#!/usr/bin/python3

import datetime
import dnf
import json
import sys


def timestamp_to_rfc3339(timestamp):
    d = datetime.datetime.utcfromtimestamp(package.buildtime)
    return d.strftime('%Y-%m-%dT%H:%M:%SZ')


# base.sack.query().filter(provides=str(reldep))


try:
    command = sys.argv[1]
    arguments = sys.argv[2:]
except IndexError:
    command = "list"
    arguments = []


base = dnf.Base()

base.conf.cachedir = "./dnf-cache"
base.conf.substitutions["releasever"] = "30"
base.conf.substitutions["basearch"] = "x86_64"

repo = dnf.repo.Repo("fedora", base.conf)
repo.name = "Fedora"
repo.metalink = "https://mirrors.fedoraproject.org/metalink?repo=fedora-$releasever&arch=$basearch"

base.repos.add(repo)
base.fill_sack(load_system_repo=False)

if command == "list":
    packages = [p.name for p in base.sack.query().available()]
    json.dump(packages, sys.stdout)

elif command == "dump":
    packages = []
    for package in base.sack.query().available():
        packages.append({
            "name": package.name,
            "summary": package.summary,
            "description": package.description,
            "url": package.url,
            "epoch": package.epoch,
            "version": package.version,
            "release": package.release,
            "arch": package.arch,
            "buildtime": timestamp_to_rfc3339(package.buildtime),
            "license": package.license
        })
    json.dump(packages, sys.stdout)

elif command == "depsolve":
    for pkgspec in arguments:
        base.install(pkgspec)
    base.resolve()
    packages = []
    for package in base.transaction.install_set:
        packages.append({
            "name": package.name,
            "epoch": package.epoch,
            "version": package.version,
            "release": package.release,
            "arch": package.arch
        })
    json.dump(packages, sys.stdout)