initial commit

.github/workflows/golang-ci.yml

@@ -0,0 +1,30 @@
+name: CI
+
+on:
+  push:
+    branches: ['main']
+    paths:
+      - '**.go'
+  pull_request:
+    branches: ['main']
+    paths:
+      - '**.go'
+jobs:
+  lint:
+    name: Lint
+    runs-on: ubuntu-latest
+    if: github.event_name == 'pull_request'
+    timeout-minutes: 3
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 1
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: '1.24'
+      - name: golangci-lint
+        uses: golangci/golangci-lint-action@v9
+        with:
+          version: v2.6.0
+          args: --config .golangci.yml

.github/workflows/release.yml

@@ -0,0 +1,28 @@
+name: goreleaser
+
+on:
+  push:
+    tags:
+      - 'v*' # Push events to matching v*, i.e. v1.0, v20.15.10
+
+permissions:
+  contents: write
+
+jobs:
+  goreleaser:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Set up Go
+        uses: actions/setup-go@v5
+      - name: Run GoReleaser
+        uses: goreleaser/goreleaser-action@v6
+        with:
+          distribution: goreleaser
+          version: '~> v2'
+          args: release --clean
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}

.github/workflows/update-go-modules.yml

@@ -0,0 +1,30 @@
+name: Auto-Update Go Modules
+
+on:
+  schedule:
+    - cron: '0 0 * * 1' # Runs every Monday at midnight
+
+jobs:
+  update-go-modules:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+
+    steps:
+      - name: Checkout Code
+        uses: actions/checkout@v4
+
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: stable
+
+      - name: Update Dependencies
+        run: |
+          go get -u ./...
+          go mod tidy
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add go.mod go.sum
+          git commit -m "chore: auto-update Go modules"
+          git push

.gitignore

@@ -0,0 +1,37 @@
+# Generated by ignr: github.com/onyx-and-iris/ignr
+
+## Go ##
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
+# Binaries for programs and plugins
+*.exe
+*.exe~
+*.dll
+*.so
+*.dylib
+
+# Test binary, built with `go test -c`
+*.test
+
+# Code coverage profiles and other test artifacts
+*.out
+coverage.*
+*.coverprofile
+profile.cov
+
+# Dependency directories (remove the comment below to include it)
+# vendor/
+
+# Go workspace file
+go.work
+go.work.sum
+
+# env file
+.env
+
+# Editor/IDE
+# .idea/
+# .vscode/
+
+# End of ignr

.golangci.yml

@@ -0,0 +1,142 @@
+version: '2'
+
+run:
+  timeout: 3m
+  tests: true
+  go: '1.24'
+
+linters:
+  disable: []
+  enable:
+    # Default enabled linters
+    - errcheck # Check for unchecked errors
+    - govet # Go's built-in vetting tool
+    - ineffassign # Detect ineffectual assignments
+    - staticcheck # Advanced static analysis
+    - unused # Check for unused code
+    # Additional useful linters
+    - misspell # Detect common misspellings
+    - unparam # Check for unused function parameters
+    - gosec # Security checks
+    - asciicheck # Check for non-ASCII characters
+    - errname # Check error variable names
+    - godot # Check for missing periods in comments
+    - revive # Highly configurable linter for style and correctness
+    - gocritic # Detect code issues and suggest improvements
+    - gocyclo # Check for cyclomatic complexity
+    - dupl # Check for code duplication
+    - predeclared # Check for shadowing of predeclared identifiers
+    - copyloopvar # Check for loop variable capture in goroutines
+    - errorlint # Check for common mistakes in error handling
+    - goconst # Check for repeated strings that could be constants
+    - gosmopolitan # Check for non-portable code
+
+  settings:
+    misspell:
+      locale: UK
+
+    errcheck:
+      check-type-assertions: true
+      check-blank: true
+      exclude-functions:
+        - fmt.Fprintf
+        - fmt.Fprintln
+        - fmt.Printf
+        - fmt.Println
+        - fmt.Errorf
+
+    revive:
+      severity: warning
+      rules:
+        # Code quality and style
+        - name: exported
+          arguments:
+            - 'checkPrivateReceivers'
+            - 'sayRepetitiveInsteadOfStutters'
+        - name: var-naming
+        - name: package-comments
+        - name: range-val-in-closure
+        - name: time-naming
+        - name: context-as-argument
+        - name: context-keys-type
+        - name: dot-imports
+        - name: empty-block
+        - name: error-return
+        - name: error-strings
+        - name: error-naming
+        - name: if-return
+        - name: increment-decrement
+        - name: indent-error-flow
+        - name: receiver-naming
+        - name: redefines-builtin-id
+        - name: superfluous-else
+        - name: unexported-return
+        - name: unreachable-code
+        - name: unused-parameter
+        - name: var-declaration
+        - name: blank-imports
+        - name: range
+
+        # Disabled rules (can be enabled if needed)
+        # - name: line-length-limit
+        #   arguments: [120]
+        # - name: function-length
+        #   arguments: [50, 0]
+        # - name: cyclomatic
+        #   arguments: [10]
+
+    gosec:
+      excludes:
+        - G104 # Duplicated errcheck checks
+        - G115 # integer overflow conversion int -> uint32
+
+  exclusions:
+    warn-unused: false
+    rules:
+      # Exclude some linters from running on tests files.
+      - path: _test\.go
+        linters:
+          - gocyclo
+          - errcheck
+          - dupl
+          - gosec
+
+    paths:
+      - vendor
+
+# Formatters configuration
+formatters:
+  # Enable specific formatters
+  enable:
+    - gofumpt # Stricter gofmt alternative
+    - goimports # Organizes imports
+    - gci # Controls import order/grouping
+    - golines # Enforces line length
+
+  # Formatter-specific settings
+  settings:
+    goimports:
+      local-prefixes: [github.com/onyx-and-iris/lottery-cli]
+
+    gci:
+      # Define import sections order
+      sections:
+        - standard # Standard library
+        - default # Everything else
+        - prefix(github.com/onyx-and-iris/lottery-cli) # Current module
+
+    gofumpt:
+      extra-rules: true # Enable additional formatting rules
+
+  exclusions:
+    warn-unused: true
+
+    paths:
+      - vendor
+
+issues:
+  # Limit the number of same issues reported to avoid spam
+  max-same-issues: 50
+
+  # Limit the number of issues per linter to keep output manageable
+  max-issues-per-linter: 100

.goreleaser.yaml

@@ -0,0 +1,55 @@
+# This is an example .goreleaser.yml file with some sensible defaults.
+# Make sure to check the documentation at https://goreleaser.com
+
+# The lines below are called `modelines`. See `:help modeline`
+# Feel free to remove those if you don't want/need to use them.
+# yaml-language-server: $schema=https://goreleaser.com/static/schema.json
+# vim: set ts=2 sw=2 tw=0 fo=cnqoj
+
+version: 2
+
+before:
+  hooks:
+    # You may remove this if you don't use go modules.
+    - go mod tidy
+    # you may remove this if you don't need go generate
+    - go generate ./...
+
+builds:
+  - main: ./cmd/lottery/
+    env:
+      - CGO_ENABLED=0
+    goos:
+      - linux
+      - windows
+      - darwin
+
+archives:
+  - formats: ['tar.gz']
+    # this name template makes the OS and Arch compatible with the results of `uname`.
+    name_template: >-
+      {{ .ProjectName }}_
+      {{- title .Os }}_
+      {{- if eq .Arch "amd64" }}x86_64
+      {{- else if eq .Arch "386" }}i386
+      {{- else }}{{ .Arch }}{{ end }}
+      {{- if .Arm }}v{{ .Arm }}{{ end }}
+    # use zip for windows archives
+    format_overrides:
+      - goos: windows
+        formats: ['zip']
+
+changelog:
+  sort: asc
+  filters:
+    exclude:
+      - '^docs:'
+      - '^test:'
+      - '^chore:'
+
+release:
+  footer: >-
+
+    ---
+
+    Released by [GoReleaser](https://github.com/goreleaser/goreleaser).

.pre-commit-config.yaml

@@ -0,0 +1,5 @@
+repos:
+  - repo: https://github.com/tekwizely/pre-commit-golang
+    rev: v1.0.0-rc.4
+    hooks:
+      - id: go-mod-tidy

cmd/lottery/main.go

@@ -0,0 +1,75 @@
+package main
+
+import (
+	"context"
+	"fmt"
+	"os"
+	"runtime/debug"
+	"strings"
+
+	"charm.land/huh/v2"
+	"github.com/charmbracelet/fang"
+	"github.com/onyx-and-iris/lottery-cli"
+	"github.com/spf13/cobra"
+)
+
+var version string
+
+func versionFromBuild() string {
+	if version != "" {
+		return version
+	}
+
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		return "(unable to read version)"
+	}
+	return strings.Split(info.Main.Version, "-")[0]
+}
+
+var cmd = &cobra.Command{
+	Use:   "lottery",
+	Short: "A CLI for National Lottery games.",
+	RunE: func(cmd *cobra.Command, args []string) error {
+		var selected string
+
+		form := huh.NewForm(
+			huh.NewGroup(
+				huh.NewSelect[string]().
+					Title("Pick a lottery.").
+					Options(
+						huh.NewOption("Lotto", "lotto"),
+						huh.NewOption("EuroMillions", "euromillions"),
+						huh.NewOption("SetForLife", "setforlife"),
+						huh.NewOption("Thunderball", "thunderball"),
+						huh.NewOption("Powerball", "powerball"),
+					).
+					Value(&selected),
+			),
+		)
+		err := form.Run()
+		if err != nil {
+			return err
+		}
+
+		kind, err := lottery.ParseKind(selected)
+		if err != nil {
+			return err
+		}
+
+		l, err := lottery.New(kind)
+		if err != nil {
+			return err
+		}
+		l.Draw()
+		fmt.Println(renderDraw(l))
+
+		return nil
+	},
+}
+
+func main() {
+	if err := fang.Execute(context.Background(), cmd, fang.WithVersion(versionFromBuild())); err != nil {
+		os.Exit(1)
+	}
+}

cmd/lottery/render.go

@@ -0,0 +1,61 @@
+package main
+
+import (
+	"strconv"
+	"strings"
+
+	"charm.land/lipgloss/v2"
+	"github.com/onyx-and-iris/lottery-cli"
+)
+
+func formatNumberList(numbers []int) string {
+	parts := make([]string, len(numbers))
+	for i, n := range numbers {
+		parts[i] = strconv.Itoa(n)
+	}
+	return strings.Join(parts, "  ")
+}
+
+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
+
+	switch game := l.(type) {
+	case *lottery.Lotto:
+		title = "Lotto"
+		lines = append(lines, labelStyle.Render("Numbers:")+" "+numbersStyle.Render(formatNumberList(game.Numbers[:])))
+	case *lottery.EuroMillions:
+		title = "EuroMillions"
+		lines = append(lines, labelStyle.Render("Main:")+" "+numbersStyle.Render(formatNumberList(game.Numbers[:])))
+		lines = append(lines, labelStyle.Render("Lucky Stars:")+" "+specialStyle.Render(formatNumberList(game.LuckyStars[:])))
+	case *lottery.SetForLife:
+		title = "Set For Life"
+		lines = append(lines, labelStyle.Render("Main:")+" "+numbersStyle.Render(formatNumberList(game.Numbers[:])))
+		lines = append(lines, labelStyle.Render("Life Ball:")+" "+specialStyle.Render(strconv.Itoa(game.LifeBall)))
+	case *lottery.Thunderball:
+		title = "Thunderball"
+		lines = append(lines, labelStyle.Render("Main:")+" "+numbersStyle.Render(formatNumberList(game.Numbers[:])))
+		lines = append(lines, labelStyle.Render("Thunderball:")+" "+specialStyle.Render(strconv.Itoa(game.Thunderball)))
+	case *lottery.Powerball:
+		title = "Powerball"
+		lines = append(lines, labelStyle.Render("Main:")+" "+numbersStyle.Render(formatNumberList(game.Numbers[:])))
+		lines = append(lines, labelStyle.Render("Powerball:")+" "+specialStyle.Render(strconv.Itoa(game.Powerball)))
+	default:
+		title = "Lottery"
+		lines = append(lines, "Unknown lottery type")
+	}
+
+	body := strings.Join(lines, "\n")
+	card := lipgloss.NewStyle().
+		BorderStyle(lipgloss.RoundedBorder()).
+		BorderForeground(lipgloss.Color("8")).
+		Padding(0, 1).
+		MarginTop(1)
+
+	return card.Render(titleStyle.Render(title+" draw") + "\n" + body)
+}

go.mod

@@ -0,0 +1,44 @@
+module github.com/onyx-and-iris/lottery-cli
+
+go 1.26.1
+
+require (
+	charm.land/huh/v2 v2.0.3
+	charm.land/lipgloss/v2 v2.0.5
+	github.com/charmbracelet/fang v1.0.0
+	github.com/spf13/cobra v1.10.2
+)
+
+require (
+	charm.land/bubbles/v2 v2.0.0 // indirect
+	charm.land/bubbletea/v2 v2.0.2 // indirect
+	github.com/atotto/clipboard v0.1.4 // indirect
+	github.com/catppuccin/go v0.2.0 // indirect
+	github.com/charmbracelet/colorprofile v0.4.3 // indirect
+	github.com/charmbracelet/ultraviolet v0.0.0-20260205113103-524a6607adb8 // indirect
+	github.com/charmbracelet/x/ansi v0.11.7 // indirect
+	github.com/charmbracelet/x/exp/charmtone v0.0.0-20250603201427-c31516f43444 // 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/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/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/lucasb-eyer/go-colorful v1.4.0 // indirect
+	github.com/mattn/go-runewidth v0.0.23 // 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-cobra v1.2.0 // indirect
+	github.com/muesli/mango-pflag v0.1.0 // indirect
+	github.com/muesli/roff v0.1.0 // indirect
+	github.com/rivo/uniseg v0.4.7 // indirect
+	github.com/spf13/pflag v1.0.9 // indirect
+	github.com/xo/terminfo v0.0.0-20220910002029-abceb7e1c41e // indirect
+	golang.org/x/sync v0.19.0 // indirect
+	golang.org/x/sys v0.46.0 // indirect
+	golang.org/x/text v0.24.0 // indirect
+)

go.sum

@@ -0,0 +1,98 @@
+charm.land/bubbles/v2 v2.0.0 h1:tE3eK/pHjmtrDiRdoC9uGNLgpopOd8fjhEe31B/ai5s=
+charm.land/bubbles/v2 v2.0.0/go.mod h1:rCHoleP2XhU8um45NTuOWBPNVHxnkXKTiZqcclL/qOI=
+charm.land/bubbletea/v2 v2.0.2 h1:4CRtRnuZOdFDTWSff9r8QFt/9+z6Emubz3aDMnf/dx0=
+charm.land/bubbletea/v2 v2.0.2/go.mod h1:3LRff2U4WIYXy7MTxfbAQ+AdfM3D8Xuvz2wbsOD9OHQ=
+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 v2.0.5/go.mod h1:9oqhxt4yxIMe6q5A4kHr44DremZk7J9UNh74GlWa5nc=
+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 v0.2.0/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=
+github.com/charmbracelet/fang v1.0.0 h1:jESBY40agJOlLYnnv9jE0mLqDGTxEk0hkOnx7YGyRlQ=
+github.com/charmbracelet/fang v1.0.0/go.mod h1:P5/DNb9DddQ0Z0dbc0P3ol4/ix5Po7Ofr2KMBfAqoCo=
+github.com/charmbracelet/ultraviolet v0.0.0-20260205113103-524a6607adb8 h1:eyFRbAmexyt43hVfeyBofiGSEmJ7krjLOYt/9CF5NKA=
+github.com/charmbracelet/ultraviolet v0.0.0-20260205113103-524a6607adb8/go.mod h1:SQpCTRNBtzJkwku5ye4S3HEuthAlGy2n9VXZnWkEW98=
+github.com/charmbracelet/x/ansi v0.11.7 h1:kzv1kJvjg2S3r9KHo8hDdHFQLEqn4RBCb39dAYC84jI=
+github.com/charmbracelet/x/ansi v0.11.7/go.mod h1:9qGpnAVYz+8ACONkZBUWPtL7lulP9No6p1epAihUZwQ=
+github.com/charmbracelet/x/conpty v0.1.1 h1:s1bUxjoi7EpqiXysVtC+a8RrvPPNcNvAjfi4jxsAuEs=
+github.com/charmbracelet/x/conpty v0.1.1/go.mod h1:OmtR77VODEFbiTzGE9G1XiRJAga6011PIm4u5fTNZpk=
+github.com/charmbracelet/x/errors v0.0.0-20240508181413-e8d8b6e2de86 h1:JSt3B+U9iqk37QUU2Rvb6DSBYRLtWqFqfxf8l5hOZUA=
+github.com/charmbracelet/x/errors v0.0.0-20240508181413-e8d8b6e2de86/go.mod h1:2P0UgXMEa6TsToMSuFqKFQR+fZTO9CNGUNokkPatT/0=
+github.com/charmbracelet/x/exp/charmtone v0.0.0-20250603201427-c31516f43444 h1:IJDiTgVE56gkAGfq0lBEloWgkXMk4hl/bmuPoicI4R0=
+github.com/charmbracelet/x/exp/charmtone v0.0.0-20250603201427-c31516f43444/go.mod h1:T9jr8CzFpjhFVHjNjKwbAD7KwBNyFnj2pntAO7F2zw0=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250806222409-83e3a29d542f h1:pk6gmGpCE7F3FcjaOEKYriCvpmIN4+6OS/RD0vm4uIA=
+github.com/charmbracelet/x/exp/golden v0.0.0-20250806222409-83e3a29d542f/go.mod h1:IfZAMTHB6XkZSeXUqriemErjAWCCzT0LwjKFYCZyw0I=
+github.com/charmbracelet/x/exp/ordered v0.1.0 h1:55/qLwjIh0gL0Vni+QAWk7T/qRVP6sBf+2agPBgnOFE=
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kinds.go

@@ -0,0 +1,30 @@
+package lottery
+
+import "fmt"
+
+type Kind string
+
+const (
+	KindLotto        Kind = "lotto"
+	KindEuroMillions Kind = "euromillions"
+	KindSetForLife   Kind = "setforlife"
+	KindThunderball  Kind = "thunderball"
+	KindPowerball    Kind = "powerball"
+)
+
+func ParseKind(kind string) (Kind, error) {
+	switch kind {
+	case "lotto":
+		return KindLotto, 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)
+	}
+}

lottery.go

@@ -0,0 +1,111 @@
+package lottery
+
+import (
+	"fmt"
+	"math/rand"
+)
+
+// Lottery is an interface that defines the methods that all lottery games must implement.
+type Lottery interface {
+	Draw()
+}
+
+// Lotto represents the Lotto lottery game.
+// It draws 6 numbers from a pool of 1 to 59 without replacement.
+// There is no bonus ball in this game.
+type Lotto struct {
+	Numbers [6]int
+}
+
+func (l *Lotto) Draw() {
+	numbers := drawUnique(len(l.Numbers), 59)
+	for i := range l.Numbers {
+		l.Numbers[i] = numbers[i]
+	}
+}
+
+// EuroMillions represents the EuroMillions lottery game.
+// It draws 5 numbers from a pool of 1 to 50 without replacement.
+// Additionally, it draws 2 Lucky Stars from a pool of 1 to 12 without replacement.
+type EuroMillions struct {
+	Numbers    [5]int
+	LuckyStars [2]int
+}
+
+func (e *EuroMillions) Draw() {
+	numbers := drawUnique(len(e.Numbers), 50)
+	for i := range e.Numbers {
+		e.Numbers[i] = numbers[i]
+	}
+
+	luckyStars := drawUnique(len(e.LuckyStars), 12)
+	for i := range e.LuckyStars {
+		e.LuckyStars[i] = luckyStars[i]
+	}
+}
+
+// SetForLife represents the Set For Life lottery game.
+// It draws 5 numbers from a pool of 1 to 47 without replacement.
+// Additionally, it draws 1 Life Ball from a pool of 1 to 10 without replacement.
+type SetForLife struct {
+	Numbers  [5]int
+	LifeBall int
+}
+
+func (s *SetForLife) Draw() {
+	numbers := drawUnique(len(s.Numbers), 47)
+	for i := range s.Numbers {
+		s.Numbers[i] = numbers[i]
+	}
+	s.LifeBall = rand.Intn(10) + 1
+}
+
+// Thunderball represents the Thunderball lottery game.
+// It draws 5 numbers from a pool of 1 to 39 without replacement.
+// Additionally, it draws 1 Thunderball from a pool of 1 to 14 without replacement.
+type Thunderball struct {
+	Numbers     [5]int
+	Thunderball int
+}
+
+func (t *Thunderball) Draw() {
+	numbers := drawUnique(len(t.Numbers), 39)
+	for i := range t.Numbers {
+		t.Numbers[i] = numbers[i]
+	}
+	t.Thunderball = rand.Intn(14) + 1
+}
+
+// Powerball represents the Powerball lottery game.
+// It draws 5 numbers from a pool of 1 to 69 without replacement.
+// Additionally, it draws 1 Powerball from a pool of 1 to 26 without replacement.
+type Powerball struct {
+	Numbers   [5]int
+	Powerball int
+}
+
+func (p *Powerball) Draw() {
+	numbers := drawUnique(len(p.Numbers), 69)
+	for i := range p.Numbers {
+		p.Numbers[i] = numbers[i]
+	}
+	p.Powerball = rand.Intn(26) + 1
+}
+
+// New returns a new instance of the selected lottery game.
+func New(selected Kind) (Lottery, error) {
+	switch selected {
+	case KindLotto:
+		return &Lotto{}, nil
+	case KindEuroMillions:
+		return &EuroMillions{}, nil
+	case KindSetForLife:
+		return &SetForLife{}, nil
+	case KindThunderball:
+		return &Thunderball{}, nil
+	case KindPowerball:
+		return &Powerball{}, nil
+	default:
+		return nil, fmt.Errorf("unknown lottery type: %s", string(selected))
+	}
+}

util.go

@@ -0,0 +1,19 @@
+package lottery
+
+import (
+	"math/rand"
+	"sort"
+)
+
+// 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 {
+	perm := rand.Perm(max)
+	result := make([]int, count)
+	for i := range result {
+		result[i] = perm[i] + 1
+	}
+	sort.Ints(result)
+	return result
+}