package client

import (
	"context"
	"errors"
	"fmt"
	"io"
	"net/http"
	"testing"

	cerrdefs "github.com/containerd/errdefs"
	"github.com/moby/moby/api/types/registry"
	"gotest.tools/v3/assert"
	is "gotest.tools/v3/assert/cmp"
)

func TestImagePushReferenceError(t *testing.T) {
	client, err := New(WithMockClient(func(req *http.Request) (*http.Response, error) {
		return nil, nil
	}))
	assert.NilError(t, err)
	// An empty reference is an invalid reference
	_, err = client.ImagePush(t.Context(), "", ImagePushOptions{})
	assert.Check(t, is.ErrorContains(err, "invalid reference format"))
	// A canonical reference cannot be pushed
	_, err = client.ImagePush(t.Context(), "repo@sha256:ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff", ImagePushOptions{})
	assert.Check(t, is.Error(err, "cannot push a digest reference"))
}

func TestImagePushAnyError(t *testing.T) {
	client, err := New(WithMockClient(errorMock(http.StatusInternalServerError, "Server error")))
	assert.NilError(t, err)
	_, err = client.ImagePush(t.Context(), "myimage", ImagePushOptions{})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsInternal))
}

func TestImagePushStatusUnauthorizedError(t *testing.T) {
	client, err := New(WithMockClient(errorMock(http.StatusUnauthorized, "Unauthorized error")))
	assert.NilError(t, err)
	_, err = client.ImagePush(t.Context(), "myimage", ImagePushOptions{})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsUnauthorized))
}

func TestImagePushWithUnauthorizedErrorAndPrivilegeFuncError(t *testing.T) {
	client, err := New(WithMockClient(errorMock(http.StatusUnauthorized, "Unauthorized error")))
	assert.NilError(t, err)
	privilegeFunc := func(_ context.Context) (string, error) {
		return "", errors.New("error requesting privilege")
	}
	_, err = client.ImagePush(t.Context(), "myimage", ImagePushOptions{
		PrivilegeFunc: privilegeFunc,
	})
	assert.Check(t, is.Error(err, "error requesting privilege"))
}

func TestImagePushWithUnauthorizedErrorAndAnotherUnauthorizedError(t *testing.T) {
	client, err := New(WithMockClient(errorMock(http.StatusUnauthorized, "Unauthorized error")))
	assert.NilError(t, err)
	privilegeFunc := func(_ context.Context) (string, error) {
		return "a-auth-header", nil
	}
	_, err = client.ImagePush(t.Context(), "myimage", ImagePushOptions{
		PrivilegeFunc: privilegeFunc,
	})
	assert.Check(t, is.ErrorType(err, cerrdefs.IsUnauthorized))
}

func TestImagePushWithPrivilegedFuncNoError(t *testing.T) {
	const expectedURL = "/images/docker.io/myname/myimage/push"
	const invalidAuth = "NotValid"
	const validAuth = "IAmValid"
	client, err := New(WithMockClient(func(req *http.Request) (*http.Response, error) {
		if err := assertRequest(req, http.MethodPost, expectedURL); err != nil {
			return nil, err
		}
		auth := req.Header.Get(registry.AuthHeader)
		if auth == invalidAuth {
			return mockResponse(http.StatusUnauthorized, nil, "Invalid credentials")(req)
		}
		if auth != validAuth {
			return nil, fmt.Errorf("invalid auth header: expected %s, got %s", "IAmValid", auth)
		}
		query := req.URL.Query()
		tag := query.Get("tag")
		if tag != "tag" {
			return nil, fmt.Errorf("tag not set in URL query properly. Expected '%s', got %s", "tag", tag)
		}
		return mockResponse(http.StatusOK, nil, "hello world")(req)
	}))
	assert.NilError(t, err)
	resp, err := client.ImagePush(t.Context(), "myname/myimage:tag", ImagePushOptions{
		RegistryAuth:  invalidAuth,
		PrivilegeFunc: staticAuth(validAuth),
	})
	assert.NilError(t, err)
	body, err := io.ReadAll(resp)
	assert.NilError(t, err)
	assert.Check(t, is.Equal(string(body), "hello world"))
}

func TestImagePushWithoutErrors(t *testing.T) {
	const (
		expectedURLFormat = "/images/%s/push"
		expectedOutput    = "hello world"
	)
	testCases := []struct {
		all           bool
		reference     string
		expectedImage string
		expectedTag   string
	}{
		{
			all:           false,
			reference:     "myimage",
			expectedImage: "docker.io/library/myimage",
			expectedTag:   "latest",
		},
		{
			all:           false,
			reference:     "myimage:tag",
			expectedImage: "docker.io/library/myimage",
			expectedTag:   "tag",
		},
		{
			all:           true,
			reference:     "myimage",
			expectedImage: "docker.io/library/myimage",
			expectedTag:   "",
		},
		{
			all:           true,
			reference:     "myimage:anything",
			expectedImage: "docker.io/library/myimage",
			expectedTag:   "",
		},
		{
			reference:     "myname/myimage",
			expectedImage: "docker.io/myname/myimage",
			expectedTag:   "latest",
		},
		{
			reference:     "docker.io/myname/myimage",
			expectedImage: "docker.io/myname/myimage",
			expectedTag:   "latest",
		},
		{
			reference:     "index.docker.io/myname/myimage:tag",
			expectedImage: "docker.io/myname/myimage",
			expectedTag:   "tag",
		},
		{
			reference:     "localhost/myname/myimage",
			expectedImage: "localhost/myname/myimage",
			expectedTag:   "latest",
		},
		{
			reference:     "registry.example.com:5000/myimage:tag",
			expectedImage: "registry.example.com:5000/myimage",
			expectedTag:   "tag",
		},
	}
	for _, tc := range testCases {
		t.Run(fmt.Sprintf("%s,all-tags=%t", tc.reference, tc.all), func(t *testing.T) {
			client, err := New(WithMockClient(func(req *http.Request) (*http.Response, error) {
				expectedURL := fmt.Sprintf(expectedURLFormat, tc.expectedImage)
				if err := assertRequest(req, http.MethodPost, expectedURL); err != nil {
					return nil, err
				}
				query := req.URL.Query()
				tag := query.Get("tag")
				if tag != tc.expectedTag {
					return nil, fmt.Errorf("tag not set in URL query properly. Expected '%s', got %s", tc.expectedTag, tag)
				}
				return mockResponse(http.StatusOK, nil, expectedOutput)(req)
			}))
			assert.NilError(t, err)
			resp, err := client.ImagePush(t.Context(), tc.reference, ImagePushOptions{
				All: tc.all,
			})
			assert.NilError(t, err)
			body, err := io.ReadAll(resp)
			assert.NilError(t, err)
			assert.Check(t, is.Equal(string(body), expectedOutput))
		})
	}
}