// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

//go:build integration_api

package api

import (
	"context"
	"strings"
	"testing"
	"time"

	"github.com/siderolabs/talos/internal/integration/base"
	"github.com/siderolabs/talos/pkg/machinery/config/machine"
	"github.com/siderolabs/talos/pkg/machinery/config/types/v1alpha1"
)

// CommonSuite verifies some default settings such as ulimits.
type CommonSuite struct {
	base.K8sSuite

	ctx       context.Context //nolint:containedctx
	ctxCancel context.CancelFunc
}

// SuiteName ...
func (suite *CommonSuite) SuiteName() string {
	return "api.CommonSuite"
}

// SetupTest ...
func (suite *CommonSuite) SetupTest() {
	// make sure API calls have timeout
	suite.ctx, suite.ctxCancel = context.WithTimeout(context.Background(), 15*time.Minute)
}

// TearDownTest ...
func (suite *CommonSuite) TearDownTest() {
	if suite.ctxCancel != nil {
		suite.ctxCancel()
	}
}

// TestVirtioModulesLoaded verifies that the virtio modules are loaded.
func (suite *CommonSuite) TestVirtioModulesLoaded() {
	if suite.Cluster == nil || suite.Cluster.Provisioner() != base.ProvisionerQEMU {
		suite.T().Skip("skipping virtio test since provisioner is not qemu")
	}

	expectedVirtIOModules := map[string]string{
		"virtio_balloon":        "virtio_balloon.ko",
		"virtio_pci":            "virtio_pci.ko",
		"virtio_pci_legacy_dev": "virtio_pci_legacy_dev.ko",
		"virtio_pci_modern_dev": "virtio_pci_modern_dev.ko",
	}

	node := suite.RandomDiscoveredNodeInternalIP()
	suite.AssertExpectedModules(suite.ctx, node, expectedVirtIOModules)
}

// TestCommonDefaults verifies that the default ulimits are set.
func (suite *CommonSuite) TestCommonDefaults() {
	if suite.Cluster != nil && suite.Cluster.Provisioner() == base.ProvisionerDocker {
		suite.T().Skip("skipping ulimits test since provisioner is docker")
	}

	expectedUlimit := `
core file size (blocks)         (-c) 0
data seg size (kb)              (-d) unlimited
scheduling priority             (-e) 0
file size (blocks)              (-f) unlimited
max locked memory (kb)          (-l) 8192
max memory size (kb)            (-m) unlimited
open files                      (-n) 1048576
POSIX message queues (bytes)    (-q) 819200
real-time priority              (-r) 0
stack size (kb)                 (-s) 8192
cpu time (seconds)              (-t) unlimited
virtual memory (kb)             (-v) unlimited
file locks                      (-x) unlimited
`

	defaultsTestPodDef, err := suite.NewPod("defaults-ulimits-test")
	suite.Require().NoError(err)

	suite.Require().NoError(defaultsTestPodDef.Create(suite.ctx, 5*time.Minute))

	defer defaultsTestPodDef.Delete(suite.ctx) //nolint:errcheck

	stdout, stderr, err := defaultsTestPodDef.Exec(
		suite.ctx,
		"ulimit -c -d -e -f -l -m -n -q -r -s -t -v -x",
	)
	suite.Require().NoError(err)

	suite.Require().Equal("", stderr)
	suite.Require().Equal(strings.TrimPrefix(expectedUlimit, "\n"), stdout)
}

// TestDNSResolver verifies that external DNS resolving works from a pod.
func (suite *CommonSuite) TestDNSResolver() {
	if suite.Cluster != nil {
		// cluster should be healthy for kube-dns resolving to work
		suite.AssertClusterHealthy(suite.ctx)
	}

	dnsTestPodDef, err := suite.NewPod("dns-test")
	suite.Require().NoError(err)

	suite.Require().NoError(dnsTestPodDef.Create(suite.ctx, 5*time.Minute))

	defer dnsTestPodDef.Delete(suite.ctx) //nolint:errcheck

	stdout, stderr, err := dnsTestPodDef.Exec(
		suite.ctx,
		"wget -S https://www.google.com/",
	)
	suite.Assert().NoError(err)

	suite.Assert().Equal("", stdout)
	suite.Assert().Contains(stderr, "'index.html' saved")

	if suite.T().Failed() {
		suite.LogPodLogsByLabel(suite.ctx, "kube-system", "k8s-app", "kube-dns")

		for _, node := range suite.DiscoverNodeInternalIPs(suite.ctx) {
			suite.DumpLogs(suite.ctx, node, "dns-resolve-cache", "google")
		}

		suite.T().FailNow()
	}

	_, stderr, err = dnsTestPodDef.Exec(
		suite.ctx,
		"apk add --update bind-tools",
	)

	suite.Assert().NoError(err)
	suite.Assert().Empty(stderr, "stderr: %s", stderr)

	if suite.T().Failed() {
		suite.T().FailNow()
	}

	stdout, stderr, err = dnsTestPodDef.Exec(
		suite.ctx,
		"dig really-long-record.dev.siderolabs.io",
	)

	suite.Assert().NoError(err)
	suite.Assert().Contains(stdout, "status: NOERROR")
	suite.Assert().Contains(stdout, "ANSWER: 34")
	suite.Assert().NotContains(stdout, "status: NXDOMAIN")
	suite.Assert().Equal(stderr, "")

	if suite.T().Failed() {
		suite.T().FailNow()
	}
}

// TestBaseOCISpec verifies that the base OCI spec can be modified.
func (suite *CommonSuite) TestBaseOCISpec() {
	if suite.Cluster != nil && suite.Cluster.Provisioner() == base.ProvisionerDocker {
		suite.T().Skip("skipping ulimits test since provisioner is docker")
	}

	if testing.Short() {
		suite.T().Skip("skipping test in short mode.")
	}

	node := suite.RandomDiscoveredNodeInternalIP(machine.TypeWorker)

	k8sNode, err := suite.GetK8sNodeByInternalIP(suite.ctx, node)
	suite.Require().NoError(err)

	nodeName := k8sNode.Name

	suite.T().Logf("adjusting base OCI specs on %s/%s", node, nodeName)

	suite.AssertRebooted(
		suite.ctx, node, func(nodeCtx context.Context) error {
			suite.PatchMachineConfig(nodeCtx, &v1alpha1.Config{
				MachineConfig: &v1alpha1.MachineConfig{
					MachineBaseRuntimeSpecOverrides: v1alpha1.Unstructured{
						Object: map[string]any{
							"process": map[string]any{
								"rlimits": []map[string]any{
									{
										"type": "RLIMIT_NOFILE",
										"hard": 1024,
										"soft": 1024,
									},
								},
							},
						},
					},
				},
			})

			return nil
		}, assertRebootedRebootTimeout,
		suite.CleanupFailedPods,
	)

	suite.ClearConnectionRefused(suite.ctx, node)

	ociUlimits1PodDef, err := suite.NewPod("oci-ulimits-test-1")
	suite.Require().NoError(err)

	ociUlimits1PodDef = ociUlimits1PodDef.WithNodeName(nodeName)

	suite.Require().NoError(ociUlimits1PodDef.Create(suite.ctx, 5*time.Minute))

	defer func() { suite.Assert().NoError(ociUlimits1PodDef.Delete(suite.ctx)) }()

	stdout, stderr, err := ociUlimits1PodDef.Exec(
		suite.ctx,
		"ulimit -n",
	)
	suite.Require().NoError(err)

	suite.Require().Equal("", stderr)
	suite.Require().Equal("1024\n", stdout)

	// delete immediately, as we're going to reboot the node
	suite.Assert().NoError(ociUlimits1PodDef.Delete(suite.ctx))

	// revert the patch
	suite.AssertRebooted(
		suite.ctx, node, func(nodeCtx context.Context) error {
			suite.PatchMachineConfig(nodeCtx, map[string]any{
				"machine": map[string]any{
					"baseRuntimeSpecOverrides": map[string]any{
						"$patch": "delete",
					},
				},
			})

			return nil
		}, assertRebootedRebootTimeout,
		suite.CleanupFailedPods,
	)

	suite.ClearConnectionRefused(suite.ctx, node)

	ociUlimits2PodDef, err := suite.NewPod("oci-ulimits-test-2")
	suite.Require().NoError(err)

	ociUlimits2PodDef = ociUlimits2PodDef.WithNodeName(nodeName)

	suite.Require().NoError(ociUlimits2PodDef.Create(suite.ctx, 5*time.Minute))

	defer func() { suite.Assert().NoError(ociUlimits2PodDef.Delete(suite.ctx)) }()

	stdout, stderr, err = ociUlimits2PodDef.Exec(
		suite.ctx,
		"ulimit -n",
	)
	suite.Require().NoError(err)

	suite.Require().Equal("", stderr)
	suite.Require().Equal("1048576\n", stdout)
}

func init() {
	allSuites = append(allSuites, &CommonSuite{})
}