# -*- coding: utf-8 -*-

import os
import subprocess

from lxcmgr.paths import LXC_STORAGE_DIR
from lxcmgr.pkgmgr import PkgMgr

from . import crypto
from .packer import Packer
from .paths import REPO_IMAGES_DIR

class ImagePacker(Packer):
    def __init__(self, image):
        super().__init__()
        self.image = image
        # Prepare package file names
        self.tar_path = os.path.join(REPO_IMAGES_DIR, '{}.tar'.format(self.image.name))
        self.xz_path = '{}.xz'.format(self.tar_path)

    def pack(self):
        if self.image.force_build:
            self.unregister()
            try:
                os.unlink(self.xz_path)
            except FileNotFoundError:
                pass
        elif os.path.exists(self.xz_path):
            raise PackageExistsError(self.xz_path)
        self.create_archive()
        self.register()
        self.sign_packages()

    def remove(self):
        self.unregister()
        try:
            os.unlink(self.xz_path)
        except FileNotFoundError:
            pass

    def create_archive(self):
        # Create archive
        print('Archiving', self.image.path)
        subprocess.run(['tar', '--xattrs', '-cpf', self.tar_path, self.image.name], cwd=LXC_STORAGE_DIR)
        self.compress_archive()

    def register(self):
        # Register image in global repository metadata file
        print('Registering package {}'.format(self.image.name))
        self.packages['images'][self.image.name] = self.image.conf.copy()
        self.packages['images'][self.image.name]['size'] = self.tar_size
        self.packages['images'][self.image.name]['pkgsize'] = self.xz_size
        self.packages['images'][self.image.name]['sha512'] = crypto.hash_file(self.xz_path)
        self.save_repo_meta()
        # Register the image also to locally installed images for package manager
        pm = PkgMgr()
        pm.register_image(self.image.name, self.packages['images'][self.image.name])

    def unregister(self):
        # Removes package from global repository metadata file
        if self.image.name in self.packages['images']:
            del self.packages['images'][self.image.name]
            self.save_repo_meta()
        # Unregister the image also from locally installed images for package manager
        pm = PkgMgr()
        pm.unregister_image(self.image.name)