Prayer Service (Islam) (#214)

* checkpoint

* add fixes

* fix timezone parsing

* update

* fix error

prayer/handler/prayer.go

@@ -0,0 +1,115 @@
+package handler
+
+import (
+	"context"
+	"fmt"
+	"time"
+
+	"github.com/hablullah/go-prayer"
+	"github.com/micro/micro/v3/service/client"
+	"github.com/micro/micro/v3/service/errors"
+	geocode "github.com/micro/services/geocoding/proto"
+	pb "github.com/micro/services/prayer/proto"
+	timepb "github.com/micro/services/time/proto"
+)
+
+type Prayer struct{
+	Geocode geocode.GeocodingService
+	Time timepb.TimeService
+}
+
+func New(c client.Client) *Prayer {
+	return &Prayer{
+		Geocode: geocode.NewGeocodingService("geocoding", c),
+		Time:    timepb.NewTimeService("time", c),
+	}
+}
+
+func (p *Prayer) Times(ctx context.Context, req *pb.TimesRequest, rsp *pb.TimesResponse) error {
+	// geocode the location
+	if len(req.Location) == 0 && req.Latitude == 0.0 && req.Longitude == 0.0 {
+		return errors.BadRequest("prayer.times", "missing location")
+	}
+
+	latitude := req.Latitude
+	longitude := req.Longitude
+
+	// get lat/lng if location is specified
+	if len(req.Location) > 0 {
+		resp, err := p.Geocode.Lookup(ctx, &geocode.LookupRequest{
+			Address: req.Location,
+		})
+		if err != nil {
+			return errors.InternalServerError("prayer.times", "failed to lookup location")
+		}
+		latitude = resp.Location.Latitude
+		longitude = resp.Location.Longitude
+	}
+
+	if latitude == 0.0 && longitude == 0.0 {
+		return errors.BadRequest("prayer.times", "missing location")
+	}
+
+	// get the timezone
+	resp, err := p.Time.Zone(ctx, &timepb.ZoneRequest{
+		Location: fmt.Sprintf("%v,%v", latitude, longitude),
+	})
+	if err != nil {
+		return errors.InternalServerError("prayer.times", "failed to lookup timezone")
+	}
+
+	cfg := prayer.Config{
+		Latitude:          latitude,
+		Longitude:         longitude,
+		CalculationMethod: prayer.Kemenag,
+		AsrConvention:     prayer.Shafii,
+		PreciseToSeconds:  false,
+	}
+
+	// current date
+	date := time.Now()
+
+	// if date is specified then change it
+	if len(req.Date) > 0 {
+		d, err := time.Parse("2006-01-02", req.Date)
+		if err == nil {
+			date = d
+		}
+	}
+
+	if req.Days == 0 {
+		req.Days = 1
+	}
+
+	// set time zone
+	zone, _ := time.LoadLocation(resp.Timezone)
+	date = date.In(zone)
+
+	rsp.Date = date.Format("2006-01-02")
+	rsp.Days = req.Days
+	rsp.Location = req.Location
+	rsp.Latitude = latitude
+	rsp.Longitude = longitude
+
+	for i := 0; i < int(req.Days); i++ {
+		times, err := prayer.Calculate(cfg, date)
+		if err != nil {
+			return errors.InternalServerError("prayer.times", "failed to retrieve prayer times")
+		}
+
+		rsp.Times = append(rsp.Times, &pb.PrayerTime{
+			Date:    date.Format("2006-01-02"),
+			Fajr:    times.Fajr.Format("15:04"),
+			Sunrise: times.Sunrise.Format("15:04"),
+			Zuhr:    times.Zuhr.Format("15:04"),
+			Asr:     times.Asr.Format("15:04"),
+			Maghrib: times.Maghrib.Format("15:04"),
+			Isha:    times.Isha.Format("15:04"),
+		})
+
+		// add a day
+		date = date.AddDate(0, 0, 1)
+	}
+
+	return nil
+}