/*
Copyright 2014 CoreOS Inc.

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 etcd

import (
	"bytes"
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"reflect"
	"sort"
	"strings"
	"testing"

	"github.com/coreos/etcd/conf"
	"github.com/coreos/etcd/store"
)

func TestMachinesEndPoint(t *testing.T) {
	es, hs := buildCluster(3, false)
	waitCluster(t, es)

	w := make([]string, len(hs))
	for i := range hs {
		w[i] = hs[i].URL
	}

	for i := range hs {
		r, err := http.Get(hs[i].URL + v2machinePrefix)
		if err != nil {
			t.Errorf("%v", err)
			break
		}
		b, err := ioutil.ReadAll(r.Body)
		r.Body.Close()
		if err != nil {
			t.Errorf("%v", err)
			break
		}
		g := strings.Split(string(b), ",")
		sort.Strings(g)
		if !reflect.DeepEqual(w, g) {
			t.Errorf("machines = %v, want %v", g, w)
		}
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

func TestLeaderEndPoint(t *testing.T) {
	es, hs := buildCluster(3, false)
	waitCluster(t, es)

	us := make([]string, len(hs))
	for i := range hs {
		us[i] = hs[i].URL
	}
	// todo(xiangli) change this to raft port...
	w := hs[0].URL + "/raft"

	for i := range hs {
		r, err := http.Get(hs[i].URL + v2LeaderPrefix)
		if err != nil {
			t.Errorf("%v", err)
			break
		}
		b, err := ioutil.ReadAll(r.Body)
		r.Body.Close()
		if err != nil {
			t.Errorf("%v", err)
			break
		}
		if string(b) != w {
			t.Errorf("leader = %v, want %v", string(b), w)
		}
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

func TestStoreStatsEndPoint(t *testing.T) {
	es, hs := buildCluster(1, false)
	waitCluster(t, es)

	resp, err := http.Get(hs[0].URL + v2StoreStatsPrefix)
	if err != nil {
		t.Errorf("%v", err)
	}
	stats := new(store.Stats)
	d := json.NewDecoder(resp.Body)
	err = d.Decode(stats)
	resp.Body.Close()
	if err != nil {
		t.Errorf("%v", err)
	}

	if stats.SetSuccess != 1 {
		t.Errorf("setSuccess = %d, want 1", stats.SetSuccess)
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

func TestGetAdminConfigEndPoint(t *testing.T) {
	es, hs := buildCluster(3, false)
	waitCluster(t, es)

	for i := range hs {
		r, err := http.Get(hs[i].URL + v2adminConfigPrefix)
		if err != nil {
			t.Errorf("%v", err)
			continue
		}
		if g := r.StatusCode; g != 200 {
			t.Errorf("#%d: status = %d, want %d", i, g, 200)
		}
		if g := r.Header.Get("Content-Type"); g != "application/json" {
			t.Errorf("#%d: ContentType = %d, want application/json", i, g)
		}

		conf := new(conf.ClusterConfig)
		err = json.NewDecoder(r.Body).Decode(conf)
		r.Body.Close()
		if err != nil {
			t.Errorf("%v", err)
			continue
		}
		w := conf.NewClusterConfig()
		if !reflect.DeepEqual(conf, w) {
			t.Errorf("#%d: config = %+v, want %+v", i, conf, w)
		}
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

func TestPutAdminConfigEndPoint(t *testing.T) {
	tests := []struct {
		c, wc string
	}{
		{
			`{"activeSize":1,"removeDelay":1,"syncInterval":1}`,
			`{"activeSize":3,"removeDelay":2,"syncInterval":1}`,
		},
		{
			`{"activeSize":5,"removeDelay":20.5,"syncInterval":1.5}`,
			`{"activeSize":5,"removeDelay":20.5,"syncInterval":1.5}`,
		},
		{
			`{"activeSize":5 ,  "removeDelay":20 ,  "syncInterval": 2 }`,
			`{"activeSize":5,"removeDelay":20,"syncInterval":2}`,
		},
		{
			`{"activeSize":3, "removeDelay":60}`,
			`{"activeSize":3,"removeDelay":60,"syncInterval":5}`,
		},
	}

	for i, tt := range tests {
		es, hs := buildCluster(3, false)
		waitCluster(t, es)
		index := es[0].p.Index()

		r, err := NewTestClient().Put(hs[0].URL+v2adminConfigPrefix, "application/json", bytes.NewBufferString(tt.c))
		if err != nil {
			t.Fatalf("%v", err)
		}
		b, err := ioutil.ReadAll(r.Body)
		r.Body.Close()
		if err != nil {
			t.Fatalf("%v", err)
		}
		if wbody := append([]byte(tt.wc), '\n'); !reflect.DeepEqual(b, wbody) {
			t.Errorf("#%d: put result = %s, want %s", i, b, wbody)
		}

		for j := range es {
			w, err := es[j].p.Watch(v2configKVPrefix, false, false, index)
			if err != nil {
				t.Errorf("%v", err)
				continue
			}
			e := <-w.EventChan
			if g := *e.Node.Value; g != tt.wc {
				t.Errorf("#%d.%d: %s = %s, want %s", i, j, v2configKVPrefix, g, tt.wc)
			}
		}

		destoryCluster(t, es, hs)
	}
	afterTest(t)
}

func TestGetAdminMachineEndPoint(t *testing.T) {
	es, hs := buildCluster(3, false)
	waitCluster(t, es)

	for i := range es {
		for j := range hs {
			name := fmt.Sprint(es[i].id)
			r, err := http.Get(hs[j].URL + v2adminMachinesPrefix + name)
			if err != nil {
				t.Errorf("%v", err)
				continue
			}
			if g := r.StatusCode; g != 200 {
				t.Errorf("#%d on %d: status = %d, want %d", i, j, g, 200)
			}
			if g := r.Header.Get("Content-Type"); g != "application/json" {
				t.Errorf("#%d on %d: ContentType = %d, want application/json", i, j, g)
			}

			m := new(machineMessage)
			err = json.NewDecoder(r.Body).Decode(m)
			r.Body.Close()
			if err != nil {
				t.Errorf("%v", err)
				continue
			}
			wm := &machineMessage{
				Name:      name,
				State:     stateFollower,
				ClientURL: hs[i].URL,
				PeerURL:   hs[i].URL,
			}
			if i == 0 {
				wm.State = stateLeader
			}
			if !reflect.DeepEqual(m, wm) {
				t.Errorf("#%d on %d: body = %+v, want %+v", i, j, m, wm)
			}
		}
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

func TestGetAdminMachinesEndPoint(t *testing.T) {
	es, hs := buildCluster(3, false)
	waitCluster(t, es)

	w := make([]*machineMessage, len(hs))
	for i := range hs {
		w[i] = &machineMessage{
			Name:      fmt.Sprint(es[i].id),
			State:     stateFollower,
			ClientURL: hs[i].URL,
			PeerURL:   hs[i].URL,
		}
	}
	w[0].State = stateLeader

	for i := range hs {
		r, err := http.Get(hs[i].URL + v2adminMachinesPrefix)
		if err != nil {
			t.Errorf("%v", err)
			continue
		}
		m := make([]*machineMessage, 0)
		err = json.NewDecoder(r.Body).Decode(&m)
		r.Body.Close()
		if err != nil {
			t.Errorf("%v", err)
			continue
		}

		sm := machineSlice(m)
		sw := machineSlice(w)
		sort.Sort(sm)
		sort.Sort(sw)

		if !reflect.DeepEqual(sm, sw) {
			t.Errorf("on %d: machines = %+v, want %+v", i, sm, sw)
		}
	}

	destoryCluster(t, es, hs)
	afterTest(t)
}

// int64Slice implements sort interface
type machineSlice []*machineMessage

func (s machineSlice) Len() int           { return len(s) }
func (s machineSlice) Less(i, j int) bool { return s[i].Name < s[j].Name }
func (s machineSlice) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }