package middleware

import (
	"context"
	"encoding/json"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"
	"time"

	"github.com/rede5/gohorsejobs/backend/internal/utils"
)

func TestLoggingMiddleware(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := LoggingMiddleware(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Errorf("Expected status 200, got %d", rr.Code)
	}
}

func TestAuthMiddleware_Success(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		claims, ok := r.Context().Value(UserKey).(*utils.Claims)
		if !ok {
			t.Error("Claims not found in context")
			w.WriteHeader(http.StatusUnauthorized)
			return
		}
		if claims.UserID != 1 {
			t.Errorf("Expected userID 1, got %d", claims.UserID)
		}
		w.WriteHeader(http.StatusOK)
	})

	mw := AuthMiddleware(handler)

	token, _ := utils.GenerateJWT(1, "test-user", "user")
	req := httptest.NewRequest("GET", "/test", nil)
	req.Header.Set("Authorization", "Bearer "+token)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusOK {
		t.Errorf("Expected status 200, got %d", rr.Code)
	}
}

func TestRateLimiter_isAllowed(t *testing.T) {
	limiter := NewRateLimiter(3, time.Minute)

	// First 3 requests should be allowed
	for i := 0; i < 3; i++ {
		if !limiter.isAllowed("192.168.1.1") {
			t.Errorf("Request %d should be allowed", i+1)
		}
	}

	// 4th request should be denied
	if limiter.isAllowed("192.168.1.1") {
		t.Error("Request 4 should be denied")
	}

	// Different IP should still be allowed
	if !limiter.isAllowed("192.168.1.2") {
		t.Error("Different IP should be allowed")
	}
}

func TestRateLimitMiddleware(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := RateLimitMiddleware(2, time.Minute)(handler)

	// Create test requests
	for i := 0; i < 3; i++ {
		req := httptest.NewRequest("GET", "/test", nil)
		req.RemoteAddr = "192.168.1.100:12345"
		rr := httptest.NewRecorder()

		mw.ServeHTTP(rr, req)

		if i < 2 {
			if rr.Code != http.StatusOK {
				t.Errorf("Request %d: expected status 200, got %d", i+1, rr.Code)
			}
		} else {
			if rr.Code != http.StatusTooManyRequests {
				t.Errorf("Request %d: expected status 429, got %d", i+1, rr.Code)
			}
		}
	}
}

func TestSecurityHeadersMiddleware(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := SecurityHeadersMiddleware(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	expectedHeaders := map[string]string{
		"X-Frame-Options":        "DENY",
		"X-Content-Type-Options": "nosniff",
		"X-XSS-Protection":       "1; mode=block",
	}

	for header, expected := range expectedHeaders {
		actual := rr.Header().Get(header)
		if actual != expected {
			t.Errorf("Header %s: expected %q, got %q", header, expected, actual)
		}
	}
}

func TestAuthMiddleware_NoAuthHeader(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := AuthMiddleware(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusUnauthorized {
		t.Errorf("Expected status 401, got %d", rr.Code)
	}
}

func TestAuthMiddleware_InvalidFormat(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := AuthMiddleware(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	req.Header.Set("Authorization", "InvalidFormat")
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusUnauthorized {
		t.Errorf("Expected status 401, got %d", rr.Code)
	}
}

func TestAuthMiddleware_InvalidToken(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := AuthMiddleware(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	req.Header.Set("Authorization", "Bearer invalid.token.here")
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusUnauthorized {
		t.Errorf("Expected status 401, got %d", rr.Code)
	}
}

func TestRequireRole_NoClaims(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := RequireRole("admin")(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Code != http.StatusUnauthorized {
		t.Errorf("Expected status 401, got %d", rr.Code)
	}
}

func TestCORSMiddleware(t *testing.T) {
	os.Setenv("CORS_ORIGINS", "http://allowed.com,http://another.com")
	defer os.Unsetenv("CORS_ORIGINS")

	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := CORSMiddleware(handler)

	// Test allowed origin
	req := httptest.NewRequest("OPTIONS", "/test", nil)
	req.Header.Set("Origin", "http://allowed.com")
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Header().Get("Access-Control-Allow-Origin") != "http://allowed.com" {
		t.Errorf("Expected allow origin http://allowed.com, got %s", rr.Header().Get("Access-Control-Allow-Origin"))
	}

	// Test disallowed origin
	req = httptest.NewRequest("OPTIONS", "/test", nil)
	req.Header.Set("Origin", "http://hacker.com")
	rr = httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	if rr.Header().Get("Access-Control-Allow-Origin") != "" {
		t.Errorf("Expected empty allow origin, got %s", rr.Header().Get("Access-Control-Allow-Origin"))
	}
}

func TestSanitizeMiddleware(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		// Read body to verify sanitization
		var body map[string]interface{}
		json.NewDecoder(r.Body).Decode(&body)
		w.Header().Set("X-Sanitized-Name", body["name"].(string))
		w.WriteHeader(http.StatusOK)
	})

	mw := SanitizeMiddleware(handler)

	jsonBody := `{"name": "<script>alert('xss')</script>"}`
	req := httptest.NewRequest("POST", "/test", strings.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	expected := "&lt;script&gt;alert(&#39;xss&#39;)&lt;/script&gt;"
	if rr.Header().Get("X-Sanitized-Name") != expected {
		t.Errorf("Expected sanitized name %s, got %s", expected, rr.Header().Get("X-Sanitized-Name"))
	}
}

func TestRequireRole_Success(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := RequireRole("admin")(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	// Inject claims into context manually to simulate authenticated user
	claims := &utils.Claims{
		UserID: 1,
		Role:   "admin",
	}
	ctx := context.WithValue(req.Context(), UserKey, claims)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req.WithContext(ctx))

	if rr.Code != http.StatusOK {
		t.Errorf("Expected status 200, got %d", rr.Code)
	}
}

func TestRequireRole_Forbidden(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := RequireRole("admin")(handler)

	req := httptest.NewRequest("GET", "/test", nil)
	claims := &utils.Claims{
		UserID: 1,
		Role:   "user", // Wrong role
	}
	ctx := context.WithValue(req.Context(), UserKey, claims)
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req.WithContext(ctx))

	if rr.Code != http.StatusForbidden {
		t.Errorf("Expected status 403, got %d", rr.Code)
	}
}

func TestSanitizeMiddleware_InvalidJSON(t *testing.T) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusOK)
	})

	mw := SanitizeMiddleware(handler)

	jsonBody := `{"name": "broken json`
	req := httptest.NewRequest("POST", "/test", strings.NewReader(jsonBody))
	req.Header.Set("Content-Type", "application/json")
	rr := httptest.NewRecorder()

	mw.ServeHTTP(rr, req)

	// Should pass through if JSON invalid (or handle gracefully)
	if rr.Code != http.StatusOK {
		t.Errorf("Expected status 200 (pass through), got %d", rr.Code)
	}
}