//                           _       _
// __      _____  __ ___   ___  __ _| |_ ___
// \ \ /\ / / _ \/ _` \ \ / / |/ _` | __/ _ \
//  \ V  V /  __/ (_| |\ V /| | (_| | ||  __/
//   \_/\_/ \___|\__,_| \_/ |_|\__,_|\__\___|
//
//  Copyright © 2016 - 2024 Weaviate B.V. All rights reserved.
//
//  CONTACT: hello@weaviate.io
//

package clients

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

	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/sirupsen/logrus/hooks/test"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
	"github.com/weaviate/weaviate/modules/text2vec-aws/ent"
)

func TestClient(t *testing.T) {
	t.Run("when all is fine", func(t *testing.T) {
		t.Skip("Skipping this test for now")
		server := httptest.NewServer(&fakeHandler{t: t})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "access_key",
			awsSecret:    "secret",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		expected := &ent.VectorizationResult{
			Text:       "This is my text",
			Vector:     []float32{0.1, 0.2, 0.3},
			Dimensions: 3,
		}
		res, err := c.Vectorize(context.Background(), []string{"This is my text"},
			ent.VectorizationConfig{
				Service: "bedrock",
				Region:  "region",
				Model:   "model",
			})

		assert.Nil(t, err)
		assert.Equal(t, expected, res)
	})

	t.Run("when all is fine - Sagemaker", func(t *testing.T) {
		server := httptest.NewServer(&fakeHandler{t: t})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "access_key",
			awsSecret:    "secret",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		expected := &ent.VectorizationResult{
			Text:       "This is my text",
			Vector:     []float32{0.1, 0.2, 0.3},
			Dimensions: 3,
		}
		res, err := c.Vectorize(context.Background(), []string{"This is my text"},
			ent.VectorizationConfig{
				Service:  "sagemaker",
				Region:   "region",
				Endpoint: "endpoint",
			})

		assert.Nil(t, err)
		assert.Equal(t, expected, res)
	})

	t.Run("when the server returns an error", func(t *testing.T) {
		t.Skip("Skipping this test for now")
		server := httptest.NewServer(&fakeHandler{
			t:           t,
			serverError: errors.Errorf("nope, not gonna happen"),
		})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "access_key",
			awsSecret:    "secret",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		_, err := c.Vectorize(context.Background(), []string{"This is my text"},
			ent.VectorizationConfig{
				Service: "bedrock",
			})

		require.NotNil(t, err)
		assert.EqualError(t, err, "connection to AWS failed with status: 500 error: nope, not gonna happen")
	})

	t.Run("when AWS key is passed using X-Aws-Api-Key header", func(t *testing.T) {
		t.Skip("Skipping this test for now")
		server := httptest.NewServer(&fakeHandler{t: t})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "access_key",
			awsSecret:    "secret",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		ctxWithValue := context.WithValue(context.Background(),
			"X-Aws-Api-Key", []string{"some-key"})

		expected := &ent.VectorizationResult{
			Text:       "This is my text",
			Vector:     []float32{0.1, 0.2, 0.3},
			Dimensions: 3,
		}
		res, err := c.Vectorize(ctxWithValue, []string{"This is my text"}, ent.VectorizationConfig{
			Service: "bedrock",
		})

		require.Nil(t, err)
		assert.Equal(t, expected, res)
	})

	t.Run("when X-Aws-Access-Key header is passed but empty", func(t *testing.T) {
		t.Skip("Skipping this test for now")
		server := httptest.NewServer(&fakeHandler{t: t})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "",
			awsSecret:    "123",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		ctxWithValue := context.WithValue(context.Background(),
			"X-Aws-Api-Key", []string{""})

		_, err := c.Vectorize(ctxWithValue, []string{"This is my text"}, ent.VectorizationConfig{
			Service: "bedrock",
		})

		require.NotNil(t, err)
		assert.Equal(t, err.Error(), "AWS Access Key: no access key found neither in request header: "+
			"X-Aws-Access-Key nor in environment variable under AWS_ACCESS_KEY_ID")
	})

	t.Run("when X-Aws-Secret-Key header is passed but empty", func(t *testing.T) {
		t.Skip("Skipping this test for now")
		server := httptest.NewServer(&fakeHandler{t: t})
		defer server.Close()
		c := &aws{
			httpClient:   &http.Client{},
			logger:       nullLogger(),
			awsAccessKey: "123",
			awsSecret:    "",
			buildBedrockUrlFn: func(service, region, model string) string {
				return server.URL
			},
			buildSagemakerUrlFn: func(service, region, endpoint string) string {
				return server.URL
			},
		}
		ctxWithValue := context.WithValue(context.Background(),
			"X-Aws-Api-Key", []string{""})

		_, err := c.Vectorize(ctxWithValue, []string{"This is my text"}, ent.VectorizationConfig{
			Service: "bedrock",
		})

		require.NotNil(t, err)
		assert.Equal(t, err.Error(), "AWS Secret Key: no secret found neither in request header: "+
			"X-Aws-Access-Secret nor in environment variable under AWS_SECRET_ACCESS_KEY")
	})
}

func TestBuildBedrockUrl(t *testing.T) {
	service := "bedrock"
	region := "us-east-1"
	t.Run("when using a Cohere", func(t *testing.T) {
		model := "cohere.embed-english-v3"

		expected := "https://bedrock-runtime.us-east-1.amazonaws.com/model/cohere.embed-english-v3/invoke"
		result := buildBedrockUrl(service, region, model)

		if result != expected {
			t.Errorf("Expected %s but got %s", expected, result)
		}
	})

	t.Run("When using an AWS model", func(t *testing.T) {
		model := "amazon.titan-e1t-medium"

		expected := "https://bedrock.us-east-1.amazonaws.com/model/amazon.titan-e1t-medium/invoke"
		result := buildBedrockUrl(service, region, model)

		if result != expected {
			t.Errorf("Expected %s but got %s", expected, result)
		}
	})
}

func TestCreateRequestBody(t *testing.T) {
	input := []string{"Hello, world!"}

	t.Run("Create request for Amazon embedding model", func(t *testing.T) {
		model := "amazon.titan-e1t-medium"
		req, _ := createRequestBody(model, input, vectorizeObject)
		_, ok := req.(bedrockEmbeddingsRequest)
		if !ok {
			t.Fatalf("Expected req to be a bedrockEmbeddingsRequest, got %T", req)
		}
	})

	t.Run("Create request for Cohere embedding model", func(t *testing.T) {
		model := "cohere.embed-english-v3"
		req, _ := createRequestBody(model, input, vectorizeObject)
		_, ok := req.(bedrockCohereEmbeddingRequest)
		if !ok {
			t.Fatalf("Expected req to be a bedrockCohereEmbeddingRequest, got %T", req)
		}
	})

	t.Run("Create request for unknown embedding model", func(t *testing.T) {
		model := "unknown.model"
		_, err := createRequestBody(model, input, vectorizeObject)
		if err == nil {
			t.Errorf("Expected an error for unknown model, got nil")
		}
	})
}

func TestVectorize(t *testing.T) {
	ctx := context.Background()
	input := []string{"Hello, world!"}

	t.Run("Vectorize using an Amazon model", func(t *testing.T) {
		t.Skip("Skipping because CI doesnt have the right credentials")
		config := ent.VectorizationConfig{
			Model:   "amazon.titan-e1t-medium",
			Service: "bedrock",
			Region:  "us-east-1",
		}

		awsAccessKeyID := os.Getenv("AWS_ACCESS_KEY_ID_AMAZON")
		awsSecretAccessKey := os.Getenv("AWS_SECRET_ACCESS_KEY_AMAZON")

		aws := New(awsAccessKeyID, awsSecretAccessKey, 60*time.Second, nil)

		_, err := aws.Vectorize(ctx, input, config)
		if err != nil {
			t.Errorf("Vectorize returned an error: %v", err)
		}
	})

	t.Run("Vectorize using a Cohere model", func(t *testing.T) {
		t.Skip("Skipping because CI doesnt have the right credentials")
		config := ent.VectorizationConfig{
			Model:   "cohere.embed-english-v3",
			Service: "bedrock",
			Region:  "us-east-1",
		}

		awsAccessKeyID := os.Getenv("AWS_ACCESS_KEY_ID_COHERE")
		awsSecretAccessKey := os.Getenv("AWS_SECRET_ACCESS_KEY_COHERE")

		aws := New(awsAccessKeyID, awsSecretAccessKey, 60*time.Second, nil)

		_, err := aws.Vectorize(ctx, input, config)
		if err != nil {
			t.Errorf("Vectorize returned an error: %v", err)
		}
	})
}

func TestExtractHostAndPath(t *testing.T) {
	t.Run("valid URL", func(t *testing.T) {
		endpointUrl := "https://service.region.amazonaws.com/model/model-name/invoke"
		expectedHost := "service.region.amazonaws.com"
		expectedPath := "/model/model-name/invoke"

		host, path, err := extractHostAndPath(endpointUrl)
		if err != nil {
			t.Errorf("Unexpected error: %v", err)
		}
		if host != expectedHost {
			t.Errorf("Expected host %s but got %s", expectedHost, host)
		}
		if path != expectedPath {
			t.Errorf("Expected path %s but got %s", expectedPath, path)
		}
	})

	t.Run("URL without host or path", func(t *testing.T) {
		endpointUrl := "https://"

		_, _, err := extractHostAndPath(endpointUrl)

		if err == nil {
			t.Error("Expected error but got nil")
		}
	})
}

type fakeHandler struct {
	t           *testing.T
	serverError error
}

func (f *fakeHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	assert.Equal(f.t, http.MethodPost, r.Method)

	authHeader := r.Header["Authorization"][0]
	if f.serverError != nil {
		var outBytes []byte
		var err error

		if strings.Contains(authHeader, "bedrock") {
			embeddingResponse := &bedrockEmbeddingResponse{
				Message: ptString(f.serverError.Error()),
			}
			outBytes, err = json.Marshal(embeddingResponse)
		} else {
			embeddingResponse := &sagemakerEmbeddingResponse{
				Message: ptString(f.serverError.Error()),
			}
			outBytes, err = json.Marshal(embeddingResponse)
		}

		require.Nil(f.t, err)

		w.WriteHeader(http.StatusInternalServerError)
		w.Write(outBytes)
		return
	}

	bodyBytes, err := io.ReadAll(r.Body)
	require.Nil(f.t, err)
	defer r.Body.Close()

	var outBytes []byte
	if strings.Contains(authHeader, "bedrock") {
		var req bedrockEmbeddingsRequest
		require.Nil(f.t, json.Unmarshal(bodyBytes, &req))

		textInput := req.InputText
		assert.Greater(f.t, len(textInput), 0)
		embeddingResponse := &bedrockEmbeddingResponse{
			Embedding: []float32{0.1, 0.2, 0.3},
		}
		outBytes, err = json.Marshal(embeddingResponse)
	} else {
		var req sagemakerEmbeddingsRequest
		require.Nil(f.t, json.Unmarshal(bodyBytes, &req))

		textInputs := req.TextInputs
		assert.Greater(f.t, len(textInputs), 0)
		embeddingResponse := &sagemakerEmbeddingResponse{
			Embedding: [][]float32{{0.1, 0.2, 0.3}},
		}
		outBytes, err = json.Marshal(embeddingResponse)
	}

	require.Nil(f.t, err)

	w.Write(outBytes)
}

func nullLogger() logrus.FieldLogger {
	l, _ := test.NewNullLogger()
	return l
}

func ptString(in string) *string {
	return &in
}