import os

from flask import Blueprint, jsonify, request, current_app, redirect
from werkzeug.utils import secure_filename

from app.extensions import db
from app.models.session import Session
from paper.errors import NeedPasswordException
from paper.parser import PaperParser

sessions = Blueprint("sessions", __name__, url_prefix="/sessions")

ALLOWED_EXTENSIONS = ['zip']

def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS

async def create_session_form():
    data = request.json
    data["name"] = data["name"].replace("/", "").replace("\\", "") 

    session = Session.query.filter_by(name=data.get("name")).first()

    if not session:
        session = Session(
            name=data.get("name"),
            authorized=False
        )
        
        db.session.add(session)
    
    response = {"status": "ok"}

    async with PaperParser(data.get("name")) as parser:
        try:
            result = await parser.sign_in(**data)

            if hasattr(result, "phone_code_hash"):
                response = {
                    "status": "error",
                    "message": "Need secret code from telegram",
                    "action": "code",
                    "phone_hash": result.phone_code_hash,
                }
            else:
                session.authorized = True

        except NeedPasswordException:
            response = {
                "status": "error",
                "message": "Need 2FA Password",
                "action": "password",
            }
        
        except Exception as e:
            response = {
                "status": "exception",
                "message": str(e),
            }
        
        finally:
            db.session.commit()
    
    return jsonify(response)

def create_session_from_file():
    archive = request.files['archive']
    
    if archive.filename == '':
        return 'Not Found', 404
    
    if not allowed_file(archive.filename):
        return 'File Extension Not Allowed', 406
    
    session_upload_path = os.path.join(current_app.config['UPLOAD_DIR'], "sessions")
    
    if not os.path.exists(session_upload_path):
        os.makedirs(session_upload_path)
    
    filename = secure_filename(archive.filename)
    file_path = os.path.join(session_upload_path, filename)
    
    archive.save(file_path)
    
    return 'Ok', 200
    # return redirect('/')

@sessions.route("/", methods=["POST"])
async def create_session():
    files = request.files
    if not 'archive' in files:
        return await create_session_form()
    else:
        return create_session_from_file()

@sessions.route("/", methods=["GET"])
def get_sessions(**kwargs):
    return Session.query.filter_by(authorized=True).all()

@sessions.route("/<int:id>", methods=["DELETE"])
async def remove_session(id: int):
    session: Session = Session.query.get_or_404(id)
    
    if session.has_depending_tasks():
        return 'Есть зависимые задачи', 409
    
    async with PaperParser(session.name) as parser:
        try:
            await parser.client.log_out()
        
            db.session.delete(session)
            db.session.commit()
                
        except Exception as e:
            return str(e), 500
        
    return 'ok', 200