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#
#   http://www.apache.org/licenses/LICENSE-2.0
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"""
Utility functions for tests.
"""

import asyncio
import os
import socket
import time

from apache_iggy import IggyClient

# Server-side limits: usernames are 3-50 bytes, passwords 3-100 bytes.
MIN_USERNAME_BYTES = 3
MAX_USERNAME_BYTES = 50
MIN_PASSWORD_BYTES = 3
MAX_PASSWORD_BYTES = 100

DEFAULT_TCP_PORT = 8090
DEFAULT_QUIC_PORT = 8080
DEFAULT_HTTP_PORT = 3000
DEFAULT_WEBSOCKET_PORT = 8092


def get_transport_config(port_env_var: str, default_port: int) -> tuple[str, int]:
    """
    Get transport-specific server configuration from environment variables or defaults.

    Args:
        port_env_var: Name of the environment variable holding the port.
        default_port: Port to use if the environment variable is not set.

    Returns:
        tuple: (host, port) for the Iggy server
    """
    host = os.environ.get("IGGY_SERVER_HOST", "127.0.0.1")
    port = int(os.environ.get(port_env_var, str(default_port)))

    # Convert hostname to IP address for the Rust client
    if host not in ("127.0.0.1", "localhost"):
        try:
            # Resolve hostname to IP address
            host_ip = socket.gethostbyname(host)
            host = host_ip
        except socket.gaierror:
            # If resolution fails, keep the original host
            pass
    elif host == "localhost":
        host = "127.0.0.1"

    return host, port


def get_server_config() -> tuple[str, int]:
    """
    Get TCP server configuration from environment variables or defaults.

    Returns:
        tuple: (host, port) for the Iggy server
    """
    return get_transport_config("IGGY_SERVER_TCP_PORT", DEFAULT_TCP_PORT)


def get_quic_server_config() -> tuple[str, int]:
    """
    Get QUIC server configuration from environment variables or defaults.

    Returns:
        tuple: (host, port) for the Iggy server
    """
    return get_transport_config("IGGY_SERVER_QUIC_PORT", DEFAULT_QUIC_PORT)


def get_http_server_config() -> tuple[str, int]:
    """
    Get HTTP server configuration from environment variables or defaults.

    Returns:
        tuple: (host, port) for the Iggy HTTP API
    """
    return get_transport_config("IGGY_SERVER_HTTP_PORT", DEFAULT_HTTP_PORT)


def get_websocket_server_config() -> tuple[str, int]:
    """
    Get WebSocket server configuration from environment variables or defaults.

    Returns:
        tuple: (host, port) for the Iggy server
    """
    return get_transport_config("IGGY_SERVER_WS_PORT", DEFAULT_WEBSOCKET_PORT)


def wait_for_server(host: str, port: int, timeout: int = 60, interval: int = 2) -> None:
    """
    Wait for the server to become available.

    Args:
        host: Server hostname or IP
        port: Server port
        timeout: Maximum time to wait in seconds
        interval: Time between connection attempts in seconds

    Raises:
        TimeoutError: If server doesn't become available within timeout
    """
    start_time = time.time()

    while True:
        try:
            with socket.create_connection((host, port), timeout=interval):
                return
        except (TimeoutError, ConnectionRefusedError, OSError) as err:
            elapsed_time = time.time() - start_time
            if elapsed_time >= timeout:
                raise TimeoutError(
                    f"Server not available at {host}:{port} after {timeout}s"
                ) from err
            time.sleep(interval)


async def wait_for_ping(
    client: IggyClient, timeout: int = 30, interval: int = 2
) -> None:
    """
    Wait for the server to respond to ping requests.

    Args:
        client: Iggy client instance
        timeout: Maximum time to wait in seconds
        interval: Time between ping attempts in seconds

    Raises:
        TimeoutError: If server doesn't respond to ping within timeout
    """
    start_time = time.time()

    while True:
        try:
            await client.ping()
            return
        except Exception as err:
            elapsed_time = time.time() - start_time
            if elapsed_time >= timeout:
                raise TimeoutError(
                    f"Server not responding to ping after {timeout}s"
                ) from err
            await asyncio.sleep(interval)


def unique_credentials(unique_name) -> tuple[str, str]:
    """Return a unique (username, password) pair within the server limits."""
    username = unique_name(max_bytes=MAX_USERNAME_BYTES)
    password = unique_name(max_bytes=MAX_PASSWORD_BYTES)
    return username, password


async def login_fresh_client(username: str, password: str) -> IggyClient:
    """Connect a new client to the configured server and log in."""
    host, port = get_server_config()
    client = IggyClient(f"{host}:{port}")
    await client.connect()
    await wait_for_ping(client)
    await client.login_user(username, password)
    return client