import {Application} from './Application'
import {Container, Injectable, TypedDependencyKey} from '../di'

/**
 * Base type for a class that supports binding methods by string.
 */
export interface Bindable {
    getBoundMethod(methodName: string): (...args: any[]) => any
}

/**
 * Returns true if the given object is bindable.
 * @param what
 * @return boolean
 */
export function isBindable(what: unknown): what is Bindable {
    return (
        Boolean(what)
        && typeof (what as any).getBoundMethod === 'function'
        && (what as any).getBoundMethod.length === 1
        && typeof (what as any).getBoundMethod('getBoundMethod') === 'function'
    )
}

/**
 * Base for classes that gives access to the global application and container.
 */
@Injectable()
export class AppClass {
    /** The global application instance. */
    private get appClassApplication(): Application {
        return Application.getApplication()
    }

    /** Get the global Application. */
    protected app(): Application {
        return this.appClassApplication
    }

    /** Get the global Container. */
    protected container(): Container {
        return this.appClassApplication
    }

    /** Call the `make()` method on the global container. */
    protected make<T>(target: TypedDependencyKey<T>, ...parameters: any[]): T {
        return this.container().make<T>(target, ...parameters)
    }

    /**
     * Get the method with the given name from this class, bound to this class.
     * @param {string} methodName
     * @return function
     */
    public getBoundMethod(methodName: string): (...args: any[]) => any {
        if ( typeof (this as any)[methodName] !== 'function' ) {
            throw new TypeError(`Attempt to get bound method for non-function type: ${methodName}`)
        }

        return (...args: any[]): any => {
            return (this as any)[methodName](...args)
        }
    }
}