"""
Test all things related to the ``jedi.cache`` module.
"""

import time

import pytest

import jedi
from jedi import settings, cache
from jedi.cache import ParserCacheItem, ParserPickling


ParserPicklingCls = type(ParserPickling)
ParserPickling = ParserPicklingCls()


def test_modulepickling_change_cache_dir(monkeypatch, tmpdir):
    """
    ParserPickling should not save old cache when cache_directory is changed.

    See: `#168 <https://github.com/davidhalter/jedi/pull/168>`_
    """
    dir_1 = str(tmpdir.mkdir('first'))
    dir_2 = str(tmpdir.mkdir('second'))

    item_1 = ParserCacheItem('fake parser 1')
    item_2 = ParserCacheItem('fake parser 2')
    path_1 = 'fake path 1'
    path_2 = 'fake path 2'

    monkeypatch.setattr(settings, 'cache_directory', dir_1)
    ParserPickling.save_parser(path_1, item_1)
    cached = load_stored_item(ParserPickling, path_1, item_1)
    assert cached == item_1.parser

    monkeypatch.setattr(settings, 'cache_directory', dir_2)
    ParserPickling.save_parser(path_2, item_2)
    cached = load_stored_item(ParserPickling, path_1, item_1)
    assert cached is None


def load_stored_item(cache, path, item):
    """Load `item` stored at `path` in `cache`."""
    return cache.load_parser(path, item.change_time - 1)


@pytest.mark.usefixtures("isolated_jedi_cache")
def test_modulepickling_delete_incompatible_cache():
    item = ParserCacheItem('fake parser')
    path = 'fake path'

    cache1 = ParserPicklingCls()
    cache1.version = 1
    cache1.save_parser(path, item)
    cached1 = load_stored_item(cache1, path, item)
    assert cached1 == item.parser

    cache2 = ParserPicklingCls()
    cache2.version = 2
    cached2 = load_stored_item(cache2, path, item)
    assert cached2 is None


def test_star_import_cache_duration():
    new = 0.01
    old, jedi.settings.star_import_cache_validity = \
        jedi.settings.star_import_cache_validity, new

    cache._star_import_cache = {}  # first empty...
    # path needs to be not-None (otherwise caching effects are not visible)
    jedi.Script('', 1, 0, '').completions()
    time.sleep(2 * new)
    jedi.Script('', 1, 0, '').completions()

    # reset values
    jedi.settings.star_import_cache_validity = old
    assert len(cache._star_import_cache) == 1
    cache._star_import_cache = {}


def test_cache_call_signatures():
    """
    See github issue #390.
    """
    def check(column, call_name, path=None):
        assert jedi.Script(s, 1, column, path).call_signatures()[0].name == call_name

    s = 'str(int())'

    for i in range(3):
        check(8, 'int')
        check(4, 'str')
        # Can keep doing these calls and always get the right result.

    # Now lets specify a source_path of boo and alternate these calls, it
    # should still work.
    for i in range(3):
        check(8, 'int', 'boo')
        check(4, 'str', 'boo')


def test_cache_line_split_issues():
    """Should still work even if there's a newline."""
    assert jedi.Script('int(\n').call_signatures()[0].name == 'int'
