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/*!
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

/* eslint-disable no-console */

import Common from './Common';

/**
 * Logger, to allow calls to console.log during development, but
 * disable them for production.
 */
export default class Logger {
    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * No-op call so that we can leave imports in place,
     * even when there's no debugging.
     */
    static noop() {
        // Nothing.
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Set debug level.
     * @param level threshold.
     */
    static setLevel(level) {
        this.level = Logger.OFF;
        if (Common.getType(level) === 'Number') {
            this.level = level;
        } else {
            this.level = Logger[level];
        }
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Get debug level.
     * @returns {number|*}
     */
    static getLevel() {
        return this.level;
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Write DEBUG-level log.
     * @param msg message or tokens.
     */
    static debug(...msg) {
        if (this.level >= Logger.DEBUG) {
            const out = this.serialize(msg);
            console.info(`ASDCS [DEBUG] ${out}`);
        }
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Write INFO-level log.
     * @param msg message or tokens.
     */
    static info(...msg) {
        if (this.level >= Logger.INFO) {
            const out = this.serialize(msg);
            console.info(`ASDCS [INFO] ${out}`);
        }
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Write debug.
     * @param msg message or tokens.
     */
    static warn(msg) {
        if (this.level >= Logger.WARN) {
            const out = this.serialize(msg);
            console.warn(`ASDCS [WARN] ${out}`);
        }
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Write error.
     * @param msg message or tokens.
     */
    static error(...msg) {
        if (this.level >= Logger.ERROR) {
            const out = this.serialize(msg);
            console.error(`ASDCS [ERROR] ${out}`);
        }
    }

    // ///////////////////////////////////////////////////////////////////////////////////////////////

    /**
     * Serialize msg.
     * @param msg message or tokens.
     * @returns {string}
     */
    static serialize(...msg) {
        let out = '';
        msg.forEach(token => {
            out = `${out}${token}`;
        });
        return out;
    }
}

// /////////////////////////////////////////////////////////////////////////////////////////////////

Logger.OFF = 0;
Logger.ERROR = 1;
Logger.WARN = 2;
Logger.INFO = 3;
Logger.DEBUG = 4;
Logger.level = Logger.OFF;