import contextlib
from pathlib import Path
from importlib import import_module
from numpy import VisibleDeprecationWarning
import pytest
import ase

# This test imports modules.
#
# This test exists because we don't want those modules at the bottom
# of the coverage ranking distracting us from real issues, and because
# importing them is at least slightly better than just ignoring them
# in the coverage stats.
#
# Some modules get 100% coverage because of this, while others
# will still have low coverage.  That's okay.


def filenames2modules(filenames):
    modules = []
    for filename in filenames:
        filename = Path(filename).as_posix()
        module = filename.rsplit('.', 1)[0]
        module = module.replace('/', '.')
        if module == 'ase.data.tmxr200x':
            continue
        modules.append(module)
        print(module)
    return modules


def glob_modules():
    topdir = Path(ase.__file__).parent
    for path in topdir.rglob('*.py'):
        path = 'ase' / path.relative_to(topdir)
        if path.name.startswith('__'):
            continue
        if path.parts[1] == 'test':
            continue
        yield path


all_modules = filenames2modules(glob_modules())

deprecated_modules = {'ase.dft.band_structure'}

ignore_imports = {
    'flask', 'psycopg2', 'kimpy', 'pymysql', 'IPython',
    'docutils',
    'gpaw',  # ase.vibrations.placzek
    'gpaw.lrtddft',  # ase.vibrations.placzek
}

newpy_only_modules = {
    'ase.utils.build_web_page'
}


@pytest.mark.filterwarnings('ignore:Moved to')
def test_imports():
    for module in all_modules:
        with contextlib.ExitStack() as ignored_warnings:
            if module in deprecated_modules:
                ignored_warnings.enter_context(
                    pytest.warns((DeprecationWarning,
                                  VisibleDeprecationWarning)))

            try:
                import_module(module)
            except SyntaxError:
                if module not in newpy_only_modules:
                    raise
            except ImportError as err:
                ok = err.name in ignore_imports or 'deprecated' in str(err)
                if not ok:
                    raise