package main

import (
	"bytes"
	"fmt"
	"log"
	"net/http"
	"os"
	"strconv"

	"github.com/joho/godotenv"
	"github.com/yuin/goldmark"
	"github.com/yuin/goldmark/extension"
	"github.com/yuin/goldmark/parser"
	"github.com/yuin/goldmark/renderer/html"
)

var mdParser goldmark.Markdown

func mdServe(w http.ResponseWriter, r *http.Request) {
	if r.Method != "POST" {
		w.WriteHeader(405)
		w.Write([]byte("Method Not Allowed"))
		return
	}

	err := r.ParseForm()
	if err != nil {
		w.WriteHeader(500)
		w.Write([]byte("Failed to retrieve form data"))
		return
	}

	var buf bytes.Buffer
	
	log.Print(r.Form)
	md := r.PostForm.Get("raw")
	log.Print(md)
	err = mdParser.Convert([]byte(md), &buf)
	if err != nil {
		w.WriteHeader(500)
		w.Write([]byte("Failed to compile markdown into html"))
		return
	}

	w.Write([]byte(md))
}

func main() {
	err := godotenv.Load()
	if err != nil {
		log.Fatal("Failed to load env")
	}

	mdParser = goldmark.New(
		goldmark.WithExtensions(
			extension.GFM,
			extension.Footnote,
			extension.Typographer,
		),
		goldmark.WithParserOptions(
			parser.WithAutoHeadingID(),
		),
		goldmark.WithRendererOptions(
			html.WithHardWraps(),
		),
	)

	router := http.NewServeMux()
	router.HandleFunc("/", mdServe)

	appPort, err := strconv.ParseUint(os.Getenv("parser_port"), 10, 64)
	if err != nil {
		appPort = 5006
	}

	srv := &http.Server{
		Addr: fmt.Sprintf(":%d", appPort),
		Handler: router,
	}

	err = srv.ListenAndServe()
	log.Fatal(err)
}