"""
Mapper tests.
"""


#
# Fimfarchive, preserves stories from Fimfiction.
# Copyright (C) 2018  Joakim Soderlund
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
#


import os
from typing import no_type_check, Dict, Any
from unittest.mock import patch, MagicMock, PropertyMock

import pytest

from fimfarchive.exceptions import InvalidStoryError
from fimfarchive.flavors import DataFormat, MetaFormat
from fimfarchive.mappers import (
    MetaFormatMapper, StaticMapper, StoryDateMapper,
    StoryPathMapper, StorySlugMapper
)
from fimfarchive.stories import Story


CHAPTERS = 'chapters'
MODIFIED = 'date_modified'


class TestStaticMapper:
    """
    StaticMapper tests.
    """

    @pytest.fixture
    def value(self):
        """
        Returns a unique instance.
        """
        return object()

    def test_value(self, story, value):
        """
        Tests returns the supplied value.
        """
        mapper = StaticMapper(value)
        assert mapper(story) is value


class TestStoryDateMapper:
    """
    StoryDateMapper tests.
    """

    @pytest.fixture
    def mapper(self):
        """
        Returns a new StoryDateMapper.
        """
        return StoryDateMapper()

    def merge(self, story, meta):
        """
        Returns a cloned story containing the supplied meta.
        """
        return Story(
            key=story.key,
            fetcher=None,
            meta=meta,
            data=story.data,
            flavors=story.flavors,
        )

    def test_missing_story(self, mapper):
        """
        Tests `None` is returned when story is `None`.
        """
        assert mapper(None) is None

    def test_invalid_story(self, mapper, story):
        """
        Tests `None` is returned when `InvalidStoryError` is raised.
        """
        with patch.object(Story, 'meta', new_callable=PropertyMock) as m:
            m.side_effect = InvalidStoryError

            assert mapper(story) is None
            assert m.called_once_with(story)

    def test_empty_meta(self, mapper, story):
        """
        Tests `None` is returned when meta is empty.
        """
        story = story.merge(meta=dict())

        assert mapper(story) is None

    def test_meta_without_dates(self, mapper, story):
        """
        Tests `None` is returned when meta contains no dates.
        """
        meta: Dict[str, Any] = {
            CHAPTERS: [
                dict(),
                dict(),
                dict(),
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story) is None

    def test_meta_without_chapters(self, mapper, story):
        """
        Tests timestamp is returned when no chapters are present.
        """
        meta = {
            MODIFIED: 5,
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_none_chapters(self, mapper, story):
        """
        Tests timestamp is returned when chapters is `None`.
        """
        meta = {
            MODIFIED: 5,
            CHAPTERS: None,
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_empty_chapters(self, mapper, story):
        """
        Tests timestamp is returned when chapters is empty.
        """
        meta = {
            MODIFIED: 5,
            CHAPTERS: [],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_only_chapter_dates(self, mapper, story):
        """
        Tests timestamp is returned when only chapter dates are present.
        """
        meta = {
            CHAPTERS: [
                {MODIFIED: 3},
                {MODIFIED: 5},
                {MODIFIED: 4},
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_only_story_date(self, mapper, story):
        """
        Tests timestamp is returned when only story date is present.
        """
        meta = {
            MODIFIED: 5,
            CHAPTERS: [
                dict(),
                dict(),
                dict(),
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_latest_chapter_date(self, mapper, story):
        """
        Tests latests timestamp is returned when in chapter dates.
        """
        meta = {
            MODIFIED: 3,
            CHAPTERS: [
                {MODIFIED: 1},
                {MODIFIED: 5},
                {MODIFIED: 3},
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_latest_story_date(self, mapper, story):
        """
        Tests latest timestamp is returned when in story date.
        """
        meta = {
            MODIFIED: 5,
            CHAPTERS: [
                {MODIFIED: 1},
                {MODIFIED: 3},
                {MODIFIED: 2},
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5

    def test_meta_with_both_latest(self, mapper, story):
        """
        Tests latest timestamp is returned when in both.
        """
        meta = {
            MODIFIED: 5,
            CHAPTERS: [
                {MODIFIED: 1},
                {MODIFIED: 5},
                {MODIFIED: 3},
            ],
        }

        story = story.merge(meta=meta)

        assert mapper(story).timestamp == 5


class TestStoryPathMapper:
    """
    StoryPathMapper tests.
    """

    def test_joins_paths(self, story):
        """
        Tests returns directory joined with story key.
        """
        directory = os.path.join('some', 'directory')
        path = os.path.join(directory, str(story.key))

        mapper = StoryPathMapper(directory)

        assert mapper(story) == path

    @no_type_check
    def test_casts_values(self, tmpdir, story):
        """
        Tests casts all values to string when joining.
        """
        directory = MagicMock()
        directory.__str__.return_value = 'dir'

        story.key = MagicMock()
        story.key.__str__.return_value = 'key'

        mapper = StoryPathMapper(directory)

        assert mapper(story) == os.path.join('dir', 'key')
        assert directory.__str__.called_once_with()
        assert story.key.__str__.called_once_with()


class TestStorySlugMapper:
    """
    StorySlugMapper tests.
    """

    @pytest.fixture
    def mapper(self) -> StorySlugMapper:
        """
        Returns a mapper instance.
        """
        return StorySlugMapper()

    @pytest.fixture
    def story(self, story: Story) -> Story:
        """
        Returns a story instance.
        """
        meta = {
            'id': 1337,
            'title': 'title',
            'author': {
                'id': 42,
                'name': 'name',
            },
        }

        return story.merge(
            meta=meta,
            flavors=[DataFormat.EPUB]
        )

    def test_mapping(self, mapper, story):
        """
        Tests a simple slug mapping.
        """
        assert mapper(story) == 'epub/n/name-42/title-1337.epub'

    def test_custom_mapping(self, story):
        """
        Tests a slug mapping with a custom template.
        """
        mapper = StorySlugMapper('{story}.{extension}')

        assert mapper(story) == 'title-1337.epub'

    @pytest.mark.parametrize('text,result', (
        ('Project Sunflower: Harmony', 'project_sunflower_harmony'),
        ('The Enchanted Library', 'the_enchanted_library'),
        ('Hurricane\'s Way', 'hurricanes_way'),
        ('Sharers\' Day', 'sharers_day'),
        ('Paca ' * 32, ('paca_' * 22)[:-1]),
        ('Paca' * 32, ''),
        (None, 'none'),
        ('  ', ''),
        (' ', ''),
        ('', ''),
    ))
    def test_slugify(self, mapper, text, result):
        """
        Tests creating a slug for a title.
        """
        assert mapper.slugify(text) == result

    @pytest.mark.parametrize('key,slug,result', (
        (16, 'slug', 'slug-16'),
        (32, None, '32'),
        (64, '', '64'),
    ))
    def test_join(self, mapper, key, slug, result):
        """
        Tests joining a slug with a key.
        """
        assert mapper.join(key, slug) == result

    def test_join_with_negative_key(self, mapper):
        """
        Tests `ValueError` is raised when joining a negative key.
        """
        with pytest.raises(ValueError):
            mapper.join('-1', 'slug')

    @pytest.mark.parametrize('slug,result', (
        ('alpaca', 'a'),
        ('pony', 'p'),
        ('42', '_'),
        ('  ', '_'),
        (' ', '_'),
        ('', '_'),
    ))
    def test_group(self, mapper, slug, result):
        """
        Tests grouping of a slug.
        """
        assert mapper.group(slug) == result

    @pytest.mark.parametrize('flavors,result', (
        ({MetaFormat.BETA, DataFormat.EPUB}, 'epub'),
        ({DataFormat.EPUB}, 'epub'),
        ({DataFormat.HTML}, 'html'),
        ({MetaFormat.BETA}, 'data'),
        ({}, 'data'),
    ))
    def test_classify(self, mapper, story, flavors, result):
        """
        Tests classify with a story.
        """
        story = story.merge(flavors=flavors)

        assert mapper.classify(story) == result

    def test_map_with_long_template(self, story):
        """
        Tests `ValueError` is raised when result is too long.
        """
        mapper = StorySlugMapper('paca' * 256)

        with pytest.raises(ValueError):
            mapper(story)


class TestMetaFormatMapper:
    """
    MetaFormatMapper tests.
    """

    @pytest.fixture
    def mapper(self):
        """
        Returns a meta format mapper instance.
        """
        return MetaFormatMapper()

    @pytest.fixture(params=['likes', 'dislikes', 'words'])
    def alpha(self, request):
        """
        Returns an alpha meta key.
        """
        return request.param

    @pytest.fixture(params=['num_likes', 'num_dislikes', 'num_words'])
    def beta(self, request):
        """
        Returns a beta meta key.
        """
        return request.param

    def merge(self, story, *keys):
        """
        Returns a story containing the requested meta keys.
        """
        meta = {key: i for i, key in enumerate(keys, 1)}
        return story.merge(meta=meta)

    def test_alpha_format(self, mapper, story, alpha):
        """
        Tests alpha meta format is detected.
        """
        story = self.merge(story, alpha, 'misc')
        assert mapper(story) == MetaFormat.ALPHA

    def test_beta_format(self, mapper, story, beta):
        """
        Tests beta meta format is detected.
        """
        story = self.merge(story, beta, 'misc')
        assert mapper(story) == MetaFormat.BETA

    def test_conflict(self, mapper, story, alpha, beta):
        """
        Tests None is returned for conflicting meta keys.
        """
        story = self.merge(story, alpha, beta)
        assert mapper(story) is None

    def test_existing_flavor(self, mapper, story, beta):
        """
        Tests existing flavor takes precedence over meta.
        """
        story = story.merge(flavors=[MetaFormat.ALPHA])
        story = self.merge(story, beta, 'misc')

        assert mapper(story) is MetaFormat.ALPHA