import contextlib
import json
import shutil
import socket
import tarfile
import tempfile
import threading

import pytest
import six
from six.moves import BaseHTTPServer
from six.moves import socketserver


import docker

from ..helpers import requires_api_version, requires_experimental
from .base import BaseAPIIntegrationTest, TEST_IMG


class ListImagesTest(BaseAPIIntegrationTest):
    def test_images(self):
        res1 = self.client.images(all=True)
        assert 'Id' in res1[0]
        res10 = res1[0]
        assert 'Created' in res10
        assert 'RepoTags' in res10
        distinct = []
        for img in res1:
            if img['Id'] not in distinct:
                distinct.append(img['Id'])
        assert len(distinct) == self.client.info()['Images']

    def test_images_quiet(self):
        res1 = self.client.images(quiet=True)
        assert type(res1[0]) == six.text_type


class PullImageTest(BaseAPIIntegrationTest):
    def test_pull(self):
        try:
            self.client.remove_image('hello-world')
        except docker.errors.APIError:
            pass
        res = self.client.pull('hello-world', tag='latest')
        self.tmp_imgs.append('hello-world')
        assert type(res) == six.text_type
        assert len(self.client.images('hello-world')) >= 1
        img_info = self.client.inspect_image('hello-world')
        assert 'Id' in img_info

    def test_pull_streaming(self):
        try:
            self.client.remove_image('hello-world')
        except docker.errors.APIError:
            pass
        stream = self.client.pull(
            'hello-world', tag='latest', stream=True, decode=True)
        self.tmp_imgs.append('hello-world')
        for chunk in stream:
            assert isinstance(chunk, dict)
        assert len(self.client.images('hello-world')) >= 1
        img_info = self.client.inspect_image('hello-world')
        assert 'Id' in img_info

    @requires_api_version('1.32')
    @requires_experimental(until=None)
    def test_pull_invalid_platform(self):
        with pytest.raises(docker.errors.APIError) as excinfo:
            self.client.pull('hello-world', platform='foobar')

        # Some API versions incorrectly returns 500 status; assert 4xx or 5xx
        assert excinfo.value.is_error()
        assert 'unknown operating system' in excinfo.exconly() \
               or 'invalid platform' in excinfo.exconly()


class CommitTest(BaseAPIIntegrationTest):
    def test_commit(self):
        container = self.client.create_container(TEST_IMG, ['touch', '/test'])
        id = container['Id']
        self.client.start(id)
        self.tmp_containers.append(id)
        res = self.client.commit(id)
        assert 'Id' in res
        img_id = res['Id']
        self.tmp_imgs.append(img_id)
        img = self.client.inspect_image(img_id)
        assert 'Container' in img
        assert img['Container'].startswith(id)
        assert 'ContainerConfig' in img
        assert 'Image' in img['ContainerConfig']
        assert TEST_IMG == img['ContainerConfig']['Image']
        busybox_id = self.client.inspect_image(TEST_IMG)['Id']
        assert 'Parent' in img
        assert img['Parent'] == busybox_id

    def test_commit_with_changes(self):
        cid = self.client.create_container(TEST_IMG, ['touch', '/test'])
        self.tmp_containers.append(cid)
        self.client.start(cid)
        img_id = self.client.commit(
            cid, changes=['EXPOSE 8000', 'CMD ["bash"]']
        )
        self.tmp_imgs.append(img_id)
        img = self.client.inspect_image(img_id)
        assert 'Container' in img
        assert img['Container'].startswith(cid['Id'])
        assert '8000/tcp' in img['Config']['ExposedPorts']
        assert img['Config']['Cmd'] == ['bash']


class RemoveImageTest(BaseAPIIntegrationTest):
    def test_remove(self):
        container = self.client.create_container(TEST_IMG, ['touch', '/test'])
        id = container['Id']
        self.client.start(id)
        self.tmp_containers.append(id)
        res = self.client.commit(id)
        assert 'Id' in res
        img_id = res['Id']
        self.tmp_imgs.append(img_id)
        logs = self.client.remove_image(img_id, force=True)
        assert {"Deleted": img_id} in logs
        images = self.client.images(all=True)
        res = [x for x in images if x['Id'].startswith(img_id)]
        assert len(res) == 0


class ImportImageTest(BaseAPIIntegrationTest):
    '''Base class for `docker import` test cases.'''

    TAR_SIZE = 512 * 1024

    def write_dummy_tar_content(self, n_bytes, tar_fd):
        def extend_file(f, n_bytes):
            f.seek(n_bytes - 1)
            f.write(bytearray([65]))
            f.seek(0)

        tar = tarfile.TarFile(fileobj=tar_fd, mode='w')

        with tempfile.NamedTemporaryFile() as f:
            extend_file(f, n_bytes)
            tarinfo = tar.gettarinfo(name=f.name, arcname='testdata')
            tar.addfile(tarinfo, fileobj=f)

        tar.close()

    @contextlib.contextmanager
    def dummy_tar_stream(self, n_bytes):
        '''Yields a stream that is valid tar data of size n_bytes.'''
        with tempfile.NamedTemporaryFile() as tar_file:
            self.write_dummy_tar_content(n_bytes, tar_file)
            tar_file.seek(0)
            yield tar_file

    @contextlib.contextmanager
    def dummy_tar_file(self, n_bytes):
        '''Yields the name of a valid tar file of size n_bytes.'''
        with tempfile.NamedTemporaryFile(delete=False) as tar_file:
            self.write_dummy_tar_content(n_bytes, tar_file)
            tar_file.seek(0)
            yield tar_file.name

    def test_import_from_bytes(self):
        with self.dummy_tar_stream(n_bytes=500) as f:
            content = f.read()

        # The generic import_image() function cannot import in-memory bytes
        # data that happens to be represented as a string type, because
        # import_image() will try to use it as a filename and usually then
        # trigger an exception. So we test the import_image_from_data()
        # function instead.
        statuses = self.client.import_image_from_data(
            content, repository='test/import-from-bytes')

        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        img_id = result['status']
        self.tmp_imgs.append(img_id)

    def test_import_from_file(self):
        with self.dummy_tar_file(n_bytes=self.TAR_SIZE) as tar_filename:
            # statuses = self.client.import_image(
            #     src=tar_filename, repository='test/import-from-file')
            statuses = self.client.import_image_from_file(
                tar_filename, repository='test/import-from-file')

        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        assert 'status' in result
        img_id = result['status']
        self.tmp_imgs.append(img_id)

    def test_import_from_stream(self):
        with self.dummy_tar_stream(n_bytes=self.TAR_SIZE) as tar_stream:
            statuses = self.client.import_image(
                src=tar_stream, repository='test/import-from-stream')
            # statuses = self.client.import_image_from_stream(
            #     tar_stream, repository='test/import-from-stream')
        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        assert 'status' in result
        img_id = result['status']
        self.tmp_imgs.append(img_id)

    def test_import_image_from_data_with_changes(self):
        with self.dummy_tar_stream(n_bytes=500) as f:
            content = f.read()

        statuses = self.client.import_image_from_data(
            content, repository='test/import-from-bytes',
            changes=['USER foobar', 'CMD ["echo"]']
        )

        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        img_id = result['status']
        self.tmp_imgs.append(img_id)

        img_data = self.client.inspect_image(img_id)
        assert img_data is not None
        assert img_data['Config']['Cmd'] == ['echo']
        assert img_data['Config']['User'] == 'foobar'

    def test_import_image_with_changes(self):
        with self.dummy_tar_file(n_bytes=self.TAR_SIZE) as tar_filename:
            statuses = self.client.import_image(
                src=tar_filename, repository='test/import-from-file',
                changes=['USER foobar', 'CMD ["echo"]']
            )

        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        img_id = result['status']
        self.tmp_imgs.append(img_id)

        img_data = self.client.inspect_image(img_id)
        assert img_data is not None
        assert img_data['Config']['Cmd'] == ['echo']
        assert img_data['Config']['User'] == 'foobar'

    # Docs say output is available in 1.23, but this test fails on 1.12.0
    @requires_api_version('1.24')
    def test_get_load_image(self):
        test_img = 'hello-world:latest'
        self.client.pull(test_img)
        data = self.client.get_image(test_img)
        assert data
        output = self.client.load_image(data)
        assert any([
            line for line in output
            if 'Loaded image: {}'.format(test_img) in line.get('stream', '')
        ])

    @contextlib.contextmanager
    def temporary_http_file_server(self, stream):
        '''Serve data from an IO stream over HTTP.'''

        class Handler(BaseHTTPServer.BaseHTTPRequestHandler):
            def do_GET(self):
                self.send_response(200)
                self.send_header('Content-Type', 'application/x-tar')
                self.end_headers()
                shutil.copyfileobj(stream, self.wfile)

        server = socketserver.TCPServer(('', 0), Handler)
        thread = threading.Thread(target=server.serve_forever)
        thread.setDaemon(True)
        thread.start()

        yield 'http://%s:%s' % (socket.gethostname(), server.server_address[1])

        server.shutdown()

    @pytest.mark.skipif(True, reason="Doesn't work inside a container - FIXME")
    def test_import_from_url(self):
        # The crappy test HTTP server doesn't handle large files well, so use
        # a small file.
        tar_size = 10240

        with self.dummy_tar_stream(n_bytes=tar_size) as tar_data:
            with self.temporary_http_file_server(tar_data) as url:
                statuses = self.client.import_image(
                    src=url, repository='test/import-from-url')

        result_text = statuses.splitlines()[-1]
        result = json.loads(result_text)

        assert 'error' not in result

        assert 'status' in result
        img_id = result['status']
        self.tmp_imgs.append(img_id)


@requires_api_version('1.25')
class PruneImagesTest(BaseAPIIntegrationTest):
    def test_prune_images(self):
        try:
            self.client.remove_image('hello-world')
        except docker.errors.APIError:
            pass

        # Ensure busybox does not get pruned
        ctnr = self.client.create_container(TEST_IMG, ['sleep', '9999'])
        self.tmp_containers.append(ctnr)

        self.client.pull('hello-world', tag='latest')
        self.tmp_imgs.append('hello-world')
        img_id = self.client.inspect_image('hello-world')['Id']
        result = self.client.prune_images()
        assert img_id not in [
            img.get('Deleted') for img in result.get('ImagesDeleted') or []
        ]
        result = self.client.prune_images({'dangling': False})
        assert result['SpaceReclaimed'] > 0
        assert 'hello-world:latest' in [
            img.get('Untagged') for img in result['ImagesDeleted']
        ]
        assert img_id in [
            img.get('Deleted') for img in result['ImagesDeleted']
        ]


class SaveLoadImagesTest(BaseAPIIntegrationTest):
    @requires_api_version('1.23')
    def test_get_image_load_image(self):
        with tempfile.TemporaryFile() as f:
            stream = self.client.get_image(TEST_IMG)
            for chunk in stream:
                f.write(chunk)

            f.seek(0)
            result = self.client.load_image(f.read())

        success = False
        result_line = 'Loaded image: {}\n'.format(TEST_IMG)
        for data in result:
            print(data)
            if 'stream' in data:
                if data['stream'] == result_line:
                    success = True
                    break
        assert success is True


@requires_api_version('1.30')
class InspectDistributionTest(BaseAPIIntegrationTest):
    def test_inspect_distribution(self):
        data = self.client.inspect_distribution('busybox:latest')
        assert data is not None
        assert 'Platforms' in data
        assert {'os': 'linux', 'architecture': 'amd64'} in data['Platforms']
