#!/usr/bin/env python
"""Download packages from github actions artifacts
"""

import io
import os
import sys
import logging
import datetime as dt
from pathlib import Path
from zipfile import ZipFile

import requests

logger = logging.getLogger()
logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(message)s")

REPOS = "psycopg/psycopg2"
WORKFLOW_NAME = "Build packages"


class ScriptError(Exception):
    """Controlled exception raised by the script."""


def main():
    try:
        token = os.environ["GITHUB_TOKEN"]
    except KeyError:
        raise ScriptError("please set a GITHUB_TOKEN to download artifacts")

    s = requests.Session()
    s.headers["Accept"] = "application/vnd.github.v3+json"
    s.headers["Authorization"] = f"token {token}"

    logger.info("looking for recent runs")
    resp = s.get(f"https://api.github.com/repos/{REPOS}/actions/runs?per_page=10")
    resp.raise_for_status()
    for run in resp.json()["workflow_runs"]:
        if run["name"] == WORKFLOW_NAME:
            break
    else:
        raise ScriptError(f"couldn't find {WORKFLOW_NAME!r} in recent runs")

    if run["status"] != "completed":
        raise ScriptError(f"run #{run['run_number']} is in status {run['status']}")

    updated_at = dt.datetime.fromisoformat(run["updated_at"].replace("Z", "+00:00"))
    now = dt.datetime.now(dt.timezone.utc)
    age = now - updated_at
    logger.info(f"found run #{run['run_number']} updated {pretty_interval(age)} ago")
    if age > dt.timedelta(hours=6):
        logger.warning("maybe it's a bit old?")

    logger.info(f"looking for run #{run['run_number']} artifacts")
    resp = s.get(f"{run['url']}/artifacts")
    resp.raise_for_status()
    artifacts = resp.json()["artifacts"]

    dest = Path("packages")
    if not dest.exists():
        logger.info(f"creating dir {dest}")
        dest.mkdir()

    for artifact in artifacts:
        logger.info(f"downloading {artifact['name']} archive")
        zip_url = artifact["archive_download_url"]
        resp = s.get(zip_url)
        with ZipFile(io.BytesIO(resp.content)) as zf:
            logger.info("extracting archive content")
            zf.extractall(dest)

    logger.info(f"now you can run: 'twine upload -s {dest}/*'")


def pretty_interval(td):
    secs = td.total_seconds()
    mins, secs = divmod(secs, 60)
    hours, mins = divmod(mins, 60)
    days, hours = divmod(hours, 24)
    if days:
        return f"{int(days)} days, {int(hours)} hours, {int(mins)} minutes"
    elif hours:
        return f"{int(hours)} hours, {int(mins)} minutes"
    else:
        return f"{int(mins)} minutes"


if __name__ == "__main__":
    try:
        sys.exit(main())

    except ScriptError as e:
        logger.error("%s", e)
        sys.exit(1)

    except KeyboardInterrupt:
        logger.info("user interrupt")
        sys.exit(1)