#!/usr/bin/python3
"""Upload a gist containing packages installed on the system.

Dependencies
============
* pacman
* gist
"""

import argparse
import configparser
import logging
import subprocess
import sys
import tempfile

import packaging_scripts.pacman as pacman

# ========== Constants ==========
# Commands
PACMAN_CMD = "/usr/bin/pacman"
LOCALE = "utf-8"

# Paths
CONFIG_FILE = "/etc/packaging-scripts.conf"
DEFAULT_FILENAME = "pacman-packages.txt"

# Config file options
CONFIG_SECTION = "Main"
ENABLE_CONFIG_OPTION = "GIST_PUG_ENABLE"

# ========== Logging setup ==========
console_formatter = logging.Formatter("==> %(levelname)s %(message)s")
syslog = logging.getLogger("packaging_scripts")
syslog.setLevel(logging.DEBUG)

stdout_handler = logging.StreamHandler(sys.stdout)
stdout_handler.setLevel(logging.INFO)
stdout_handler.setFormatter(console_formatter)
stdout_handler.addFilter(lambda record: record.levelno <= logging.INFO)

stderr_handler = logging.StreamHandler(sys.stderr)
stderr_handler.setLevel(logging.WARNING)
stderr_handler.setFormatter(console_formatter)

syslog.addHandler(stdout_handler)
syslog.addHandler(stderr_handler)


# ========== Functions ==========
def configured_to_run():
    """Verify the script is enabled to run in the config file.
    :returns: true if enabled in config, false if otherwise
    """
    config = configparser.ConfigParser()
    config.read(CONFIG_FILE)
    return config.getboolean(CONFIG_SECTION, ENABLE_CONFIG_OPTION)


# ========== Main Script ==========
if __name__ == "__main__":
    if not configured_to_run():
        # Silently exit, we don't need to cause an error message with pacman
        sys.exit(0)

    # Parse any arguments
    parser = argparse.ArgumentParser()
    parser.add_argument(
        "-f",
        "--filename",
        dest="filename",
        type=str,
        default=DEFAULT_FILENAME,
        help="alternative filename to upload as",
    )
    args = parser.parse_args()

    filename = args.filename

    # Run process that lists packages
    packages = subprocess.run([PACMAN_CMD, "-Qqem"], capture_output=True).stdout

    # Write package list to file and perform upload
    with tempfile.NamedTemporaryFile() as tmpfile:
        tmpfile.write(packages)
        # We use the filename in the command, not in the tempfile so gist knows what to upload as
        subprocess.run(["gist", "-f", args.filename, tmpfile.name])