import collections
import os
import subprocess
import sys
import time
import unittest

from docker import DockerClient, errors

from test.python.docker import Podman, common, constant


class TestImages(unittest.TestCase):
    podman = None  # initialized podman configuration for tests
    service = None  # podman service instance

    def setUp(self):
        super().setUp()
        self.client = DockerClient(base_url="tcp://127.0.0.1:8080", timeout=15)

        TestImages.podman.restore_image_from_cache(self.client)

    def tearDown(self):
        common.remove_all_images(self.client)
        self.client.close()
        return super().tearDown()

    @classmethod
    def setUpClass(cls):
        super().setUpClass()
        TestImages.podman = Podman()
        TestImages.service = TestImages.podman.open(
            "system", "service", "tcp:127.0.0.1:8080", "--time=0"
        )
        # give the service some time to be ready...
        time.sleep(2)

        returncode = TestImages.service.poll()
        if returncode is not None:
            raise subprocess.CalledProcessError(returncode, "podman system service")

    @classmethod
    def tearDownClass(cls):
        TestImages.service.terminate()
        stdout, stderr = TestImages.service.communicate(timeout=0.5)
        if stdout:
            sys.stdout.write("\nImages Service Stdout:\n" + stdout.decode("utf-8"))
        if stderr:
            sys.stderr.write("\nImAges Service Stderr:\n" + stderr.decode("utf-8"))

        TestImages.podman.tear_down()
        return super().tearDownClass()

    def test_tag_valid_image(self):
        """Validates if the image is tagged successfully"""
        alpine = self.client.images.get(constant.ALPINE)
        self.assertTrue(alpine.tag("demo", constant.ALPINE_SHORTNAME))

        alpine = self.client.images.get(constant.ALPINE)
        for t in alpine.tags:
            self.assertIn("alpine", t)

    # @unittest.skip("doesn't work now")
    def test_retag_valid_image(self):
        """Validates if name updates when the image is retagged"""
        alpine = self.client.images.get(constant.ALPINE)
        self.assertTrue(alpine.tag("demo", "rename"))

        alpine = self.client.images.get(constant.ALPINE)
        self.assertNotIn("demo:test", alpine.tags)

    def test_list_images(self):
        """List images"""
        self.assertEqual(len(self.client.images.list()), 1)

        # Add more images
        self.client.images.pull(constant.BB)
        self.assertEqual(len(self.client.images.list()), 2)

        # List images with filter
        self.assertEqual(len(self.client.images.list(filters={"reference": "alpine"})), 1)

    def test_search_image(self):
        """Search for image"""
        for r in self.client.images.search("alpine"):
            self.assertIn("alpine", r["Name"])

    def test_search_bogus_image(self):
        """Search for bogus image should throw exception"""
        try:
            r = self.client.images.search("bogus/bogus")
        except:
            return
        self.assertTrue(len(r)==0)

    def test_remove_image(self):
        """Remove image"""
        # Check for error with wrong image name
        with self.assertRaises(errors.NotFound):
            self.client.images.remove("dummy")
        self.assertEqual(len(self.client.images.list()), 1)

        self.client.images.remove(constant.ALPINE)
        self.assertEqual(len(self.client.images.list()), 0)

    def test_image_history(self):
        """Image history"""
        img = self.client.images.get(constant.ALPINE)
        history = img.history()
        image_id = img.id[7:] if img.id.startswith("sha256:") else img.id

        found = False
        for change in history:
            found |= image_id in change.values()
        self.assertTrue(found, f"image id {image_id} not found in history")

    def test_get_image_exists_not(self):
        """Negative test for get image"""
        with self.assertRaises(errors.NotFound):
            response = self.client.images.get("image_does_not_exists")
            collections.deque(response)

    def test_save_image(self):
        """Export Image"""
        image = self.client.images.pull(constant.BB)

        file = os.path.join(TestImages.podman.image_cache, "busybox.tar")
        with open(file, mode="wb") as tarball:
            for frame in image.save(named=True):
                tarball.write(frame)
        sz = os.path.getsize(file)
        self.assertGreater(sz, 0)

    def test_load_image(self):
        """Import|Load Image"""
        self.assertEqual(len(self.client.images.list()), 1)

        image = self.client.images.pull(constant.BB)
        file = os.path.join(TestImages.podman.image_cache, "busybox.tar")
        with open(file, mode="wb") as tarball:
            for frame in image.save():
                tarball.write(frame)

        with open(file, mode="rb") as saved:
            _ = self.client.images.load(saved)

        self.assertEqual(len(self.client.images.list()), 2)


if __name__ == "__main__":
    # Setup temporary space
    unittest.main()