#
# -*- coding: utf-8 -*-
# Wireshark tests
#
# Copyright (c) 2018 Peter Wu <peter@lekensteyn.nl>
#
# SPDX-License-Identifier: GPL-2.0-or-later
#
'''Fixtures that are specific to Wireshark.'''

import logging
import os
import re
import subprocess
import sys
import tempfile
import types

import fixtures
import config
import subprocesstest


@fixtures.fixture(scope='session')
def program_path():
    # XXX stop using config
    return config.program_path


@fixtures.fixture(scope='session')
def program(program_path):
    def resolver(name):
        dotexe = ''
        if sys.platform.startswith('win32'):
            dotexe = '.exe'
        path = os.path.normpath(os.path.join(program_path, name + dotexe))
        if not os.access(path, os.X_OK):
            fixtures.skip('Program %s is not available' % (name,))
        return path
    return resolver


@fixtures.fixture(scope='session')
def cmd_capinfos(program):
    return program('capinfos')


@fixtures.fixture(scope='session')
def cmd_dumpcap(program):
    return program('dumpcap')


@fixtures.fixture(scope='session')
def cmd_mergecap(program):
    return program('mergecap')


@fixtures.fixture(scope='session')
def cmd_rawshark(program):
    return program('rawshark')


@fixtures.fixture(scope='session')
def cmd_tshark(program):
    return program('tshark')


@fixtures.fixture(scope='session')
def cmd_text2pcap(program):
    return program('text2pcap')


@fixtures.fixture(scope='session')
def cmd_wireshark(program):
    return program('wireshark')


@fixtures.fixture(scope='session')
def features(cmd_tshark):
    '''Returns an object describing available features in tshark.'''
    try:
        # XXX stop using config
        tshark_v = subprocess.check_output(
            (cmd_tshark, '--version'),
            stderr=subprocess.PIPE,
            universal_newlines=True,
            env=config.baseEnv()
        )
        tshark_v = re.sub(r'\s+', ' ', tshark_v)
    except subprocess.CalledProcessError as ex:
        logging.warning('Failed to detect tshark features: %s', ex)
        tshark_v = ''
    gcry_m = re.search(r'with +Gcrypt +([0-9]+\.[0-9]+)', tshark_v)
    return types.SimpleNamespace(
        have_lua='with Lua' in tshark_v,
        have_nghttp2='with nghttp2' in tshark_v,
        have_kerberos='with MIT Kerberos' in tshark_v or 'with Heimdal Kerberos' in tshark_v,
        have_libgcrypt16=gcry_m and float(gcry_m.group(1)) >= 1.6,
        have_libgcrypt17=gcry_m and float(gcry_m.group(1)) >= 1.7,
    )


@fixtures.fixture(scope='session')
def dirs():
    '''Returns fixed directories containing test input.'''
    this_dir = os.path.dirname(__file__)
    return types.SimpleNamespace(
        baseline_dir=os.path.join(this_dir, 'baseline'),
        capture_dir=os.path.join(this_dir, 'captures'),
        config_dir=os.path.join(this_dir, 'config'),
        key_dir=os.path.join(this_dir, 'keys'),
        lua_dir=os.path.join(this_dir, 'lua'),
        tools_dir=os.path.join(this_dir, '..', 'tools'),
    )


@fixtures.fixture(scope='session')
def capture_file(dirs):
    '''Returns the path to a capture file.'''
    def resolver(filename):
        return os.path.join(dirs.capture_dir, filename)
    return resolver


@fixtures.fixture
def home_path():
    '''Per-test home directory, removed when finished.'''
    with tempfile.TemporaryDirectory(prefix='wireshark-tests-home-') as dirname:
        yield dirname


@fixtures.fixture
def conf_path(home_path):
    '''Path to the Wireshark configuration directory.'''
    if sys.platform.startswith('win32'):
        conf_path = os.path.join(home_path, 'Wireshark')
    else:
        conf_path = os.path.join(home_path, '.config', 'wireshark')
    os.makedirs(conf_path)
    return conf_path


@fixtures.fixture
def base_env(home_path, request):
    """A modified environment to ensure reproducible tests. Tests can modify
    this environment as they see fit."""
    env = os.environ.copy()
    env['TZ'] = 'UTC'
    home_env = 'APPDATA' if sys.platform.startswith('win32') else 'HOME'
    env[home_env] = home_path

    # Remove this if test instances no longer inherit from SubprocessTestCase?
    if isinstance(request.instance, subprocesstest.SubprocessTestCase):
        # Inject the test environment as default if it was not overridden.
        request.instance.injected_test_env = env
    return env


@fixtures.fixture
def test_env(base_env, conf_path, request):
    '''A process environment with a populated configuration directory.'''
    # Populate our UAT files
    uat_files = [
        '80211_keys',
        'dtlsdecrypttablefile',
        'esp_sa',
        'ssl_keys',
        'c1222_decryption_table',
        'ikev1_decryption_table',
        'ikev2_decryption_table',
    ]
    for uat in uat_files:
        # XXX stop using config
        config.setUpUatFile(conf_path, uat)

    env = base_env
    env['WIRESHARK_RUN_FROM_BUILD_DIRECTORY'] = '1'
    env['WIRESHARK_QUIT_AFTER_CAPTURE'] = '1'

    # Remove this if test instances no longer inherit from SubprocessTestCase?
    if isinstance(request.instance, subprocesstest.SubprocessTestCase):
        # Inject the test environment as default if it was not overridden.
        request.instance.injected_test_env = env
    return env

# XXX capture: capture_interface