impl zip.Get for translating zip to info and calc dist

zip/zip.go

@@ -0,0 +1,75 @@
+package zip
+
+import (
+	_ "embed"
+	"local/truckstop/logtr"
+	"math"
+	"strconv"
+	"strings"
+)
+
+//go:embed testdata/simplemaps_uszips_basicv1.79/uszips.csv
+var csv string
+
+type Zip struct {
+	Lat   float64
+	Lng   float64
+	City  string
+	State string
+}
+
+var zips map[string]Zip
+
+func init() {
+	zips = map[string]Zip{}
+	trim := func(s string) string {
+		return strings.Trim(s, `"`)
+	}
+	logtr.Infof("%d", len(csv))
+	for _, line := range strings.Split(csv, "\n")[1:] {
+		strs := strings.Split(line, ",")
+		if len(strs) < 5 {
+			continue
+		}
+		zip := trim(strs[0])
+		lat, _ := strconv.ParseFloat(trim(strs[1]), 32)
+		lng, _ := strconv.ParseFloat(trim(strs[2]), 32)
+		city := trim(strs[3])
+		state := trim(strs[4])
+		zips[zip] = Zip{
+			Lat:   lat,
+			Lng:   lng,
+			City:  city,
+			State: state,
+		}
+		logtr.Infof("%+v", zips[zip])
+	}
+	logtr.Infof("%+v to %+v = %v", Get("27006"), Get("84059"), Get("27006").MilesTo(Get("84059")))
+}
+
+func (zip Zip) MilesTo(other Zip) int {
+	// c**2 = a**2 + b**2
+	// 69.2 mi per lat
+	// 60.0 mi per lng
+	return int(math.Sqrt(
+		math.Pow(69.2*(math.Abs(zip.Lat)-math.Abs(other.Lat)), 2) +
+			math.Pow(60.0*(math.Abs(zip.Lng)-math.Abs(other.Lng)), 2),
+	))
+}
+
+func Get(zip string) Zip {
+	if z, ok := zips[zip]; ok {
+		return z
+	}
+	zipAsI, err := strconv.Atoi(strings.Split(zip, "-")[0])
+	if err != nil {
+		return Zip{}
+	}
+	for i := 0; i < 5; i++ {
+		j := i - 2
+		if z2, ok := zips[strconv.Itoa(zipAsI+j)]; ok {
+			return z2
+		}
+	}
+	return Zip{}
+}

zip/zip_test.go

@@ -0,0 +1,7 @@
+package zip
+
+import "testing"
+
+func TestZip(t *testing.T) {
+	_ = true
+}