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"""
Checks if rosdep database has been initialized
"""
import os


def get_user_home_directory():
    """Returns cross-platform user home directory """
    return os.path.expanduser("~")


def rosdep_database_updated_check(ctx):
    """Makes sure rosdep database is updated"""
    if not os.path.exists((os.path.join(get_user_home_directory(), '.ros', 'rosdep', 'sources.cache', 'index'))):
        return "Please update rosdep database with 'rosdep update'."


warnings = []

errors = [(rosdep_database_updated_check,
           "ROS Dep database not updated: "),
         ]


def wtf_check(ctx):
    """Check implementation function for roswtf"""
    from roswtf.rules import warning_rule, error_rule
    for r in warnings:
        warning_rule(r, r[0](ctx), ctx)
    for r in errors:
        error_rule(r, r[0](ctx), ctx)
