6 files changed, 232 insertions, 0 deletions
diff --git a/pkg/client/input.go b/pkg/client/input.go
new file mode 100644
index 0000000..8c814a6
--- /dev/null
+++ b/pkg/client/input.go
@@ -0,0 +1,26 @@
+package client
+
+import (
+	"bufio"
+	"os"
+
+	"github.com/pkg/errors"
+)
+
+// getValidInput returns the selected menu command as a string or an error
+func (s *State) getValidInput() (string, error) {
+	menu := s.config.Menus[s.currentMenu]
+
+	reader := bufio.NewReader(os.Stdin)
+	for {
+		input, err := reader.ReadByte()
+		if err != nil {
+			return "", errors.Wrapf(err, "Could not read byte from stdin")
+		}
+		for _, menuEntry := range menu.MenuEntries {
+			if []byte(menuEntry.Key)[0] == input {
+				return menuEntry.Action, nil
+			}
+		}
+	}
+}
diff --git a/pkg/client/input_test.go b/pkg/client/input_test.go
new file mode 100644
index 0000000..f74a097
--- /dev/null
+++ b/pkg/client/input_test.go
@@ -0,0 +1,60 @@
+package client
+
+import (
+	"os"
+	"shell-game-launcher/pkg/config"
+	"testing"
+)
+
+func TestGetValidInput(t *testing.T) {
+	realStdin := os.Stdin
+	t.Cleanup(func() { os.Stdin = realStdin })
+
+	// Complete menu, no input error
+	state := State{
+		config: &config.Config{
+			Menus: map[string]config.Menu{
+				"test": config.Menu{
+					Banner: "TEST TEST TEST",
+					MenuEntries: []config.MenuEntry{
+						config.MenuEntry{
+							Key:    "w",
+							Label:  "wait entry",
+							Action: "wait",
+						},
+						config.MenuEntry{
+							Key:    "q",
+							Label:  "quit entry",
+							Action: "quit",
+						},
+					},
+				},
+			},
+		},
+		currentMenu: "test",
+		login:       "",
+	}
+	r, w, _ := os.Pipe()
+	os.Stdin = r
+
+	// Simply test quit entry
+	w.WriteString("q")
+	if cmd, err := state.getValidInput(); err != nil || cmd != "quit" {
+		t.Fatalf("Input handled incorrectly:\nwant: wait\ngot: %s\nerror: %s\n", cmd, err)
+	}
+	// test quit entry after wrong keys
+	w.WriteString("abcdq")
+	if cmd, err := state.getValidInput(); err != nil || cmd != "quit" {
+		t.Fatalf("Input handled incorrectly:\nwant: wait\ngot: %s\nerror: %s\n", cmd, err)
+	}
+	// test wait entry with valid quit after
+	w.WriteString("wq")
+	if cmd, err := state.getValidInput(); err != nil || cmd != "wait" {
+		t.Fatalf("Input handled incorrectly:\nwant: wait\ngot: %s\nerror: %s\n", cmd, err)
+	}
+	// test input error
+	w.Close()
+	if cmd, err := state.getValidInput(); err == nil {
+		t.Fatalf("Input handled incorrectly:\nwant: wait\ngot: %s\nerror: %s\n", cmd, err)
+	}
+}
diff --git a/pkg/client/menu.go b/pkg/client/menu.go
new file mode 100644
index 0000000..f6de082
--- /dev/null
+++ b/pkg/client/menu.go
@@ -0,0 +1,17 @@
+package client
+
+import "fmt"
+
+func (s *State) displayMenu() {
+	menu := s.config.Menus[s.currentMenu]
+	fmt.Print("\033[2J") // clear the screen
+	fmt.Printf("%s\n\n", menu.Banner)
+	if s.login == "" {
+		fmt.Print("Not logged in.\n\n")
+	} else {
+		fmt.Printf("Logged in as: %s\n\n", s.login)
+	}
+	for i := 0; i < len(menu.MenuEntries); i++ {
+		fmt.Printf("%s) %s\n", menu.MenuEntries[i].Key, menu.MenuEntries[i].Label)
+	}
+}
diff --git a/pkg/client/menu_test.go b/pkg/client/menu_test.go
new file mode 100644
index 0000000..35964d8
--- /dev/null
+++ b/pkg/client/menu_test.go
@@ -0,0 +1,92 @@
+package client
+
+import (
+	"io/ioutil"
+	"os"
+	"reflect"
+	"shell-game-launcher/pkg/config"
+	"testing"
+)
+
+func TestDisplayMenu(t *testing.T) {
+	realStdout := os.Stdout
+	t.Cleanup(func() { os.Stdout = realStdout })
+	r, w, _ := os.Pipe()
+	os.Stdout = w
+
+	// Complete menu, while not logged in
+	state := State{
+		config: &config.Config{
+			Menus: map[string]config.Menu{
+				"test": config.Menu{
+					Banner: "TEST TEST TEST",
+					MenuEntries: []config.MenuEntry{
+						config.MenuEntry{
+							Key:    "q",
+							Label:  "quit entry",
+							Action: "quit",
+						},
+					},
+				},
+			},
+		},
+		currentMenu: "test",
+		login:       "",
+	}
+	want := []byte("\033[2J" +
+		"TEST TEST TEST\n" +
+		"\n" +
+		"Not logged in.\n" +
+		"\n" +
+		"q) quit entry\n")
+	state.displayMenu()
+	// back to normal state
+	w.Close()
+	out, _ := ioutil.ReadAll(r)
+	if !reflect.DeepEqual(out, want) {
+		t.Fatalf("menu displayed incorrectly:\nwant:%+v\ngot: %+v", want, out)
+	}
+
+	// Complete menu, while logged in
+	r, w, _ = os.Pipe()
+	os.Stdout = w
+
+	// Complete menu, while not logged in
+	state = State{
+		config: &config.Config{
+			Menus: map[string]config.Menu{
+				"test": config.Menu{
+					Banner: "TEST TEST TEST",
+					MenuEntries: []config.MenuEntry{
+						config.MenuEntry{
+							Key:    "w",
+							Label:  "wait entry",
+							Action: "wait",
+						},
+						config.MenuEntry{
+							Key:    "q",
+							Label:  "quit entry",
+							Action: "quit",
+						},
+					},
+				},
+			},
+		},
+		currentMenu: "test",
+		login:       "test",
+	}
+	want = []byte("\033[2J" +
+		"TEST TEST TEST\n" +
+		"\n" +
+		"Logged in as: test\n" +
+		"\n" +
+		"w) wait entry\n" +
+		"q) quit entry\n")
+	state.displayMenu()
+	// back to normal state
+	w.Close()
+	out, _ = ioutil.ReadAll(r)
+	if !reflect.DeepEqual(out, want) {
+		t.Fatalf("menu displayed incorrectly:\nwant:%+v\ngot: %+v", want, out)
+	}
+}
diff --git a/pkg/client/state.go b/pkg/client/state.go
new file mode 100644
index 0000000..576721c
--- /dev/null
+++ b/pkg/client/state.go
@@ -0,0 +1,23 @@
+package client
+
+import (
+	"shell-game-launcher/pkg/config"
+)
+
+type State struct {
+	config      *config.Config
+	currentMenu string
+	login       string
+}
+
+func NewState(config *config.Config, login string) *State {
+	cs := State{
+		config:      config,
+		currentMenu: "anonymous",
+		login:       login,
+	}
+	if login != "" {
+		cs.currentMenu = "logged_in"
+	}
+	return &cs
+}
diff --git a/pkg/client/state_test.go b/pkg/client/state_test.go
new file mode 100644
index 0000000..917c211
--- /dev/null
+++ b/pkg/client/state_test.go
@@ -0,0 +1,14 @@
+package client
+
+import "testing"
+
+func TestNewState(t *testing.T) {
+	// Empty login
+	if s := NewState(nil, ""); s.currentMenu != "anonymous" {
+		t.Fatal("a new state without login should init to anonymous")
+	}
+	// logged_in
+	if s := NewState(nil, "test"); s.currentMenu != "logged_in" {
+		t.Fatal("a new state with login should init to logged_in")
+	}
+}