import os
import util
import colors
import time

from verbs.install import find_package, install_multiple
from verbs.sync import sync

VERSION_COMPARED = "CHECKSUM"

def get_installed_versions(config, root="/"):
    packages = {}

    installed_dir = util.add_path(root, config["dir"]["installed"])
    if os.path.exists(installed_dir):
        files = os.listdir(installed_dir)
        for package in files:
            with open(util.add_path(installed_dir, package, "info")) as file:
                for line in file:
                    if line.startswith(VERSION_COMPARED):
                        packages[package] = line.strip().split("=")[-1]

    return packages

def get_available_version(package_name, config, root="/"):
    repos = config["repos"]
    packages_dir = config["dir"]["packages"]
    sources = config["sources"]
    checksum, found_sources, requested_repo, size, files = find_package(package_name, repos, packages_dir, sources)
    return checksum
    
def update(args, options, config):
    if not options["l"]:
        sync(args, options, config)

    v = options["v"]

    updates = [package for package,checksum in get_installed_versions(config, options["r"]).items() if not checksum == get_available_version(package, config, options["r"])]

    if len(args) > 0:
        updates = [update for update in updates if update in args]

    if len(updates) > 0:
        install_multiple(updates, args, options, config, terminology=("update", "updated", "updating"))
    else:
        print(colors.LIGHT_RED + "Nothing to do")