import json
from xml.etree import ElementTree

from behave import then


@then("the output should be parsable as json")
def check_output_json(context):
    out = context.stdout_capture.getvalue()
    assert json.loads(out), out


@then('"{field}" in the json output should have {number:d} elements')
@then('"{field}" in the json output should have 1 element')
def check_output_field(context, field, number=1):
    out = context.stdout_capture.getvalue()
    out_json = json.loads(out)
    assert field in out_json, [field, out_json]
    assert len(out_json[field]) == number, len(out_json[field])


@then('"{field}" in the json output should not contain "{key}"')
def check_output_field_not_key(context, field, key):
    out = context.stdout_capture.getvalue()
    out_json = json.loads(out)
    assert field in out_json
    assert key not in out_json[field]


@then('"{field}" in the json output should contain "{key}"')
def check_output_field_key(context, field, key):
    out = context.stdout_capture.getvalue()
    out_json = json.loads(out)
    assert field in out_json
    assert key in out_json[field]


@then('the json output should contain {path} = "{value}"')
def check_json_output_path(context, path, value):
    """ E.g.
    the json output should contain entries.0.title = "hello"
    """
    out = context.stdout_capture.getvalue()
    struct = json.loads(out)

    for node in path.split("."):
        try:
            struct = struct[int(node)]
        except ValueError:
            struct = struct[node]
    assert struct == value, struct


@then('the output should be a valid XML string')
def assert_valid_xml_string(context):
    output = context.stdout_capture.getvalue()
    xml_tree = ElementTree.fromstring(output)
    assert xml_tree, output


@then('"entries" node in the xml output should have {number:d} elements')
def assert_xml_output_entries_count(context, number):
    output = context.stdout_capture.getvalue()
    xml_tree = ElementTree.fromstring(output)

    xml_tags = (node.tag for node in xml_tree)
    assert "entries" in xml_tags, str(list(xml_tags))

    actual_entry_count = len(xml_tree.find("entries"))
    assert actual_entry_count == number, actual_entry_count


@then('"tags" in the xml output should contain {expected_tags_json_list}')
def assert_xml_output_tags(context, expected_tags_json_list):
    output = context.stdout_capture.getvalue()
    xml_tree = ElementTree.fromstring(output)

    xml_tags = (node.tag for node in xml_tree)
    assert "tags" in xml_tags, str(list(xml_tags))

    expected_tags = json.loads(expected_tags_json_list)
    actual_tags = set(t.attrib["name"] for t in xml_tree.find("tags"))
    assert actual_tags == set(expected_tags), [actual_tags, set(expected_tags)]