import json

import jinja2


# The Jinja2 environment
_ENV = None


def env_init(force: bool = False):
    '''
    Initialize the Jinja2 environment.
    @param force If true, force reload the environment.
    '''
    global _ENV
    if _ENV is None or force:
        # Use json.dumps as finalizer in order to preserve complex data structures
        _ENV = jinja2.Environment(finalize=json.dumps)
    return _ENV


def render(template: str):
    '''
    Render the given string as a Jinja2 template.
    @param template The template string to render
    '''
    # Make sure the Jinaj2 environment is initialized
    env = env_init()
    # Create a Jinja2 template from the input string
    t = env.from_string(template)
    # Render the template and turn the JSON dump back into complex data structures
    return json.loads(t.render())