/*
   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 docker

import (
	"regexp"
	"strings"
	"testing"
)

type regexpMatch struct {
	input string
	match bool
	subs  []string
}

func checkRegexp(t *testing.T, r *regexp.Regexp, m regexpMatch) {
	matches := r.FindStringSubmatch(m.input)
	if m.match && matches != nil {
		if len(matches) != (r.NumSubexp()+1) || matches[0] != m.input {
			t.Fatalf("Bad match result %#v for %q", matches, m.input)
		}
		if len(matches) < (len(m.subs) + 1) {
			t.Errorf("Expected %d sub matches, only have %d for %q", len(m.subs), len(matches)-1, m.input)
		}
		for i := range m.subs {
			if m.subs[i] != matches[i+1] {
				t.Errorf("Unexpected submatch %d: %q, expected %q for %q", i+1, matches[i+1], m.subs[i], m.input)
			}
		}
	} else if m.match {
		t.Errorf("Expected match for %q", m.input)
	} else if matches != nil {
		t.Errorf("Unexpected match for %q", m.input)
	}
}

func TestDomainRegexp(t *testing.T) {
	hostcases := []regexpMatch{
		{
			input: "test.com",
			match: true,
		},
		{
			input: "test.com:10304",
			match: true,
		},
		{
			input: "test.com:http",
			match: false,
		},
		{
			input: "localhost",
			match: true,
		},
		{
			input: "localhost:8080",
			match: true,
		},
		{
			input: "a",
			match: true,
		},
		{
			input: "a.b",
			match: true,
		},
		{
			input: "ab.cd.com",
			match: true,
		},
		{
			input: "a-b.com",
			match: true,
		},
		{
			input: "-ab.com",
			match: false,
		},
		{
			input: "ab-.com",
			match: false,
		},
		{
			input: "ab.c-om",
			match: true,
		},
		{
			input: "ab.-com",
			match: false,
		},
		{
			input: "ab.com-",
			match: false,
		},
		{
			input: "0101.com",
			match: true, // TODO(dmcgowan): valid if this should be allowed
		},
		{
			input: "001a.com",
			match: true,
		},
		{
			input: "b.gbc.io:443",
			match: true,
		},
		{
			input: "b.gbc.io",
			match: true,
		},
		{
			input: "xn--n3h.com", // ☃.com in punycode
			match: true,
		},
		{
			input: "Asdf.com", // uppercase character
			match: true,
		},
	}
	r := regexp.MustCompile(`^` + DomainRegexp.String() + `$`)
	for i := range hostcases {
		checkRegexp(t, r, hostcases[i])
	}
}

func TestFullNameRegexp(t *testing.T) {
	if anchoredNameRegexp.NumSubexp() != 2 {
		t.Fatalf("anchored name regexp should have two submatches: %v, %v != 2",
			anchoredNameRegexp, anchoredNameRegexp.NumSubexp())
	}

	testcases := []regexpMatch{
		{
			input: "",
			match: false,
		},
		{
			input: "short",
			match: true,
			subs:  []string{"", "short"},
		},
		{
			input: "simple/name",
			match: true,
			subs:  []string{"simple", "name"},
		},
		{
			input: "library/ubuntu",
			match: true,
			subs:  []string{"library", "ubuntu"},
		},
		{
			input: "docker/stevvooe/app",
			match: true,
			subs:  []string{"docker", "stevvooe/app"},
		},
		{
			input: "aa/aa/aa/aa/aa/aa/aa/aa/aa/bb/bb/bb/bb/bb/bb",
			match: true,
			subs:  []string{"aa", "aa/aa/aa/aa/aa/aa/aa/aa/bb/bb/bb/bb/bb/bb"},
		},
		{
			input: "aa/aa/bb/bb/bb",
			match: true,
			subs:  []string{"aa", "aa/bb/bb/bb"},
		},
		{
			input: "a/a/a/a",
			match: true,
			subs:  []string{"a", "a/a/a"},
		},
		{
			input: "a/a/a/a/",
			match: false,
		},
		{
			input: "a//a/a",
			match: false,
		},
		{
			input: "a",
			match: true,
			subs:  []string{"", "a"},
		},
		{
			input: "a/aa",
			match: true,
			subs:  []string{"a", "aa"},
		},
		{
			input: "a/aa/a",
			match: true,
			subs:  []string{"a", "aa/a"},
		},
		{
			input: "foo.com",
			match: true,
			subs:  []string{"", "foo.com"},
		},
		{
			input: "foo.com/",
			match: false,
		},
		{
			input: "foo.com:8080/bar",
			match: true,
			subs:  []string{"foo.com:8080", "bar"},
		},
		{
			input: "foo.com:http/bar",
			match: false,
		},
		{
			input: "foo.com/bar",
			match: true,
			subs:  []string{"foo.com", "bar"},
		},
		{
			input: "foo.com/bar/baz",
			match: true,
			subs:  []string{"foo.com", "bar/baz"},
		},
		{
			input: "localhost:8080/bar",
			match: true,
			subs:  []string{"localhost:8080", "bar"},
		},
		{
			input: "sub-dom1.foo.com/bar/baz/quux",
			match: true,
			subs:  []string{"sub-dom1.foo.com", "bar/baz/quux"},
		},
		{
			input: "blog.foo.com/bar/baz",
			match: true,
			subs:  []string{"blog.foo.com", "bar/baz"},
		},
		{
			input: "a^a",
			match: false,
		},
		{
			input: "aa/asdf$$^/aa",
			match: false,
		},
		{
			input: "asdf$$^/aa",
			match: false,
		},
		{
			input: "aa-a/a",
			match: true,
			subs:  []string{"aa-a", "a"},
		},
		{
			input: strings.Repeat("a/", 128) + "a",
			match: true,
			subs:  []string{"a", strings.Repeat("a/", 127) + "a"},
		},
		{
			input: "a-/a/a/a",
			match: false,
		},
		{
			input: "foo.com/a-/a/a",
			match: false,
		},
		{
			input: "-foo/bar",
			match: false,
		},
		{
			input: "foo/bar-",
			match: false,
		},
		{
			input: "foo-/bar",
			match: false,
		},
		{
			input: "foo/-bar",
			match: false,
		},
		{
			input: "_foo/bar",
			match: false,
		},
		{
			input: "foo_bar",
			match: true,
			subs:  []string{"", "foo_bar"},
		},
		{
			input: "foo_bar.com",
			match: true,
			subs:  []string{"", "foo_bar.com"},
		},
		{
			input: "foo_bar.com:8080",
			match: false,
		},
		{
			input: "foo_bar.com:8080/app",
			match: false,
		},
		{
			input: "foo.com/foo_bar",
			match: true,
			subs:  []string{"foo.com", "foo_bar"},
		},
		{
			input: "____/____",
			match: false,
		},
		{
			input: "_docker/_docker",
			match: false,
		},
		{
			input: "docker_/docker_",
			match: false,
		},
		{
			input: "b.gcr.io/test.example.com/my-app",
			match: true,
			subs:  []string{"b.gcr.io", "test.example.com/my-app"},
		},
		{
			input: "xn--n3h.com/myimage", // ☃.com in punycode
			match: true,
			subs:  []string{"xn--n3h.com", "myimage"},
		},
		{
			input: "xn--7o8h.com/myimage", // 🐳.com in punycode
			match: true,
			subs:  []string{"xn--7o8h.com", "myimage"},
		},
		{
			input: "example.com/xn--7o8h.com/myimage", // 🐳.com in punycode
			match: true,
			subs:  []string{"example.com", "xn--7o8h.com/myimage"},
		},
		{
			input: "example.com/some_separator__underscore/myimage",
			match: true,
			subs:  []string{"example.com", "some_separator__underscore/myimage"},
		},
		{
			input: "example.com/__underscore/myimage",
			match: false,
		},
		{
			input: "example.com/..dots/myimage",
			match: false,
		},
		{
			input: "example.com/.dots/myimage",
			match: false,
		},
		{
			input: "example.com/nodouble..dots/myimage",
			match: false,
		},
		{
			input: "example.com/nodouble..dots/myimage",
			match: false,
		},
		{
			input: "docker./docker",
			match: false,
		},
		{
			input: ".docker/docker",
			match: false,
		},
		{
			input: "docker-/docker",
			match: false,
		},
		{
			input: "-docker/docker",
			match: false,
		},
		{
			input: "do..cker/docker",
			match: false,
		},
		{
			input: "do__cker:8080/docker",
			match: false,
		},
		{
			input: "do__cker/docker",
			match: true,
			subs:  []string{"", "do__cker/docker"},
		},
		{
			input: "b.gcr.io/test.example.com/my-app",
			match: true,
			subs:  []string{"b.gcr.io", "test.example.com/my-app"},
		},
		{
			input: "registry.io/foo/project--id.module--name.ver---sion--name",
			match: true,
			subs:  []string{"registry.io", "foo/project--id.module--name.ver---sion--name"},
		},
		{
			input: "Asdf.com/foo/bar", // uppercase character in hostname
			match: true,
		},
		{
			input: "Foo/FarB", // uppercase characters in remote name
			match: false,
		},
	}
	for i := range testcases {
		checkRegexp(t, anchoredNameRegexp, testcases[i])
	}
}

func TestReferenceRegexp(t *testing.T) {
	if ReferenceRegexp.NumSubexp() != 3 {
		t.Fatalf("anchored name regexp should have three submatches: %v, %v != 3",
			ReferenceRegexp, ReferenceRegexp.NumSubexp())
	}

	testcases := []regexpMatch{
		{
			input: "registry.com:8080/myapp:tag",
			match: true,
			subs:  []string{"registry.com:8080/myapp", "tag", ""},
		},
		{
			input: "registry.com:8080/myapp@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: true,
			subs:  []string{"registry.com:8080/myapp", "", "sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912"},
		},
		{
			input: "registry.com:8080/myapp:tag2@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: true,
			subs:  []string{"registry.com:8080/myapp", "tag2", "sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912"},
		},
		{
			input: "registry.com:8080/myapp@sha256:badbadbadbad",
			match: false,
		},
		{
			input: "registry.com:8080/myapp:invalid~tag",
			match: false,
		},
		{
			input: "bad_hostname.com:8080/myapp:tag",
			match: false,
		},
		{
			input:// localhost treated as name, missing tag with 8080 as tag
			"localhost:8080@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: true,
			subs:  []string{"localhost", "8080", "sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912"},
		},
		{
			input: "localhost:8080/name@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: true,
			subs:  []string{"localhost:8080/name", "", "sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912"},
		},
		{
			input: "localhost:http/name@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: false,
		},
		{
			// localhost will be treated as an image name without a host
			input: "localhost@sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912",
			match: true,
			subs:  []string{"localhost", "", "sha256:be178c0543eb17f5f3043021c9e5fcf30285e557a4fc309cce97ff9ca6182912"},
		},
		{
			input: "registry.com:8080/myapp@bad",
			match: false,
		},
		{
			input: "registry.com:8080/myapp@2bad",
			match: false, // TODO(dmcgowan): Support this as valid
		},
	}

	for i := range testcases {
		checkRegexp(t, ReferenceRegexp, testcases[i])
	}

}

func TestIdentifierRegexp(t *testing.T) {
	fullCases := []regexpMatch{
		{
			input: "da304e823d8ca2b9d863a3c897baeb852ba21ea9a9f1414736394ae7fcaf9821",
			match: true,
		},
		{
			input: "7EC43B381E5AEFE6E04EFB0B3F0693FF2A4A50652D64AEC573905F2DB5889A1C",
			match: false,
		},
		{
			input: "da304e823d8ca2b9d863a3c897baeb852ba21ea9a9f1414736394ae7fcaf",
			match: false,
		},
		{
			input: "sha256:da304e823d8ca2b9d863a3c897baeb852ba21ea9a9f1414736394ae7fcaf9821",
			match: false,
		},
		{
			input: "da304e823d8ca2b9d863a3c897baeb852ba21ea9a9f1414736394ae7fcaf98218482",
			match: false,
		},
	}

	for i := range fullCases {
		checkRegexp(t, anchoredIdentifierRegexp, fullCases[i])
	}
}