import os
import logging
from io import BytesIO

from PIL import Image
from dotenv import load_dotenv
from telegram import Update, InlineKeyboardMarkup, InlineKeyboardButton, Message
from telegram.error import TelegramError
from telegram.ext import ApplicationBuilder, CallbackQueryHandler, CommandHandler, MessageHandler, \
    PicklePersistence, filters, PersistenceInput, ContextTypes

from .api import get_random_image
from .constants import format_chat, get_localized_string as l, format_author, format_lang, langs, get_lang, lang_markup
from .effects import img_to_bio, tt_bt_effect, bt_effect, splash_effect, wot_effect, text_effect
from .slot import spin, autospin, bet, cash

load_dotenv()
logging.basicConfig(format='%(asctime)s - %(name)s - %(levelname)s - %(message)s', level=logging.INFO)


async def _get_message_content(message):
    image = None
    if len(message.photo) > 0:
        p = message.photo[-1]
        i = await p.get_file()
        d = await i.download_as_bytearray()
        image = Image.open(BytesIO(d))

    content = ""
    if message.text is not None:
        content = message.text.strip()
    elif message.caption is not None:
        content = message.caption.strip()

    lines = content.split("\n")
    r = lines[0].split(" ")

    try:
        if r[0][0] == '/':
            r.pop(0)
    except IndexError:
        pass

    lines[0] = " ".join(r)
    content = "\n".join(lines)

    return image, content, _get_author(message)


async def _get_reply(message, fallback=""):
    if message is None:
        return None, fallback, None

    image, content, author = await _get_message_content(message)

    return image, content, author


def _get_lewd(context):
    try:
        return context.chat_data["lewd"]
    except KeyError:
        return False


def _get_image(context):
    if context is not None:
        image, url = get_random_image(_get_lewd(context))

    if image is None:
        logging.warning("Getting Image failed")
        raise TelegramError("bad image")

    markup = InlineKeyboardMarkup([[InlineKeyboardButton(text=l("sauce", context), url=url)]])

    return image, markup


async def _get_all(update, check_fn, context):
    image_reply, text_reply, author_reply = await _get_reply(update.message.reply_to_message)
    image_content, text_content, author_content = await _get_message_content(update.message)

    info_struct = {
        "reply": {
            "author": author_reply,
            "text": text_reply,
            "image": image_reply
        },
        "content": {
            "author": author_content,
            "text": text_content,
            "image": image_content
        }
    }

    logging.info(
        f"User {update.message.from_user.full_name}{f' (@{update.message.from_user.username})' if update.message.from_user.username is not None else ''} typed: {str(update.message.text)}")

    content = check_fn(info_struct)

    if content is None:
        return None, None, None

    markup = ""
    image = None

    if image_reply is not None:
        image = image_reply

    if image_content is not None:
        image = image_content

    if image is None:
        image, markup = _get_image(context)

    return content, image, markup


async def start(update: Update, context: ContextTypes.DEFAULT_TYPE):
    await update.message.reply_text(l("welcome", context))


async def set_lewd(update: Update, context: ContextTypes.DEFAULT_TYPE):
    try:
        output = False if context.chat_data["lewd"] else True
    except KeyError:
        output = True

    context.chat_data['lewd'] = output
    message = l("lewd_toggle", context).format(l("enabled", context) if output else l("disabled", context))
    return await update.message.reply_text(message)


async def pic(update: Update, context: ContextTypes.DEFAULT_TYPE):
    image, markup = _get_image(context)
    return await update.message.reply_photo(photo=img_to_bio(image), parse_mode="markdown", reply_markup=markup)


def _get_author(message: Message):
    origin = message.forward_origin
    
    if origin is None: # message was not forwarded
        return format_author(message.from_user)
    
    try:
        return format_author(origin['sender_user']) # MessageOriginUser
    except KeyError:
        pass
    
    try:
        return origin['sender_user_name'] # MessageOriginHiddenUser
    except KeyError:
        pass
    
    try:
        return format_chat(origin['sender_chat']) # MessageOriginChat
    except KeyError:
        pass
    try:
        return format_chat(origin['chat']) # MessageOriginChannel
    except KeyError:
        pass
    
    logging.warn("Message was forwarded but I couldn't detect the original author.")
    return format_author(message.from_user)


def tt_check(info):
    reply = info['reply']['text']
    content = info['content']['text']

    input_text = f"{reply} {content}".replace("\n", " ")

    if input_text.strip() == "":
        return None

    return input_text


def ttbt_check(info):
    reply = info['reply']['text'].strip()
    content = info['content']['text'].strip()

    if len(content.split("\n")) > 1:
        input_text = content
    else:
        input_text = f"{reply}\n{content}"

    if input_text.strip() == "":
        return None

    return input_text


def splash_check(info):
    reply = info['reply']['text']
    content = info['content']['text']

    if content.strip() == "":
        author = info['reply']['author']
        input_text = f"{author}\n{reply}"
    else:
        author = info['content']['author']
        input_text = f"{author}\n{content}"

    if len(input_text.strip().split("\n")) < 2:
        return None

    return input_text


def wot_check(info):
    reply = info['reply']['text']
    content = info['content']['text']

    input_text = f"{reply}\n{content}"

    if input_text.strip() == "":
        return None

    return input_text


async def ttbt(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, ttbt_check, context)

    if image is None:
        return await update.message.reply_text(l("no_caption", context))

    image = tt_bt_effect(content, image)

    if image is None:
        return await update.message.reply_text(l("failed_effect", context))

    return await update.message.reply_photo(photo=image, reply_markup=markup)


async def tt(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, tt_check, context)

    if image is None:
        return await update.message.reply_text(l("no_caption", context))

    image = tt_bt_effect(content, image)

    if image is None:
        return await update.message.reply_text(l("failed_effect", context))

    return await update.message.reply_photo(photo=image, reply_markup=markup)


async def bt(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, tt_check, context)

    if image is None:
        return await update.message.reply_text(l("no_caption", context))

    image = bt_effect(content, image)

    if image is None:
        return await update.message.reply_text(l("failed_effect", context))

    return await update.message.reply_photo(photo=image, reply_markup=markup)


async def splash(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, splash_check, context)

    if image is None:
        return await update.message.reply_text(l("no_caption", context))

    image = splash_effect(content, image)

    if image is None:
        return await update.message.reply_text(l("failed_effect", context))

    return await update.message.reply_photo(photo=image, reply_markup=markup)


async def wot(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, wot_check, context)

    if image is None:
        return await update.message.reply_text(l("no_caption", context))

    image = wot_effect(content, image)

    if image is None:
        await update.message.reply_text(l("failed_effect", context))

    await update.message.reply_photo(photo=image, reply_markup=markup)


async def text(update: Update, context: ContextTypes.DEFAULT_TYPE):
    content, image, markup = await _get_all(update, wot_check, context)

    if image is None:
        await update.message.reply_text(l("no_caption", context))
        return

    image = text_effect(content, image)

    if image is None:
        await update.message.reply_text(l("failed_effect", context))

    await update.message.reply_photo(photo=image, reply_markup=markup)


async def caps(update: Update, context: ContextTypes.DEFAULT_TYPE):
    _, reply, _ = await _get_reply(update.message.reply_to_message, ' '.join(context.args))
    await update.message.reply_text(reply.upper())


async def _set_lang(update: Update, context: ContextTypes.DEFAULT_TYPE, lang: str):
    context.chat_data["lang"] = lang
    response = l("language_set", context).format(format_lang(lang))
    await update.message.reply_text(response)


async def lang(update: Update, context: ContextTypes.DEFAULT_TYPE):
    try:
        selected = str(context.args[0])
    except IndexError:
        selected = None

    if selected is None:
        lang = format_lang(get_lang(context))
        choices = ", ".join(langs) + "."
        return await update.message.reply_text(text=l("current_language", context).format(lang, choices),
                                               reply_markup=lang_markup)

    if selected not in langs:
        return await update.message.reply_text(text=l("invalid_language", context))

    return await _set_lang(update, context, selected)


def unknown(update: Update, context: ContextTypes.DEFAULT_TYPE):
    logging.info(f"User {update.message.from_user.full_name} sent {update.message.text_markdown_v2} and I don't know what that means.")


async def error_callback(update: Update, context: ContextTypes.DEFAULT_TYPE):
    try:
        raise context.error
    except TelegramError as e:
        logging.error("TelegramError! " + str(e))
        await update.message.reply_text(l('error', context))


def _add_effect_handler(application: ApplicationBuilder, command: str, callback):
    application.add_handler(CommandHandler(command, callback))
    application.add_handler(MessageHandler(filters.Caption([f"/{command}"]), callback))


async def keyboard_handler(update: Update, context: ContextTypes.DEFAULT_TYPE):
    query = update.callback_query
    data = query.data

    if data.startswith("reroll"):
        amount = int(data.split(" ")[1])

        if amount <= 1:
            return await spin(update, context)
        return await autospin(context, update.effective_chat.id, amount)

    match data:
        case "none":
            return query.answer(l("none_callback", context))
        case "set_lang_en":
            lang = "en"
            await _set_lang(update, context, lang)
            return await query.answer(l("language_set", context).format(format_lang(lang)))
        case "set_lang_it":
            lang = "it"
            await _set_lang(update, context, lang)
            return await query.answer(l("language_set", context).format(format_lang(lang)))
        case other:
            logging.error(f"unknown callback: {data}")

    return await query.answer()


def main():
    token = os.getenv("token")
    pers = PersistenceInput(bot_data=False, callback_data=False)
    persistence = PicklePersistence(filepath='bot-data.pkl', store_data=pers)

    application = ApplicationBuilder().token(token).persistence(persistence).build()

    application.add_error_handler(error_callback)
    application.add_handler(CallbackQueryHandler(callback=keyboard_handler))

    # commands
    application.add_handler(CommandHandler('start', start))
    application.add_handler(CommandHandler('lang', lang))
    application.add_handler(CommandHandler('lewd', set_lewd))
    application.add_handler(CommandHandler('caps', caps))
    application.add_handler(CommandHandler('pic', pic))

    # effects
    _add_effect_handler(application, 'ttbt', ttbt)
    _add_effect_handler(application, 'tt', tt)
    _add_effect_handler(application, 'bt', bt)
    _add_effect_handler(application, 'splash', splash)
    _add_effect_handler(application, 'wot', wot)
    _add_effect_handler(application, 'text', text)

    # games
    application.add_handler(CommandHandler('spin', spin))
    application.add_handler(CommandHandler('bet', bet))
    application.add_handler(CommandHandler('cash', cash))

    # fallback
    application.add_handler(MessageHandler(filters.COMMAND, unknown))
    application.run_polling()


if __name__ == "__main__":
    main()