# This file is part of the MapProxy project.
# Copyright (C) 2011 Omniscale <http://omniscale.de>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import sys
import os
import shutil
import stat
import tempfile

import pytest

from mapproxy.client.cgi import CGIClient, split_cgi_response
from mapproxy.client.http import HTTPClientError
from mapproxy.source import SourceError

@pytest.mark.skipif(sys.version_info < (3, 0), reason="tests skipped for python 2")
class TestSplitHTTPResponse(object):
    def test_n(self):
        assert split_cgi_response(b'header1: foo\nheader2: bar\n\ncontent\n\ncontent')  == \
            ({'Header1': 'foo', 'Header2': 'bar'}, b'content\n\ncontent')
    def test_rn(self):
        assert split_cgi_response(b'header1\r\nheader2\r\n\r\ncontent\r\n\r\ncontent')  == \
            ({'Header1': None, 'Header2': None}, b'content\r\n\r\ncontent')
    def test_mixed(self):
        assert split_cgi_response(b'header1: bar:foo\r\nheader2\n\r\ncontent\r\n\r\ncontent')  == \
            ({'Header1': 'bar:foo', 'Header2': None}, b'content\r\n\r\ncontent')
        assert split_cgi_response(b'header1\r\nheader2\n\ncontent\r\n\r\ncontent')  == \
            ({'Header1': None, 'Header2': None}, b'content\r\n\r\ncontent')
        assert split_cgi_response(b'header1\nheader2\r\n\r\ncontent\r\n\r\ncontent')  == \
            ({'Header1': None, 'Header2': None}, b'content\r\n\r\ncontent')
    def test_no_header(self):
        assert split_cgi_response(b'content\r\ncontent')  == \
            ({}, b'content\r\ncontent')


TEST_CGI_SCRIPT = br"""#! /usr/bin/env python3
import sys
import os
w = sys.stdout.write
w("Content-type: text/plain\r\n")
w("\r\n")
w(os.environ['QUERY_STRING'])
"""

TEST_CGI_SCRIPT_FAIL = TEST_CGI_SCRIPT + b'\nexit(1)'

TEST_CGI_SCRIPT_CWD = TEST_CGI_SCRIPT + br"""
if not os.path.exists('testfile'):
    exit(2)
"""

@pytest.mark.skipif(sys.platform == 'win32', reason="tests not ported to windows")
@pytest.mark.skipif(sys.version_info < (3, 0), reason="tests skipped for python 2")
class TestCGIClient(object):
    def setup_method(self):
        self.script_dir = tempfile.mkdtemp()

    def teardown_method(self):
        shutil.rmtree(self.script_dir)

    def create_script(self, script=TEST_CGI_SCRIPT, executable=True):
        script_file = os.path.join(self.script_dir, 'minimal_cgi.py')
        with open(script_file, 'wb') as f:
            f.write(script)
        if executable:
            os.chmod(script_file, stat.S_IXUSR | stat.S_IRUSR | stat.S_IWUSR)
        return script_file

    def test_missing_script(self):
        client = CGIClient('/tmp/doesnotexist')
        try:
            client.open('http://example.org/service?hello=bar')
        except SourceError:
            pass
        else:
            assert False, 'expected SourceError'

    def test_script_not_executable(self):
        script = self.create_script(executable=False)
        client = CGIClient(script)
        try:
            client.open('http://example.org/service?hello=bar')
        except SourceError:
            pass
        else:
            assert False, 'expected SourceError'

    def test_call(self):
        script = self.create_script()
        client = CGIClient(script)
        resp = client.open('http://example.org/service?hello=bar')
        assert resp.headers['Content-type'] == 'text/plain'
        assert resp.read() == b'hello=bar'

    def test_failed_call(self):
        script = self.create_script(TEST_CGI_SCRIPT_FAIL)
        client = CGIClient(script)
        try:
            client.open('http://example.org/service?hello=bar')
        except HTTPClientError:
            pass
        else:
            assert False, 'expected HTTPClientError'

    def test_working_directory(self):
        tmp_work_dir = os.path.join(self.script_dir, 'tmp')
        os.mkdir(tmp_work_dir)
        tmp_file = os.path.join(tmp_work_dir, 'testfile')
        open(tmp_file, 'wb')

        # start script in default directory
        script = self.create_script(TEST_CGI_SCRIPT_CWD)
        client = CGIClient(script)
        try:
            client.open('http://example.org/service?hello=bar')
        except HTTPClientError:
            pass
        else:
            assert False, 'expected HTTPClientError'

        # start in tmp_work_dir
        client = CGIClient(script, working_directory=tmp_work_dir)
        client.open('http://example.org/service?hello=bar')

