package integrationtests_test

import (
	"bytes"
	"context"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	v0 "github.com/modelcontextprotocol/registry/internal/api/handlers/v0"
	"github.com/modelcontextprotocol/registry/internal/auth"
	"github.com/modelcontextprotocol/registry/internal/model"
	"github.com/modelcontextprotocol/registry/internal/service"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

// MockAuthService implements a simple auth service for testing
type MockAuthService struct{}

func (m *MockAuthService) StartAuthFlow(
	_ context.Context, _ model.AuthMethod, _ string,
) (map[string]string, string, error) {
	return map[string]string{
		"device_code":      "mock_device_code",
		"user_code":        "ABCD-1234",
		"verification_uri": "https://github.com/login/device",
	}, "mock_status_token", nil
}

func (m *MockAuthService) CheckAuthStatus(_ context.Context, statusToken string) (string, error) {
	if statusToken == "mock_status_token" {
		return "mock_access_token", nil
	}
	return "", fmt.Errorf("invalid status token")
}

func (m *MockAuthService) ValidateAuth(_ context.Context, authentication model.Authentication) (bool, error) {
	// Simple validation: for testing purposes, accept any non-empty token
	switch authentication.Method {
	case model.AuthMethodGitHub:
		return authentication.Token != "", nil
	case model.AuthMethodNone:
		return true, nil
	default:
		return false, auth.ErrUnsupportedAuthMethod
	}
}

// TestPublishIntegration tests the complete flow of publishing a server using the fake service
func TestPublishIntegration(t *testing.T) {
	// Setup fake service and auth service
	registryService := service.NewFakeRegistryService()
	authService := &MockAuthService{}

	// Create the publish handler
	handler := v0.PublishHandler(registryService, authService)

	t.Run("successful publish with GitHub auth", func(t *testing.T) {
		publishReq := model.PublishRequest{
			ServerDetail: model.ServerDetail{
				Server: model.Server{
					Name:        "io.github.testuser/test-mcp-server",
					Description: "A test MCP server for integration testing",
					Repository: model.Repository{
						URL:    "https://github.com/testuser/test-mcp-server",
						Source: "github",
						ID:     "testuser/test-mcp-server",
					},
					VersionDetail: model.VersionDetail{
						Version: "1.0.0",
					},
				},
				Packages: []model.Package{
					{
						RegistryName: "npm",
						Name:         "test-mcp-server",
						Version:      "1.0.0",
						RunTimeHint:  "node",
						RuntimeArguments: []model.Argument{
							{
								Type: model.ArgumentTypeNamed,
								Name: "config",
								InputWithVariables: model.InputWithVariables{
									Input: model.Input{
										Description: "Configuration file path",
										Format:      model.FormatFilePath,
										IsRequired:  true,
									},
								},
							},
						},
					},
				},
				Remotes: []model.Remote{
					{
						TransportType: "http",
						URL:           "http://localhost:3000/mcp",
					},
				},
			},
		}

		// Marshal the server detail to JSON
		jsonData, err := json.Marshal(publishReq)
		require.NoError(t, err)

		// Create a request
		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_test_token_123")

		// Create a response recorder
		recorder := httptest.NewRecorder()

		// Call the handler
		handler(recorder, req)

		// Check the response
		assert.Equal(t, http.StatusCreated, recorder.Code)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)

		assert.Equal(t, "Server publication successful", response["message"])
		assert.NotEmpty(t, response["id"], "Server ID should be generated")

		// Verify the server was actually published by retrieving it
		publishedServer, err := registryService.GetByID(response["id"])
		require.NoError(t, err)
		assert.Equal(t, publishReq.ServerDetail.Name, publishedServer.Name)
		assert.Equal(t, publishReq.ServerDetail.Description, publishedServer.Description)
		assert.Equal(t, publishReq.ServerDetail.VersionDetail.Version, publishedServer.VersionDetail.Version)
		assert.Len(t, publishedServer.Packages, 1)
		assert.Len(t, publishedServer.Remotes, 1)
	})

	t.Run("successful publish without auth (no prefix)", func(t *testing.T) {
		publishReq := &model.PublishRequest{
			ServerDetail: model.ServerDetail{
				Server: model.Server{
					Name:        "custom-mcp-server",
					Description: "A custom MCP server without auth",
					Repository: model.Repository{
						URL:    "https://example.com/custom-server",
						Source: "custom",
						ID:     "custom/custom-server",
					},
					VersionDetail: model.VersionDetail{
						Version: "2.0.0",
					},
				},
			},
		}

		jsonData, err := json.Marshal(publishReq)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "dummy_token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusCreated, recorder.Code)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)

		assert.Equal(t, "Server publication successful", response["message"])
		assert.NotEmpty(t, response["id"], "Server ID should be generated")
	})

	t.Run("publish fails with missing name", func(t *testing.T) {
		publishReq := &model.PublishRequest{
			ServerDetail: model.ServerDetail{
				Server: model.Server{
					Name:        "", // Missing name
					Description: "A test server",
					VersionDetail: model.VersionDetail{
						Version: "1.0.0",
					},
				},
			},
		}

		jsonData, err := json.Marshal(publishReq)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusBadRequest, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Name is required")
	})

	t.Run("publish fails with missing version", func(t *testing.T) {
		serverDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "test-server",
				Description: "A test server",
				VersionDetail: model.VersionDetail{
					Version: "", // Missing version
				},
			},
		}

		jsonData, err := json.Marshal(serverDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusBadRequest, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Version is required")
	})

	t.Run("publish fails with missing authorization header", func(t *testing.T) {
		serverDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "test-server",
				Description: "A test server",
				VersionDetail: model.VersionDetail{
					Version: "1.0.0",
				},
			},
		}

		jsonData, err := json.Marshal(serverDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		// No Authorization header

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusUnauthorized, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Authorization header is required")
	})

	t.Run("publish fails with invalid JSON", func(t *testing.T) {
		invalidJSON := `{"name": "test", "version": `

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBufferString(invalidJSON))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusBadRequest, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Invalid")
	})

	t.Run("publish fails with unsupported HTTP method", func(t *testing.T) {
		req := httptest.NewRequest(http.MethodGet, "/v0/publish", nil)
		req.Header.Set("Authorization", "Bearer token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusMethodNotAllowed, recorder.Code)
		assert.Contains(t, recorder.Body.String(), "Method not allowed")
	})

	t.Run("publish fails with duplicate name and version", func(t *testing.T) {
		// First, publish a server successfully
		firstServerDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.duplicate/test-server",
				Description: "First server for duplicate test",
				Repository: model.Repository{
					URL:    "https://github.com/duplicate/test-server",
					Source: "github",
					ID:     "duplicate/test-server",
				},
				VersionDetail: model.VersionDetail{
					Version: "1.0.0",
				},
			},
		}

		jsonData, err := json.Marshal(firstServerDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_token_first")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)

		assert.Equal(t, http.StatusCreated, recorder.Code, "First publish should succeed")

		firstServerDetail.ID = response["id"] // Store the ID for later verification

		// Now try to publish another server with the same name and version
		duplicateServerDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.duplicate/test-server", // Same name
				Description: "Duplicate server attempt",
				Repository: model.Repository{
					URL:    "https://github.com/duplicate/test-server-fork",
					Source: "github",
					ID:     "duplicate/test-server-fork",
				},
				VersionDetail: model.VersionDetail{
					Version: "1.0.0", // Same version
				},
			},
		}

		duplicateJSONData, err := json.Marshal(duplicateServerDetail)
		require.NoError(t, err)

		duplicateReq := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(duplicateJSONData))
		duplicateReq.Header.Set("Content-Type", "application/json")
		duplicateReq.Header.Set("Authorization", "Bearer github_token_duplicate")

		duplicateRecorder := httptest.NewRecorder()
		handler(duplicateRecorder, duplicateReq)

		// The duplicate should fail
		assert.Equal(t, http.StatusBadRequest, duplicateRecorder.Code)
		assert.Contains(t, duplicateRecorder.Body.String(), "Failed to publish server details")

		// Verify that only the first server was actually stored
		retrievedServer, err := registryService.GetByID(firstServerDetail.ID)
		require.NoError(t, err)
		assert.Equal(t, firstServerDetail.Name, retrievedServer.Name)
		assert.Equal(t, firstServerDetail.Description, retrievedServer.Description)
	})

	t.Run("publish succeeds with same name but different version", func(t *testing.T) {
		// Publish first version
		firstVersionDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.versioned/test-server",
				Description: "First version of the server",
				Repository: model.Repository{
					URL:    "https://github.com/versioned/test-server",
					Source: "github",
					ID:     "versioned/test-server",
				},
				VersionDetail: model.VersionDetail{
					Version: "1.0.0",
				},
			},
		}

		jsonData, err := json.Marshal(firstVersionDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_token_v1")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)
		firstVersionDetail.ID = response["id"] // Store the ID for later verification

		assert.Equal(t, http.StatusCreated, recorder.Code, "First version should succeed")
		require.NotEmpty(t, firstVersionDetail.ID, "Server ID should be generated")

		// Publish second version with same name but different version
		secondVersionDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.versioned/test-server", // Same name
				Description: "Second version of the server",
				Repository: model.Repository{
					URL:    "https://github.com/versioned/test-server",
					Source: "github",
					ID:     "versioned/test-server",
				},
				VersionDetail: model.VersionDetail{
					Version: "2.0.0", // Different version
				},
			},
		}

		secondJSONData, err := json.Marshal(secondVersionDetail)
		require.NoError(t, err)

		secondReq := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(secondJSONData))
		secondReq.Header.Set("Content-Type", "application/json")
		secondReq.Header.Set("Authorization", "Bearer github_token_v2")

		secondRecorder := httptest.NewRecorder()
		handler(secondRecorder, secondReq)

		var secondResponse map[string]string
		err = json.Unmarshal(secondRecorder.Body.Bytes(), &secondResponse)
		require.NoError(t, err)
		secondVersionDetail.ID = secondResponse["id"] // Store the ID for later verification

		// The second version should succeed
		assert.Equal(t, http.StatusCreated, secondRecorder.Code)
		require.NotEmpty(t, secondVersionDetail.ID, "Server ID for second version should be generated")

		// Verify both versions exist
		firstRetrieved, err := registryService.GetByID(firstVersionDetail.ID)
		require.NoError(t, err)
		assert.Equal(t, "1.0.0", firstRetrieved.VersionDetail.Version)

		secondRetrieved, err := registryService.GetByID(secondVersionDetail.ID)
		require.NoError(t, err)
		assert.Equal(t, "2.0.0", secondRetrieved.VersionDetail.Version)
	})

	t.Run("publish fails when trying to publish older version after newer version", func(t *testing.T) {
		// First, publish a newer version (2.0.0)
		newerVersionDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.versioning/version-order-test",
				Description: "Newer version published first",
				Repository: model.Repository{
					URL:    "https://github.com/versioning/version-order-test",
					Source: "github",
					ID:     "versioning/version-order-test",
				},
				VersionDetail: model.VersionDetail{
					Version: "2.0.0",
				},
			},
		}

		jsonData, err := json.Marshal(newerVersionDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_token_newer")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)
		newerVersionDetail.ID = response["id"] // Store the ID for later verification

		assert.Equal(t, http.StatusCreated, recorder.Code, "Newer version should be published successfully")
		require.NotEmpty(t, newerVersionDetail.ID, "Server ID for newer version should be generated")

		// Now try to publish an older version (1.0.0) of the same package
		olderVersionDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.versioning/version-order-test", // Same name
				Description: "Older version published after newer",
				Repository: model.Repository{
					URL:    "https://github.com/versioning/version-order-test",
					Source: "github",
					ID:     "versioning/version-order-test",
				},
				VersionDetail: model.VersionDetail{
					Version: "1.0.0", // Older version
				},
			},
		}

		olderJSONData, err := json.Marshal(olderVersionDetail)
		require.NoError(t, err)

		olderReq := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(olderJSONData))
		olderReq.Header.Set("Content-Type", "application/json")
		olderReq.Header.Set("Authorization", "Bearer github_token_older")

		olderRecorder := httptest.NewRecorder()
		handler(olderRecorder, olderReq)

		// This should fail - we shouldn't allow publishing older versions after newer ones
		assert.Equal(t, http.StatusBadRequest, olderRecorder.Code, "Publishing older version should fail")
		assert.Contains(t, olderRecorder.Body.String(), "version", "Error message should mention version")

		// Verify that only the newer version exists
		newerRetrieved, err := registryService.GetByID(newerVersionDetail.ID)
		require.NoError(t, err)
		assert.Equal(t, "2.0.0", newerRetrieved.VersionDetail.Version)

		// Verify the older version was not stored
		_, err = registryService.GetByID(olderVersionDetail.ID)
		assert.Error(t, err, "Older version should not have been stored")
	})
}

// TestPublishIntegrationWithComplexPackages tests publishing with complex package configurations
func TestPublishIntegrationWithComplexPackages(t *testing.T) {
	registryService := service.NewFakeRegistryService()
	authService := &MockAuthService{}
	handler := v0.PublishHandler(registryService, authService)

	t.Run("publish with complex package configuration", func(t *testing.T) {
		serverDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.complex/advanced-mcp-server",
				Description: "An advanced MCP server with complex configuration",
				Repository: model.Repository{
					URL:    "https://github.com/complex/advanced-mcp-server",
					Source: "github",
					ID:     "complex/advanced-mcp-server",
				},
				VersionDetail: model.VersionDetail{
					Version: "2.1.0",
				},
			},
			Packages: []model.Package{
				{
					RegistryName: "npm",
					Name:         "@example/advanced-mcp-server",
					Version:      "43.1.0",
					RunTimeHint:  "node",
					RuntimeArguments: []model.Argument{
						{
							Type: model.ArgumentTypeNamed,
							Name: "experimental-modules",
						},
						{
							Type: model.ArgumentTypeNamed,
							Name: "config",
							InputWithVariables: model.InputWithVariables{
								Input: model.Input{
									Description: "Main configuration file",
									Format:      model.FormatFilePath,
									IsRequired:  true,
									Default:     "./config.json",
								},
							},
						},
						{
							Type: model.ArgumentTypePositional,
							Name: "mode",
							InputWithVariables: model.InputWithVariables{
								Input: model.Input{
									Description: "Operation mode",
									Format:      model.FormatString,
									IsRequired:  false,
									Default:     "production",
									Choices:     []string{"development", "staging", "production"},
								},
							},
						},
					},
					PackageArguments: []model.Argument{
						{
							Type: model.ArgumentTypeNamed,
							Name: "install-deps",
							InputWithVariables: model.InputWithVariables{
								Input: model.Input{
									Description: "Install dependencies",
									Format:      model.FormatBoolean,
									Default:     "true",
								},
							},
						},
					},
					EnvironmentVariables: []model.KeyValueInput{
						{
							Name: "LOG_LEVEL",
							InputWithVariables: model.InputWithVariables{
								Input: model.Input{
									Description: "Logging level",
									Format:      model.FormatString,
									Default:     "info",
									Choices:     []string{"debug", "info", "warn", "error"},
								},
							},
						},
						{
							Name: "API_KEY",
							InputWithVariables: model.InputWithVariables{
								Input: model.Input{
									Description: "API key for external service",
									Format:      model.FormatString,
									IsRequired:  true,
									IsSecret:    true,
								},
							},
						},
					},
				},
			},
			Remotes: []model.Remote{
				{
					TransportType: "http",
					URL:           "http://localhost:8080/mcp",
					Headers: []model.Input{
						{
							Description: "API Version Header",
							Format:      model.FormatString,
							Value:       "v1",
						},
					},
				},
			},
		}

		jsonData, err := json.Marshal(serverDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_complex_token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		assert.Equal(t, http.StatusCreated, recorder.Code)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)

		serverDetail.ID = response["id"] // Store the ID for later verification
		assert.Equal(t, "Server publication successful", response["message"])
		assert.NotEmpty(t, response["id"], "Server ID should be generated")

		// Verify the complex server was published correctly
		publishedServer, err := registryService.GetByID(serverDetail.ID)
		require.NoError(t, err)

		// Verify package details
		require.Len(t, publishedServer.Packages, 1)
		pkg := publishedServer.Packages[0]
		assert.Equal(t, "npm", pkg.RegistryName)
		assert.Equal(t, "@example/advanced-mcp-server", pkg.Name)
		assert.Len(t, pkg.RuntimeArguments, 3)
		assert.Len(t, pkg.PackageArguments, 1)
		assert.Len(t, pkg.EnvironmentVariables, 2)

		// Verify remotes
		require.Len(t, publishedServer.Remotes, 1)
		assert.Equal(t, "http", publishedServer.Remotes[0].TransportType)
		assert.Len(t, publishedServer.Remotes[0].Headers, 1)
	})
}

// TestPublishIntegrationEndToEnd tests the complete end-to-end flow
func TestPublishIntegrationEndToEnd(t *testing.T) {
	registryService := service.NewFakeRegistryService()
	authService := &MockAuthService{}
	handler := v0.PublishHandler(registryService, authService)

	t.Run("end-to-end publish and retrieve flow", func(t *testing.T) {
		// Step 1: Get initial count of servers
		initialServers, _, err := registryService.List("", 100)
		require.NoError(t, err)
		initialCount := len(initialServers)

		// Step 2: Publish a new server
		serverDetail := &model.ServerDetail{
			Server: model.Server{
				Name:        "io.github.e2e/end-to-end-server",
				Description: "End-to-end test server",
				Repository: model.Repository{
					URL:    "https://github.com/e2e/end-to-end-server",
					Source: "github",
					ID:     "e2e/end-to-end-server",
				},
				VersionDetail: model.VersionDetail{
					Version: "1.0.0",
				},
			},
		}

		jsonData, err := json.Marshal(serverDetail)
		require.NoError(t, err)

		req := httptest.NewRequest(http.MethodPost, "/v0/publish", bytes.NewBuffer(jsonData))
		req.Header.Set("Content-Type", "application/json")
		req.Header.Set("Authorization", "Bearer github_e2e_token")

		recorder := httptest.NewRecorder()
		handler(recorder, req)

		var response map[string]string
		err = json.Unmarshal(recorder.Body.Bytes(), &response)
		require.NoError(t, err)
		serverDetail.ID = response["id"] // Store the ID for later verification

		require.Equal(t, http.StatusCreated, recorder.Code)

		// Step 3: Verify the count increased
		updatedServers, _, err := registryService.List("", 100)
		require.NoError(t, err)
		assert.Equal(t, initialCount+1, len(updatedServers))

		// Step 4: Verify the server can be retrieved by ID
		retrievedServer, err := registryService.GetByID(serverDetail.ID)
		require.NoError(t, err)
		assert.Equal(t, serverDetail.Name, retrievedServer.Name)
		assert.Equal(t, serverDetail.Description, retrievedServer.Description)

		// Step 5: Verify the server appears in the list
		found := false
		for _, server := range updatedServers {
			if server.ID == serverDetail.ID {
				found = true
				assert.Equal(t, serverDetail.Name, server.Name)
				break
			}
		}
		assert.True(t, found, "Published server should appear in the list")
	})
}