// Licensed to the Apache Software Foundation (ASF) under one or more
// contributor license agreements.  See the NOTICE file distributed with
// this work for additional information regarding copyright ownership.
// The ASF licenses this file to You 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 apisix

import (
	"context"
	"encoding/json"
	"net/http"
	"net/url"
	"sort"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"golang.org/x/net/nettest"

	"github.com/apache/apisix-ingress-controller/pkg/metrics"
)

type fakeAPISIXPluginSrv struct {
	plugins []string
}

var fakePluginNames = []string{
	"plugin-1",
	"plugin-2",
	"plugin-3",
}

func (srv *fakeAPISIXPluginSrv) ServeHTTP(w http.ResponseWriter, r *http.Request) {
	defer r.Body.Close()

	if !strings.HasPrefix(r.URL.Path, "/apisix/admin/plugins") {
		w.WriteHeader(http.StatusNotFound)
		return
	}

	fakePluginsResp := make(map[string]interface{}, len(srv.plugins))
	for _, fp := range srv.plugins {
		fakePluginsResp[fp] = struct{}{}
	}

	if r.Method == http.MethodGet {
		data, _ := json.Marshal(fakePluginsResp)
		_, _ = w.Write(data)
		w.WriteHeader(http.StatusOK)
		return
	}
}

func runFakePluginSrv(t *testing.T) *http.Server {
	srv := &fakeAPISIXPluginSrv{
		plugins: fakePluginNames,
	}

	ln, _ := nettest.NewLocalListener("tcp")

	httpSrv := &http.Server{
		Addr:    ln.Addr().String(),
		Handler: srv,
	}

	go func() {
		if err := httpSrv.Serve(ln); err != nil && err != http.ErrServerClosed {
			t.Errorf("failed to run http server: %s", err)
		}
	}()

	return httpSrv
}

func TestPluginClient(t *testing.T) {
	srv := runFakePluginSrv(t)
	defer func() {
		assert.Nil(t, srv.Shutdown(context.Background()))
	}()

	u := url.URL{
		Scheme: "http",
		Host:   srv.Addr,
		Path:   "/apisix/admin",
	}

	closedCh := make(chan struct{})
	close(closedCh)
	cli := newPluginClient(&cluster{
		baseURL:          u.String(),
		cli:              http.DefaultClient,
		cache:            &dummyCache{},
		cacheSynced:      closedCh,
		metricsCollector: metrics.NewPrometheusCollector(),
	})

	// List
	objs, err := cli.List(context.Background())
	assert.Nil(t, err)
	assert.Len(t, objs, len(fakePluginNames))
	sort.Strings(fakePluginNames)
	sort.Strings(objs)
	for i := range fakePluginNames {
		assert.Equal(t, fakePluginNames[i], objs[i])
	}
}