#!/usr/bin/env python3
import json
import os
import re
import sys
from pathlib import Path
from urllib.request import Request, urlopen

TOOLS_DIR = os.path.dirname(os.path.abspath(__file__))
os.chdir(os.path.dirname(TOOLS_DIR))
sys.path.insert(0, os.path.dirname(TOOLS_DIR))

from zerver.openapi.merge_api_changelogs import get_feature_level


def get_pull_request_number_or_commit_hash() -> str:
    github_token = os.environ["GITHUB_TOKEN"]
    repo = os.environ["GITHUB_REPOSITORY"]
    commit_hash = os.environ["GITHUB_SHA"]

    url = f"https://api.github.com/repos/{repo}/commits/{commit_hash}/pulls"
    headers = {
        "Accept": "application/vnd.github.groot-preview+json",
        "Authorization": f"token {github_token}",
    }

    try:
        req = Request(url, headers=headers)
        with urlopen(req) as response:
            pull_requests = json.load(response)
        if len(pull_requests) > 0:
            return f"#{pull_requests[0]['number']}"
        return commit_hash
    except Exception:
        return commit_hash


def get_changed_api_endpoints() -> list[str]:
    changelog_path = Path("api_docs/changelog.md")
    feature_level_pattern = re.compile(r"\*\*Feature level \d+\*\*")
    link_pattern = re.compile(r"(\[[^\]]+\]\([^)]+\))")

    current_feature_level_found = False
    endpoints = []

    with open(changelog_path) as file:
        for line in file:
            if re.fullmatch(feature_level_pattern, line.strip()):
                if current_feature_level_found:
                    break
                current_feature_level_found = True
                continue

            if current_feature_level_found and line.strip().startswith("*"):
                endpoints.extend(link_pattern.findall(line.split(":", 1)[0]))

    return endpoints


if __name__ == "__main__":
    pull_request = get_pull_request_number_or_commit_hash()

    feature_level = get_feature_level(update_feature_level=False)
    endpoints = get_changed_api_endpoints()
    topic = f"new feature level: {feature_level}"
    endpoints_string = ", ".join(endpoints)

    content = f"{pull_request} has updated the API documentation for the following endpoints: {endpoints_string}."
    print(f"topic={topic}\ncontent={content}")