import os
import requests
import tarfile
import tempfile
import shutil
from git import Repo
from os import path

from ..exceptions import source_exceptions

def git_clone(repo_url, branch='master'):
    '''
    :params repo_url - URL of git repo to clone
    :params branch - branch of the repo to clone

    Returns a path to the cloned repo
    '''

    if repo_url == '':
        raise source_exceptions.GitLocationException(repo_url)

    os.environ['GIT_TERMINAL_PROMPT'] = '0'
    _tmp_dir = tempfile.mkdtemp(prefix='armada', dir='/tmp')

    try:
        Repo.clone_from(repo_url, _tmp_dir, **{'branch': branch})
    except Exception:
        raise source_exceptions.GitLocationException(repo_url)

    return _tmp_dir

def get_tarball(tarball_url):
    tarball_path = download_tarball(tarball_url)
    return extract_tarball(tarball_path)

def download_tarball(tarball_url):
    '''
    Downloads a tarball to /tmp and returns the path
    '''
    try:
        tarball_filename = tempfile.mkstemp(prefix='armada', dir='/tmp')[1]
        response = requests.get(tarball_url)
        with open(tarball_filename, 'wb') as f:
            f.write(response.content)
    except Exception:
        raise source_exceptions.TarballDownloadException(tarball_url)
    return tarball_filename

def extract_tarball(tarball_path):
    '''
    Extracts a tarball to /tmp and returns the path
    '''
    if not path.exists(tarball_path):
        raise source_exceptions.InvalidPathException(tarball_path)

    _tmp_dir = tempfile.mkdtemp(prefix='armada', dir='/tmp')

    try:
        file = tarfile.open(tarball_path)
        file.extractall(_tmp_dir)
    except Exception:
        raise source_exceptions.TarballExtractException(tarball_path)
    return _tmp_dir

def source_cleanup(target_dir):
    '''
    Clean up source
    '''
    if path.exists(target_dir):
        shutil.rmtree(target_dir)