Function SuggestRegions

internal/semantic/semantic.go:256–332

SuggestRegions returns filtered region suggestions.

(
	query string,
	allRegions []string,
	productRegions map[string][]string,
	productTags []string,
	selectedTags []string,
)

// SuggestRegions returns filtered region suggestions.
func SuggestRegions(
	query string,
	allRegions []string,
	productRegions map[string][]string,
	productTags []string,
	selectedTags []string,
) []SuggestionItem {
	q := strings.ToLower(query)

	// Build region->providers map
	regionProviders := map[string]map[string]struct{}{}
	for productKey, regs := range productRegions {
		parts := strings.Fields(productKey)
		provider := productKey
		if len(parts) > 0 {
			provider = parts[0]
		}
		for _, r := range regs {
			if r == "" {
				continue
			}
			if regionProviders[r] == nil {
				regionProviders[r] = map[string]struct{}{}
			}
			regionProviders[r][provider] = struct{}{}
		}
	}

	var regions []string
	if len(productTags) == 0 {
		regions = append([]string{}, allRegions...)
		sort.Strings(regions)
	} else {
		seen := map[string]struct{}{}
		for _, p := range productTags {
			if regs, ok := productRegions[strings.ToLower(p)]; ok {
				for _, r := range regs {
					if r != "" {
						seen[r] = struct{}{}
					}
				}
			}
		}
		if len(seen) == 0 {
			regions = append([]string{}, allRegions...)
		} else {
			for r := range seen {
				regions = append(regions, r)
			}
		}
		sort.Strings(regions)
	}

	var items []SuggestionItem
	for _, r := range regions {
		if q != "" && !strings.Contains(strings.ToLower(r), q) {
			continue
		}