chore: auto-update Go modules

move lottery draw logic into runLottery()

move MarkFlagsMutuallyExclusive into init()

.goreleaser.yaml

@@ -17,6 +17,7 @@ before:
 
 builds:
   - main: ./cmd/lottery/
+    binary: lottery
     env:
       - CGO_ENABLED=0
     goos:

README.md

@@ -20,30 +20,64 @@ go install github.com/onyx-and-iris/lottery-cli/cmd/lottery@latest
 
 *flags*
 
+-   --kind/-k: The kind of lottery.
 -   --count/-c: Number of draws to generate.
 -   --count-prompt/-C: Prompt for the number of draws to generate.
-> Note. If both --count and --count-prompt are passed the count prompt will win.
+> Note. --count and --count-prompt flags are mutually exclusive.
 
 *environment variables*
 
 ```bash
 #!/usr/bin/env bash
 
+export LOTTERY_KIND=lotto
 export LOTTERY_COUNT=3
 export LOTTERY_COUNT_PROMPT=false
 ```
 
 ## Use
 
-There are no subcommands, just run the CLI directly passing any desired flags:
+### RootCmd
+
+Run with the selection prompt without prompting for a count:
 
 ```console
-lottery --count=3
+lottery
 ```
 
-You will then be entered into the selection prompt.
+Run with the selection prompt but also prompt for a count:
+
+```console
+lottery --count-prompt
+```
+
+Run with the selection prompt but pass in the count directly:
+
+```console
+lottery --count=4
+```
+
+Run a single draw directly:
+
+```console
+lottery --kind=euromillions 
+```
+
+Run multiple draws directly:
+
+```console
+lottery --kind=euromillions --count=3
+```
+
+### ListCmd
+
+List the available lotteries:
+
+```console
+lottery list
+```
 
 ## Special Thanks
 
--   [spf13](https://github.com/spf13) for the [cobra](https://github.com/spf13/cobra) package.
+-   [spf13](https://github.com/spf13) for the [cobra](https://github.com/spf13/cobra) and [viper](https://github.com/spf13/viper) packages.
 -   [Charm](https://github.com/charmbracelet) developers for the [fang](https://github.com/charmbracelet/fang), [lipgloss](https://github.com/charmbracelet/lipgloss) and [huh](https://github.com/charmbracelet/huh) packages.

cmd/lottery/list.go

@@ -0,0 +1,24 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+
+	"github.com/onyx-and-iris/lottery-cli"
+)
+
+// listCmd represents the list command.
+var listCmd = &cobra.Command{
+	Use:     "list",
+	Aliases: []string{"ls"},
+	Short:   "List all available lottery kinds.",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		fmt.Println(renderKindList(lottery.AllKinds()))
+		return nil
+	},
+}
+
+func init() {
+	rootCmd.AddCommand(listCmd)
+}

cmd/lottery/main.go

@@ -29,76 +29,125 @@ func versionFromBuild() string {
 	return strings.Split(info.Main.Version, "-")[0]
 }
 
-var cmd = &cobra.Command{
+var rootCmd = &cobra.Command{
 	Use:   "lottery",
 	Short: "A CLI for National Lottery games.",
+	PreRunE: func(cmd *cobra.Command, args []string) error {
+		// Fail fast if the count is invalid when the count-prompt flag is not set.
+		return validateNonPromptCount()
+	},
 	RunE: func(cmd *cobra.Command, args []string) error {
-		var selected string
+		kindStr := viper.GetString("kind")
-
+		if kindStr == "" {
-		form := huh.NewForm(
+			if err := huh.NewSelect[string]().
-			huh.NewGroup(
-				huh.NewSelect[string]().
 				Title("Pick a lottery.").
-					Options(
+				Options(kindPromptOptions()...).
-						huh.NewOption("Lotto", "lotto"),
+				Value(&kindStr).Run(); err != nil {
-						huh.NewOption("EuroMillions", "euromillions"),
+				return err
-						huh.NewOption("Set For Life", "setforlife"),
+			}
-						huh.NewOption("Thunderball", "thunderball"),
+		}
-						huh.NewOption("Powerball", "powerball"),
+
-					).
+		kind, err := lottery.ParseKind(kindStr)
-					Value(&selected),
-			),
-		)
-		err := form.Run()
 		if err != nil {
 			return err
 		}
 
-		kind, err := lottery.ParseKind(selected)
+		count, err := resolveCount()
 		if err != nil {
 			return err
 		}
 
-		l, err := lottery.New(kind)
+		return runLottery(kind, count)
-		if err != nil {
-			return err
-		}
-
-		if countPrompt := viper.GetBool("count-prompt"); countPrompt {
-			var count string
-			countPrompt := huh.NewForm(
-				huh.NewGroup(
-					huh.NewInput().
-						Title("How many draws would you like to generate?").
-						Value(&count),
-				),
-			)
-			err := countPrompt.Run()
-			if err != nil {
-				return err
-			}
-			viper.Set("count", count)
-		}
-
-		count := viper.GetInt("count")
-
-		for range count {
-			l.Draw()
-			fmt.Println(renderDraw(l))
-		}
-
-		return nil
 	},
 }
 
+// resolveCount resolves the count of draws to generate, either from the command line flag or by prompting the user.
+func resolveCount() (int, error) {
+	if viper.GetBool("count-prompt") {
+		var count int
+		if err := huh.NewInput().
+			Title("How many draws would you like to generate?").
+			Validate(func(s string) error {
+				parsedCount, err := parseCount(s)
+				if err != nil {
+					return err
+				}
+				count = parsedCount
+				return nil
+			}).
+			Run(); err != nil {
+			return 0, err
+		}
+
+		return count, nil
+	}
+
+	return viper.GetInt("count"), nil
+}
+
+// runLottery runs the lottery draw for the specified kind and count.
+func runLottery(kind lottery.Kind, count int) error {
+	selectedLottery, err := lottery.New(kind)
+	if err != nil {
+		return err
+	}
+
+	includeDrawHeading := count > 1
+	renders := make([]string, 0, count)
+	drawTitle := "Lottery"
+
+	for i := range count {
+		selectedLottery.Draw()
+		title, entry := renderDrawEntry(selectedLottery, i+1, includeDrawHeading)
+		drawTitle = title
+		renders = append(renders, entry)
+	}
+
+	if len(renders) > 0 {
+		fmt.Println(renderDrawCollection(drawTitle, renders))
+	}
+
+	return nil
+}
+
+// kindPromptLabel returns a user-friendly label for the given lottery kind.
+func kindPromptLabel(kind lottery.Kind) string {
+	switch kind {
+	case lottery.KindLotto:
+		return "Lotto"
+	case lottery.KindEuroMillions:
+		return "EuroMillions"
+	case lottery.KindSetForLife:
+		return "Set For Life"
+	case lottery.KindThunderball:
+		return "Thunderball"
+	case lottery.KindPowerball:
+		return "Powerball"
+	default:
+		return string(kind)
+	}
+}
+
+// kindPromptOptions returns a slice of options for the lottery kind prompt.
+func kindPromptOptions() []huh.Option[string] {
+	kinds := lottery.AllKinds()
+	options := make([]huh.Option[string], 0, len(kinds))
+	for _, kind := range kinds {
+		options = append(options, huh.NewOption(kindPromptLabel(kind), string(kind)))
+	}
+	return options
+}
+
 func init() {
-	cmd.Flags().IntP("count", "c", 1, "Number of draws to generate.")
+	rootCmd.Flags().StringP("kind", "k", "", "Lottery kind to generate draws for.")
-	cmd.Flags().BoolP("count-prompt", "C", false, "Prompt for the number of draws to generate.")
+	rootCmd.Flags().IntP("count", "c", 1, "Number of draws to generate.")
+	rootCmd.Flags().BoolP("count-prompt", "C", false, "Prompt for the number of draws to generate.")
+	rootCmd.MarkFlagsMutuallyExclusive("count", "count-prompt")
 
 	viper.SetEnvKeyReplacer(strings.NewReplacer("-", "_"))
 	viper.SetEnvPrefix("LOTTERY")
 	viper.AutomaticEnv()
-	if err := viper.BindPFlags(cmd.Flags()); err != nil {
+	if err := viper.BindPFlags(rootCmd.Flags()); err != nil {
 		panic(err)
 	}
 }
@@ -106,7 +155,7 @@ func init() {
 func main() {
 	if err := fang.Execute(
 		context.Background(),
-		cmd,
+		rootCmd,
 		fang.WithVersion(versionFromBuild()),
 	); err != nil {
 		os.Exit(1)

cmd/lottery/render.go

@@ -9,6 +9,24 @@ import (
 	"github.com/onyx-and-iris/lottery-cli"
 )
 
+// nolint:misspell
+var (
+	titleStyle       = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("12"))
+	drawHeadingStyle = lipgloss.NewStyle().
+				Bold(true).
+				Underline(true).
+				Foreground(lipgloss.Color("14"))
+	labelStyle     = lipgloss.NewStyle().Foreground(lipgloss.Color("8"))
+	numbersStyle   = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("10"))
+	specialStyle   = lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("11"))
+	separatorStyle = lipgloss.NewStyle().Foreground(lipgloss.Color("8"))
+	cardStyle      = lipgloss.NewStyle().
+			BorderStyle(lipgloss.RoundedBorder()).
+			BorderForeground(lipgloss.Color("8")).
+			Padding(0, 1).
+			MarginTop(1)
+)
+
 func formatNumberList(numbers []int) string {
 	parts := make([]string, len(numbers))
 	for i, n := range numbers {
@@ -17,13 +35,7 @@ func formatNumberList(numbers []int) string {
 	return strings.Join(parts, "  ")
 }
 
-// nolint:misspell
+func drawTitleAndLines(l lottery.Lottery) (string, []string) {
-func renderDraw(l lottery.Lottery) string {
-	titleStyle := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("12"))
-	labelStyle := lipgloss.NewStyle().Foreground(lipgloss.Color("8"))
-	numbersStyle := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("10"))
-	specialStyle := lipgloss.NewStyle().Bold(true).Foreground(lipgloss.Color("11"))
-
 	var title string
 	var lines []string
 
@@ -91,12 +103,72 @@ func renderDraw(l lottery.Lottery) string {
 		lines = append(lines, "Unknown lottery type")
 	}
 
-	body := strings.Join(lines, "\n")
+	return title, lines
-	card := lipgloss.NewStyle().
+}
-		BorderStyle(lipgloss.RoundedBorder()).
+
-		BorderForeground(lipgloss.Color("8")).
+func renderDrawEntry(l lottery.Lottery, drawNumber int, includeHeading bool) (string, string) {
-		Padding(0, 1).
+	title, lines := drawTitleAndLines(l)
-		MarginTop(1)
+
-
+	entry := make([]string, 0, len(lines)+1)
-	return card.Render(titleStyle.Render(title+" draw") + "\n" + body)
+	if includeHeading {
+		entry = append(entry, drawHeadingStyle.Render("Draw "+strconv.Itoa(drawNumber)))
+	}
+	entry = append(entry, lines...)
+
+	return title, strings.Join(entry, "\n")
+}
+
+func maxLineWidth(blocks []string) int {
+	maxWidth := 0
+	for _, block := range blocks {
+		for line := range strings.SplitSeq(block, "\n") {
+			width := lipgloss.Width(line)
+			if width > maxWidth {
+				maxWidth = width
+			}
+		}
+	}
+	if maxWidth < 12 {
+		return 12
+	}
+	return maxWidth
+}
+
+// renderDrawCollection renders a collection of draw entries into a single string with a title and separator lines.
+func renderDrawCollection(title string, entries []string) string {
+	if len(entries) == 0 {
+		return ""
+	}
+
+	separator := separatorStyle.Render(strings.Repeat("─", maxLineWidth(entries)))
+	body := strings.Join(entries, "\n"+separator+"\n")
+	if len(entries) == 1 {
+		title = titleStyle.Render(title + " draw")
+	} else {
+		title = titleStyle.Render(title + " draws")
+	}
+
+	return cardStyle.Render(title + "\n" + body)
+}
+
+// renderKindList renders a list of lottery kinds into a formatted string.
+func renderKindList(kinds []lottery.Kind) string {
+	lines := make([]string, 0, len(kinds)+1)
+	lines = append(
+		lines,
+		labelStyle.Render("Total:")+" "+numbersStyle.Render(strconv.Itoa(len(kinds))),
+	)
+
+	for _, kind := range kinds {
+		lines = append(
+			lines,
+			specialStyle.Render("•")+
+				" "+numbersStyle.Render(kindPromptLabel(kind))+
+				" "+labelStyle.Render("("+string(kind)+")"),
+		)
+	}
+
+	return cardStyle.Render(
+		titleStyle.Render("Available lottery kinds") + "\n" + strings.Join(lines, "\n"),
+	)
 }

cmd/lottery/validate.go

@@ -0,0 +1,41 @@
+package main
+
+import (
+	"fmt"
+	"strconv"
+	"strings"
+
+	"github.com/spf13/viper"
+)
+
+// validateNonPromptCount checks if the count is valid when the count-prompt flag is not set.
+func validateNonPromptCount() error {
+	if viper.GetBool("count-prompt") {
+		return nil
+	}
+
+	return validateCount(viper.GetInt("count"))
+}
+
+// validateCount checks if the count is valid.
+func validateCount(count int) error {
+	if count < 1 {
+		return fmt.Errorf("count must be greater than 0")
+	}
+
+	return nil
+}
+
+// parseCount parses the count from a string and validates it.
+func parseCount(raw string) (int, error) {
+	count, err := strconv.Atoi(strings.TrimSpace(raw))
+	if err != nil {
+		return 0, fmt.Errorf("count must be a whole number")
+	}
+
+	if err := validateCount(count); err != nil {
+		return 0, err
+	}
+
+	return count, nil
+}

go.mod

@@ -4,51 +4,50 @@ go 1.26.1
 
 require (
 	charm.land/huh/v2 v2.0.3
-	charm.land/lipgloss/v2 v2.0.5
+	charm.land/lipgloss/v2 v2.0.6
 	github.com/charmbracelet/fang v1.0.0
 	github.com/spf13/cobra v1.10.2
 	github.com/spf13/viper v1.21.0
 )
 
 require (
-	charm.land/bubbles/v2 v2.0.0 // indirect
+	charm.land/bubbles/v2 v2.1.1 // indirect
-	charm.land/bubbletea/v2 v2.0.2 // indirect
+	charm.land/bubbletea/v2 v2.0.8 // indirect
 	github.com/atotto/clipboard v0.1.4 // indirect
-	github.com/catppuccin/go v0.2.0 // indirect
+	github.com/catppuccin/go v0.3.0 // indirect
 	github.com/charmbracelet/colorprofile v0.4.3 // indirect
-	github.com/charmbracelet/ultraviolet v0.0.0-20260205113103-524a6607adb8 // indirect
+	github.com/charmbracelet/ultraviolet v0.0.0-20260812204455-68fa937c71be // indirect
-	github.com/charmbracelet/x/ansi v0.11.7 // indirect
+	github.com/charmbracelet/x/ansi v0.11.8 // indirect
-	github.com/charmbracelet/x/exp/charmtone v0.0.0-20250603201427-c31516f43444 // indirect
+	github.com/charmbracelet/x/exp/charmtone v0.0.0-20260816001655-68d539dca504 // indirect
 	github.com/charmbracelet/x/exp/ordered v0.1.0 // indirect
-	github.com/charmbracelet/x/exp/strings v0.0.0-20240722160745-212f7b056ed0 // indirect
+	github.com/charmbracelet/x/exp/strings v0.1.0 // indirect
 	github.com/charmbracelet/x/term v0.2.2 // indirect
 	github.com/charmbracelet/x/termios v0.1.1 // indirect
 	github.com/charmbracelet/x/windows v0.2.2 // indirect
 	github.com/clipperhouse/displaywidth v0.11.0 // indirect
 	github.com/clipperhouse/uax29/v2 v2.7.0 // indirect
 	github.com/dustin/go-humanize v1.0.1 // indirect
-	github.com/fsnotify/fsnotify v1.9.0 // indirect
+	github.com/fsnotify/fsnotify v1.10.1 // indirect
-	github.com/go-viper/mapstructure/v2 v2.4.0 // indirect
+	github.com/go-viper/mapstructure/v2 v2.5.0 // indirect
 	github.com/inconshreveable/mousetrap v1.1.0 // indirect
-	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.4.1 // indirect
-	github.com/mattn/go-runewidth v0.0.23 // indirect
+	github.com/mattn/go-runewidth v0.0.27 // indirect
 	github.com/mitchellh/hashstructure/v2 v2.0.2 // indirect
 	github.com/muesli/cancelreader v0.2.2 // indirect
-	github.com/muesli/mango v0.1.0 // indirect
+	github.com/muesli/mango v0.2.0 // indirect
-	github.com/muesli/mango-cobra v1.2.0 // indirect
+	github.com/muesli/mango-cobra v1.3.0 // indirect
-	github.com/muesli/mango-pflag v0.1.0 // indirect
+	github.com/muesli/mango-pflag v0.2.0 // indirect
 	github.com/muesli/roff v0.1.0 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.4 // indirect
+	github.com/pelletier/go-toml/v2 v2.4.3 // indirect
 	github.com/rivo/uniseg v0.4.7 // indirect
-	github.com/sagikazarmark/locafero v0.11.0 // indirect
+	github.com/sagikazarmark/locafero v0.12.0 // indirect
-	github.com/sourcegraph/conc v0.3.1-0.20240121214520-5f936abd7ae8 // indirect
 	github.com/spf13/afero v1.15.0 // indirect
 	github.com/spf13/cast v1.10.0 // indirect
 	github.com/spf13/pflag v1.0.10 // indirect
 	github.com/subosito/gotenv v1.6.0 // indirect
-	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	github.com/xo/terminfo v1.0.0 // indirect
-	go.yaml.in/yaml/v3 v3.0.4 // indirect
+	go.yaml.in/yaml/v3 v3.0.5 // indirect
-	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sync v0.22.0 // indirect
-	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/sys v0.47.0 // indirect
-	golang.org/x/text v0.28.0 // indirect
+	golang.org/x/text v0.41.0 // indirect
 )

go.sum

@@ -1,39 +1,39 @@
-charm.land/bubbles/v2 v2.0.0 h1:tE3eK/pHjmtrDiRdoC9uGNLgpopOd8fjhEe31B/ai5s=
+charm.land/bubbles/v2 v2.1.1 h1:7r55WzBxpo/R3z98hGmY7KKPd3ET6vsf0Fb9sDHOV60=
-charm.land/bubbles/v2 v2.0.0/go.mod h1:rCHoleP2XhU8um45NTuOWBPNVHxnkXKTiZqcclL/qOI=
+charm.land/bubbles/v2 v2.1.1/go.mod h1:GE6M31gaWZVXzGw73OeuTTgy4lX+OtkH0E5ymnNsHxo=
-charm.land/bubbletea/v2 v2.0.2 h1:4CRtRnuZOdFDTWSff9r8QFt/9+z6Emubz3aDMnf/dx0=
+charm.land/bubbletea/v2 v2.0.8 h1:SxTJMhCAI3lbPmy4SgX5LWZ24AdINr4I6UEqzZvYJuY=
-charm.land/bubbletea/v2 v2.0.2/go.mod h1:3LRff2U4WIYXy7MTxfbAQ+AdfM3D8Xuvz2wbsOD9OHQ=
+charm.land/bubbletea/v2 v2.0.8/go.mod h1:2SkdgoTXluXJHOUwAoRlRXF/28vklb1rFl6GcgV1/ss=
 charm.land/huh/v2 v2.0.3 h1:2cJsMqEPwSywGHvdlKsJyQKPtSJLVnFKyFbsYZTlLkU=
 charm.land/huh/v2 v2.0.3/go.mod h1:93eEveeeqn47MwiC3tf+2atZ2l7Is88rAtmZNZ8x9Wc=
-charm.land/lipgloss/v2 v2.0.5 h1:kbNxgeeUOYv5J0YdpxFjfvf3dFvqH8Aci4zB6xqFtrY=
+charm.land/lipgloss/v2 v2.0.6 h1:EaGKeuA8FvF+v2BT5VmZd2LoYLaMZJXA5n34th8nCIQ=
-charm.land/lipgloss/v2 v2.0.5/go.mod h1:9oqhxt4yxIMe6q5A4kHr44DremZk7J9UNh74GlWa5nc=
+charm.land/lipgloss/v2 v2.0.6/go.mod h1:ipDDJNSGa1hlwDtSfW1s2/xR8Vdhbut4PXh2zEKZd0Q=
 github.com/MakeNowJust/heredoc v1.0.0 h1:cXCdzVdstXyiTqTvfqk9SDHpKNjxuom+DOlyEeQ4pzQ=
 github.com/MakeNowJust/heredoc v1.0.0/go.mod h1:mG5amYoWBHf8vpLOuehzbGGw0EHxpZZ6lCpQ4fNJ8LE=
 github.com/atotto/clipboard v0.1.4 h1:EH0zSVneZPSuFR11BlR9YppQTVDbh5+16AmcJi4g1z4=
 github.com/atotto/clipboard v0.1.4/go.mod h1:ZY9tmq7sm5xIbd9bOK4onWV4S6X0u6GY7Vn0Yu86PYI=
 github.com/aymanbagabas/go-udiff v0.4.1 h1:OEIrQ8maEeDBXQDoGCbbTTXYJMYRCRO1fnodZ12Gv5o=
 github.com/aymanbagabas/go-udiff v0.4.1/go.mod h1:0L9PGwj20lrtmEMeyw4WKJ/TMyDtvAoK9bf2u/mNo3w=
-github.com/catppuccin/go v0.2.0 h1:ktBeIrIP42b/8FGiScP9sgrWOss3lw0Z5SktRoithGA=
+github.com/catppuccin/go v0.3.0 h1:d+0/YicIq+hSTo5oPuRi5kOpqkVA5tAsU6dNhvRu+aY=
-github.com/catppuccin/go v0.2.0/go.mod h1:8IHJuMGaUUjQM82qBrGNBv7LFq6JI3NnQCF6MOlZjpc=
+github.com/catppuccin/go v0.3.0/go.mod h1:8IHJuMGaUUjQM82qBrGNBv7LFq6JI3NnQCF6MOlZjpc=
 github.com/charmbracelet/colorprofile v0.4.3 h1:QPa1IWkYI+AOB+fE+mg/5/4HRMZcaXex9t5KX76i20Q=
 github.com/charmbracelet/colorprofile v0.4.3/go.mod h1:/zT4BhpD5aGFpqQQqw7a+VtHCzu+zrQtt1zhMt9mR4Q=
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@@ -55,10 +55,10 @@ github.com/dustin/go-humanize v1.0.1 h1:GzkhY7T5VNhEkwH0PVJgjz+fX1rhBrR7pRT3mDkp
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-github.com/fsnotify/fsnotify v1.9.0 h1:2Ml+OJNzbYCTzsxtv8vKSFD9PbJjmhYF14k/jKC7S9k=
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@@ -67,24 +67,24 @@ github.com/kr/pretty v0.3.1 h1:flRD4NNwYAUpkphVc1HcthR4KEIFJ65n8Mw5qdRn3LE=
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@@ -92,10 +92,8 @@ github.com/rivo/uniseg v0.4.7/go.mod h1:FN3SvrM+Zdj16jyLfmOkMNblXMcoc8DfTHruCPUc
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@@ -111,20 +109,19 @@ github.com/stretchr/testify v1.11.1 h1:7s2iGBzp5EwR7/aIZr8ao5+dra3wiQyKjjFuvgVKu
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kinds.go

@@ -1,6 +1,10 @@
 package lottery
 
-import "fmt"
+import (
+	"fmt"
+	"slices"
+	"strings"
+)
 
 type Kind string
 
@@ -12,19 +16,43 @@ const (
 	KindPowerball    Kind = "powerball"
 )
 
+var allKinds = []Kind{
+	KindLotto,
+	KindEuroMillions,
+	KindSetForLife,
+	KindThunderball,
+	KindPowerball,
+}
+
+var allKindsText = []string{
+	string(KindLotto),
+	string(KindEuroMillions),
+	string(KindSetForLife),
+	string(KindThunderball),
+	string(KindPowerball),
+}
+
+var allKindsCSV = strings.Join(allKindsText, ", ")
+
+// AllKinds returns the complete, ordered list of supported lottery kinds.
+//
+// The returned slice is a copy and can be modified safely by callers.
+func AllKinds() []Kind {
+	kinds := make([]Kind, len(allKinds))
+	copy(kinds, allKinds)
+	return kinds
+}
+
+// ParseKind parses a string into a Kind, returning an error if the string is not a valid kind.
 func ParseKind(kind string) (Kind, error) {
-	switch kind {
+	parsed := Kind(kind)
-	case "lotto":
+	if slices.Contains(allKinds, parsed) {
-		return KindLotto, nil
+		return parsed, nil
-	case "euromillions":
-		return KindEuroMillions, nil
-	case "setforlife":
-		return KindSetForLife, nil
-	case "thunderball":
-		return KindThunderball, nil
-	case "powerball":
-		return KindPowerball, nil
-	default:
-		return "", fmt.Errorf("invalid lottery kind: %s", kind)
 	}
+
+	return "", fmt.Errorf(
+		"invalid lottery kind: %s, must be one of: %s",
+		kind,
+		allKindsCSV,
+	)
 }

kinds_test.go

@@ -0,0 +1,71 @@
+package lottery
+
+import (
+	"strings"
+	"testing"
+)
+
+func TestAllKindsReturnsExpectedOrder(t *testing.T) {
+	t.Parallel()
+
+	got := AllKinds()
+	want := []Kind{
+		KindLotto,
+		KindEuroMillions,
+		KindSetForLife,
+		KindThunderball,
+		KindPowerball,
+	}
+
+	if len(got) != len(want) {
+		t.Fatalf("expected %d kinds, got %d", len(want), len(got))
+	}
+
+	for i := range want {
+		if got[i] != want[i] {
+			t.Fatalf("kind at index %d: expected %q, got %q", i, want[i], got[i])
+		}
+	}
+}
+
+func TestAllKindsReturnsCopy(t *testing.T) {
+	t.Parallel()
+
+	first := AllKinds()
+	first[0] = "mutated"
+
+	again := AllKinds()
+	if again[0] != KindLotto {
+		t.Fatalf("expected AllKinds to return a defensive copy")
+	}
+}
+
+func TestParseKindAcceptsAllKinds(t *testing.T) {
+	t.Parallel()
+
+	for _, kind := range AllKinds() {
+		parsed, err := ParseKind(string(kind))
+		if err != nil {
+			t.Fatalf("expected no error for %q, got %v", kind, err)
+		}
+		if parsed != kind {
+			t.Fatalf("expected %q, got %q", kind, parsed)
+		}
+	}
+}
+
+func TestParseKindIncludesAllKindsInError(t *testing.T) {
+	t.Parallel()
+
+	_, err := ParseKind("invalid")
+	if err == nil {
+		t.Fatalf("expected an error for invalid kind")
+	}
+
+	message := err.Error()
+	for _, kind := range AllKinds() {
+		if !strings.Contains(message, string(kind)) {
+			t.Fatalf("expected error message to contain kind %q: %s", kind, message)
+		}
+	}
+}

util.go

@@ -8,8 +8,8 @@ import (
 // drawUnique returns count unique numbers in the range [1, max].
 // It uses the rand.Perm function to generate a random permutation of numbers and selects the first count numbers from it.
 // The result is sorted before being returned.
-func drawUnique(count, max int) []int {
+func drawUnique(count, maxNum int) []int {
-	perm := rand.Perm(max)
+	perm := rand.Perm(maxNum)
 	result := make([]int, count)
 	for i := range result {
 		result[i] = perm[i] + 1

util_test.go

@@ -0,0 +1,40 @@
+package lottery
+
+import "testing"
+
+func TestDrawUnique(t *testing.T) {
+	for _, tc := range []struct {
+		name   string
+		count  int
+		maxNum int
+	}{
+		{"small", 3, 10},
+		{"exact", 5, 5},
+		{"larger", 10, 50},
+	} {
+		t.Run(tc.name, func(t *testing.T) {
+			for range 100 {
+				nums := drawUnique(tc.count, tc.maxNum)
+				if len(nums) != tc.count {
+					t.Fatalf("got len=%d, want %d", len(nums), tc.count)
+				}
+
+				seen := make(map[int]struct{}, len(nums))
+				prev := 0
+				for _, n := range nums {
+					if n < 1 || n > tc.maxNum {
+						t.Fatalf("value %d out of range [1,%d]", n, tc.maxNum)
+					}
+					if n < prev {
+						t.Fatalf("values not sorted: %v", nums)
+					}
+					if _, ok := seen[n]; ok {
+						t.Fatalf("duplicate value %d in %v", n, nums)
+					}
+					prev = n
+					seen[n] = struct{}{}
+				}
+			}
+		})
+	}
+}