/* jslint node: true */
'use strict';

//  ENiGMA½
const { removeClient }  = require('./client_connections.js');
const ansiNormal        = require('./ansi_term.js').normal;
const { userLogin }     = require('./user_login.js');
const messageArea       = require('./message_area.js');
const { ErrorReasons }  = require('./enig_error.js');
const UserProps         = require('./user_property.js');
const {
    loginFactor2_OTP
}                       = require('./user_2fa_otp.js');

//  deps
const _                 = require('lodash');
const iconv             = require('iconv-lite');

exports.login                   = login;
exports.login2FA_OTP            = login2FA_OTP;
exports.logoff                  = logoff;
exports.prevMenu                = prevMenu;
exports.nextMenu                = nextMenu;
exports.prevConf                = prevConf;
exports.nextConf                = nextConf;
exports.prevArea                = prevArea;
exports.nextArea                = nextArea;
exports.sendForgotPasswordEmail = sendForgotPasswordEmail;
exports.optimizeDatabases       = optimizeDatabases;

const handleAuthFailures = (callingMenu, err, cb) => {
    //  already logged in with this user?
    if(ErrorReasons.AlreadyLoggedIn === err.reasonCode &&
        _.has(callingMenu, 'menuConfig.config.tooNodeMenu'))
    {
        return callingMenu.gotoMenu(callingMenu.menuConfig.config.tooNodeMenu, cb);
    }

    //  banned username results in disconnect
    if(ErrorReasons.NotAllowed === err.reasonCode) {
        return logoff(callingMenu, {}, {}, cb);
    }

    const ReasonsMenus = [
        ErrorReasons.TooMany, ErrorReasons.Disabled, ErrorReasons.Inactive, ErrorReasons.Locked
    ];
    if(ReasonsMenus.includes(err.reasonCode)) {
        const menu = _.get(callingMenu, [ 'menuConfig', 'config', err.reasonCode.toLowerCase() ]);
        return menu ? callingMenu.gotoMenu(menu, cb) : logoff(callingMenu, {}, {}, cb);
    }

    //  Other error
    return callingMenu.prevMenu(cb);
};

function login(callingMenu, formData, extraArgs, cb) {

    userLogin(callingMenu.client, formData.value.username, formData.value.password, err => {
        if(err) {
            return handleAuthFailures(callingMenu, err, cb);
        }

        //  success!
        return callingMenu.nextMenu(cb);
    });
}

function login2FA_OTP(callingMenu, formData, extraArgs, cb) {
    loginFactor2_OTP(callingMenu.client, formData.value.token, err => {
        if(err) {
            return handleAuthFailures(callingMenu, err, cb);
        }

        //  success!
        return callingMenu.nextMenu(cb);
    });
}

function logoff(callingMenu, formData, extraArgs, cb) {
    //
    //  Simple logoff. Note that recording of @ logoff properties/stats
    //  occurs elsewhere!
    //
    const client = callingMenu.client;

    setTimeout( () => {
        //
        //  For giggles...
        //
        client.term.write(
            ansiNormal() +  '\n' +
            iconv.decode(require('crypto').randomBytes(Math.floor(Math.random() * 65) + 20), client.term.outputEncoding) +
            'NO CARRIER', null, () => {

                //  after data is written, disconnect & remove the client
                removeClient(client);
                return cb(null);
            }
        );
    }, 500);
}

function prevMenu(callingMenu, formData, extraArgs, cb) {

    //  :TODO: this is a pretty big hack -- need the whole key map concep there like other places
    if(formData.key && 'return' === formData.key.name) {
        callingMenu.submitFormData = formData;
    }

    callingMenu.prevMenu( err => {
        if(err) {
            callingMenu.client.log.error( { error : err.message }, 'Error attempting to fallback!');
        }
        return cb(err);
    });
}

function nextMenu(callingMenu, formData, extraArgs, cb) {
    callingMenu.nextMenu( err => {
        if(err) {
            callingMenu.client.log.error( { error : err.message}, 'Error attempting to go to next menu!');
        }
        return cb(err);
    });
}

//  :TODO: need redrawMenu() and MenuModule.redraw()
function reloadMenu(menu, cb) {
    return menu.reload(cb);
}

function prevConf(callingMenu, formData, extraArgs, cb) {
    const confs     = messageArea.getSortedAvailMessageConferences(callingMenu.client);
    const currIndex = confs.findIndex( e => e.confTag === callingMenu.client.user.properties[UserProps.MessageConfTag]) || confs.length;

    messageArea.changeMessageConference(callingMenu.client, confs[currIndex - 1].confTag, err => {
        if(err) {
            return cb(err); //  logged within changeMessageConference()
        }

        return reloadMenu(callingMenu, cb);
    });
}

function nextConf(callingMenu, formData, extraArgs, cb) {
    const confs     = messageArea.getSortedAvailMessageConferences(callingMenu.client);
    let currIndex   = confs.findIndex( e => e.confTag === callingMenu.client.user.properties[UserProps.MessageConfTag]);

    if(currIndex === confs.length - 1) {
        currIndex = -1;
    }

    messageArea.changeMessageConference(callingMenu.client, confs[currIndex + 1].confTag, err => {
        if(err) {
            return cb(err); //  logged within changeMessageConference()
        }

        return reloadMenu(callingMenu, cb);
    });
}

function prevArea(callingMenu, formData, extraArgs, cb) {
    const areas     = messageArea.getSortedAvailMessageAreasByConfTag(callingMenu.client.user.properties[UserProps.MessageConfTag]);
    const currIndex = areas.findIndex( e => e.areaTag === callingMenu.client.user.properties[UserProps.MessageAreaTag]) || areas.length;

    messageArea.changeMessageArea(callingMenu.client, areas[currIndex - 1].areaTag, err => {
        if(err) {
            return cb(err); //  logged within changeMessageArea()
        }

        return reloadMenu(callingMenu, cb);
    });
}

function nextArea(callingMenu, formData, extraArgs, cb) {
    const areas     = messageArea.getSortedAvailMessageAreasByConfTag(callingMenu.client.user.properties[UserProps.MessageConfTag]);
    let currIndex   = areas.findIndex( e => e.areaTag === callingMenu.client.user.properties[UserProps.MessageAreaTag]);

    if(currIndex === areas.length - 1) {
        currIndex = -1;
    }

    messageArea.changeMessageArea(callingMenu.client, areas[currIndex + 1].areaTag, err => {
        if(err) {
            return cb(err); //  logged within changeMessageArea()
        }

        return reloadMenu(callingMenu, cb);
    });
}

function sendForgotPasswordEmail(callingMenu, formData, extraArgs, cb) {
    const username = formData.value.username || callingMenu.client.user.username;

    const WebPasswordReset = require('./web_password_reset.js').WebPasswordReset;

    WebPasswordReset.sendForgotPasswordEmail(username, err => {
        if(err) {
            callingMenu.client.log.warn( { err : err.message }, 'Failed sending forgot password email');
        }

        if(extraArgs.next) {
            return callingMenu.gotoMenu(extraArgs.next, cb);
        }

        return logoff(callingMenu, formData, extraArgs, cb);
    });
}

function optimizeDatabases(callingMenu, formData, extraArgs, cb) {
    const dbs = require('./database').dbs;
    const client = callingMenu.client;

    client.term.write('\r\n\r\n');

    Object.keys(dbs).forEach(dbName => {
        client.log.info({ dbName }, 'Optimizing database');

        client.term.write(`Optimizing ${dbName}. Please wait...\r\n`);

        //  https://www.sqlite.org/pragma.html#pragma_optimize
        dbs[dbName].run('PRAGMA optimize;', err => {
            if (err) {
                client.log.error({ error : err, dbName }, 'Error attempting to optimize database');
            }
        });
    });

    return callingMenu.prevMenu(cb);
}