package middleware

import (
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/gin-gonic/gin"
	"github.com/nexuscrm/shared/pkg/constants"
)

func TestPerfTimingFromEnvDisabledByDefault(t *testing.T) {
	t.Setenv(perfTimingHeaderEnabledEnv, "")

	if got := PerfTimingFromEnv(); got != nil {
		t.Fatal("PerfTimingFromEnv() = handler, want nil when disabled")
	}
}

func TestPerfTimingHeaderSetsContextFlag(t *testing.T) {
	gin.SetMode(gin.TestMode)

	router := gin.New()
	var seen bool
	router.Use(NewPerfTimingHeader())
	router.GET("/probe", func(c *gin.Context) {
		seen, _ = c.Request.Context().Value(constants.ContextKeyPerfTiming).(bool)
		c.Status(http.StatusNoContent)
	})

	req := httptest.NewRequest(http.MethodGet, "/probe", nil)
	req.Header.Set(perfTimingHeaderName, "true")
	w := httptest.NewRecorder()

	router.ServeHTTP(w, req)

	if w.Code != http.StatusNoContent {
		t.Fatalf("status = %d, want %d", w.Code, http.StatusNoContent)
	}
	if !seen {
		t.Fatal("perf timing context flag was not set")
	}
}

func TestPerfTimingHeaderMissingLeavesContextUnchanged(t *testing.T) {
	gin.SetMode(gin.TestMode)

	router := gin.New()
	var seen bool
	router.Use(NewPerfTimingHeader())
	router.GET("/probe", func(c *gin.Context) {
		seen, _ = c.Request.Context().Value(constants.ContextKeyPerfTiming).(bool)
		c.Status(http.StatusNoContent)
	})

	req := httptest.NewRequest(http.MethodGet, "/probe", nil)
	w := httptest.NewRecorder()

	router.ServeHTTP(w, req)

	if w.Code != http.StatusNoContent {
		t.Fatalf("status = %d, want %d", w.Code, http.StatusNoContent)
	}
	if seen {
		t.Fatal("perf timing context flag was set without header")
	}
}