"""Log messages showing up on Discord."""
import logging
from os import makedirs

from django.conf import settings

from bot import hitomi

logger = logging.getLogger(__name__)


def on_message(message):
    """Log the seen message."""
    try:
        log_file = log_file_for_message(message)
        log_line = "{0:s}\t{1:s}\t{2:s}\t{3:s}".format(str(message.timestamp), str(message.author), str(message.id),
                                                       str(message.content))
        logger.info("{0:s} - {1:s}".format(log_file, log_line))
        with open(log_file, 'a') as log_fd:
            print(log_line, file=log_fd)
    except Exception as ex:
        logger.error("error in creating log line")
        logger.exception(ex)


hitomi.on_message_handlers.append(on_message)


@hitomi.event
async def on_message_delete(message):
    """Log the message deletion."""
    try:
        log_file = log_file_for_message(message)
        log_line = "{0:s}\t{1:s}\tD:{2:s}\tDELETED: {3:s}".format(str(message.timestamp), str(message.author),
                                                                  str(message.id), str(message.content))
        logger.info("{0:s} - {1:s}".format(log_file, log_line))
        with open(log_file, 'a') as log_fd:
            print(log_line, file=log_fd)
    except Exception as ex:
        logger.error("error in creating log line")
        logger.exception(ex)

    # let other stuff happen
    await hitomi.process_commands(message)


@hitomi.event
async def on_message_edit(before, after):
    """Log the message deletion."""
    try:
        log_file = log_file_for_message(after)
        log_line = "{0:s}\t{1:s}\tE:{2:s}\tEDIT: {3:s} (was \"{4:s}\")".format(str(after.timestamp), str(after.author),
                                                                               str(after.id), str(after.content),
                                                                               str(before.content))
        logger.info("{0:s} - {1:s}".format(log_file, log_line))
        with open(log_file, 'a') as log_fd:
            print(log_line, file=log_fd)
    except Exception as ex:
        logger.error("error in creating log line")
        logger.exception(ex)

    # let other stuff happen
    await hitomi.process_commands(after)


def log_file_for_message(message):
    """For the given message, figure out where we'd log the message."""
    if message.channel.is_private:
        log_directory = 'DM/{0:s}/'.format(str(message.author))
        log_file = '{0:s}-{1:s}.log'.format(str(message.author), str(message.timestamp.strftime('%Y%m')))
    else:
        log_directory = '{0:s}-{1:s}/{2:s}/'.format(str(message.server.id), str(message.server),
                                                    str(message.channel))
        log_file = '{0:s}-{1:s}.log'.format(str(message.channel), str(message.timestamp.strftime('%Y%m')))

    destination_dir = '{0:s}/{1:s}'.format(settings.LOGGER_BASE_DIR, log_directory)
    makedirs(destination_dir, exist_ok=True)

    return '{0:s}{1:s}'.format(destination_dir, log_file)