package virtual

import (
	"context"
	"errors"
	"regexp"
	"testing"

	"git.unkin.net/unkin/artifactapi/pkg/models"
)

func fakeEngine(members map[string]*RPMMember) *Engine {
	return &Engine{
		getRemote: func(_ context.Context, name string) (*models.Remote, error) {
			return &models.Remote{Name: name, RepoType: models.RepoTypeRemote}, nil
		},
		rpmMember: func(_ context.Context, name string) (*RPMMember, error) {
			if m := members[name]; m != nil {
				return m, nil
			}
			return nil, errors.New("upstream down")
		},
	}
}

func rpmVirt(members ...string) models.Virtual {
	return models.Virtual{Name: "v", PackageType: models.PackageRPM, Members: members}
}

func TestFetchRPMFailsClosed(t *testing.T) {
	e := fakeEngine(map[string]*RPMMember{
		"a": {RemoteName: "a", Data: map[string][]byte{"primary": primaryXML(primaryPkgXML("foo", "1", "aaa", "foo.rpm"))}},
	})
	_, _, err := e.Fetch(context.Background(), rpmVirt("a", "b"), "repodata/repomd.xml", "")
	if err == nil || errors.Is(err, ErrNotFound) {
		t.Fatalf("want upstream error with a member down, got %v", err)
	}
}

func TestFetchRPMDataSurvivesMemberChange(t *testing.T) {
	m := &RPMMember{RemoteName: "a", Data: map[string][]byte{"primary": primaryXML(primaryPkgXML("foo", "1", "aaa", "foo.rpm"))}}
	e := fakeEngine(map[string]*RPMMember{"a": m})
	virt := rpmVirt("a")

	repomd, _, err := e.Fetch(context.Background(), virt, "repodata/repomd.xml", "")
	if err != nil {
		t.Fatal(err)
	}
	m.Data = map[string][]byte{"primary": primaryXML(primaryPkgXML("foo", "2", "bbb", "foo2.rpm"))}

	href := regexp.MustCompile(`repodata/[0-9a-f]+-primary\.xml\.gz`).Find(repomd)
	body, _, err := e.Fetch(context.Background(), virt, string(href), "")
	if err != nil {
		t.Fatalf("data from previous repomd must stay resolvable: %v", err)
	}
	if got := string(gunzip(t, body)); !regexp.MustCompile(`ver="1"`).MatchString(got) {
		t.Fatalf("served wrong primary:\n%s", got)
	}

	newMD, _, err := e.Fetch(context.Background(), virt, "repodata/repomd.xml", "")
	if err != nil || string(newMD) == string(repomd) {
		t.Fatalf("repomd should reflect the member change (err %v)", err)
	}
}

func TestMemberRedirect(t *testing.T) {
	e := fakeEngine(nil)
	virt := rpmVirt("gh", "other")
	for _, tc := range []struct {
		path, query, want string
		ok                bool
		err               error
	}{
		{path: "gh/o/r/releases/download/v1/c++-1.rpm", query: "x=1", ok: true,
			want: "http://h/api/v1/remote/gh/o/r/releases/download/v1/c++-1.rpm?x=1"},
		{path: "gh/a%20b/c%3Fd.rpm", ok: true, want: "http://h/api/v1/remote/gh/a%20b/c%3Fd.rpm"},
		{path: "gh/../../remote/other/x", err: ErrBadPath},
		{path: "gh/%2e%2e/%2e%2e/remote/other/x", err: ErrBadPath},
		{path: "gh/a/./b", err: ErrBadPath},
		{path: "gh//etc/passwd", err: ErrBadPath},
		{path: "repodata/repomd.xml"},
		{path: "nope/x.rpm"},
	} {
		got, ok, err := e.MemberRedirect(context.Background(), virt, tc.path, tc.query, "http://h/")
		if got != tc.want || ok != tc.ok || !errors.Is(err, tc.err) {
			t.Errorf("%s: got (%q, %v, %v), want (%q, %v, %v)", tc.path, got, ok, err, tc.want, tc.ok, tc.err)
		}
	}
}