// Copyright 2019 Drone IO, Inc.
//
// 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.

// +build oss

package server

import (
	"context"
	"net/http"

	"golang.org/x/sync/errgroup"
)

// A Server defines parameters for running an HTTP server.
type Server struct {
	Acme    bool
	Addr    string
	Cert    string
	Key     string
	Host    string
	Handler http.Handler
}

// ListenAndServe initializes a server to respond to HTTP network requests.
func (s Server) ListenAndServe(ctx context.Context) error {
	if s.Key != "" {
		return s.listenAndServeTLS(ctx)
	}
	return s.listenAndServe(ctx)
}

func (s Server) listenAndServe(ctx context.Context) error {
	var g errgroup.Group
	s1 := &http.Server{
		Addr:    s.Addr,
		Handler: s.Handler,
	}
	g.Go(func() error {
		select {
		case <-ctx.Done():
			return s1.Shutdown(ctx)
		}
	})
	g.Go(func() error {
		return s1.ListenAndServe()
	})
	return g.Wait()
}

func (s Server) listenAndServeTLS(ctx context.Context) error {
	var g errgroup.Group
	s1 := &http.Server{
		Addr:    ":http",
		Handler: s.Handler,
	}
	s2 := &http.Server{
		Addr:    ":https",
		Handler: s.Handler,
	}
	g.Go(func() error {
		return s1.ListenAndServe()
	})
	g.Go(func() error {
		return s2.ListenAndServeTLS(
			s.Cert,
			s.Key,
		)
	})
	g.Go(func() error {
		select {
		case <-ctx.Done():
			s1.Shutdown(ctx)
			s2.Shutdown(ctx)
			return nil
		}
	})
	return g.Wait()
}