# <============================================== IMPORTS =========================================================>
from datetime import datetime, timedelta
from html import escape
from re import compile as compile_re
from typing import List

from pyrogram.enums import ChatType
from pyrogram.types import Message

from Mikobot.utils.parser import escape_markdown

TIME_ZONE = "Asia/Kolkata"
BTN_URL_REGEX = compile_re(r"(\[([^\[]+?)\]\(buttonurl:(?:/{0,2})(.+?)(:same)?\))")
# <=======================================================================================================>


# <================================================ FUNCTION =======================================================>
async def extract_time(m: Message, time_val: str):
    """Extract time from message."""
    if any(time_val.endswith(unit) for unit in ("m", "h", "d")):
        unit = time_val[-1]
        time_num = time_val[:-1]  # type: str
        if not time_num.isdigit():
            await m.reply("Unspecified amount of time.")
            return ""
        initial_time = datetime.now(TIME_ZONE)
        if unit == "m":
            bantime = initial_time + timedelta(minutes=int(time_num))
        elif unit == "h":
            bantime = initial_time + timedelta(hours=int(time_num))
        elif unit == "d":
            bantime = initial_time + timedelta(days=int(time_num))
        else:
            # how even...?
            return ""
        return bantime
    await m.reply(
        f"Invalid time type specified. Needed m, h, or s. got: {time_val[-1]}",
    )
    return ""


async def parse_button(text: str):
    """Parse button from text."""
    markdown_note = text
    prev = 0
    note_data = ""
    buttons = []
    for match in BTN_URL_REGEX.finditer(markdown_note):
        # Check if btnurl is escaped
        n_escapes = 0
        to_check = match.start(1) - 1
        while to_check > 0 and markdown_note[to_check] == "\\":
            n_escapes += 1
            to_check -= 1

        # if even, not escaped -> create button
        if n_escapes % 2 == 0:
            # create a thruple with button label, url, and newline status
            buttons.append((match.group(2), match.group(3), bool(match.group(4))))
            note_data += markdown_note[prev : match.start(1)]
            prev = match.end(1)
        # if odd, escaped -> move along
        else:
            note_data += markdown_note[prev:to_check]
            prev = match.start(1) - 1
    else:
        note_data += markdown_note[prev:]
    return note_data, buttons


async def build_keyboard(buttons):
    """Build keyboards from provided buttons."""
    keyb = []
    for btn in buttons:
        if btn[-1] and keyb:
            keyb[-1].append((btn[0], btn[1], "url"))
        else:
            keyb.append([(btn[0], btn[1], "url")])

    return keyb


SMART_OPEN = "“"
SMART_CLOSE = "”"
START_CHAR = ("'", '"', SMART_OPEN)


async def escape_invalid_curly_brackets(text: str, valids: List[str]) -> str:
    new_text = ""
    idx = 0
    while idx < len(text):
        if text[idx] == "{":
            if idx + 1 < len(text) and text[idx + 1] == "{":
                idx += 2
                new_text += "{{{{"
                continue
            success = False
            for v in valids:
                if text[idx:].startswith("{" + v + "}"):
                    success = True
                    break
            if success:
                new_text += text[idx : idx + len(v) + 2]
                idx += len(v) + 2
                continue
            new_text += "{{"

        elif text[idx] == "}":
            if idx + 1 < len(text) and text[idx + 1] == "}":
                idx += 2
                new_text += "}}}}"
                continue
            new_text += "}}"

        else:
            new_text += text[idx]
        idx += 1

    return new_text


async def escape_mentions_using_curly_brackets(
    m: Message,
    text: str,
    parse_words: list,
) -> str:
    if m.chat.type in [ChatType.SUPERGROUP, ChatType.GROUP, ChatType.CHANNEL]:
        chat_name = escape(m.chat.title)
    else:
        chat_name = escape(m.from_user.first_name)
    teks = await escape_invalid_curly_brackets(text, parse_words)
    if teks:
        teks = teks.format(
            first=escape(m.from_user.first_name),
            last=escape(m.from_user.last_name or m.from_user.first_name),
            mention=m.from_user.mention,
            username=(
                "@" + (await escape_markdown(escape(m.from_user.username)))
                if m.from_user.username
                else m.from_user.mention
            ),
            fullname=" ".join(
                [
                    escape(m.from_user.first_name),
                    escape(m.from_user.last_name),
                ]
                if m.from_user.last_name
                else [escape(m.from_user.first_name)],
            ),
            chatname=chat_name,
            id=m.from_user.id,
        )
    else:
        teks = ""

    return teks


async def split_quotes(text: str):
    """Split quotes in text."""
    if not any(text.startswith(char) for char in START_CHAR):
        return text.split(None, 1)
    counter = 1  # ignore first char -> is some kind of quote
    while counter < len(text):
        if text[counter] == "\\":
            counter += 1
        elif text[counter] == text[0] or (
            text[0] == SMART_OPEN and text[counter] == SMART_CLOSE
        ):
            break
        counter += 1
    else:
        return text.split(None, 1)

    # 1 to avoid starting quote, and counter is exclusive so avoids ending
    key = await remove_escapes(text[1:counter].strip())
    # index will be in range, or `else` would have been executed and returned
    rest = text[counter + 1 :].strip()
    if not key:
        key = text[0] + text[0]
    return list(filter(None, [key, rest]))


async def remove_escapes(text: str) -> str:
    """Remove the escaped from message."""
    res = ""
    is_escaped = False
    for counter in range(len(text)):
        if is_escaped:
            res += text[counter]
            is_escaped = False
        elif text[counter] == "\\":
            is_escaped = True
        else:
            res += text[counter]
    return res


# <================================================ END =======================================================>