package externalip_test

import (
	"fmt"
	"net"
	"net/http"
	"net/http/httptest"
	"testing"
	"time"

	"git.narnian.us/lordwelch/externalip"
)

func newConcensus(url string) *externalip.Consensus {
	consensus := externalip.NewConsensus(&externalip.ConsensusConfig{
		Timeout: time.Second * 30,
	}, nil)

	// TLS-protected providers
	_ = consensus.AddVoter(externalip.NewHTTPSource(url, externalip.IPv4), 1)
	_ = consensus.AddVoter(externalip.NewHTTPSource(url, externalip.IPv4), 1)
	_ = consensus.AddVoter(externalip.NewHTTPSource(url, externalip.IPv4), 1)

	return consensus
}

func newServer(ip1, ip2, ip3 string) *httptest.Server {
	var try = 1
	return httptest.NewServer(http.HandlerFunc(
		func(w http.ResponseWriter, r *http.Request) {
			w.WriteHeader(200)
			switch try {
			case 1:
				fmt.Fprintln(w, ip1)
			case 2:
				fmt.Fprintln(w, ip2)
			case 3:
				fmt.Fprintln(w, ip3)
				try = 1
			}
			try++
		}))
}

func TestConsensus(t *testing.T) {
	server := newServer("127.0.0.1", "127.0.0.1", "127.0.0.2")
	consensus := newConcensus(server.URL)
	if consensus == nil {
		t.Fatal("default consensus should never be nil")
	}

	ip, err := consensus.ExternalIP(4)
	if err != nil {
		t.Fatal("couldn't get external IP", err)
	}
	if !ip.Equal(net.IPv4(127, 0, 0, 1)) {
		t.Errorf("invalid ip found: expected %s recieved %s", "127.0.0.1", ip)
	}
}

func TestConsensus2(t *testing.T) {
	server := newServer("127.0.0.1", "127.0.0.2", "127.0.0.2")
	consensus := newConcensus(server.URL)
	if consensus == nil {
		t.Fatal("default consensus should never be nil")
	}

	ip, err := consensus.ExternalIP(4)
	if err != nil {
		t.Fatal("couldn't get external IP", err)
	}
	if !ip.Equal(net.IPv4(127, 0, 0, 2)) {
		t.Errorf("invalid ip found: expected %s recieved %s", "127.0.0.2", ip)
	}
}

func TestConsensus3(t *testing.T) {
	server := newServer("127.0.0.1", "127.0.0.2", "127.0.0.3")
	consensus := newConcensus(server.URL)
	if consensus == nil {
		t.Fatal("default consensus should never be nil")
	}

	ip, err := consensus.ExternalIP(4)
	if err != nil {
		t.Fatal("couldn't get external IP", err)
	}
	if !ip.Equal(net.IPv4(127, 0, 0, 1)) {
		t.Errorf("invalid ip found: expected %s recieved %s; This will fail on multiple runs it takes whichever request returns first", "127.0.0.1", ip)
	}
}