#
# Copyright 2018-2022 Elyra Authors
#
# 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 copy
import json
import os
import shutil

from jupyter_server.utils import url_path_join
import pytest
from tornado.httpclient import HTTPClientError

from elyra.metadata.schema import METADATA_TEST_SCHEMASPACE
from elyra.metadata.schema import METADATA_TEST_SCHEMASPACE_ID
from elyra.tests.metadata.test_utils import byo_metadata_json
from elyra.tests.metadata.test_utils import create_json_file
from elyra.tests.metadata.test_utils import get_instance
from elyra.tests.metadata.test_utils import invalid_metadata_json
from elyra.tests.metadata.test_utils import valid_metadata_json
from elyra.tests.util.handlers_utils import expected_http_error

os.environ["METADATA_TESTING"] = "1"  # Enable metadata-tests schemaspace


async def test_bogus_schemaspace(jp_fetch, bogus_location):
    # Validate missing is not found.  Remove the bogus location to ensure its not created
    shutil.rmtree(bogus_location)
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", "bogus", "missing")

    assert expected_http_error(e, 400)
    assert not os.path.exists(bogus_location)


async def test_missing_instance(jp_fetch, setup_data):
    # Validate missing is not found
    name = "missing"
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, name)
    assert expected_http_error(e, 404)


async def test_invalid_instance(jp_fetch, setup_data):
    # Validate invalid throws 404 with validation message
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "invalid")
    assert expected_http_error(e, 400)


async def test_valid_instance(jp_fetch, setup_data):
    # Ensure valid metadata can be found
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, "valid")

    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert "schema_name" in metadata
    assert metadata["display_name"] == "valid metadata instance"


async def test_get_instances(jp_fetch, setup_data):
    # Ensure all valid metadata can be found
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE_ID]
    assert len(instances) == 2
    assert isinstance(instances, list)
    assert get_instance(instances, "name", "another")
    assert get_instance(instances, "name", "valid")


async def test_get_empty_schemaspace_instances(jp_fetch, schemaspace_location, setup_data):
    # Delete the metadata dir contents and attempt listing metadata
    shutil.rmtree(schemaspace_location)
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE]
    assert len(instances) == 0

    # Now create empty schemaspace
    os.makedirs(schemaspace_location)
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE_ID]
    assert len(instances) == 0


async def test_get_hierarchy_instances(jp_fetch, setup_hierarchy):
    # Ensure all valid metadata can be found
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE]
    assert len(instances) == 3
    assert isinstance(instances, list)
    assert get_instance(instances, "name", "byo_1")
    assert get_instance(instances, "name", "byo_2")
    assert get_instance(instances, "name", "byo_3")
    byo_3 = get_instance(instances, "name", "byo_3")
    assert byo_3["display_name"] == "factory"


async def test_create_instance(jp_base_url, jp_fetch):
    """Create a simple instance - not conflicting with factory instances."""

    valid = copy.deepcopy(valid_metadata_json)
    valid["name"] = "valid"
    body = json.dumps(valid)

    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, body=body, method="POST")
    assert r.code == 201
    assert r.headers.get("Location") == url_path_join(
        jp_base_url, "/elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, "valid"
    )
    metadata = json.loads(r.body.decode())
    # Add expected "extra" fields to 'valid' so whole-object comparison is satisfied.
    # These are added during the pre_save(), post_save() and on_load() hooks on the
    # MockMetadataTest class instance or when default values for missing properties are applied.
    valid["pre_property"] = valid["metadata"]["required_test"]
    valid["post_property"] = valid["display_name"]
    valid["metadata"]["number_default_test"] = 42
    assert metadata == valid


async def test_create_hierarchy_instance(jp_fetch, setup_hierarchy):
    """Attempts to create an instance from one in the hierarchy."""

    byo_instance = copy.deepcopy(byo_metadata_json)
    byo_instance["display_name"] = "user"
    byo_instance["name"] = "byo_2"
    body = json.dumps(byo_instance)

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, body=body, method="POST")
    assert expected_http_error(e, 409)

    # Confirm the instance was not changed
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE]
    assert len(instances) == 3
    assert isinstance(instances, list)
    byo_2 = get_instance(instances, "name", "byo_2")
    assert byo_2["display_name"] == "factory"


async def test_create_invalid_instance(jp_fetch):
    """Create a simple instance - not conflicting with factory instances."""

    invalid = copy.deepcopy(invalid_metadata_json)
    invalid["name"] = "invalid"
    body = json.dumps(invalid)

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, body=body, method="POST")
    assert expected_http_error(e, 400)


async def test_create_instance_missing_schema(jp_fetch, schemaspace_location):
    """Attempt to create an instance using an invalid schema"""

    missing_schema = copy.deepcopy(valid_metadata_json)
    missing_schema["name"] = "missing_schema"
    missing_schema["schema_name"] = "missing_schema"
    missing_schema.pop("display_name")
    body = json.dumps(missing_schema)

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, body=body, method="POST")
    assert expected_http_error(e, 404)

    # Ensure instance was not created.  Can't use REST here since it will correctly trigger 404
    # even though an instance was created and not removed due to failure to validate (due to
    # missing schema).  Fixed by trapping the FileNotFoundError raised due to no schema.
    assert not os.path.exists(os.path.join(schemaspace_location, "missing_schema.json"))

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "missing_schema")
    assert expected_http_error(e, 404)


async def test_update_non_existent(jp_fetch, schemaspace_location):
    """Attempt to update a non-existent instance."""

    # Try to update a non-existent instance - 404 expected...
    valid = copy.deepcopy(valid_metadata_json)
    valid["name"] = "valid"
    valid["metadata"]["number_range_test"] = 7
    body = json.dumps(valid)

    # Update (non-existent) instance
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "valid", body=body, method="PUT")
    assert expected_http_error(e, 404)


async def test_update_instance(jp_fetch, schemaspace_location):
    """Update a simple instance."""

    # Create an instance, then update
    create_json_file(schemaspace_location, "valid.json", valid_metadata_json)
    valid = copy.deepcopy(valid_metadata_json)
    valid["name"] = "valid"
    valid["metadata"]["number_range_test"] = 7
    body = json.dumps(valid)

    # Update instance
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, "valid", body=body, method="PUT")
    assert r.code == 200
    instance = json.loads(r.body.decode())
    assert instance["metadata"]["number_range_test"] == 7

    # Confirm update via jp_fetch
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "valid")
    assert r.code == 200
    instance = json.loads(r.body.decode())
    assert instance["metadata"]["number_range_test"] == 7


async def test_invalid_update(jp_fetch, schemaspace_location):
    """Update a simple instance with invalid metadata."""

    # Create an instance, then update with invalid metadata
    create_json_file(schemaspace_location, "update_bad_md.json", valid_metadata_json)

    # Fetch it to get the valid instance
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "update_bad_md")
    assert r.code == 200
    instance = json.loads(r.body.decode())

    # Now attempt the update with bad metadata and ensure previous still exists
    valid2 = copy.deepcopy(valid_metadata_json)
    valid2["name"] = "valid"
    valid2["metadata"]["number_range_test"] = 42
    body2 = json.dumps(valid2)

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, "update_bad_md", body=body2, method="PUT")
    assert expected_http_error(e, 400)

    # Fetch again and ensure it matches the previous instance
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE_ID, "update_bad_md")
    assert r.code == 200
    instance2 = json.loads(r.body.decode())
    assert instance2 == instance


async def test_update_fields(jp_fetch, schemaspace_location):

    # Create an instance, then update with a new field
    create_json_file(schemaspace_location, "update_fields.json", valid_metadata_json)
    valid = copy.deepcopy(valid_metadata_json)
    valid["metadata"]["number_range_test"] = 7
    body = json.dumps(valid)

    # Update instance adding number_range_test
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "update_fields", body=body, method="PUT")
    assert r.code == 200
    instance = json.loads(r.body.decode())
    assert instance["metadata"]["number_range_test"] == 7

    # Add a new field (per schema) and remove another -
    valid["metadata"].pop("number_range_test")
    valid["metadata"]["string_length_test"] = "valid len"
    body = json.dumps(valid)

    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "update_fields", body=body, method="PUT")
    assert r.code == 200
    instance = json.loads(r.body.decode())
    assert instance["metadata"]["string_length_test"] == "valid len"
    assert "number_range_test" not in instance["metadata"]


async def test_update_hierarchy_instance(jp_fetch, setup_hierarchy):
    """Update a simple instance - that's conflicting with factory instances."""

    # Do not name intentionally, since this is an update
    byo_instance = copy.deepcopy(byo_metadata_json)
    byo_instance["display_name"] = "user"
    byo_instance["metadata"]["number_range_test"] = 7
    body = json.dumps(byo_instance)

    # Because this is considered an update, replacement is enabled.
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "byo_2", body=body, method="PUT")
    assert r.code == 200

    # Confirm the instances and ensure byo_2 is in USER area
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE)
    assert r.code == 200
    metadata = json.loads(r.body.decode())
    assert isinstance(metadata, dict)
    assert len(metadata) == 1
    instances = metadata[METADATA_TEST_SCHEMASPACE]
    assert len(instances) == 3
    assert isinstance(instances, list)
    byo_2 = get_instance(instances, "name", "byo_2")
    assert byo_2["schema_name"] == byo_metadata_json["schema_name"]
    assert byo_2["metadata"]["number_range_test"] == 7

    # Attempt to rename the resource, exception expected.
    byo_2["name"] = "byo_2_renamed"
    body = json.dumps(byo_2)

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "byo_2", body=body, method="PUT")
    assert expected_http_error(e, 400)

    # Confirm no update occurred
    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "byo_2")
    assert r.code == 200
    instance = json.loads(r.body.decode())
    assert instance["name"] == "byo_2"


async def test_delete_instance(jp_fetch, schemaspace_location, setup_data):
    """Create a simple instance - not conflicting with factory instances and delete it."""

    # First, attempt to delete non-existent resource, exception expected.
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "missing", method="DELETE")
    assert expected_http_error(e, 404)

    create_json_file(schemaspace_location, "valid.json", valid_metadata_json)

    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "valid", method="DELETE")
    assert r.code == 204

    # Confirm deletion
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "valid", method="DELETE")
    assert expected_http_error(e, 404)


async def test_delete_hierarchy_instance(jp_fetch, schemaspace_location, setup_hierarchy):
    """Create a simple instance - that conflicts with factory instances and delete it only if local."""

    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "byo_2", method="DELETE")
    assert expected_http_error(e, 403)

    # create local instance, delete should succeed
    create_json_file(schemaspace_location, "byo_2.json", byo_metadata_json)

    r = await jp_fetch("elyra", "metadata", METADATA_TEST_SCHEMASPACE, "byo_2", method="DELETE")
    assert r.code == 204


async def test_bogus_schema(jp_fetch):
    # Validate missing is not found

    # Remove self.request (and other 'self.' prefixes) once transition to jupyter_server occurs
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "schema", "bogus")
    assert expected_http_error(e, 404)


async def test_missing_runtimes_schema(jp_fetch):
    # Validate missing is not found
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "schema", "runtimes", "missing")
    assert expected_http_error(e, 404)


async def test_get_runtimes_schemas(jp_fetch):
    # Ensure all schema for runtimes can be found
    await _get_schemaspace_schemas(jp_fetch, "runtimes", ["kfp", "airflow"])


async def test_get_code_snippets_schemas(jp_fetch):
    # Ensure all schema for code-snippets can be found
    await _get_schemaspace_schemas(jp_fetch, "code-snippets", ["code-snippet"])


async def test_get_test_schemas(jp_fetch):
    # Ensure all schema for metadata_tests can be found
    await _get_schemaspace_schemas(jp_fetch, METADATA_TEST_SCHEMASPACE, ["metadata-test", "metadata-test2"])


async def test_get_runtimes_schema(jp_fetch):
    # Ensure all schema for runtimes can be found
    await _get_schemaspace_schema(jp_fetch, "runtimes", "kfp")


async def test_get_code_snippets_schema(jp_fetch):
    # Ensure all schema for code-snippets can be found
    await _get_schemaspace_schema(jp_fetch, "code-snippets", "code-snippet")


async def test_get_test_schema(jp_fetch):
    # Ensure all schema for metadata-test can be found
    await _get_schemaspace_schema(jp_fetch, METADATA_TEST_SCHEMASPACE, "metadata-test")


async def _get_schemaspace_schemas(jp_fetch, schemaspace, expected):
    r = await jp_fetch(
        "elyra",
        "schema",
        schemaspace,
    )
    assert r.code == 200
    schemaspace_schemas = json.loads(r.body.decode())
    assert isinstance(schemaspace_schemas, dict)
    assert len(schemaspace_schemas) == 1
    schemas = schemaspace_schemas[schemaspace]
    assert len(schemas) == len(expected)
    for expected_schema in expected:
        assert get_instance(schemas, "name", expected_schema)


async def _get_schemaspace_schema(jp_fetch, schemaspace, expected):
    r = await jp_fetch("elyra", "schema", schemaspace, expected)
    assert r.code == 200
    schemaspace_schema = json.loads(r.body.decode())
    assert isinstance(schemaspace_schema, dict)
    assert expected == schemaspace_schema["name"]
    assert schemaspace == schemaspace_schema["schemaspace"]


async def test_get_schemaspaces(jp_fetch):
    expected_schemaspaces = ["runtimes", "code-snippets"]

    r = await jp_fetch("elyra", "schemaspace")
    assert r.code == 200
    schemaspaces = json.loads(r.body.decode("utf-8"))
    assert isinstance(schemaspaces, dict)
    assert len(schemaspaces["schemaspaces"]) >= len(expected_schemaspaces)

    for expected_schemaspace in expected_schemaspaces:
        assert expected_schemaspace in schemaspaces["schemaspaces"]


async def test_get_schemaspace_info(jp_fetch):
    r = await jp_fetch("elyra", "schemaspace", METADATA_TEST_SCHEMASPACE)
    assert r.code == 200
    schemaspace_info = json.loads(r.body.decode("utf-8"))
    assert "name" in schemaspace_info
    assert "id" in schemaspace_info
    assert "display_name" in schemaspace_info
    assert "description" in schemaspace_info
    assert "schemas" not in schemaspace_info
    assert schemaspace_info["name"] == METADATA_TEST_SCHEMASPACE
    assert schemaspace_info["id"] == METADATA_TEST_SCHEMASPACE_ID


async def test_get_missing_schemaspace_info(jp_fetch):
    with pytest.raises(HTTPClientError) as e:
        await jp_fetch("elyra", "schemaspace", "missing-schemaspace")
    assert expected_http_error(e, 404)