terminalShop/pkg/tui/model.go

package tui

import (
	"encoding/json"
	"fmt"
	"log"
	"math"
	"net/http"
	"os"
	"strings"
	"time"

	tea "github.com/charmbracelet/bubbletea"
	gossh "golang.org/x/crypto/ssh"

	"terminalShop/pkg/api"
	"terminalShop/pkg/models"
)

// termSize represents the terminal size category for responsive layout.
type termSize int

const (
	undersized termSize = iota // viewportWidth < 20 || viewportHeight < 10
	small                      // viewportWidth < 50
	medium                     // viewportWidth < 80
	large                      // viewportWidth >= 80
)

// This msg is sent after a debounce delay to apply a pending resize.
// the seq field makes sure that only the tick from the most recent resize is applied.
type resizeTickMsg struct {
	seq int
}

// Delay before applying a terminal resize.
// this prevents flickering when resizing the terminal
const resizeDebounce = 50 * time.Millisecond

type Model struct {
	// User authentication
	User          *models.User    // Authenticated user (nil if not logged in)
	IsNewUser     bool            // True if user needs to register
	SSHPublicKey  gossh.PublicKey // SSH public key for registration
	AccessToken   string
	UsernameInput string // Input for username during registration

	// Shop state
	Username       string
	Coffees        []models.Coffee
	Cursor         int
	Cart           map[uint]*models.CartItem // maps CoffeeID to cart item
	CartCursor     int                       // cursor position in cart view
	AccountCursor  int
	CheckoutStep   int  // 0=cart, 1=shipping, 2=payment, 3=confirmation
	ScrollOffset   int  // scroll position for content
	ViewingCart    bool // true when viewing cart details
	CheckingOut    bool // true while saveCardAndConvert is running
	ViewingAccount bool

	// Menu modal state
	ShowingMenu  bool // true when full-screen menu is showing
	menuLastCart bool // was viewing cart when menu was opened
	menuLastAcct bool // was viewing account when menu was opened

	// Layout fields — responsive container system
	viewportWidth   int      // raw terminal width
	viewportHeight  int      // raw terminal height
	widthContainer  int      // constrained outer container width (max 80)
	heightContainer int      // constrained outer container height (max 30)
	widthContent    int      // widthContainer - 2 (usable inner width)
	size            termSize // current terminal size category

	// Resize debouncing
	resizeSeq     int // incremented on each WindowSizeMsg
	pendingWidth  int // buffered width from latest resize
	pendingHeight int // buffered height from latest resize

	Loading   bool   // true when fetching data from API
	ErrorMsg  string // error message if API fetch fails
	APIClient *api.Client

	// Checkout state
	ShippingForm   *ShippingFormState // Shipping form state (nil when not in shipping step)
	PaymentForm    *PaymentFormState  // Payment form state (nil when not in payment step)
	ShippingInfo   *models.Address    // Selected shipping address for current order
	SavedAddresses []models.Address   // Saved addresses from database
	ShippingView   int
	AddressCursor  int
	StripeKey      string // Stripe publishable key for client-side tokenization

	// Order history
	Orders       []models.Order
	OrdersLoaded bool
}

// updateLayout recalculates all layout variables from the raw viewport dimensions.
// This should be called whenever the terminal is resized.
func (m *Model) updateLayout(width, height int) {
	m.viewportWidth = width
	m.viewportHeight = height

	switch {
	case width < 20 || height < 10:
		m.size = undersized
		m.widthContainer = width
		m.heightContainer = height
	case width < 50:
		m.size = small
		m.widthContainer = width
		m.heightContainer = height
	case width < 80:
		m.size = medium
		m.widthContainer = 50
		m.heightContainer = int(math.Min(float64(height), 30))
	default:
		m.size = large
		m.widthContainer = 80
		m.heightContainer = int(math.Min(float64(height), 30))
	}

	m.widthContent = m.widthContainer - 2
}

// ProductsMsg is sent when products are fetched from API
type ProductsMsg struct {
	Products []models.Coffee
	Err      error
}

// fetchProductsCmd fetches products from the API
func (m Model) fetchProductsCmd() tea.Msg {
	if m.APIClient == nil {
		log.Println("[TUI] APIClient is nil, using fallback products")
		return ProductsMsg{Err: nil} // No API client, use fallback
	}

	log.Printf("[TUI] Fetching products from API at %s", m.APIClient.BaseURL)
	products, err := m.APIClient.GetProducts()
	if err != nil {
		log.Printf("[TUI] Failed to fetch products: %v", err)
	} else {
		log.Printf("[TUI] Loaded %d products from API", len(products))
	}
	return ProductsMsg{Products: products, Err: err}
}

func (m Model) Init() tea.Cmd {
	// Fetch products from API on startup
	return m.fetchProductsCmd
}

func (m Model) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
	// When the shipping form is active, route ALL messages to it.
	// huh generates internal messages (focus, cursor blink, etc.) from
	// form.Init() and form.Update() that must reach the form to work.

	if tick, ok := msg.(resizeTickMsg); ok {
		if tick.seq == m.resizeSeq {
			m.updateLayout(m.pendingWidth, m.pendingHeight)
			// Update active form widths to match the new layout
			if m.ShippingForm != nil {
				m.ShippingForm.form = m.buildShippingForm(m.ShippingForm)
			}
			if m.PaymentForm != nil {
				m.PaymentForm.form = m.buildPaymentForm(m.PaymentForm)
			}
		}
		return m, nil
	}

	if m.ShowingMenu {
		if keyMsg, ok := msg.(tea.KeyMsg); ok {
			switch keyMsg.String() {
			case "s":
				m.ShowingMenu = false
				m.ViewingCart = false
				m.ViewingAccount = false
				m.CheckoutStep = 0
				m.ShippingForm = nil
				m.PaymentForm = nil
				m.ScrollOffset = 0
			case "a":
				m.ShowingMenu = false
				m.ViewingCart = false
				m.ViewingAccount = true
				m.CheckoutStep = 0
				m.ShippingForm = nil
				m.PaymentForm = nil
				m.ScrollOffset = 0
				if !m.OrdersLoaded {
					return m, m.fetchOrdersCmd()
				}
			case "c":
				m.ShowingMenu = false
				m.ViewingCart = true
				m.ViewingAccount = false
				m.CheckoutStep = 0
				m.ShippingForm = nil
				m.PaymentForm = nil
				m.ScrollOffset = 0
			case "esc":
				m.ShowingMenu = false
			case "q", "ctrl+c":
				return m, tea.Quit
			}
		}
		return m, nil
	}

	if m.ViewingCart && m.CheckoutStep == 1 {
		switch msg := msg.(type) {
		case ShippingFormCompleteMsg:
			addr := models.Address{
				Name:    msg.Name,
				Street:  msg.Street1,
				Street2: msg.Street2,
				City:    msg.City,
				State:   msg.State,
				Country: msg.Country,
				Zip:     msg.Zip,
				Phone:   msg.Phone,
			}
			return m, m.saveAddressCmd(addr)

		case AddressesMsg:
			if msg.Err != nil || len(msg.Addresses) == 0 {
				m.SavedAddresses = nil
				m.ShippingView = 1
				m.ShippingForm = m.InitShippingForm()
				return m, m.ShippingForm.form.Init()
			}
			m.SavedAddresses = msg.Addresses
			m.ShippingView = 0
			m.AddressCursor = 0
			m.ShippingForm = nil
			return m, nil

		case AddressSavedMsg:
			if msg.Err != nil {
				log.Printf("address validation failed: %v", msg.Err)
				if m.ShippingForm != nil {
					m.ShippingForm.submitting = false
					m.ShippingForm.form = m.buildShippingForm(m.ShippingForm)
				}
				m.ErrorMsg = "Invalid address. Currently only US and Norwegian addresses are supported."
				return m, m.ShippingForm.form.Init()
			}
			m.ShippingInfo = &msg.Address
			m.ShippingForm = nil
			m.CheckoutStep = 2
			m.PaymentForm = m.InitPaymentForm()
			return m, m.PaymentForm.form.Init()

		case ShippingFormErrorMsg:
			m.ErrorMsg = msg.Message
			return m, nil
		case tea.WindowSizeMsg:
			m.pendingWidth = msg.Width
			m.pendingHeight = msg.Height
			m.resizeSeq++
			seq := m.resizeSeq
			return m, tea.Tick(resizeDebounce, func(t time.Time) tea.Msg {
				return resizeTickMsg{seq: seq}
			})
		}

		// Address list view
		if m.ShippingView == 0 && m.ShippingForm == nil {
			if keyMsg, ok := msg.(tea.KeyMsg); ok {
				m.ErrorMsg = ""
				switch keyMsg.String() {
				case "esc":
					m.CheckoutStep = 0
					m.ErrorMsg = ""
					return m, nil
				case "up", "k":
					if m.AddressCursor > 0 {
						m.AddressCursor--
					}
				case "down", "j":
					if m.AddressCursor < len(m.SavedAddresses) {
						m.AddressCursor++
					}
				case "enter":
					if m.AddressCursor < len(m.SavedAddresses) {
						addr := m.SavedAddresses[m.AddressCursor]
						selected := addr // copy so we have a stable pointer
						m.ShippingInfo = &selected
						m.CheckoutStep = 2
						m.PaymentForm = m.InitPaymentForm()
						return m, m.PaymentForm.form.Init()
					}
					m.ShippingView = 1
					m.ShippingForm = m.InitShippingForm()
					return m, m.ShippingForm.form.Init()
				case "d", "x":
					if m.AddressCursor < len(m.SavedAddresses) {
						addr := m.SavedAddresses[m.AddressCursor]
						m.SavedAddresses = append(m.SavedAddresses[:m.AddressCursor], m.SavedAddresses[m.AddressCursor+1:]...)
						if m.AddressCursor >= len(m.SavedAddresses) && m.AddressCursor > 0 {
							m.AddressCursor--
						}
						if len(m.SavedAddresses) == 0 {
							m.ShippingView = 1
							m.ShippingForm = m.InitShippingForm()
							return m, tea.Batch(m.ShippingForm.form.Init(), m.deleteAddressCmd(addr.ID))
						}
						return m, m.deleteAddressCmd(addr.ID)
					}
				}
			}
			return m, nil
		}

		// Form view
		if m.ShippingForm != nil {
			if keyMsg, ok := msg.(tea.KeyMsg); ok {
				if keyMsg.String() == "esc" {
					m.ErrorMsg = ""
					if len(m.SavedAddresses) > 0 {
						m.ShippingView = 0
						m.ShippingForm = nil
						return m, nil
					}

					m.CheckoutStep = 0
					m.ShippingForm = nil
					return m, nil
				}
				m.ErrorMsg = ""
			}
			cmd := m.UpdateShippingForm(msg, m.ShippingForm)
			return m, cmd
		}
		return m, nil
	}

	// When the payment form is active, route ALL messages to it.
	if m.ViewingCart && m.CheckoutStep == 2 {
		switch msg := msg.(type) {
		case PaymentFormCompleteMsg:
			// kick off Stripe tokenization (runs async)
			if m.PaymentForm != nil {
				return m, m.tokenizeCard(msg)
			}
			return m, nil
		case StripeTokenMsg:
			// Token obtained — save card, set on cart, set address, convert
			m.PaymentForm = nil
			m.CheckingOut = true
			return m, m.saveCardAndConvert(msg)
		case CheckoutResultMsg:
			m.CheckingOut = false
			if msg.Err != nil {
				m.ErrorMsg = fmt.Sprintf("checkout failed: %v", msg.Err)
				m.CheckoutStep = 2
				m.PaymentForm = m.InitPaymentForm()
				return m, m.PaymentForm.form.Init()
			}
			m.CheckoutStep = 3
			return m, nil
		case StripeTokenErrMsg:
			// Tokenization failed, show error and let user retry
			if m.PaymentForm != nil {
				m.PaymentForm.submitting = false
				m.ErrorMsg = fmt.Sprintf("Payment failed: %v", msg.Err)
				m.PaymentForm.form = m.buildPaymentForm(m.PaymentForm)
				return m, m.PaymentForm.form.Init()
			}
			m.ErrorMsg = fmt.Sprintf("Payment failed: %v", msg.Err)
			return m, nil
		case PaymentFormErrorMsg:
			m.ErrorMsg = msg.Message
			return m, nil
		case tea.WindowSizeMsg:
			m.pendingWidth = msg.Width
			m.pendingHeight = msg.Height
			m.resizeSeq++
			seq := m.resizeSeq
			return m, tea.Tick(resizeDebounce, func(t time.Time) tea.Msg {
				return resizeTickMsg{seq: seq}
			})
		case tea.KeyMsg:
			if m.CheckingOut {
				// Ignore all keys while submitting order
				return m, nil
			}
			if msg.String() == "esc" {
				// Go back to shipping
				m.CheckoutStep = 1
				m.PaymentForm = nil
				m.ErrorMsg = ""
				m.ShippingForm = m.InitShippingForm()
				// Restore shipping values if we have them
				if m.ShippingInfo != nil {
					m.ShippingForm.Name = m.ShippingInfo.Name
					m.ShippingForm.Street1 = m.ShippingInfo.Street
					m.ShippingForm.Street2 = m.ShippingInfo.Street2
					m.ShippingForm.City = m.ShippingInfo.City
					m.ShippingForm.State = m.ShippingInfo.State
					m.ShippingForm.Country = m.ShippingInfo.Country
					m.ShippingForm.Zip = m.ShippingInfo.Zip
					m.ShippingForm.Phone = m.ShippingInfo.Phone
					// Rebuild form with restored values
					m.ShippingForm.form = m.buildShippingForm(m.ShippingForm)
				}
				return m, m.ShippingForm.form.Init()
			}
			m.ErrorMsg = ""
		}

		if m.PaymentForm != nil {
			cmd := m.UpdatePaymentForm(msg, m.PaymentForm)
			return m, cmd
		}
		return m, nil
	}

	switch msg := msg.(type) {
	case ShippingFormCompleteMsg:
		addr := models.Address{
			Name:    msg.Name,
			Street:  msg.Street1,
			Street2: msg.Street2,
			City:    msg.City,
			State:   msg.State,
			Country: msg.Country,
			Zip:     msg.Zip,
			Phone:   msg.Phone,
		}
		return m, m.saveAddressCmd(addr)

	case AddressSavedMsg:
		if msg.Err != nil {
			log.Printf("address validation failed: %v", msg.Err)
			if m.ShippingForm != nil {
				m.ShippingForm.submitting = false
				m.ShippingForm.form = m.buildShippingForm(m.ShippingForm)
			}
			m.ErrorMsg = "Invalid address. Currently only US and Norwegian addresses are supported."
			if m.ShippingForm != nil {
				return m, m.ShippingForm.form.Init()
			}
			return m, nil
		}
		m.ShippingInfo = &msg.Address
		m.ShippingForm = nil
		m.CheckoutStep = 2
		m.PaymentForm = m.InitPaymentForm()
		return m, m.PaymentForm.form.Init()

	case ShippingFormErrorMsg:
		m.ErrorMsg = msg.Message
		return m, nil

	case PaymentFormCompleteMsg:
		m.CheckoutStep = 3
		m.PaymentForm = nil
		return m, nil

	case PaymentFormErrorMsg:
		m.ErrorMsg = msg.Message
		return m, nil

	case StripeTokenMsg:
		m.CheckoutStep = 3
		m.PaymentForm = nil
		return m, nil

	case StripeTokenErrMsg:
		m.ErrorMsg = fmt.Sprintf("payment failed: %v", msg.Err)
		return m, nil

	case ProductsMsg:
		m.Loading = false
		if msg.Err != nil {
			m.ErrorMsg = "Failed to load products from API, using fallback data"
			// Keep the fallback products that were set in NewModel
		} else if len(msg.Products) > 0 {
			m.Coffees = msg.Products
			m.ErrorMsg = ""
		}
		return m, nil

	case OrdersMsg:
		if msg.Err == nil {
			m.Orders = msg.Orders
			m.OrdersLoaded = true
		}
		return m, nil

	case AddressesMsg:
		if msg.Err != nil || len(msg.Addresses) == 0 {
			// No saved addresses (or some type of error), go straight
			// to form and skip selecting address since we don't have one saved
			m.SavedAddresses = nil
			m.ShippingView = 1
			m.ShippingForm = m.InitShippingForm()
			return m, m.ShippingForm.form.Init()
		}
		m.SavedAddresses = msg.Addresses
		m.ShippingView = 0
		m.AddressCursor = 0
		m.ShippingForm = nil
		return m, nil

	case AddressDeletedMsg:
		// Address already removed from the in-memory slice in the key handler.
		// Nothing to do here unless there is an error :(
		if msg.Err != nil {
			m.ErrorMsg = fmt.Sprintf("failed to delete address: %v", msg.Err)
		}
		return m, nil

	case tea.WindowSizeMsg:
		m.pendingWidth = msg.Width
		m.pendingHeight = msg.Height
		m.resizeSeq++
		seq := m.resizeSeq
		return m, tea.Tick(resizeDebounce, func(t time.Time) tea.Msg {
			return resizeTickMsg{seq: seq}
		})

	case tea.KeyMsg:
		// Normal shop mode
		switch msg.String() {
		case "ctrl+c", "q":
			return m, tea.Quit

		case "s":
			m.ViewingCart = false
			m.ViewingAccount = false
			m.CheckoutStep = 0
			m.ShippingForm = nil
			m.PaymentForm = nil
			m.ScrollOffset = 0

		case "c":
			m.ViewingCart = true
			m.ViewingAccount = false
			m.CheckoutStep = 0
			m.ShippingForm = nil
			m.PaymentForm = nil
			m.ScrollOffset = 0

		case "a":
			m.ViewingCart = false
			m.ViewingAccount = true
			m.CheckoutStep = 0
			m.ShippingForm = nil
			m.PaymentForm = nil
			m.ScrollOffset = 0
			if !m.OrdersLoaded {
				return m, m.fetchOrdersCmd()
			}

		case "m":
			m.ShowingMenu = true
			m.menuLastCart = m.ViewingCart
			m.menuLastAcct = m.ViewingAccount
			return m, nil

		case "p", "enter":
			// Proceed to checkout from cart
			if m.ViewingCart && m.CheckoutStep == 0 && len(m.Cart) > 0 {
				m.CheckoutStep = 1
				return m, m.fetchAddressesCmd()
			}

		case "esc":
			// From confirmation, go back to shop
			if m.ViewingCart && m.CheckoutStep == 3 {
				m.ViewingCart = false
				m.CheckoutStep = 0
				m.ShippingForm = nil
				m.PaymentForm = nil
				m.ShippingInfo = nil
				m.CheckingOut = false
				m.Cart = make(map[uint]*models.CartItem)
				m.CartCursor = 0
				m.ScrollOffset = 0
				return m, nil
			}
			// Go back in checkout flow
			if m.ViewingCart && m.CheckoutStep > 0 {
				m.CheckoutStep--
				m.ShippingForm = nil
				m.PaymentForm = nil
				return m, nil
			}

		case "up", "k":
			if m.ViewingAccount {
				if m.AccountCursor > 0 {
					m.AccountCursor--
				}
			} else if !m.ViewingCart && !m.ViewingAccount && m.Cursor > 0 {
				m.Cursor--
			} else if m.ViewingCart && m.CartCursor > 0 {
				m.CartCursor--
				// Auto-scroll to keep cursor visible (each cart item is ~5 lines)
				itemHeight := 5
				targetLine := m.CartCursor * itemHeight
				if targetLine < m.ScrollOffset {
					m.ScrollOffset = targetLine
				}
			}

		case "down", "j":
			if m.ViewingAccount {
				if m.AccountCursor < len(models.AccountMenuItems)-1 {
					m.AccountCursor++
				}
			} else if !m.ViewingCart && !m.ViewingAccount && m.Cursor < len(m.Coffees)-1 {
				m.Cursor++
			} else if m.ViewingCart && m.CartCursor < len(m.Cart)-1 {
				m.CartCursor++
				// Auto-scroll to keep cursor visible (each cart item is ~5 lines)
				itemHeight := 5
				targetLine := m.CartCursor * itemHeight
				// Add extra lines to ensure the entire item is visible, not cut off
				targetLineEnd := targetLine + itemHeight

				// Calculate viewport height
				// In cart: header=3, breadcrumbs=2, footer=1, margins=2, buffer=1 = 9
				viewportHeight := m.heightContainer - 9
				if viewportHeight < 6 {
					viewportHeight = 6
				}

				// Scroll if the bottom of item would be beyond viewport
				if targetLineEnd > m.ScrollOffset+viewportHeight {
					// Scroll just enough to show the entire item
					m.ScrollOffset = targetLineEnd - viewportHeight
				}
			}

		case "pgup", "ctrl+u":
			// Scroll up
			m.ScrollOffset -= 3
			if m.ScrollOffset < 0 {
				m.ScrollOffset = 0
			}

		case "pgdown", "ctrl+d":
			// Scroll down
			m.ScrollOffset += 3

		case "+", "=":
			if !m.ViewingCart && !m.ViewingAccount {
				// Increment quantity in shop view (keyed by CoffeeID)
				coffeeID := m.Coffees[m.Cursor].ID
				if item, exists := m.Cart[coffeeID]; exists {
					item.Quantity++
				} else {
					m.Cart[coffeeID] = &models.CartItem{
						CoffeeID: coffeeID,
						Coffee:   m.Coffees[m.Cursor],
						Quantity: 1,
					}
				}
			} else if m.ViewingCart {
				// Increment quantity in cart view
				cartItems := m.GetCartItemsSlice()
				if m.CartCursor >= 0 && m.CartCursor < len(cartItems) {
					cartItems[m.CartCursor].Quantity++
				}
			}

		case "-", "_":
			if !m.ViewingCart && !m.ViewingAccount {
				// Decrement quantity in shop view (keyed by CoffeeID)
				coffeeID := m.Coffees[m.Cursor].ID
				if item, exists := m.Cart[coffeeID]; exists {
					item.Quantity--
					if item.Quantity <= 0 {
						delete(m.Cart, coffeeID)
						// Reset cart cursor if we deleted the last item
						if len(m.Cart) == 0 {
							m.CartCursor = 0
						} else if m.CartCursor >= len(m.Cart) {
							m.CartCursor = len(m.Cart) - 1
						}
					}
				}
			} else if m.ViewingCart {
				// Decrement quantity in cart view
				cartItems := m.GetCartItemsSlice()
				if m.CartCursor >= 0 && m.CartCursor < len(cartItems) {
					cartItems[m.CartCursor].Quantity--
					if cartItems[m.CartCursor].Quantity <= 0 {
						// Delete this item from the cart by CoffeeID
						delete(m.Cart, cartItems[m.CartCursor].CoffeeID)
						// Reset cart cursor
						if len(m.Cart) == 0 {
							m.CartCursor = 0
						} else if m.CartCursor >= len(m.Cart) {
							m.CartCursor = len(m.Cart) - 1
						}
					}
				}
			}
		}
	}
	return m, nil
}

type StripeTokenMsg struct {
	TokenID string
	Last4   string
}

type StripeTokenErrMsg struct {
	Err error
}

type CheckoutResultMsg struct {
	OrderID uint
	Total   int
	Err     error
}

// OrdersMsg is sent when order history is fetched from the API
type OrdersMsg struct {
	Orders []models.Order
	Err    error
}

func (m Model) fetchOrdersCmd() tea.Cmd {
	return func() tea.Msg {
		if m.APIClient == nil || m.User == nil {
			return OrdersMsg{Err: fmt.Errorf("not authenticated")}
		}
		orders, err := m.APIClient.GetOrders()
		return OrdersMsg{Orders: orders, Err: err}
	}
}

// AddressesMsg is sent when sdaved addresses are fetched from the API
type AddressesMsg struct {
	Addresses []models.Address
	Err       error
}

// AddressSavedMsg is sent when an address is saved to the api
type AddressSavedMsg struct {
	Address models.Address
	Err     error
}

type AddressDeletedMsg struct {
	Err error
}

func (m Model) fetchAddressesCmd() tea.Cmd {
	return func() tea.Msg {
		if m.APIClient == nil || m.User == nil {
			return AddressesMsg{Err: fmt.Errorf("not authenticated")}
		}
		addresses, err := m.APIClient.GetAddresses()
		return AddressesMsg{Addresses: addresses, Err: err}
	}
}

func (m Model) saveAddressCmd(addr models.Address) tea.Cmd {
	return func() tea.Msg {
		if m.APIClient == nil || m.User == nil {
			return AddressSavedMsg{Err: fmt.Errorf("not authenticated")}
		}
		saved, err := m.APIClient.CreateAddress(api.CreateAddressRequest{
			Name:    addr.Name,
			Street:  addr.Street,
			Street2: addr.Street2,
			City:    addr.City,
			State:   addr.State,
			Zip:     addr.Zip,
			Country: addr.Country,
			Phone:   addr.Phone,
		})
		if err != nil {
			return AddressSavedMsg{Err: err}
		}
		return AddressSavedMsg{Address: *saved}
	}
}

func (m Model) deleteAddressCmd(id uint) tea.Cmd {
	return func() tea.Msg {
		if m.APIClient == nil || m.User == nil {
			return AddressDeletedMsg{Err: fmt.Errorf("not authenticated")}
		}
		err := m.APIClient.DeleteAddress(id)
		return AddressDeletedMsg{Err: err}
	}
}

func (m Model) tokenizeCard(card PaymentFormCompleteMsg) tea.Cmd {
	return func() tea.Msg {
		// Use the Stripe secret key for server-side tokenization.
		// This is a terminal app running over SSH — there is no browser,
		// so the publishable key / Stripe.js approach does not work.
		// The secret key is allowed to create tokens with raw card data.
		secretKey := os.Getenv("STRIPE_SECRET_KEY")
		if secretKey == "" {
			// Fall back to the publishable key (will fail on most accounts)
			secretKey = m.StripeKey
		}

		data := fmt.Sprintf(
			"card[number]=%s&card[exp_month]=%s&card[exp_year]=%s&card[cvc]=%s",
			card.CardNumber, card.ExpiryMonth, card.ExpiryYear, card.CVC,
		)

		req, err := http.NewRequest("POST", "https://api.stripe.com/v1/tokens", strings.NewReader(data))
		if err != nil {
			return StripeTokenErrMsg{Err: err}
		}
		req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
		req.Header.Set("Authorization", "Bearer "+secretKey)

		resp, err := http.DefaultClient.Do(req)
		if err != nil {
			return StripeTokenErrMsg{Err: err}
		}
		defer resp.Body.Close()

		var result struct {
			ID   string `json:"id"`
			Card struct {
				Last4 string `json:"last4"`
				Brand string `json:"brand"`
			} `json:"card"`
			Error *struct {
				Message string `json:"message"`
			} `json:"error"`
		}

		if err := json.NewDecoder(resp.Body).Decode(&result); err != nil {
			return StripeTokenErrMsg{Err: err}
		}

		if result.Error != nil {
			return StripeTokenErrMsg{Err: fmt.Errorf("%s", result.Error.Message)}
		}

		return StripeTokenMsg{
			TokenID: result.ID,
			Last4:   result.Card.Last4,
		}
	}
}

// saveCardAndConvert saves the tokenized card, syncs cart items to the server,
// sets address and card on the server cart, then converts the cart to an order.
func (m Model) saveCardAndConvert(tok StripeTokenMsg) tea.Cmd {
	return func() tea.Msg {
		if m.APIClient == nil {
			return CheckoutResultMsg{Err: fmt.Errorf("API client not available")}
		}

		// 1. Save the card
		card, err := m.APIClient.SaveCard(tok.TokenID)
		if err != nil {
			// Card may already exist — try fetching existing cards
			cards, listErr := m.APIClient.GetCards()
			if listErr != nil || len(cards) == 0 {
				return CheckoutResultMsg{Err: fmt.Errorf("failed to save card: %w", err)}
			}
			// Use the most recent card
			card = &cards[0]
		}

		// 2. Sync cart items to the server
		items := m.GetCartItemsSlice()
		for _, item := range items {
			_, err := m.APIClient.SetCartItem(item.CoffeeID, item.Quantity)
			if err != nil {
				return CheckoutResultMsg{Err: fmt.Errorf("failed to sync cart: %w", err)}
			}
		}

		// 3. Set the shipping address on the cart
		if m.ShippingInfo != nil && m.ShippingInfo.ID != 0 {
			if err := m.APIClient.SetCartAddress(m.ShippingInfo.ID); err != nil {
				return CheckoutResultMsg{Err: fmt.Errorf("failed to set address: %w", err)}
			}
		} else if m.ShippingInfo != nil {
			// Address was entered fresh (not from saved list), save it first
			saved, err := m.APIClient.CreateAddress(api.CreateAddressRequest{
				Name:    m.ShippingInfo.Name,
				Street:  m.ShippingInfo.Street,
				Street2: m.ShippingInfo.Street2,
				City:    m.ShippingInfo.City,
				State:   m.ShippingInfo.State,
				Zip:     m.ShippingInfo.Zip,
				Country: m.ShippingInfo.Country,
				Phone:   m.ShippingInfo.Phone,
			})
			if err != nil {
				return CheckoutResultMsg{Err: fmt.Errorf("failed to save address: %w", err)}
			}
			if err := m.APIClient.SetCartAddress(saved.ID); err != nil {
				return CheckoutResultMsg{Err: fmt.Errorf("failed to set address: %w", err)}
			}
		}

		// 4. Set the card on the cart
		if err := m.APIClient.SetCartCard(card.ID); err != nil {
			return CheckoutResultMsg{Err: fmt.Errorf("failed to set card: %w", err)}
		}

		// 5. Convert the cart to an order
		order, err := m.APIClient.ConvertCart()
		if err != nil {
			return CheckoutResultMsg{Err: err}
		}

		return CheckoutResultMsg{
			OrderID: order.ID,
			Total:   order.Total,
		}
	}
}

// GetCartItemsSlice converts the cart map to a sorted slice for consistent iteration.
func (m Model) GetCartItemsSlice() []*models.CartItem {
	// Get keys and sort them for stable ordering
	keys := make([]uint, 0, len(m.Cart))
	for key := range m.Cart {
		keys = append(keys, key)
	}

	// Sort keys to ensure consistent order
	for i := 0; i < len(keys); i++ {
		for j := i + 1; j < len(keys); j++ {
			if keys[i] > keys[j] {
				keys[i], keys[j] = keys[j], keys[i]
			}
		}
	}

	// Build items slice in sorted order
	items := make([]*models.CartItem, 0, len(m.Cart))
	for _, key := range keys {
		items = append(items, m.Cart[key])
	}
	return items
}

// NewModel creates a new model with default coffee options
func NewModel(username string) Model {
	m := Model{
		Username: username,
		Coffees: []models.Coffee{
			{
				Name:        "Espresso",
				RoastType:   "Dark Roast",
				Ounces:      2,
				BeanType:    "Arabica",
				Price:       3.50,
				Color:       "#8B4513",
				Description: "A bold, concentrated shot of pure coffee bliss. Perfect for those who need an immediate caffeine injection to survive the day.",
			},
			{
				Name:        "Latte",
				RoastType:   "Medium Roast",
				Ounces:      12,
				BeanType:    "Arabica Blend",
				Price:       5.00,
				Color:       "#D2691E",
				Description: "Smooth espresso paired with steamed milk and a light layer of foam. For when you want coffee but also want to feel fancy about it.",
			},
			{
				Name:        "Cappuccino",
				RoastType:   "Medium Roast",
				Ounces:      8,
				BeanType:    "Italian Blend",
				Price:       4.50,
				Color:       "#CD853F",
				Description: "Equal parts espresso, steamed milk, and foam. The classic Italian choice for people who know what they're doing.",
			},
			{
				Name:        "Americano",
				RoastType:   "Dark Roast",
				Ounces:      16,
				BeanType:    "Arabica",
				Price:       4.00,
				Color:       "#A0522D",
				Description: "Espresso with hot water. Simple, strong, and no-nonsense. This is coffee for people who actually like the taste of coffee.",
			},
			{
				Name:        "Mocha",
				RoastType:   "Medium Roast",
				Ounces:      16,
				BeanType:    "Colombian",
				Price:       5.50,
				Color:       "#4682B4",
				Description: "Some really good Mocha",
			},
			{
				Name:        "Macchiato",
				RoastType:   "Dark Roast",
				Ounces:      3,
				BeanType:    "Robusta Blend",
				Price:       4.25,
				Color:       "#DAA520",
				Description: "Espresso 'marked' with a dollop of foamed milk. Small but mighty, like a tiny caffeinated warrior.",
			},
		},
		Cursor:         0,
		Cart:           make(map[uint]*models.CartItem),
		CartCursor:     0,
		AccountCursor:  0,
		ViewingCart:    false,
		ViewingAccount: false,
		Loading:        true,
		APIClient:      api.NewClient("http://localhost:8080", ""),
		StripeKey:      os.Getenv("STRIPE_PUBLIC_KEY"),
	}
	m.updateLayout(120, 30)
	return m
}

// NewModelWithAuth creates a new model with user authentication context
func NewModelWithAuth(user *models.User, isNewUser bool, pubKey gossh.PublicKey, token string, apiURL string) Model {
	username := "guest"
	if user != nil {
		username = user.Name
	}

	m := NewModel(username)
	m.User = user
	m.IsNewUser = isNewUser
	m.SSHPublicKey = pubKey
	m.AccessToken = token
	if apiURL != "" {
		m.APIClient = api.NewClient(apiURL, token)
	} else {
		m.APIClient = api.NewClient("http://localhost:8080", token)
	}

	return m
}