package service

import (
	"context"
	"net"
	"testing"

	toki "git.toki-labs.com/toki/proto-socket/go"
	"google.golang.org/protobuf/proto"

	edgeevents "iop/apps/edge/internal/events"
	edgenode "iop/apps/edge/internal/node"
	"iop/packages/go/config"
	iop "iop/proto/gen/iop"
)

func newUsageAttributionService(t *testing.T, providerType string) *Service {
	t.Helper()
	edgeConn, nodeConn := net.Pipe()
	t.Cleanup(func() {
		_ = edgeConn.Close()
		_ = nodeConn.Close()
	})

	parserMap := toki.ParserMap{
		toki.TypeNameOf(&iop.RunRequest{}): func(data []byte) (proto.Message, error) {
			message := &iop.RunRequest{}
			return message, proto.Unmarshal(data, message)
		},
		toki.TypeNameOf(&iop.ProviderTunnelRequest{}): func(data []byte) (proto.Message, error) {
			message := &iop.ProviderTunnelRequest{}
			return message, proto.Unmarshal(data, message)
		},
	}
	edgeClient := toki.NewTcpClient(edgeConn, 0, 0, parserMap)
	_ = toki.NewTcpClient(nodeConn, 0, 0, parserMap)

	registry := edgenode.NewRegistry()
	registry.Register(&edgenode.NodeEntry{
		NodeID:         "node-a",
		LifecycleState: edgenode.LifecycleConnected,
		Client:         edgeClient,
	})

	service := New(registry, edgeevents.NewBus())
	store := edgenode.NewNodeStore()
	store.Add(&edgenode.NodeRecord{
		ID: "node-a",
		Providers: []config.NodeProviderConf{{
			ID:       "provider-a",
			Type:     providerType,
			Models:   []string{"served-a"},
			Health:   "available",
			Capacity: 1,
		}},
	})
	service.SetNodeStore(store)
	service.SetModelCatalog([]config.ModelCatalogEntry{{
		ID:               "logical-model",
		UsageAttribution: config.UsageAttributionModelGroup,
		Providers:        map[string]string{"provider-a": "served-a"},
	}})
	return service
}

func assertUsageAttributionDispatch(
	t *testing.T,
	dispatch RunDispatch,
	providerID, target, nodeID, attribution string,
) {
	t.Helper()
	if dispatch.ProviderID != providerID {
		t.Errorf("provider_id = %q, want %q", dispatch.ProviderID, providerID)
	}
	if dispatch.Target != target {
		t.Errorf("target = %q, want %q", dispatch.Target, target)
	}
	if dispatch.NodeID != nodeID {
		t.Errorf("node_id = %q, want %q", dispatch.NodeID, nodeID)
	}
	if dispatch.UsageAttribution != attribution {
		t.Errorf("usage_attribution = %q, want %q", dispatch.UsageAttribution, attribution)
	}
}

func TestRunDispatchActualProviderBinding(t *testing.T) {
	t.Run("direct normalized", func(t *testing.T) {
		service := newUsageAttributionService(t, "ollama")
		result, err := service.SubmitRun(context.Background(), SubmitRunRequest{
			NodeRef:          "node-a",
			ProviderID:       "provider-direct",
			UsageAttribution: config.UsageAttributionProvider,
			Adapter:          "cli",
			Target:           "direct-target",
			Background:       true,
		})
		if err != nil {
			t.Fatalf("SubmitRun: %v", err)
		}
		defer result.Close()

		assertUsageAttributionDispatch(
			t,
			result.Dispatch(),
			"provider-direct",
			"direct-target",
			"node-a",
			config.UsageAttributionProvider,
		)
	})

	t.Run("provider pool normalized", func(t *testing.T) {
		service := newUsageAttributionService(t, "ollama")
		result, err := service.SubmitProviderPool(context.Background(), ProviderPoolDispatchRequest{
			Run: SubmitRunRequest{
				ModelGroupKey:    "logical-model",
				UsageAttribution: config.UsageAttributionModelGroup,
				ProviderPool:     true,
				Background:       true,
			},
		})
		if err != nil {
			t.Fatalf("SubmitProviderPool: %v", err)
		}
		if result.Path != ProviderPoolPathNormalized || result.Run == nil {
			t.Fatalf("path = %q run=%v, want normalized run", result.Path, result.Run != nil)
		}
		defer result.Run.Close()
		defer service.queue.releaseRun(result.DispatchInfo.RunID, "test-cleanup")

		assertUsageAttributionDispatch(
			t,
			result.DispatchInfo,
			"provider-a",
			"served-a",
			"node-a",
			config.UsageAttributionModelGroup,
		)
		assertUsageAttributionDispatch(
			t,
			result.Run.Dispatch(),
			"provider-a",
			"served-a",
			"node-a",
			config.UsageAttributionModelGroup,
		)
	})
}

func TestTunnelDispatchActualProviderBinding(t *testing.T) {
	t.Run("direct tunnel", func(t *testing.T) {
		service := newUsageAttributionService(t, "vllm")
		result, err := service.SubmitProviderTunnel(context.Background(), SubmitProviderTunnelRequest{
			NodeRef:          "node-a",
			ProviderID:       "provider-direct",
			UsageAttribution: config.UsageAttributionProvider,
			Adapter:          "openai_compat",
			Target:           "direct-target",
			Method:           "POST",
			Path:             "/v1/chat/completions",
		})
		if err != nil {
			t.Fatalf("SubmitProviderTunnel: %v", err)
		}
		defer result.Close()

		assertUsageAttributionDispatch(
			t,
			result.Dispatch(),
			"provider-direct",
			"direct-target",
			"node-a",
			config.UsageAttributionProvider,
		)
	})

	t.Run("provider pool tunnel", func(t *testing.T) {
		service := newUsageAttributionService(t, "vllm")
		result, err := service.SubmitProviderPool(context.Background(), ProviderPoolDispatchRequest{
			Run: SubmitRunRequest{
				ModelGroupKey:    "logical-model",
				UsageAttribution: config.UsageAttributionModelGroup,
				ProviderPool:     true,
			},
			Tunnel: SubmitProviderTunnelRequest{
				Method: "POST",
				Path:   "/v1/chat/completions",
			},
		})
		if err != nil {
			t.Fatalf("SubmitProviderPool: %v", err)
		}
		if result.Path != ProviderPoolPathTunnel || result.Tunnel == nil {
			t.Fatalf("path = %q tunnel=%v, want provider tunnel", result.Path, result.Tunnel != nil)
		}
		defer result.Tunnel.Close()

		assertUsageAttributionDispatch(
			t,
			result.DispatchInfo,
			"provider-a",
			"served-a",
			"node-a",
			config.UsageAttributionModelGroup,
		)
		assertUsageAttributionDispatch(
			t,
			result.Tunnel.Dispatch(),
			"provider-a",
			"served-a",
			"node-a",
			config.UsageAttributionModelGroup,
		)
	})
}

func TestManagedTunnelDispatchFreezesCredentialSlotAttribution(t *testing.T) {
	env := newProviderTunnelTestEnv(t)
	provider := &fakeCredentialLeaseProvider{valid: true}
	env.svc.SetCredentialLeaseProvider(provider)
	env.svc.SetCredentialLeaseLimit(1)

	dispatch := func(slot string, revision uint64) RunDispatch {
		t.Helper()
		result, err := env.svc.SubmitProviderPool(context.Background(), ProviderPoolDispatchRequest{
			Run: SubmitRunRequest{
				ModelGroupKey: "qwen3.6:35b", UsageAttribution: config.UsageAttributionProvider, ProviderPool: true,
			},
			Tunnel: SubmitProviderTunnelRequest{
				CredentialBinding: &CredentialBinding{
					PrincipalRef: "principal-one", CredentialSlotRef: slot, RouteID: "route-one", ProfileID: "openai",
					CredentialRevision: revision, RouteRevision: 3, ProjectionGeneration: 5,
				},
				Method: "POST", Path: "/v1/chat/completions", Operation: "chat_completions",
				BuildBody: func(string) ([]byte, error) { return []byte(`{"model":"served-qwen"}`), nil },
			},
		})
		if err != nil {
			t.Fatalf("SubmitProviderPool slot %q: %v", slot, err)
		}
		got := result.DispatchInfo
		if got.CredentialSlotRef != slot || got.CredentialRevision != revision {
			t.Fatalf("dispatch slot attribution = %q/%d, want %q/%d", got.CredentialSlotRef, got.CredentialRevision, slot, revision)
		}
		if tunnelGot := result.Tunnel.Dispatch(); tunnelGot.CredentialSlotRef != slot || tunnelGot.CredentialRevision != revision {
			t.Fatalf("tunnel slot attribution = %q/%d, want %q/%d", tunnelGot.CredentialSlotRef, tunnelGot.CredentialRevision, slot, revision)
		}
		result.Tunnel.Close()
		waitForCondition(t, func() bool { return inflightRunCount(env.svc.queue) == 0 }, "closing managed tunnel did not release admission")
		return got
	}

	first := dispatch("slot-a", 11)
	retry := dispatch("slot-a", 11)
	second := dispatch("slot-b", 19)
	for name, got := range map[string]RunDispatch{"first": first, "retry": retry, "second": second} {
		if got.ProviderID != "prov-vllm-01" || got.Target != "served-qwen" || got.ModelGroupKey != "qwen3.6:35b" {
			t.Fatalf("%s dispatch changed provider/model binding: %+v", name, got)
		}
	}
	if retry.CredentialSlotRef != first.CredentialSlotRef || retry.CredentialRevision != first.CredentialRevision {
		t.Fatalf("retry changed frozen credential slot: first=%+v retry=%+v", first, retry)
	}
	if second.CredentialSlotRef == first.CredentialSlotRef {
		t.Fatalf("distinct slot dispatches collapsed: first=%+v second=%+v", first, second)
	}
}