import traceback
import html
import json
import logging
import re
import more_itertools as mit

from telegram import (
    Update,
    ReplyParameters,
    ReplyKeyboardMarkup,
    ReplyKeyboardRemove,
    KeyboardButton,
    InlineKeyboardMarkup,
    InlineKeyboardButton,
)
from telegram.ext import (
    ApplicationBuilder,
    CommandHandler,
    MessageHandler,
    CallbackQueryHandler,
    CallbackContext,
    ContextTypes,
    filters,
)
from telegram.constants import ParseMode

from django.conf import settings
from django.urls import reverse

from .apps import TgBotUpdater
from .models import TgItem, TmcElement, TmcField
from tmc.models import CustomTable, BaseCustomField


logger = logging.getLogger(__name__)


def chunk(n, l):
    return [l[i : i + n] for i in range(0, len(l), n)]


class TgBot:
    _app = None

    def __init__(self) -> None:
        self.token = settings.TGBOT["TOKEN"]
        self.baseurl = settings.TGBOT["BASE_URL"]
        self.webhook = settings.TGBOT["WEBHOOK_URL"]

        if not self.token or not self.baseurl:
            raise Exception("no token or baseurl")
        TgBot.app = (
            ApplicationBuilder().token(settings.TGBOT["TOKEN"]).updater(None).build()
        )

    async def set_webhook(self):
        await TgBot.app.bot.setWebhook(
            f"https://{self.baseurl}{reverse('tgitem-send-tg-data')}", drop_pending_updates=True
        )

    async def start_app(self):
        await TgBot.app.initialize()

    async def admin_action(self, name, queryset):
        if name == 'admin_get_image':
            async for item in queryset:
                try:
                    text = await TgBot.app.bot.get_file(item.text)
                    TgBotUpdater.return_values[item.text] = text.file_path
                except Exception as e:
                    TgBotUpdater.return_values[item.text] = None
        if name == 'admin_get_name':
            item = queryset[0]
            try:
                text = await TgBot.app.bot.get_chat(item)
                TgBotUpdater.return_values[item] = text.effective_name
            except Exception as e:
                TgBotUpdater.return_values[item] = None

    async def set_handlers(self):
        TgBot.app.add_handler(
            CommandHandler("start", self.start, filters.ChatType.PRIVATE)
        )
        TgBot.app.add_handler(CommandHandler("my", self.my, filters.ChatType.PRIVATE))
        TgBot.app.add_handler(CommandHandler("inv", self.inv, filters.ChatType.PRIVATE))
        TgBot.app.add_handler(MessageHandler(filters.ChatType.PRIVATE, self.inv))
        TgBot.app.add_handler(CallbackQueryHandler(self.get_inv, r"get_inv@(.*?)"))
        TgBot.app.add_handler(CallbackQueryHandler(self.add_tmc, r"add_tmc@(.*?)"))
        TgBot.app.add_handler(
            CallbackQueryHandler(self.add_element, r"add_element@(.*?)")
        )
        TgBot.app.add_error_handler(self.error_handler)

    async def start(self, update: Update, context: CallbackContext):
        await update.message.reply_markdown_v2(
            (
                "Это бот для проведения инвентаризации\n"
                "/my \-\- продолжить инвентаризацию\n"
                "/inv \-\- начать новую инвентаризацию"
            ),
            # reply_markup=ForceReply(selective=True),
            reply_parameters=ReplyParameters(message_id=update.message.message_id),
        )

    async def my(self, update: Update, context: CallbackContext):
        user = update.effective_user
        current_step = context.chat_data.get("step", None)
        logger.info(f"Step {current_step} from user {user.full_name}")

        inv = []
        async for e in TgItem.objects.filter(user_id=user.id):
            inv.append({"name": e.name, "id": str(e.id)})
        keys = chunk(1, inv)
        if len(inv) > 0:
            await update.message.reply_markdown_v2(
                ("Ваши инвентаризации"),
                reply_markup=InlineKeyboardMarkup(
                    [
                        [
                            InlineKeyboardButton(
                                i["name"],
                                callback_data=f'get_inv@{i["id"]}',
                            )
                            for i in arr
                        ]
                        for arr in keys
                    ]
                ),
                reply_parameters=ReplyParameters(message_id=update.message.message_id),
            )
        else:
            await update.message.reply_markdown_v2(
                "У вас нет доступных для редактирования инвентаризаций"
            )

    async def format_text(self, user, inv=None, tmc=None):
        text = (
                    f"Специалист {user.full_name}, ID {user.id}\n"
                    f"Введите название объекта"
                ),

    async def get_inv(self, update: Update, context: CallbackContext):
        query = update.callback_query
        await update.effective_message.edit_reply_markup(InlineKeyboardMarkup([]))
        await query.answer()

        inv_id = query.data.split("@")[-1]
        inv = await TgItem.objects.aget(id=inv_id)

        context.chat_data["inv"] = inv.id
        context.chat_data["step"] = "name"

        await self.inv(update, context)

    async def add_tmc(self, update: Update, context: CallbackContext):
        query = update.callback_query
        if update.callback_query:
            await update.effective_message.edit_reply_markup(InlineKeyboardMarkup([]))
            await query.answer()

        tmc_id = query.data.split("@")[-1]
        tmc = await CustomTable.objects.aget(id=tmc_id)
        tmc_element = await TmcElement.objects.acreate(tmc=tmc)
        inv = await TgItem.objects.aget(id=context.chat_data["inv"])

        async for f in tmc.fields.all():
            tmc_field = await TmcField.objects.acreate(field=f)
            await tmc_element.field.aadd(tmc_field)

        await inv.tmc.aadd(tmc_element)

        context.chat_data["tmc"] = tmc_element.id
        context.chat_data["step"] = "add_tmc"

        await self.inv(update, context)

    async def add_element(self, update: Update, context: CallbackContext):
        query = update.callback_query
        if update.callback_query:
            await update.effective_message.edit_reply_markup(InlineKeyboardMarkup([]))
            await query.answer()

        inv = await TgItem.objects.aget(id=context.chat_data["inv"])
        tmc = await inv.tmc.aget(id=context.chat_data["tmc"])

        field_id = query.data.split("@")[-1]
        tmc_field = await tmc.field.aget(id=field_id)

        context.chat_data["element"] = tmc_field.id
        context.chat_data["step"] = "add_element"

        await self.inv(update, context)

    async def inv(self, update: Update, context: CallbackContext):
        user = update.effective_user
        current_step = context.chat_data.get("step", None)

        logger.info(
            f"Step {current_step} from user {user.full_name} in {update.message}"
        )

        if update.effective_message.text == "/inv":
            context.chat_data["step"] = "name"
            await update.effective_message.reply_markdown_v2(
                (
                    f"Специалист {user.name or user.full_name}, ID {user.id}\n"
                    f"Введите название объекта"
                ),
                reply_parameters=ReplyParameters(
                    message_id=update.effective_message.message_id
                ),
            )

        elif current_step == "name":
            if not context.chat_data.get("inv", None):
                inv = await TgItem.objects.acreate(user_id=user.id)
                inv.name = update.message.text
                await inv.asave()
            else:
                inv = await TgItem.objects.aget(id=context.chat_data["inv"])

            tmc = []
            async for e in CustomTable.objects.all():
                tmc.append({"name": e.name, "id": e.id})
            keys = chunk(2, tmc)

            context.chat_data["inv"] = inv.id
            context.chat_data["step"] = "add_tmc"

            await update.effective_message.reply_markdown_v2(
                (
                    f"Инвентаризация `{inv.name}` от `{inv.created_at.strftime('%x')}`\n"
                    f"Количество ТМЦ {await inv.tmc.acount()}\n\n"
                    "Выберите, какую ТМЦ вы осматриваете:"
                ),
                reply_parameters=ReplyParameters(
                    message_id=update.effective_message.message_id
                ),
                reply_markup=InlineKeyboardMarkup(
                    [
                        [
                            InlineKeyboardButton(
                                i["name"],
                                callback_data=f'{context.chat_data["step"]}@{i["id"]}',
                            )
                            for i in arr
                        ]
                        for arr in keys
                    ]
                ),
            )

        elif current_step == "add_tmc":
            inv = await TgItem.objects.aget(id=context.chat_data["inv"])
            tmc_element = await inv.tmc.aget(id=context.chat_data["tmc"])
            tmc = await CustomTable.objects.aget(id=tmc_element.tmc_id)

            fields = []
            async for e in tmc_element.field.filter(text=None):
                f = await BaseCustomField.objects.aget(id=e.field_id)
                fields.append({"name": f.name, "id": e.id})
            keys = chunk(1, fields)

            context.chat_data["tmc"] = tmc_element.id
            context.chat_data["step"] = "add_element"

            await update.effective_message.reply_markdown_v2(
                (
                    f"Инвентаризация `{inv.name}` от `{inv.created_at.strftime('%x')}`\n"
                    f"Количество ТМЦ {await inv.tmc.acount()}\n\n"
                    f"Название ТМЦ `{tmc.name}`\n"
                    f"Что вы загружаете?"
                ),
                reply_parameters=ReplyParameters(
                    message_id=update.effective_message.message_id
                ),
                reply_markup=InlineKeyboardMarkup(
                    [
                        [
                            InlineKeyboardButton(
                                i["name"],
                                callback_data=f'{context.chat_data["step"]}@{i["id"]}',
                            )
                            for i in arr
                        ]
                        for arr in keys
                    ]
                ),
            )

        elif current_step == "add_element":
            inv = await TgItem.objects.aget(id=context.chat_data["inv"])
            tmc = await inv.tmc.aget(id=context.chat_data["tmc"])
            element = await TmcField.objects.aget(id=context.chat_data["element"])
            field = await BaseCustomField.objects.aget(id=element.field_id)

            context.chat_data["step"] = "add_element_data"
            await update.effective_message.reply_markdown_v2(
                (
                    f"Инвентаризация `{inv.name}` от `{inv.created_at.strftime('%x')}`\n"
                    f"Количество ТМЦ {await inv.tmc.acount()}\n\n"
                    f"Название ТМЦ `{tmc.name}`\n"
                    f"Элемент `{field.name}`\n"
                    f"Загрузите фото или пришлите текст"
                ),
                reply_parameters=ReplyParameters(
                    message_id=update.effective_message.message_id
                ),
                reply_markup=ReplyKeyboardRemove(),
            )
        elif current_step == "add_element_data":
            inv = await TgItem.objects.aget(id=context.chat_data["inv"])
            tmc_element = await inv.tmc.aget(id=context.chat_data["tmc"])
            tmc = await CustomTable.objects.aget(id=tmc_element.tmc_id)
            element = await TmcField.objects.aget(id=context.chat_data["element"])
            field = await BaseCustomField.objects.aget(id=element.field_id)

            if update.message.photo:
                element.text = update.message.photo[-1].file_id
            elif update.message.text:
                element.text = update.message.text

            await element.asave()
            
            empty_fields = await tmc_element.field.filter(text=None).acount()
            if empty_fields > 0:
                context.chat_data["step"] = "add_tmc"
                await self.inv(update, context)
            else:
                context.chat_data["step"] = "name"
                await self.inv(update, context)

        else:
            logger.info(update.message.entities)
            logger.info(f"no step for update {update}")

        if "step" in context.chat_data and context.chat_data["step"] == current_step:
            context.chat_data["step"] = None
            context.chat_data["inv"] = None

    async def error_handler(
        self, update: object, context: ContextTypes.DEFAULT_TYPE
    ) -> None:
        """Log the error and send a telegram message to notify the developer."""
        # Log the error before we do anything else, so we can see it even if something breaks.
        # logger.error("Exception while handling an update:", exc_info=context.error)

        # traceback.format_exception returns the usual python message about an exception, but as a
        # list of strings rather than a single string, so we have to join them together.
        tb_list = traceback.format_exception(
            None, context.error, context.error.__traceback__
        )
        tb_string = "".join(tb_list)

        # Build the message with some markup and additional information about what happened.
        # You might need to add some logic to deal with messages longer than the 4096 character limit.
        update_str = update.to_dict() if isinstance(update, Update) else str(update)
        message = (
            "An exception was raised while handling an update\n"
            f"<pre>update = {html.escape(json.dumps(update_str, indent=2, ensure_ascii=False))}"
            "</pre>\n\n"
            f"<pre>context.chat_data = {html.escape(str(context.chat_data))}</pre>\n\n"
            f"<pre>context.user_data = {html.escape(str(context.user_data))}</pre>\n\n"
            f"<pre>{html.escape(tb_string)}</pre>"
        )
        # logger.error(context.error)
        logger.info(f"error in tgbot {context.error}\n{tb_string}\nReply update")