import subprocess, os, glob

def get_pkg_list():
    """
    Run a couple shell commands to parse the metadata directory for its packages.
    :return: List of packages in metadata directory
    """
    find_proc = subprocess.run(["find", "metadata",
                                  "-name", "meta.yaml"],
                                 stdout=subprocess.PIPE)
    paths = find_proc.stdout.decode('utf-8')
    fmt_paths = paths.replace("metadata/", "").replace("/meta.yaml", "")
    return fmt_paths.split('\n')


class Recipe:
    def __init__(self, buildout, name, options):
        """
        Initializes fields needed for recipe.
        :param buildout: (Boilerplate) Dictionary of options from buildout section
        of buildout.cfg
        :param name: (Boilerplate) Name of section that uses this recipe.
        :param options: (Boilerplate) Options of section that uses this recipe.
        """
        self.options = options
        self.pkg_list = get_pkg_list()

    def install(self):
        """
        Install method that runs when recipe has components it needs to install.
        :return: Paths to files, as strings, created by the recipe.
        """
        if self.options['name'] == "all":
            pkgs = self.pkg_list
        else:
            pkgs = self.options['name'].split(',')

        for p in pkgs:
            if p not in self.pkg_list:
                print("Package {} not valid. Skipping.".format(p))
                continue
            subprocess.run(["conda", "build", "metadata/{}".format(p), "--output-folder", "pkgs/"],
                           stdout=subprocess.PIPE)
        self.options.created("pkgs/")

        subprocess.run(["python3", "tools/transfer_to_builder.py"])

        return self.options.created()

    update = install