package main

import (
	"encoding/json"
	"log"
	"net/http"

	"github.com/google/uuid"
	"github.com/gorilla/mux"
	"github.com/jinzhu/gorm"
	_ "github.com/jinzhu/gorm/dialects/postgres"
)

type Besucher struct {
	ID      string `json:"id"`
	Name    string `json:"name"`
	Message string `json:"message"`
	Come    bool   `json:"come"`
}

type App struct {
	db *gorm.DB
	r  *mux.Router
}

func (a *App) start() {
	a.db.AutoMigrate()

	a.r.HandleFunc("/besucher", a.getAllBesucher).Methods("GET")
	a.r.HandleFunc("/besucher", a.addBesucher).Methods("POST")
	log.Fatal(http.ListenAndServe(":3001", a.r))
}

func (a *App) getAllBesucher(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	var all []Besucher
	err := a.db.Find(&all).Error
	if err != nil {
		sendErr(w, http.StatusInternalServerError, err.Error())
		return
	}
	err = json.NewEncoder(w).Encode(all)
	if err != nil {
		sendErr(w, http.StatusInternalServerError, err.Error())
	}

}

func (a *App) addBesucher(w http.ResponseWriter, r *http.Request) {
	w.Header().Set("Content-Type", "application/json")
	var s Besucher
	err := json.NewDecoder(r.Body).Decode(&s)
	if err != nil {
		sendErr(w, http.StatusBadRequest, err.Error())
		return
	}
	s.ID = uuid.New().String()
	err = a.db.Save(&s).Error
	if err != nil {
		sendErr(w, http.StatusInternalServerError, err.Error())

	} else {
		w.WriteHeader(http.StatusCreated)
	}
}

func sendErr(w http.ResponseWriter, code int, message string) {
	resp, _ := json.Marshal(map[string]string{"error": message})
	http.Error(w, string(resp), code)
}