'''
Command line module for calling toota-palooza to do its work
'''

__all__     = ['toota-palooza']
__author__  = 'Paco Hope <toota-palooza@filter.paco.to>'
__date__    = '25 November 2022'
__version__ = '1.0'
__copyright__ = 'Copyright © 2022 Paco Hope. See LICENSE for details.'

from mastodon import Mastodon
import toml
import os
import time
import argparse
import sys
from pathlib import Path
import random

class Tooter(Mastodon):
    credentials: dict = {}
    hostname: str     = ''
    files: dict       = {}
    client_id: str    = '.toota-palooza.env'

    def __init__(self, name: str):
        self.name = name
        cred_dict = self.credentials[self.name]
        self.username  = cred_dict['addr']
        self.password  = cred_dict['pass']
        self.cred_file = f'.toota-palooza-usercred-{self.name}.env'

        super().__init__(client_id=self.client_id, api_base_url=self.hostname)

        self.log_in(
            self.username,
            self.password,
            to_file=self.cred_file
        )

    @classmethod
    def load_credentials(cls, file: str) -> None:
        as_dict = toml.load(file)
        try:
            cls.hostname = as_dict.pop('host')
        except KeyError:
            raise KeyError('must provide a hostname')
        for username, fields in as_dict.items():
            if not isinstance(fields, dict):
                raise TypeError(f'{username} has no key/value pairs')
            if 'addr' not in fields:
                raise KeyError(f'`addr` field missing from {username}')
            if 'pass' not in fields:
                raise KeyError(f'`pass` field missing from {username}')
        cls.credentials = as_dict

    @classmethod
    def load_src_files(cls, dir: Path) -> None:
        for item in dir.iterdir():
            if not item.is_file():
                continue
            with item.open('r') as f:
                cls.files[f.name] = f.readlines()


def check_public_timeline(tooter: Tooter):
    """Do one run. Connect to the database, connect to the server, get the public timeline.
    Look at users and check to see if any are potential impersonators. Then exit."""

    # Here's the idea: pick a chunk_size. Ask the server for that many toots off the public
    # timeline. As long as the server gives us as many as we asked for, keep trying.
    # as soon as we get less than we asked for, quit.
    #
    # XXX Not sure about rate-limiting
    #
    chunk_size    = 20
    max_posts     = 1000
    timeline_list = []
    userid_list   = {}
    total         = 0
    calls         = 0
    domain_def    = tooter.hostname.split('/')[2]
    while total < max_posts:
        timeline_list = tooter.timeline(timeline='public', limit=chunk_size)
        calls += 1
        for post in timeline_list:
            userid = post.account.acct
            name_and_domain = userid.split('@', 1)
            username = name_and_domain[0]

            if len(name_and_domain) == 2:
                domain = name_and_domain[1]
            else:
                # if there is no domain, then it's a local account
                domain = domain_def
            userid_list[userid] = (username, domain,
                post.account.display_name, post.account.bot, post.url)

        posts_indexed = len(timeline_list)
        if posts_indexed == 0:
            # We got fewer than we asked for. Drop out of the loop.
            break
        total += posts_indexed

    # Ok, we got them all, time to insert
    return (f'{calls} calls to get {total} posts,'
        +f' {len(userid_list)} users processed')

def daemon_main(tooter: Tooter):
    """Run from a command line."""

    while True:
        # do a thing
        time.sleep(600)
    
def once(tooter: Tooter):
    """Run from a command line."""
    # message = check_public_timeline(tooter)
    message = f'{tooter.name} says hi!'
    tooter.toot(
        # random sentence...
        random.choice(
            # from a random line...
            random.choice(
                # from a random file...
                random.choice(
                    list(tooter.files.values())
                )
            )
            # stripped and split on full stops...
            .strip().split('.')
        )
        # and of weird punctuation
        .strip()
    )
    return 0

def main():
    parser = argparse.ArgumentParser(
        description='Randomly interact with a Mastodon timeline.')
    parser.add_argument( '-d', '--debug', action='store_true',
        help='Enable debugging messages.')
    parser.add_argument( '-o', '--once', action='store_true',
        help='Run once and exit. Default is to run as a daemon.')
    parser.add_argument( '-D', '--directory', default='text',
        help='Change directory to source files from.')
    parser.add_argument( 'file', type=argparse.FileType('r'),
        help='Change file to source users from.')
    args = parser.parse_args()

    p = Path(args.directory)
    if not p.exists():
        print(f'{sys.argv[0]}: {args.directory}: No such file or directory', file=sys.stderr)
        return 2
    if not p.is_dir():
        print(f'{sys.argv[0]}: {args.directory}: Is not a directory', file=sys.stderr)
        return 2

    Tooter.load_src_files(p)

    Tooter.load_credentials(args.file)

    if args.once:
        for name in Tooter.credentials:
            t = Tooter(name)
            once(t)
        return 0

    daemon_main(t)

if __name__ == '__main__':
    sys.exit(main())