package nomad

import (
	"testing"
	"time"

	msgpackrpc "github.com/hashicorp/net-rpc-msgpackrpc"
	"github.com/hashicorp/nomad/acl"
	"github.com/hashicorp/nomad/ci"
	"github.com/hashicorp/nomad/helper/uuid"
	"github.com/hashicorp/nomad/nomad/mock"
	"github.com/hashicorp/nomad/nomad/structs"
	"github.com/hashicorp/nomad/testutil"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestScalingEndpoint_StaleReadSupport(t *testing.T) {
	ci.Parallel(t)
	assert := assert.New(t)
	list := &structs.ScalingPolicyListRequest{}
	assert.True(list.IsRead())
	get := &structs.ScalingPolicySpecificRequest{}
	assert.True(get.IsRead())
}

func TestScalingEndpoint_GetPolicy(t *testing.T) {
	ci.Parallel(t)
	require := require.New(t)

	s1, cleanupS1 := TestServer(t, nil)
	defer cleanupS1()
	codec := rpcClient(t, s1)
	testutil.WaitForLeader(t, s1.RPC)

	p1 := mock.ScalingPolicy()
	p2 := mock.ScalingPolicy()
	s1.fsm.State().UpsertScalingPolicies(1000, []*structs.ScalingPolicy{p1, p2})

	// Add another policy at a higher index.
	p3 := mock.ScalingPolicy()
	require.NoError(s1.fsm.State().UpsertScalingPolicies(2000, []*structs.ScalingPolicy{p3}))

	// Lookup the first policy and perform assertions.
	get := &structs.ScalingPolicySpecificRequest{
		ID: p1.ID,
		QueryOptions: structs.QueryOptions{
			Region: "global",
		},
	}
	var resp structs.SingleScalingPolicyResponse
	err := msgpackrpc.CallWithCodec(codec, "Scaling.GetPolicy", get, &resp)
	require.NoError(err)
	require.EqualValues(1000, resp.Index)
	require.Equal(*p1, *resp.Policy)

	// Lookup non-existing policy
	get.ID = uuid.Generate()
	resp = structs.SingleScalingPolicyResponse{}
	err = msgpackrpc.CallWithCodec(codec, "Scaling.GetPolicy", get, &resp)
	require.NoError(err)
	require.EqualValues(2000, resp.Index)
	require.Nil(resp.Policy)
}

func TestScalingEndpoint_GetPolicy_ACL(t *testing.T) {
	ci.Parallel(t)
	require := require.New(t)

	s1, root, cleanupS1 := TestACLServer(t, nil)
	defer cleanupS1()
	codec := rpcClient(t, s1)
	testutil.WaitForLeader(t, s1.RPC)
	state := s1.fsm.State()

	p1 := mock.ScalingPolicy()
	p2 := mock.ScalingPolicy()
	state.UpsertScalingPolicies(1000, []*structs.ScalingPolicy{p1, p2})

	get := &structs.ScalingPolicySpecificRequest{
		ID: p1.ID,
		QueryOptions: structs.QueryOptions{
			Region: "global",
		},
	}

	// lookup without token should fail
	var resp structs.SingleScalingPolicyResponse
	err := msgpackrpc.CallWithCodec(codec, "Scaling.GetPolicy", get, &resp)
	require.Error(err)
	require.Contains(err.Error(), "Permission denied")

	// Expect failure for request with an invalid token
	invalidToken := mock.CreatePolicyAndToken(t, state, 1003, "test-invalid",
		mock.NamespacePolicy(structs.DefaultNamespace, "", []string{acl.NamespaceCapabilityListScalingPolicies}))
	get.AuthToken = invalidToken.SecretID
	err = msgpackrpc.CallWithCodec(codec, "Scaling.GetPolicy", get, &resp)
	require.Error(err)
	require.Contains(err.Error(), "Permission denied")
	type testCase struct {
		authToken string
		name      string
	}
	cases := []testCase{
		{
			name:      "mgmt token should succeed",
			authToken: root.SecretID,
		},
		{
			name: "read disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-read",
				mock.NamespacePolicy(structs.DefaultNamespace, "read", nil)).SecretID,
		},
		{
			name: "write disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-write",
				mock.NamespacePolicy(structs.DefaultNamespace, "write", nil)).SecretID,
		},
		{
			name: "autoscaler disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-autoscaler",
				mock.NamespacePolicy(structs.DefaultNamespace, "scale", nil)).SecretID,
		},
		{
			name: "list-jobs+read-job capability should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-read-job-scaling",
				mock.NamespacePolicy(structs.DefaultNamespace, "", []string{acl.NamespaceCapabilityListJobs, acl.NamespaceCapabilityReadJob})).SecretID,
		},
	}

	for _, tc := range cases {
		get.AuthToken = tc.authToken
		err = msgpackrpc.CallWithCodec(codec, "Scaling.GetPolicy", get, &resp)
		require.NoError(err, tc.name)
		require.EqualValues(1000, resp.Index)
		require.NotNil(resp.Policy)
	}

}

func TestScalingEndpoint_ListPolicies(t *testing.T) {
	ci.Parallel(t)

	s1, cleanupS1 := TestServer(t, nil)
	defer cleanupS1()
	codec := rpcClient(t, s1)
	testutil.WaitForLeader(t, s1.RPC)

	// Lookup the policies
	var resp structs.ScalingPolicyListResponse
	err := msgpackrpc.CallWithCodec(codec, "Scaling.ListPolicies", &structs.ScalingPolicyListRequest{
		QueryOptions: structs.QueryOptions{
			Region:    "global",
			Namespace: "default",
		},
	}, &resp)
	require.NoError(t, err)
	require.Empty(t, resp.Policies)

	j1 := mock.Job()
	j1polV := mock.ScalingPolicy()
	j1polV.Type = "vertical-cpu"
	j1polV.TargetTask(j1, j1.TaskGroups[0], j1.TaskGroups[0].Tasks[0])
	j1polH := mock.ScalingPolicy()
	j1polH.Type = "horizontal"
	j1polH.TargetTaskGroup(j1, j1.TaskGroups[0])

	j2 := mock.Job()
	j2polH := mock.ScalingPolicy()
	j2polH.Type = "horizontal"
	j2polH.TargetTaskGroup(j2, j2.TaskGroups[0])

	s1.fsm.State().UpsertJob(structs.MsgTypeTestSetup, 1000, j1)
	s1.fsm.State().UpsertJob(structs.MsgTypeTestSetup, 1000, j2)

	pols := []*structs.ScalingPolicy{j1polV, j1polH, j2polH}
	s1.fsm.State().UpsertScalingPolicies(1000, pols)
	for _, p := range pols {
		p.ModifyIndex = 1000
		p.CreateIndex = 1000
	}

	cases := []struct {
		Label    string
		Job      string
		Type     string
		Expected []*structs.ScalingPolicy
	}{
		{
			Label:    "all policies",
			Expected: []*structs.ScalingPolicy{j1polH, j1polV, j2polH},
		},
		{
			Label:    "job filter",
			Job:      j1.ID,
			Expected: []*structs.ScalingPolicy{j1polH, j1polV},
		},
		{
			Label:    "type filter",
			Type:     "horizontal",
			Expected: []*structs.ScalingPolicy{j1polH, j2polH},
		},
		{
			Label:    "job and type",
			Job:      j1.ID,
			Type:     "horizontal",
			Expected: []*structs.ScalingPolicy{j1polH},
		},
	}

	for _, tc := range cases {
		t.Run(tc.Label, func(t *testing.T) {
			get := &structs.ScalingPolicyListRequest{
				Job:  tc.Job,
				Type: tc.Type,
				QueryOptions: structs.QueryOptions{
					Region:    "global",
					Namespace: "default",
				},
			}
			var resp structs.ScalingPolicyListResponse
			err = msgpackrpc.CallWithCodec(codec, "Scaling.ListPolicies", get, &resp)
			require.NoError(t, err)
			stubs := []*structs.ScalingPolicyListStub{}
			for _, p := range tc.Expected {
				stubs = append(stubs, p.Stub())
			}
			require.ElementsMatch(t, stubs, resp.Policies)
		})
	}
}

func TestScalingEndpoint_ListPolicies_ACL(t *testing.T) {
	ci.Parallel(t)
	require := require.New(t)

	s1, root, cleanupS1 := TestACLServer(t, nil)
	defer cleanupS1()
	codec := rpcClient(t, s1)
	testutil.WaitForLeader(t, s1.RPC)
	state := s1.fsm.State()

	p1 := mock.ScalingPolicy()
	p2 := mock.ScalingPolicy()
	state.UpsertScalingPolicies(1000, []*structs.ScalingPolicy{p1, p2})

	get := &structs.ScalingPolicyListRequest{
		QueryOptions: structs.QueryOptions{
			Region:    "global",
			Namespace: "default",
		},
	}

	// lookup without token should fail
	var resp structs.ACLPolicyListResponse
	err := msgpackrpc.CallWithCodec(codec, "Scaling.ListPolicies", get, &resp)
	require.Error(err)
	require.Contains(err.Error(), "Permission denied")

	// Expect failure for request with an invalid token
	invalidToken := mock.CreatePolicyAndToken(t, state, 1003, "test-invalid",
		mock.NamespacePolicy(structs.DefaultNamespace, "", []string{acl.NamespaceCapabilityListScalingPolicies}))
	get.AuthToken = invalidToken.SecretID
	require.Error(err)
	require.Contains(err.Error(), "Permission denied")

	type testCase struct {
		authToken string
		name      string
	}
	cases := []testCase{
		{
			name:      "mgmt token should succeed",
			authToken: root.SecretID,
		},
		{
			name: "read disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-read",
				mock.NamespacePolicy(structs.DefaultNamespace, "read", nil)).SecretID,
		},
		{
			name: "write disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-write",
				mock.NamespacePolicy(structs.DefaultNamespace, "write", nil)).SecretID,
		},
		{
			name: "autoscaler disposition should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-autoscaler",
				mock.NamespacePolicy(structs.DefaultNamespace, "scale", nil)).SecretID,
		},
		{
			name: "list-scaling-policies capability should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-list-scaling-policies",
				mock.NamespacePolicy(structs.DefaultNamespace, "", []string{acl.NamespaceCapabilityListScalingPolicies})).SecretID,
		},
		{
			name: "list-jobs+read-job capability should succeed",
			authToken: mock.CreatePolicyAndToken(t, state, 1005, "test-valid-read-job-scaling",
				mock.NamespacePolicy(structs.DefaultNamespace, "", []string{acl.NamespaceCapabilityListJobs, acl.NamespaceCapabilityReadJob})).SecretID,
		},
	}

	for _, tc := range cases {
		get.AuthToken = tc.authToken
		err = msgpackrpc.CallWithCodec(codec, "Scaling.ListPolicies", get, &resp)
		require.NoError(err, tc.name)
		require.EqualValues(1000, resp.Index)
		require.Len(resp.Policies, 2)
	}
}

func TestScalingEndpoint_ListPolicies_Blocking(t *testing.T) {
	ci.Parallel(t)
	require := require.New(t)

	s1, cleanupS1 := TestServer(t, nil)
	defer cleanupS1()
	state := s1.fsm.State()
	codec := rpcClient(t, s1)
	testutil.WaitForLeader(t, s1.RPC)

	// Create the policies
	p1 := mock.ScalingPolicy()
	p2 := mock.ScalingPolicy()

	// First create an unrelated policy
	time.AfterFunc(100*time.Millisecond, func() {
		err := state.UpsertScalingPolicies(100, []*structs.ScalingPolicy{p1})
		require.NoError(err)
	})

	// Upsert the policy we are watching later
	time.AfterFunc(200*time.Millisecond, func() {
		err := state.UpsertScalingPolicies(200, []*structs.ScalingPolicy{p2})
		require.NoError(err)
	})

	// Lookup the policy
	req := &structs.ScalingPolicyListRequest{
		QueryOptions: structs.QueryOptions{
			Region:        "global",
			Namespace:     "default",
			MinQueryIndex: 150,
		},
	}
	var resp structs.ScalingPolicyListResponse
	start := time.Now()
	err := msgpackrpc.CallWithCodec(codec, "Scaling.ListPolicies", req, &resp)
	require.NoError(err)

	require.True(time.Since(start) > 200*time.Millisecond, "should block: %#v", resp)
	require.EqualValues(200, resp.Index, "bad index")
	require.Len(resp.Policies, 2)
	require.ElementsMatch([]string{p1.ID, p2.ID}, []string{resp.Policies[0].ID, resp.Policies[1].ID})
}
