package main

import (
	"bytes"
	"encoding/json"
	"errors"
	"fmt"
	"html/template"
	"io"
	"net/http"
	"path"
)

type Result struct {
	Exist   bool   `json:"exist"`
	Message string `json:"message"`
}

func main() {
	// Setup handlers
	mux := http.NewServeMux()
	mux.HandleFunc("/", getRoot)
	mux.HandleFunc("/result", getResult)

	// Server static files (css)
	mux.Handle("/static/", http.StripPrefix("/static/", http.FileServer(http.Dir("static"))))

	// Setup the server
	err := http.ListenAndServe(":3333", mux)
	if errors.Is(err, http.ErrServerClosed) {
		fmt.Println("server closed")
	} else if err != nil {
		panic(err)
	}
}

func getResult(w http.ResponseWriter, r *http.Request) {
	// Get the url from query
	url := r.URL.Query().Get("url")
	if url == "" {
		fmt.Println("got /result request")
		io.WriteString(w, "This is result page!")
		return
	}

	// Url to send request to
	iffy_url := "https://iffy.cert.hr/validate"

	// Json to send
	jsonString := `{"match": "` + url + `"}`
	jsonData := []byte(jsonString)

	// Creating a http request, and making a http request
	request, err := http.NewRequest("POST", iffy_url, bytes.NewBuffer(jsonData))
	request.Header.Set("Content-type", "application/json")

	client := &http.Client{}
	response, err := client.Do(request)
	if err != nil {
		panic(err)
	}

	// Read the body request
	defer response.Body.Close()
	body, _ := io.ReadAll(response.Body)

	var result Result

	// Read the json parse it
	if err := json.Unmarshal(body, &result); err != nil {
		panic(err)
	}

	fmt.Println("got /result request")
	fmt.Println(result.Message)

	// Get the html template and serve it
	fp := path.Join("templates", "result.html")
	tmpl, err := template.ParseFiles(fp)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if err := tmpl.Execute(w, result); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}

func getRoot(w http.ResponseWriter, r *http.Request) {
	fmt.Println("got / request")

	// Get the html template and serve it
	fp := path.Join("templates", "index.html")
	tmpl, err := template.ParseFiles(fp)
	if err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
		return
	}

	if err := tmpl.Execute(w, nil); err != nil {
		http.Error(w, err.Error(), http.StatusInternalServerError)
	}
}