# paperdoorknob: Print glowfic
#
# This program is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by the
# Free Software Foundation, version 3.


from argparse import ArgumentParser
from contextlib import contextmanager
import os.path
from sys import stderr

from typing import Iterator

from xdg_base_dirs import xdg_cache_home

from domfilter import ApplyDOMFilters, DOMFilters
from fetch import CachingFetcher
from glowfic import BesideIconLayout, BelowIconLayout, Layout
from htmlfilter import ApplyHTMLFilters, HTMLFilters
from texfilter import ApplyTexFilters, TexFilters
from images import DiskImageStore
from spec import Spec
from texify import PandocTexifier


def _print_status(msg: str) -> None:
    print(msg, file=stderr, end='' if msg.endswith('\r') else '\n')


def _command_line_parser() -> ArgumentParser:
    parser = ArgumentParser(prog='paperdoorknob', description='Print glowfic')
    parser.add_argument(
        '--cache-path',
        metavar='PATH',
        help='Where to keep the http cache (instead of %(default)s)',
        default=os.path.join(xdg_cache_home(), "paperdoorknob"))
    parser.add_argument(
        '--domfilters',
        help='Which DOM filters to use (default: %(default)s)',
        default=','.join(f[0] for f in DOMFilters))
    parser.add_argument(
        '--geometry',
        help='''Page size and margin control
See https://faculty.bard.edu/bloch/geometry.pdf for details
(default: %(default)s)''',
        default='paperwidth=5.5in,paperheight=8.5in,nohead,' +
        'tmargin=15mm,hmargin=15mm,bmargin=17mm,foot=4mm')
    parser.add_argument(
        '--htmlfilters',
        help='Which HTML filters to use (default: %(default)s)',
        default=','.join(f[0] for f in HTMLFilters))
    parser.add_argument(
        '--image-size',
        help='How large the icon images are, in mm',
        default=20)
    parser.add_argument(
        '--layout',
        default='beside',
        help='Whether to put character and author information `beside` or `below` the icon ' +
             '(default: beside)')
    parser.add_argument(
        '--out',
        help='The filename stem at which to write output ' +
             '(eg: "%(default)s" produces %(default)s.tex, %(default)s.pdf, etc.)',
        default='book')
    parser.add_argument('--pandoc', help='Location of the pandoc executable')
    parser.add_argument(
        '--quiet',
        action='store_true',
        help='Suppress progress messages')
    parser.add_argument(
        '--texfilters',
        help='Which TeX filters to use (default: %(default)s)',
        default=','.join(f[0] for f in TexFilters))
    parser.add_argument(
        '--timeout',
        help='How long to wait for HTTP requests, in seconds',
        default=30)
    parser.add_argument(
        'url',
        help='URL to retrieve (example: https://www.projectlawful.com/posts/4582 )')
    return parser


@contextmanager
def spec_from_commandline_args() -> Iterator[Spec]:
    args = _command_line_parser().parse_args()
    texifier = PandocTexifier(args.pandoc or 'pandoc')
    layout: Layout
    if args.layout == 'below':
        layout = BelowIconLayout(texifier, args.image_size)
    elif args.layout == 'beside':
        layout = BesideIconLayout(texifier, args.image_size)
    else:
        raise ValueError(f'Unknown layout: {args.layout}')
    log = (lambda _: None) if args.quiet else _print_status
    with CachingFetcher(args.cache_path, args.timeout, log) as fetcher:
        with open(args.out + '.tex', 'wb') as texout:
            yield Spec(
                args.url,
                fetcher,
                DiskImageStore(args.out + '_images', fetcher),
                lambda x: ApplyHTMLFilters(args.htmlfilters, x),
                lambda x: ApplyDOMFilters(args.domfilters, x),
                lambda x: ApplyTexFilters(args.texfilters, x),
                layout,
                args.geometry,
                texout,
                log)