#############################################################################
# Some helpers to make step functions simpler.

import logging
import os
import random
import shutil
import socket
import time
import urllib.parse

import yaml


# Name of Rust binary, debug-build.
def _binary(name):
    srcdir = globals()["srcdir"]
    return os.path.abspath(os.path.join(srcdir, "target", "debug", name))


# Write a file with given content.
def _write(filename, content):
    open(filename, "w").write(content)


# Construct a URL that points to server running on localhost by
# replacing the actual scheme and host with ones that work for test.
def _url(ctx, url):
    port = ctx["config"]["port"]
    c = urllib.parse.urlparse(url)
    host = c[1]
    c = (c[0], "localhost:{}".format(port)) + c[2:]
    return urllib.parse.urlunparse(c), host


#############################################################################
# The actual step functions.


# Fail: use this for unimplemented steps.
def fixme(*args, **kwargs):
    assert 0


# Create a file.
def create_file(ctx, filename=None, content=None):
    logging.debug(f"Creating file {filename} with {content}")
    dirname = os.path.dirname(filename)
    os.makedirs(dirname)
    _write(filename, content)


# Copy test certificate from source tree, where it's been created previously by
# ./check.
def copy_test_certificate(ctx, cert=None, key=None):
    srcdir = globals()["srcdir"]
    logging.debug(f"Copying test.pem, test.key from srcdir to {cert} and {key}")
    shutil.copy(os.path.join(srcdir, "test.pem"), cert)
    shutil.copy(os.path.join(srcdir, "test.key"), key)


# Start server using named configuration file.
def start_server(ctx, filename=None):
    get_file = globals()["get_file"]
    start_daemon = globals()["start_daemon"]
    logging.debug(f"Starting ewww with config file {filename}")
    config = get_file(filename).decode("UTF-8")
    config = yaml.safe_load(config)
    port = config["port"] = random.randint(2000, 30000)
    logging.debug(f"Picked randomly port for ewww: {config['port']}")
    ctx["config"] = config
    config = yaml.safe_dump(config)
    _write(filename, config)

    start_daemon(ctx, "ewww", [_binary("ewww"), filename])

    if not port_open("localhost", port, 5.0):
        stderr = open(ctx["daemon"]["ewww"]["stderr"]).read()
        logging.debug(f"Stderr from daemon: {stderr!r}")


# Wait for a port to be open
def port_open(host, port, timeout):
    logging.debug(f"Waiting for port localhost:{port} to be available")
    started = time.time()
    while time.time() < started + timeout:
        try:
            socket.create_connection((host, port), timeout=timeout)
            return True
        except socket.error:
            pass
    logging.error(f"Port localhost:{port} is not open")
    return False


# Stop previously started server.
def stop_server(ctx):
    stop_daemon = globals()["stop_daemon"]
    logging.debug("Stopping ewww")
    stop_daemon(ctx, "ewww")


# Make an HTTP request.
def request(ctx, method=None, url=None):
    http_request = globals()["http_request"]
    logging.debug(f"Making HTTP request to ewww: {method} {url}")
    url, host = _url(ctx, url)
    http_request(ctx, host=host, method=method, url=url)