const tmp = require('tmp');
const dir = tmp.dirSync();
let settings;
const fs = require('fs');
const path = require('path');
const data = require('./stub/data');
let stdOutWriteOriginal;
const {rimrafSync} = require('rimraf');
const Transport = require('winston-transport');

describe('Logger', () => {
    beforeEach(async () => {
        data.writeDefaultConfiguration();
        jest.resetModules();
        settings = require('../lib/util/settings');
        settings.set(['advanced', 'log_directory'], dir.name + '/%TIMESTAMP%');
        settings.reRead();
        stdOutWriteOriginal = console._stdout.write;
        console._stdout.write = () => {};
    });

    afterEach(async () => {
        console._stdout.write = stdOutWriteOriginal;
    });

    it('Create log directory', () => {
        const logger = require('../lib/util/logger').default;
        const dirs = fs.readdirSync(dir.name);
        expect(dirs.length).toBe(1);
    });

    it('Should cleanup', () => {
        const logger = require('../lib/util/logger').default;

        for (const d of fs.readdirSync(dir.name)) {
            rimrafSync(path.join(dir.name, d));
        }

        for (let i = 0; i < 21; i++) {
            fs.mkdirSync(path.join(dir.name, `log_${i}`));
        }

        expect(fs.readdirSync(dir.name).length).toBe(21);
        logger.cleanup();
        expect(fs.readdirSync(dir.name).length).toBe(10);
    })

    it('Should not cleanup when there is no timestamp set', () => {
        const logger = require('../lib/util/logger').default;
        for (let i = 30; i < 40; i++) {
            fs.mkdirSync(path.join(dir.name, `log_${i}`));
        }

        settings.set(['advanced', 'log_directory'], dir.name + '/bla');
        expect(fs.readdirSync(dir.name).length).toBe(21);
        logger.cleanup();
        expect(fs.readdirSync(dir.name).length).toBe(21);
    })

    it('Set and get log level', () => {
        const logger = require('../lib/util/logger').default;
        logger.setLevel('debug');
        expect(logger.getLevel()).toBe('debug');
        logger.setLevel('info');
        expect(logger.getLevel()).toBe('info');
        logger.setLevel('warning');
        expect(logger.getLevel()).toBe('warn');// match old Z2M levels
        logger.setLevel('warn');
        expect(logger.getLevel()).toBe('warn');// match old Z2M levels
        logger.setLevel('error');
        expect(logger.getLevel()).toBe('error');
    });

    it('Set warning when log level is warn', () => {
        settings.set(['advanced', 'log_level'], 'warn');
        settings.reRead();
        const logger = require('../lib/util/logger').default;
        expect(logger.level).toBe('warning');// getLevel() reports old Z2M level to match display/value
        settings.set(['advanced', 'log_level'], 'info');
        settings.reRead();
    });

    it('Add/remove transport', () => {
        class DummyTransport extends Transport {
            log(info, callback) {
            }
        }

        const logger = require('../lib/util/logger').default;
        expect(logger.winston.transports.length).toBe(2);
        const transport = new DummyTransport();
        logger.addTransport(transport);
        expect(logger.winston.transports.length).toBe(3);
        logger.removeTransport(transport);
        expect(logger.winston.transports.length).toBe(2);
    });

    it('Logger should be console and file by default', () => {
        const logger = require('../lib/util/logger').default;
        const pipes = logger.winston._readableState.pipes;
        expect(pipes.length).toBe(2);
        expect(pipes[0].constructor.name).toBe('Console');
        expect(pipes[0].silent).toBe(false);
        expect(pipes[1].constructor.name).toBe('File');
        expect(pipes[1].dirname.startsWith(dir.name)).toBeTruthy();
    });

    it('Logger can be file only', () => {
        settings.set(['advanced', 'log_output'], ['file']);
        const logger = require('../lib/util/logger').default;
        const pipes = logger.winston._readableState.pipes;
        expect(pipes.length).toBe(2);
        expect(pipes[0].constructor.name).toBe('Console');
        expect(pipes[0].silent).toBe(true);
        expect(pipes[1].constructor.name).toBe('File');
        expect(pipes[1].dirname.startsWith(dir.name)).toBeTruthy();
    });

    it('Logger can be console only', () => {
        settings.set(['advanced', 'log_output'], ['console']);
        const logger = require('../lib/util/logger').default;
        const pipes = logger.winston._readableState.pipes;
        expect(pipes.constructor.name).toBe('Console');
        expect(pipes.silent).toBe(false);
    });

    it('Logger can be nothing', () => {
        settings.set(['advanced', 'log_output'], []);
        const logger = require('../lib/util/logger').default;
        const pipes = logger.winston._readableState.pipes;
        expect(pipes.constructor.name).toBe('Console');
        expect(pipes.silent).toBe(true);
    });

    it('Should allow to disable log rotation', () => {
        settings.set(['advanced', 'log_rotation'], false);
        const logger = require('../lib/util/logger').default;
        const pipes = logger.winston._readableState.pipes;
        expect(pipes[1].constructor.name).toBe('File');
        expect(pipes[1].maxFiles).toBeNull();
        expect(pipes[1].tailable).toBeFalsy();
        expect(pipes[1].maxsize).toBeNull();
    });

    it('Should allow to symlink logs to current directory', () => {
        settings.set(['advanced', 'log_symlink_current'], true);
        let logger = require('../lib/util/logger').default;
        expect(fs.readdirSync(dir.name).includes('current')).toBeTruthy()

        jest.resetModules();
        logger = require('../lib/util/logger').default;
    });

    it('Log', () => {
        const logger = require('../lib/util/logger').default;
        logger.setLevel('debug');

        const debug = jest.spyOn(logger.winston, 'debug');
        logger.debug('debug');
        expect(debug).toHaveBeenCalledWith('debug', {namespace: 'z2m'});
        expect(debug).toHaveBeenCalledTimes(1);

        const info = jest.spyOn(logger.winston, 'info');
        logger.info('info');
        expect(info).toHaveBeenCalledWith('info', {namespace: 'z2m'});
        expect(info).toHaveBeenCalledTimes(1);

        const warning = jest.spyOn(logger.winston, 'warning');
        logger.warning('warning');
        expect(warning).toHaveBeenCalledWith('warning', {namespace: 'z2m'});
        expect(warning).toHaveBeenCalledTimes(1);

        const error = jest.spyOn(logger.winston, 'error');
        logger.error('error');
        expect(error).toHaveBeenCalledWith('error', {namespace: 'z2m'});

        logger.error(new Error('error'));// test for stack=true
        expect(error).toHaveBeenCalledWith('error', {namespace: 'z2m'});
        expect(error).toHaveBeenCalledTimes(2);
    });
});