"""Verify generate context behaviour and context overwrite priorities."""
import os
import re
from collections import OrderedDict

import pytest

from cookiecutter import generate
from cookiecutter.exceptions import ContextDecodingException


def context_data():
    """Generate pytest parametrization variables for test.

    Return ('input_params, expected_context') tuples.
    """
    context = (
        {'context_file': 'tests/test-generate-context/test.json'},
        {'test': {'1': 2, 'some_key': 'some_val'}},
    )

    context_with_default = (
        {
            'context_file': 'tests/test-generate-context/test.json',
            'default_context': {'1': 3},
        },
        {'test': {'1': 3, 'some_key': 'some_val'}},
    )

    context_with_extra = (
        {
            'context_file': 'tests/test-generate-context/test.json',
            'extra_context': {'1': 4},
        },
        {'test': {'1': 4, 'some_key': 'some_val'}},
    )

    context_with_default_and_extra = (
        {
            'context_file': 'tests/test-generate-context/test.json',
            'default_context': {'1': 3},
            'extra_context': {'1': 5},
        },
        {'test': {'1': 5, 'some_key': 'some_val'}},
    )

    yield context
    yield context_with_default
    yield context_with_extra
    yield context_with_default_and_extra


@pytest.mark.usefixtures('clean_system')
@pytest.mark.parametrize('input_params, expected_context', context_data())
def test_generate_context(input_params, expected_context):
    """Verify input contexts combinations result in expected content on output."""
    assert generate.generate_context(**input_params) == expected_context


@pytest.mark.usefixtures('clean_system')
def test_generate_context_with_json_decoding_error():
    """Verify malformed JSON file generates expected error output."""
    with pytest.raises(ContextDecodingException) as excinfo:
        generate.generate_context('tests/test-generate-context/invalid-syntax.json')
    # original message from json module should be included
    pattern = 'Expecting \'{0,1}:\'{0,1} delimiter: line 1 column (19|20) \\(char 19\\)'
    assert re.search(pattern, str(excinfo.value))
    # File name should be included too...for testing purposes, just test the
    # last part of the file. If we wanted to test the absolute path, we'd have
    # to do some additional work in the test which doesn't seem that needed at
    # this point.
    path = os.path.sep.join(['tests', 'test-generate-context', 'invalid-syntax.json'])
    assert path in str(excinfo.value)


def test_default_context_replacement_in_generate_context():
    """Verify default content settings are correctly replaced by template settings.

    Make sure that the default for list variables of `orientation` is based on
    the user config (`choices_template.json`) and not changed to a single value
    from `default_context`.
    """
    expected_context = {
        'choices_template': OrderedDict(
            [
                ('full_name', 'Raphael Pierzina'),
                ('github_username', 'hackebrot'),
                ('project_name', 'Kivy Project'),
                ('repo_name', '{{cookiecutter.project_name|lower}}'),
                ('orientation', ['landscape', 'all', 'portrait']),
            ]
        )
    }

    generated_context = generate.generate_context(
        context_file='tests/test-generate-context/choices_template.json',
        default_context={
            'not_in_template': 'foobar',
            'project_name': 'Kivy Project',
            'orientation': 'landscape',
        },
        extra_context={
            'also_not_in_template': 'foobar2',
            'github_username': 'hackebrot',
        },
    )

    assert generated_context == expected_context


def test_generate_context_decodes_non_ascii_chars():
    """Verify `generate_context` correctly decodes non-ascii chars."""
    expected_context = {
        'non_ascii': OrderedDict(
            [
                ('full_name', 'éèà'),
            ]
        )
    }

    generated_context = generate.generate_context(
        context_file='tests/test-generate-context/non_ascii.json'
    )

    assert generated_context == expected_context


@pytest.fixture
def template_context():
    """Fixture. Populates template content for future tests."""
    return OrderedDict(
        [
            ('full_name', 'Raphael Pierzina'),
            ('github_username', 'hackebrot'),
            ('project_name', 'Kivy Project'),
            ('repo_name', '{{cookiecutter.project_name|lower}}'),
            ('orientation', ['all', 'landscape', 'portrait']),
            ('deployment_regions', ['eu', 'us', 'ap']),
            (
                'deployments',
                {
                    'preprod': ['eu', 'us', 'ap'],
                    'prod': ['eu', 'us', 'ap'],
                },
            ),
        ]
    )


def test_apply_overwrites_does_include_unused_variables(template_context):
    """Verify `apply_overwrites_to_context` skips variables that are not in context."""
    generate.apply_overwrites_to_context(
        context=template_context, overwrite_context={'not in template': 'foobar'}
    )

    assert 'not in template' not in template_context


def test_apply_overwrites_sets_non_list_value(template_context):
    """Verify `apply_overwrites_to_context` work with string variables."""
    generate.apply_overwrites_to_context(
        context=template_context, overwrite_context={'repo_name': 'foobar'}
    )

    assert template_context['repo_name'] == 'foobar'


def test_apply_overwrites_does_not_modify_choices_for_invalid_overwrite():
    """Verify variables overwrite for list if variable not in list ignored."""
    expected_context = {
        'choices_template': OrderedDict(
            [
                ('full_name', 'Raphael Pierzina'),
                ('github_username', 'hackebrot'),
                ('project_name', 'Kivy Project'),
                ('repo_name', '{{cookiecutter.project_name|lower}}'),
                ('orientation', ['all', 'landscape', 'portrait']),
            ]
        )
    }

    with pytest.warns(UserWarning, match="Invalid default received"):
        generated_context = generate.generate_context(
            context_file='tests/test-generate-context/choices_template.json',
            default_context={
                'not_in_template': 'foobar',
                'project_name': 'Kivy Project',
                'orientation': 'foobar',
            },
            extra_context={
                'also_not_in_template': 'foobar2',
                'github_username': 'hackebrot',
            },
        )

    assert generated_context == expected_context


def test_apply_overwrites_invalid_overwrite(template_context):
    """Verify variables overwrite for list if variable not in list not ignored."""
    with pytest.raises(ValueError):
        generate.apply_overwrites_to_context(
            context=template_context, overwrite_context={'orientation': 'foobar'}
        )


def test_apply_overwrites_sets_multichoice_values(template_context):
    """Verify variable overwrite for list given multiple valid values."""
    generate.apply_overwrites_to_context(
        context=template_context,
        overwrite_context={'deployment_regions': ['eu']},
    )
    assert template_context['deployment_regions'] == ['eu']


def test_apply_overwrites_invalid_multichoice_values(template_context):
    """Verify variable overwrite for list given invalid list entries not ignored."""
    with pytest.raises(ValueError):
        generate.apply_overwrites_to_context(
            context=template_context,
            overwrite_context={'deployment_regions': ['na']},
        )


def test_apply_overwrites_error_additional_values(template_context):
    """Verify variable overwrite for list given additional entries not ignored."""
    with pytest.raises(ValueError):
        generate.apply_overwrites_to_context(
            context=template_context,
            overwrite_context={'deployment_regions': ['eu', 'na']},
        )


def test_apply_overwrites_in_dictionaries(template_context):
    """Verify variable overwrite for lists nested in dictionary variables."""
    generate.apply_overwrites_to_context(
        context=template_context,
        overwrite_context={'deployments': {'preprod': ['eu'], 'prod': ['ap']}},
    )
    assert template_context['deployments']['preprod'] == ['eu']
    assert template_context['deployments']['prod'] == ['ap']


def test_apply_overwrites_sets_default_for_choice_variable(template_context):
    """Verify overwritten list member became a default value."""
    generate.apply_overwrites_to_context(
        context=template_context, overwrite_context={'orientation': 'landscape'}
    )

    assert template_context['orientation'] == ['landscape', 'all', 'portrait']


def test_apply_overwrites_in_nested_dict():
    """Verify nested dict in default content settings are correctly replaced."""
    expected_context = {
        'nested_dict': OrderedDict(
            [
                ('full_name', 'Raphael Pierzina'),
                ('github_username', 'hackebrot'),
                (
                    'project',
                    OrderedDict(
                        [
                            ('name', 'My Kivy Project'),
                            ('description', 'My Kivy Project'),
                            ('repo_name', '{{cookiecutter.project_name|lower}}'),
                            ('orientation', ["all", "landscape", "portrait"]),
                        ]
                    ),
                ),
            ]
        )
    }

    generated_context = generate.generate_context(
        context_file='tests/test-generate-context/nested_dict.json',
        default_context={
            'not_in_template': 'foobar',
            'project': {
                'description': 'My Kivy Project',
            },
        },
        extra_context={
            'also_not_in_template': 'foobar2',
            'github_username': 'hackebrot',
            'project': {
                'name': 'My Kivy Project',
            },
        },
    )

    assert generated_context == expected_context