package cli

import (
	"fmt"
	"io"
)

type Handlers struct {
	PrintUsage func(io.Writer)
	RunServer  func([]string) error
	RunAPI     func([]string) error
}

func (h Handlers) printUsage(w io.Writer) {
	if h.PrintUsage != nil {
		h.PrintUsage(w)
	}
}

// Run executes the inbox CLI and returns a process exit code.
func Run(args []string, stderr io.Writer, handlers Handlers) int {
	if len(args) < 2 {
		handlers.printUsage(stderr)
		return 1
	}

	cmd := args[1]
	var err error

	switch cmd {
	case "server":
		if handlers.RunServer == nil {
			err = fmt.Errorf("cli %s handler is not configured", cmd)
			break
		}
		err = handlers.RunServer(args[2:])
	case "api":
		if handlers.RunAPI == nil {
			err = fmt.Errorf("cli %s handler is not configured", cmd)
			break
		}
		err = handlers.RunAPI(args[2:])
	default:
		handlers.printUsage(stderr)
		return 1
	}

	if err != nil {
		fmt.Fprintf(stderr, "error: %v\n", err)
		return 1
	}

	return 0
}