package main

import (
	"os"
	"regexp"
	"time"
	"strconv"
	"net/http"
	"html"
)

var post_number = 1

var users = make(map[string]int)

var reg, _ = regexp.Compile("</notice></p>")
var reg2, _ = regexp.Compile("<posts>((?s).+)</posts>")
var reglt, _ = regexp.Compile("<")
var reggt, _ = regexp.Compile(">")

var nip, _ = time.LoadLocation("Asia/Tokyo")

var notice = "<p><notice>Posts are deleted every 7 days. 10 posts, up to 400 characters each, per user daily.</notice></p>" 

func check(e error) {
	if e != nil {
		panic(e)
	}
}


func initial(w http.ResponseWriter, req *http.Request) {

	counter := 0
	value := "false"
	
	for _, c := range req.Cookies() {
		counter++
		value = c.Value
	}

	if  value == "false" || counter == 0 {
		http.Redirect(w, req, "http://[200:c5b0:cfeb:5db:c054:d66d:eb6f:7412]/rosa/", http.StatusFound)
	} else {
		http.Redirect(w, req, "http://[200:c5b0:cfeb:5db:c054:d66d:eb6f:7412]/nun/", http.StatusFound)
	}
}


func click(w http.ResponseWriter, req *http.Request) {
	
	prior, err := strconv.ParseBool(req.FormValue("deco"))
	check(err)

	current := strconv.FormatBool(!prior)

	cookie := &http.Cookie{
        Name:   "clicked",
        Value:  current,
        Path: "/",
    }

	http.SetCookie(w, cookie)
	
	http.Redirect(w, req, "http://[200:c5b0:cfeb:5db:c054:d66d:eb6f:7412]/bbs/", http.StatusFound)

}


func post(w http.ResponseWriter, req *http.Request) {

	if users[req.Header.Get("X-Real-IP")] < 10 {
		users[req.Header.Get("X-Real-IP")]++
		new_post(req.FormValue("post"))
	}
	
	http.Redirect(w, req, "http://[200:c5b0:cfeb:5db:c054:d66d:eb6f:7412]/bbs/", http.StatusFound)

}

func new_post(input string) {

	orig, err := os.ReadFile("/mnt/c/server/data/rosa/index.html")
	check(err); 
	origb, err := os.ReadFile("/mnt/c/server/data/nun/index.html")
	check(err); 

	input = filter(input)

	output_time := new_post_time()
	output := reg.ReplaceAll(orig, []byte("</notice></p>\n\n\t\t<time>" + output_time + "</time>\n\t\t" +
		"<p>" + input + "</p>"))
	outputb := reg.ReplaceAll(origb, []byte("</notice></p>\n\n\t\t<time>" + output_time + "</time>\n\t\t" +
		"<p>" + input + "</p>"))

	err = os.WriteFile("/mnt/c/server/data/rosa/index.html", output, 0644)
	check(err)
	err = os.WriteFile("/mnt/c/server/data/nun/index.html", outputb, 0644)
	check(err)

	post_number++
}

func filter(input string) string {

	if len(input) > 400 {
		input = input[:400]
	}

	input = html.EscapeString(input)

	return input
}

func new_post_time() string {

	now := time.Now().In(nip)
	return now.Format("1/2 15:04") + " | " + strconv.Itoa(post_number)
}

func reset_board() {  

	orig, err := os.ReadFile("/mnt/c/server/data/rosa/index.html")
	check(err); 
	
	origb, err := os.ReadFile("/mnt/c/server/data/nun/index.html")
	check(err); 


	output := reg2.ReplaceAll(orig, []byte("<posts>\n\t\t" + notice + "\n\n\t</posts>"))
	outputb := reg2.ReplaceAll(origb, []byte("<posts>\n\t\t" + notice + "\n\n\t</posts>"))


	err = os.WriteFile("/mnt/c/server/data/rosa/index.html", output, 0644)
	check(err)

	err = os.WriteFile("/mnt/c/server/data/nun/index.html", outputb, 0644)
	check(err)

	post_number = 1
}


func main() {

	go func() {
		for range time.Tick(168 * time.Hour) {
			reset_board()			
	}}()

	go func() {
		for range time.Tick(24 * time.Hour) {
			users = make(map[string]int) 
	}}()

	mux := http.NewServeMux()
	mux.HandleFunc("/bbs/", initial)
	mux.HandleFunc("/bbs/click/", click)
	mux.HandleFunc("/bbs/post/", post)
	
	if err := http.ListenAndServe(":8090", mux); err != nil {
    	panic(err)
	}
}