use failure::*;

use serde_json::{json, Value};

use proxmox::api::{api, RpcEnvironment, Permission, UserInformation};
use proxmox::api::router::{Router, SubdirMap};
use proxmox::{sortable, identity};
use proxmox::{http_err, list_subdirs_api_method};

use crate::tools;
use crate::tools::ticket::*;
use crate::auth_helpers::*;
use crate::api2::types::*;

use crate::config::cached_user_info::CachedUserInfo;
use crate::config::acl::PRIV_PERMISSIONS_MODIFY;

pub mod user;
pub mod domain;
pub mod acl;
pub mod role;

fn authenticate_user(username: &str, password: &str) -> Result<(), Error> {

    let user_info = CachedUserInfo::new()?;

    if !user_info.is_active_user(&username) {
        bail!("user account disabled or expired.");
    }

    let ticket_lifetime = tools::ticket::TICKET_LIFETIME;

    if password.starts_with("PBS:") {
        if let Ok((_age, Some(ticket_username))) = tools::ticket::verify_rsa_ticket(public_auth_key(), "PBS", password, None, -300, ticket_lifetime) {
            if ticket_username == username {
                return Ok(());
            } else {
                bail!("ticket login failed - wrong username");
            }
        }
    }

    crate::auth::authenticate_user(username, password)
}

#[api(
    input: {
        properties: {
            username: {
                schema: PROXMOX_USER_ID_SCHEMA,
            },
            password: {
                schema: PASSWORD_SCHEMA,
            },
        },
    },
    returns: {
        properties: {
            username: {
                type: String,
                description: "User name.",
            },
            ticket: {
                type: String,
                description: "Auth ticket.",
            },
            CSRFPreventionToken: {
                type: String,
                description: "Cross Site Request Forgery Prevention Token.",
            },
        },
    },
    protected: true,
    access: {
        permission: &Permission::World,
    },
)]
/// Create or verify authentication ticket.
///
/// Returns: An authentication ticket with additional infos.
fn create_ticket(username: String, password: String) -> Result<Value, Error> {
    match authenticate_user(&username, &password) {
        Ok(_) => {

            let ticket = assemble_rsa_ticket( private_auth_key(), "PBS", Some(&username), None)?;

            let token = assemble_csrf_prevention_token(csrf_secret(), &username);

            log::info!("successful auth for user '{}'", username);

            Ok(json!({
                "username": username,
                "ticket": ticket,
                "CSRFPreventionToken": token,
            }))
        }
        Err(err) => {
            let client_ip = "unknown"; // $rpcenv->get_client_ip() || '';
            log::error!("authentication failure; rhost={} user={} msg={}", client_ip, username, err.to_string());
            Err(http_err!(UNAUTHORIZED, "permission check failed.".into()))
        }
    }
}

#[api(
    input: {
        properties: {
            userid: {
                schema: PROXMOX_USER_ID_SCHEMA,
            },
            password: {
                schema: PASSWORD_SCHEMA,
            },
        },
    },
    access: {
        description: "Anybody is allowed to change there own password. In addition, users with 'Permissions:Modify' privilege may change any password.",
        permission: &Permission::Anybody,
    },

)]
/// Change user password
///
/// Each user is allowed to change his own password. Superuser
/// can change all passwords.
fn change_password(
    userid: String,
    password: String,
    rpcenv: &mut dyn RpcEnvironment,
) -> Result<Value, Error> {

    let current_user = rpcenv.get_user()
        .ok_or_else(|| format_err!("unknown user"))?;

    let mut allowed = userid == current_user;

    if userid == "root@pam" { allowed = true; }

    if !allowed {
        use crate::config::cached_user_info::CachedUserInfo;

        let user_info = CachedUserInfo::new()?;
        let privs = user_info.lookup_privs(&current_user, &[]);
        if (privs & PRIV_PERMISSIONS_MODIFY) != 0 { allowed = true; }
    }

    if !allowed {
        bail!("you are not authorized to change the password.");
    }

    let (username, realm) = crate::auth::parse_userid(&userid)?;
    let authenticator = crate::auth::lookup_authenticator(&realm)?;
    authenticator.store_password(&username, &password)?;

    Ok(Value::Null)
}

#[sortable]
const SUBDIRS: SubdirMap = &sorted!([
    ("acl", &acl::ROUTER),
    (
        "password", &Router::new()
            .put(&API_METHOD_CHANGE_PASSWORD)
    ),
    (
        "ticket", &Router::new()
            .post(&API_METHOD_CREATE_TICKET)
    ),
    ("domains", &domain::ROUTER),
    ("roles", &role::ROUTER),
    ("users", &user::ROUTER),
]);

pub const ROUTER: Router = Router::new()
    .get(&list_subdirs_api_method!(SUBDIRS))
    .subdirs(SUBDIRS);