# Copyright 2015 Pants project contributors (see CONTRIBUTORS.md).
# Licensed under the Apache License, Version 2.0 (see LICENSE).


from colors import blue, cyan, green

from pants.help.build_dictionary_info_extracter import BuildDictionaryInfoExtracter
from pants.task.console_task import ConsoleTask


class TargetsHelp(ConsoleTask):
    """List available target types."""

    _register_console_transitivity_option = False

    @classmethod
    def register_options(cls, register):
        super().register_options(register)
        register("--details", help="Show details about this target type.")
        register(
            "--transitive",
            type=bool,
            default=True,
            fingerprint=True,
            removal_version="1.27.0.dev0",
            removal_hint="This option has no impact on the goal `targets`.",
        )

    def console_output(self, targets):
        buildfile_aliases = self.context.build_configuration.registered_aliases()
        extracter = BuildDictionaryInfoExtracter(buildfile_aliases)

        alias = self.get_options().details
        if alias:
            tti = next(x for x in extracter.get_target_type_info() if x.symbol == alias)
            yield blue("\n{}\n".format(tti.description))
            yield blue("{}(".format(alias))

            for arg in tti.args:
                default = green("(default: {})".format(arg.default) if arg.has_default else "")
                yield "{:<30} {}".format(
                    cyan("  {} = ...,".format(arg.name)),
                    " {}{}{}".format(arg.description, " " if arg.description else "", default),
                )

            yield blue(")")
        else:
            for tti in extracter.get_target_type_info():
                yield "{} {}".format(cyan("{:>30}:".format(tti.symbol)), tti.description)