"error": f"could not reach {url}: {error.reason}"}, indent=2), file=sys.stderr)
        sys.exit(1)

    if payload:
        parsed = json.loads(payload)
        print(json.dumps(parsed, indent=2))
    sys.exit(0)