import os
import subprocess

from .pkgbuild import PKGBUILD

class Package(object):
    def __init__(self, repo, config):
        self.repo = repo
        self.config = config

    def _exec(self, *args):
        try:
            subprocess.check_output(args, cwd=self.path)

        except subprocess.CalledProcessError as e:
            print(e.stderr)

    def _git(self, *args):
        self._exec('git', *args)

    def _clone(self):
        if not os.path.exists(self.path):
            os.makedirs(self.path)

        self._git("init")
        self._git("remote", "add", "origin", self.url)
        self._git("fetch", "origin")
        self._git("checkout", "master")

    @property
    def name(self):
        return self.config["name"]

    @property
    def url(self):
        return self.config.get("url") or "https://aur.archlinux.org/{}.git".format(
                self.name)

    @property
    def path(self):
        return os.path.join(self.repo.config.config['cachedir'], self.name)


    @property
    def PKGBUILD(self):
        if not os.path.exists(self.path):
            self._clone()

        if not os.path.exists(os.path.join(self.path, "PKGBUILD")):
            self.update()

        if not hasattr(self, '_PKGBUILD'):
            self._PKGBUILD = PKGBUILD(os.path.join(self.path, 'PKGBUILD'))

        return self._PKGBUILD

    def update(self):
        if not os.path.exists(os.path.join(self.path, '.git')):
            self._clone()

        else:
            self._git("remote", "set-url", "origin", self.url)
            self._git("checkout", "-f")
            self._git("fetch", "--prune", "origin")
            self._git("checkout", "-B", "master", "origin/master")

    def makepkg(self):
        self._exec("makepkg")


class Repo(object):
    def __init__(self, config):
        self.config = config
        self.packages = []
        for package in self.config["packages"]:
            if isinstance(package, str):
                self.packages.append(Package(self, dict(name=package)))

            else:
                self.packages.append(Package(self, package))

    @property
    def name(self):
        return self.config.name

    @property
    def id(self):
        return self.config.id