import os
import shutil
import curses
from collections import OrderedDict
from contextlib import contextmanager
from tempfile import mkdtemp, NamedTemporaryFile

import pytest

from tuir.theme import Theme
from tuir.config import Config
from tuir.exceptions import ConfigError

try:
    from unittest import mock
except ImportError:
    import mock


INVALID_ELEMENTS = OrderedDict([
    ('too_few_items', 'Upvote = blue\n'),
    ('too_many_items', 'Upvote = blue blue bold underline\n'),
    ('invalid_fg', 'Upvote = invalid blue\n'),
    ('invalid_bg', 'Upvote = blue invalid\n'),
    ('invalid_attr', 'Upvote = blue blue bold+invalid\n'),
    ('invalid_hex', 'Upvote = #fffff blue\n'),
    ('invalid_hex2', 'Upvote = #gggggg blue\n'),
    ('out_of_range', 'Upvote = ansi_256 blue\n'),
    ('something_invalid', 'non_existing_key_without_value\n')
])


@contextmanager
def _ephemeral_directory():
    # All of the temporary files for the theme tests must
    # be initialized in separate directories, so the tests
    # can run in parallel without accidentally loading theme
    # files from each other
    dirname = None
    try:
        dirname = mkdtemp()
        yield dirname
    finally:
        if dirname:
            shutil.rmtree(dirname, ignore_errors=True)


def test_theme_invalid_source():

    with pytest.raises(ValueError):
        Theme(name='default', source=None)
    with pytest.raises(ValueError):
        Theme(name=None, source='installed')


def test_theme_default_construct():

    theme = Theme()
    assert theme.name == 'default'
    assert theme.source == 'built-in'
    assert theme.required_colors == 8
    assert theme.required_color_pairs == 6
    for fg, bg, attr in theme.elements.values():
        assert isinstance(fg, int)
        assert isinstance(bg, int)
        assert isinstance(attr, int)


def test_theme_monochrome_construct():

    theme = Theme(use_color=False)
    assert theme.name == 'monochrome'
    assert theme.source == 'built-in'
    assert theme.required_colors == 0
    assert theme.required_color_pairs == 0


def test_theme_256_construct():

    elements = {'CursorBar1': (None, 101, curses.A_UNDERLINE)}
    theme = Theme(elements=elements)
    assert theme.elements['CursorBar1'] == (-1, 101, curses.A_UNDERLINE)
    assert theme.required_colors == 256


def test_theme_element_selected_attributes():

    elements = {
        'Normal':   (1,    2,    curses.A_REVERSE),
        'Selected': (2,    3,    None),
        'TitleBar': (4,    None, curses.A_BOLD),
        'Link':     (5,    None, None)}

    theme = Theme(elements=elements)
    assert theme.elements['Normal'] == (1, 2, curses.A_REVERSE)

    # All of the normal elements fallback to the attributes of "Normal"
    assert theme.elements['Selected'] == (2, 3, curses.A_REVERSE)
    assert theme.elements['TitleBar'] == (4, 2, curses.A_BOLD)
    assert theme.elements['Link'] == (5, 2, curses.A_REVERSE)

    # The @Selected mode will overwrite any other attributes with
    # the ones defined in "Selected". Because "Selected" defines
    # a foreground and a background color, they will override the
    # ones that "Link" had defined.
    # assert theme.elements['@Link'] == (2, 3, curses.A_REVERSE)

    # I can't remember why the above rule was implemented, so I reverted it
    assert theme.elements['@Link'] == (5, 3, curses.A_REVERSE)

    assert '@Normal' not in theme.elements
    assert '@Selected' not in theme.elements
    assert '@TitleBar' not in theme.elements


def test_theme_default_cfg_matches_builtin():

    filename = os.path.join(Config.DEFAULT_THEMES, 'default.cfg.example')
    default_theme = Theme.from_file(filename, 'built-in')

    # The default theme file should match the hardcoded values
    assert default_theme.elements == Theme().elements

    # Make sure that the elements passed into the constructor exactly match
    # up with the hardcoded elements
    class MockTheme(Theme):
        def __init__(self, name=None, source=None, elements=None):
            assert name == 'default.cfg'
            assert source == 'preset'
            assert elements == Theme.DEFAULT_ELEMENTS

    MockTheme.from_file(filename, 'preset')


args, ids = INVALID_ELEMENTS.values(), list(INVALID_ELEMENTS)
@pytest.mark.parametrize('line', args, ids=ids)
def test_theme_from_file_invalid(line):

    with _ephemeral_directory() as dirname:
        with NamedTemporaryFile(mode='w+', dir=dirname) as fp:
            fp.write('[theme]\n')
            fp.write(line)
            fp.flush()
            with pytest.raises(ConfigError):
                Theme.from_file(fp.name, 'installed')


def test_theme_from_file():

    with _ephemeral_directory() as dirname:
        with NamedTemporaryFile(mode='w+', dir=dirname) as fp:

            with pytest.raises(ConfigError):
                Theme.from_file(fp.name, 'installed')

            fp.write('[theme]\n')
            fp.write('Unknown = - -\n')
            fp.write('Upvote = - red\n')
            fp.write('Downvote = ansi_255 default bold\n')
            fp.write('NeutralVote = #000000 #ffffff bold+reverse\n')
            fp.flush()

            theme = Theme.from_file(fp.name, 'installed')
            assert theme.source == 'installed'
            assert 'Unknown' not in theme.elements
            assert theme.elements['Upvote'] == (
                -1, curses.COLOR_RED, curses.A_NORMAL)
            assert theme.elements['Downvote'] == (
                255, -1, curses.A_BOLD)
            assert theme.elements['NeutralVote'] == (
                16, 231, curses.A_BOLD | curses.A_REVERSE)


def test_theme_from_name():

    with _ephemeral_directory() as dirname:
        with NamedTemporaryFile(mode='w+', suffix='.cfg', dir=dirname) as fp:
            path, filename = os.path.split(fp.name)
            theme_name = filename[:-4]

            fp.write('[theme]\n')
            fp.write('Upvote = default default\n')
            fp.flush()

            # Full file path
            theme = Theme.from_name(fp.name, path=path)
            assert theme.name == theme_name
            assert theme.source == 'custom'
            assert theme.elements['Upvote'] == (-1, -1, curses.A_NORMAL)

            # Relative to the directory
            theme = Theme.from_name(theme_name, path=path)
            assert theme.name == theme_name
            assert theme.source == 'installed'
            assert theme.elements['Upvote'] == (-1, -1, curses.A_NORMAL)

            # Invalid theme name
            with pytest.raises(ConfigError):
                theme.from_name('invalid_theme_name', path=path)


def test_theme_initialize_attributes(stdscr):

    theme = Theme()
    with pytest.raises(RuntimeError):
        theme.get('Upvote')

    theme.bind_curses()
    assert len(theme._color_pair_map) == theme.required_color_pairs
    for element in Theme.DEFAULT_ELEMENTS:
        assert isinstance(theme.get(element), int)

    theme = Theme(use_color=False)
    theme.bind_curses()


def test_theme_initialize_attributes_monochrome(stdscr):

    theme = Theme(use_color=False)
    theme.bind_curses()
    theme.get('Upvote')

    # Avoid making these curses calls if colors aren't initialized
    assert not curses.init_pair.called
    assert not curses.color_pair.called


def test_theme_list_themes():

    with _ephemeral_directory() as dirname:
        with NamedTemporaryFile(mode='w+', suffix='.cfg', dir=dirname) as fp:
            path, filename = os.path.split(fp.name)
            theme_name = filename[:-4]

            fp.write('[theme]\n')
            fp.flush()

            Theme.print_themes(path)
            themes, errors = Theme.list_themes(path)
            assert not errors

            theme_strings = [t.display_string for t in themes]
            assert theme_name + ' (installed)' in theme_strings
            assert 'default (built-in)' in theme_strings
            assert 'monochrome (built-in)' in theme_strings
            assert 'molokai (preset)' in theme_strings


def test_theme_list_themes_invalid():

    with _ephemeral_directory() as dirname:
        with NamedTemporaryFile(mode='w+', suffix='.cfg', dir=dirname) as fp:
            path, filename = os.path.split(fp.name)
            theme_name = filename[:-4]

            fp.write('[theme]\n')
            fp.write('Upvote = invalid value\n')
            fp.flush()

            Theme.print_themes(path)
            themes, errors = Theme.list_themes(path)
            assert ('installed', theme_name) in errors


def test_theme_presets_define_all_elements():

    # The themes in the preset themes/ folder should have all of the valid
    # elements defined in their configuration.
    class MockTheme(Theme):

        def __init__(self, name=None, source=None, elements=None, use_color=True):
            if source == 'preset':
                assert set(elements.keys()) == set(Theme.DEFAULT_ELEMENTS.keys())
            super(MockTheme, self).__init__(name, source, elements, use_color)

    themes, errors = MockTheme.list_themes()
    assert sum([theme.source == 'preset' for theme in themes]) >= 4