Adding Cache

internal/api/cache.go

@@ -0,0 +1,52 @@
+package api
+
+import (
+	"crypto/sha256"
+	"encoding/hex"
+	"os"
+	"path/filepath"
+)
+
+type FileCache struct {
+	dir string
+}
+
+func NewFileCache() *FileCache {
+	var cacheDir string
+	userCacheDir, err := os.UserCacheDir()
+	if err == nil {
+		cacheDir = filepath.Join(userCacheDir, "box-box", "openf1")
+	} else {
+		// Fallback to a local .cache directory
+		cacheDir = ".cache/box-box/openf1"
+	}
+
+	// Ensure the cache directory exists
+	_ = os.MkdirAll(cacheDir, 0755)
+
+	return &FileCache{
+		dir: cacheDir,
+	}
+}
+
+func (c *FileCache) getCachePath(key string) string {
+	hash := sha256.Sum256([]byte(key))
+	filename := hex.EncodeToString(hash[:]) + ".json"
+	return filepath.Join(c.dir, filename)
+}
+
+// Get retrieves data from the cache. Returns nil, false if not found.
+func (c *FileCache) Get(key string) ([]byte, bool) {
+	path := c.getCachePath(key)
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return nil, false
+	}
+	return data, true
+}
+
+// Set saves data to the cache.
+func (c *FileCache) Set(key string, data []byte) error {
+	path := c.getCachePath(key)
+	return os.WriteFile(path, data, 0644)
+}

internal/api/client.go

@@ -8,11 +8,13 @@ import (
 type OpenF1Client struct {
 	url        string
 	httpClient *http.Client
+	cache      *FileCache
 }
 
 func NewOpenF1Client(url string, timeout time.Duration) *OpenF1Client {
 	return &OpenF1Client{
 		url:        url,
 		httpClient: &http.Client{Timeout: timeout},
+		cache:      NewFileCache(),
 	}
 }

internal/api/openf1.go

@@ -1,6 +1,7 @@
 package api
 
 import (
+	"bytes"
 	"encoding/json"
 	"errors"
 	"fmt"
@@ -12,17 +13,31 @@ import (
 )
 
 // get performs a GET request and returns the response body, or an error if the
-// status code is not 200 OK.
+// status code is not 200 OK. It checks a local file cache before making the request.
 func (c *OpenF1Client) get(url string) (io.ReadCloser, error) {
+	if cachedData, ok := c.cache.Get(url); ok {
+		return io.NopCloser(bytes.NewReader(cachedData)), nil
+	}
+
 	resp, err := c.httpClient.Get(url)
 	if err != nil {
 		return nil, err
 	}
+	defer resp.Body.Close()
+
 	if resp.StatusCode != http.StatusOK {
-		resp.Body.Close()
 		return nil, fmt.Errorf("openf1 API returned status %d for %s", resp.StatusCode, url)
 	}
-	return resp.Body, nil
+
+	data, err := io.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	// Save to cache (ignoring errors as cache is not critical)
+	_ = c.cache.Set(url, data)
+
+	return io.NopCloser(bytes.NewReader(data)), nil
 }
 
 func (c *OpenF1Client) GetMeetingsForYear(year int) ([]models.Meeting, error) {
@@ -134,6 +149,29 @@ func (c *OpenF1Client) getLatestRaceSessionKey() (int, error) {
 	return sessions[len(sessions)-1].SessionKey, nil
 }
 
+// getLatestRaceSessionKeyForYear returns the session_key of the most recent Race session
+// for a specific year.
+func (c *OpenF1Client) getLatestRaceSessionKeyForYear(year int) (int, error) {
+	// The OpenF1 API doesn't support a direct year filter on sessions yet (verified by docs/common patterns)
+	// so we'll fetch meetings for that year first, then find the latest session.
+	// Actually, session endpoint does support year filter according to some versions of docs.
+	// Let's try year filter first as it's more efficient.
+	body, err := c.get(fmt.Sprintf("%s/v1/sessions?session_name=Race&year=%d", c.url, year))
+	if err != nil {
+		return 0, err
+	}
+	defer body.Close()
+
+	var sessions []models.Session
+	if err := json.NewDecoder(body).Decode(&sessions); err != nil {
+		return 0, err
+	}
+	if len(sessions) == 0 {
+		return 0, fmt.Errorf("no Race sessions found for year %d", year)
+	}
+	return sessions[len(sessions)-1].SessionKey, nil
+}
+
 // GetLatestDriverChampionship returns championship standings for the most recent
 // Race session. It resolves the latest session key automatically.
 func (c *OpenF1Client) GetLatestDriverChampionship() ([]models.ChampionshipDriver, error) {
@@ -144,6 +182,14 @@ func (c *OpenF1Client) GetLatestDriverChampionship() ([]models.ChampionshipDrive
 	return c.GetDriverChampionship(sessionKey)
 }
 
+func (c *OpenF1Client) GetDriverChampionshipForYear(year int) ([]models.ChampionshipDriver, error) {
+	sessionKey, err := c.getLatestRaceSessionKeyForYear(year)
+	if err != nil {
+		return nil, fmt.Errorf("could not resolve latest race session for year %d: %w", year, err)
+	}
+	return c.GetDriverChampionship(sessionKey)
+}
+
 func (c *OpenF1Client) GetLatestTeamChampionship() ([]models.ChampionshipTeam, error) {
 	sessionKey, err := c.getLatestRaceSessionKey()
 	if err != nil {
@@ -152,6 +198,14 @@ func (c *OpenF1Client) GetLatestTeamChampionship() ([]models.ChampionshipTeam, e
 	return c.GetTeamChampionship(sessionKey)
 }
 
+func (c *OpenF1Client) GetTeamChampionshipForYear(year int) ([]models.ChampionshipTeam, error) {
+	sessionKey, err := c.getLatestRaceSessionKeyForYear(year)
+	if err != nil {
+		return nil, fmt.Errorf("could not resolve latest race session for year %d: %w", year, err)
+	}
+	return c.GetTeamChampionship(sessionKey)
+}
+
 func (c *OpenF1Client) GetSessionResult(sessionKey int) ([]models.SessionResult, error) {
 	body, err := c.get(fmt.Sprintf("%s/v1/session_result?session_key=%d", c.url, sessionKey))
 	if err != nil {

internal/ui/app.go

@@ -26,6 +26,7 @@ type AppModel struct {
 	client *api.OpenF1Client
 
 	activeTab tabIndex
+	year      int
 	width     int
 	height    int
 
@@ -37,11 +38,13 @@ type AppModel struct {
 
 // NewAppModel creates the root model and wires sub-models.
 func NewAppModel(client *api.OpenF1Client) AppModel {
+	year := 2025
 	return AppModel{
 		client:     client,
 		activeTab:  tabStandings,
-		standings:  NewStandingsModel(client),
-		calendar:   NewCalendarModel(client),
+		year:       year,
+		standings:  NewStandingsModel(client, year),
+		calendar:   NewCalendarModel(client, year),
 		raceDetail: NewRaceDetailModel(client),
 		driver:     NewDriverModel(client),
 	}
@@ -95,6 +98,23 @@ func (m AppModel) Update(msg tea.Msg) (tea.Model, tea.Cmd) {
 				m.activeTab = tabCalendar
 				return m, nil
 			}
+		case "y":
+			// Cycle years: 2025 -> 2023 -> 2024 -> 2025
+			if m.year == 2025 {
+				m.year = 2023
+			} else {
+				m.year++
+			}
+			// Update sub-models and re-trigger fetches
+			m.calendar.year = m.year
+			m.calendar.loading = true
+			m.standings.year = m.year
+			m.standings.loading = true
+
+			return m, tea.Batch(
+				m.calendar.Init(),
+				m.standings.Init(),
+			)
 		}
 
 	case meetingSelectedMsg:

internal/ui/calendar.go

@@ -19,11 +19,12 @@ type CalendarModel struct {
 	err      error
 	spinner  spinner.Model
 	cursor   int
+	year     int
 	width    int
 	height   int
 }
 
-func NewCalendarModel(client *api.OpenF1Client) CalendarModel {
+func NewCalendarModel(client *api.OpenF1Client, year int) CalendarModel {
 	s := spinner.New()
 	s.Spinner = spinner.MiniDot
 	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color(colorF1Red))
@@ -31,6 +32,7 @@ func NewCalendarModel(client *api.OpenF1Client) CalendarModel {
 		client:  client,
 		loading: true,
 		spinner: s,
+		year:    year,
 	}
 }
 
@@ -44,7 +46,7 @@ func fetchMeetings(client *api.OpenF1Client, year int) tea.Cmd {
 func (m CalendarModel) Init() tea.Cmd {
 	return tea.Batch(
 		m.spinner.Tick,
-		fetchMeetings(m.client, 2025),
+		fetchMeetings(m.client, m.year),
 	)
 }
 
@@ -108,13 +110,13 @@ func (m CalendarModel) findNextRaceIndex() int {
 
 func (m CalendarModel) View() string {
 	if m.loading {
-		return fmt.Sprintf("\n  %s  Loading 2025 calendar…", m.spinner.View())
+		return fmt.Sprintf("\n  %s  Loading %d calendar…", m.spinner.View(), m.year)
 	}
 	if m.err != nil {
 		return styleError.Render(fmt.Sprintf("\n  Error: %v", m.err))
 	}
 	if len(m.meetings) == 0 {
-		return styleMuted.Render("\n  No meetings found for 2025.")
+		return styleMuted.Render(fmt.Sprintf("\n  No meetings found for %d.", m.year))
 	}
 
 	const (
@@ -179,9 +181,10 @@ func (m CalendarModel) View() string {
 	}
 
 	var sb strings.Builder
+	sb.WriteString(styleBold.Render(fmt.Sprintf(" Season: %d", m.year)) + "\n\n")
 	sb.WriteString(strings.Join(rows, "\n"))
 	sb.WriteString("\n\n")
-	sb.WriteString(helpBar("j/k navigate", "enter select race", "q quit"))
+	sb.WriteString(helpBar("y season", "j/k navigate", "enter select race", "q quit"))
 	return sb.String()
 }
 

internal/ui/keys.go

@@ -13,6 +13,7 @@ type GlobalKeyMap struct {
 	Down  key.Binding
 	Enter key.Binding
 	Back  key.Binding
+	Year  key.Binding
 }
 
 // GlobalKeys is the singleton global key map.
@@ -53,6 +54,10 @@ var GlobalKeys = GlobalKeyMap{
 		key.WithKeys("b"),
 		key.WithHelp("b", "back"),
 	),
+	Year: key.NewBinding(
+		key.WithKeys("y"),
+		key.WithHelp("y", "switch year"),
+	),
 }
 
 // StandingsKeyMap holds standing-specific keybindings.

internal/ui/standings.go

@@ -30,12 +30,13 @@ type StandingsModel struct {
 	err     error
 	spinner spinner.Model
 
+	year   int
 	cursor int
 	width  int
 	height int
 }
 
-func NewStandingsModel(client *api.OpenF1Client) StandingsModel {
+func NewStandingsModel(client *api.OpenF1Client, year int) StandingsModel {
 	s := spinner.New()
 	s.Spinner = spinner.MiniDot
 	s.Style = lipgloss.NewStyle().Foreground(lipgloss.Color(colorF1Red))
@@ -45,27 +46,28 @@ func NewStandingsModel(client *api.OpenF1Client) StandingsModel {
 		loading: true,
 		spinner: s,
 		drivers: make(map[int]models.Driver),
+		year:    year,
 	}
 }
 
 func (m StandingsModel) Init() tea.Cmd {
 	return tea.Batch(
 		m.spinner.Tick,
-		fetchDriverChampionship(m.client),
-		fetchTeamChampionship(m.client),
+		fetchDriverChampionship(m.client, m.year),
+		fetchTeamChampionship(m.client, m.year),
 	)
 }
 
-func fetchDriverChampionship(client *api.OpenF1Client) tea.Cmd {
+func fetchDriverChampionship(client *api.OpenF1Client, year int) tea.Cmd {
 	return func() tea.Msg {
-		standings, err := client.GetLatestDriverChampionship()
+		standings, err := client.GetDriverChampionshipForYear(year)
 		return driverChampionshipLoadedMsg{standings: standings, err: err}
 	}
 }
 
-func fetchTeamChampionship(client *api.OpenF1Client) tea.Cmd {
+func fetchTeamChampionship(client *api.OpenF1Client, year int) tea.Cmd {
 	return func() tea.Msg {
-		standings, err := client.GetLatestTeamChampionship()
+		standings, err := client.GetTeamChampionshipForYear(year)
 		return teamChampionshipLoadedMsg{standings: standings, err: err}
 	}
 }
@@ -138,7 +140,7 @@ func (m StandingsModel) Update(msg tea.Msg) (StandingsModel, tea.Cmd) {
 
 func (m StandingsModel) View() string {
 	if m.loading {
-		return fmt.Sprintf("\n  %s  Loading championship standings…", m.spinner.View())
+		return fmt.Sprintf("\n  %s  Loading %d championship standings…", m.spinner.View(), m.year)
 	}
 	if m.err != nil {
 		return styleError.Render(fmt.Sprintf("\n  Error: %v", m.err))
@@ -146,6 +148,9 @@ func (m StandingsModel) View() string {
 
 	var sb strings.Builder
 
+	// Year indicator
+	sb.WriteString(styleBold.Render(fmt.Sprintf(" Season: %d", m.year)) + "\n\n")
+
 	// Toggle bar
 	dStyle, cStyle := styleInactiveTab, styleInactiveTab
 	if m.view == standingsViewDriver {
@@ -166,7 +171,7 @@ func (m StandingsModel) View() string {
 	}
 
 	sb.WriteString("\n")
-	sb.WriteString(helpBar("d drivers", "c constructors", "j/k navigate", "q quit"))
+	sb.WriteString(helpBar("y season", "d drivers", "c constructors", "j/k navigate", "q quit"))
 	return sb.String()
 }