package controllers

import play.api.*
import _root_.controllers.authentication.{AuthenticatedAction, AuthenticatedRequest}
import _root_.controllers.caching.{CheckFresh, DigestEtagable}
import models.User
import play.api.libs.json.Json
import play.api.mvc.*

import java.io.DataOutputStream
import java.nio.charset.StandardCharsets.UTF_8
import javax.inject.*

/**
 * This controller creates an `Action` to handle HTTP requests to the
 * application's home page.
 */
@Singleton
class HomeController @Inject()(val controllerComponents: ControllerComponents,
                               authenticatedAction: AuthenticatedAction)
  extends BaseController with Logging with CheckFresh {

  /**
   * Create an Action to render an HTML page.
   *
   * The configuration in the `routes` file means that this method
   * will be called when the application receives a `GET` request with
   * a path of `/`.
   */
  def index() = Action { implicit request: Request[AnyContent] =>
    Ok(views.html.index())
  }

  def userData = authenticatedAction { implicit request: AuthenticatedRequest[AnyContent] =>
    val user = request.user
    checkFresh(user) {
      // TODO: put the max-age somewhere into config
      Ok(Json.toJson(user)).withHeaders("Cache-Control" -> "private, max-age=15, must-revalidate")
    }
  }

  private given DigestEtagable[models.User] with {
    override protected def writeDigestData(a: User, s: DataOutputStream): Unit = {
      s.writeLong(a.id.getOrElse(0))
      s.write(a.gid.getBytes(UTF_8))
      s.write(a.username.getBytes(UTF_8))
    }
  }
}