#!/usr/bin/env python3

# Copyright 2022 The IREE Authors
#
# Licensed under the Apache License v2.0 with LLVM Exceptions.
# See https://llvm.org/LICENSE.txt for license information.
# SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
"""Creates an HTML page for releases for `pip install --find-links` from GitHub releases."""
# TODO(#10479) since we're generating this we might as well create a PEP 503
# compliant index
import argparse
import html
import json
import subprocess
import sys
import textwrap

import requests


def parse_arguments():
  parser = argparse.ArgumentParser()
  parser.add_argument("--repo",
                      "--repository",
                      default="iree-org/iree",
                      help="The GitHub repository to fetch releases from.")
  parser.add_argument(
      "--output",
      default="-",
      help="The file to write the HTML to or '-' for stdout (the default)")
  return parser.parse_args()


class ReleaseFetcher:

  def __init__(self, repo, per_page=100):
    self._session = requests.Session()
    self._repo = repo
    self._per_page = per_page

  def get_all(self):
    url = f"https://api.github.com/repos/{self._repo}/releases"
    page = 1

    while True:
      response = self._session.get(url,
                                   params={
                                       "page": page,
                                       "per_page": self._per_page,
                                   })
      for release in response.json():
        yield release
      if "next" not in response.links:
        break
      page += 1


def main(args):
  fetcher = ReleaseFetcher(repo=args.repo)
  with (sys.stdout if args.output == "-" else open(args.output, "w")) as f:
    f.write(
        textwrap.dedent("""\
            <!DOCTYPE html>
            <html>
              <body>
            """))
    for release in fetcher.get_all():
      if release["draft"]:
        continue
      for asset in release["assets"]:
        url = html.escape(asset['browser_download_url'])
        name = html.escape(asset['name'])
        f.write(f"    <a href={url}>{name}</a><br />\n")
    f.write(textwrap.dedent("""\
      </body>
    </html>
    """))


if __name__ == "__main__":
  main(parse_arguments())