#!/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 random import randrange
from time import sleep
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
import requests
from django.conf import settings
from typing_extensions import TypedDict

django.setup()

from zerver.lib.avatar_hash import gravatar_hash
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] = []
    retry_attempts = 0
    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}"}

    while True:
        response: requests.Response = requests.get(
            api_link, {**api_data, "page": f"{page_index}"}, verify=certificates, headers=headers
        )
        if response.status_code == 200:
            data = response.json()
            if len(data) == 0:
                return contributors
            contributors.extend(data)
            retry_attempts = 0
            page_index += 1
        else:
            retry_attempts += 1
            if retry_attempts > args.max_retries:
                logger.warning("Failed retries fetching contributors data from GitHub.")
                sys.exit(1)

            sleep_time = randrange(0, min(64, 2 ** retry_attempts))
            sleep(sleep_time)


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()