const moment = require('moment');
const colors = require('colors/safe');
const util = require('util');

function padCenter(x, p, n) {
    x = '' + x;
    let z = false;
    while (x.length < n) {
        if (z) {
            z = false;
            x = p + x;
        } else {
            z = true;
            x = x + p;
        }
    }
    return x;
}

function createLogger(name, processConsole) {
    processConsole = processConsole || console;
    let logger = {};
    function colorize(level, text) {
        let map = {
            'error': colors.red,
            'warn':  colors.yellow,
            'info':  colors.green,
            'debug': colors.blue,
            'silly': colors.magenta,
        };
        if (level in map) {
            return map[level](text);
        } else {
            return colors.bgWhite(text);
        }
    }
    logger.log = function(level, message, data) {
        let prefix = `[ ${colorize(level, padCenter(level, ' ', 5))} | ${padCenter(name, ' ', 6)} | ${moment().format('HH:mm:ss.SSS')} ]`;
        let out = '';
        if (message !== undefined && typeof message !== 'string') {
            data = message;
            message = null;
        }
        if (message) {
            out += message.split('\n').map(o => `${prefix}: ${o}`).join('\n');
            // out += `${prefix}: ${message}`;
        }
        function handleData(data) {
            if (data) {
                if (typeof message === 'string') {
                    out += '\n';
                }
                if (data instanceof Error) {
                    if (data.stack) {
                        out += `${prefix}# ${data.stack.split('\n').join(`\n${prefix}# `)}`;
                    } else {
                        out += `${prefix}# ${data.name}: ${data.message}`;
                    }
                } else {
                    let s = util.inspect(data, { colors: true });
                    s = s.split('\n').map(o => `${prefix}$ ${o}`).join('\n');
                    out += s;
                    //let s = `{${prettyjson.render(data).split('\n').map(o => '  ' + o).join('\n').substring(1)} }`;
                    //out += `${prefix}$ ${s.split('\n').map(o => colors.italic(o)).join(`\n${prefix}$ `)}`;
                }
            }
        }
        if (Array.isArray(data)) {
            data.forEach(handleData);
        } else {
            handleData(data);
        }
        processConsole.log(out);
    }
    logger.error = (message, data) => { logger.log('error', message, data); };
    logger.warn  = (message, data) => { logger.log('warn',  message, data); };
    logger.info  = (message, data) => { logger.log('info',  message, data); };
    logger.debug = (message, data) => { logger.log('debug', message, data); };
    logger.silly = (message, data) => { logger.log('silly', message, data); };
    return logger;
}

module.exports = createLogger;