refact round 2

engine/menu.go

@@ -0,0 +1,78 @@
+package engine
+
+import (
+	"fmt"
+	"strings"
+)
+
+// HandlerFunc is the handler type for a menu item
+type HandlerFunc func(*Session)
+
+// Exit is a built-in handler that terminates the session
+var Exit HandlerFunc = func(s *Session) { s.Quit = true }
+
+type menuItem struct {
+	Key     string
+	Label   string
+	Color   string
+	Handler HandlerFunc
+}
+
+// Menu defines the BBS main menu using a declarative DSL
+type Menu struct {
+	title string
+	items []menuItem
+}
+
+// Title sets the menu header
+func (m *Menu) Title(t string) {
+	m.title = t
+}
+
+// Item adds a menu entry (key, display label, ANSI color, handler)
+func (m *Menu) Item(key, label, color string, handler HandlerFunc) {
+	m.items = append(m.items, menuItem{
+		Key:     strings.ToUpper(key),
+		Label:   label,
+		Color:   color,
+		Handler: handler,
+	})
+}
+
+// Dispatch finds and calls the handler for the given key
+func (m *Menu) Dispatch(s *Session, key string) {
+	key = strings.ToUpper(strings.TrimSpace(key))
+	for _, item := range m.items {
+		if item.Key == key {
+			item.Handler(s)
+			return
+		}
+	}
+}
+
+// Render returns the rendered menu string
+func (m *Menu) Render(p *Printer, lang T, username string) string {
+	headerLine := strings.Repeat("═", W)
+	l1 := p.PadLine(fmt.Sprintf("  %s%s%s  %s@%s%s", YL, m.title, R, GY, username, R), W)
+
+	var rows []string
+	for i := 0; i < len(m.items); i += 2 {
+		if i+1 < len(m.items) {
+			left := p.PadLine(fmt.Sprintf("  %s[%s]%s %s", m.items[i].Color, m.items[i].Key, R, m.items[i].Label), W/2)
+			right := p.PadLine(fmt.Sprintf("  %s[%s]%s %s", m.items[i+1].Color, m.items[i+1].Key, R, m.items[i+1].Label), W/2)
+			rows = append(rows, left+right)
+		} else {
+			rows = append(rows, p.PadLine(fmt.Sprintf("  %s[%s]%s %s", m.items[i].Color, m.items[i].Key, R, m.items[i].Label), W))
+		}
+	}
+
+	var sb strings.Builder
+	sb.WriteString(fmt.Sprintf("\n%s╔%s╗%s\n", WH, headerLine, R))
+	sb.WriteString(fmt.Sprintf("%s║%s%s║%s\n", WH, l1, WH, R))
+	sb.WriteString(fmt.Sprintf("%s╠%s╣%s\n", WH, headerLine, R))
+	for _, row := range rows {
+		sb.WriteString(fmt.Sprintf("%s║%s%s║%s\n", WH, row, WH, R))
+	}
+	sb.WriteString(fmt.Sprintf("%s╚%s╝%s\n%s", WH, headerLine, R, lang["Choice"]))
+	return sb.String()
+}