geocoding added, but working so-so, need to fix some lines

internal/handler/server_impl.go

@@ -7,6 +7,8 @@ import (
 	"fmt"
 	"log/slog"
 	"net/http"
+	neturl "net/url"
+	"strconv"
 	"time"
 
 	"github.com/anxi0uz/logiflow/internal/api"
@@ -28,16 +30,16 @@ const (
 	tokenKey     ctxKey = "Authorization"
 
 	// response messages
-	MsgInternalError   = "Internal server error"
-	MsgInvalidBody     = "Invalid request body"
-	MsgNotFound        = "Not found"
-	MsgUnauthorized    = "Unauthorized"
-	MsgMissingToken    = "Missing token"
-	MsgForbidden       = "Forbidden"
+	MsgInternalError = "Internal server error"
+	MsgInvalidBody   = "Invalid request body"
+	MsgNotFound      = "Not found"
+	MsgUnauthorized  = "Unauthorized"
+	MsgMissingToken  = "Missing token"
+	MsgForbidden     = "Forbidden"
 
 	// response types
-	RespError   = "error"
-	RespSuccess = "success"
+	RespError    = "error"
+	RespSuccess  = "success"
 	RespNotFound = "not found"
 )
 
@@ -234,3 +236,36 @@ func (s *Server) validateAccessToken(ctx context.Context, tokenStr string) (*Cla
 
 	return claims, nil
 }
+func (s *Server) geocode(ctx context.Context, address string) (lat, lon float64, err error) {
+	url := fmt.Sprintf(
+		"https://nominatim.openstreetmap.org/search?q=%s&format=json&limit=1",
+		neturl.QueryEscape(address),
+	)
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, nil)
+	if err != nil {
+		return 0, 0, err
+	}
+	req.Header.Set("User-Agent", "logiflow/1.0")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return 0, 0, err
+	}
+	defer resp.Body.Close()
+
+	var results []struct {
+		Lat string `json:"lat"`
+		Lon string `json:"lon"`
+	}
+	if err := json.NewDecoder(resp.Body).Decode(&results); err != nil {
+		return 0, 0, err
+	}
+	if len(results) == 0 {
+		return 0, 0, fmt.Errorf("address not found: %s", address)
+	}
+
+	lat, _ = strconv.ParseFloat(results[0].Lat, 64)
+	lon, _ = strconv.ParseFloat(results[0].Lon, 64)
+	return lat, lon, nil
+}