'use strict';

let packageInfo = require('../../../package');
let imapHandler = require('../handler/imap-handler');

let allowedKeys = ['name', 'version', 'os', 'os-version', 'vendor', 'support-url', 'address', 'date', 'command', 'arguments', 'environment'];

module.exports = {
    schema: [{
        name: 'id',
        type: ['null', 'array']
    }],
    handler(command, callback) {
        let clientId = {};
        let serverId = {};
        let serverIdList = [];
        let key = false;
        let maxKeyLen = 0;

        if (this._server.options.id && typeof this._server.options.id === 'object') {
            Object.keys(this._server.options.id).forEach(key => {
                serverId[key] = this._server.options.id[key];
            });
        } else {
            serverId.name = packageInfo.name;
            serverId.version = packageInfo.version;
            serverId.vendor = 'Kreata';
        }

        // Log ID information proviced by the client
        if (Array.isArray(command.attributes[0])) {
            command.attributes[0].forEach(val => {
                if (key === false) {
                    key = (val.value || '').toString().toLowerCase().trim();
                } else {
                    if (allowedKeys.indexOf(key) >= 0) {
                        clientId[key] = (val.value || '').toString();
                        maxKeyLen = Math.max(maxKeyLen, key.length);
                    }
                    key = false;
                }
            });

            this._server.logger.info('[%s] Client identification data received', this.id);

            Object.keys(clientId).
            sort((a, b) => (allowedKeys.indexOf(a) - allowedKeys.indexOf(b))).
            forEach(key => {
                this._server.logger.info('[%s] %s%s: %s', this.id, key, new Array(maxKeyLen - key.length + 1).join(' '), clientId[key]);
            });
        }

        // Create response ID serverIdList
        if (Object.keys(serverId).length) {
            Object.keys(serverId).forEach(key => {
                serverIdList.push({
                    type: 'string',
                    value: (key || '').toString()
                });
                serverIdList.push({
                    type: 'string',
                    value: (serverId[key] || '').toString()
                });
            });
        }

        this.send(imapHandler.compiler({
            tag: '*',
            command: 'ID',
            attributes: serverIdList.length ? [serverIdList] : {
                type: 'atom',
                value: 'NIL'
            }
        }));

        callback(null, {
            response: 'OK'
        });
    }
};