package main

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
	"os"
	"os/exec"
	"path"
	"path/filepath"
	"runtime"
	"strconv"
	"strings"
	"time"

	"github.com/gorilla/mux"
)

var config = readConfig("")

// our main function
func main() {

	// Ausgeben der Config-Optionen
	fmt.Println("Host: " + config.Host)
	fmt.Println("Post: " + config.Port)
	fmt.Println("Template: " + config.Template)
	fmt.Println("MQTTServer: " + config.MQTTServer)
	fmt.Println("MQTTPort: " + strconv.Itoa(config.MQTTPort))
	fmt.Println("OS: " + config.OS)

	router := mux.NewRouter()
	//router.HandleFunc("/_api/md/{pagename:.*}", getRawPage).Methods("GET")
	router.HandleFunc("/_api/config", getConfig).Methods("GET")
	router.HandleFunc("/_api/aufnahme", getAufnahme).Methods("GET")
	router.HandleFunc("/_api/aufnahme", postAufnahme).Methods("POST")
	router.HandleFunc("/_api/kamerabild", getKamerabild).Methods("GET")
	router.HandleFunc("/_api/fotoliste", getFotoliste).Methods("GET")
	router.PathPrefix("/pic/").Handler(http.StripPrefix("/pic/", http.FileServer(http.Dir("pic")))).Methods("GET")
	router.PathPrefix("/").Handler(http.FileServer(http.Dir("web"))).Methods("GET")

	log.Fatal(http.ListenAndServe(":"+config.Port, router))

}

func getConfig(w http.ResponseWriter, r *http.Request) {
	json.NewEncoder(w).Encode(config)
}

func getAufnahme(w http.ResponseWriter, r *http.Request) {

	// raspistill -t 99999999 -p '100,140,800,600'
	if config.OS == "linux" {
		cmd := exec.Command("killall", "raspistill")
		err := cmd.Run()
		check(err)

		//cmd = exec.Command("/usr/bin/raspistill", "-t 1 -o /home/pi/fbox/pic/tmp.jpg")
		//cmd = exec.Command("bash", "-c", `/usr/bin/raspistill -p '100,140,800,600' -t 1 -o /home/pi/fbox/pic/tmp.jpg`)
		cmd = exec.Command("bash", "-c", `/usr/bin/raspistill -op 0 -p '100,140,800,600' -t 1 -o /home/pi/fbox/pic/tmp.jpg`)
		err = cmd.Run()
		check(err)
	} else {
		copyfile("./pic/Testbild.jpg", "./pic/tmp.jpg")
	}

	json.NewEncoder(w).Encode("tmp.jpg")
}

func postAufnahme(w http.ResponseWriter, r *http.Request) {

	//fmt.Println("YYYY-MM-DD : ", currentTime.Format("2006-01-02"))
	currentTime := time.Now()
	Ordner := currentTime.Format("2006-01-02")
	if !directoryExists(Ordner) {
		os.MkdirAll(path.Join("/home/pi/fbox/pic", Ordner), os.ModePerm)
	}

	//fmt.Println("YYYY-MM-DD hh:mm:ss : ", currentTime.Format("2006-01-02 15:04:05"))
	Foto := currentTime.Format("150405")
	copyfile("./pic/tmp.jpg", path.Join("/home/pi/fbox/pic", Ordner, Foto+".jpg"))

	json.NewEncoder(w).Encode(path.Join(Ordner, Foto+".jpg"))
}

func getKamerabild(w http.ResponseWriter, r *http.Request) {
	if config.OS == "linux" {
		//cmd := exec.Command("/usr/bin/raspistill", "-t 99999999 -p '100,140,800,600'")
		cmd := exec.Command("bash", "-c", `/usr/bin/raspistill -t 99999999 -p '100,140,800,600'`)
		err := cmd.Run()
		check(err)
	}

	json.NewEncoder(w).Encode("OK")
}

func getFotoliste(w http.ResponseWriter, r *http.Request) {

	//Livestream der Kamera beenden
	if config.OS == "linux" {
		cmd := exec.Command("killall", "raspistill")
		err := cmd.Run()
		check(err)
	}

	// Datum der config auslesen
	f, err := os.Open("./config.json")
	check(err)
	statinfo, err := f.Stat()
	check(err)
	ConfigTime := statinfo.ModTime()
	//fmt.Println(ConfigTime)

	// Dateien herausfinden die neuer als das Config-Datm sind
	//picfiles, err := ioutil.ReadDir("./pic")
	//check(err)
	var files []string

	filepath.Walk("./pic", func(filepath string, file os.FileInfo, err error) error {
		tmpPath := strings.Replace(filepath, "\\", "/", -1)

		if file.Mode().IsRegular() {
			//if file.ModTime() > ConfigTime {
			//fmt.Print(file.Name() + ": ")
			//fmt.Println(file.ModTime())
			if file.Name() != "Testbild.jpg" && file.Name() != "TestbildKamera.jpg" && file.Name() != "tmp.jpg" {
				if inTimeSpan(ConfigTime, time.Now(), file.ModTime()) {
					files = append(files, tmpPath)
				}
			}
		}

		return nil
	})

	/*
		for _, file := range picfiles {
			if file.Mode().IsRegular() {
				//if file.ModTime() > ConfigTime {
				fmt.Print(file.Name() + ": ")
				fmt.Println(file.ModTime())
				if inTimeSpan(ConfigTime, time.Now(), file.ModTime()) {
					files = append(files, file.Name())
				}
			}
		}
	*/

	json.NewEncoder(w).Encode(files)
}

//--------------------------------------------------------------------------
// Typen
//--------------------------------------------------------------------------
type Configuration struct {
	Host       string
	Port       string
	Template   string
	MQTTServer string
	MQTTPort   int
	OS         string
}

//--------------------------------------------------------------------------
// Hilfsfunktionen
//--------------------------------------------------------------------------
func check(e error) {
	if e != nil {
		fmt.Println(e)
	}
}

func fileExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return !info.IsDir()
}

func directoryExists(filename string) bool {
	info, err := os.Stat(filename)
	if os.IsNotExist(err) {
		return false
	}
	return info.IsDir()
}

func copyfile(source string, destination string) {
	input, err := ioutil.ReadFile(source)
	check(err)
	err = ioutil.WriteFile(destination, input, 0644)
	check(err)
}

func readConfig(filename string) *Configuration {
	// initialize conf with default values.
	conf := &Configuration{
		Host:       "http://127.0.0.1",
		Port:       "8000",
		Template:   "default",
		MQTTServer: "127.0.0.1",
		MQTTPort:   8080,
		OS:         runtime.GOOS,
	}

	b, err := ioutil.ReadFile("./config.json")
	if err != nil {
		return conf
	}
	if err = json.Unmarshal(b, conf); err != nil {
		return conf
	}
	return conf
}

func inTimeSpan(start, end, check time.Time) bool {
	return check.After(start) && check.Before(end)
}