// src/tui/functions/common/login.rs

use crate::services::auth::AuthClient;
use crate::state::pages::auth::AuthState;
use crate::state::pages::auth::LoginState;
use crate::state::app::state::AppState;
use crate::state::pages::canvas_state::CanvasState;
use crate::ui::handlers::context::DialogPurpose;

/// Attempts to log the user in using the provided credentials via gRPC.
/// Updates AuthState and AppState on success or failure.
pub async fn save(
    auth_state: &mut AuthState,
    login_state: &mut LoginState,
    auth_client: &mut AuthClient,
    app_state: &mut AppState,
) -> Result<String, Box<dyn std::error::Error>> {
    let identifier = login_state.username.clone();
    let password = login_state.password.clone();

    // Clear previous error/dialog state before attempting
    login_state.error_message = None;
    // Use the helper to ensure dialog is hidden and cleared properly
    app_state.hide_dialog();

    // Call the gRPC login method
    match auth_client.login(identifier, password).await {
        Ok(response) => {
            // Store authentication details on success
            auth_state.auth_token = Some(response.access_token.clone());
            auth_state.user_id = Some(response.user_id.clone());
            auth_state.role = Some(response.role.clone());
            auth_state.decoded_username = Some(response.username.clone());
            login_state.set_has_unsaved_changes(false);

            let success_message = format!(
                "Login Successful!\n\n\
                 Username: {}\n\
                 User ID: {}\n\
                 Role: {}",
                response.username,
                response.user_id,
                response.role
            );

            app_state.show_dialog(
                "Login Success",
                &success_message,
                vec!["Menu".to_string(), "Exit".to_string()],
                DialogPurpose::LoginSuccess,
            );

            Ok("Login successful, details shown in dialog.".to_string())
        }
        Err(e) => {
            let error_message = format!("{}", e);

            // Use the helper method to configure and show the dialog
            app_state.show_dialog(
                "Login Failed",
                &error_message,
                vec!["OK".to_string()],
                DialogPurpose::LoginFailed,
            );

            login_state.set_has_unsaved_changes(true);

            Ok(format!("Login failed: {}", error_message))
        }
    }
}

/// Reverts the login form fields to empty and returns to the previous screen (Intro).
pub async fn revert(
    login_state: &mut LoginState,
    app_state: &mut AppState,
) -> String {
    // Clear the input fields
    login_state.username.clear();
    login_state.password.clear();
    login_state.error_message = None;
    login_state.set_has_unsaved_changes(false);

    "Login reverted".to_string()
}

pub async fn back_to_main(
    login_state: &mut LoginState,
    app_state: &mut AppState,
) -> String {
    // Clear the input fields
    login_state.username.clear();
    login_state.password.clear();
    login_state.error_message = None;
    login_state.set_has_unsaved_changes(false);

    // Ensure dialog is hidden if revert is called
    app_state.hide_dialog(); // Uncomment if needed

    // Navigation logic (currently disabled in original code)
    app_state.ui.show_login = false;
    app_state.ui.show_intro = true;

    // Reset focus state
    app_state.ui.focus_outside_canvas = false;
    app_state.focused_button_index= 0;

    "Returned to main menu".to_string()
}