package uuid

import (
	"fmt"
	"os"
	"reflect"
)



func showColour() bool {
	return os.Getenv("NO_COLOUR") == ""
}

func testing(message string, body func()) {
	if showColour() {
		fmt.Fprintf(
			os.Stderr,
			"\033[0;33mtesting\033[0m: %s... ",
			message,
		)
		body()
		fmt.Fprintf(os.Stderr, "\033[0;32mOK\033[0m.\n")
	} else {
		fmt.Fprintf(os.Stderr, "testing: %s... ", message)
		body()
		fmt.Fprintf(os.Stderr, "OK.\n")
	}
}

func assertEq(given any, expected any) {
	if !reflect.DeepEqual(given, expected) {
		if showColour() {
			fmt.Fprintf(os.Stderr, "\033[0;31mERR\033[0m.\n")
		} else {
			fmt.Fprintf(os.Stderr, "ERR.\n")
		}
		fmt.Fprintf(os.Stderr, "given != expected\n")
		fmt.Fprintf(os.Stderr, "given:    %#v\n", given)
		fmt.Fprintf(os.Stderr, "expected: %#v\n", expected)
		os.Exit(1)
	}
}



func MainTest() {
	testing("string is the same after round-trip", func() {
		str1 := New().String()
		id, err := FromString(str1)
		assertEq(err, nil)
		str2 := id.String()
		assertEq(str1, str2)
	})

	testing("UUID is the same after round-trip", func() {
		id1 := New()
		id2, err := FromString(id1.String())
		assertEq(err, nil)
		assertEq(id1, id2)
	})
}