"""Insert rows into ClickHouse via the HTTP interface (port 8123)."""

import json
import urllib.error
import urllib.parse
import urllib.request


def clickhouse_insert_rows(
    base_url: str,
    table: str,
    rows: list[dict],
    *,
    user: str = "default",
    password: str = "",
    database: str = "analytics",
    timeout: float = 30.0,
) -> int:
    """Insert a list of dicts into a ClickHouse table using JSONEachRow format.

    Args:
        base_url: ClickHouse HTTP base URL without trailing slash,
                  e.g. "http://127.0.0.1:18123".
        table:    Fully-qualified or bare table name, e.g. "analytics.gnula_movies".
        rows:     List of dicts to insert. Each dict becomes one JSON line.
        user:     ClickHouse username (default "default").
        password: ClickHouse password (default empty string).
        database: Target database sent as query param (default "analytics").
        timeout:  Socket timeout in seconds (default 30.0).

    Returns:
        Number of rows inserted (len(rows)). Returns 0 if rows is empty
        without contacting the server.

    Raises:
        ValueError: On non-200 HTTP response, with status code and first
                    500 chars of the response body.
        urllib.error.URLError: On network-level errors (connection refused,
                               DNS failure, timeout).
    """
    if not rows:
        return 0

    query = f"INSERT INTO {table} FORMAT JSONEachRow"
    params = urllib.parse.urlencode({"database": database, "query": query})
    url = f"{base_url}/?{params}"

    body = "\n".join(json.dumps(row, ensure_ascii=False) for row in rows)
    body_bytes = body.encode("utf-8")

    req = urllib.request.Request(
        url,
        data=body_bytes,
        method="POST",
        headers={
            "Content-Type": "text/plain",
            "X-ClickHouse-User": user,
            "X-ClickHouse-Key": password,
        },
    )

    try:
        with urllib.request.urlopen(req, timeout=timeout) as resp:
            if resp.status != 200:
                body_preview = resp.read(500).decode("utf-8", errors="replace")
                raise ValueError(
                    f"ClickHouse insert failed: HTTP {resp.status} — {body_preview}"
                )
            return len(rows)
    except urllib.error.HTTPError as exc:
        body_preview = exc.read(500).decode("utf-8", errors="replace")
        raise ValueError(
            f"ClickHouse insert failed: HTTP {exc.code} — {body_preview}"
        ) from exc