package s3api

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

	"github.com/seaweedfs/seaweedfs/weed/s3api/s3_constants"
)

// TestPutObjectWithSSEC tests PUT object with SSE-C through HTTP handler
func TestPutObjectWithSSEC(t *testing.T) {
	keyPair := GenerateTestSSECKey(1)
	testData := "Hello, SSE-C PUT object!"

	// Create HTTP request
	req := CreateTestHTTPRequest("PUT", "/test-bucket/test-object", []byte(testData))
	SetupTestSSECHeaders(req, keyPair)
	SetupTestMuxVars(req, map[string]string{
		"bucket": "test-bucket",
		"object": "test-object",
	})

	// Create response recorder
	w := CreateTestHTTPResponse()

	// Test header validation
	err := ValidateSSECHeaders(req)
	if err != nil {
		t.Fatalf("Header validation failed: %v", err)
	}

	// Parse SSE-C headers
	customerKey, err := ParseSSECHeaders(req)
	if err != nil {
		t.Fatalf("Failed to parse SSE-C headers: %v", err)
	}

	if customerKey == nil {
		t.Fatal("Expected customer key, got nil")
	}

	// Verify parsed key matches input
	if !bytes.Equal(customerKey.Key, keyPair.Key) {
		t.Error("Parsed key doesn't match input key")
	}

	if customerKey.KeyMD5 != keyPair.KeyMD5 {
		t.Errorf("Parsed key MD5 doesn't match: expected %s, got %s", keyPair.KeyMD5, customerKey.KeyMD5)
	}

	// Simulate setting response headers
	w.Header().Set(s3_constants.AmzServerSideEncryptionCustomerAlgorithm, "AES256")
	w.Header().Set(s3_constants.AmzServerSideEncryptionCustomerKeyMD5, keyPair.KeyMD5)

	// Verify response headers
	AssertSSECHeaders(t, w, keyPair)
}

// TestGetObjectWithSSEC tests GET object with SSE-C through HTTP handler
func TestGetObjectWithSSEC(t *testing.T) {
	keyPair := GenerateTestSSECKey(1)

	// Create HTTP request for GET
	req := CreateTestHTTPRequest("GET", "/test-bucket/test-object", nil)
	SetupTestSSECHeaders(req, keyPair)
	SetupTestMuxVars(req, map[string]string{
		"bucket": "test-bucket",
		"object": "test-object",
	})

	// Create response recorder
	w := CreateTestHTTPResponse()

	// Test that SSE-C is detected for GET requests
	if !IsSSECRequest(req) {
		t.Error("Should detect SSE-C request for GET with SSE-C headers")
	}

	// Validate headers
	err := ValidateSSECHeaders(req)
	if err != nil {
		t.Fatalf("Header validation failed: %v", err)
	}

	// Simulate response with SSE-C headers
	w.Header().Set(s3_constants.AmzServerSideEncryptionCustomerAlgorithm, "AES256")
	w.Header().Set(s3_constants.AmzServerSideEncryptionCustomerKeyMD5, keyPair.KeyMD5)
	w.WriteHeader(http.StatusOK)

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

	AssertSSECHeaders(t, w, keyPair)
}

// TestPutObjectWithSSEKMS tests PUT object with SSE-KMS through HTTP handler
func TestPutObjectWithSSEKMS(t *testing.T) {
	kmsKey := SetupTestKMS(t)
	defer kmsKey.Cleanup()

	testData := "Hello, SSE-KMS PUT object!"

	// Create HTTP request
	req := CreateTestHTTPRequest("PUT", "/test-bucket/test-object", []byte(testData))
	SetupTestSSEKMSHeaders(req, kmsKey.KeyID)
	SetupTestMuxVars(req, map[string]string{
		"bucket": "test-bucket",
		"object": "test-object",
	})

	// Create response recorder
	w := CreateTestHTTPResponse()

	// Test that SSE-KMS is detected
	if !IsSSEKMSRequest(req) {
		t.Error("Should detect SSE-KMS request")
	}

	// Parse SSE-KMS headers
	sseKmsKey, err := ParseSSEKMSHeaders(req)
	if err != nil {
		t.Fatalf("Failed to parse SSE-KMS headers: %v", err)
	}

	if sseKmsKey == nil {
		t.Fatal("Expected SSE-KMS key, got nil")
	}

	if sseKmsKey.KeyID != kmsKey.KeyID {
		t.Errorf("Parsed key ID doesn't match: expected %s, got %s", kmsKey.KeyID, sseKmsKey.KeyID)
	}

	// Simulate setting response headers
	w.Header().Set(s3_constants.AmzServerSideEncryption, "aws:kms")
	w.Header().Set(s3_constants.AmzServerSideEncryptionAwsKmsKeyId, kmsKey.KeyID)

	// Verify response headers
	AssertSSEKMSHeaders(t, w, kmsKey.KeyID)
}

// TestGetObjectWithSSEKMS tests GET object with SSE-KMS through HTTP handler
func TestGetObjectWithSSEKMS(t *testing.T) {
	kmsKey := SetupTestKMS(t)
	defer kmsKey.Cleanup()

	// Create HTTP request for GET (no SSE headers needed for GET)
	req := CreateTestHTTPRequest("GET", "/test-bucket/test-object", nil)
	SetupTestMuxVars(req, map[string]string{
		"bucket": "test-bucket",
		"object": "test-object",
	})

	// Create response recorder
	w := CreateTestHTTPResponse()

	// Simulate response with SSE-KMS headers (would come from stored metadata)
	w.Header().Set(s3_constants.AmzServerSideEncryption, "aws:kms")
	w.Header().Set(s3_constants.AmzServerSideEncryptionAwsKmsKeyId, kmsKey.KeyID)
	w.WriteHeader(http.StatusOK)

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

	AssertSSEKMSHeaders(t, w, kmsKey.KeyID)
}

// TestSSECRangeRequestSupport tests that range requests are now supported for SSE-C
func TestSSECRangeRequestSupport(t *testing.T) {
	keyPair := GenerateTestSSECKey(1)

	// Create HTTP request with Range header
	req := CreateTestHTTPRequest("GET", "/test-bucket/test-object", nil)
	req.Header.Set("Range", "bytes=0-100")
	SetupTestSSECHeaders(req, keyPair)
	SetupTestMuxVars(req, map[string]string{
		"bucket": "test-bucket",
		"object": "test-object",
	})

	// Create a mock proxy response with SSE-C headers
	proxyResponse := httptest.NewRecorder()
	proxyResponse.Header().Set(s3_constants.AmzServerSideEncryptionCustomerAlgorithm, "AES256")
	proxyResponse.Header().Set(s3_constants.AmzServerSideEncryptionCustomerKeyMD5, keyPair.KeyMD5)
	proxyResponse.Header().Set("Content-Length", "1000")

	// Test the detection logic - these should all still work

	// Should detect as SSE-C request
	if !IsSSECRequest(req) {
		t.Error("Should detect SSE-C request")
	}

	// Should detect range request
	if req.Header.Get("Range") == "" {
		t.Error("Range header should be present")
	}

	// The combination should now be allowed and handled by the filer layer
	// Range requests with SSE-C are now supported since IV is stored in metadata
}

// TestSSEHeaderConflicts tests conflicting SSE headers
func TestSSEHeaderConflicts(t *testing.T) {
	testCases := []struct {
		name    string
		setupFn func(*http.Request)
		valid   bool
	}{
		{
			name: "SSE-C and SSE-KMS conflict",
			setupFn: func(req *http.Request) {
				keyPair := GenerateTestSSECKey(1)
				SetupTestSSECHeaders(req, keyPair)
				SetupTestSSEKMSHeaders(req, "test-key-id")
			},
			valid: false,
		},
		{
			name: "Valid SSE-C only",
			setupFn: func(req *http.Request) {
				keyPair := GenerateTestSSECKey(1)
				SetupTestSSECHeaders(req, keyPair)
			},
			valid: true,
		},
		{
			name: "Valid SSE-KMS only",
			setupFn: func(req *http.Request) {
				SetupTestSSEKMSHeaders(req, "test-key-id")
			},
			valid: true,
		},
		{
			name: "No SSE headers",
			setupFn: func(req *http.Request) {
				// No SSE headers
			},
			valid: true,
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			req := CreateTestHTTPRequest("PUT", "/test-bucket/test-object", []byte("test"))
			tc.setupFn(req)

			ssecDetected := IsSSECRequest(req)
			sseKmsDetected := IsSSEKMSRequest(req)

			// Both shouldn't be detected simultaneously
			if ssecDetected && sseKmsDetected {
				t.Error("Both SSE-C and SSE-KMS should not be detected simultaneously")
			}

			// Test validation if SSE-C is detected
			if ssecDetected {
				err := ValidateSSECHeaders(req)
				if tc.valid && err != nil {
					t.Errorf("Expected valid SSE-C headers, got error: %v", err)
				}
				if !tc.valid && err == nil && tc.name == "SSE-C and SSE-KMS conflict" {
					// This specific test case should probably be handled at a higher level
					t.Log("Conflict detection should be handled by higher-level validation")
				}
			}
		})
	}
}

// TestSSECopySourceHeaders tests copy operations with SSE headers
func TestSSECopySourceHeaders(t *testing.T) {
	sourceKey := GenerateTestSSECKey(1)
	destKey := GenerateTestSSECKey(2)

	// Create copy request with both source and destination SSE-C headers
	req := CreateTestHTTPRequest("PUT", "/dest-bucket/dest-object", nil)

	// Set copy source headers
	SetupTestSSECCopyHeaders(req, sourceKey)

	// Set destination headers
	SetupTestSSECHeaders(req, destKey)

	// Set copy source
	req.Header.Set("X-Amz-Copy-Source", "/source-bucket/source-object")

	SetupTestMuxVars(req, map[string]string{
		"bucket": "dest-bucket",
		"object": "dest-object",
	})

	// Parse copy source headers
	copySourceKey, err := ParseSSECCopySourceHeaders(req)
	if err != nil {
		t.Fatalf("Failed to parse copy source headers: %v", err)
	}

	if copySourceKey == nil {
		t.Fatal("Expected copy source key, got nil")
	}

	if !bytes.Equal(copySourceKey.Key, sourceKey.Key) {
		t.Error("Copy source key doesn't match")
	}

	// Parse destination headers
	destCustomerKey, err := ParseSSECHeaders(req)
	if err != nil {
		t.Fatalf("Failed to parse destination headers: %v", err)
	}

	if destCustomerKey == nil {
		t.Fatal("Expected destination key, got nil")
	}

	if !bytes.Equal(destCustomerKey.Key, destKey.Key) {
		t.Error("Destination key doesn't match")
	}
}

// TestSSERequestValidation tests comprehensive request validation
func TestSSERequestValidation(t *testing.T) {
	testCases := []struct {
		name        string
		method      string
		setupFn     func(*http.Request)
		expectError bool
		errorType   string
	}{
		{
			name:   "Valid PUT with SSE-C",
			method: "PUT",
			setupFn: func(req *http.Request) {
				keyPair := GenerateTestSSECKey(1)
				SetupTestSSECHeaders(req, keyPair)
			},
			expectError: false,
		},
		{
			name:   "Valid GET with SSE-C",
			method: "GET",
			setupFn: func(req *http.Request) {
				keyPair := GenerateTestSSECKey(1)
				SetupTestSSECHeaders(req, keyPair)
			},
			expectError: false,
		},
		{
			name:   "Invalid SSE-C key format",
			method: "PUT",
			setupFn: func(req *http.Request) {
				req.Header.Set(s3_constants.AmzServerSideEncryptionCustomerAlgorithm, "AES256")
				req.Header.Set(s3_constants.AmzServerSideEncryptionCustomerKey, "invalid-key")
				req.Header.Set(s3_constants.AmzServerSideEncryptionCustomerKeyMD5, "invalid-md5")
			},
			expectError: true,
			errorType:   "InvalidRequest",
		},
		{
			name:   "Missing SSE-C key MD5",
			method: "PUT",
			setupFn: func(req *http.Request) {
				keyPair := GenerateTestSSECKey(1)
				req.Header.Set(s3_constants.AmzServerSideEncryptionCustomerAlgorithm, "AES256")
				req.Header.Set(s3_constants.AmzServerSideEncryptionCustomerKey, keyPair.KeyB64)
				// Missing MD5
			},
			expectError: true,
			errorType:   "InvalidRequest",
		},
	}

	for _, tc := range testCases {
		t.Run(tc.name, func(t *testing.T) {
			req := CreateTestHTTPRequest(tc.method, "/test-bucket/test-object", []byte("test data"))
			tc.setupFn(req)

			SetupTestMuxVars(req, map[string]string{
				"bucket": "test-bucket",
				"object": "test-object",
			})

			// Test header validation
			if IsSSECRequest(req) {
				err := ValidateSSECHeaders(req)
				if tc.expectError && err == nil {
					t.Errorf("Expected error for %s, but got none", tc.name)
				}
				if !tc.expectError && err != nil {
					t.Errorf("Expected no error for %s, but got: %v", tc.name, err)
				}
			}
		})
	}
}