Initial MVP commit

internal/adapters/httpapi/server.go

@@ -0,0 +1,110 @@
+package httpapi
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"time"
+
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/alerts"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/forecasts"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/observations"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/platform/timeparse"
+)
+
+type ObservationService interface {
+	GetCurrent(ctx context.Context) (observations.CurrentResponse, error)
+}
+
+type ForecastService interface {
+	GetByTimestamp(ctx context.Context, ts time.Time) (forecasts.Response, error)
+}
+
+type AlertService interface {
+	GetCurrent(ctx context.Context) (alerts.Response, error)
+}
+
+type Server struct {
+	obsSvc    ObservationService
+	fcSvc     ForecastService
+	alertsSvc AlertService
+}
+
+func NewServer(obsSvc ObservationService, fcSvc ForecastService, alertsSvc AlertService) *Server {
+	return &Server{obsSvc: obsSvc, fcSvc: fcSvc, alertsSvc: alertsSvc}
+}
+
+func (s *Server) Handler() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/observations/current", s.handleObservationsCurrent)
+	mux.HandleFunc("/forecast", s.handleForecast)
+	mux.HandleFunc("/alerts/current", s.handleAlertsCurrent)
+	return mux
+}
+
+func (s *Server) handleObservationsCurrent(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "only GET is supported")
+		return
+	}
+
+	resp, err := s.obsSvc.GetCurrent(r.Context())
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal_error", "failed to fetch current observations")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+func (s *Server) handleForecast(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "only GET is supported")
+		return
+	}
+
+	raw := r.URL.Query().Get("timestamp")
+	ts, err := timeparse.ParseTimestamp(raw)
+	if err != nil {
+		writeError(w, http.StatusBadRequest, "invalid_request", err.Error())
+		return
+	}
+
+	resp, err := s.fcSvc.GetByTimestamp(r.Context(), ts)
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal_error", "failed to fetch forecast")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+func (s *Server) handleAlertsCurrent(w http.ResponseWriter, r *http.Request) {
+	if r.Method != http.MethodGet {
+		writeError(w, http.StatusMethodNotAllowed, "method_not_allowed", "only GET is supported")
+		return
+	}
+
+	resp, err := s.alertsSvc.GetCurrent(r.Context())
+	if err != nil {
+		writeError(w, http.StatusInternalServerError, "internal_error", "failed to fetch current alerts")
+		return
+	}
+
+	writeJSON(w, http.StatusOK, resp)
+}
+
+type errorResponse struct {
+	Code    string `json:"code"`
+	Message string `json:"message"`
+}
+
+func writeError(w http.ResponseWriter, status int, code, message string) {
+	writeJSON(w, status, errorResponse{Code: code, Message: message})
+}
+
+func writeJSON(w http.ResponseWriter, status int, payload any) {
+	w.Header().Set("Content-Type", "application/json")
+	w.WriteHeader(status)
+	_ = json.NewEncoder(w).Encode(payload)
+}

internal/adapters/httpapi/server_test.go

@@ -0,0 +1,234 @@
+package httpapi
+
+import (
+	"context"
+	"encoding/json"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+	"time"
+
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/alerts"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/forecasts"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/observations"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/application/units"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/core/ports"
+	"gitea.maximumdirect.net/ejr/weatherapi/internal/platform/constants"
+)
+
+type fakeObservationRepo struct {
+	summary       ports.ObservationSummaryMetric
+	conditions    []ports.ObservationConditionMetric
+	precip        []string
+	summaryWin    time.Duration
+	conditionsWin time.Duration
+	precipWin     time.Duration
+}
+
+func (f *fakeObservationRepo) GetCurrentSummary(_ context.Context, window time.Duration) (ports.ObservationSummaryMetric, error) {
+	f.summaryWin = window
+	return f.summary, nil
+}
+
+func (f *fakeObservationRepo) ListCurrentConditions(_ context.Context, window time.Duration) ([]ports.ObservationConditionMetric, error) {
+	f.conditionsWin = window
+	return f.conditions, nil
+}
+
+func (f *fakeObservationRepo) ListCurrentPrecipitationEvents(_ context.Context, window time.Duration) ([]string, error) {
+	f.precipWin = window
+	return f.precip, nil
+}
+
+type fakeForecastRepo struct {
+	periods  []ports.ForecastPeriodMetric
+	gotTS    time.Time
+	gotLimit int
+}
+
+func (f *fakeForecastRepo) ListForecastPeriodsAt(_ context.Context, ts time.Time, limit int) ([]ports.ForecastPeriodMetric, error) {
+	f.gotTS = ts
+	f.gotLimit = limit
+	return f.periods, nil
+}
+
+type fakeAlertRepo struct{}
+
+func (fakeAlertRepo) ListCurrentAlerts(context.Context) ([]ports.AlertRecord, error) {
+	return nil, nil
+}
+
+func TestForecastInvalidTimestampReturns400(t *testing.T) {
+	fcRepo := &fakeForecastRepo{}
+	obsRepo := &fakeObservationRepo{}
+
+	server := NewServer(
+		observations.NewService(obsRepo, units.USConverter{}, constants.ObservationWindow),
+		forecasts.NewService(fcRepo, units.USConverter{}, constants.ForecastQueryLimit),
+		alerts.NewService(fakeAlertRepo{}),
+	).Handler()
+
+	req := httptest.NewRequest(http.MethodGet, "/forecast?timestamp=bad-time", nil)
+	w := httptest.NewRecorder()
+	server.ServeHTTP(w, req)
+
+	if w.Code != http.StatusBadRequest {
+		t.Fatalf("expected 400, got %d", w.Code)
+	}
+
+	var payload map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+	if payload["code"] != "invalid_request" {
+		t.Fatalf("expected invalid_request code, got %v", payload["code"])
+	}
+}
+
+func TestObservationsCurrentReturnsUSUnits(t *testing.T) {
+	summaryTemp := 20.0
+	summaryAppTemp := 15.0
+	condTemp := 10.0
+	station := "KSTL"
+	text := "Cloudy"
+	providerText := "OVC"
+	conditionText := "Cloudy"
+
+	obsRepo := &fakeObservationRepo{
+		summary: ports.ObservationSummaryMetric{
+			TemperatureC:         &summaryTemp,
+			ApparentTemperatureC: &summaryAppTemp,
+		},
+		conditions: []ports.ObservationConditionMetric{
+			{
+				StationID:              &station,
+				ObservedAt:             time.Date(2026, 3, 17, 12, 0, 0, 0, time.UTC),
+				TemperatureC:           &condTemp,
+				TextDescription:        &text,
+				ProviderRawDescription: &providerText,
+				ConditionText:          &conditionText,
+			},
+		},
+		precip: []string{"rain"},
+	}
+
+	fcRepo := &fakeForecastRepo{}
+	server := NewServer(
+		observations.NewService(obsRepo, units.USConverter{}, constants.ObservationWindow),
+		forecasts.NewService(fcRepo, units.USConverter{}, constants.ForecastQueryLimit),
+		alerts.NewService(fakeAlertRepo{}),
+	).Handler()
+
+	req := httptest.NewRequest(http.MethodGet, "/observations/current", nil)
+	w := httptest.NewRecorder()
+	server.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+
+	var payload map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+
+	summary := payload["summary"].(map[string]any)
+	if got := summary["temperatureF"].(float64); got != 68.0 {
+		t.Fatalf("expected summary temperatureF=68.0, got %v", got)
+	}
+	if got := summary["apparentTemperatureF"].(float64); got != 59.0 {
+		t.Fatalf("expected summary apparentTemperatureF=59.0, got %v", got)
+	}
+	if _, exists := summary["temperatureC"]; exists {
+		t.Fatalf("did not expect metric key temperatureC in US response")
+	}
+
+	conditions := payload["conditions"].([]any)
+	first := conditions[0].(map[string]any)
+	if got := first["temperatureF"].(float64); got != 50.0 {
+		t.Fatalf("expected conditions[0].temperatureF=50.0, got %v", got)
+	}
+
+	if obsRepo.summaryWin != constants.ObservationWindow || obsRepo.conditionsWin != constants.ObservationWindow || obsRepo.precipWin != constants.ObservationWindow {
+		t.Fatalf("expected observation window %s to be used", constants.ObservationWindow)
+	}
+}
+
+func TestForecastReturnsUSUnits(t *testing.T) {
+	tempC := 0.0
+	tempMinC := -1.0
+	tempMaxC := 1.0
+	appTempC := -2.0
+	windKmh := 10.0
+	gustKmh := 16.09344
+	name := "Now"
+
+	fcRepo := &fakeForecastRepo{
+		periods: []ports.ForecastPeriodMetric{
+			{
+				PeriodIndex:          1,
+				StartTime:            time.Date(2026, 3, 17, 12, 0, 0, 0, time.UTC),
+				EndTime:              time.Date(2026, 3, 17, 13, 0, 0, 0, time.UTC),
+				Name:                 &name,
+				ConditionCode:        1,
+				TemperatureC:         &tempC,
+				TemperatureCMin:      &tempMinC,
+				TemperatureCMax:      &tempMaxC,
+				ApparentTemperatureC: &appTempC,
+				WindSpeedKmh:         &windKmh,
+				WindGustKmh:          &gustKmh,
+			},
+		},
+	}
+
+	obsRepo := &fakeObservationRepo{}
+	server := NewServer(
+		observations.NewService(obsRepo, units.USConverter{}, constants.ObservationWindow),
+		forecasts.NewService(fcRepo, units.USConverter{}, constants.ForecastQueryLimit),
+		alerts.NewService(fakeAlertRepo{}),
+	).Handler()
+
+	req := httptest.NewRequest(http.MethodGet, "/forecast?timestamp=2026-03-17T12:30:00Z", nil)
+	w := httptest.NewRecorder()
+	server.ServeHTTP(w, req)
+
+	if w.Code != http.StatusOK {
+		t.Fatalf("expected 200, got %d", w.Code)
+	}
+
+	var payload map[string]any
+	if err := json.Unmarshal(w.Body.Bytes(), &payload); err != nil {
+		t.Fatalf("decode response: %v", err)
+	}
+
+	periods := payload["periods"].([]any)
+	first := periods[0].(map[string]any)
+	if got := first["temperatureF"].(float64); got != 32.0 {
+		t.Fatalf("expected temperatureF=32.0, got %v", got)
+	}
+	if got := first["temperatureFMin"].(float64); got != 30.2 {
+		t.Fatalf("expected temperatureFMin=30.2, got %v", got)
+	}
+	if got := first["temperatureFMax"].(float64); got != 33.8 {
+		t.Fatalf("expected temperatureFMax=33.8, got %v", got)
+	}
+	if got := first["apparentTemperatureF"].(float64); got != 28.4 {
+		t.Fatalf("expected apparentTemperatureF=28.4, got %v", got)
+	}
+	if got := first["windSpeedMph"].(float64); got != 6.2 {
+		t.Fatalf("expected windSpeedMph=6.2, got %v", got)
+	}
+	if got := first["windGustMph"].(float64); got != 10.0 {
+		t.Fatalf("expected windGustMph=10.0, got %v", got)
+	}
+	if _, exists := first["windSpeedKmh"]; exists {
+		t.Fatalf("did not expect metric key windSpeedKmh in US response")
+	}
+
+	if fcRepo.gotLimit != constants.ForecastQueryLimit {
+		t.Fatalf("expected forecast query limit %d, got %d", constants.ForecastQueryLimit, fcRepo.gotLimit)
+	}
+	if fcRepo.gotTS.IsZero() {
+		t.Fatalf("expected forecast timestamp passed to repo")
+	}
+}