import streamlit as st

from config import AppConfig
from pages import log_page_visit


class AuthManager:
    def __init__(self, config: AppConfig):
        self.config = config

    def check_admin_access(self) -> bool:
        """Check if admin access is granted"""
        if not self.config.ADMIN_PASSWORD:
            return False
        return st.session_state.get("admin_authenticated", False)

    def is_logged_in(self) -> bool:
        """Check if user is logged in"""
        return st.session_state.get("logged_in", False) and st.session_state.get(
            "admin_authenticated", False
        )

    def authenticate(self, username: str, password: str) -> bool:
        """Authenticate user credentials"""
        return (
            username == "admin"
            and password == self.config.ADMIN_PASSWORD
            and bool(self.config.ADMIN_PASSWORD)
        )


@log_page_visit(page_name="Login")
def login(auth_manager: AuthManager):
    """Handle admin login with proper configuration and state management"""
    st.title("Login")

    # Redirect if already authenticated
    if auth_manager.check_admin_access():
        st.success("Already logged in!")
        return

    with st.form("login_form"):
        username = st.text_input("Username")
        password = st.text_input("Password", type="password")
        submit = st.form_submit_button("Log in")

        if submit:
            if auth_manager.authenticate(username, password):
                st.session_state.update(
                    {"logged_in": True, "admin_authenticated": True}
                )
                st.success("Login successful!")
                st.rerun()
            else:
                if not auth_manager.config.ADMIN_PASSWORD:
                    st.error("Admin access is not configured")
                else:
                    st.error("Invalid username or password")


def logout():
    """Handle admin logout"""
    if st.button("Log out"):
        st.session_state.update({"logged_in": False, "admin_authenticated": False})
        st.rerun()


# Create page objects with auth manager dependency
def create_admin_pages(config: AppConfig):
    auth_manager = AuthManager(config)
    return {
        "login": st.Page(
            lambda: login(auth_manager),
            title="Log in",
            url_path="/login",
            icon=":material/login:",
        ),
        "logout": st.Page(logout, title="Log out", icon=":material/logout:"),
    }