#!/usr/bin/python

'''
A script to fetch recent contributors to borgmatic, used during documentation generation.
'''

import datetime
import itertools
import operator
import subprocess

import requests


def list_merged_pulls(url):
    '''
    Given a Gitea or GitHub API endpoint URL for pull requests, fetch and return the corresponding
    JSON for all such merged pull requests.
    '''
    response = requests.get(f'{url}?state=closed', headers={'Accept': 'application/json', 'Content-Type': 'application/json'})

    if not response.ok:
        response.raise_for_status()

    return tuple(pull for pull in response.json() if pull.get('merged_at'))


def list_contributing_issues(url):
    response = requests.get(url, headers={'Accept': 'application/json', 'Content-Type': 'application/json'})

    if not response.ok:
        response.raise_for_status()

    return tuple(response.json())


PULLS_API_ENDPOINT_URLS = (
    'https://projects.torsion.org/api/v1/repos/borgmatic-collective/borgmatic/pulls',
    'https://api.github.com/repos/borgmatic-collective/borgmatic/pulls',
)
ISSUES_API_ENDPOINT_URL = 'https://projects.torsion.org/api/v1/repos/borgmatic-collective/borgmatic/issues?state=all'
RECENT_CONTRIBUTORS_CUTOFF_DAYS = 365


def get_item_timestamp(item):
    return item.get('merged_at') or item.get('created_at')


def print_contributors():
    '''
    Display the recent contributors as a row of avatars in an HTML fragment.
    '''
    pulls = tuple(itertools.chain.from_iterable(list_merged_pulls(url) for url in PULLS_API_ENDPOINT_URLS))
    issues = list_contributing_issues(ISSUES_API_ENDPOINT_URL)
    seen_user_ids = set()

    print('<p>')

    for item in sorted(pulls + issues, key=get_item_timestamp, reverse=True):
        timestamp = get_item_timestamp(item)
        user = item.get('user')

        if not timestamp or not user:
            continue

        user_id = user.get('id')

        if not user_id or user_id in seen_user_ids:
            continue

        if datetime.datetime.fromisoformat(timestamp) < datetime.datetime.now(datetime.timezone.utc) - datetime.timedelta(days=RECENT_CONTRIBUTORS_CUTOFF_DAYS):
            continue

        seen_user_ids.add(user_id)
        print(
            f'''<a href="{user.get('html_url')}?tab=activity"><img src="{user.get('avatar_url')}" width="50" height="50" title="{user.get('full_name') or user.get('login')}" /></a>'''
        )

    print('</p>')


if __name__ == '__main__':
    print_contributors()