#!/usr/bin/env python3
"""Generate html/js code for hoverable links showing a rendered image"""

import argparse
from pathlib import Path
import re
from typing import Callable

from data import name2set, name2file, name2cardlisting

PATTERN = re.compile(r'\{\{(?P<card>.*?)\}\}')

CSS_STYLE = 'zindex: 100; position: absolute;'

HOVER_JS = \
"""var d = document;
var o=d.getElementById('placeholder-{pid}');
o.src='{img_target}'; o.width=355; o.height=532;
var b = o.getBoundingClientRect();
// make sure the popup image is in the viewport
var w = window;
var up = b.bottom - w.innerHeight;
var left = b.right - w.innerWidth;
if (up > 0) {{
    o.style.top = (b.top - up) + w.pageYOffset + 'px';
}}
if (left > 0) {{
    o.style.left = (b.left - left) +  + w.pageXOffset + 'px';
}}
"""

RESET_JS = \
"""var o=document.getElementById('placeholder-{pid}');
o.src='hover-placeholder.png'; o.width=1; o.height=1;"""

HOVERABLE_LINK = \
f'''<a href="{{link_target}}"
  onmouseover="{HOVER_JS}"
  onmouseout="{RESET_JS}"
>
{{link_text}}
<img src="hover-placeholder.png" id="placeholder-{{pid}}" width=1 height=1 style="{CSS_STYLE}" />
</a>'''

PLACEHOLDER_ID = 0

GenLinkTextCallback = Callable[[str], str]
GenLinkTargetCallback = Callable[[str, str], str]


def gen_hoverable_link(card: str, gen_link_text: GenLinkTextCallback,
                       gen_link_target: GenLinkTargetCallback,
                       images_path: str, language: str) -> str:
    """Return the hoverable link generated for the match

    :param card: the card name
    :param gen_link_text: a Callable returning the link text as string
    :param gen_link_target: a Callable returning the link target as string
    :param images_path: path to where the rendered images are stored
    :param language: the language
    :returns: the code of the hoverable link
    """
    link_text = gen_link_text(card)

    link_target = gen_link_target(card, language)

    cannonical_name = name2file(card)
    card_img = f'{images_path}/{language}/{name2set(cannonical_name)}/{cannonical_name}.png'

    global PLACEHOLDER_ID  # pylint: disable=W0603
    placeholder_id = PLACEHOLDER_ID
    PLACEHOLDER_ID += 1

    return HOVERABLE_LINK.format(link_target=link_target,
                                 pid=placeholder_id,
                                 img_target=card_img,
                                 link_text=link_text)


def gen_link_to_cardlisting(card: str, language: str) -> str:
    """Return the link to a card in the card listing"""

    card_listing_target = name2cardlisting(card)
    return f'{language}/cards_listing.html#{card_listing_target}'


def replace_all_links(string: str, images_path: str, language='en') -> str:
    """Replace a document containing all included cards"""

    gen_link_text = lambda card: f'<em>{card}</em>'
    sub_func = lambda match: gen_hoverable_link(match.group(
        'card'), gen_link_text, gen_link_to_cardlisting, images_path, language)

    return re.sub(PATTERN, sub_func, string)


def main():
    """Generate one standalone tikz picture for each card in the input data"""

    parser = argparse.ArgumentParser(
        description='generate decks from deck descriptions')
    parser.add_argument('markdown_file',
                        help='file in which links should be replaced',
                        nargs='?')
    parser.add_argument('--language',
                        choices=['en', 'de'],
                        default='en',
                        help='the language of the cards to output')
    parser.add_argument('--images',
                        default='/muhqs-game/html/build/latex-build',
                        type=str,
                        help='the path to the rendered cards')

    args = parser.parse_args()

    if args.markdown_file:
        markdown_path = Path(args.markdown_file)

        with open(markdown_path, 'r', encoding="utf8") as markdown_file:
            content = markdown_file.read()
    else:
        content = input()

    print(replace_all_links(content, args.images, language=args.language))


if __name__ == '__main__':
    main()