/*
 *     Copyright 2024 The Dragonfly 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 handlers

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

	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/assert"
	"go.uber.org/mock/gomock"

	"d7y.io/dragonfly/v2/manager/service/mocks"
	"d7y.io/dragonfly/v2/manager/types"
	"d7y.io/dragonfly/v2/pkg/objectstorage"
)

var (
	mockBucketReqBody = `
		{
		  "name": "bucket"
		}`
	mockCreateBucketRequest = types.CreateBucketRequest{
		Name: "bucket",
	}
	mockBucketMetadata = &objectstorage.BucketMetadata{
		Name:     "bucket",
		CreateAt: time.Date(2024, 4, 17, 18, 0, 21, 580470900, time.UTC),
	}
)

func mockBucketRouter(h *Handlers) *gin.Engine {
	r := gin.Default()
	apiv1 := r.Group("/api/v1")
	bucket := apiv1.Group("/buckets")
	bucket.POST("", h.CreateBucket)
	bucket.DELETE(":id", h.DestroyBucket)
	bucket.GET(":id", h.GetBucket)
	bucket.GET("", h.GetBuckets)
	return r
}

func TestHandlers_CreateBucket(t *testing.T) {
	tests := []struct {
		name   string
		req    *http.Request
		mock   func(ms *mocks.MockServiceMockRecorder)
		expect func(t *testing.T, w *httptest.ResponseRecorder)
	}{
		{
			name: "unprocessable entity",
			req:  httptest.NewRequest(http.MethodPost, "/api/v1/buckets", strings.NewReader(`{"name":""}`)),
			mock: func(ms *mocks.MockServiceMockRecorder) {},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusUnprocessableEntity, w.Code)
			},
		},
		{
			name: "success",
			req:  httptest.NewRequest(http.MethodPost, "/api/v1/buckets", strings.NewReader(mockBucketReqBody)),
			mock: func(ms *mocks.MockServiceMockRecorder) {
				ms.CreateBucket(gomock.Any(), gomock.Eq(mockCreateBucketRequest)).Return(nil).Times(1)
			},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusOK, w.Code)
			},
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			ctl := gomock.NewController(t)
			defer ctl.Finish()
			svc := mocks.NewMockService(ctl)
			w := httptest.NewRecorder()
			h := New(svc)
			mockRouter := mockBucketRouter(h)

			tc.mock(svc.EXPECT())
			mockRouter.ServeHTTP(w, tc.req)
			tc.expect(t, w)
		})
	}
}

func TestHandlers_DestroyBucket(t *testing.T) {
	tests := []struct {
		name   string
		req    *http.Request
		mock   func(ms *mocks.MockServiceMockRecorder)
		expect func(t *testing.T, w *httptest.ResponseRecorder)
	}{
		{
			name: "not found",
			req:  httptest.NewRequest(http.MethodDelete, "/api/v1/buckets", nil),
			mock: func(ms *mocks.MockServiceMockRecorder) {},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusNotFound, w.Code)
			},
		},
		{
			name: "success",
			req:  httptest.NewRequest(http.MethodDelete, "/api/v1/buckets/bucket", nil),
			mock: func(ms *mocks.MockServiceMockRecorder) {
				ms.DestroyBucket(gomock.Any(), gomock.Eq("bucket")).Return(nil).Times(1)
			},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusOK, w.Code)
			},
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			ctl := gomock.NewController(t)
			defer ctl.Finish()
			svc := mocks.NewMockService(ctl)
			w := httptest.NewRecorder()
			h := New(svc)
			mockRouter := mockBucketRouter(h)

			tc.mock(svc.EXPECT())
			mockRouter.ServeHTTP(w, tc.req)
			tc.expect(t, w)
		})
	}
}

func TestHandlers_GetBucket(t *testing.T) {
	tests := []struct {
		name   string
		req    *http.Request
		mock   func(ms *mocks.MockServiceMockRecorder)
		expect func(t *testing.T, w *httptest.ResponseRecorder)
	}{
		{
			name: "success",
			req:  httptest.NewRequest(http.MethodGet, "/api/v1/buckets/bucket", nil),
			mock: func(ms *mocks.MockServiceMockRecorder) {
				ms.GetBucket(gomock.Any(), gomock.Eq("bucket")).Return(mockBucketMetadata, nil).Times(1)
			},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusOK, w.Code)
				bucketMetadata := objectstorage.BucketMetadata{}
				err := json.Unmarshal(w.Body.Bytes(), &bucketMetadata)
				assert.NoError(err)
				assert.Equal(mockBucketMetadata, &bucketMetadata)
			},
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			ctl := gomock.NewController(t)
			defer ctl.Finish()
			svc := mocks.NewMockService(ctl)
			w := httptest.NewRecorder()
			h := New(svc)
			mockRouter := mockBucketRouter(h)

			tc.mock(svc.EXPECT())
			mockRouter.ServeHTTP(w, tc.req)
			tc.expect(t, w)
		})
	}
}

func TestHandlers_GetBuckets(t *testing.T) {
	tests := []struct {
		name   string
		req    *http.Request
		mock   func(ms *mocks.MockServiceMockRecorder)
		expect func(t *testing.T, w *httptest.ResponseRecorder)
	}{
		{
			name: "success",
			req:  httptest.NewRequest(http.MethodGet, "/api/v1/buckets", nil),
			mock: func(ms *mocks.MockServiceMockRecorder) {
				ms.GetBuckets(gomock.Any()).Return([]*objectstorage.BucketMetadata{mockBucketMetadata}, nil).Times(1)
			},
			expect: func(t *testing.T, w *httptest.ResponseRecorder) {
				assert := assert.New(t)
				assert.Equal(http.StatusOK, w.Code)
				bucketMetadata := objectstorage.BucketMetadata{}
				err := json.Unmarshal(w.Body.Bytes()[1:w.Body.Len()-1], &bucketMetadata)
				assert.NoError(err)
				assert.Equal(mockBucketMetadata, &bucketMetadata)
			},
		},
	}
	for _, tc := range tests {
		t.Run(tc.name, func(t *testing.T) {
			ctl := gomock.NewController(t)
			defer ctl.Finish()
			svc := mocks.NewMockService(ctl)
			w := httptest.NewRecorder()
			h := New(svc)
			mockRouter := mockBucketRouter(h)

			tc.mock(svc.EXPECT())
			mockRouter.ServeHTTP(w, tc.req)
			tc.expect(t, w)
		})
	}
}