feat: separate language settings into dedicated screen (#13)

* feat: separate language settings into dedicated screen

* fix: consolidate locale labels into single translation source

Author: isikawatatsuki

internal/infrastructure/i18n/constants.go

@@ -87,6 +87,7 @@ const (
 
 	SettingsLanguageEnKey = "settings.language.en"
 	SettingsLanguageRuKey = "settings.language.ru"
+	SettingsLanguageJaKey = "settings.language.ja"
 
 	SettingsConfirmSaveKey = "settings.confirm.save"
 

internal/presentation/tui/model.go

@@ -118,7 +118,10 @@ func (m *Model) navigate(to state.ScreenType, params interface{}) tea.Cmd {
 		m.current = screens.NewStatsScreen(m.service, m.translator)
 
 	case state.ScreenSettings:
-		m.current = screens.NewSettingsScreen(m.translator, m.settingsRepo)
+		m.current = screens.NewSettingsScreen(m.translator)
+
+	case state.ScreenLanguageSettings:
+		m.current = screens.NewLanguageSettingsScreen(m.translator, m.settingsRepo)
 	}
 
 	return m.current.Init()

internal/presentation/tui/screens/language_settings_screen.go

@@ -0,0 +1,234 @@
+package screens
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"time"
+
+	tea "github.com/charmbracelet/bubbletea"
+	"github.com/charmbracelet/lipgloss"
+
+	"github.com/ignavan39/mood-diary/internal/domain/entity"
+	"github.com/ignavan39/mood-diary/internal/domain/repository"
+	"github.com/ignavan39/mood-diary/internal/infrastructure/i18n"
+	"github.com/ignavan39/mood-diary/internal/presentation/styles"
+	"github.com/ignavan39/mood-diary/internal/presentation/tui/components"
+	"github.com/ignavan39/mood-diary/internal/presentation/tui/constants"
+	"github.com/ignavan39/mood-diary/internal/presentation/tui/state"
+)
+
+type LanguageSettingsScreen struct {
+	state.BaseState
+
+	translator   i18n.Translator
+	settingsRepo repository.SettingsRepository
+
+	cursor        int
+	locales       []string
+	currentLocale string
+	saved         bool
+}
+
+func NewLanguageSettingsScreen(translator i18n.Translator, settingsRepo repository.SettingsRepository) *LanguageSettingsScreen {
+	supported := i18n.SupportedLocales()
+	locales := make([]string, len(supported))
+	for i, l := range supported {
+		locales[i] = string(l)
+	}
+	return &LanguageSettingsScreen{
+		translator:   translator,
+		settingsRepo: settingsRepo,
+		locales:      locales,
+	}
+}
+
+func (s *LanguageSettingsScreen) t(key string, args ...interface{}) string {
+	if s.translator == nil {
+		return key
+	}
+	return s.translator.T(key, args...)
+}
+
+func (s *LanguageSettingsScreen) Init() tea.Cmd {
+	s.SetLoading(true)
+	return s.loadSettings()
+}
+
+func (s *LanguageSettingsScreen) Update(msg tea.Msg) (state.Screen, tea.Cmd) {
+	switch msg := msg.(type) {
+	case tea.WindowSizeMsg:
+		s.SetSize(msg.Width, msg.Height)
+
+	case tea.KeyMsg:
+		return s.handleKeyMsg(msg)
+
+	case languageSettingsLoadedMsg:
+		s.currentLocale = msg.locale
+		s.SetLoading(false)
+		return s, nil
+
+	case languageSettingsSavedMsg:
+
+		s.saved = true
+		s.SetLoading(false)
+
+		return s, tea.Tick(1200*time.Millisecond, func(t time.Time) tea.Msg {
+			return state.NavigateMsg{To: state.ScreenSettings}
+		})
+
+	case state.ErrorMsg:
+		s.SetError(msg.Error)
+		s.SetLoading(false)
+		return s, nil
+	}
+
+	return s, nil
+}
+
+func (s *LanguageSettingsScreen) handleKeyMsg(msg tea.KeyMsg) (state.Screen, tea.Cmd) {
+	switch msg.String() {
+	case "up", "k":
+		if s.cursor > 0 {
+			s.cursor--
+		}
+
+	case "down", "j":
+		if s.cursor < len(s.locales)-1 {
+			s.cursor++
+		}
+
+	case "enter", " ":
+
+		selectedLocale := s.locales[s.cursor]
+		if selectedLocale != s.currentLocale {
+			s.SetLoading(true)
+			return s, s.saveLocale(selectedLocale)
+		}
+
+	case "esc", "q":
+		return s, state.Navigate(state.ScreenSettings, nil)
+	}
+
+	return s, nil
+}
+
+type languageSettingsLoadedMsg struct {
+	locale string
+}
+
+type languageSettingsSavedMsg struct{}
+
+func (s *LanguageSettingsScreen) loadSettings() tea.Cmd {
+	return func() tea.Msg {
+		ctx := context.Background()
+		settings, err := s.settingsRepo.Get(ctx, entity.SettingsKeyLanguage)
+		if err != nil {
+			return state.ErrorMsg{Error: err}
+		}
+
+		return languageSettingsLoadedMsg{
+			locale: settings.Value,
+		}
+	}
+}
+
+func (s *LanguageSettingsScreen) saveLocale(locale string) tea.Cmd {
+	return func() tea.Msg {
+		ctx := context.Background()
+
+		settings, err := s.settingsRepo.Get(ctx, entity.SettingsKeyLanguage)
+		if err != nil {
+			return state.ErrorMsg{Error: err}
+		}
+
+		settings.Value = locale
+		err = s.settingsRepo.Upsert(ctx, settings)
+		if err != nil {
+			return state.ErrorMsg{Error: err}
+		}
+
+		newLocale := i18n.Locale(locale)
+		_ = s.translator.SetLocale(newLocale)
+
+		s.currentLocale = locale
+
+		return languageSettingsSavedMsg{}
+	}
+}
+
+func (s *LanguageSettingsScreen) View() string {
+	var b strings.Builder
+
+	header := styles.HeaderStyle.Render(s.t(i18n.SettingsOptionLanguageKey))
+	b.WriteString(header)
+	b.WriteString("\n\n")
+
+	if s.Error != nil {
+		b.WriteString(styles.ErrorStyle.Render(s.t(i18n.CommonErrorPrefixKey) + s.Error.Error()))
+		b.WriteString("\n\n")
+	}
+
+	if s.saved {
+		b.WriteString(styles.SuccessStyle.Render(s.t(i18n.SettingsSuccessEditKey)))
+		b.WriteString("\n\n")
+		b.WriteString(styles.HelpStyle.Render(s.t(i18n.CommonReturningKey)))
+		return lipgloss.NewStyle().Padding(2, 4).Render(b.String())
+	}
+
+	if s.Loading {
+		loading := components.NewLoading(s.t(i18n.CommonLoaderMessageKey))
+		b.WriteString(styles.InfoStyle.Render(s.t(i18n.CommonLoaderMessageKey)))
+		b.WriteString("\n")
+		b.WriteString(loading.View())
+		return lipgloss.NewStyle().Padding(2, 4).Render(b.String())
+	}
+
+	b.WriteString(s.renderLanguageSelection())
+	b.WriteString("\n")
+
+	help := styles.HelpStyle.Render(s.t(i18n.HelpNavigationSettingsKey))
+	b.WriteString(help)
+
+	return lipgloss.NewStyle().Padding(2, 4).Render(b.String())
+}
+
+func (s *LanguageSettingsScreen) renderLanguageSelection() string {
+	var b strings.Builder
+
+	b.WriteString(styles.SubtitleStyle.Render(s.t(i18n.SettingsOptionLanguageKey)))
+	b.WriteString("\n\n")
+
+	for i, locale := range s.locales {
+		label := s.getLocaleLabel(locale)
+
+		if i == s.cursor {
+			b.WriteString(constants.ArrowRight + " ")
+			b.WriteString(styles.SelectedListItemStyle.Render(fmt.Sprintf("%s %s", constants.FilledDot, label)))
+			if locale == s.currentLocale {
+				b.WriteString(constants.Checkmark)
+			}
+		} else {
+			b.WriteString("  ")
+			style := styles.ListItemStyle
+			if locale == s.currentLocale {
+				label = label + "  " + constants.Checkmark
+			}
+			b.WriteString(style.Render(fmt.Sprintf("%s %s", constants.EmptyDot, label)))
+		}
+		b.WriteString("\n")
+	}
+
+	b.WriteString("\n")
+
+	return b.String()
+}
+
+func (s *LanguageSettingsScreen) getLocaleLabel(locale string) string {
+	key := "settings.language." + locale
+	name := s.t(key)
+	if name == key {
+		return locale
+	}
+	return fmt.Sprintf("[%s] - %s", strings.ToUpper(locale), name)
+}