/*
   Copyright The containerd Authors.

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.
*/

package podsandbox

import (
	"context"
	"os"
	"strings"
	"testing"

	"github.com/containerd/containerd/oci"
	docker "github.com/distribution/reference"
	imagedigest "github.com/opencontainers/go-digest"
	runtimespec "github.com/opencontainers/runtime-spec/specs-go"
	"github.com/stretchr/testify/assert"
)

// TestGetUserFromImage tests the logic of getting image uid or user name of image user.
func TestGetUserFromImage(t *testing.T) {
	newI64 := func(i int64) *int64 { return &i }
	for c, test := range map[string]struct {
		user string
		uid  *int64
		name string
	}{
		"no gid": {
			user: "0",
			uid:  newI64(0),
		},
		"uid/gid": {
			user: "0:1",
			uid:  newI64(0),
		},
		"empty user": {
			user: "",
		},
		"multiple separators": {
			user: "1:2:3",
			uid:  newI64(1),
		},
		"root username": {
			user: "root:root",
			name: "root",
		},
		"username": {
			user: "test:test",
			name: "test",
		},
	} {
		t.Run(c, func(t *testing.T) {
			actualUID, actualName := getUserFromImage(test.user)
			assert.Equal(t, test.uid, actualUID)
			assert.Equal(t, test.name, actualName)
		})
	}
}

func TestGetRepoDigestAndTag(t *testing.T) {
	digest := imagedigest.Digest("sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59582")
	for desc, test := range map[string]struct {
		ref                string
		schema1            bool
		expectedRepoDigest string
		expectedRepoTag    string
	}{
		"repo tag should be empty if original ref has no tag": {
			ref:                "gcr.io/library/busybox@" + digest.String(),
			expectedRepoDigest: "gcr.io/library/busybox@" + digest.String(),
		},
		"repo tag should not be empty if original ref has tag": {
			ref:                "gcr.io/library/busybox:latest",
			expectedRepoDigest: "gcr.io/library/busybox@" + digest.String(),
			expectedRepoTag:    "gcr.io/library/busybox:latest",
		},
		"repo digest should be empty if original ref is schema1 and has no digest": {
			ref:                "gcr.io/library/busybox:latest",
			schema1:            true,
			expectedRepoDigest: "",
			expectedRepoTag:    "gcr.io/library/busybox:latest",
		},
		"repo digest should not be empty if original ref is schema1 but has digest": {
			ref:                "gcr.io/library/busybox@sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59594",
			schema1:            true,
			expectedRepoDigest: "gcr.io/library/busybox@sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59594",
			expectedRepoTag:    "",
		},
	} {
		t.Run(desc, func(t *testing.T) {
			named, err := docker.ParseDockerRef(test.ref)
			assert.NoError(t, err)
			repoDigest, repoTag := getRepoDigestAndTag(named, digest, test.schema1)
			assert.Equal(t, test.expectedRepoDigest, repoDigest)
			assert.Equal(t, test.expectedRepoTag, repoTag)
		})
	}
}

func TestBuildLabels(t *testing.T) {
	imageConfigLabels := map[string]string{
		"a":                            "z",
		"d":                            "y",
		"long-label":                   strings.Repeat("example", 10000),
		"containerd.io/restart.policy": "always",
		"io.cri-containerd.image":      "managed",
	}
	configLabels := map[string]string{
		"a": "b",
		"c": "d",
		// reserved namespaces are only filtered for image config labels, not
		// for labels from the CRI request
		"containerd.io/restart.status": "stopped",
	}
	newLabels := buildLabels(configLabels, imageConfigLabels, containerKindSandbox)
	assert.Len(t, newLabels, 5)
	assert.Equal(t, "b", newLabels["a"])
	assert.Equal(t, "d", newLabels["c"])
	assert.Equal(t, "y", newLabels["d"])
	assert.Equal(t, "stopped", newLabels["containerd.io/restart.status"])
	assert.Equal(t, containerKindSandbox, newLabels[containerKindLabel])
	assert.NotContains(t, newLabels, "long-label")
	assert.NotContains(t, newLabels, "containerd.io/restart.policy")
	assert.NotContains(t, newLabels, "io.cri-containerd.image")

	newLabels["a"] = "e"
	assert.Empty(t, configLabels[containerKindLabel], "should not add new labels into original label")
	assert.Equal(t, "b", configLabels["a"], "change in new labels should not affect original label")
}

func TestParseImageReferences(t *testing.T) {
	refs := []string{
		"gcr.io/library/busybox@sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59582",
		"gcr.io/library/busybox:1.2",
		"sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59582",
		"arbitrary-ref",
	}
	expectedTags := []string{
		"gcr.io/library/busybox:1.2",
	}
	expectedDigests := []string{"gcr.io/library/busybox@sha256:e6693c20186f837fc393390135d8a598a96a833917917789d63766cab6c59582"}
	tags, digests := parseImageReferences(refs)
	assert.Equal(t, expectedTags, tags)
	assert.Equal(t, expectedDigests, digests)
}

func TestEnvDeduplication(t *testing.T) {
	for desc, test := range map[string]struct {
		existing []string
		kv       [][2]string
		expected []string
	}{
		"single env": {
			kv: [][2]string{
				{"a", "b"},
			},
			expected: []string{"a=b"},
		},
		"multiple envs": {
			kv: [][2]string{
				{"a", "b"},
				{"c", "d"},
				{"e", "f"},
			},
			expected: []string{
				"a=b",
				"c=d",
				"e=f",
			},
		},
		"env override": {
			kv: [][2]string{
				{"k1", "v1"},
				{"k2", "v2"},
				{"k3", "v3"},
				{"k3", "v4"},
				{"k1", "v5"},
				{"k4", "v6"},
			},
			expected: []string{
				"k1=v5",
				"k2=v2",
				"k3=v4",
				"k4=v6",
			},
		},
		"existing env": {
			existing: []string{
				"k1=v1",
				"k2=v2",
				"k3=v3",
			},
			kv: [][2]string{
				{"k3", "v4"},
				{"k2", "v5"},
				{"k4", "v6"},
			},
			expected: []string{
				"k1=v1",
				"k2=v5",
				"k3=v4",
				"k4=v6",
			},
		},
	} {
		t.Run(desc, func(t *testing.T) {
			var spec runtimespec.Spec
			if len(test.existing) > 0 {
				spec.Process = &runtimespec.Process{
					Env: test.existing,
				}
			}
			for _, kv := range test.kv {
				oci.WithEnv([]string{kv[0] + "=" + kv[1]})(context.Background(), nil, nil, &spec)
			}
			assert.Equal(t, test.expected, spec.Process.Env)
		})
	}
}

func TestPassThroughAnnotationsFilter(t *testing.T) {
	for desc, test := range map[string]struct {
		podAnnotations         map[string]string
		runtimePodAnnotations  []string
		passthroughAnnotations map[string]string
	}{
		"should support direct match": {
			podAnnotations:         map[string]string{"c": "d", "d": "e"},
			runtimePodAnnotations:  []string{"c"},
			passthroughAnnotations: map[string]string{"c": "d"},
		},
		"should support wildcard match": {
			podAnnotations: map[string]string{
				"t.f":  "j",
				"z.g":  "o",
				"z":    "o",
				"y.ca": "b",
				"y":    "b",
			},
			runtimePodAnnotations: []string{"*.f", "z*g", "y.c*"},
			passthroughAnnotations: map[string]string{
				"t.f":  "j",
				"z.g":  "o",
				"y.ca": "b",
			},
		},
		"should support wildcard match all": {
			podAnnotations: map[string]string{
				"t.f":  "j",
				"z.g":  "o",
				"z":    "o",
				"y.ca": "b",
				"y":    "b",
			},
			runtimePodAnnotations: []string{"*"},
			passthroughAnnotations: map[string]string{
				"t.f":  "j",
				"z.g":  "o",
				"z":    "o",
				"y.ca": "b",
				"y":    "b",
			},
		},
		"should support match including path separator": {
			podAnnotations: map[string]string{
				"matchend.com/end":    "1",
				"matchend.com/end1":   "2",
				"matchend.com/1end":   "3",
				"matchmid.com/mid":    "4",
				"matchmid.com/mi1d":   "5",
				"matchmid.com/mid1":   "6",
				"matchhead.com/head":  "7",
				"matchhead.com/1head": "8",
				"matchhead.com/head1": "9",
				"matchall.com/abc":    "10",
				"matchall.com/def":    "11",
				"end/matchend":        "12",
				"end1/matchend":       "13",
				"1end/matchend":       "14",
				"mid/matchmid":        "15",
				"mi1d/matchmid":       "16",
				"mid1/matchmid":       "17",
				"head/matchhead":      "18",
				"1head/matchhead":     "19",
				"head1/matchhead":     "20",
				"abc/matchall":        "21",
				"def/matchall":        "22",
				"match1/match2":       "23",
				"nomatch/nomatch":     "24",
			},
			runtimePodAnnotations: []string{
				"matchend.com/end*",
				"matchmid.com/mi*d",
				"matchhead.com/*head",
				"matchall.com/*",
				"end*/matchend",
				"mi*d/matchmid",
				"*head/matchhead",
				"*/matchall",
				"match*/match*",
			},
			passthroughAnnotations: map[string]string{
				"matchend.com/end":    "1",
				"matchend.com/end1":   "2",
				"matchmid.com/mid":    "4",
				"matchmid.com/mi1d":   "5",
				"matchhead.com/head":  "7",
				"matchhead.com/1head": "8",
				"matchall.com/abc":    "10",
				"matchall.com/def":    "11",
				"end/matchend":        "12",
				"end1/matchend":       "13",
				"mid/matchmid":        "15",
				"mi1d/matchmid":       "16",
				"head/matchhead":      "18",
				"1head/matchhead":     "19",
				"abc/matchall":        "21",
				"def/matchall":        "22",
				"match1/match2":       "23",
			},
		},
	} {
		t.Run(desc, func(t *testing.T) {
			passthroughAnnotations := getPassthroughAnnotations(test.podAnnotations, test.runtimePodAnnotations)
			assert.Equal(t, test.passthroughAnnotations, passthroughAnnotations)
		})
	}
}

func TestEnsureRemoveAllNotExist(t *testing.T) {
	// should never return an error for a non-existent path
	if err := ensureRemoveAll(context.Background(), "/non/existent/path"); err != nil {
		t.Fatal(err)
	}
}

func TestEnsureRemoveAllWithDir(t *testing.T) {
	dir := t.TempDir()
	if err := ensureRemoveAll(context.Background(), dir); err != nil {
		t.Fatal(err)
	}
}

func TestEnsureRemoveAllWithFile(t *testing.T) {
	tmp, err := os.CreateTemp("", "test-ensure-removeall-with-dir")
	if err != nil {
		t.Fatal(err)
	}
	tmp.Close()
	if err := ensureRemoveAll(context.Background(), tmp.Name()); err != nil {
		t.Fatal(err)
	}
}
