"""Testing Utilities

This module holds values/functions common to multiple tests.
"""

import re
import os

ALT_FILE1 = 'test_alt'
ALT_FILE2 = 'test alt/test alt'
ALT_DIR = 'test alt/test alt dir'

# Directory based alternates must have a tracked contained file.
# This will be the test contained file name
CONTAINED = 'contained_file'

# These variables are used for making include files which will be processed
# within jinja templates
INCLUDE_FILE = 'inc_file'
INCLUDE_DIRS = ['', 'test alt']
INCLUDE_CONTENT = '8780846c02e34c930d0afd127906668f'


def set_local(paths, variable, value):
    """Set local override"""
    os.system(
        f'GIT_DIR={str(paths.repo)} '
        f'git config --local "local.{variable}" "{value}"'
    )


def create_alt_files(paths, suffix,
                     preserve=False, tracked=True,
                     encrypt=False, exclude=False,
                     content=None, includefile=False,
                     yadm_alt=False, yadm_dir=None):
    """Create new files, and add to the repo

    This is used for testing alternate files. In each case, a suffix is
    appended to two standard file paths. Particulars of the file creation and
    repo handling are dependent upon the function arguments.
    """

    basepath = yadm_dir.join('alt') if yadm_alt else paths.work

    if not preserve:
        for remove_path in (ALT_FILE1, ALT_FILE2, ALT_DIR):
            if basepath.join(remove_path).exists():
                basepath.join(remove_path).remove(rec=1, ignore_errors=True)
                assert not basepath.join(remove_path).exists()

    new_file1 = basepath.join(ALT_FILE1 + suffix)
    new_file1.write(ALT_FILE1 + suffix, ensure=True)
    new_file2 = basepath.join(ALT_FILE2 + suffix)
    new_file2.write(ALT_FILE2 + suffix, ensure=True)
    new_dir = basepath.join(ALT_DIR + suffix).join(CONTAINED)
    new_dir.write(ALT_DIR + suffix, ensure=True)

    # Do not test directory support for jinja alternates
    test_paths = [new_file1, new_file2]
    test_names = [ALT_FILE1, ALT_FILE2]
    if not re.match(r'##(t$|t\.|template|yadm)', suffix):
        test_paths += [new_dir]
        test_names += [ALT_DIR]

    for test_path in test_paths:
        if content:
            test_path.write('\n' + content, mode='a', ensure=True)
        assert test_path.exists()

    _create_includefiles(includefile, test_paths, basepath)
    _create_tracked(tracked, test_paths, paths)

    prefix = '.config/yadm/alt/' if yadm_alt else ''
    _create_encrypt(encrypt, test_names, suffix, paths, exclude, prefix)


def parse_alt_output(output, linked=True):
    """Parse output of 'alt', and return list of linked files"""
    regex = r'Creating (.+) from template (.+)$'
    if linked:
        regex = r'Linking (.+) to (.+)$'
    parsed_list = dict()
    for line in output.splitlines():
        match = re.match(regex, line)
        if match:
            if linked:
                parsed_list[match.group(2)] = match.group(1)
            else:
                parsed_list[match.group(1)] = match.group(2)
    return parsed_list.values()


def _create_includefiles(includefile, test_paths, basepath):
    if includefile:
        for dpath in INCLUDE_DIRS:
            incfile = basepath.join(dpath + '/' + INCLUDE_FILE)
            incfile.write(INCLUDE_CONTENT, ensure=True)
            test_paths += [incfile]


def _create_tracked(tracked, test_paths, paths):
    if tracked:
        for track_path in test_paths:
            os.system(f'GIT_DIR={str(paths.repo)} git add "{track_path}"')
        os.system(f'GIT_DIR={str(paths.repo)} git commit -m "Add test files"')


def _create_encrypt(encrypt, test_names, suffix, paths, exclude, prefix):
    if encrypt:
        for encrypt_name in test_names:
            paths.encrypt.write(
                f'{prefix + encrypt_name + suffix}\n', mode='a')
            if exclude:
                paths.encrypt.write(
                    f'!{prefix + encrypt_name + suffix}\n', mode='a')