package cache

import (
	"errors"
	"net"
	"net/url"
	"testing"

	apierr "k8s.io/apimachinery/pkg/api/errors"
	"k8s.io/apimachinery/pkg/runtime/schema"

	"github.com/stretchr/testify/assert"

	"github.com/argoproj/gitops-engine/pkg/cache"
	"github.com/argoproj/gitops-engine/pkg/cache/mocks"
	"github.com/stretchr/testify/mock"

	appv1 "github.com/argoproj/argo-cd/v2/pkg/apis/application/v1alpha1"
)

type netError string

func (n netError) Error() string   { return string(n) }
func (n netError) Timeout() bool   { return false }
func (n netError) Temporary() bool { return false }

func TestHandleModEvent_HasChanges(t *testing.T) {
	clusterCache := &mocks.ClusterCache{}
	clusterCache.On("Invalidate", mock.Anything, mock.Anything).Return(nil).Once()
	clusterCache.On("EnsureSynced").Return(nil).Once()

	clustersCache := liveStateCache{
		clusters: map[string]cache.ClusterCache{
			"https://mycluster": clusterCache,
		},
	}

	clustersCache.handleModEvent(&appv1.Cluster{
		Server: "https://mycluster",
		Config: appv1.ClusterConfig{Username: "foo"},
	}, &appv1.Cluster{
		Server:     "https://mycluster",
		Config:     appv1.ClusterConfig{Username: "bar"},
		Namespaces: []string{"default"},
	})
}

func TestHandleModEvent_ClusterExcluded(t *testing.T) {
	clusterCache := &mocks.ClusterCache{}
	clusterCache.On("Invalidate", mock.Anything, mock.Anything).Return(nil).Once()
	clusterCache.On("EnsureSynced").Return(nil).Once()

	clustersCache := liveStateCache{
		clusters: map[string]cache.ClusterCache{
			"https://mycluster": clusterCache,
		},
		clusterFilter: func(cluster *appv1.Cluster) bool {
			return false
		},
	}

	clustersCache.handleModEvent(&appv1.Cluster{
		Server: "https://mycluster",
		Config: appv1.ClusterConfig{Username: "foo"},
	}, &appv1.Cluster{
		Server:     "https://mycluster",
		Config:     appv1.ClusterConfig{Username: "bar"},
		Namespaces: []string{"default"},
	})

	assert.Len(t, clustersCache.clusters, 0)
}

func TestHandleModEvent_NoChanges(t *testing.T) {
	clusterCache := &mocks.ClusterCache{}
	clusterCache.On("Invalidate", mock.Anything).Panic("should not invalidate")
	clusterCache.On("EnsureSynced").Return(nil).Panic("should not re-sync")

	clustersCache := liveStateCache{
		clusters: map[string]cache.ClusterCache{
			"https://mycluster": clusterCache,
		},
	}

	clustersCache.handleModEvent(&appv1.Cluster{
		Server: "https://mycluster",
		Config: appv1.ClusterConfig{Username: "bar"},
	}, &appv1.Cluster{
		Server: "https://mycluster",
		Config: appv1.ClusterConfig{Username: "bar"},
	})
}

func TestHandleAddEvent_ClusterExcluded(t *testing.T) {
	clustersCache := liveStateCache{
		clusters: map[string]cache.ClusterCache{},
		clusterFilter: func(cluster *appv1.Cluster) bool {
			return false
		},
	}
	clustersCache.handleAddEvent(&appv1.Cluster{
		Server: "https://mycluster",
		Config: appv1.ClusterConfig{Username: "bar"},
	})

	assert.Len(t, clustersCache.clusters, 0)
}

func TestIsRetryableError(t *testing.T) {
	var (
		tlsHandshakeTimeoutErr net.Error = netError("net/http: TLS handshake timeout")
		ioTimeoutErr           net.Error = netError("i/o timeout")
		connectionTimedout     net.Error = netError("connection timed out")
		connectionReset        net.Error = netError("connection reset by peer")
	)
	t.Run("Nil", func(t *testing.T) {
		assert.False(t, isRetryableError(nil))
	})
	t.Run("ResourceQuotaConflictErr", func(t *testing.T) {
		assert.False(t, isRetryableError(apierr.NewConflict(schema.GroupResource{}, "", nil)))
		assert.True(t, isRetryableError(apierr.NewConflict(schema.GroupResource{Group: "v1", Resource: "resourcequotas"}, "", nil)))
	})
	t.Run("ExceededQuotaErr", func(t *testing.T) {
		assert.False(t, isRetryableError(apierr.NewForbidden(schema.GroupResource{}, "", nil)))
		assert.True(t, isRetryableError(apierr.NewForbidden(schema.GroupResource{Group: "v1", Resource: "pods"}, "", errors.New("exceeded quota"))))
	})
	t.Run("TooManyRequestsDNS", func(t *testing.T) {
		assert.True(t, isRetryableError(apierr.NewTooManyRequests("", 0)))
	})
	t.Run("DNSError", func(t *testing.T) {
		assert.True(t, isRetryableError(&net.DNSError{}))
	})
	t.Run("OpError", func(t *testing.T) {
		assert.True(t, isRetryableError(&net.OpError{}))
	})
	t.Run("UnknownNetworkError", func(t *testing.T) {
		assert.True(t, isRetryableError(net.UnknownNetworkError("")))
	})
	t.Run("ConnectionClosedErr", func(t *testing.T) {
		assert.False(t, isRetryableError(&url.Error{Err: errors.New("")}))
		assert.True(t, isRetryableError(&url.Error{Err: errors.New("Connection closed by foreign host")}))
	})
	t.Run("TLSHandshakeTimeout", func(t *testing.T) {
		assert.True(t, isRetryableError(tlsHandshakeTimeoutErr))
	})
	t.Run("IOHandshakeTimeout", func(t *testing.T) {
		assert.True(t, isRetryableError(ioTimeoutErr))
	})
	t.Run("ConnectionTimeout", func(t *testing.T) {
		assert.True(t, isRetryableError(connectionTimedout))
	})
	t.Run("ConnectionReset", func(t *testing.T) {
		assert.True(t, isRetryableError(connectionReset))
	})
}