package main

import (
	"bytes"
	"embed"
	"encoding/csv"
	"fmt"
	"html/template"
	"log"
	"net/http"
	"os"
	"strings"
	"time"
)

type EmojiDetails struct {
	Label string
	Url   string
}

//go:embed templates
var indexHTML embed.FS

func handleForm(w http.ResponseWriter, r *http.Request) {
	tmpl := template.Must(template.ParseFS(indexHTML, "templates/index.html"))

	if r.Method != http.MethodPost {
		tmpl.Execute(w, nil)
		return
	}

	details := EmojiDetails{
		Label: r.FormValue("label"),
		Url:   r.FormValue("url"),
	}

	now := time.Now().UTC().Format(time.RFC3339)
	entry := strings.Join([]string{now, "unknown", details.Label, details.Url}, ",")
	insertEntry(entry)

	tmpl.Execute(w, struct{ Success bool }{true})
}

func handleRequested(w http.ResponseWriter, r *http.Request) {
	tmpl := template.Must(template.ParseFS(indexHTML, "templates/requested.html"))
	file, _ := os.ReadFile("requests.txt")
	requests, _ := csv.NewReader(bytes.NewReader(file)).ReadAll()

	tmpl.Execute(w, struct{ Requests [][]string }{requests})
}

func setupRoutes() {
	http.HandleFunc("/", handleForm)
	http.HandleFunc("/requested", handleRequested)
	http.ListenAndServe(":8080", nil)
}

func insertEntry(entry string) {
	f, err := os.OpenFile("requests.txt",
		os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
	if err != nil {
		log.Println(err)
	}
	defer f.Close()
	entryFormatted := fmt.Sprintf("%s\n", entry)
	if _, err := f.WriteString(entryFormatted); err != nil {
		log.Println(err)
	}
}

func main() {
	setupRoutes()
}