#!/usr/bin/env python
from __future__ import print_function
import subprocess
import optparse
import time
import sys
import os
import glob
try:
    # We don't actually need typing, but it's a good guard for being
    # outside a Zulip virtualenv.
    from typing import Iterable
    import requests
except ImportError as e:
    print("ImportError: {}".format(e))
    print("You need to run the Zulip tests inside a Zulip dev environment.")
    print("If you are using Vagrant, you can `vagrant ssh` to enter the Vagrant guest.")
    sys.exit(1)

#
# In order to use remote casperjs debugging, pass the --remote-debug flag
# This will start a remote debugging session listening on port 7777
#
# See https://wiki.zulip.net/wiki/Testing_the_app for more information
# on how to use remote debugging
#

os.environ["TORNADO_SERVER"] = "http://127.0.0.1:9983"

usage = """%prog [options]
    test-js-with-casper # Run all test files
    test-js-with-casper 09-navigation.js # Run a single test file
    test-js-with-casper 01-login.js 03-narrow.js # Run a few test files"""
parser = optparse.OptionParser(usage)

parser.add_option('--remote-debug',
                  help='Whether or not to enable remote debugging on port 7777',
                  action="store_true",
                  default=False)
(options, args) = parser.parse_args()

os.chdir(os.path.join(os.path.dirname(os.path.realpath(__file__)), '..'))

subprocess.check_call('tools/setup/generate-test-credentials')

subprocess.check_call(['rm', '-f'] + glob.glob('/tmp/casper-failure*.png'))

subprocess.check_call(['mkdir', '-p', 'var/casper'])

log = open('var/casper/server.log', 'w')

def assert_server_running(server):
    # type: (subprocess.Popen) -> None
    """Get the exit code of the server, or None if it is still running."""
    if server.poll() is not None:
        raise RuntimeError('Server died unexpectedly! Check var/casper/server.log')

def server_is_up(server):
    # type: (subprocess.Popen) -> bool
    assert_server_running(server)
    try:
        # We could get a 501 error if the reverse proxy is up but the Django app isn't.
        return requests.get('http://127.0.0.1:9981/accounts/home').status_code == 200
    except:
        return False

def run_tests(files):
    # type: (Iterable[str]) -> None
    test_files = []
    for file in files:
        if not os.path.exists(file):
            file = os.path.join(os.path.dirname(__file__), '../frontend_tests/casper_tests', file)
        test_files.append(os.path.abspath(file))

    subprocess.check_call('tools/setup/generate-fixtures')

    remote_debug = ""
    if options.remote_debug:
        remote_debug = "--remote-debugger-port=7777 --remote-debugger-autorun=yes"

    cmd = "frontend_tests/casperjs/bin/casperjs %s test " % (remote_debug,)
    if test_files:
        cmd += ' '.join(test_files)
    else:
        cmd += 'frontend_tests/casper_tests'

    # Run this not through the shell, so that we have the actual PID.
    server = subprocess.Popen(('tools/run-dev.py', '--test'),
                              stdout=log, stderr=log)

    ret = 1

    try:
        # Wait for the server to start up.
        sys.stdout.write('Waiting for test server')
        while not server_is_up(server):
            sys.stdout.write('.')
            sys.stdout.flush()
            time.sleep(0.1)
        sys.stdout.write('\n')

        print("Running %s" % (cmd,))
        ret = subprocess.call(cmd, shell=True)
    finally:
        assert_server_running(server)
        server.terminate()

    if ret != 0:
        print("""
Oops, the frontend tests failed. Tips for debugging:
 * Check the frontend test server logs at var/casper/server.log
 * Check the screenshots of failed tests at /tmp/casper-failure*.png
 * Try remote debugging the test web browser as described in docs/testing.rst
""", file=sys.stderr)

        sys.exit(ret)

run_tests(args)
sys.exit(0)