package service

import (
	"errors"
	"strings"
	"testing"

	"browser.local/platform/domain"
	"browser.local/platform/repo"
)

func TestCoreServiceRegistersNewRunControlSession(t *testing.T) {
	svc := newTestCoreService()

	result, err := svc.RegisterRunHello(validRunControlHello())
	if err != nil {
		t.Fatalf("register hello: %v", err)
	}
	if !result.Accepted || result.SessionToken == "" || result.HeartbeatIntervalSeconds <= 0 {
		t.Fatalf("expected accepted hello response, got %+v", result)
	}

	endpoint, err := svc.GetRunEndpoint("run-local")
	if err != nil {
		t.Fatalf("get registered endpoint: %v", err)
	}
	if endpoint.Status != domain.RunEndpointStatusOnline || !endpoint.LastHeartbeatAt.Equal(fixedTime) {
		t.Fatalf("expected online endpoint with heartbeat time, got %+v", endpoint)
	}
	if len(endpoint.Capabilities) != 2 || endpoint.Capacity.MaxJobs != 4 {
		t.Fatalf("expected capabilities and capacity, got %+v", endpoint)
	}
}

func TestCoreServiceReRegistersExistingRunEndpoint(t *testing.T) {
	svc := newTestCoreService()
	first, err := svc.RegisterRunHello(validRunControlHello())
	if err != nil {
		t.Fatalf("register first hello: %v", err)
	}

	hello := validRunControlHello()
	hello.DisplayName = "Local Run Updated"
	hello.Version = "0.2.0"
	hello.CapabilityReport.Capabilities = []string{"control.hello", "control.heartbeat", "jobs.claim"}
	hello.CapabilityReport.Fingerprint = "cap-v2"
	second, err := svc.RegisterRunHello(hello)
	if err != nil {
		t.Fatalf("register second hello: %v", err)
	}
	if second.SessionToken == first.SessionToken {
		t.Fatalf("expected re-registration to issue a new token, got %q", second.SessionToken)
	}

	endpoint, err := svc.GetRunEndpoint("run-local")
	if err != nil {
		t.Fatalf("get re-registered endpoint: %v", err)
	}
	if endpoint.DisplayName != "Local Run Updated" || endpoint.Version != "0.2.0" || len(endpoint.Capabilities) != 3 {
		t.Fatalf("expected endpoint metadata update, got %+v", endpoint)
	}
}

func TestCoreServiceAcceptsRunHeartbeat(t *testing.T) {
	svc := newTestCoreService()
	hello, err := svc.RegisterRunHello(validRunControlHello())
	if err != nil {
		t.Fatalf("register hello: %v", err)
	}

	result, err := svc.AcceptRunHeartbeat(domain.RunControlHeartbeat{
		RunEndpointID:         "run-local",
		SessionToken:          hello.SessionToken,
		Version:               "0.1.1",
		Status:                domain.RunEndpointStatusDegraded,
		CapabilityFingerprint: "cap-v1",
		Capacity:              domain.RunCapacity{MaxJobs: 4, RunningJobs: 2, QueuedJobs: 1},
	})
	if err != nil {
		t.Fatalf("accept heartbeat: %v", err)
	}
	if !result.Accepted || result.RefreshCapabilities {
		t.Fatalf("expected accepted heartbeat without refresh, got %+v", result)
	}

	endpoint, err := svc.GetRunEndpoint("run-local")
	if err != nil {
		t.Fatalf("get heartbeat endpoint: %v", err)
	}
	if endpoint.Status != domain.RunEndpointStatusDegraded || endpoint.Version != "0.1.1" || endpoint.Capacity.RunningJobs != 2 {
		t.Fatalf("expected heartbeat metadata update, got %+v", endpoint)
	}
}

func TestCoreServiceRejectsInvalidRunHeartbeatToken(t *testing.T) {
	svc := newTestCoreService()
	if _, err := svc.RegisterRunHello(validRunControlHello()); err != nil {
		t.Fatalf("register hello: %v", err)
	}

	_, err := svc.AcceptRunHeartbeat(domain.RunControlHeartbeat{
		RunEndpointID:         "run-local",
		SessionToken:          "stale-token",
		Version:               "0.1.1",
		Status:                domain.RunEndpointStatusOnline,
		CapabilityFingerprint: "cap-v1",
		Capacity:              domain.RunCapacity{MaxJobs: 4, RunningJobs: 3},
	})
	if err == nil || !strings.Contains(err.Error(), "sessionToken is invalid") {
		t.Fatalf("expected invalid token rejection, got %v", err)
	}

	endpoint, err := svc.GetRunEndpoint("run-local")
	if err != nil {
		t.Fatalf("get endpoint after rejected heartbeat: %v", err)
	}
	if endpoint.Capacity.RunningJobs != 0 || endpoint.Version != "0.1.0" {
		t.Fatalf("heartbeat with invalid token must not update endpoint, got %+v", endpoint)
	}
}

func TestCoreServiceRejectsInvalidRunControlHello(t *testing.T) {
	svc := newTestCoreService()
	invalid := validRunControlHello()
	invalid.RegistrationToken = ""
	invalid.Capacity.RunningJobs = 8

	_, err := svc.RegisterRunHello(invalid)
	if err == nil || !strings.Contains(err.Error(), "registrationToken") || !strings.Contains(err.Error(), "runningJobs") {
		t.Fatalf("expected validation errors, got %v", err)
	}
	if _, err := svc.GetRunEndpoint("run-local"); !errors.Is(err, repo.ErrNotFound) {
		t.Fatalf("invalid hello must not create endpoint, got %v", err)
	}
}

func TestCoreServiceRunHelloRejectsStalePackageKeyAfterReset(t *testing.T) {
	svc, session, instance := newDistributionTestFixture(t)
	distribution, err := svc.GenerateRunDistributionForSession(session, domain.RunDistributionGenerateRequest{
		ServerInstanceID: instance.ID,
		TargetOS:         "linux",
		TargetArch:       "amd64",
		IdempotencyKey:   "idem-control-auth",
	})
	if err != nil {
		t.Fatalf("generate run distribution: %v", err)
	}
	pkg := readGeneratedPackageConfig(t, svc, session, distribution.ArtifactID)
	hello := validRunControlHello()
	hello.RunEndpointID = instance.RunEndpointID
	hello.RegistrationToken = pkg.AuthKey
	hello.ServerInstanceID = instance.ID
	hello.PluginID = instance.PluginID
	hello.ComponentKind = domain.DistributionComponentRun
	hello.KeyGeneration = pkg.KeyGeneration

	result, err := svc.RegisterRunHello(hello)
	if err != nil {
		t.Fatalf("register current package hello: %v", err)
	}
	if !result.Accepted || result.SessionToken == "" {
		t.Fatalf("expected current package hello to be accepted, got %+v", result)
	}

	if _, err := svc.ResetComponentKeyForSession(session, domain.ComponentKeyResetRequest{
		ServerInstanceID: instance.ID,
		ComponentKind:    domain.DistributionComponentRun,
	}); err != nil {
		t.Fatalf("reset run key: %v", err)
	}
	result, err = svc.RegisterRunHello(hello)
	if err != nil {
		t.Fatalf("register stale package hello: %v", err)
	}
	if result.Accepted || result.SessionToken != "" {
		t.Fatalf("expected stale package hello to be rejected, got %+v", result)
	}
}

func TestCoreServiceRequestsCapabilityRefreshOnFingerprintDrift(t *testing.T) {
	svc := newTestCoreService()
	hello, err := svc.RegisterRunHello(validRunControlHello())
	if err != nil {
		t.Fatalf("register hello: %v", err)
	}

	result, err := svc.AcceptRunHeartbeat(domain.RunControlHeartbeat{
		RunEndpointID:         "run-local",
		SessionToken:          hello.SessionToken,
		Version:               "0.1.0",
		Status:                domain.RunEndpointStatusOnline,
		CapabilityFingerprint: "cap-v2",
		Capacity:              domain.RunCapacity{MaxJobs: 4},
	})
	if err != nil {
		t.Fatalf("accept drift heartbeat: %v", err)
	}
	if !result.RefreshCapabilities {
		t.Fatalf("expected capability refresh request, got %+v", result)
	}

	result, err = svc.AcceptRunHeartbeat(domain.RunControlHeartbeat{
		RunEndpointID:         "run-local",
		SessionToken:          hello.SessionToken,
		Version:               "0.1.0",
		Status:                domain.RunEndpointStatusOnline,
		CapabilityFingerprint: "cap-v2",
		Capacity:              domain.RunCapacity{MaxJobs: 4},
	})
	if err != nil {
		t.Fatalf("accept stable heartbeat: %v", err)
	}
	if result.RefreshCapabilities {
		t.Fatalf("expected refreshed fingerprint to become known, got %+v", result)
	}
}

func validRunControlHello() domain.RunControlHello {
	return domain.RunControlHello{
		RegistrationToken: "registration-token",
		RunEndpointID:     "run-local",
		DisplayName:       "Local Run",
		Version:           "0.1.0",
		Status:            domain.RunEndpointStatusOnline,
		Platform:          "darwin/arm64",
		CapabilityReport: domain.RunCapabilityReport{
			Capabilities: []string{"control.hello", "control.heartbeat"},
			Fingerprint:  "cap-v1",
		},
		Capacity: domain.RunCapacity{MaxJobs: 4},
	}
}