package main

import (
	"bufio"
	"flag"
	"fmt"
	"net/http"
	"os"
	"strings"
)

func main() {
	helpFlag := flag.Bool("help", false, "Show help information")
	verboseFlag := flag.Bool("verbose", false, "Print more information")
	repoFlag := flag.String("repo", "https://neueland.iserlohn-fortress.net/smolbote/downloads", "Repository path")
	dryRunFlag := flag.Bool("dry-run", false, "Dry run: only check files, do not download")

	flag.Parse()

	// help flag --> show usage and exit
	if *helpFlag {
		fmt.Println("Usage:")
		flag.PrintDefaults()
		os.Exit(0)
	}

	manifestPath := *repoFlag + "/windows-sha512.txt"
	repoPath := *repoFlag + "/windows/"

	if *verboseFlag {
		fmt.Println("repoFlag =", *repoFlag)
		fmt.Println("manifest =", manifestPath)
		fmt.Println("repoPath =", repoPath)
	}

	response, err := http.Get(manifestPath)
	if err != nil {
		panic(err)
	}
	defer response.Body.Close()

	scanner := bufio.NewScanner(response.Body)
	for scanner.Scan() {
		s := strings.Split(scanner.Text(), "  ")

		filepath := s[1]
		checksum := s[0]

		state, err := checkFile(filepath, checksum)
		if err != nil {
			panic(err)
		}

		if state {
			fmt.Printf("[%s] passed\n", filepath)
		} else {
			fmt.Printf("[%s] missing or mismatching\n", filepath)
			if !*dryRunFlag {
				downloadFile(filepath, repoPath+filepath)
			}
		}
	}

}