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REFERENCE_PATTERNS.md

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+# Reference Patterns to Adopt
+
+Patterns from `terminal-shop-source` that we're copying into this project.
+
+---
+
+## 1. Footer: Command Array Pattern
+
+### Structs (in model.go or footer.go)
+```go
+type footerState struct {
+    commands []footerCommand
+}
+
+type footerCommand struct {
+    key   string
+    value string
+}
+```
+
+### Setting commands (in each *Switch method)
+```go
+func (m Model) CartSwitch() (Model, tea.Cmd) {
+    m = m.SwitchPage(cartPage)
+    m.footer.commands = []footerCommand{
+        {key: "esc", value: "back"},
+        {key: "↑/↓", value: "items"},
+        {key: "+/-", value: "qty"},
+        {key: "c", value: "checkout"},
+    }
+    m = m.updateCartViewport()
+    return m, nil
+}
+```
+
+### Rendering (footer.go)
+```go
+// Iterate commands instead of if/else chain
+commands := []string{}
+for _, cmd := range m.footer.commands {
+    commands = append(commands, bold(" "+cmd.key+" ")+base(cmd.value+"  "))
+}
+
+// Error display replaces default content when m.ErrorMsg != ""
+```
+
+### Small screen: only show "m menu"
+```go
+if m.size == small {
+    return table.Render(bold("m") + base(" menu"))
+}
+```
+
+---
+
+## 2. Helper Methods
+
+### Cart helpers (add to model.go or cart.go)
+```go
+func (m Model) IsCartEmpty() bool {
+    return len(m.Cart) == 0
+}
+
+func (m Model) CartItemCount() int {
+    return len(m.Cart)
+}
+
+func (m Model) CalculateSubtotal() int {
+    subtotal := 0
+    for _, item := range m.Cart {
+        subtotal += item.Coffee.Price * item.Quantity
+    }
+    return subtotal
+}
+```
+
+### Used in reference for: header cart badge, footer conditional commands, checkout validation, review page totals.
+
+---
+
+## 3. Account View Split
+
+### Reference splits into separate files per sub-view:
+- `account.go` — parent: menu + delegation (~80 lines)
+- `orders.go` — OrdersView() + OrdersUpdate()
+- `subscriptions.go` — SubscriptionsView() + SubscriptionsUpdate()
+- `tokens.go` — TokensView() + TokensUpdate()
+- `apps.go` — AppsView() + AppsUpdate()
+- `faq.go` — FaqView()
+- `about.go` — AboutView() (in account.go, inline)
+
+### Parent dispatches via:
+```go
+func (m model) GetAccountPageContent(accountPage page, width int) string {
+    switch accountPage {
+    case ordersPage:
+        return m.OrdersView(width, m.state.account.focused)
+    case addressesPage:
+        return m.AddressesView(width, m.state.account.focused)
+    // ...
+    }
+}
+```
+
+### Each sub-view owns its own state, cursor, and deletion logic.