#! /usr/bin/env python3
# -*- coding: utf-8 -*-

#https://github.com/lkiesow/python-feedgen
#Package in Arch [Communiy] python-feedgen . Not python-feedgenerator

#https://feedgen.kiesow.be/api.entry.html

try:
    from zoneinfo import ZoneInfo
except ModuleNotFoundError:
    from backports.zoneinfo import ZoneInfo
from datetime import datetime, timezone, tzinfo

import sys
from feedgen.feed import FeedGenerator

try:
    datetime.fromisoformat
except AttributeError:
    import backports.datetime_fromisoformat
    from backports.datetime_fromisoformat import MonkeyPatch
    MonkeyPatch.patch_fromisoformat()


fg = FeedGenerator()

descs = {
    "patroneo" : """Patroneo is an easy to use, pattern based midi sequencer.""",
    "laborejo" : """Laborejo is a MIDI sequencer based on classical music notation.""",
    #"fluajho" : """Fluajho is a simple, standalone sf2 soundfont host/player.""",
    "agordejo" : """Agordejo is a music and audio production session manager based on NSM.""",
    "tembro" : """Tembro is a virtual software instrument based on samples. All instruments are permanently built-in.""",
    }

if (not len(sys.argv) == 4) or not sys.argv[1] in descs or not sys.argv[2].endswith("/CHANGELOG") or not sys.argv[3].endswith("feed.atom"):
    raise ValueError("Wrong number or wrong arguments:  ./atomfeedgen.py patroneo /home/nils/lss/patroneo/CHANGELOG out/patroneo/feed.atom" )

project = sys.argv[1]
CHANGELOGFILE = sys.argv[2]
assert project in descs
description = descs[project]

print (f"Atom Feed Generation: {project}")

fg.id(f"https://laborejo.org/{project}/")
fg.title(f"{project.title()} Releases")
fg.author( {'name':'Laborejo Software Suite','email':'info@laborejo.org'} )
fg.link( href=f"https://laborejo.org/{project}/", rel='alternate' )
fg.logo(f"https://laborejo.org/images/{project}.png")
fg.subtitle(description)
fg.link( href=f"https://laborejo.org/{project}/feed.atom", rel="self" )
fg.language('en')



with open(CHANGELOGFILE) as fcl:
    changelogData = fcl.read()


for cl in changelogData.split("\n\n\n"):

    firstLine, changelog = cl.split("\n", maxsplit=1)
    if firstLine.startswith("#Changelog"):
        #preamble. skip
        continue
    # Format:## YYYY-MM-DD major.minor.patch
    assert "##" in firstLine, firstLine
    markdownTitle, date, semVersion = firstLine.split(" ")
    assert markdownTitle == "##", markdownTitle
    assert date.count("-") == 2, date
    assert semVersion.count(".") == 2, semVersion
    print(firstLine, "parsed as date:", date, "with version:", semVersion)
    semVersion  = semVersion.strip()
    isodate = datetime.fromisoformat(date.strip())
    isodate = isodate.replace(tzinfo=ZoneInfo("UTC"))


    fe = fg.add_entry()
    fe.id(f"https://laborejo.org/downloads/{project}-{semVersion}")
    fe.title(f"{project.title()} Version {semVersion}")
    #fe.link(href=f"https://laborejo.org/downloads/{project}-{semVersion}.tar.gz")
    fe.link(href=f"https://laborejo.org/{project}")
    #fe.pubDate(isodate)
    fe.updated(isodate)
    fe.rights("GPL3+")

    cl = "</li>".join("<li>" + line.lstrip() for line in changelog.split("\n"))

    desc = f"""
    Download: <a href="https://laborejo.org/downloads/{project}-{semVersion}.tar.gz">https://laborejo.org/downloads/{project}-{semVersion}.tar.gz</a>
    <p>
    Changelog:
    <ul>
    {cl}
    </ul>
    </p>
    """
    fe.content(desc, type="html")

atomfeed = fg.atom_str(pretty=True) # Get the ATOM feed as string
fg.atom_file(sys.argv[3]) # Write the ATOM feed to a file