package cluster

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"testing"
)

func Test_SingleJoinOK(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Fatalf("Client did not use POST")
		}
		w.WriteHeader(http.StatusOK)
	}))
	defer ts.Close()

	j, err := Join([]string{ts.URL}, "id0", "127.0.0.1:9090", nil, nil)
	if err != nil {
		t.Fatalf("failed to join a single node: %s", err.Error())
	}
	if j != ts.URL+"/join" {
		t.Fatalf("node joined using wrong endpoint, exp: %s, got: %s", j, ts.URL)
	}
}

func Test_SingleJoinMetaOK(t *testing.T) {
	var body map[string]interface{}

	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.Method != "POST" {
			t.Fatalf("Client did not use POST")
		}
		w.WriteHeader(http.StatusOK)

		b, err := ioutil.ReadAll(r.Body)
		if err != nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}

		if err := json.Unmarshal(b, &body); err != nil {
			w.WriteHeader(http.StatusBadRequest)
			return
		}
	}))
	defer ts.Close()

	nodeAddr := "127.0.0.1:9090"
	md := map[string]string{"foo": "bar"}
	j, err := Join([]string{ts.URL}, "id0", nodeAddr, md, nil)
	if err != nil {
		t.Fatalf("failed to join a single node: %s", err.Error())
	}
	if j != ts.URL+"/join" {
		t.Fatalf("node joined using wrong endpoint, exp: %s, got: %s", j, ts.URL)
	}

	if id, _ := body["id"]; id != "id0" {
		t.Fatalf("node joined supplying wrong ID, exp %s, got %s", "id0", body["id"])
	}
	if addr, _ := body["addr"]; addr != nodeAddr {
		t.Fatalf("node joined supplying wrong address, exp %s, got %s", nodeAddr, body["addr"])
	}
	rxMd, _ := body["meta"].(map[string]interface{})
	if len(rxMd) != len(md) || rxMd["foo"] != "bar" {
		t.Fatalf("node joined supplying wrong meta")
	}
}

func Test_SingleJoinFail(t *testing.T) {
	ts := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadRequest)
	}))
	defer ts.Close()

	_, err := Join([]string{ts.URL}, "id0", "127.0.0.1:9090", nil, nil)
	if err == nil {
		t.Fatalf("expected error when joining bad node")
	}
}

func Test_DoubleJoinOK(t *testing.T) {
	ts1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	}))
	defer ts1.Close()
	ts2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	}))
	defer ts2.Close()

	j, err := Join([]string{ts1.URL, ts2.URL}, "id0", "127.0.0.1:9090", nil, nil)
	if err != nil {
		t.Fatalf("failed to join a single node: %s", err.Error())
	}
	if j != ts1.URL+"/join" {
		t.Fatalf("node joined using wrong endpoint, exp: %s, got: %s", j, ts1.URL)
	}
}

func Test_DoubleJoinOKSecondNode(t *testing.T) {
	ts1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.WriteHeader(http.StatusBadRequest)
	}))
	defer ts1.Close()
	ts2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	}))
	defer ts2.Close()

	j, err := Join([]string{ts1.URL, ts2.URL}, "id0", "127.0.0.1:9090", nil, nil)
	if err != nil {
		t.Fatalf("failed to join a single node: %s", err.Error())
	}
	if j != ts2.URL+"/join" {
		t.Fatalf("node joined using wrong endpoint, exp: %s, got: %s", j, ts2.URL)
	}
}

func Test_DoubleJoinOKSecondNodeRedirect(t *testing.T) {
	ts1 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
	}))
	defer ts1.Close()
	redirectAddr := fmt.Sprintf("%s%s", ts1.URL, "/join")

	ts2 := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Redirect(w, r, redirectAddr, http.StatusMovedPermanently)
	}))
	defer ts2.Close()

	j, err := Join([]string{ts2.URL}, "id0", "127.0.0.1:9090", nil, nil)
	if err != nil {
		t.Fatalf("failed to join a single node: %s", err.Error())
	}
	if j != redirectAddr {
		t.Fatalf("node joined using wrong endpoint, exp: %s, got: %s", redirectAddr, j)
	}
}