// SPDX-License-Identifier: LicenseRef-DDI-Proprietary

package agentapi

import (
	"net/netip"
	"strconv"
	"testing"
	"time"

	"google.golang.org/grpc/codes"
	"google.golang.org/protobuf/types/known/timestamppb"

	agentv1 "git.beugsiud.de/beug.k/DDI/proto/gen/ddi/agent/v1"
	"git.beugsiud.de/beug.k/DDI/server/internal/ipam"
	"git.beugsiud.de/beug.k/DDI/server/internal/service"
)

// connect opens a stream, sends Hello and returns the Welcome.
func connect(t *testing.T, a *testAgent, applied uint64) (agentv1.AgentService_ConnectClient, *agentv1.Welcome) {
	t.Helper()
	stream, err := a.client.Connect(ctxT(t))
	if err != nil {
		t.Fatal(err)
	}
	if err := stream.Send(&agentv1.ConnectRequest{Message: &agentv1.ConnectRequest_Hello{Hello: &agentv1.Hello{
		AppliedRevision: applied, LastGoodRevision: applied}}}); err != nil {
		t.Fatal(err)
	}
	msg, err := stream.Recv()
	if err != nil || msg.GetWelcome() == nil {
		t.Fatalf("welcome %v %v", msg, err)
	}
	return stream, msg.GetWelcome()
}

func TestPushModesAndReports(t *testing.T) {
	e := newTestEnv(t)
	ctx := ctxT(t)
	a := e.enroll("dns")
	e.configureGenerator(3600)
	if _, _, err := e.svc.CreateRevision(ctx, service.SystemActor, ""); err != nil {
		t.Fatal(err)
	}
	if ag, err := e.svc.SetAgentMode(ctx, service.SystemActor, a.id, "manual"); err != nil || ag.TargetRevision != 1 {
		t.Fatalf("mode %+v %v", ag, err)
	}

	// A push while the agent is offline is announced by polling ...
	targets, err := e.svc.DeployRevision(ctx, service.SystemActor, 1, []string{a.id})
	if err != nil || len(targets) != 1 || targets[0].Sent {
		t.Fatalf("deploy %+v %v", targets, err)
	}
	id := strconv.FormatInt(targets[0].DeploymentID, 10)
	st, err := a.client.GetDesiredState(ctx, &agentv1.GetDesiredStateRequest{})
	if err != nil || st.GetDeploymentId() != id || st.GetDesiredRevision() != 1 || st.GetMode() != agentv1.OperatingMode_OPERATING_MODE_MANUAL {
		t.Fatalf("desired state %v %v", st, err)
	}
	// ... and sent again when it connects.
	stream, w := connect(t, a, 0)
	if w.GetMode() != agentv1.OperatingMode_OPERATING_MODE_MANUAL || w.GetDesiredRevision() != 1 {
		t.Errorf("welcome %v", w)
	}
	msg, err := stream.Recv()
	if err != nil || msg.GetCommand().GetApplyRevision().GetRevision() != 1 || msg.GetCommand().GetApplyRevision().GetDeploymentId() != id {
		t.Fatalf("pending push %v %v", msg, err)
	}

	// The report completes the deployment; it is not announced any more and
	// a resent report is accepted without changes.
	report := &agentv1.ReportDeploymentRequest{DeploymentId: id, Revision: 1,
		Trigger: agentv1.DeploymentTrigger_DEPLOYMENT_TRIGGER_PUSH, Outcome: agentv1.DeploymentOutcome_DEPLOYMENT_OUTCOME_SUCCEEDED,
		ActiveRevision: 1, StartedAt: timestamppb.New(time.Now().Add(-time.Second)), FinishedAt: timestamppb.Now()}
	for range 2 {
		if _, err := a.client.ReportDeployment(ctx, report); err != nil {
			t.Fatal(err)
		}
	}
	deps, err := e.svc.ListDeployments(ctx, service.DeploymentFilter{AgentID: a.id})
	if err != nil || len(deps.Items) != 1 || deps.Items[0].Outcome != "succeeded" || deps.Items[0].FinishedAt == nil ||
		deps.Items[0].RequestedByName != "system" {
		t.Fatalf("deployments %+v %v", deps, err)
	}
	if st, err := a.client.GetDesiredState(ctx, &agentv1.GetDesiredStateRequest{}); err != nil || st.GetDeploymentId() != "" {
		t.Errorf("desired state after report %v %v", st, err)
	}

	// A manual agent gets no new revisions, but a push while connected.
	var netID string
	if err := e.st.Pool().QueryRow(ctx, `SELECT id FROM networks`).Scan(&netID); err != nil {
		t.Fatal(err)
	}
	if _, err := e.svc.CreateAddress(ctx, service.SystemActor, service.AddressInput{NetworkID: netID,
		IP: netip.MustParseAddr("192.0.2.10"), Type: ipam.TypeStatic, Hostname: "www"}); err != nil {
		t.Fatal(err)
	}
	if rev, created, err := e.svc.CreateRevision(ctx, service.SystemActor, ""); err != nil || !created || rev.Number != 2 {
		t.Fatalf("revision 2 %+v %v %v", rev, created, err)
	}
	targets, err = e.svc.DeployRevision(ctx, service.SystemActor, 2, nil)
	if err != nil || len(targets) != 1 || !targets[0].Sent {
		t.Fatalf("push %+v %v", targets, err)
	}
	msg, err = stream.Recv()
	if err != nil || msg.GetCommand().GetApplyRevision().GetRevision() != 2 ||
		msg.GetCommand().GetApplyRevision().GetDeploymentId() != strconv.FormatInt(targets[0].DeploymentID, 10) {
		t.Fatalf("push command %v %v", msg, err)
	}

	// A mode change reconnects the agent with the new mode.
	if _, err := e.svc.SetAgentMode(ctx, service.SystemActor, a.id, "auto_pull"); err != nil {
		t.Fatal(err)
	}
	_, err = stream.Recv()
	wantCode(t, err, codes.Unavailable)
	stream, w = connect(t, a, 1)
	if w.GetMode() != agentv1.OperatingMode_OPERATING_MODE_AUTO_PULL || w.GetDesiredRevision() != 2 {
		t.Errorf("welcome after mode change %v", w)
	}
	// The open push of revision 2 is still pending (the desired revision).
	msg, err = stream.Recv()
	if err != nil || msg.GetCommand().GetApplyRevision().GetRevision() != 2 {
		t.Errorf("open push after reconnect %v %v", msg, err)
	}
	eventually(t, "connected", func() bool { return e.hub.Connected(a.id) })
	if err := stream.CloseSend(); err != nil {
		t.Fatal(err)
	}
}