Feat: add persisted account theme settings

Backend/internal/bootstrap/settings_theme.go

@@ -0,0 +1,111 @@
+package bootstrap
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"path/filepath"
+	"strings"
+
+	"github.com/jackc/pgx/v5"
+)
+
+const defaultThemePresetID = "moku-midnight"
+
+func personalSettingsPathForDisplayName(displayName string) string {
+	personalName := strings.TrimSpace(displayName)
+	if personalName == "" {
+		personalName = defaultPersonalDisplayName
+	}
+
+	personalSlug := normalizePOSIXSlug(personalName)
+	return filepath.ToSlash(filepath.Join("users", "personals", slugDir("personal", personalSlug), posixSettingsFileName))
+}
+
+func extractThemePresetID(settings map[string]any) string {
+	theme, ok := settings["theme"].(map[string]any)
+	if !ok {
+		return ""
+	}
+
+	presetID, _ := theme["presetId"].(string)
+	return strings.TrimSpace(presetID)
+}
+
+func applyThemePresetToSettings(settings map[string]any, presetID string) map[string]any {
+	normalized := settings
+	if normalized == nil {
+		normalized = map[string]any{}
+	}
+
+	theme, ok := normalized["theme"].(map[string]any)
+	if !ok || theme == nil {
+		theme = map[string]any{}
+	}
+
+	theme["presetId"] = presetID
+	normalized["theme"] = theme
+	return normalized
+}
+
+func (service *Service) SaveThemePreset(ctx context.Context, input SaveThemePresetInput) (*AdminRecord, error) {
+	admin, err := service.GetAdmin(ctx)
+	if err != nil {
+		return nil, err
+	}
+	if admin == nil {
+		return nil, ErrAdminNotConfigured
+	}
+
+	presetID := strings.TrimSpace(input.PresetID)
+	if presetID == "" {
+		return nil, fmt.Errorf("theme preset id is required")
+	}
+
+	rootPath := strings.TrimSpace(service.posixRoot)
+	if rootPath == "" {
+		return nil, fmt.Errorf("posix root is not configured")
+	}
+
+	relativeSettingsPath := personalSettingsPathForDisplayName(admin.DisplayName)
+	absoluteSettingsPath := filepath.Join(rootPath, filepath.FromSlash(relativeSettingsPath))
+	settings := readStructuredFileMap(absoluteSettingsPath)
+	if len(settings) == 0 {
+		return nil, fmt.Errorf("personal settings file is missing")
+	}
+
+	updatedSettings := applyThemePresetToSettings(settings, presetID)
+	if err := writeCBORFile(absoluteSettingsPath, updatedSettings); err != nil {
+		return nil, fmt.Errorf("write personal %s: %w", posixSettingsFileName, err)
+	}
+
+	if err := service.rebuildProjection(ctx); err != nil {
+		return nil, err
+	}
+
+	return service.GetAdmin(ctx)
+}
+
+func (service *Service) loadAdminThemePresetID(ctx context.Context, displayName string) (string, error) {
+	path := personalSettingsPathForDisplayName(displayName)
+
+	var presetID *string
+	err := service.db.Pool.QueryRow(ctx, `
+		SELECT content_json->'theme'->>'presetId'
+		FROM posix_nodes
+		WHERE path = $1
+		LIMIT 1;
+	`, path).Scan(&presetID)
+	if err != nil {
+		if errors.Is(err, pgx.ErrNoRows) {
+			return "", nil
+		}
+		return "", err
+	}
+
+	if presetID == nil {
+		return "", nil
+	}
+
+	return strings.TrimSpace(*presetID), nil
+}