package agent

import (
	"context"
	"testing"

	mcpv1 "git.wntrmute.dev/kyle/mcp/gen/mcp/v1"
	"git.wntrmute.dev/kyle/mcp/internal/registry"
	"git.wntrmute.dev/kyle/mcp/internal/runtime"
)

func TestListServices(t *testing.T) {
	a := newTestAgent(t, &fakeRuntime{})
	ctx := context.Background()

	// Empty registry.
	resp, err := a.ListServices(ctx, &mcpv1.ListServicesRequest{})
	if err != nil {
		t.Fatalf("ListServices: %v", err)
	}
	if len(resp.Services) != 0 {
		t.Fatalf("expected 0 services, got %d", len(resp.Services))
	}

	// Add a service with components.
	if err := registry.CreateService(a.DB, "metacrypt", true); err != nil {
		t.Fatalf("create service: %v", err)
	}
	if err := registry.CreateComponent(a.DB, &registry.Component{
		Name: "api", Service: "metacrypt",
		Image: "img:v1", DesiredState: "running", ObservedState: "running",
		Version: "v1",
	}); err != nil {
		t.Fatalf("create component: %v", err)
	}
	if err := registry.CreateComponent(a.DB, &registry.Component{
		Name: "web", Service: "metacrypt",
		Image: "img-web:v1", DesiredState: "running", ObservedState: "unknown",
		Version: "v1",
	}); err != nil {
		t.Fatalf("create component: %v", err)
	}

	resp, err = a.ListServices(ctx, &mcpv1.ListServicesRequest{})
	if err != nil {
		t.Fatalf("ListServices: %v", err)
	}
	if len(resp.Services) != 1 {
		t.Fatalf("expected 1 service, got %d", len(resp.Services))
	}
	svc := resp.Services[0]
	if svc.Name != "metacrypt" || !svc.Active {
		t.Fatalf("unexpected service: %+v", svc)
	}
	if len(svc.Components) != 2 {
		t.Fatalf("expected 2 components, got %d", len(svc.Components))
	}
	if svc.Components[0].Name != "api" {
		t.Fatalf("expected first component 'api', got %q", svc.Components[0].Name)
	}
}

func TestLiveCheck(t *testing.T) {
	rt := &fakeRuntime{
		containers: []runtime.ContainerInfo{
			{Name: "metacrypt-api", Image: "img:v1", State: "running", Version: "v1"},
			{Name: "unmanaged-thing", Image: "other:latest", State: "running", Version: "latest"},
		},
	}
	a := newTestAgent(t, rt)
	ctx := context.Background()

	// Set up registry with one service and one component.
	if err := registry.CreateService(a.DB, "metacrypt", true); err != nil {
		t.Fatalf("create service: %v", err)
	}
	if err := registry.CreateComponent(a.DB, &registry.Component{
		Name: "api", Service: "metacrypt",
		Image: "img:v1", DesiredState: "running", ObservedState: "unknown",
		Version: "v1",
	}); err != nil {
		t.Fatalf("create component: %v", err)
	}
	if err := registry.CreateComponent(a.DB, &registry.Component{
		Name: "web", Service: "metacrypt",
		Image: "img-web:v1", DesiredState: "running", ObservedState: "unknown",
		Version: "v1",
	}); err != nil {
		t.Fatalf("create component: %v", err)
	}

	resp, err := a.LiveCheck(ctx, &mcpv1.LiveCheckRequest{})
	if err != nil {
		t.Fatalf("LiveCheck: %v", err)
	}

	// Should have 2 entries: the registered service and the unmanaged container.
	if len(resp.Services) != 2 {
		t.Fatalf("expected 2 service entries, got %d", len(resp.Services))
	}

	// First entry: metacrypt (registered).
	mc := resp.Services[0]
	if mc.Name != "metacrypt" {
		t.Fatalf("expected 'metacrypt', got %q", mc.Name)
	}
	if len(mc.Components) != 2 {
		t.Fatalf("expected 2 components, got %d", len(mc.Components))
	}

	// api should be running (found in runtime).
	api := mc.Components[0]
	if api.Name != "api" || api.ObservedState != "running" {
		t.Fatalf("api: expected observed_state=running, got %q", api.ObservedState)
	}

	// web should be removed (not found in runtime).
	web := mc.Components[1]
	if web.Name != "web" || web.ObservedState != "removed" {
		t.Fatalf("web: expected observed_state=removed, got %q", web.ObservedState)
	}

	// Second entry: unmanaged container.
	unmanaged := resp.Services[1]
	if unmanaged.Name != "unmanaged" {
		t.Fatalf("expected unmanaged service name 'unmanaged', got %q", unmanaged.Name)
	}
	if len(unmanaged.Components) != 1 {
		t.Fatalf("expected 1 unmanaged component, got %d", len(unmanaged.Components))
	}
	uc := unmanaged.Components[0]
	if uc.DesiredState != "ignore" {
		t.Fatalf("unmanaged desired_state: expected 'ignore', got %q", uc.DesiredState)
	}
	if uc.ObservedState != "running" {
		t.Fatalf("unmanaged observed_state: expected 'running', got %q", uc.ObservedState)
	}
}

func TestGetServiceStatus_DriftDetection(t *testing.T) {
	rt := &fakeRuntime{
		containers: []runtime.ContainerInfo{
			{Name: "metacrypt-api", Image: "img:v1", State: "exited", Version: "v1"},
		},
	}
	a := newTestAgent(t, rt)
	ctx := context.Background()

	if err := registry.CreateService(a.DB, "metacrypt", true); err != nil {
		t.Fatalf("create service: %v", err)
	}
	if err := registry.CreateComponent(a.DB, &registry.Component{
		Name: "api", Service: "metacrypt",
		Image: "img:v1", DesiredState: "running", ObservedState: "running",
		Version: "v1",
	}); err != nil {
		t.Fatalf("create component: %v", err)
	}

	// Add an event so we can verify it appears.
	if err := registry.InsertEvent(a.DB, "metacrypt", "api", "running", "exited"); err != nil {
		t.Fatalf("insert event: %v", err)
	}

	resp, err := a.GetServiceStatus(ctx, &mcpv1.GetServiceStatusRequest{Name: "metacrypt"})
	if err != nil {
		t.Fatalf("GetServiceStatus: %v", err)
	}

	if len(resp.Services) != 1 {
		t.Fatalf("expected 1 service, got %d", len(resp.Services))
	}
	if resp.Services[0].Name != "metacrypt" {
		t.Fatalf("expected 'metacrypt', got %q", resp.Services[0].Name)
	}

	// Drift: desired=running, observed=exited.
	if len(resp.Drift) != 1 {
		t.Fatalf("expected 1 drift entry, got %d", len(resp.Drift))
	}
	d := resp.Drift[0]
	if d.Service != "metacrypt" || d.Component != "api" {
		t.Fatalf("drift: unexpected service/component: %q/%q", d.Service, d.Component)
	}
	if d.DesiredState != "running" || d.ObservedState != "exited" {
		t.Fatalf("drift: desired=%q, observed=%q", d.DesiredState, d.ObservedState)
	}

	// Events.
	if len(resp.RecentEvents) != 1 {
		t.Fatalf("expected 1 event, got %d", len(resp.RecentEvents))
	}
	ev := resp.RecentEvents[0]
	if ev.PrevState != "running" || ev.NewState != "exited" {
		t.Fatalf("event: prev=%q, new=%q", ev.PrevState, ev.NewState)
	}
}

func TestGetServiceStatus_FilterByName(t *testing.T) {
	rt := &fakeRuntime{
		containers: []runtime.ContainerInfo{
			{Name: "metacrypt-api", Image: "img:v1", State: "running", Version: "v1"},
			{Name: "mcr-api", Image: "mcr:v1", State: "running", Version: "v1"},
		},
	}
	a := newTestAgent(t, rt)
	ctx := context.Background()

	for _, svc := range []string{"metacrypt", "mcr"} {
		if err := registry.CreateService(a.DB, svc, true); err != nil {
			t.Fatalf("create service %q: %v", svc, err)
		}
		if err := registry.CreateComponent(a.DB, &registry.Component{
			Name: "api", Service: svc,
			Image: svc + ":v1", DesiredState: "running", ObservedState: "unknown",
			Version: "v1",
		}); err != nil {
			t.Fatalf("create component for %q: %v", svc, err)
		}
	}

	resp, err := a.GetServiceStatus(ctx, &mcpv1.GetServiceStatusRequest{Name: "mcr"})
	if err != nil {
		t.Fatalf("GetServiceStatus: %v", err)
	}
	if len(resp.Services) != 1 {
		t.Fatalf("expected 1 service, got %d", len(resp.Services))
	}
	if resp.Services[0].Name != "mcr" {
		t.Fatalf("expected 'mcr', got %q", resp.Services[0].Name)
	}
}

func TestGetServiceStatus_IgnoreSkipsDrift(t *testing.T) {
	rt := &fakeRuntime{
		containers: []runtime.ContainerInfo{
			{Name: "random-thing", Image: "img:v1", State: "running", Version: "v1"},
		},
	}
	a := newTestAgent(t, rt)
	ctx := context.Background()

	// No registered services, only an unmanaged container.
	resp, err := a.GetServiceStatus(ctx, &mcpv1.GetServiceStatusRequest{})
	if err != nil {
		t.Fatalf("GetServiceStatus: %v", err)
	}

	// The unmanaged container should not appear in drift.
	if len(resp.Drift) != 0 {
		t.Fatalf("expected 0 drift entries for unmanaged, got %d", len(resp.Drift))
	}
}

func TestSplitContainerName(t *testing.T) {
	tests := []struct {
		name    string
		service string
		comp    string
	}{
		{"metacrypt-api", "metacrypt", "api"},
		{"metacrypt-web-ui", "metacrypt", "web-ui"},
		{"standalone", "standalone", "standalone"},
	}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			svc, comp := splitContainerName(tt.name)
			if svc != tt.service || comp != tt.comp {
				t.Fatalf("splitContainerName(%q) = (%q, %q), want (%q, %q)",
					tt.name, svc, comp, tt.service, tt.comp)
			}
		})
	}
}