// Copyright The Prometheus 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 collector

import (
	"io"
	"net/http"
	"net/http/httptest"
	"net/url"
	"os"
	"path"
	"strings"
	"testing"

	"github.com/prometheus/client_golang/prometheus/testutil"
	"github.com/prometheus/common/promslog"
)

func TestILM(t *testing.T) {
	tests := []struct {
		name string
		file string
		want string
	}{
		{
			name: "6.6.0",
			file: "6.6.0.json",
			want: `
						# HELP elasticsearch_ilm_index_status Status of ILM policy for index
						# TYPE elasticsearch_ilm_index_status gauge
						elasticsearch_ilm_index_status{action="",index="twitter",phase="",step=""} 0
						elasticsearch_ilm_index_status{action="complete",index="facebook",phase="new",step="complete"} 1
						# HELP elasticsearch_ilm_status Current status of ILM. Status can be STOPPED, RUNNING, STOPPING.
            # TYPE elasticsearch_ilm_status gauge
            elasticsearch_ilm_status{operation_mode="RUNNING"} 1
            elasticsearch_ilm_status{operation_mode="STOPPED"} 0
            elasticsearch_ilm_status{operation_mode="STOPPING"} 0
			`,
		},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			indexF, err := os.Open(path.Join("../fixtures/ilm_indices", tt.file))
			if err != nil {
				t.Fatal(err)
			}
			defer indexF.Close()

			statusF, err := os.Open(path.Join("../fixtures/ilm_status", tt.file))
			if err != nil {
				t.Fatal(err)
			}
			defer statusF.Close()

			ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
				sm := http.NewServeMux()
				sm.HandleFunc("/_all/_ilm/explain", func(w http.ResponseWriter, r *http.Request) {
					io.Copy(w, indexF)
				})
				sm.HandleFunc("/_ilm/status", func(w http.ResponseWriter, r *http.Request) {
					io.Copy(w, statusF)
				})

				sm.ServeHTTP(w, r)
			}))
			defer ts.Close()

			u, err := url.Parse(ts.URL)
			if err != nil {
				t.Fatal(err)
			}

			c, err := NewILM(promslog.NewNopLogger(), u, http.DefaultClient)
			if err != nil {
				t.Fatal(err)
			}

			if err := testutil.CollectAndCompare(wrapCollector{c}, strings.NewReader(tt.want)); err != nil {
				t.Fatal(err)
			}
		})
	}
}
