package index

import (
	"testing"

	. "gopkg.in/check.v1"
	"gopkg.in/src-d/go-git.v4/plumbing"
	"gopkg.in/src-d/go-git.v4/plumbing/format/index"
	"gopkg.in/src-d/go-git.v4/utils/merkletrie"
)

func Test(t *testing.T) { TestingT(t) }

type NoderSuite struct{}

var _ = Suite(&NoderSuite{})

func (s *NoderSuite) TestDiff(c *C) {
	indexA := &index.Index{
		Entries: []index.Entry{
			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	indexB := &index.Index{
		Entries: []index.Entry{
			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/qux", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	nodeA, err := NewRootNode(indexA)
	c.Assert(err, IsNil)
	nodeB, err := NewRootNode(indexB)
	c.Assert(err, IsNil)

	ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
	c.Assert(err, IsNil)
	c.Assert(ch, HasLen, 0)
}

func (s *NoderSuite) TestDiffChange(c *C) {
	indexA := &index.Index{
		Entries: []index.Entry{
			{Name: "bar/baz/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	indexB := &index.Index{
		Entries: []index.Entry{
			{Name: "bar/baz/foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	nodeA, err := NewRootNode(indexA)
	c.Assert(err, IsNil)
	nodeB, err := NewRootNode(indexB)
	c.Assert(err, IsNil)

	ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
	c.Assert(err, IsNil)
	c.Assert(ch, HasLen, 2)
}

func (s *NoderSuite) TestDiffDir(c *C) {
	indexA := &index.Index{
		Entries: []index.Entry{
			{Name: "foo", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	indexB := &index.Index{
		Entries: []index.Entry{
			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	nodeA, err := NewRootNode(indexA)
	c.Assert(err, IsNil)
	nodeB, err := NewRootNode(indexB)
	c.Assert(err, IsNil)

	ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
	c.Assert(err, IsNil)
	c.Assert(ch, HasLen, 2)
}

func (s *NoderSuite) TestDiffSameRoot(c *C) {
	indexA := &index.Index{
		Entries: []index.Entry{
			{Name: "foo.go", Hash: plumbing.NewHash("aab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	indexB := &index.Index{
		Entries: []index.Entry{
			{Name: "foo/bar", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
			{Name: "foo.go", Hash: plumbing.NewHash("8ab686eafeb1f44702738c8b0f24f2567c36da6d")},
		},
	}

	nodeA, err := NewRootNode(indexA)
	c.Assert(err, IsNil)
	nodeB, err := NewRootNode(indexB)
	c.Assert(err, IsNil)

	ch, err := merkletrie.DiffTree(nodeA, nodeB, IsEquals)
	c.Assert(err, IsNil)
	c.Assert(ch, HasLen, 1)
}