"""
A Fake Data API for testing purposes.
"""
import copy
import datetime


_DEFAULT_FAKE_MODE = {
    "slug": "honor",
    "name": "Honor Code Certificate",
    "min_price": 0,
    "suggested_prices": "",
    "currency": "usd",
    "expiration_datetime": None,
    "description": None
}

_ENROLLMENTS = []

_COURSES = []


# pylint: disable=unused-argument
def get_course_enrollments(student_id):
    """Stubbed out Enrollment data request."""
    return _ENROLLMENTS


def get_course_enrollment(student_id, course_id):
    """Stubbed out Enrollment data request."""
    return _get_fake_enrollment(student_id, course_id)


def update_course_enrollment(student_id, course_id, mode=None, is_active=None):
    """Stubbed out Enrollment data request."""
    enrollment = _get_fake_enrollment(student_id, course_id)
    if not enrollment:
        enrollment = add_enrollment(student_id, course_id)
    if mode is not None:
        enrollment['mode'] = mode
    if is_active is not None:
        enrollment['is_active'] = is_active
    return enrollment


def get_course_enrollment_info(course_id):
    """Stubbed out Enrollment data request."""
    return _get_fake_course_info(course_id)


def _get_fake_enrollment(student_id, course_id):
    """Get an enrollment from the enrollments array."""
    for enrollment in _ENROLLMENTS:
        if student_id == enrollment['student'] and course_id == enrollment['course']['course_id']:
            return enrollment


def _get_fake_course_info(course_id):
    """Get a course from the courses array."""
    for course in _COURSES:
        if course_id == course['course_id']:
            return course


def add_enrollment(student_id, course_id, is_active=True, mode='honor'):
    """Append an enrollment to the enrollments array."""
    enrollment = {
        "created": datetime.datetime.now(),
        "mode": mode,
        "is_active": is_active,
        "course": _get_fake_course_info(course_id),
        "student": student_id
    }
    _ENROLLMENTS.append(enrollment)
    return enrollment


def add_course(course_id, enrollment_start=None, enrollment_end=None, invite_only=False, course_modes=None):
    """Append course to the courses array."""
    course_info = {
        "course_id": course_id,
        "enrollment_end": enrollment_end,
        "course_modes": [],
        "enrollment_start": enrollment_start,
        "invite_only": invite_only,
    }
    if not course_modes:
        course_info['course_modes'].append(_DEFAULT_FAKE_MODE)
    else:
        for mode in course_modes:
            new_mode = copy.deepcopy(_DEFAULT_FAKE_MODE)
            new_mode['slug'] = mode
            course_info['course_modes'].append(new_mode)
    _COURSES.append(course_info)


def reset():
    """Set the enrollments and courses arrays to be empty."""
    global _COURSES  # pylint: disable=global-statement
    _COURSES = []
    global _ENROLLMENTS  # pylint: disable=global-statement
    _ENROLLMENTS = []
