from typing import Optional, Tuple, List
from aiogram import Router, types
from aiogram.filters import Command
from aiogram.types import (
    InlineKeyboardMarkup,
    InlineKeyboardButton,
    CallbackQuery,
)
import json

from bot import db
from i18n.localization import I18n

router = Router()
i18n = I18n()

LangOption = Tuple[str, str]
PeriodOption = Tuple[str, str]

LANG_OPTIONS: List[LangOption] = [
    ("en", "English"),
    ("ru", "Русский"),
]

PERIOD_OPTIONS: List[PeriodOption] = [
    ("week", "week"),
    ("month", "month"),
    ("quarter", "quarter"),
    ("year", "year"),
]


async def get_user_locale(user_id: int) -> dict:
    data = await db.fetch(
        'SELECT lang FROM users WHERE user_id = $1', user_id
    )
    if not data:
        await db.insert(
            'INSERT INTO users (user_id) VALUES (?)', user_id
        )
        data = await db.fetch(
            'SELECT lang FROM users WHERE user_id = $1', user_id
        )
    return i18n.get_locale(data.get('lang', 'en'))


def build_options_keyboard(
    options: List[Tuple[str, str]],
    current_value: str,
    callback_prefix: str,
    locale: dict,
    buttons_per_row: int = 2,
    back_callback: Optional[str] = None,
) -> InlineKeyboardMarkup:
    buttons: List[List[InlineKeyboardButton]] = []
    row: List[InlineKeyboardButton] = []

    for code, label_key in options:
        label = locale.get(label_key, label_key)
        text = (
            f"[X] {label}" if code == current_value else label
        )
        row.append(
            InlineKeyboardButton(
                text=text, callback_data=f"{callback_prefix}_{code}"
            )
        )
        if len(row) == buttons_per_row:
            buttons.append(row)
            row = []
    if row:
        buttons.append(row)
    if back_callback:
        buttons.append(
            [
                InlineKeyboardButton(
                    text=locale.get("back", "Back"),
                    callback_data=back_callback,
                )
            ]
        )
    return InlineKeyboardMarkup(inline_keyboard=buttons)


def get_chart_toggle_keyboard(
    chart_enabled: bool, locale: dict
) -> InlineKeyboardMarkup:
    toggle_text = (
        locale.get("chart_disable", "Disable Chart")
        if chart_enabled
        else locale.get("chart_enable", "Enable Chart")
    )
    return InlineKeyboardMarkup(
        inline_keyboard=[
            [
                InlineKeyboardButton(
                    text=toggle_text, callback_data="chart_toggle"
                ),
                InlineKeyboardButton(
                    text=locale.get("chart_period", "Chart Period"),
                    callback_data="chart_period",
                ),
                InlineKeyboardButton(
                    text=locale.get("setting_backend", "Chart Backend"),
                    callback_data="setting_backend",
                ),
            ],
            [
                InlineKeyboardButton(
                    text=locale.get("back", "Back"),
                    callback_data="back_to_settings",
                ),
            ],
        ]
    )


def markup_to_json(
    markup: Optional[InlineKeyboardMarkup],
) -> Optional[str]:
    if markup is None:
        return None
    return json.dumps(markup.model_dump(), sort_keys=True)


async def safe_edit_message_text(
    callback: CallbackQuery,
    new_text: str,
    new_reply_markup: Optional[InlineKeyboardMarkup] = None,
    parse_mode: Optional[str] = None,
) -> None:
    message = callback.message
    current_text = (message.text or "").strip()
    new_text_clean = new_text.strip()

    is_text_same = current_text == new_text_clean
    is_markup_same = (
        markup_to_json(message.reply_markup)
        == markup_to_json(new_reply_markup)
    )

    if is_text_same and is_markup_same:
        await callback.answer()
        return

    await message.edit_text(
        new_text, reply_markup=new_reply_markup, parse_mode=parse_mode
    )
    await callback.answer()


@router.message(Command("settings"))
async def settings_handler(message: types.Message):
    locale = await get_user_locale(message.from_user.id)

    settings_keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [
                InlineKeyboardButton(
                    text=locale.get("setting_chart", "Chart Settings"),
                    callback_data="setting_chart",
                ),
                InlineKeyboardButton(
                    text=locale.get("setting_lang", "Language Settings"),
                    callback_data="setting_lang",
                ),
            ],
        ]
    )

    await message.answer(
        locale.get("settings_title", "Settings"),
        reply_markup=settings_keyboard
    )

@router.callback_query(lambda c: c.data == "setting_lang")
async def show_language_menu(callback: CallbackQuery):
    locale = await get_user_locale(callback.from_user.id)

    data = await db.fetch(
        'SELECT lang FROM users WHERE user_id = $1',
        callback.from_user.id
    )
    current_lang = data.get('lang', 'en')

    keyboard = build_options_keyboard(
        options=LANG_OPTIONS,
        current_value=current_lang,
        callback_prefix="lang",
        locale=locale,
        back_callback="back_to_settings",
    )

    await safe_edit_message_text(
        callback, locale.get("choose_language"), keyboard
    )

@router.callback_query(lambda c: c.data and c.data.startswith("lang_"))
async def language_selected(callback: CallbackQuery):
    lang = callback.data.split("_")[1]
    await db.update(
        'UPDATE users SET lang = $1 WHERE user_id = $2',
        lang,
        callback.from_user.id,
    )
    locale = i18n.get_locale(lang)

    keyboard = build_options_keyboard(
        options=LANG_OPTIONS,
        current_value=lang,
        callback_prefix="lang",
        locale=locale,
        back_callback="back_to_settings",
    )

    await safe_edit_message_text(
        callback, locale.get("choose_language"), keyboard
    )
    await callback.answer(
        locale.get("language_set").format(lang=lang)
    )


@router.callback_query(lambda c: c.data == "setting_backend")
async def show_backend_settings(callback: CallbackQuery):
    locale = await get_user_locale(callback.from_user.id)

    data = await db.fetch(
        'SELECT chart_backend, lang FROM users WHERE user_id = $1',
        callback.from_user.id
    )
    current_backend = data.get('chart_backend', 'matplotlib')
    backend_label = locale.get(current_backend, current_backend)

    keyboard = build_options_keyboard(
        options=[("typst", "Typst"), ("matplotlib", "Matplotlib")],
        current_value=current_backend,
        callback_prefix="backend",
        locale=locale,
        back_callback="back_to_settings",
    )

    await safe_edit_message_text(
        callback,
        f"{locale.get('choose_chart_backend', 'Choose Chart Backend')}",
        keyboard
    )


@router.callback_query(lambda c: c.data and c.data.startswith("backend_"))
async def set_backend(callback: CallbackQuery):
    backend = callback.data.split("_")[1]

    await db.update(
        'UPDATE users SET chart_backend = $1 WHERE user_id = $2', 
        backend, callback.from_user.id
    )

    locale = await get_user_locale(callback.from_user.id)

    keyboard = build_options_keyboard(
        options=[("typst", "Typst"), ("matplotlib", "Matplotlib")],
        current_value=backend,
        callback_prefix="backend",
        locale=locale,
        back_callback="back_to_settings",
    )

    await safe_edit_message_text(
        callback,
        locale.get("choose_chart_backend", "Choose Chart Backend"),
        keyboard
    )


@router.callback_query(lambda c: c.data == "back_to_settings")
async def back_to_settings(callback: CallbackQuery):
    locale = await get_user_locale(callback.from_user.id)

    settings_keyboard = InlineKeyboardMarkup(
        inline_keyboard=[
            [
                InlineKeyboardButton(
                    text=locale.get("setting_chart", "Chart Settings"),
                    callback_data="setting_chart",
                ),
                InlineKeyboardButton(
                    text=locale.get("setting_lang", "Language Settings"),
                    callback_data="setting_lang",
                ),
                InlineKeyboardButton(
                    text=locale.get("setting_backend", "Chart Backend"),
                    callback_data="setting_backend",
                ),
            ],
        ]
    )

    await safe_edit_message_text(
        callback, locale.get("settings_title", "Settings"), settings_keyboard
    )


@router.callback_query(lambda c: c.data == "setting_chart")
async def show_chart_settings(callback: CallbackQuery):
    data = await db.fetch(
        'SELECT * FROM users WHERE user_id = $1',
        callback.from_user.id,
    )
    lang = data.get("lang", "en")
    locale = i18n.get_locale(lang)

    chart_status = bool(data.get("chart", 1))
    period = data.get("chart_period")

    status_text = locale.get("enabled", "Enabled") \
        if chart_status \
            else locale.get("disabled", "Disabled")
    period_text = locale.get(period, period)

    text = (
        f"{locale.get('chart_settings', 'Chart Settings')}\n"
        f"{locale.get('status', 'Status')}: {status_text}\n"
        f"{locale.get('period', 'Period')}: {period_text}\n"
        f"{locale.get('selected_chart_backend')}: {data.get('chart_backend')}"
    )
    keyboard = get_chart_toggle_keyboard(chart_status, locale)

    await safe_edit_message_text(callback, text, keyboard)


@router.callback_query(lambda c: c.data == "chart_toggle")
async def toggle_chart(callback: CallbackQuery):
    data = await db.fetch(
        'SELECT chart, lang FROM users WHERE user_id = $1', 
        callback.from_user.id
    )
    lang = data.get("lang", "en")
    locale = i18n.get_locale(lang)

    current_status = data.get("chart", True)
    new_status = not current_status

    await db.update(
        'UPDATE users SET chart = $1 WHERE user_id = $2', 
        new_status, callback.from_user.id
    )

    await show_chart_settings(callback)


@router.callback_query(lambda c: c.data == "chart_period")
async def change_chart_period(callback: CallbackQuery):
    data = await db.fetch(
        'SELECT chart_period, lang FROM users WHERE user_id = $1', 
        callback.from_user.id
    )
    lang = data.get("lang", "en")
    locale = i18n.get_locale(lang)

    current_period = data.get("chart_period")

    keyboard = build_options_keyboard(
        options=PERIOD_OPTIONS,
        current_value=current_period,
        callback_prefix="period",
        locale=locale,
        back_callback="setting_chart",
    )

    await safe_edit_message_text(
        callback,
        locale.get("choose_period", "Choose Period"),
        keyboard
    )


@router.callback_query(lambda c: c.data and c.data.startswith("period_"))
async def set_chart_period(callback: CallbackQuery):
    period = callback.data.split("_")[1]
    await db.update(
        'UPDATE users SET chart_period = $1 WHERE user_id = $2', 
        period, callback.from_user.id
    )

    locale = await get_user_locale(callback.from_user.id)

    keyboard = build_options_keyboard(
        options=PERIOD_OPTIONS,
        current_value=period,
        callback_prefix="period",
        locale=locale,
        back_callback="setting_chart",
    )

    await safe_edit_message_text(
        callback,
        locale.get("choose_period", "Choose Period"),
        keyboard
    )
    await callback.answer(locale.get("period_set", "Period set to {period}").format(period=period))