package main

import (
	"fmt"
	"io"
	"log"
	"net/http"
	"net/url"
	"os"
	"path"

	"github.com/google/uuid"
)

const (
	databasePath = "db"
	hostURL      = "http://127.0.0.1:8080/"
	listenAddr   = ":8080"
	repoURL      = "https://git.ny4.dev/nyancat/pb"
)

func main() {
	if _, err := os.Stat(databasePath); os.IsNotExist(err) {
		err := os.Mkdir(databasePath, 0755)
		if err != nil {
			log.Fatalln(err)
		}
	}

	http.HandleFunc("/{$}", func(w http.ResponseWriter, r *http.Request) {
		switch r.Method {
		case http.MethodGet:
			fmt.Fprintf(w, `pb
usage: curl --data-binary @<file> %s
or:    cmd | curl --data-binary @- %s

(c) 2024 Guanran Wang, source code licensed under MIT.
%s
`, hostURL, hostURL, repoURL)
		case http.MethodPut, http.MethodPost:
			uuid, err := uuid.NewRandom()
			if err != nil {
				log.Fatalln(err)
			}

			body, err := io.ReadAll(r.Body)
			if err != nil {
				log.Fatalln(err)
			}

			os.WriteFile(path.Join("db", uuid.String()), body, 0644)
			url, err := url.JoinPath(hostURL, uuid.String())
			if err != nil {
				log.Fatalln(err)
			}
			fmt.Fprintf(w, url)
			log.Printf("paste created: uuid=%s", uuid.String())
		default:
			http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
		}
	})

	http.Handle("/", http.FileServer(http.Dir(databasePath)))

	log.Printf("Starting server on %s", listenAddr)
	log.Fatal(http.ListenAndServe(listenAddr, nil))
}