import re
import streamlit as st
from app_core.services.auth_service import AuthService


def _is_valid_email(value: str) -> bool:
    if not value:
        return False
    pattern = r"^[A-Za-z0-9._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,}$"
    return re.match(pattern, value.strip()) is not None


def render_auth_card(auth_service: AuthService) -> None:
    left, center, right = st.columns([1, 1.2, 1])
    with center:
       
        st.markdown('<div class="auth-title">Welcome !!</div>', unsafe_allow_html=True)
        st.markdown('<div class="muted" style="margin-bottom:16px;">Sign in to continue</div>', unsafe_allow_html=True)

        with st.form("login_form", clear_on_submit=False):
            email = st.text_input("Email", placeholder="you@example.com", key="login_email")
            password = st.text_input("Password", type="password", placeholder="••••••••", key="login_password")
            submitted = st.form_submit_button("Sign in →", use_container_width=True)
        if submitted:
            if not _is_valid_email(email):
                st.error("Enter a valid email address.")
            elif not password:
                st.error("Password is required.")
            else:
                ok, user, msg = auth_service.login(email, password)
                if ok and user:
                    st.session_state.auth_user = user
                    st.success(msg)
                    st.rerun()
                else:
                    st.error(msg)
        st.markdown('</div>', unsafe_allow_html=True)