/*
   Copyright (c) 2016 VMware, Inc. All Rights Reserved.
   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 registry

import (
	"encoding/json"
	"fmt"
	"net/http"
	"net/url"
	"strconv"
	"testing"

	"github.com/vmware/harbor/utils/test"
)

func TestNewRegistryWithModifiers(t *testing.T) {
	_, err := NewRegistryWithModifiers("http://registry.org", false, nil)
	if err != nil {
		t.Errorf("fail to crearte client of registry: %v", err)
	}
}

func TestPing(t *testing.T) {
	server := test.NewServer(
		&test.RequestHandlerMapping{
			Method:  "GET",
			Pattern: "/v2/",
			Handler: test.Handler(nil),
		})
	defer server.Close()

	client, err := newRegistryClient(server.URL)
	if err != nil {
		t.Fatalf("failed to create client for registry: %v", err)
	}

	if err = client.Ping(); err != nil {
		t.Errorf("failed to ping registry: %v", err)
	}
}

func TestCatalog(t *testing.T) {
	repositories := make([]string, 0, 1001)
	for i := 0; i < 1001; i++ {
		repositories = append(repositories, strconv.Itoa(i))
	}

	handler := func(w http.ResponseWriter, r *http.Request) {
		q := r.URL.Query()
		last := q.Get("last")
		n, err := strconv.Atoi(q.Get("n"))
		if err != nil || n <= 0 {
			n = 1000
		}

		length := len(repositories)

		begin := length
		if len(last) == 0 {
			begin = 0
		} else {
			for i, repository := range repositories {
				if repository == last {
					begin = i + 1
					break
				}
			}
		}

		end := begin + n
		if end > length {
			end = length
		}

		w.Header().Set(http.CanonicalHeaderKey("Content-Type"), "application/json")
		if end < length {
			u, err := url.Parse("/v2/_catalog")
			if err != nil {
				w.WriteHeader(http.StatusInternalServerError)
				return
			}
			values := u.Query()
			values.Add("last", repositories[end-1])
			values.Add("n", strconv.Itoa(n))

			u.RawQuery = values.Encode()

			link := fmt.Sprintf("<%s>; rel=\"next\"", u.String())
			w.Header().Set(http.CanonicalHeaderKey("link"), link)
		}

		repos := struct {
			Repositories []string `json:"repositories"`
		}{
			Repositories: []string{},
		}

		if begin < length {
			repos.Repositories = repositories[begin:end]
		}

		b, err := json.Marshal(repos)
		if err != nil {
			w.WriteHeader(http.StatusInternalServerError)
			return
		}

		w.Write(b)

	}

	server := test.NewServer(
		&test.RequestHandlerMapping{
			Method:  "GET",
			Pattern: "/v2/_catalog",
			Handler: handler,
		})
	defer server.Close()

	client, err := newRegistryClient(server.URL)
	if err != nil {
		t.Fatalf("failed to create client for registry: %v", err)
	}

	repos, err := client.Catalog()
	if err != nil {
		t.Fatalf("failed to catalog repositories: %v", err)
	}

	if len(repos) != len(repositories) {
		t.Errorf("unexpected length of repositories: %d != %d", len(repos), len(repositories))
	}
}

func newRegistryClient(url string) (*Registry, error) {
	return NewRegistry(url, &http.Client{})
}