package client

import (
	"bytes"
	"context"
	"fmt"
	"io"
	"net/http"
	"strings"
	"testing"

	cerrdefs "github.com/containerd/errdefs"
	"github.com/docker/docker/testutil"
	"gotest.tools/v3/assert"
	is "gotest.tools/v3/assert/cmp"
)

func TestImageTagError(t *testing.T) {
	client := &Client{
		client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),
	}

	err := client.ImageTag(context.Background(), "image_id", "repo:tag")
	assert.Check(t, is.ErrorType(err, cerrdefs.IsInternal))
}

// Note: this is not testing all the InvalidReference as it's the responsibility
// of distribution/reference package.
func TestImageTagInvalidReference(t *testing.T) {
	client := &Client{
		client: newMockClient(errorMock(http.StatusInternalServerError, "Server error")),
	}

	err := client.ImageTag(context.Background(), "image_id", "aa/asdf$$^/aa")
	assert.Check(t, is.Error(err, `Error parsing reference: "aa/asdf$$^/aa" is not a valid repository/tag: invalid reference format`))
}

// Ensure we don't allow the use of invalid repository names or tags; these tag operations should fail.
func TestImageTagInvalidSourceImageName(t *testing.T) {
	ctx := context.Background()

	client := &Client{
		client: newMockClient(errorMock(http.StatusInternalServerError, "client should not have made an API call")),
	}

	invalidRepos := []string{"fo$z$", "Foo@3cc", "Foo$3", "Foo*3", "Fo^3", "Foo!3", "F)xcz(", "fo%asd", "aa/asdf$$^/aa"}
	for _, repo := range invalidRepos {
		t.Run("invalidRepo/"+repo, func(t *testing.T) {
			t.Parallel()
			err := client.ImageTag(ctx, "busybox", repo)
			assert.Check(t, is.ErrorContains(err, "not a valid repository/tag"))
		})
	}

	longTag := testutil.GenerateRandomAlphaOnlyString(121)
	invalidTags := []string{"repo:fo$z$", "repo:Foo@3cc", "repo:Foo$3", "repo:Foo*3", "repo:Fo^3", "repo:Foo!3", "repo:%goodbye", "repo:#hashtagit", "repo:F)xcz(", "repo:-foo", "repo:..", longTag}
	for _, repotag := range invalidTags {
		t.Run("invalidTag/"+repotag, func(t *testing.T) {
			t.Parallel()
			err := client.ImageTag(ctx, "busybox", repotag)
			assert.Check(t, is.ErrorContains(err, "not a valid repository/tag"))
		})
	}

	t.Run("test repository name begin with '-'", func(t *testing.T) {
		t.Parallel()
		err := client.ImageTag(ctx, "busybox:latest", "-busybox:test")
		assert.Check(t, is.ErrorContains(err, "Error parsing reference"))
	})

	t.Run("test namespace name begin with '-'", func(t *testing.T) {
		t.Parallel()
		err := client.ImageTag(ctx, "busybox:latest", "-test/busybox:test")
		assert.Check(t, is.ErrorContains(err, "Error parsing reference"))
	})

	t.Run("test index name begin with '-'", func(t *testing.T) {
		t.Parallel()
		err := client.ImageTag(ctx, "busybox:latest", "-index:5000/busybox:test")
		assert.Check(t, is.ErrorContains(err, "Error parsing reference"))
	})
}

func TestImageTagHexSource(t *testing.T) {
	client := &Client{
		client: newMockClient(errorMock(http.StatusOK, "OK")),
	}

	err := client.ImageTag(context.Background(), "0d409d33b27e47423b049f7f863faa08655a8c901749c2b25b93ca67d01a470d", "repo:tag")
	assert.NilError(t, err)
}

func TestImageTag(t *testing.T) {
	const expectedURL = "/images/image_id/tag"
	tagCases := []struct {
		reference           string
		expectedQueryParams map[string]string
	}{
		{
			reference: "repository:tag1",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/library/repository",
				"tag":  "tag1",
			},
		}, {
			reference: "another_repository:latest",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/library/another_repository",
				"tag":  "latest",
			},
		}, {
			reference: "another_repository",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/library/another_repository",
				"tag":  "latest",
			},
		}, {
			reference: "test/another_repository",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/test/another_repository",
				"tag":  "latest",
			},
		}, {
			reference: "test/another_repository:tag1",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/test/another_repository",
				"tag":  "tag1",
			},
		}, {
			reference: "test/test/another_repository:tag1",
			expectedQueryParams: map[string]string{
				"repo": "docker.io/test/test/another_repository",
				"tag":  "tag1",
			},
		}, {
			reference: "test:5000/test/another_repository:tag1",
			expectedQueryParams: map[string]string{
				"repo": "test:5000/test/another_repository",
				"tag":  "tag1",
			},
		}, {
			reference: "test:5000/test/another_repository",
			expectedQueryParams: map[string]string{
				"repo": "test:5000/test/another_repository",
				"tag":  "latest",
			},
		},
	}
	for _, tagCase := range tagCases {
		client := &Client{
			client: newMockClient(func(req *http.Request) (*http.Response, error) {
				if !strings.HasPrefix(req.URL.Path, expectedURL) {
					return nil, fmt.Errorf("expected URL '%s', got '%s'", expectedURL, req.URL)
				}
				if req.Method != http.MethodPost {
					return nil, fmt.Errorf("expected POST method, got %s", req.Method)
				}
				query := req.URL.Query()
				for key, expected := range tagCase.expectedQueryParams {
					actual := query.Get(key)
					if actual != expected {
						return nil, fmt.Errorf("%s not set in URL query properly. Expected '%s', got %s", key, expected, actual)
					}
				}
				return &http.Response{
					StatusCode: http.StatusOK,
					Body:       io.NopCloser(bytes.NewReader([]byte(""))),
				}, nil
			}),
		}
		err := client.ImageTag(context.Background(), "image_id", tagCase.reference)
		assert.NilError(t, err)
	}
}
