# Standard libraries
#import base64
#import io
import json
#import os
#import re
#import tempfile
#import time
#from os import getenv
from typing import Any
from typing import Dict
#from typing import IO
#from typing import List
from typing import Optional
#from typing import Tuple
#from typing import Union

# Third-party libraries
import streamlit as st


from var_app import __version__

LANGUAGES_EMOJI = {
    "Afrikaans": "🇿🇦", "Arabic": "🇸🇦", "Armenian": "🇦🇲", "Azerbaijani": "🇦🇿", "Belarusian": "🇧🇾", 
    "Bosnian": "🇧🇦", "Bulgarian": "🇧🇬", "Catalan": "🇪🇸", "Chinese": "🇨🇳", "Croatian": "🇭🇷", 
    "Czech": "🇨🇿", "Danish": "🇩🇰", "Dutch": "🇳🇱", "English": "🇬🇧", "Estonian": "🇪🇪", 
    "Finnish": "🇫🇮", "French": "🇫🇷", "Galician": "🇪🇸", "German": "🇩🇪", "Greek": "🇬🇷", 
    "Hebrew": "🇮🇱", "Hindi": "🇮🇳", "Hungarian": "🇭🇺", "Icelandic": "🇮🇸", "Indonesian": "🇮🇩", 
    "Italian": "🇮🇹", "Japanese": "🇯🇵", "Kannada": "🇮🇳", "Kazakh": "🇰🇿", "Korean": "🇰🇷", 
    "Latvian": "🇱🇻", "Lithuanian": "🇱🇹", "Macedonian": "🇲🇰", "Malay": "🇲🇾", "Marathi": "🇮🇳", 
    "Maori": "🇳🇿", "Nepali": "🇳🇵", "Norwegian": "🇳🇴", "Persian": "🇮🇷", "Polish": "🇵🇱", 
    "Portuguese": "🇵🇹", "Romanian": "🇷🇴", "Russian": "🇷🇺", "Serbian": "🇷🇸", "Slovak": "🇸🇰", 
    "Slovenian": "🇸🇮", "Spanish": "🇪🇸", "Swahili": "🇰🇪", "Swedish": "🇸🇪", "Tagalog": "🇵🇭", 
    "Tamil": "🇮🇳", "Thai": "🇹🇭", "Turkish": "🇹🇷", "Ukrainian": "🇺🇦", "Urdu": "🇵🇰", 
    "Vietnamese": "🇻🇳", "Welsh": "🏴󠁧󠁢󠁷󠁬󠁳󠁿"
}

def load_ui_language(file_path: Optional[str] = "ui_lang_support.json") -> Dict[str, Any]:
    """
    Charge les traductions de l'interface utilisateur à partir d'un fichier JSON.

    Args:
        file_path (Optional[str]): Chemin vers le fichier JSON contenant les traductions.

    Returns:
        Dict[str, Any]: Un dictionnaire contenant les traductions de l'interface utilisateur.
    """
    try:
        with open(file_path, 'r', encoding='utf-8') as file:
            return json.load(file)
    except FileNotFoundError:
        print(f"{get_translation('erreur_fichier_non_trouve')} {file_path}")
        return {}
    except json.JSONDecodeError:
        print(f"{get_translation('erreur_lecture_fichier')} JSON decoding error")
        return {}
    except IOError as e:
        print(f"{get_translation('erreur_lecture_fichier')} {e}")
        return {}

def get_translation(key: str) -> str:
    """
    Obtient la traduction pour une clé donnée basée sur la langue d'interface sélectionnée.
    """
    lang = st.session_state.get('interface_language', 'English')
    return translations.get(lang, {}).get(key, key)

# Dictionary to store translations
translations = load_ui_language()

def language_selection_page():
    st.set_page_config(initial_sidebar_state="collapsed")
    #st.set_page_config(page_icon="👹")
    #st.set_page_config(layout="wide")
    # Fonction de rappel pour mettre à jour la langue temporaire lorsque la sélection change
    def update_temp_language():
        st.session_state['temp_interface_language'] = st.session_state['language_selector']
        
    # Initialiser la langue temporaire si elle n'existe pas
    if 'temp_interface_language' not in st.session_state:
        st.session_state['temp_interface_language'] = st.session_state.get('interface_language', 'English')
    
    
    # Sélecteur de langue avec un callback pour mettre à jour la langue temporaire 
    with st.container(
            border=True, 
            key='lang_choices_container', 
            height=None
        ):

        TITRE_LANGSELMENU=translations[st.session_state['temp_interface_language']].get('selection_de_la_langue', 'Language Selection')
        # Titre basé sur la langue temporaire
        st.header(
            f":blue[{TITRE_LANGSELMENU}]"
            ,divider=True)
        
        selecteur_du_choix, boutton_de_validation = st.columns(2, 
                                vertical_alignment='top',
                                gap="small")

        selected_language = selecteur_du_choix.selectbox(
            translations[st.session_state['temp_interface_language']].get('choix_selection_langue', 'Choose the interface language'),
            options=list(translations.keys()),
            index=list(translations.keys()).index(st.session_state['temp_interface_language']),
            format_func=lambda lang: f"{LANGUAGES_EMOJI.get(lang, '')} {lang}",
            key='language_selector',
            on_change=update_temp_language,
            label_visibility="collapsed"
        )

        # Bouton de confirmation avec traduction
        if boutton_de_validation.button(
            translations[st.session_state['temp_interface_language']].get(
                'confirmer', 'Confirm'), 
            key='confirm_button_ui_lang_choice',
            type="secondary",
            use_container_width=True,
            disabled = False
            ):
                st.session_state.interface_language = selected_language
                st.session_state.init_launch_app = False
                st.switch_page(st.Page("pages/main.py", title="Main page"))
 
language_selection_page()