package git

import (
	"bytes"
	"io"
	"io/ioutil"
	"os"

	"gopkg.in/src-d/go-git.v4/config"
	"gopkg.in/src-d/go-git.v4/plumbing"
	"gopkg.in/src-d/go-git.v4/plumbing/storer"
	"gopkg.in/src-d/go-git.v4/storage/filesystem"
	"gopkg.in/src-d/go-git.v4/storage/memory"
	osfs "gopkg.in/src-d/go-git.v4/utils/fs/os"

	. "gopkg.in/check.v1"
)

type RemoteSuite struct {
	BaseSuite
}

var _ = Suite(&RemoteSuite{})

func (s *RemoteSuite) TestFetchInvalidEndpoint(c *C) {
	r := newRemote(nil, nil, &config.RemoteConfig{Name: "foo", URL: "qux"})
	err := r.Fetch(&FetchOptions{})
	c.Assert(err, ErrorMatches, ".*invalid endpoint.*")
}

func (s *RemoteSuite) TestFetchNonExistentEndpoint(c *C) {
	r := newRemote(nil, nil, &config.RemoteConfig{Name: "foo", URL: "ssh://non-existent/foo.git"})
	err := r.Fetch(&FetchOptions{})
	c.Assert(err, NotNil)
}

func (s *RemoteSuite) TestFetchInvalidSchemaEndpoint(c *C) {
	r := newRemote(nil, nil, &config.RemoteConfig{Name: "foo", URL: "qux://foo"})
	err := r.Fetch(&FetchOptions{})
	c.Assert(err, ErrorMatches, ".*unsupported scheme.*")
}

func (s *RemoteSuite) TestFetchInvalidFetchOptions(c *C) {
	r := newRemote(nil, nil, &config.RemoteConfig{Name: "foo", URL: "qux://foo"})
	invalid := config.RefSpec("^*$ñ")
	err := r.Fetch(&FetchOptions{RefSpecs: []config.RefSpec{invalid}})
	c.Assert(err, Equals, ErrInvalidRefSpec)
}

func (s *RemoteSuite) TestFetch(c *C) {
	url := s.GetBasicLocalRepositoryURL()
	sto := memory.NewStorage()
	r := newRemote(sto, nil, &config.RemoteConfig{Name: "foo", URL: url})

	refspec := config.RefSpec("+refs/heads/*:refs/remotes/origin/*")
	err := r.Fetch(&FetchOptions{
		RefSpecs: []config.RefSpec{refspec},
	})

	c.Assert(err, IsNil)
	c.Assert(sto.Objects, HasLen, 31)

	expectedRefs := []*plumbing.Reference{
		plumbing.NewReferenceFromStrings("refs/remotes/origin/master", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
		plumbing.NewReferenceFromStrings("refs/remotes/origin/branch", "e8d3ffab552895c19b9fcf7aa264d277cde33881"),
	}

	for _, exp := range expectedRefs {
		r, _ := sto.Reference(exp.Name())
		c.Assert(exp.String(), Equals, r.String())
	}
}

func (s *RemoteSuite) TestFetchDepth(c *C) {
	url := s.GetBasicLocalRepositoryURL()
	sto := memory.NewStorage()
	r := newRemote(sto, nil, &config.RemoteConfig{Name: "foo", URL: url})

	refspec := config.RefSpec("+refs/heads/*:refs/remotes/origin/*")
	err := r.Fetch(&FetchOptions{
		RefSpecs: []config.RefSpec{refspec},
		Depth:    1,
	})

	c.Assert(err, IsNil)
	c.Assert(sto.Objects, HasLen, 18)

	expectedRefs := []*plumbing.Reference{
		plumbing.NewReferenceFromStrings("refs/remotes/origin/master", "6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
		plumbing.NewReferenceFromStrings("refs/remotes/origin/branch", "e8d3ffab552895c19b9fcf7aa264d277cde33881"),
	}

	for _, exp := range expectedRefs {
		r, _ := sto.Reference(exp.Name())
		c.Assert(exp.String(), Equals, r.String())
	}

	h, err := sto.Shallow()
	c.Assert(err, IsNil)
	c.Assert(h, HasLen, 2)
	c.Assert(h, DeepEquals, []plumbing.Hash{
		plumbing.NewHash("e8d3ffab552895c19b9fcf7aa264d277cde33881"),
		plumbing.NewHash("6ecf0ef2c2dffb796033e5a02219af86ec6584e5"),
	})
}

func (s *RemoteSuite) TestFetchWithProgress(c *C) {
	url := s.GetBasicLocalRepositoryURL()
	sto := memory.NewStorage()
	buf := bytes.NewBuffer(nil)

	r := newRemote(sto, buf, &config.RemoteConfig{Name: "foo", URL: url})

	refspec := config.RefSpec("+refs/heads/*:refs/remotes/origin/*")
	err := r.Fetch(&FetchOptions{
		RefSpecs: []config.RefSpec{refspec},
	})

	c.Assert(err, IsNil)
	c.Assert(sto.Objects, HasLen, 31)

	c.Assert(buf.Len(), Not(Equals), 0)
}

type mockPackfileWriter struct {
	Storer
	PackfileWriterCalled bool
}

func (m *mockPackfileWriter) PackfileWriter() (io.WriteCloser, error) {
	m.PackfileWriterCalled = true
	return m.Storer.(storer.PackfileWriter).PackfileWriter()
}

func (s *RemoteSuite) TestFetchWithPackfileWriter(c *C) {
	dir, err := ioutil.TempDir("", "fetch")
	c.Assert(err, IsNil)

	defer os.RemoveAll(dir) // clean up

	fss, err := filesystem.NewStorage(osfs.New(dir))
	c.Assert(err, IsNil)

	mock := &mockPackfileWriter{Storer: fss}

	url := s.GetBasicLocalRepositoryURL()
	r := newRemote(mock, nil, &config.RemoteConfig{Name: "foo", URL: url})

	refspec := config.RefSpec("+refs/heads/*:refs/remotes/origin/*")
	err = r.Fetch(&FetchOptions{
		RefSpecs: []config.RefSpec{refspec},
	})

	c.Assert(err, IsNil)

	var count int
	iter, err := mock.IterEncodedObjects(plumbing.AnyObject)
	c.Assert(err, IsNil)

	iter.ForEach(func(plumbing.EncodedObject) error {
		count++
		return nil
	})

	c.Assert(count, Equals, 31)
	c.Assert(mock.PackfileWriterCalled, Equals, true)
}

func (s *RemoteSuite) TestFetchNoErrAlreadyUpToDate(c *C) {
	url := s.GetBasicLocalRepositoryURL()
	sto := memory.NewStorage()
	r := newRemote(sto, nil, &config.RemoteConfig{Name: "foo", URL: url})

	refspec := config.RefSpec("+refs/heads/*:refs/remotes/origin/*")
	o := &FetchOptions{
		RefSpecs: []config.RefSpec{refspec},
	}

	err := r.Fetch(o)
	c.Assert(err, IsNil)
	err = r.Fetch(o)
	c.Assert(err, Equals, NoErrAlreadyUpToDate)
}

func (s *RemoteSuite) TestString(c *C) {
	r := newRemote(nil, nil, &config.RemoteConfig{
		Name: "foo",
		URL:  "https://github.com/git-fixtures/basic.git",
	})

	c.Assert(r.String(), Equals, ""+
		"foo\thttps://github.com/git-fixtures/basic.git (fetch)\n"+
		"foo\thttps://github.com/git-fixtures/basic.git (push)",
	)
}