import copy
import os
import re
import subprocess


REWRITE = os.getenv('FIXTURE_REWRITE') or os.getenv('TEST_REWRITE')


def autotest(path, cmd, ignore=None, env=None):
    """
    The autowriting test pattern, minimal for testing cli2 scripts.

    Example:

        cli2.autotest(
            'tests/djcli_save_user.txt',
            'djcli save auth.User username="test"',
        )
    """
    environ = copy.copy(os.environ)
    if env:
        for key, value in env.items():
            environ[key] = value
    environ['FORCE_TERMSIZE'] = '1'
    environ['PATH'] = ':'.join([
        environ.get('HOME', '') + '/.local/bin',
        environ.get('PATH', '')
    ])

    proc = subprocess.run(
        cmd,
        shell=True,
        capture_output=True,
        env=environ,
    )

    fixture = '\n'.join([
        'command: ' + cmd,
        'retcode: ' + str(proc.returncode),
        'stdout:',
        proc.stdout.decode('utf8'),
    ])
    if proc.stderr:
        fixture += '\n'.join([
            'stderr:',
            proc.stderr.decode('utf8'),
        ])

    for r in ignore or []:
        fixture = re.compile(r).sub(f'redacted', fixture)

    exists = os.path.exists(path)
    if REWRITE and exists:
        os.unlink(path)
        exists = False

    if not exists:
        # dirname = '/'.join(path.split('/')[:-1])
        dirname = os.path.dirname(path)
        if not os.path.exists(dirname):
            os.makedirs(dirname)

        with open(path, 'w+') as f:
            f.write(fixture)

        if REWRITE:
            return

        raise type('FixtureCreated', (Exception,), {})(
            f'''
{path} was not in workdir and was created with:
{fixture}
            '''.strip(),
        )

    diff_cmd = 'diff -U 1 - "%s" | sed "1,2 d"' % path
    proc = subprocess.Popen(
        diff_cmd,
        stdout=subprocess.PIPE,
        stdin=subprocess.PIPE,
        stderr=subprocess.STDOUT,
        shell=True
    )

    diff_out, diff_err = proc.communicate(input=fixture.encode('utf8'))
    if diff_out:
        raise type(f'''
DiffFound
- {cmd}
+ {path}
        '''.strip(), (Exception,), {})('\n' + diff_out.decode('utf8'))
