// Copyright 2018 Tamás Demeter-Haludka
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package delaymw

import (
	"net/http"
	"time"

	"github.com/alien-bunny/ab/lib/middleware"
)

const MIDDLEWARE_DEPENDENCY_DELAY = "*delaymw.DelayMiddelware"

var _ middleware.Middleware = &DelayMiddelware{}

// DelayMiddelware blocks the execution for d duration.
//
// This middleware can be useful for testing / debugging purposes.
type DelayMiddelware struct {
	duration time.Duration
	middleware.NoDependencies
}

func New(d time.Duration) *DelayMiddelware {
	return &DelayMiddelware{
		duration: d,
	}
}

func (d *DelayMiddelware) Wrap(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		<-time.After(d.duration)
		next.ServeHTTP(w, r)
	})
}
