package cli

import (
	"slices"
	state "v/state"
)

type Namespace struct {
	Label    string
	Commands map[string]Command
}

// Command definition for CLI subcommands.
type Command struct {
	Label       string
	Handler     func([]string, Flags, state.State) error
	Usage       string
	Description string
}

// Registers a command.
// This specifies a label that is used to route the user input to
// the right command, a handler that is called when the label is used,
// and usage/description details that get included in autogenerated help messaging.
func (n *Namespace) AddCommand(label string, handler func([]string, Flags, state.State) error, usage string, description string) *Namespace {
	if n.Commands == nil {
		n.Commands = map[string]Command{}
	}

	n.Commands[label] = Command{Label: label, Handler: handler, Usage: usage, Description: description}

	return n
}

// Returns an alpha-ordered list of commands in the namespace.
// The commands are returned as a list of command labels / actions.
func (n *Namespace) ListCommands() []string {
	labels := []string{}

	for key := range n.Commands {
		labels = append(labels, key)
	}

	slices.Sort(labels)

	return labels
}