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

import json
import logging
import os
import random
import re
import shutil
import signal
import subprocess
import time
import urllib.parse

import yaml


# Run a subprocess, capture its output and exit code in context.
def _run(ctx, argv):
    p = subprocess.Popen(argv, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
    stdout, stderr = p.communicate("")
    ctx["argv"] = argv
    ctx["stdout"] = stdout.decode("utf-8")
    ctx["stderr"] = stderr.decode("utf-8")
    ctx["exit"] = p.returncode


# Check that latest call of _run ended with an specific exit code.
def _run_exit(ctx, expected):
    if ctx["exit"] != expected:
        print("ctx:", ctx.as_dict())
    assert_eq(ctx["exit"], expected)


# Name of Rust binary, debug-build.
def _binary(name):
    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):
    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):
    logging.debug(f"Starting ewww with config file {filename}")
    config = get_file(filename).decode("UTF-8")
    config = yaml.safe_load(config)
    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])


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


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