"use strict";

const fs = require('fs');
const dataDir = require('./data_dir');

if (!fs.existsSync(dataDir.LOG_DIR)) {
    fs.mkdirSync(dataDir.LOG_DIR, 0o700);
}

let logFile = null;

const SECOND = 1000;
const MINUTE = 60 * SECOND;
const HOUR = 60 * MINUTE;
const DAY = 24 * HOUR;

const NEW_LINE = process.platform === "win32" ? '\r\n' : '\n';

let todaysMidnight = null;

initLogFile();

function getTodaysMidnight() {
    const now = new Date();

    return new Date(now.getFullYear(), now.getMonth(), now.getDate());
}

function initLogFile() {
    todaysMidnight = getTodaysMidnight();

    const path = dataDir.LOG_DIR + '/trilium-' + formatDate() + '.log';

    if (logFile) {
        logFile.end();
    }

    logFile = fs.createWriteStream(path, {flags: 'a'});
}

function checkDate(millisSinceMidnight) {
    if (millisSinceMidnight >= DAY) {
        initLogFile();
    }
}

function log(str) {
    const millisSinceMidnight = Date.now() - todaysMidnight.getTime();

    checkDate(millisSinceMidnight);

    logFile.write(formatTime(millisSinceMidnight) + ' ' + str + NEW_LINE);

    console.log(str);
}

function info(message) {
    log(message);
}

function error(message) {
    log("ERROR: " + message);
}

const requestBlacklist = [ "/libraries", "/app", "/images", "/stylesheets" ];

function request(req, res, timeMs) {
    for (const bl of requestBlacklist) {
        if (req.url.startsWith(bl)) {
            return;
        }
    }

    if (req.url.includes(".js.map") || req.url.includes(".css.map")) {
        return;
    }

    info((timeMs >= 10 ? "Slow " : "") +
        res.statusCode + " " + req.method + " " + req.url + " took " + timeMs + "ms");
}

function pad(num) {
    num = Math.floor(num);

    return num < 10 ? ("0" + num) : num.toString();
}

function padMilli(num) {
    if (num < 10) {
        return "00" + num;
    }
    else if (num < 100) {
        return "0" + num;
    }
    else {
        return num.toString();
    }
}

function formatTime(millisSinceMidnight) {
    return pad(millisSinceMidnight / HOUR)
        + ":" + pad((millisSinceMidnight % HOUR) / MINUTE)
        + ":" + pad((millisSinceMidnight % MINUTE) / SECOND)
        + "." + padMilli(millisSinceMidnight % SECOND);
}

function formatDate() {
    return pad(todaysMidnight.getFullYear())
        + "-" + pad(todaysMidnight.getMonth() + 1)
        + "-" + pad(todaysMidnight.getDate());
}

module.exports = {
    info,
    error,
    request
};