import { Status, isStatus } from '../const/status.ts'
import { Unit } from './decorators.ts'
import { Collection } from '../collection/Collection.ts'
import {container, make} from '../../../di/src/global.ts'
import {DependencyKey} from "../../../di/src/type/DependencyKey.ts";
import Instantiable, {isInstantiable} from "../../../di/src/type/Instantiable.ts";

const isLifecycleUnit = (something: any): something is (typeof LifecycleUnit) => {
    return isInstantiable(something) && something.prototype instanceof LifecycleUnit
}

export default abstract class LifecycleUnit {
    private _status = Status.Stopped

    public get status() {
        return this._status
    }

    public set status(status) {
        this._status = status
    }

    public async up(): Promise<void> {};
    public async down(): Promise<void> {};

    public static get_dependencies(): Collection<typeof LifecycleUnit> {
        if ( isInstantiable(this) ) {
            const deps = new Collection<typeof LifecycleUnit>()
            for ( const dependency of container.get_dependencies(this) ) {
                if ( isLifecycleUnit(dependency) )
                    deps.push(dependency)
            }

            return deps
        }
        return new Collection<typeof LifecycleUnit>()
    }

    protected make<T>(target: Instantiable<T>|DependencyKey, ...parameters: any[]) {
        return make(target, ...parameters)
    }
}