package middleware

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

	"github.com/gin-gonic/gin"

	"github.com/user-management-system/internal/config"
)

func TestCORS_UsesConfiguredOrigins(t *testing.T) {
	gin.SetMode(gin.TestMode)
	SetCORSConfig(config.CORSConfig{
		AllowedOrigins:   []string{"https://app.example.com"},
		AllowCredentials: true,
	})
	t.Cleanup(func() {
		SetCORSConfig(config.CORSConfig{
			AllowedOrigins:   []string{"*"},
			AllowCredentials: true,
		})
	})

	recorder := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(recorder)
	c.Request = httptest.NewRequest(http.MethodOptions, "/api/v1/users", nil)
	c.Request.Header.Set("Origin", "https://app.example.com")
	c.Request.Header.Set("Access-Control-Request-Headers", "Authorization")

	CORS()(c)

	if recorder.Code != http.StatusNoContent {
		t.Fatalf("expected 204, got %d", recorder.Code)
	}
	if got := recorder.Header().Get("Access-Control-Allow-Origin"); got != "https://app.example.com" {
		t.Fatalf("unexpected allow origin: %s", got)
	}
	if got := recorder.Header().Get("Access-Control-Allow-Credentials"); got != "true" {
		t.Fatalf("expected credentials header to be 'true', got %q", got)
	}
}

func TestSanitizeQuery_MasksSensitiveValues(t *testing.T) {
	raw := "token=abc123&foo=bar&access_token=xyz&secret=s1"
	sanitized := sanitizeQuery(raw)

	if sanitized == "" {
		t.Fatal("expected sanitized query")
	}
	if sanitized == raw {
		t.Fatal("expected query to be sanitized")
	}
	for _, value := range []string{"abc123", "xyz", "s1"} {
		if strings.Contains(sanitized, value) {
			t.Fatalf("expected sensitive value %q to be masked in %q", value, sanitized)
		}
	}
	if sanitizeQuery("") != "" {
		t.Fatal("expected empty query to stay empty")
	}
}

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

	recorder := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(recorder)
	c.Request = httptest.NewRequest(http.MethodGet, "/api/v1/users", nil)

	SecurityHeaders()(c)

	if got := recorder.Header().Get("X-Content-Type-Options"); got != "nosniff" {
		t.Fatalf("unexpected nosniff header: %q", got)
	}
	if got := recorder.Header().Get("X-Frame-Options"); got != "DENY" {
		t.Fatalf("unexpected frame options: %q", got)
	}
	if got := recorder.Header().Get("Content-Security-Policy"); got == "" {
		t.Fatal("expected content security policy header")
	}
	if got := recorder.Header().Get("Strict-Transport-Security"); got != "" {
		t.Fatalf("did not expect hsts header for http request, got %q", got)
	}
}

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

	recorder := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(recorder)
	c.Request = httptest.NewRequest(http.MethodGet, "/api/v1/users", nil)
	c.Request.Header.Set("X-Forwarded-Proto", "https")

	SecurityHeaders()(c)

	if got := recorder.Header().Get("Strict-Transport-Security"); !strings.Contains(got, "max-age=31536000") {
		t.Fatalf("expected hsts header, got %q", got)
	}
}

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

	recorder := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(recorder)
	c.Request = httptest.NewRequest(http.MethodGet, "/api/v1/auth/capabilities", nil)

	NoStoreSensitiveResponses()(c)

	if got := recorder.Header().Get("Cache-Control"); got != sensitiveNoStoreCacheControl {
		t.Fatalf("unexpected cache-control header: %q", got)
	}
	if got := recorder.Header().Get("Pragma"); got != "no-cache" {
		t.Fatalf("unexpected pragma header: %q", got)
	}
	if got := recorder.Header().Get("Expires"); got != "0" {
		t.Fatalf("unexpected expires header: %q", got)
	}
	if got := recorder.Header().Get("Surrogate-Control"); got != "no-store" {
		t.Fatalf("unexpected surrogate-control header: %q", got)
	}
}

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

	recorder := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(recorder)
	c.Request = httptest.NewRequest(http.MethodGet, "/api/v1/users", nil)

	NoStoreSensitiveResponses()(c)

	if got := recorder.Header().Get("Cache-Control"); got != "" {
		t.Fatalf("did not expect cache-control header, got %q", got)
	}
}