'use strict';

exports = module.exports = {
    addProfile,
    removeProfile
};

const assert = require('assert'),
    BoxError = require('./boxerror.js'),
    debug = require('debug')('collectd'),
    fs = require('fs'),
    path = require('path'),
    paths = require('./paths.js'),
    safe = require('safetydance'),
    shell = require('./shell.js');

const CONFIGURE_COLLECTD_CMD = path.join(__dirname, 'scripts/configurecollectd.sh');

function addProfile(name, profile, callback) {
    assert.strictEqual(typeof name, 'string');
    assert.strictEqual(typeof profile, 'string');
    assert.strictEqual(typeof callback, 'function');

    const configFilePath = path.join(paths.COLLECTD_APPCONFIG_DIR, `${name}.conf`);

    // skip restarting collectd if the profile already exists with the same contents
    const currentProfile = safe.fs.readFileSync(configFilePath, 'utf8') || '';
    if (currentProfile === profile) return callback(null);

    fs.writeFile(configFilePath, profile, function (error) {
        if (error) return callback(new BoxError(BoxError.FS_ERROR, `Error writing collectd config: ${error.message}`));

        shell.sudo('addCollectdProfile', [ CONFIGURE_COLLECTD_CMD, 'add', name ], {}, function (error) {
            if (error) return callback(new BoxError(BoxError.COLLECTD_ERROR, 'Could not add collectd config'));

            callback(null);
        });
    });

}

function removeProfile(name, callback) {
    assert.strictEqual(typeof name, 'string');
    assert.strictEqual(typeof callback, 'function');

    fs.unlink(path.join(paths.COLLECTD_APPCONFIG_DIR, `${name}.conf`), function (error) {
        if (error && error.code !== 'ENOENT') debug('Error removing collectd profile', error);

        shell.sudo('removeCollectdProfile', [ CONFIGURE_COLLECTD_CMD, 'remove', name ], {}, function (error) {
            if (error) return callback(new BoxError(BoxError.COLLECTD_ERROR, 'Could not remove collectd config'));

            callback(null);
        });
    });
}