import os
import subprocess
import yaml
from argparse import ArgumentParser
from jinja2 import Environment, FileSystemLoader


def render(obj, template="testplan.html", name=None):
    if name is None:
        name = template
    _env = Environment(loader=FileSystemLoader('templates'))
    _template = _env.get_template(template)
    _obj = _template.render(obj=obj)
    with open("{}".format(name), "wb") as _file:
        _file.write(_obj.encode('utf-8'))


# get list of repositories and cache them
def repository_list(testplan):
    repositories = set()
    for req in testplan['requirements']:
        if 'tests' in req.keys() and req['tests'] is not None:
            if 'manual' in req['tests'].keys() and req['tests']['manual'] is not None:
                for test in req['tests']['manual']:
                    repositories.add(test['repository'])
            if 'automated' in req['tests'].keys() and req['tests']['automated'] is not None:
                for test in req['tests']['automated']:
                    repositories.add(test['repository'])
    return repositories


def clone_repository(repository_url, base_path, ignore=False):
    path_suffix = repository_url.rsplit("/", 1)[1]
    if path_suffix.endswith(".git"):
        path_suffix = path_suffix[:-4]

    path = os.path.abspath(os.path.join(base_path, path_suffix)) 
    if os.path.exists(path) and ignore:
        return(repository_url, path)
    # git clone repository_url
    subprocess.call(['git', 'clone', repository_url, path])
    # return tuple (repository_url, system_path)
    return (repository_url, path)


def test_exists(test, repositories):
    test_file_path = os.path.join(
        repositories[test['repository']],
        test['path']
    )
    current_dir = os.getcwd()
    print current_dir
    os.chdir(repositories[test['repository']])
    if 'revision' in test.keys():
        subprocess.call(['git', 'checkout', test['revision']])
    else:
        # if no revision is specified, use current HEAD
        output = subprocess.check_output(['git', 'rev-parse', 'HEAD'])
        test['revision'] = output

    if not os.path.exists(test_file_path) or not os.path.isfile(test_file_path):
        test['missing'] = True
        os.chdir(current_dir)
        return not test['missing']
    test['missing'] = False
    # open the file and render the test
    subprocess.call(['git', 'checkout', 'master'])
    print current_dir
    os.chdir(current_dir)
    print os.getcwd()
    test_file = open(test_file_path, "r")
    test_yaml = yaml.load(test_file.read())
    params_string = ""
    if 'parameters' in test.keys():
        params_string = "_".join(["{0}-{1}".format(param_name, param_value).replace("/", "").replace(" ", "") for param_name, param_value in test['parameters'].iteritems()])
        test_yaml['params'].update(test['parameters'])
    print params_string
    test_name = "{0}_{1}.html".format(test_yaml['metadata']['name'], params_string)
    test['filename'] = test_name
    render(test_yaml, template="test.html", name=test_name)
    return not test['missing']


def check_coverage(requirement, repositories):
    requirement['covered'] = False
    if not 'tests' in requirement.keys() or requirement['tests'] is None:
        return
    if 'manual' in requirement['tests'].keys() and requirement['tests']['manual'] is not None:
        for test in requirement['tests']['manual']:
            if test_exists(test, repositories) :
                requirement['covered'] = True
    if 'automated' in requirement['tests'].keys() and requirement['tests']['automated'] is not None:
        for test in requirement['tests']['automated']:
            if test_exists(test, repositories):
                requirement['covered'] = True


def main():
    parser = ArgumentParser()
    parser.add_argument("-f",
        "--file",
        dest="testplan",
        required=True,
        help="Test plan file to be used")
    parser.add_argument("-r",
        "--repositories",
        dest="repository_path",
        default="repositories",
        help="Test plan file to be used")
    parser.add_argument("-i",
        "--ignore-clone",
        dest="ignore_clone",
        action="store_true",
        default=False,
        help="Ignore cloning repositories and use previously cloned")

    args = parser.parse_args()
    print args.ignore_clone
    if os.path.exists(args.testplan) and os.path.isfile(args.testplan):
        testplan = open(args.testplan, "r")
        tp_obj = yaml.load(testplan.read())
        repo_list = repository_list(tp_obj)
        repositories = {}
        for repo in repo_list:
            repo_url, repo_path = clone_repository(repo, args.repository_path, args.ignore_clone)
            repositories.update({repo_url: repo_path})
        # ToDo: check test plan structure
        for requirement in tp_obj['requirements']:
            check_coverage(requirement, repositories)
        render(tp_obj)
        testplan.close()
# go through requiremets and for each test:
#  - if file exists render test as separate html file
#  - if file is missing, indicate missing test (red)
# render test plan with links to test files
# add option to render as single file (for pdf generation)

if __name__ == "__main__":
    main()