import { EMBER_LIBRARIES_ISREGISTERED } from '@ember/canary-features';
import { debug, warn } from '@ember/debug';
import { DEBUG } from '@glimmer/env';
import VERSION from 'ember/version';
import { get } from './property_get';
/**
 @module ember
*/
/**
  Helper class that allows you to register your library with Ember.

  Singleton created at `Ember.libraries`.

  @class Libraries
  @constructor
  @private
*/
export class Libraries {
    constructor() {
        this._registry = [];
        this._coreLibIndex = 0;
    }
    _getLibraryByName(name) {
        let libs = this._registry;
        let count = libs.length;
        for (let i = 0; i < count; i++) {
            if (libs[i].name === name) {
                return libs[i];
            }
        }
        return undefined;
    }
    register(name, version, isCoreLibrary) {
        let index = this._registry.length;
        if (!this._getLibraryByName(name)) {
            if (isCoreLibrary) {
                index = this._coreLibIndex++;
            }
            this._registry.splice(index, 0, { name, version });
        }
        else {
            warn(`Library "${name}" is already registered with Ember.`, false, {
                id: 'ember-metal.libraries-register',
            });
        }
    }
    registerCoreLibrary(name, version) {
        this.register(name, version, true);
    }
    deRegister(name) {
        let lib = this._getLibraryByName(name);
        let index;
        if (lib) {
            index = this._registry.indexOf(lib);
            this._registry.splice(index, 1);
        }
    }
}
if (EMBER_LIBRARIES_ISREGISTERED) {
    Libraries.prototype.isRegistered = function (name) {
        return !!this._getLibraryByName(name);
    };
}
if (DEBUG) {
    Libraries.prototype.logVersions = function () {
        let libs = this._registry;
        let nameLengths = libs.map(item => get(item, 'name.length'));
        let maxNameLength = Math.max.apply(null, nameLengths);
        debug('-------------------------------');
        for (let i = 0; i < libs.length; i++) {
            let lib = libs[i];
            let spaces = new Array(maxNameLength - lib.name.length + 1).join(' ');
            debug([lib.name, spaces, ' : ', lib.version].join(''));
        }
        debug('-------------------------------');
    };
}
const LIBRARIES = new Libraries();
LIBRARIES.registerCoreLibrary('Ember', VERSION);
export default LIBRARIES;