package main

import (
	"errors"
	"fmt"
	"io"
	"net/http"
	"os"
)

func http_HandleFunc(url_path string, filepath string, is_mainpage bool, content_type string) {
	if is_mainpage {
		http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
			w.Header().Add("Content-Type", content_type)
			io.WriteString(w, html_replacer(file_read(filepath)))
		})
	} else {
		s := new(submit)
		s.data = "null"
		http.HandleFunc("/"+url_path, func(w http.ResponseWriter, r *http.Request) {
			if r.Method == "POST" {
				if err := r.ParseForm(); err != nil {
					fmt.Fprintf(w, "ParseForm() err: %v", err)
					return
				}
			}

			w.Header().Add("Content-Type", content_type)

			io.WriteString(w, html_replacer(file_read(filepath)))
		})
	}
}

func http_start(address string) { // address could be = ":8080"
	handler()

	err := http.ListenAndServe(address, nil)

	if errors.Is(err, http.ErrServerClosed) {
		fmt.Printf("server closed\n")
	} else if err != nil {
		fmt.Printf("error starting server: %s\n", err)
		os.Exit(1)
	}
}