import hashlib
import json
from io import StringIO

from pylxd import exceptions, models
from pylxd.tests import testing


class TestImage(testing.PyLXDTestCase):
    """Tests for pylxd.models.Image."""

    def test_get(self):
        """An image is fetched."""
        fingerprint = hashlib.sha256(b"").hexdigest()
        a_image = models.Image.get(self.client, fingerprint)

        self.assertEqual(fingerprint, a_image.fingerprint)

    def test_get_not_found(self):
        """LXDAPIException is raised when the image isn't found."""

        def not_found(request, context):
            context.status_code = 404
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 404}
            )

        self.add_rule(
            {
                "text": not_found,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )

        fingerprint = hashlib.sha256(b"").hexdigest()

        self.assertRaises(
            exceptions.LXDAPIException, models.Image.get, self.client, fingerprint
        )

    def test_get_error(self):
        """LXDAPIException is raised on error."""

        def error(request, context):
            context.status_code = 500
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 500}
            )

        self.add_rule(
            {
                "text": error,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )

        fingerprint = hashlib.sha256(b"").hexdigest()

        self.assertRaises(
            exceptions.LXDAPIException, models.Image.get, self.client, fingerprint
        )

    def test_get_by_alias(self):
        fingerprint = hashlib.sha256(b"").hexdigest()

        a_image = models.Image.get_by_alias(self.client, "an-alias")

        self.assertEqual(fingerprint, a_image.fingerprint)

    def test_exists(self):
        """An image is fetched."""
        fingerprint = hashlib.sha256(b"").hexdigest()

        self.assertTrue(models.Image.exists(self.client, fingerprint))

    def test_exists_by_alias(self):
        """An image is fetched."""
        self.assertTrue(models.Image.exists(self.client, "an-alias", alias=True))

    def test_not_exists(self):
        """LXDAPIException is raised when the image isn't found."""

        def not_found(request, context):
            context.status_code = 404
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 404}
            )

        self.add_rule(
            {
                "text": not_found,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )

        fingerprint = hashlib.sha256(b"").hexdigest()

        self.assertFalse(models.Image.exists(self.client, fingerprint))

    def test_all(self):
        """A list of all images is returned."""
        images = models.Image.all(self.client)

        self.assertEqual(1, len(images))

    def test_create(self):
        """An image is created."""
        fingerprint = hashlib.sha256(b"").hexdigest()
        a_image = models.Image.create(self.client, b"", public=True)

        self.assertIsInstance(a_image, models.Image)
        self.assertEqual(fingerprint, a_image.fingerprint)

    def test_create_with_metadata(self):
        """An image with metadata is created."""
        fingerprint = hashlib.sha256(b"").hexdigest()
        a_image = models.Image.create(self.client, b"", metadata=b"", public=True)

        self.assertIsInstance(a_image, models.Image)
        self.assertEqual(fingerprint, a_image.fingerprint)

    def test_create_with_metadata_streamed(self):
        """An image with metadata is created."""
        fingerprint = hashlib.sha256(b"").hexdigest()
        a_image = models.Image.create(
            self.client, StringIO(""), metadata=StringIO(""), public=True
        )

        self.assertIsInstance(a_image, models.Image)
        self.assertEqual(fingerprint, a_image.fingerprint)

    def test_update(self):
        """An image is updated."""
        a_image = self.client.images.all()[0]
        a_image.sync()

        a_image.save()

    def test_fetch(self):
        """A partial object is fetched and populated."""
        a_image = self.client.images.all()[0]

        a_image.sync()

        self.assertEqual(1, a_image.size)

    def test_fetch_notfound(self):
        """A bogus image fetch raises LXDAPIException."""

        def not_found(request, context):
            context.status_code = 404
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 404}
            )

        self.add_rule(
            {
                "text": not_found,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )
        fingerprint = hashlib.sha256(b"").hexdigest()

        a_image = models.Image(self.client, fingerprint=fingerprint)

        self.assertRaises(exceptions.LXDAPIException, a_image.sync)

    def test_fetch_error(self):
        """A 500 error raises LXDAPIException."""

        def not_found(request, context):
            context.status_code = 500
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 500}
            )

        self.add_rule(
            {
                "text": not_found,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )
        fingerprint = hashlib.sha256(b"").hexdigest()

        a_image = models.Image(self.client, fingerprint=fingerprint)

        self.assertRaises(exceptions.LXDAPIException, a_image.sync)

    def test_delete(self):
        """An image is deleted."""
        # XXX: rockstar (03 Jun 2016) - This just executes
        # a code path. There should be an assertion here, but
        # it's not clear how to assert that, just yet.
        a_image = self.client.images.all()[0]

        a_image.delete(wait=True)

    def test_export(self):
        """An image is exported."""
        expected = "e2943f8d0b0e7d5835f9533722a6e25f669acb8980daee378b4edb44da212f51"
        a_image = self.client.images.all()[0]

        data = a_image.export()
        data_sha = hashlib.sha256(data.read()).hexdigest()

        self.assertEqual(expected, data_sha)

    def test_export_not_found(self):
        """LXDAPIException is raised on export of bogus image."""

        def not_found(request, context):
            context.status_code = 404
            return json.dumps(
                {"type": "error", "error": "Not found", "error_code": 404}
            )

        self.add_rule(
            {
                "text": not_found,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/export$",
            }
        )
        a_image = self.client.images.all()[0]

        self.assertRaises(exceptions.LXDAPIException, a_image.export)

    def test_export_error(self):
        """LXDAPIException is raised on API error."""

        def error(request, context):
            context.status_code = 500
            return json.dumps(
                {"type": "error", "error": "LOLOLOLOL", "error_code": 500}
            )

        self.add_rule(
            {
                "text": error,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855/export$",
            }
        )
        a_image = self.client.images.all()[0]

        self.assertRaises(exceptions.LXDAPIException, a_image.export)

    def test_add_alias(self):
        """Try to add an alias."""
        a_image = self.client.images.all()[0]
        a_image.add_alias("lol", "Just LOL")

        aliases = [a["name"] for a in a_image.aliases]
        self.assertTrue("lol" in aliases, "Image didn't get updated.")

    def test_add_alias_duplicate(self):
        """Adding a alias twice should raise an LXDAPIException."""

        def error(request, context):
            context.status_code = 409
            return json.dumps(
                {"type": "error", "error": "already exists", "error_code": 409}
            )

        self.add_rule(
            {
                "text": error,
                "method": "POST",
                "url": r"^http://pylxd.test/1.0/images/aliases$",
            }
        )

        a_image = self.client.images.all()[0]

        self.assertRaises(
            exceptions.LXDAPIException, a_image.add_alias, "lol", "Just LOL"
        )

    def test_remove_alias(self):
        """Try to remove an-alias."""
        a_image = self.client.images.all()[0]
        a_image.delete_alias("an-alias")

        self.assertEqual(0, len(a_image.aliases), "Alias didn't get deleted.")

    def test_remove_alias_error(self):
        """Try to remove an non existant alias."""

        def error(request, context):
            context.status_code = 404
            return json.dumps(
                {"type": "error", "error": "not found", "error_code": 404}
            )

        self.add_rule(
            {
                "text": error,
                "method": "DELETE",
                "url": r"^http://pylxd.test/1.0/images/aliases/lol$",
            }
        )

        a_image = self.client.images.all()[0]
        self.assertRaises(exceptions.LXDAPIException, a_image.delete_alias, "lol")

    def test_remove_alias_not_in_image(self):
        """Try to remove an alias which is not in the current image."""
        a_image = self.client.images.all()[0]
        a_image.delete_alias("b-alias")

    def test_copy(self):
        """Try to copy an image to another LXD instance."""
        from pylxd.client import Client

        a_image = self.client.images.all()[0]

        client2 = Client(endpoint="http://pylxd2.test")
        copied_image = a_image.copy(client2, wait=True)
        self.assertEqual(a_image.fingerprint, copied_image.fingerprint)

    def test_copy_public(self):
        """Try to copy a public image."""
        from pylxd.client import Client

        def image_get(request, context):
            context.status_code = 200
            return json.dumps(
                {
                    "type": "sync",
                    "metadata": {
                        "aliases": [
                            {
                                "name": "an-alias",
                                "fingerprint": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
                            }
                        ],
                        "architecture": "x86_64",
                        "cached": False,
                        "filename": "a_image.tar.bz2",
                        "fingerprint": "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
                        "public": True,
                        "properties": {},
                        "size": 1,
                        "auto_update": False,
                        "created_at": "1983-06-16T02:42:00Z",
                        "expires_at": "1983-06-16T02:42:00Z",
                        "last_used_at": "1983-06-16T02:42:00Z",
                        "uploaded_at": "1983-06-16T02:42:00Z",
                    },
                }
            )

        self.add_rule(
            {
                "text": image_get,
                "method": "GET",
                "url": r"^http://pylxd.test/1.0/images/e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855$",
            }
        )

        a_image = self.client.images.all()[0]
        self.assertTrue(a_image.public)

        client2 = Client(endpoint="http://pylxd2.test")
        copied_image = a_image.copy(client2, wait=True)
        self.assertEqual(a_image.fingerprint, copied_image.fingerprint)

    def test_copy_no_wait(self):
        """Try to copy and don't wait."""
        from pylxd.client import Client

        a_image = self.client.images.all()[0]

        client2 = Client(endpoint="http://pylxd2.test")
        a_image.copy(client2, public=False, auto_update=False)

    def test_create_from_simplestreams(self):
        """Try to create an image from simplestreams."""
        image = self.client.images.create_from_simplestreams(
            "https://cloud-images.ubuntu.com/releases", "trusty/amd64"
        )
        self.assertEqual(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
            image.fingerprint,
        )

    def test_create_from_url(self):
        """Try to create an image from an URL."""
        image = self.client.images.create_from_url("https://dl.stgraber.org/lxd")
        self.assertEqual(
            "e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855",
            image.fingerprint,
        )
