# Copyright: Ankitects Pty Ltd and contributors
# License: GNU AGPL, version 3 or later; http://www.gnu.org/licenses/agpl.html

"""
This file contains code that is no longer used by Anki, but left around
for the benefit of add-ons. It may go away in the future, so please copy
any routines you need into your own add-on instead of using them directly
from this module.

If your add-on was previously calling anki.template.render(), you now
need to call anki.template.render_template(), passing col in as the first
argument.
"""

from __future__ import annotations

import re
from typing import Any, Callable

from anki.lang import _
from anki.template import (
    CLOZE_REGEX_MATCH_GROUP_CONTENT,
    CLOZE_REGEX_MATCH_GROUP_HINT,
    CLOZE_REGEX_MATCH_GROUP_TAG,
    clozeReg,
)
from anki.utils import stripHTML

# Cloze filter
##########################################################################


def _clozeText(txt: str, ord: str, type: str) -> str:
    """Process the given Cloze deletion within the given template."""
    reg = clozeReg
    currentRegex = clozeReg % ord
    if not re.search(currentRegex, txt):
        # No Cloze deletion was found in txt.
        return ""
    txt = _removeFormattingFromMathjax(txt, ord)

    def repl(m):
        # replace chosen cloze with type
        if type == "q":
            if m.group(CLOZE_REGEX_MATCH_GROUP_HINT):
                buf = "[%s]" % m.group(CLOZE_REGEX_MATCH_GROUP_HINT)
            else:
                buf = "[...]"
        else:
            buf = m.group(CLOZE_REGEX_MATCH_GROUP_CONTENT)
        # uppercase = no formatting
        if m.group(CLOZE_REGEX_MATCH_GROUP_TAG) == "c":
            buf = "<span class=cloze>%s</span>" % buf
        return buf

    txt = re.sub(currentRegex, repl, txt)
    # and display other clozes normally
    return re.sub(reg % r"\d+", "\\2", txt)


def _removeFormattingFromMathjax(txt, ord) -> str:
    """Marks all clozes within MathJax to prevent formatting them.

    Active Cloze deletions within MathJax should not be wrapped inside
    a Cloze <span>, as that would interfere with MathJax.

    This method finds all Cloze deletions number `ord` in `txt` which are
    inside MathJax inline or display formulas, and replaces their opening
    '{{c123' with a '{{C123'. The clozeText method interprets the upper-case
    C as "don't wrap this Cloze in a <span>".
    """
    creg = clozeReg.replace("(?si)", "")

    # Scan the string left to right.
    # After a MathJax opening - \( or \[ - flip in_mathjax to True.
    # After a MathJax closing - \) or \] - flip in_mathjax to False.
    # When a Cloze pattern number `ord` is found and we are in MathJax,
    # replace its '{{c' with '{{C'.
    #
    # TODO: Report mismatching opens/closes - e.g. '\(\]'
    # TODO: Report errors in this method better than printing to stdout.
    # flags in middle of expression deprecated
    in_mathjax = False

    def replace(match):
        nonlocal in_mathjax
        if match.group("mathjax_open"):
            if in_mathjax:
                print("MathJax opening found while already in MathJax")
            in_mathjax = True
        elif match.group("mathjax_close"):
            if not in_mathjax:
                print("MathJax close found while not in MathJax")
            in_mathjax = False
        elif match.group("cloze"):
            if in_mathjax:
                return match.group(0).replace(
                    "{{c{}::".format(ord), "{{C{}::".format(ord)
                )
        else:
            print("Unexpected: no expected capture group is present")
        return match.group(0)

    # The following regex matches one of:
    #  -  MathJax opening
    #  -  MathJax close
    #  -  Cloze deletion number `ord`
    return re.sub(
        r"(?si)"
        r"(?P<mathjax_open>\\[([])|"
        r"(?P<mathjax_close>\\[\])])|"
        r"(?P<cloze>" + (creg % ord) + ")",
        replace,
        txt,
    )


def _cloze_filter(field_text: str, filter_args: str, q_or_a: str):
    return _clozeText(field_text, filter_args, q_or_a)


def cloze_qfilter(field_text: str, filter_args: str, *args):
    return _cloze_filter(field_text, filter_args, "q")


def cloze_afilter(field_text: str, filter_args: str, *args):
    return _cloze_filter(field_text, filter_args, "a")


# addHook("fmod_cq", cloze_qfilter)
# addHook("fmod_ca", cloze_afilter)

# Other filters
##########################################################################


def hint_filter(txt: str, args, context, tag: str, fullname) -> str:
    if not txt.strip():
        return ""
    # random id
    domid = "hint%d" % id(txt)
    return """
<a class=hint href="#"
onclick="this.style.display='none';document.getElementById('%s').style.display='block';return false;">
%s</a><div id="%s" class=hint style="display: none">%s</div>
""" % (
        domid,
        _("Show %s") % tag,
        domid,
        txt,
    )


FURIGANA_RE = r" ?([^ >]+?)\[(.+?)\]"
RUBY_REPL = r"<ruby><rb>\1</rb><rt>\2</rt></ruby>"


def replace_if_not_audio(repl: str) -> Callable[[Any], Any]:
    def func(match):
        if match.group(2).startswith("sound:"):
            # return without modification
            return match.group(0)
        else:
            return re.sub(FURIGANA_RE, repl, match.group(0))

    return func


def without_nbsp(s: str) -> str:
    return s.replace("&nbsp;", " ")


def kanji_filter(txt: str, *args) -> str:
    return re.sub(FURIGANA_RE, replace_if_not_audio(r"\1"), without_nbsp(txt))


def kana_filter(txt: str, *args) -> str:
    return re.sub(FURIGANA_RE, replace_if_not_audio(r"\2"), without_nbsp(txt))


def furigana_filter(txt: str, *args) -> str:
    return re.sub(FURIGANA_RE, replace_if_not_audio(RUBY_REPL), without_nbsp(txt))


def text_filter(txt: str, *args) -> str:
    return stripHTML(txt)


def type_answer_filter(txt: str, filter_args: str, context, tag: str, dummy) -> str:
    # convert it to [[type:...]] for the gui code to process
    if filter_args:
        return f"[[type:{filter_args}:{tag}]]"
    else:
        return f"[[type:{tag}]]"


# addHook("fmod_text", text_filter)
# addHook("fmod_type", type_answer_filter)
# addHook("fmod_hint", hint_filter)
# addHook("fmod_kanji", kanji_filter)
# addHook("fmod_kana", kana_filter)
# addHook("fmod_furigana", furigana_filter)