Add street_view_url field to extract Street View panorama links

Extract panoid from Street View thumbnail URLs in category images
and construct a direct Google Maps Street View URL that opens
the panorama view of the location.

URL format: https://www.google.com/maps/@?api=1&map_action=pano&pano={panoid}

Author: dredozubov

gmaps/entry.go

@@ -6,12 +6,15 @@ import (
 	"iter"
 	"math"
 	"net/url"
+	"regexp"
 	"runtime/debug"
 	"slices"
 	"strconv"
 	"strings"
 )
 
+var panoidRegex = regexp.MustCompile(`panoid=([^&]+)`)
+
 type Image struct {
 	Title string `json:"title"`
 	Image string `json:"image"`
@@ -84,6 +87,7 @@ type Entry struct {
 	Timezone            string                 `json:"timezone"`
 	PriceRange          string                 `json:"price_range"`
 	DataID              string                 `json:"data_id"`
+	StreetViewURL       string                 `json:"street_view_url"`
 	Images              []Image                `json:"images"`
 	Reservations        []LinkSource           `json:"reservations"`
 	OrderOnline         []LinkSource           `json:"order_online"`
@@ -180,6 +184,7 @@ func (e *Entry) CsvHeaders() []string {
 		"timezone",
 		"price_range",
 		"data_id",
+		"street_view_url",
 		"images",
 		"reservations",
 		"order_online",
@@ -218,6 +223,7 @@ func (e *Entry) CsvRow() []string {
 		e.Timezone,
 		e.PriceRange,
 		e.DataID,
+		e.StreetViewURL,
 		stringify(e.Images),
 		stringify(e.Reservations),
 		stringify(e.OrderOnline),
@@ -357,6 +363,9 @@ func EntryFromJSON(raw []byte, reviewCountOnly ...bool) (entry Entry, err error)
 		}
 	}
 
+	// Extract Street View URL from images
+	entry.StreetViewURL = extractStreetViewURL(entry.Images)
+
 	entry.Reservations = getLinkSource(getLinkSourceParams{
 		arr:    getNthElementAndCast[[]any](darray, 46),
 		link:   []int{0},
@@ -745,6 +754,20 @@ func stringify(v any) string {
 	}
 }
 
+// extractStreetViewURL finds the Street View image and extracts the panoid to create a proper URL
+func extractStreetViewURL(images []Image) string {
+	for _, img := range images {
+		if strings.Contains(img.Title, "Street View") {
+			matches := panoidRegex.FindStringSubmatch(img.Image)
+			if len(matches) > 1 {
+				return fmt.Sprintf("https://www.google.com/maps/@?api=1&map_action=pano&pano=%s", matches[1])
+			}
+		}
+	}
+
+	return ""
+}
+
 func decodeURL(url string) (string, error) {
 	quoted := `"` + strings.ReplaceAll(url, `"`, `\"`) + `"`