/*
Copyright 2021 The Dapr Authors
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package http

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"net/http"
	"net/http/httptest"
	"sort"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/dapr/go-sdk/actor/api"
	"github.com/dapr/go-sdk/actor/mock"
	"github.com/dapr/go-sdk/service/common"
	"github.com/dapr/go-sdk/service/internal"
)

func testTopicFunc(ctx context.Context, e *common.TopicEvent) (retry bool, err error) {
	if e == nil {
		return false, errors.New("nil content")
	}
	if e.DataContentType != "application/json" {
		return false, fmt.Errorf("invalid content type: %s", e.DataContentType)
	}
	return false, nil
}

func testErrorTopicFunc(ctx context.Context, e *common.TopicEvent) (retry bool, err error) {
	return true, errors.New("error to cause a retry")
}

func TestEventNilHandler(t *testing.T) {
	s := newServer("", nil)
	sub := &common.Subscription{
		PubsubName: "messages",
		Topic:      "test",
		Route:      "/",
		Metadata:   map[string]string{},
	}
	err := s.AddTopicEventHandler(sub, nil)
	assert.Errorf(t, err, "expected error adding event handler")
}

func TestEventHandler(t *testing.T) {
	data := `{
		"specversion" : "1.0",
		"type" : "com.github.pull.create",
		"source" : "https://github.com/cloudevents/spec/pull",
		"subject" : "123",
		"id" : "A234-1234-1234",
		"time" : "2018-04-05T17:31:00Z",
		"comexampleextension1" : "value",
		"comexampleothervalue" : 5,
		"datacontenttype" : "application/json",
		"data" : "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
	}`

	s := newServer("", nil)

	sub := &common.Subscription{
		PubsubName: "messages",
		Topic:      "test",
		Route:      "/",
		Metadata:   map[string]string{},
	}
	err := s.AddTopicEventHandler(sub, testTopicFunc)
	assert.NoErrorf(t, err, "error adding event handler")

	sub2 := &common.Subscription{
		PubsubName: "messages",
		Topic:      "errors",
		Route:      "/errors",
		Metadata:   map[string]string{},
	}
	err = s.AddTopicEventHandler(sub2, testErrorTopicFunc)
	assert.NoErrorf(t, err, "error adding error event handler")

	sub3 := &common.Subscription{
		PubsubName: "messages",
		Topic:      "test",
		Route:      "/other",
		Match:      `event.type == "other"`,
		Priority:   1,
	}
	err = s.AddTopicEventHandler(sub3, testTopicFunc)
	assert.NoErrorf(t, err, "error adding error event handler")

	s.registerBaseHandler()

	req, err := http.NewRequest(http.MethodGet, "/dapr/subscribe", nil)
	require.NoErrorf(t, err, "error creating request: %s", data)
	req.Header.Set("Accept", "application/json")
	rr := httptest.NewRecorder()
	s.mux.ServeHTTP(rr, req)
	resp := rr.Result()
	defer resp.Body.Close()
	payload, err := io.ReadAll(resp.Body)
	require.NoErrorf(t, err, "error reading response")
	var subs []internal.TopicSubscription
	require.NoErrorf(t, json.Unmarshal(payload, &subs), "could not decode subscribe response")

	sort.Slice(subs, func(i, j int) bool {
		less := strings.Compare(subs[i].PubsubName, subs[j].PubsubName)
		if less != 0 {
			return less < 0
		}
		return strings.Compare(subs[i].Topic, subs[j].Topic) <= 0
	})

	if assert.Lenf(t, subs, 2, "unexpected subscription count") {
		assert.Equal(t, "messages", subs[0].PubsubName)
		assert.Equal(t, "errors", subs[0].Topic)

		assert.Equal(t, "messages", subs[1].PubsubName)
		assert.Equal(t, "test", subs[1].Topic)
		assert.Equal(t, "", subs[1].Route)
		assert.Equal(t, "/", subs[1].Routes.Default)
		if assert.Lenf(t, subs[1].Routes.Rules, 1, "unexpected rules count") {
			assert.Equal(t, `event.type == "other"`, subs[1].Routes.Rules[0].Match)
			assert.Equal(t, "/other", subs[1].Routes.Rules[0].Path)
		}
	}

	makeEventRequest(t, s, "/", data, http.StatusOK)
	makeEventRequest(t, s, "/", "", http.StatusSeeOther)
	makeEventRequest(t, s, "/", "not JSON", http.StatusSeeOther)
	makeEventRequest(t, s, "/errors", data, http.StatusOK)
}

func TestEventDataHandling(t *testing.T) {
	tests := map[string]struct {
		data   string
		result interface{}
	}{
		"JSON nested": {
			data: `{
				"specversion" : "1.0",
				"type" : "com.github.pull.create",
				"source" : "https://github.com/cloudevents/spec/pull",
				"subject" : "123",
				"id" : "A234-1234-1234",
				"time" : "2018-04-05T17:31:00Z",
				"comexampleextension1" : "value",
				"comexampleothervalue" : 5,
				"datacontenttype" : "application/json",
				"data" : {
					"message":"hello"
				}
			}`,
			result: map[string]interface{}{
				"message": "hello",
			},
		},
		"JSON base64 encoded in data": {
			data: `{
				"specversion" : "1.0",
				"type" : "com.github.pull.create",
				"source" : "https://github.com/cloudevents/spec/pull",
				"subject" : "123",
				"id" : "A234-1234-1234",
				"time" : "2018-04-05T17:31:00Z",
				"comexampleextension1" : "value",
				"comexampleothervalue" : 5,
				"datacontenttype" : "application/json",
				"data" : "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
			}`,
			result: map[string]interface{}{
				"message": "hello",
			},
		},
		"JSON base64 encoded in data_base64": {
			data: `{
				"specversion" : "1.0",
				"type" : "com.github.pull.create",
				"source" : "https://github.com/cloudevents/spec/pull",
				"subject" : "123",
				"id" : "A234-1234-1234",
				"time" : "2018-04-05T17:31:00Z",
				"comexampleextension1" : "value",
				"comexampleothervalue" : 5,
				"datacontenttype" : "application/json",
				"data_base64" : "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
			}`,
			result: map[string]interface{}{
				"message": "hello",
			},
		},
		"Binary base64 encoded in data_base64": {
			data: `{
				"specversion" : "1.0",
				"type" : "com.github.pull.create",
				"source" : "https://github.com/cloudevents/spec/pull",
				"subject" : "123",
				"id" : "A234-1234-1234",
				"time" : "2018-04-05T17:31:00Z",
				"comexampleextension1" : "value",
				"comexampleothervalue" : 5,
				"datacontenttype" : "application/octet-stream",
				"data_base64" : "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
			}`,
			result: []byte(`{"message":"hello"}`),
		},
		"JSON string escaped": {
			data: `{
				"specversion" : "1.0",
				"type" : "com.github.pull.create",
				"source" : "https://github.com/cloudevents/spec/pull",
				"subject" : "123",
				"id" : "A234-1234-1234",
				"time" : "2018-04-05T17:31:00Z",
				"comexampleextension1" : "value",
				"comexampleothervalue" : 5,
				"datacontenttype" : "application/json",
				"data" : "{\"message\":\"hello\"}"
			}`,
			result: map[string]interface{}{
				"message": "hello",
			},
		},
	}

	s := newServer("", nil)

	sub := &common.Subscription{
		PubsubName: "messages",
		Topic:      "test",
		Route:      "/test",
		Metadata:   map[string]string{},
	}

	recv := make(chan struct{}, 1)
	var topicEvent *common.TopicEvent
	handler := func(ctx context.Context, e *common.TopicEvent) (retry bool, err error) {
		topicEvent = e
		recv <- struct{}{}

		return false, nil
	}
	err := s.AddTopicEventHandler(sub, handler)
	assert.NoErrorf(t, err, "error adding event handler")

	s.registerBaseHandler()

	for name, tt := range tests {
		t.Run(name, func(t *testing.T) {
			makeEventRequest(t, s, "/test", tt.data, http.StatusOK)
			<-recv
			assert.Equal(t, tt.result, topicEvent.Data)
		})
	}
}

func TestHealthCheck(t *testing.T) {
	s := newServer("", nil)
	s.registerBaseHandler()
	makeRequest(t, s, "/healthz", "", http.MethodGet, http.StatusOK)
}

func TestActorConfig(t *testing.T) {
	s := newServer("", nil)
	s.registerBaseHandler()
	makeRequest(t, s, "/dapr/config", "", http.MethodGet, http.StatusOK)
}

func TestActorHandler(t *testing.T) {
	reminderReqData, _ := json.Marshal(api.ActorReminderParams{
		Data:    []byte("hello"),
		DueTime: "5s",
		Period:  "5s",
	})

	timerReqData, _ := json.Marshal(api.ActorTimerParam{
		CallBack: "Invoke",
		DueTime:  "5s",
		Period:   "5s",
		Data:     []byte(`"hello"`),
	})

	timerReqDataWithBadCallBackFunction, _ := json.Marshal(api.ActorTimerParam{
		CallBack: "UnexistedFunc",
		DueTime:  "5s",
		Period:   "5s",
		Data:     []byte(`"hello"`),
	})
	s := newServer("", nil)
	s.registerBaseHandler()
	// invoke actor API without target actor defined
	makeRequest(t, s, "/actors/testActorType/testActorID/method/Invoke", "", http.MethodPut, http.StatusNotFound)
	makeRequest(t, s, "/actors/testActorType/testActorID", "", http.MethodDelete, http.StatusNotFound)
	makeRequest(t, s, "/actors/testActorType/testActorID/method/remind/testReminderName", string(reminderReqData), http.MethodPut, http.StatusNotFound)
	makeRequest(t, s, "/actors/testActorType/testActorID/method/timer/testTimerName", string(timerReqData), http.MethodPut, http.StatusNotFound)

	// register test actor factory
	s.RegisterActorImplFactoryContext(mock.ActorImplFactoryCtx)

	// invoke actor API with internal error
	makeRequest(t, s, "/actors/testActorType/testActorID/method/remind/testReminderName", `{
"dueTime": "5s",
"period": "5s",
"data": "test data"`, http.MethodPut, http.StatusInternalServerError)
	makeRequest(t, s, "/actors/testActorType/testActorID/method/Invoke", "bad request param", http.MethodPut, http.StatusInternalServerError)
	makeRequest(t, s, "/actors/testActorType/testActorID/method/timer/testTimerName", string(timerReqDataWithBadCallBackFunction), http.MethodPut, http.StatusInternalServerError)

	// invoke actor API with success status
	makeRequestWithExpectedBody(t, s, "/actors/testActorType/testActorID/method/Invoke", `"invoke request"`, http.MethodPut, http.StatusOK, []byte(`"invoke request"`))
	makeRequest(t, s, "/actors/testActorType/testActorID/method/remind/testReminderName", string(reminderReqData), http.MethodPut, http.StatusOK)
	makeRequest(t, s, "/actors/testActorType/testActorID/method/timer/testTimerName", string(timerReqData), http.MethodPut, http.StatusOK)
	makeRequest(t, s, "/actors/testActorType/testActorID", "", http.MethodDelete, http.StatusOK)

	// register not reminder callee actor factory
	s.RegisterActorImplFactoryContext(mock.NotReminderCalleeActorFactory)
	// invoke call reminder to not reminder callee actor type
	makeRequest(t, s, "/actors/testActorNotReminderCalleeType/testActorID/method/remind/testReminderName", string(reminderReqData), http.MethodPut, http.StatusInternalServerError)
}

func makeRequest(t *testing.T, s *Server, route, data, method string, expectedStatusCode int) {
	t.Helper()

	req, err := http.NewRequest(method, route, strings.NewReader(data))
	assert.NoErrorf(t, err, "error creating request: %s", data)
	testRequest(t, s, req, expectedStatusCode)
}

func makeRequestWithExpectedBody(t *testing.T, s *Server, route, data, method string, expectedStatusCode int, expectedBody []byte) {
	t.Helper()

	req, err := http.NewRequest(method, route, strings.NewReader(data))
	assert.NoErrorf(t, err, "error creating request: %s", data)
	testRequestWithResponseBody(t, s, req, expectedStatusCode, expectedBody)
}

func makeEventRequest(t *testing.T, s *Server, route, data string, expectedStatusCode int) {
	t.Helper()

	req, err := http.NewRequest(http.MethodPost, route, strings.NewReader(data))
	assert.NoErrorf(t, err, "error creating request: %s", data)
	req.Header.Set("Content-Type", "application/json")
	testRequest(t, s, req, expectedStatusCode)
}

func TestAddingInvalidEventHandlers(t *testing.T) {
	s := newServer("", nil)
	err := s.AddTopicEventHandler(nil, testTopicFunc)
	assert.Errorf(t, err, "expected error adding no sub event handler")

	sub := &common.Subscription{Metadata: map[string]string{}}
	err = s.AddTopicEventHandler(sub, testTopicFunc)
	assert.Errorf(t, err, "expected error adding empty sub event handler")

	sub.Topic = "test"
	err = s.AddTopicEventHandler(sub, testTopicFunc)
	assert.Errorf(t, err, "expected error adding sub without component event handler")

	sub.PubsubName = "messages"
	err = s.AddTopicEventHandler(sub, testTopicFunc)
	assert.Errorf(t, err, "expected error adding sub without route event handler")
}

func TestRawPayloadDecode(t *testing.T) {
	testRawTopicFunc := func(ctx context.Context, e *common.TopicEvent) (retry bool, err error) {
		if e.DataContentType != "application/octet-stream" {
			err = fmt.Errorf("invalid content type: %s", e.DataContentType)
		}
		if e.DataBase64 != "eyJtZXNzYWdlIjoiaGVsbG8ifQ==" {
			err = errors.New("error decode data_base64")
		}
		if err != nil {
			assert.NoErrorf(t, err, "error rawPayload decode")
		}
		return
	}

	const rawData = `{
		"datacontenttype" : "application/octet-stream",
		"data_base64" : "eyJtZXNzYWdlIjoiaGVsbG8ifQ=="
	}`

	s := newServer("", nil)

	sub3 := &common.Subscription{
		PubsubName: "messages",
		Topic:      "testRaw",
		Route:      "/raw",
		Metadata: map[string]string{
			"rawPayload": "true",
		},
	}
	err := s.AddTopicEventHandler(sub3, testRawTopicFunc)
	assert.NoErrorf(t, err, "error adding raw event handler")

	s.registerBaseHandler()
	makeEventRequest(t, s, "/raw", rawData, http.StatusOK)
}