// Copyright © 2013 Steve Francia <spf@spf13.com>.
//
// Licensed under the Simple Public 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://opensource.org/licenses/Simple-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 commands

import (
	"fmt"
	"net"
	"net/http"
	"os"
	"strconv"
	"strings"

	"github.com/spf13/cobra"
	"github.com/spf13/hugo/helpers"
	jww "github.com/spf13/jwalterweatherman"
	"github.com/spf13/viper"
)

var serverPort int
var serverWatch bool
var serverAppend bool
var disableLiveReload bool

//var serverCmdV *cobra.Command

var serverCmd = &cobra.Command{
	Use:   "server",
	Short: "Hugo runs its own webserver to render the files",
	Long: `Hugo is able to run its own high performance web server.
Hugo will render all the files defined in the source directory and
Serve them up.`,
	//Run: server,
}

func init() {
	serverCmd.Flags().IntVarP(&serverPort, "port", "p", 1313, "port to run the server on")
	serverCmd.Flags().BoolVarP(&serverWatch, "watch", "w", false, "watch filesystem for changes and recreate as needed")
	serverCmd.Flags().BoolVarP(&serverAppend, "appendPort", "", true, "append port to baseurl")
	serverCmd.Flags().BoolVar(&disableLiveReload, "disableLiveReload", false, "watch without enabling live browser reload on rebuild")
	serverCmd.Run = server
}

func server(cmd *cobra.Command, args []string) {
	InitializeConfig()

	if BaseUrl == "" {
		BaseUrl = "http://localhost"
	}

	if cmd.Flags().Lookup("disableLiveReload").Changed {
		viper.Set("DisableLiveReload", disableLiveReload)
	}

	if serverWatch {
		viper.Set("Watch", true)
	}

	if !strings.HasPrefix(BaseUrl, "http://") {
		BaseUrl = "http://" + BaseUrl
	}

	l, err := net.Listen("tcp", ":"+strconv.Itoa(serverPort))
	if err == nil {
		l.Close()
	} else {
		jww.ERROR.Println("port", serverPort, "already in use, attempting to use an available port")
		sp, err := helpers.FindAvailablePort()
		if err != nil {
			jww.ERROR.Println("Unable to find alternative port to use")
			jww.ERROR.Fatalln(err)
		}
		serverPort = sp.Port
	}

	viper.Set("port", serverPort)

	if serverAppend {
		viper.Set("BaseUrl", strings.TrimSuffix(BaseUrl, "/")+":"+strconv.Itoa(serverPort))
	} else {
		viper.Set("BaseUrl", strings.TrimSuffix(BaseUrl, "/"))
	}

	build(serverWatch)

	// Watch runs its own server as part of the routine
	if serverWatch {
		jww.FEEDBACK.Println("Watching for changes in", helpers.AbsPathify(viper.GetString("ContentDir")))
		err := NewWatcher(serverPort)
		if err != nil {
			fmt.Println(err)
		}
	}

	serve(serverPort)
}

func serve(port int) {
	jww.FEEDBACK.Println("Serving pages from " + helpers.AbsPathify(viper.GetString("PublishDir")))
	jww.FEEDBACK.Printf("Web Server is available at %s\n", viper.GetString("BaseUrl"))
	fmt.Println("Press ctrl+c to stop")

	http.Handle("/", http.FileServer(http.Dir(helpers.AbsPathify(viper.GetString("PublishDir")))))
	err := http.ListenAndServe(":"+strconv.Itoa(port), nil)
	if err != nil {
		jww.ERROR.Printf("Error: %s\n", err.Error())
		os.Exit(1)
	}
}