#!/usr/bin/env python3
"""
Fetch contributors data from GitHub using their API, convert it to structured
JSON data for the /team page contributors section.
"""
import argparse
import json
import logging
import os
import sys
import unicodedata
from datetime import date
from typing import Dict, List, Optional, Union

sys.path.insert(0, os.path.join(os.path.dirname(__file__), ".."))
from scripts.lib.setup_path import setup_path

setup_path()
os.environ["DJANGO_SETTINGS_MODULE"] = "zproject.settings"

import django
from django.conf import settings
from typing_extensions import TypedDict
from urllib3.util import Retry

django.setup()

from zerver.lib.avatar_hash import gravatar_hash
from zerver.lib.github import GithubSession
from zproject.config import get_secret

duplicate_commits_file = os.path.join(os.path.dirname(__file__), "duplicate_commits.json")

parser = argparse.ArgumentParser()
parser.add_argument(
    "--max-retries", type=int, default=10, help="Number of times to retry fetching data from GitHub"
)
args = parser.parse_args()


class ContributorsJSON(TypedDict):
    date: str
    contributors: List[Dict[str, Union[int, str]]]


class Contributor(TypedDict):
    avatar_url: Optional[str]
    contributions: int
    login: Optional[str]
    email: Optional[str]
    name: Optional[str]


logger = logging.getLogger("zulip.fetch_contributors_json")


def fetch_contributors(repo_name: str, max_retries: int) -> List[Contributor]:
    contributors: List[Contributor] = []
    page_index = 1

    api_link = f"https://api.github.com/repos/zulip/{repo_name}/contributors"
    api_data = {"anon": "1"}
    certificates = os.environ.get("CUSTOM_CA_CERTIFICATES")

    headers: Dict[str, str] = {}
    personal_access_token = get_secret("github_personal_access_token")
    if personal_access_token is not None:
        headers = {"Authorization": f"token {personal_access_token}"}

    Retry.BACKOFF_MAX = 64
    retry = Retry(
        total=max_retries,
        backoff_factor=2.0,
        status_forcelist={
            403,  # Github does unauth rate-limiting via 403's
            429,  # The formal rate-limiting response code
            502,  # Bad gateway
            503,  # Service unavailable
        },
    )
    session = GithubSession(max_retries=retry)
    while True:
        response = session.get(
            api_link,
            params={**api_data, "page": f"{page_index}"},
            verify=certificates,
            headers=headers,
        )
        response.raise_for_status()
        data = response.json()
        if len(data) == 0:
            return contributors
        contributors.extend(data)
        page_index += 1


def write_to_disk(json_data: ContributorsJSON, out_file: str) -> None:
    with open(out_file, "w") as f:
        json.dump(json_data, f, indent=2, sort_keys=True)
        f.write("\n")


def update_contributor_data_file() -> None:
    # This list should hold all repositories that should be included in
    # the total count, including those that should *not* have tabs on the team
    # page (e.g. if they are deprecated).
    repo_names = [
        "zulip",
        "zulip-desktop",
        "zulip-mobile",
        "python-zulip-api",
        "zulip-js",
        "zulipbot",
        "zulip-terminal",
        "zulip-ios-legacy",
        "zulip-android",
    ]

    data: ContributorsJSON = dict(date=str(date.today()), contributors=[])
    contributor_username_to_data: Dict[str, Dict[str, Union[str, int]]] = {}

    for repo_name in repo_names:
        contributors = fetch_contributors(repo_name, args.max_retries)
        for contributor in contributors:
            username = contributor.get("login") or contributor.get("email")
            assert username is not None
            if username in contributor_username_to_data:
                contributor_username_to_data[username][repo_name] = contributor["contributions"]
            else:
                contributor_username_to_data[username] = {repo_name: contributor["contributions"]}

                avatar_url = contributor.get("avatar_url")
                if avatar_url is not None:
                    contributor_username_to_data[username]["avatar"] = avatar_url

                email = contributor.get("email")
                if email is not None:
                    contributor_username_to_data[username]["email"] = email
                    hash_key = gravatar_hash(email)
                    gravatar_url = f"https://secure.gravatar.com/avatar/{hash_key}?d=identicon"
                    contributor_username_to_data[username]["avatar"] = gravatar_url

                login = contributor.get("login")
                if login is not None:
                    contributor_username_to_data[username]["github_username"] = login

                name = contributor.get("name")
                if name is not None:
                    contributor_username_to_data[username]["name"] = unicodedata.normalize(
                        "NFC", name
                    )

    # remove duplicate contributions count
    # find commits at the time of split and subtract from zulip-server
    with open(duplicate_commits_file) as f:
        duplicate_commits = json.load(f)
        for committer in duplicate_commits:
            if committer in contributor_username_to_data and contributor_username_to_data[
                committer
            ].get("zulip"):
                total_commits = contributor_username_to_data[committer]["zulip"]
                assert isinstance(total_commits, int)
                duplicate_commits_count = duplicate_commits[committer]
                original_commits = total_commits - duplicate_commits_count
                contributor_username_to_data[committer]["zulip"] = original_commits

    data["contributors"] = list(contributor_username_to_data.values())
    write_to_disk(data, settings.CONTRIBUTOR_DATA_FILE_PATH)


if __name__ == "__main__":
    update_contributor_data_file()