# Copyright (c) 2021, Open Source Robotics Foundation
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from . import find_package


def make_suggestion(config, key, os_name):
    """
    Attempt to find packages which may satisfy a key based on the name.

    This function uses heuristics to suggest OS packages which may satisfy a
    key. Many of the heuristics do not apply to all platforms.

    :param config: the parsed YAML configuration.
    :param key: the name of the unsatisifed key.
    :param os_name: the name of the OS associated with the package.
    """
    os_version = config['supported_versions'][os_name][-1]
    os_arch = config['supported_arches'][os_name][0]
    # 1) Check for verbatim key
    suggestion = find_package(config, key, os_name, os_version, os_arch)
    if suggestion:
        print("Suggesting '%s' package for %s" % (suggestion.binary_name, os_name))
        return suggestion
    else:
        print("No '%s' package for %s %s (%s). Looking for variants..." % (
            key, os_name, os_version, os_arch))
    # 2) Try -devel in place of -dev
    if key.endswith('-dev'):
        suggestion = make_suggestion(config, key[:-4] + '-devel', os_name)
        if suggestion:
            return suggestion
    # 3) Try with 'lib' prefix
    if key.startswith('lib'):
        suggestion = make_suggestion(config, key[3:], os_name)
        if suggestion:
            return suggestion
    # 4) Try cmake(foo) and pkgconfig(foo)
    if key.endswith('-devel'):
        suggestion = make_suggestion(config, 'cmake(' + key[:-6] + ')', os_name)
        if suggestion:
            return suggestion
        suggestion = make_suggestion(config, 'pkgconfig(' + key[:-6] + ')', os_name)
        if suggestion:
            return suggestion