import {ResponseFactory} from './ResponseFactory'
import {Request} from '../lifecycle/Request'

/**
 * Helper function to create a new JSONResponseFactory of the given value.
 * @param value
 */
export function json(value: unknown): JSONResponseFactory {
    return new JSONResponseFactory(value)
}

/**
 * Response factory that writes the given object as JSON to the response.
 */
export class JSONResponseFactory extends ResponseFactory {
    constructor(
        public readonly value: unknown,
    ) {
        super()
    }

    public async write(request: Request): Promise<Request> {
        request = await super.write(request)
        request.response.setHeader('Content-Type', 'application/json')
        request.response.body = JSON.stringify(this.value)
        return request
    }
}