from os import listdir, mkdir, readlink
from os.path import join, isdir, isfile, islink
from shutil import rmtree
from pytest import fixture, mark
from lxml.etree import parse
from tiramisu import Config

from rougail import RougailConfig, RougailSystemdTemplate


template_dirs = 'tests/dictionaries'
excludes = set([])
#excludes = set(['01base_file_utfchar'])
test_ok = {f for f in listdir(template_dirs) if not f.startswith('_') and isdir(join(template_dirs, f, 'tmpl'))}
test_ok -= excludes
test_ok = list(test_ok)
test_ok.sort()
#test_ok = ['20override']


@fixture(scope="module", params=test_ok)
def test_dir(request):
    return request.param


def find_files(dirname: str,
               root: list,
               files: set,
               ) -> None:
    for filename in listdir(dirname):
        abs_dirname = join(dirname, filename)
        root_file = root + [filename]
        if isdir(join(dirname, filename)):
            find_files(abs_dirname,
                       root_file,
                       files,
                       )
        else:
            files.add(join(*root_file))


@mark.asyncio
async def test_dictionary(test_dir):
    test_dir = join(template_dirs, test_dir)
    tmp_dir = join(test_dir, 'tmp')

    modulepath = test_dir.replace('/', '.') + '.tiramisu.base'
    mod = __import__(modulepath)
    for token in modulepath.split(".")[1:]:
        mod = getattr(mod, token)
    config = await Config(mod.option_0)
    await config.property.read_only()
    
    funcs_file = join(template_dirs, '../eosfunc/test.py')
    distrib_dir = join(test_dir, 'tmpl')
    if isdir(tmp_dir):
        rmtree(tmp_dir)
    mkdir(tmp_dir)
    dest_dir = join(test_dir, 'dest')
    if isdir(dest_dir):
        rmtree(dest_dir)
    mkdir(dest_dir)
    RougailConfig['patches_dir'] = join(test_dir, 'patches')
    RougailConfig['templates_dir'] = distrib_dir
    RougailConfig['tmp_dir'] = tmp_dir
    RougailConfig['functions_file'] = funcs_file
    RougailConfig['destinations_dir'] = dest_dir
    engine = RougailSystemdTemplate(config)
    await engine.instance_files()
    list_templates = set()
    if isdir(dest_dir):
        find_files(dest_dir,
                   [],
                   list_templates,
                   )
    list_results = set()
    if isdir(join(test_dir, 'result')):
        find_files(join(test_dir, 'result'),
                   [],
                   list_results,
                   )
    assert list_templates == list_results
    for result in list_results:
        template_file = join(dest_dir, result)
        assert islink(template_file) == islink(join(test_dir, 'result', result))
        if islink(template_file):
            assert readlink(template_file) == readlink(join(test_dir, 'result', result))
            continue
        if not isfile(template_file):
            raise Exception(f'{template_file} is not generated')
        with open(join(test_dir, 'result', result), 'r') as fh:
            result_file = fh.read()
        with open(template_file, 'r') as fh:
            generated_file = fh.read()
        assert result_file == generated_file, f'{template_file} content : \n{generated_file}\nexpected: \nresult_file\n'
    rmtree(dest_dir)
    rmtree(tmp_dir)