package httptransport_test

import (
	"encoding/json"
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"go.opentelemetry.io/otel/trace/noop"

	"switchbot-api/internal/app/observability"
	"switchbot-api/internal/domain/health"
	"switchbot-api/internal/domain/hello"
	httptransport "switchbot-api/internal/transport/http"
	"switchbot-api/internal/transport/http/handlers"
)

func TestHealthz(t *testing.T) {
	router := newTestRouter()

	req := httptest.NewRequest(http.MethodGet, "/healthz", nil)
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}

	var body map[string]string
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}
	if body["status"] != "ok" {
		t.Fatalf("expected status=ok, got %q", body["status"])
	}
}

func TestHello(t *testing.T) {
	router := newTestRouter()

	req := httptest.NewRequest(http.MethodGet, "/hello", nil)
	rec := httptest.NewRecorder()
	router.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("expected status %d, got %d", http.StatusOK, rec.Code)
	}

	var body map[string]string
	if err := json.Unmarshal(rec.Body.Bytes(), &body); err != nil {
		t.Fatalf("failed to unmarshal response: %v", err)
	}
	if body["message"] != "hello world" {
		t.Fatalf("expected message=hello world, got %q", body["message"])
	}
}

func newTestRouter() *gin.Engine {
	gin.SetMode(gin.TestMode)

	logger := slog.New(slog.NewJSONHandler(io.Discard, nil))
	registry := observability.NewRegistry()

	httpMetrics := observability.NewHTTPMetrics(registry)
	healthHandler := handlers.NewHealthHandler(health.NewReadinessUsecase(nil))
	helloHandler := handlers.NewHelloHandler(hello.NewService())

	return httptransport.NewRouter(httptransport.Dependencies{
		Logger:            logger,
		Tracer:            noop.NewTracerProvider().Tracer("test"),
		HTTPMetrics:       httpMetrics,
		PrometheusHandler: observability.NewPrometheusHandler(registry),
		HealthHandler:     healthHandler,
		HelloHandler:      helloHandler,
	})
}