Начальный

1 files changed, 84 insertions, 0 deletions

diff --git a/pkg/model/place.go b/pkg/model/place.go
new file mode 100644
index 0000000..54ce038
--- /dev/null
+++ b/pkg/model/place.go
@@ -0,0 +1,84 @@
+package model
+
+import (
+	"database/sql/driver"
+	"fmt"
+	"math"
+	"regexp"
+	"strconv"
+	"time"
+
+	"github.com/uptrace/bun"
+)
+
+type Place struct {
+	bun.BaseModel `bun:"table:places,alias:p"`
+
+	GUID      string `bun:",pk,unique"`
+	Position  *Point `bun:"type:geometry(Point, 4326)"`
+	Img       string
+	Name      string
+	Count     int
+	CreatedAt time.Time `bun:",nullzero,notnull,default:current_timestamp"`
+	UpdatedAt time.Time `bun:",nullzero,notnull,default:current_timestamp"`
+	DeletedAt time.Time `bun:",soft_delete,nullzero"`
+}
+
+type Point struct {
+	Lat float64
+	Lon float64
+}
+
+func (p *Point) Value() (driver.Value, error) {
+	return fmt.Sprintf(`SRID=4326;POINT(%f %f)`, p.Lon, p.Lat), nil
+}
+
+func (p *Point) Scan(src any) (err error) {
+	re := regexp.MustCompile(`/\((.+?) (.+?)\)/`)
+	s := ""
+	//nolint:revive
+	switch src := src.(type) {
+	case string:
+		s = src
+	case []uint8:
+		s = string(src)
+	default:
+		return fmt.Errorf("unsupported data type: %T", src)
+	}
+	//nolint:gomnd
+	subs := re.FindAllString(s, 2)
+
+	lon, err := strconv.ParseFloat(subs[0], 64)
+	if err != nil {
+		return err
+	}
+
+	lat, err := strconv.ParseFloat(subs[1], 64)
+	if err != nil {
+		return err
+	}
+
+	p.Lat = lat
+	p.Lon = lon
+
+	return nil
+}
+
+const radius = 6371 // Earth's mean radius in kilometers
+
+func degrees2radians(degrees float64) float64 {
+	return degrees * math.Pi / 180
+}
+
+func (p *Point) Distance(destination *Point) float64 {
+	degreesLat := degrees2radians(destination.Lat - p.Lat)
+	degreesLong := degrees2radians(destination.Lon - p.Lon)
+	a := (math.Sin(degreesLat/2)*math.Sin(degreesLat/2) +
+		math.Cos(degrees2radians(p.Lat))*
+			math.Cos(degrees2radians(destination.Lat))*math.Sin(degreesLong/2)*
+			math.Sin(degreesLong/2))
+	c := 2 * math.Atan2(math.Sqrt(a), math.Sqrt(1-a))
+	d := radius * c
+
+	return d
+}