package discoverychain

import (
	"testing"
	"time"

	"github.com/hashicorp/consul/agent/structs"
	"github.com/stretchr/testify/require"
)

func TestCompile_NoEntries_NoInferDefaults(t *testing.T) {
	entries := newEntries()

	res, err := Compile(CompileRequest{
		ServiceName:       "main",
		CurrentNamespace:  "default",
		CurrentDatacenter: "dc1",
		InferDefaults:     false,
		Entries:           entries,
	})
	require.NoError(t, err)
	require.Nil(t, res)
}

type compileTestCase struct {
	entries *structs.DiscoveryChainConfigEntries
	// expect: the GroupResolverNodes map should have nil values
	expect *structs.CompiledDiscoveryChain
	// expectIsDefault tests behavior of CompiledDiscoveryChain.IsDefault()
	expectIsDefault bool
	expectErr       string
	expectGraphErr  bool
}

func TestCompile(t *testing.T) {
	t.Parallel()

	// TODO(rb): test circular dependency?
	cases := map[string]compileTestCase{
		"router with defaults":                             testcase_JustRouterWithDefaults(),
		"router with defaults and resolver":                testcase_RouterWithDefaults_NoSplit_WithResolver(),
		"router with defaults and noop split":              testcase_RouterWithDefaults_WithNoopSplit_DefaultResolver(),
		"router with defaults and noop split and resolver": testcase_RouterWithDefaults_WithNoopSplit_WithResolver(),
		"route bypasses splitter":                          testcase_RouteBypassesSplit(),
		"noop split":                                       testcase_NoopSplit_DefaultResolver(),
		"noop split with protocol from proxy defaults":     testcase_NoopSplit_DefaultResolver_ProtocolFromProxyDefaults(),
		"noop split with resolver":                         testcase_NoopSplit_WithResolver(),
		"subset split":                                     testcase_SubsetSplit(),
		"service split":                                    testcase_ServiceSplit(),
		"split bypasses next splitter":                     testcase_SplitBypassesSplit(),
		"service redirect":                                 testcase_ServiceRedirect(),
		"service and subset redirect":                      testcase_ServiceAndSubsetRedirect(),
		"datacenter redirect":                              testcase_DatacenterRedirect(),
		"service failover":                                 testcase_ServiceFailover(),
		"service and subset failover":                      testcase_ServiceAndSubsetFailover(),
		"datacenter failover":                              testcase_DatacenterFailover(),
		"noop split to resolver with default subset":       testcase_NoopSplit_WithDefaultSubset(),
		"resolver with default subset":                     testcase_Resolve_WithDefaultSubset(),
		"resolver with no entries and inferring defaults":  testcase_DefaultResolver(),
		"default resolver with proxy defaults":             testcase_DefaultResolver_WithProxyDefaults(),
		"service redirect to service with default resolver is not a default chain": testcase_RedirectToDefaultResolverIsNotDefaultChain(),

		// TODO(rb): handle this case better: "circular split":                                   testcase_CircularSplit(),
		"all the bells and whistles": testcase_AllBellsAndWhistles(),
		"multi dc canary":            testcase_MultiDatacenterCanary(),

		// various errors
		"splitter requires valid protocol": testcase_SplitterRequiresValidProtocol(),
		"router requires valid protocol":   testcase_RouterRequiresValidProtocol(),
		"split to unsplittable protocol":   testcase_SplitToUnsplittableProtocol(),
		"route to unroutable protocol":     testcase_RouteToUnroutableProtocol(),
		"failover crosses protocols":       testcase_FailoverCrossesProtocols(),
		"redirect crosses protocols":       testcase_RedirectCrossesProtocols(),
		"redirect to missing subset":       testcase_RedirectToMissingSubset(),
	}

	for name, tc := range cases {
		tc := tc
		t.Run(name, func(t *testing.T) {
			t.Parallel()

			// sanity check entries are normalized and valid
			for _, entry := range tc.entries.Routers {
				require.NoError(t, entry.Normalize())
				require.NoError(t, entry.Validate())
			}
			for _, entry := range tc.entries.Splitters {
				require.NoError(t, entry.Normalize())
				require.NoError(t, entry.Validate())
			}
			for _, entry := range tc.entries.Resolvers {
				require.NoError(t, entry.Normalize())
				require.NoError(t, entry.Validate())
			}

			res, err := Compile(CompileRequest{
				ServiceName:       "main",
				CurrentNamespace:  "default",
				CurrentDatacenter: "dc1",
				InferDefaults:     true,
				Entries:           tc.entries,
			})
			if tc.expectErr != "" {
				require.Error(t, err)
				require.Contains(t, err.Error(), tc.expectErr)
				_, ok := err.(*structs.ConfigEntryGraphError)
				if tc.expectGraphErr {
					require.True(t, ok, "%T is not a *ConfigEntryGraphError", err)
				} else {
					require.False(t, ok, "did not expect a *ConfigEntryGraphError here: %v", err)
				}
			} else {
				require.NoError(t, err)

				// Avoid requiring unnecessary test boilerplate and inject these
				// ourselves.
				tc.expect.ServiceName = "main"
				tc.expect.Namespace = "default"
				tc.expect.Datacenter = "dc1"

				// These nodes are duplicated elsewhere in the results, so we only
				// care that the keys are present. Walk the results and nil out the
				// value payloads so that the require.Equal will still do the work
				// for us.
				if len(res.GroupResolverNodes) > 0 {
					for target, _ := range res.GroupResolverNodes {
						res.GroupResolverNodes[target] = nil
					}
				}

				require.Equal(t, tc.expect, res)
				require.Equal(t, tc.expectIsDefault, res.IsDefault())
			}
		})
	}
}

func testcase_JustRouterWithDefaults() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
		},
	)

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							Default:        true,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_RouterWithDefaults_NoSplit_WithResolver() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:           "service-resolver",
			Name:           "main",
			ConnectTimeout: 33 * time.Second,
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 33 * time.Second,
							Target:         newTarget("main", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_RouterWithDefaults_WithNoopSplit_DefaultResolver() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
		},
	)
	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeSplitter,
						Name: "main",
						Splits: []*structs.DiscoverySplit{
							{
								Weight: 100,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolver,
										Default:        true,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("main", "", "default", "dc1"),
									},
								},
							},
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_NoopSplit_DefaultResolver_ProtocolFromProxyDefaults() compileTestCase {
	entries := newEntries()
	setGlobalProxyProtocol(entries, "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
		},
	)
	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeSplitter,
						Name: "main",
						Splits: []*structs.DiscoverySplit{
							{
								Weight: 100,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolver,
										Default:        true,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("main", "", "default", "dc1"),
									},
								},
							},
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_RouterWithDefaults_WithNoopSplit_WithResolver() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
		},
	)
	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:           "service-resolver",
			Name:           "main",
			ConnectTimeout: 33 * time.Second,
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeSplitter,
						Name: "main",
						Splits: []*structs.DiscoverySplit{
							{
								Weight: 100,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolver,
										ConnectTimeout: 33 * time.Second,
										Target:         newTarget("main", "", "default", "dc1"),
									},
								},
							},
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_RouteBypassesSplit() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "other", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
			Routes: []structs.ServiceRoute{
				// route direct subset reference (bypass split)
				newSimpleRoute("other", func(r *structs.ServiceRoute) {
					r.Destination.ServiceSubset = "bypass"
				}),
			},
		},
	)
	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "other",
			Splits: []structs.ServiceSplit{
				{Weight: 100, Service: "ignored"},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "other",
			Subsets: map[string]structs.ServiceResolverSubset{
				"bypass": {
					Filter: "Service.Meta.version == bypass",
				},
			},
		},
	)

	router := entries.GetRouter("main")

	resolverOther := entries.GetResolver("other")
	resolverMain := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: &router.Routes[0],
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "other",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverOther,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("other", "bypass", "default", "dc1"),
						},
					},
				},
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverMain,
							Default:        true,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"other": resolverOther,
			"main":  resolverMain,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
			newTarget("other", "bypass", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"):        nil,
			newTarget("other", "bypass", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_NoopSplit_DefaultResolver() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 100,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							Default:        true,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_NoopSplit_WithResolver() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:           "service-resolver",
			Name:           "main",
			ConnectTimeout: 33 * time.Second,
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 100,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 33 * time.Second,
							Target:         newTarget("main", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_SubsetSplit() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 60, ServiceSubset: "v2"},
				{Weight: 40, ServiceSubset: "v1"},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Subsets: map[string]structs.ServiceResolverSubset{
				"v1": {
					Filter: "Service.Meta.version == 1",
				},
				"v2": {
					Filter: "Service.Meta.version == 2",
				},
			},
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 60,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "v2", "default", "dc1"),
						},
					},
				},
				{
					Weight: 40,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "v1", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "v1", "default", "dc1"),
			newTarget("main", "v2", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "v1", "default", "dc1"): nil,
			newTarget("main", "v2", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_ServiceSplit() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "foo", "http")
	setServiceProtocol(entries, "bar", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 60, Service: "foo"},
				{Weight: 40, Service: "bar"},
			},
		},
	)

	resolverFoo := newDefaultServiceResolver("foo")
	resolverBar := newDefaultServiceResolver("bar")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 60,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "foo",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverFoo,
							Default:        true,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("foo", "", "default", "dc1"),
						},
					},
				},
				{
					Weight: 40,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "bar",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverBar,
							Default:        true,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("bar", "", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"foo": resolverFoo,
			"bar": resolverBar,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("bar", "", "default", "dc1"),
			newTarget("foo", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("bar", "", "default", "dc1"): nil,
			newTarget("foo", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_SplitBypassesSplit() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "next", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{
					Weight:        100,
					Service:       "next",
					ServiceSubset: "bypassed",
				},
			},
		},
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "next",
			Splits: []structs.ServiceSplit{
				{
					Weight:        100,
					ServiceSubset: "not-bypassed",
				},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "next",
			Subsets: map[string]structs.ServiceResolverSubset{
				"bypassed": {
					Filter: "Service.Meta.version == bypass",
				},
				"not-bypassed": {
					Filter: "Service.Meta.version != bypass",
				},
			},
		},
	)

	resolverNext := entries.GetResolver("next")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 100,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "next",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverNext,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("next", "bypassed", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"next": resolverNext,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("next", "bypassed", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("next", "bypassed", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_ServiceRedirect() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Service: "other",
			},
		},
	)

	resolverOther := newDefaultServiceResolver("other")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "other",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolverOther,
				Default:        true,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("other", "", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"other": resolverOther,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("other", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("other", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect}
}

func testcase_ServiceAndSubsetRedirect() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Service:       "other",
				ServiceSubset: "v2",
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "other",
			Subsets: map[string]structs.ServiceResolverSubset{
				"v1": {
					Filter: "Service.Meta.version == 1",
				},
				"v2": {
					Filter: "Service.Meta.version == 2",
				},
			},
		},
	)

	resolver := entries.GetResolver("other")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "other",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("other", "v2", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"other": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("other", "v2", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("other", "v2", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_DatacenterRedirect() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Datacenter: "dc9",
			},
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "", "default", "dc9"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc9"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc9"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_ServiceFailover() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Failover: map[string]structs.ServiceResolverFailover{
				"*": {Service: "backup"},
			},
		},
	)

	resolverMain := entries.GetResolver("main")
	resolverBackup := newDefaultServiceResolver("backup")

	wildFail := resolverMain.Failover["*"]

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolverMain,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "", "default", "dc1"),
				Failover: &structs.DiscoveryFailover{
					Definition: &wildFail,
					Targets: []structs.DiscoveryTarget{
						newTarget("backup", "", "default", "dc1"),
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main":   resolverMain,
			"backup": resolverBackup,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("backup", "", "default", "dc1"),
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_ServiceAndSubsetFailover() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Subsets: map[string]structs.ServiceResolverSubset{
				"backup": {
					Filter: "Service.Meta.version == backup",
				},
			},
			Failover: map[string]structs.ServiceResolverFailover{
				"*": {ServiceSubset: "backup"},
			},
		},
	)

	resolver := entries.GetResolver("main")
	wildFail := resolver.Failover["*"]

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "", "default", "dc1"),
				Failover: &structs.DiscoveryFailover{
					Definition: &wildFail,
					Targets: []structs.DiscoveryTarget{
						newTarget("main", "backup", "default", "dc1"),
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
			newTarget("main", "backup", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_DatacenterFailover() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main",
			Failover: map[string]structs.ServiceResolverFailover{
				"*": {Datacenters: []string{"dc2", "dc4"}},
			},
		},
	)

	resolver := entries.GetResolver("main")
	wildFail := resolver.Failover["*"]

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "", "default", "dc1"),
				Failover: &structs.DiscoveryFailover{
					Definition: &wildFail,
					Targets: []structs.DiscoveryTarget{
						newTarget("main", "", "default", "dc2"),
						newTarget("main", "", "default", "dc4"),
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
			newTarget("main", "", "default", "dc2"),
			newTarget("main", "", "default", "dc4"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_NoopSplit_WithDefaultSubset() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 100},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:          "service-resolver",
			Name:          "main",
			DefaultSubset: "v2",
			Subsets: map[string]structs.ServiceResolverSubset{
				"v1": {Filter: "Service.Meta.version == 1"},
				"v2": {Filter: "Service.Meta.version == 2"},
			},
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 100,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "v2", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "v2", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "v2", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_DefaultResolver() compileTestCase {
	entries := newEntries()

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				Default:        true,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect, expectIsDefault: true}
}

func testcase_DefaultResolver_WithProxyDefaults() compileTestCase {
	entries := newEntries()
	entries.GlobalProxy = &structs.ProxyConfigEntry{
		Kind: structs.ProxyDefaults,
		Name: structs.ProxyConfigGlobal,
		Config: map[string]interface{}{
			"protocol": "grpc",
		},
		MeshGateway: structs.MeshGatewayConfig{
			Mode: structs.MeshGatewayModeRemote,
		},
	}

	resolver := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "grpc",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				Default:        true,
				ConnectTimeout: 5 * time.Second,
				MeshGateway: structs.MeshGatewayConfig{
					Mode: structs.MeshGatewayModeRemote,
				},
				Target: newTarget("main", "", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect, expectIsDefault: true}
}

func testcase_RedirectToDefaultResolverIsNotDefaultChain() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: structs.ServiceResolver,
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Service: "other",
			},
		},
	)

	resolver := newDefaultServiceResolver("other")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "other",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				Default:        true,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("other", "", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"other": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("other", "", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("other", "", "default", "dc1"): nil,
		},
	}

	return compileTestCase{entries: entries, expect: expect, expectIsDefault: false /*being explicit here because this is the whole point of this test*/}
}

func testcase_Resolve_WithDefaultSubset() compileTestCase {
	entries := newEntries()
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:          "service-resolver",
			Name:          "main",
			DefaultSubset: "v2",
			Subsets: map[string]structs.ServiceResolverSubset{
				"v1": {Filter: "Service.Meta.version == 1"},
				"v2": {Filter: "Service.Meta.version == 2"},
			},
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "tcp",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeGroupResolver,
			Name: "main",
			GroupResolver: &structs.DiscoveryGroupResolver{
				Definition:     resolver,
				ConnectTimeout: 5 * time.Second,
				Target:         newTarget("main", "v2", "default", "dc1"),
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "v2", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "v2", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_CircularSplit() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "other", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 60, Service: "other"},
				{Weight: 40, Service: "main"}, // goes straight to resolver
			},
		},
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "other",
			Splits: []structs.ServiceSplit{
				{Weight: 60, Service: "main"},
				{Weight: 40, Service: "other"}, // goes straight to resolver
			},
		},
	)

	resolveMain := newDefaultServiceResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 60,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolveMain,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "v2", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolveMain,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "v2", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "v2", "default", "dc1"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_MultiDatacenterCanary() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "main-dc2", "http")
	setServiceProtocol(entries, "main-dc3", "http")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 60, Service: "main-dc2"},
				{Weight: 40, Service: "main-dc3"},
			},
		},
	)
	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main-dc2",
			Redirect: &structs.ServiceResolverRedirect{
				Service:    "main",
				Datacenter: "dc2",
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "main-dc3",
			Redirect: &structs.ServiceResolverRedirect{
				Service:    "main",
				Datacenter: "dc3",
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind:           "service-resolver",
			Name:           "main",
			ConnectTimeout: 33 * time.Second,
		},
	)

	resolver := entries.GetResolver("main")

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeSplitter,
			Name: "main",
			Splits: []*structs.DiscoverySplit{
				{
					Weight: 60,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 33 * time.Second,
							Target:         newTarget("main", "", "default", "dc2"),
						},
					},
				},
				{
					Weight: 40,
					Node: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolver,
							ConnectTimeout: 33 * time.Second,
							Target:         newTarget("main", "", "default", "dc3"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main": resolver,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "", "default", "dc2"),
			newTarget("main", "", "default", "dc3"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "", "default", "dc2"): nil,
			newTarget("main", "", "default", "dc3"): nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_AllBellsAndWhistles() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "http")
	setServiceProtocol(entries, "svc-redirect", "http")
	setServiceProtocol(entries, "svc-redirect-again", "http")
	setServiceProtocol(entries, "svc-split", "http")
	setServiceProtocol(entries, "svc-split-again", "http")
	setServiceProtocol(entries, "svc-split-one-more-time", "http")
	setServiceProtocol(entries, "redirected", "http")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: "service-router",
			Name: "main",
			Routes: []structs.ServiceRoute{
				newSimpleRoute("svc-redirect"), // double redirected to a default subset
				newSimpleRoute("svc-split"),    // one split is split further
			},
		},
	)
	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "svc-split",
			Splits: []structs.ServiceSplit{
				{Weight: 60, Service: "svc-redirect"},    // double redirected to a default subset
				{Weight: 40, Service: "svc-split-again"}, // split again
			},
		},
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "svc-split-again",
			Splits: []structs.ServiceSplit{
				{Weight: 75, Service: "main", ServiceSubset: "v1"},
				{Weight: 25, Service: "svc-split-one-more-time"},
			},
		},
		&structs.ServiceSplitterConfigEntry{
			Kind: "service-splitter",
			Name: "svc-split-one-more-time",
			Splits: []structs.ServiceSplit{
				{Weight: 80, Service: "main", ServiceSubset: "v2"},
				{Weight: 20, Service: "main", ServiceSubset: "v3"},
			},
		},
	)

	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "svc-redirect",
			Redirect: &structs.ServiceResolverRedirect{
				Service: "svc-redirect-again",
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind: "service-resolver",
			Name: "svc-redirect-again",
			Redirect: &structs.ServiceResolverRedirect{
				Service: "redirected",
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind:          "service-resolver",
			Name:          "redirected",
			DefaultSubset: "prod",
			Subsets: map[string]structs.ServiceResolverSubset{
				"prod": {Filter: "ServiceMeta.env == prod"},
				"qa":   {Filter: "ServiceMeta.env == qa"},
			},
		},
		&structs.ServiceResolverConfigEntry{
			Kind:          "service-resolver",
			Name:          "main",
			DefaultSubset: "default-subset",
			Subsets: map[string]structs.ServiceResolverSubset{
				"v1":             {Filter: "Service.Meta.version == 1"},
				"v2":             {Filter: "Service.Meta.version == 2"},
				"v3":             {Filter: "Service.Meta.version == 3"},
				"default-subset": {OnlyPassing: true},
			},
		},
	)

	var (
		router             = entries.GetRouter("main")
		resolverMain       = entries.GetResolver("main")
		resolverRedirected = entries.GetResolver("redirected")
	)

	expect := &structs.CompiledDiscoveryChain{
		Protocol: "http",
		Node: &structs.DiscoveryGraphNode{
			Type: structs.DiscoveryGraphNodeTypeRouter,
			Name: "main",
			Routes: []*structs.DiscoveryRoute{
				{
					Definition: &router.Routes[0],
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "redirected",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverRedirected,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("redirected", "prod", "default", "dc1"),
						},
					},
				},
				{
					Definition: &router.Routes[1],
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeSplitter,
						Name: "svc-split",
						Splits: []*structs.DiscoverySplit{
							{
								Weight: 60,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "redirected",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolverRedirected,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("redirected", "prod", "default", "dc1"),
									},
								},
							},
							{
								Weight: 30,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolverMain,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("main", "v1", "default", "dc1"),
									},
								},
							},
							{
								Weight: 8,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolverMain,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("main", "v2", "default", "dc1"),
									},
								},
							},
							{
								Weight: 2,
								Node: &structs.DiscoveryGraphNode{
									Type: structs.DiscoveryGraphNodeTypeGroupResolver,
									Name: "main",
									GroupResolver: &structs.DiscoveryGroupResolver{
										Definition:     resolverMain,
										ConnectTimeout: 5 * time.Second,
										Target:         newTarget("main", "v3", "default", "dc1"),
									},
								},
							},
						},
					},
				},
				{
					Definition: newDefaultServiceRoute("main"),
					DestinationNode: &structs.DiscoveryGraphNode{
						Type: structs.DiscoveryGraphNodeTypeGroupResolver,
						Name: "main",
						GroupResolver: &structs.DiscoveryGroupResolver{
							Definition:     resolverMain,
							ConnectTimeout: 5 * time.Second,
							Target:         newTarget("main", "default-subset", "default", "dc1"),
						},
					},
				},
			},
		},
		Resolvers: map[string]*structs.ServiceResolverConfigEntry{
			"main":       resolverMain,
			"redirected": resolverRedirected,
		},
		Targets: []structs.DiscoveryTarget{
			newTarget("main", "default-subset", "default", "dc1"),
			newTarget("main", "v1", "default", "dc1"),
			newTarget("main", "v2", "default", "dc1"),
			newTarget("main", "v3", "default", "dc1"),
			newTarget("redirected", "prod", "default", "dc1"),
		},
		GroupResolverNodes: map[structs.DiscoveryTarget]*structs.DiscoveryGraphNode{
			newTarget("main", "default-subset", "default", "dc1"): nil,
			newTarget("main", "v1", "default", "dc1"):             nil,
			newTarget("main", "v2", "default", "dc1"):             nil,
			newTarget("main", "v3", "default", "dc1"):             nil,
			newTarget("redirected", "prod", "default", "dc1"):     nil,
		},
	}
	return compileTestCase{entries: entries, expect: expect}
}

func testcase_SplitterRequiresValidProtocol() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "tcp")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: structs.ServiceSplitter,
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 90, Namespace: "v1"},
				{Weight: 10, Namespace: "v2"},
			},
		},
	)

	return compileTestCase{
		entries:        entries,
		expectErr:      "does not permit advanced routing or splitting behavior",
		expectGraphErr: true,
	}
}

func testcase_RouterRequiresValidProtocol() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "tcp")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: structs.ServiceRouter,
			Name: "main",
			Routes: []structs.ServiceRoute{
				{
					Match: &structs.ServiceRouteMatch{
						HTTP: &structs.ServiceRouteHTTPMatch{
							PathExact: "/other",
						},
					},
					Destination: &structs.ServiceRouteDestination{
						Namespace: "other",
					},
				},
			},
		},
	)
	return compileTestCase{
		entries:        entries,
		expectErr:      "does not permit advanced routing or splitting behavior",
		expectGraphErr: true,
	}
}

func testcase_SplitToUnsplittableProtocol() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "tcp")
	setServiceProtocol(entries, "other", "tcp")

	entries.AddSplitters(
		&structs.ServiceSplitterConfigEntry{
			Kind: structs.ServiceSplitter,
			Name: "main",
			Splits: []structs.ServiceSplit{
				{Weight: 90},
				{Weight: 10, Service: "other"},
			},
		},
	)
	return compileTestCase{
		entries:        entries,
		expectErr:      "does not permit advanced routing or splitting behavior",
		expectGraphErr: true,
	}
}

func testcase_RouteToUnroutableProtocol() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "tcp")
	setServiceProtocol(entries, "other", "tcp")

	entries.AddRouters(
		&structs.ServiceRouterConfigEntry{
			Kind: structs.ServiceRouter,
			Name: "main",
			Routes: []structs.ServiceRoute{
				{
					Match: &structs.ServiceRouteMatch{
						HTTP: &structs.ServiceRouteHTTPMatch{
							PathExact: "/other",
						},
					},
					Destination: &structs.ServiceRouteDestination{
						Service: "other",
					},
				},
			},
		},
	)

	return compileTestCase{
		entries:        entries,
		expectErr:      "does not permit advanced routing or splitting behavior",
		expectGraphErr: true,
	}
}

func testcase_FailoverCrossesProtocols() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "grpc")
	setServiceProtocol(entries, "other", "tcp")

	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: structs.ServiceResolver,
			Name: "main",
			Failover: map[string]structs.ServiceResolverFailover{
				"*": structs.ServiceResolverFailover{
					Service: "other",
				},
			},
		},
	)

	return compileTestCase{
		entries:        entries,
		expectErr:      "uses inconsistent protocols",
		expectGraphErr: true,
	}
}

func testcase_RedirectCrossesProtocols() compileTestCase {
	entries := newEntries()
	setServiceProtocol(entries, "main", "grpc")
	setServiceProtocol(entries, "other", "tcp")

	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind: structs.ServiceResolver,
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Service: "other",
			},
		},
	)
	return compileTestCase{
		entries:        entries,
		expectErr:      "uses inconsistent protocols",
		expectGraphErr: true,
	}
}

func testcase_RedirectToMissingSubset() compileTestCase {
	entries := newEntries()

	entries.AddResolvers(
		&structs.ServiceResolverConfigEntry{
			Kind:           structs.ServiceResolver,
			Name:           "other",
			ConnectTimeout: 33 * time.Second,
		},
		&structs.ServiceResolverConfigEntry{
			Kind: structs.ServiceResolver,
			Name: "main",
			Redirect: &structs.ServiceResolverRedirect{
				Service:       "other",
				ServiceSubset: "v1",
			},
		},
	)

	return compileTestCase{
		entries:        entries,
		expectErr:      `does not have a subset named "v1"`,
		expectGraphErr: true,
	}
}

func newSimpleRoute(name string, muts ...func(*structs.ServiceRoute)) structs.ServiceRoute {
	r := structs.ServiceRoute{
		Match: &structs.ServiceRouteMatch{
			HTTP: &structs.ServiceRouteHTTPMatch{PathPrefix: "/" + name},
		},
		Destination: &structs.ServiceRouteDestination{Service: name},
	}

	for _, mut := range muts {
		mut(&r)
	}

	return r
}

func setGlobalProxyProtocol(entries *structs.DiscoveryChainConfigEntries, protocol string) {
	entries.GlobalProxy = &structs.ProxyConfigEntry{
		Kind: structs.ProxyDefaults,
		Name: structs.ProxyConfigGlobal,
		Config: map[string]interface{}{
			"protocol": protocol,
		},
	}
}

func setServiceProtocol(entries *structs.DiscoveryChainConfigEntries, name, protocol string) {
	entries.AddServices(&structs.ServiceConfigEntry{
		Kind:     structs.ServiceDefaults,
		Name:     name,
		Protocol: protocol,
	})
}

func newEntries() *structs.DiscoveryChainConfigEntries {
	return &structs.DiscoveryChainConfigEntries{
		Routers:   make(map[string]*structs.ServiceRouterConfigEntry),
		Splitters: make(map[string]*structs.ServiceSplitterConfigEntry),
		Resolvers: make(map[string]*structs.ServiceResolverConfigEntry),
	}
}

func newTarget(service, serviceSubset, namespace, datacenter string) structs.DiscoveryTarget {
	return structs.DiscoveryTarget{
		Service:       service,
		ServiceSubset: serviceSubset,
		Namespace:     namespace,
		Datacenter:    datacenter,
	}
}