package consul

import (
	"errors"
	"fmt"
	"io/ioutil"
	"net"
	"os"
	"testing"
	"time"

	"github.com/hashicorp/consul/testutil"
)

var nextPort = 15000

func getPort() int {
	p := nextPort
	nextPort++
	return p
}

func tmpDir(t *testing.T) string {
	dir, err := ioutil.TempDir("", "consul")
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	return dir
}

func configureTLS(config *Config) {
	config.CAFile = "../test/ca/root.cer"
	config.CertFile = "../test/key/ourdomain.cer"
	config.KeyFile = "../test/key/ourdomain.key"
}

func testServerConfig(t *testing.T, NodeName string) (string, *Config) {
	dir := tmpDir(t)
	config := DefaultConfig()

	config.NodeName = NodeName
	config.Bootstrap = true
	config.Datacenter = "dc1"
	config.DataDir = dir
	config.RPCAddr = &net.TCPAddr{
		IP:   []byte{127, 0, 0, 1},
		Port: getPort(),
	}
	config.SerfLANConfig.MemberlistConfig.BindAddr = "127.0.0.1"
	config.SerfLANConfig.MemberlistConfig.BindPort = getPort()
	config.SerfLANConfig.MemberlistConfig.SuspicionMult = 2
	config.SerfLANConfig.MemberlistConfig.ProbeTimeout = 50 * time.Millisecond
	config.SerfLANConfig.MemberlistConfig.ProbeInterval = 100 * time.Millisecond
	config.SerfLANConfig.MemberlistConfig.GossipInterval = 100 * time.Millisecond

	config.SerfWANConfig.MemberlistConfig.BindAddr = "127.0.0.1"
	config.SerfWANConfig.MemberlistConfig.BindPort = getPort()
	config.SerfWANConfig.MemberlistConfig.SuspicionMult = 2
	config.SerfWANConfig.MemberlistConfig.ProbeTimeout = 50 * time.Millisecond
	config.SerfWANConfig.MemberlistConfig.ProbeInterval = 100 * time.Millisecond
	config.SerfWANConfig.MemberlistConfig.GossipInterval = 100 * time.Millisecond

	config.RaftConfig.LeaderLeaseTimeout = 20 * time.Millisecond
	config.RaftConfig.HeartbeatTimeout = 40 * time.Millisecond
	config.RaftConfig.ElectionTimeout = 40 * time.Millisecond

	config.ReconcileInterval = 100 * time.Millisecond
	return dir, config
}

func testServer(t *testing.T) (string, *Server) {
	return testServerDC(t, "dc1")
}

func testServerDC(t *testing.T, dc string) (string, *Server) {
	return testServerDCBootstrap(t, dc, true)
}

func testServerDCBootstrap(t *testing.T, dc string, bootstrap bool) (string, *Server) {
	name := fmt.Sprintf("Node %d", getPort())
	dir, config := testServerConfig(t, name)
	config.Datacenter = dc
	config.Bootstrap = bootstrap
	server, err := NewServer(config)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	return dir, server
}

func testServerDCExpect(t *testing.T, dc string, expect int) (string, *Server) {
	name := fmt.Sprintf("Node %d", getPort())
	dir, config := testServerConfig(t, name)
	config.Datacenter = dc
	config.Bootstrap = false
	config.BootstrapExpect = expect
	server, err := NewServer(config)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	return dir, server
}

func testServerWithConfig(t *testing.T, cb func(c *Config)) (string, *Server) {
	name := fmt.Sprintf("Node %d", getPort())
	dir, config := testServerConfig(t, name)
	cb(config)
	server, err := NewServer(config)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	return dir, server
}

func TestServer_StartStop(t *testing.T) {
	dir := tmpDir(t)
	defer os.RemoveAll(dir)

	config := DefaultConfig()
	config.DataDir = dir

	private, err := GetPrivateIP()
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	config.RPCAdvertise = &net.TCPAddr{
		IP:   private,
		Port: 8300,
	}

	server, err := NewServer(config)
	if err != nil {
		t.Fatalf("err: %v", err)
	}

	if err := server.Shutdown(); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Idempotent
	if err := server.Shutdown(); err != nil {
		t.Fatalf("err: %v", err)
	}
}

func TestServer_JoinLAN(t *testing.T) {
	dir1, s1 := testServer(t)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	dir2, s2 := testServer(t)
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfLANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Check the members
	testutil.WaitForResult(func() (bool, error) {
		return len(s1.LANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})

	testutil.WaitForResult(func() (bool, error) {
		return len(s2.LANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})
}

func TestServer_JoinWAN(t *testing.T) {
	dir1, s1 := testServer(t)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	dir2, s2 := testServerDC(t, "dc2")
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfWANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinWAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Check the members
	testutil.WaitForResult(func() (bool, error) {
		return len(s1.WANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})

	testutil.WaitForResult(func() (bool, error) {
		return len(s2.WANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})

	// Check the remoteConsuls has both
	if len(s1.remoteConsuls) != 2 {
		t.Fatalf("remote consul missing")
	}

	testutil.WaitForResult(func() (bool, error) {
		return len(s2.remoteConsuls) == 2, nil
	}, func(err error) {
		t.Fatalf("remote consul missing")
	})
}

func TestServer_Leave(t *testing.T) {
	dir1, s1 := testServer(t)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	// Second server not in bootstrap mode
	dir2, s2 := testServerDCBootstrap(t, "dc1", false)
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfLANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	var p1 []net.Addr
	var p2 []net.Addr

	testutil.WaitForResult(func() (bool, error) {
		p1, _ = s1.raftPeers.Peers()
		return len(p1) == 2, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 2 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p2, _ = s2.raftPeers.Peers()
		return len(p2) == 2, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 2 peers: %v", err)
	})

	// Issue a leave
	if err := s2.Leave(); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Should lose a peer
	p1, _ = s1.raftPeers.Peers()
	if len(p1) != 1 {
		t.Fatalf("should have 1 peer: %v", p1)
	}
}

func TestServer_RPC(t *testing.T) {
	dir1, s1 := testServer(t)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	var out struct{}
	if err := s1.RPC("Status.Ping", struct{}{}, &out); err != nil {
		t.Fatalf("err: %v", err)
	}
}

func TestServer_JoinLAN_TLS(t *testing.T) {
	dir1, conf1 := testServerConfig(t, "a.testco.internal")
	conf1.VerifyIncoming = true
	conf1.VerifyOutgoing = true
	configureTLS(conf1)
	s1, err := NewServer(conf1)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	dir2, conf2 := testServerConfig(t, "b.testco.internal")
	conf2.Bootstrap = false
	conf2.VerifyIncoming = true
	conf2.VerifyOutgoing = true
	configureTLS(conf2)
	s2, err := NewServer(conf2)
	if err != nil {
		t.Fatalf("err: %v", err)
	}
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfLANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	// Check the members
	testutil.WaitForResult(func() (bool, error) {
		return len(s1.LANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})

	testutil.WaitForResult(func() (bool, error) {
		return len(s2.LANMembers()) == 2, nil
	}, func(err error) {
		t.Fatalf("bad len")
	})

	// Verify Raft has established a peer
	testutil.WaitForResult(func() (bool, error) {
		return s1.Stats()["raft"]["num_peers"] == "1", nil
	}, func(err error) {
		t.Fatalf("no peer established")
	})

	testutil.WaitForResult(func() (bool, error) {
		return s2.Stats()["raft"]["num_peers"] == "1", nil
	}, func(err error) {
		t.Fatalf("no peer established")
	})
}

func TestServer_Expect(t *testing.T) {
	// all test servers should be in expect=3 mode
	dir1, s1 := testServerDCExpect(t, "dc1", 3)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	dir2, s2 := testServerDCExpect(t, "dc1", 3)
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	dir3, s3 := testServerDCExpect(t, "dc1", 0)
	defer os.RemoveAll(dir3)
	defer s3.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfLANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	var p1 []net.Addr
	var p2 []net.Addr

	// should have no peers yet
	testutil.WaitForResult(func() (bool, error) {
		p1, _ = s1.raftPeers.Peers()
		return len(p1) == 0, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p2, _ = s2.raftPeers.Peers()
		return len(p2) == 0, errors.New(fmt.Sprintf("%v", p2))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	// join the third node
	if _, err := s3.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	var p3 []net.Addr

	// should now have all three peers
	testutil.WaitForResult(func() (bool, error) {
		p1, _ = s1.raftPeers.Peers()
		return len(p1) == 3, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 3 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p2, _ = s2.raftPeers.Peers()
		return len(p2) == 3, errors.New(fmt.Sprintf("%v", p2))
	}, func(err error) {
		t.Fatalf("should have 3 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p3, _ = s3.raftPeers.Peers()
		return len(p3) == 3, errors.New(fmt.Sprintf("%v", p3))
	}, func(err error) {
		t.Fatalf("should have 3 peers: %v", err)
	})

	// check if there is one leader now
	testutil.WaitForLeader(t, s1.RPC, "dc1")
}

func TestServer_BadExpect(t *testing.T) {
	// this one is in expect=3 mode
	dir1, s1 := testServerDCExpect(t, "dc1", 3)
	defer os.RemoveAll(dir1)
	defer s1.Shutdown()

	// this one is in expect=2 mode
	dir2, s2 := testServerDCExpect(t, "dc1", 2)
	defer os.RemoveAll(dir2)
	defer s2.Shutdown()

	// and this one is in expect=3 mode
	dir3, s3 := testServerDCExpect(t, "dc1", 3)
	defer os.RemoveAll(dir3)
	defer s3.Shutdown()

	// Try to join
	addr := fmt.Sprintf("127.0.0.1:%d",
		s1.config.SerfLANConfig.MemberlistConfig.BindPort)
	if _, err := s2.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	var p1 []net.Addr
	var p2 []net.Addr

	// should have no peers yet
	testutil.WaitForResult(func() (bool, error) {
		p1, _ = s1.raftPeers.Peers()
		return len(p1) == 0, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p2, _ = s2.raftPeers.Peers()
		return len(p2) == 0, errors.New(fmt.Sprintf("%v", p2))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	// join the third node
	if _, err := s3.JoinLAN([]string{addr}); err != nil {
		t.Fatalf("err: %v", err)
	}

	var p3 []net.Addr

	// should still have no peers (because s2 is in expect=2 mode)
	testutil.WaitForResult(func() (bool, error) {
		p1, _ = s1.raftPeers.Peers()
		return len(p1) == 0, errors.New(fmt.Sprintf("%v", p1))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p2, _ = s2.raftPeers.Peers()
		return len(p2) == 0, errors.New(fmt.Sprintf("%v", p2))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

	testutil.WaitForResult(func() (bool, error) {
		p3, _ = s3.raftPeers.Peers()
		return len(p3) == 0, errors.New(fmt.Sprintf("%v", p3))
	}, func(err error) {
		t.Fatalf("should have 0 peers: %v", err)
	})

}