package main

import (
	"fmt"
	"os"
	"strings"
)

var endpoint string = "http://127.0.0.1:8080"

type Command struct {
	Names       []string // aliases: short + long
	Description string
	Handler     func(args []string)
}

var commands = []Command{
	{
		Names:       []string{"login", "l"},
		Description: "Log into the system",
		Handler: func(args []string) {
			fmt.Println("Executing login with args:", args)
		},
	},
	{
		Names:       []string{"auth", "authenticate"},
		Description: "Authenticate with a token",
		Handler:     authenticateMain,
	},
}

func printMainUsage() {
	fmt.Println("Usage:")
	fmt.Println("  upc <command> [options]")
	fmt.Println("\nAvailable commands:")

	for _, cmd := range commands {
		fmt.Printf("  %-20s %s\n", formatNames(cmd.Names), cmd.Description)
	}
}

func formatNames(names []string) string {
	return strings.Join(names, ", ")
}

func findCommand(name string) *Command {
	for _, cmd := range commands {
		for _, n := range cmd.Names {
			if n == name {
				return &cmd
			}
		}
	}
	return nil
}

func main() {

	if len(os.Args) < 2 {
		fmt.Println("Error: missing subcommand")
		printMainUsage()
		os.Exit(1)
	}

	subcommand := os.Args[1]

	cmd := findCommand(subcommand)
	if cmd == nil {
		fmt.Println("Error: unknown command:", subcommand)
		printMainUsage()
		os.Exit(1)
	}

	cmd.Handler(os.Args[2:])
}