package main

import (
	"fmt"
	"os"
	"strconv"
)

func main() {
	if len(os.Args) < 2 {
		fmt.Println("Usage: add <title> <author> | list | read <id>")
		return
	}

	lib, _ := LoadLibrary("books.json")

	switch os.Args[1] {
	case "add":
		if len(os.Args) < 4 {
			fmt.Println("Usage: add <title> <author>")
			return
		}
		lib.Add(os.Args[2], os.Args[3])
		lib.Save("books.json")
		fmt.Println("Buch hinzugefügt.")

	case "list":
		for _, b := range lib.Books {
			status := " "
			if b.Read {
				status = "✓"
			}
			fmt.Printf("[%s] %d: \"%s\" by %s\n", status, b.ID, b.Title, b.Author)
		}

	case "read":
		if len(os.Args) < 3 {
			fmt.Println("Geben Sie eine Buch-ID ein.")
			return
		}
		id, err := strconv.Atoi(os.Args[2])
		if err != nil {
			fmt.Println("Ungültige ID-Eingabe.")
			return
		}
		lib.MarkRead(id)
		lib.Save("books.json")
		fmt.Println("Buch als gelesen markiert.")
	}
}