package xds

import (
	"path"
	"sort"
	"testing"
	"time"

	envoy "github.com/envoyproxy/go-control-plane/envoy/api/v2"
	"github.com/hashicorp/consul/agent/connect"
	"github.com/hashicorp/consul/agent/consul/discoverychain"
	"github.com/hashicorp/consul/agent/proxycfg"
	"github.com/hashicorp/consul/agent/structs"
	testinf "github.com/mitchellh/go-testing-interface"
	"github.com/stretchr/testify/require"
)

func TestRoutesFromSnapshot(t *testing.T) {

	tests := []struct {
		name   string
		create func(t testinf.T) *proxycfg.ConfigSnapshot
		// Setup is called before the test starts. It is passed the snapshot from
		// create func and is allowed to modify it in any way to setup the
		// test input.
		setup              func(snap *proxycfg.ConfigSnapshot)
		overrideGoldenName string
	}{
		{
			name:   "defaults-no-chain",
			create: proxycfg.TestConfigSnapshot,
			setup:  nil, // Default snapshot
		},
		{
			name:   "connect-proxy-with-chain",
			create: proxycfg.TestConfigSnapshotDiscoveryChain,
			setup:  nil,
		},
		{
			name:   "connect-proxy-with-chain-external-sni",
			create: proxycfg.TestConfigSnapshotDiscoveryChainExternalSNI,
			setup:  nil,
		},
		{
			name:   "connect-proxy-with-chain-and-overrides",
			create: proxycfg.TestConfigSnapshotDiscoveryChainWithOverrides,
			setup:  nil,
		},
		{
			name:   "splitter-with-resolver-redirect",
			create: proxycfg.TestConfigSnapshotDiscoveryChain_SplitterWithResolverRedirectMultiDC,
			setup:  nil,
		},
		{
			name:   "connect-proxy-with-chain-and-splitter",
			create: proxycfg.TestConfigSnapshotDiscoveryChainWithSplitter,
			setup:  nil,
		},
		{
			name:   "connect-proxy-with-grpc-router",
			create: proxycfg.TestConfigSnapshotDiscoveryChainWithGRPCRouter,
			setup:  nil,
		},
		{
			name:   "connect-proxy-with-chain-and-router",
			create: proxycfg.TestConfigSnapshotDiscoveryChainWithRouter,
			setup:  nil,
		},
		// TODO(rb): test match stanza skipped for grpc
		// Start ingress gateway test cases
		{
			name:   "ingress-defaults-no-chain",
			create: proxycfg.TestConfigSnapshotIngressGateway,
			setup:  nil, // Default snapshot
		},
		{
			name:   "ingress-with-chain",
			create: proxycfg.TestConfigSnapshotIngress,
			setup:  nil,
		},
		{
			name:   "ingress-with-chain-external-sni",
			create: proxycfg.TestConfigSnapshotIngressExternalSNI,
			setup:  nil,
		},
		{
			name:   "ingress-with-chain-and-overrides",
			create: proxycfg.TestConfigSnapshotIngressWithOverrides,
			setup:  nil,
		},
		{
			name:   "ingress-splitter-with-resolver-redirect",
			create: proxycfg.TestConfigSnapshotIngress_SplitterWithResolverRedirectMultiDC,
			setup:  nil,
		},
		{
			name:   "ingress-with-chain-and-splitter",
			create: proxycfg.TestConfigSnapshotIngressWithSplitter,
			setup:  nil,
		},
		{
			name:   "ingress-with-grpc-router",
			create: proxycfg.TestConfigSnapshotIngressWithGRPCRouter,
			setup:  nil,
		},
		{
			name:   "ingress-with-chain-and-router",
			create: proxycfg.TestConfigSnapshotIngressWithRouter,
			setup:  nil,
		},
		{
			name:   "ingress-http-multiple-services",
			create: proxycfg.TestConfigSnapshotIngress_HTTPMultipleServices,
			setup: func(snap *proxycfg.ConfigSnapshot) {
				snap.IngressGateway.Upstreams = map[proxycfg.IngressListenerKey]structs.Upstreams{
					proxycfg.IngressListenerKey{Protocol: "http", Port: 8080}: structs.Upstreams{
						{
							DestinationName: "foo",
							LocalBindPort:   8080,
							IngressHosts:    []string{"test1.example.com", "test2.example.com"},
						},
						{
							DestinationName: "bar",
							LocalBindPort:   8080,
						},
					},
					proxycfg.IngressListenerKey{Protocol: "http", Port: 443}: structs.Upstreams{
						{
							DestinationName: "baz",
							LocalBindPort:   443,
						},
						{
							DestinationName: "qux",
							LocalBindPort:   443,
						},
					},
				}

				// We do not add baz/qux here so that we test the chain.IsDefault() case
				entries := []structs.ConfigEntry{
					&structs.ProxyConfigEntry{
						Kind: structs.ProxyDefaults,
						Name: structs.ProxyConfigGlobal,
						Config: map[string]interface{}{
							"protocol": "http",
						},
					},
					&structs.ServiceResolverConfigEntry{
						Kind:           structs.ServiceResolver,
						Name:           "foo",
						ConnectTimeout: 22 * time.Second,
					},
					&structs.ServiceResolverConfigEntry{
						Kind:           structs.ServiceResolver,
						Name:           "bar",
						ConnectTimeout: 22 * time.Second,
					},
				}
				fooChain := discoverychain.TestCompileConfigEntries(t, "foo", "default", "dc1", connect.TestClusterID+".consul", "dc1", nil, entries...)
				barChain := discoverychain.TestCompileConfigEntries(t, "bar", "default", "dc1", connect.TestClusterID+".consul", "dc1", nil, entries...)
				bazChain := discoverychain.TestCompileConfigEntries(t, "baz", "default", "dc1", connect.TestClusterID+".consul", "dc1", nil, entries...)
				quxChain := discoverychain.TestCompileConfigEntries(t, "qux", "default", "dc1", connect.TestClusterID+".consul", "dc1", nil, entries...)

				snap.IngressGateway.DiscoveryChain = map[string]*structs.CompiledDiscoveryChain{
					"foo": fooChain,
					"bar": barChain,
					"baz": bazChain,
					"qux": quxChain,
				}
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			require := require.New(t)

			// Sanity check default with no overrides first
			snap := tt.create(t)

			// We need to replace the TLS certs with deterministic ones to make golden
			// files workable. Note we don't update these otherwise they'd change
			// golden files for every test case and so not be any use!
			setupTLSRootsAndLeaf(t, snap)

			if tt.setup != nil {
				tt.setup(snap)
			}

			routes, err := routesFromSnapshot(snap, "my-token")
			require.NoError(err)
			sort.Slice(routes, func(i, j int) bool {
				return routes[i].(*envoy.RouteConfiguration).Name < routes[j].(*envoy.RouteConfiguration).Name
			})
			r, err := createResponse(RouteType, "00000001", "00000001", routes)
			require.NoError(err)

			gotJSON := responseToJSON(t, r)

			gName := tt.name
			if tt.overrideGoldenName != "" {
				gName = tt.overrideGoldenName
			}

			require.JSONEq(golden(t, path.Join("routes", gName), gotJSON), gotJSON)
		})
	}
}