package main

import (
	"fmt"
	"net/http"
	"os"
	"strconv"
	"strings"

	"forge.arimelody.space/ari/indir/log"
	"forge.arimelody.space/ari/indir/web"
)

func main() {
	if len(os.Args) < 2 { printHelp() }

	host := "127.0.0.1"
	port := 8080
	root := "/"

	filesDir := ""
	i := 1
	for {
		if i >= len(os.Args) { break }
		switch os.Args[i] {
		case "-h":
			fallthrough
		case "--help":
			printHelp()

		case "--host":
			if i + 1 >= len(os.Args) {
				fmt.Fprintf(os.Stderr, "fatal: --host argument cannot be empty\n")
				os.Exit(1)
			}
			i++
			host = os.Args[i]

		case "--port":
			if i + 1 >= len(os.Args) {
				fmt.Fprintf(os.Stderr, "fatal: --port argument cannot be empty\n")
				os.Exit(1)
			}
			i++
			var err error
			port, err = strconv.Atoi(os.Args[i])
			if err != nil {
				fmt.Fprintf(os.Stderr, "fatal: failed to parse port %s: %v\n", os.Args[i], err)
				os.Exit(1)
			}

		case "--root":
			if i + 1 >= len(os.Args) {
				fmt.Fprintf(os.Stderr, "fatal: --root argument cannot be empty\n")
				os.Exit(1)
			}
			i++
			root = os.Args[i]
			if !strings.HasPrefix(root, "/") { root = "/" + root }
			if !strings.HasSuffix(root, "/") { root += "/" }

		default:
			if len(filesDir) > 0 {
				fmt.Fprintf(os.Stderr, "unsupported argument: %s\n", os.Args[i])
				os.Exit(1)
			}
			filesDir = os.Args[i]
		}
		i++
	}

	if len(filesDir) == 0 {
		filesDir = "."
	}

	ignoredFiles := []string{
		".",
		".DS_Store",
	}

	fmt.Printf("Now hosting \"%s\" at http://%s:%d", filesDir, host, port)
	if root != "/" { fmt.Printf("%s", root) }
	fmt.Println(".")

	app := web.AppState{
		Root: root,
		FilesDir: filesDir,
		IgnoredFiles: ignoredFiles,
	}

	http.ListenAndServe(
		fmt.Sprintf("%s:%d", host, port),
		log.HTTPLog(web.Handler(&app)),
	)
}

func printHelp() {
	fmt.Printf(
		`indir [--host address] [--port port] [--root http_root] directory

	--help              shows this help message
	--host address      hosts on the specified address
	--port port         hosts on the specified port
	--root http_root    hosts on the specified subdirectory, i.e. `+"`/files/`\n",
	)
	os.Exit(0)
}