//! # Admin account controller
//!
//! @author Pierre Hubert



use crate::api_data::admin::admin_auth_options::AdminAuthOptions;
use crate::api_data::admin::admin_auth_success::AdminAuthSuccess;
use crate::api_data::admin::admin_id_api::AdminIDAPI;
use crate::api_data::admin::admin_info_api::AdminInfoAPI;
use crate::api_data::admin::admin_keys_api::AdminKeyAPI;
use crate::data::admin::{AdminKey, NewAdminGeneralSettings};
use crate::data::base_request_handler::BaseRequestHandler;
use crate::data::error::Res;
use crate::data::http_request_handler::HttpRequestHandler;
use crate::data::webauthn_config::get_wan;
use crate::helpers::{admin_access_token_helper, admin_account_helper, admin_account_key_helper, admin_key_authentication_challenges_helper, admin_key_registration_challenges_helper};
use crate::routes::RequestResult;
use crate::utils::date_utils::time;

impl HttpRequestHandler {
    pub fn post_admin_auth_key(&mut self, name_mail: &str, name_key_id: &str) -> Res<AdminKey> {
        let mail = self.post_string(name_mail)?;
        let key_id = self.post_u64(name_key_id)?;

        let admin = admin_account_helper::find_admin_by_email(&mail)?;
        let keys = admin_account_key_helper::get_admin_keys(admin.id)?;

        let key = keys.into_iter()
            .filter(|k| k.id == key_id)
            .next();

        match key {
            Some(key) => Ok(key),
            None => Err(self.bad_request("The key is not associated with this account!".to_string()).unwrap_err())
        }
    }
}

/// Get admin auth options
pub fn get_auth_options(r: &mut HttpRequestHandler) -> RequestResult {
    let mail = r.post_email("mail")?;
    let admin = admin_account_helper::find_admin_by_email(&mail)?;
    let keys = admin_account_key_helper::get_admin_keys(admin.id)?;

    r.set_response(AdminAuthOptions::new(&admin, &keys))
}

/// Login admin using a reset token
pub fn auth_with_reset_token(r: &mut HttpRequestHandler) -> RequestResult {
    let reset_token = r.post_string("token")?;
    let admin = admin_account_helper::find_admin_by_email(&r.post_email("mail")?)?;

    let token = r.some_or_internal_error(
        admin.reset_token,
        "Specified user has not valid reset token for now!",
    )?;

    if !token.token.eq(&reset_token) || time() > token.expire {
        return r.forbidden("Specified reset token is invalid!".to_string());
    }

    let token = admin_access_token_helper::create(admin.id)?;

    r.set_response(AdminAuthSuccess::new(token))
}

/// Sign out current admin
pub fn sign_out(r: &mut HttpRequestHandler) -> RequestResult {
    admin_access_token_helper::destroy(r.admin_id()?)?;

    r.ok()
}

/// Get current admin ID
pub fn get_admin_id(r: &mut HttpRequestHandler) -> RequestResult {
    r.set_response(AdminIDAPI::new(r.admin_id()?))
}

/// Get current admin information
pub fn get_admin_info(r: &mut HttpRequestHandler) -> RequestResult {
    let admin = match r.has_post_parameter("id") {
        false => admin_account_helper::find_admin_by_id(r.admin_id()?)?,
        true => {
            let admin_id = r.post_admin_id("id")?;
            admin_account_helper::find_admin_by_id(admin_id)?
        }
    };

    r.set_response(AdminInfoAPI::new(&admin))
}

/// Get an admin keys
pub fn get_keys_list(r: &mut HttpRequestHandler) -> RequestResult {
    let admin_id = r.post_admin_id("id")?;

    if admin_id != r.admin_id()? {
        // TODO : implement
        unimplemented!();
    }

    let keys = admin_account_key_helper::get_admin_keys(admin_id)?;

    r.set_response(keys.iter().map(AdminKeyAPI::new).collect::<Vec<AdminKeyAPI>>())
}

/// Update general settings
pub fn update_general_settings(r: &mut HttpRequestHandler) -> RequestResult {
    let admin_id = r.post_admin_id("id")?;
    let new_name = r.post_string("name")?;
    let new_email = r.post_email("email")?;

    if admin_id != r.admin_id()? {
        // TODO
        unimplemented!();
    }

    admin_account_helper::set_general_settings(NewAdminGeneralSettings {
        id: admin_id,
        name: new_name,
        email: new_email,
    })?;

    r.ok()
}

/// Generate a challenge to register a new key
pub fn challenge_register_key(r: &mut HttpRequestHandler) -> RequestResult {
    let mut wan = get_wan();

    let (res, state) = wan.generate_challenge_register(&r.admin_id()?.id_str(), None)?;

    admin_key_registration_challenges_helper::set(r.admin_id()?, state)?;

    r.set_response(res)
}

/// Register key
pub fn register_key(r: &mut HttpRequestHandler) -> RequestResult {
    let name = r.post_string("name")?;

    let creds = r.post_register_public_key_credential("key")?;
    let state = r.some_or_internal_error(
        admin_key_registration_challenges_helper::get(r.admin_id()?)?,
        "No challenge found!",
    )?;

    let wan = get_wan();
    let key = wan.register_credential(creds, state, |_| Ok(false))?;

    admin_account_key_helper::add_key(r.admin_id()?, &name, key)?;

    r.ok()
}

/// Delete an admin auth key
pub fn delete_auth_key(r: &mut HttpRequestHandler) -> RequestResult {
    let admin_id = r.post_admin_id("adminID")?;
    let key_id = r.post_u64("keyID")?;

    if admin_id != r.admin_id()? {
        unimplemented!(); // TODO
    }

    for key in admin_account_key_helper::get_admin_keys(admin_id)? {
        if key.id == key_id {
            admin_account_key_helper::delete_key(key)?;

            return r.ok();
        }
    }

    r.not_found("Requested key was not found!".to_string())
}

/// Generate a challenge to authenticate with a security key
pub fn challenge_auth_with_key(r: &mut HttpRequestHandler) -> RequestResult {
    let key = r.post_admin_auth_key("mail", "key_id")?;

    let (challenge_response, auth_state) =
        get_wan().generate_challenge_authenticate(vec![key.key], None)?;

    admin_key_authentication_challenges_helper::set(key.id, auth_state)?;

    r.set_response(challenge_response)
}

/// Authenticate a user with a security key
pub fn auth_with_key(r: &mut HttpRequestHandler) -> RequestResult {
    let key = r.post_admin_auth_key("mail", "key_id")?;
    let credentials = r.post_auth_public_key_credential("credential")?;

    let state = r.some_or_internal_error(
        admin_key_authentication_challenges_helper::get(key.id)?,
        "Associated authentication state not found!",
    )?;

    // Perform authentication
    let state = get_wan().authenticate_credential(credentials, state)?;
    r.some_or_bad_request(state, "Invalid key!")?;

    // Generate access token
    let token = admin_access_token_helper::create(key.admin_id)?;

    r.set_response(AdminAuthSuccess::new(token))
}