package hercules

import (
	"io/ioutil"
	"path"
	"testing"
	"unicode/utf8"

	"github.com/gogo/protobuf/proto"
	"github.com/sergi/go-diff/diffmatchpatch"
	"github.com/stretchr/testify/assert"
	"gopkg.in/bblfsh/sdk.v1/uast"
	"gopkg.in/src-d/go-git.v4/plumbing/object"
)

func fixtureFileDiffRefiner() *FileDiffRefiner {
	fd := &FileDiffRefiner{}
	fd.Initialize(testRepository)
	return fd
}

func TestFileDiffRefinerMeta(t *testing.T) {
	fd := fixtureFileDiffRefiner()
	assert.Equal(t, fd.Name(), "FileDiffRefiner")
	assert.Equal(t, len(fd.Provides()), 1)
	assert.Equal(t, fd.Provides()[0], DependencyFileDiff)
	assert.Equal(t, len(fd.Requires()), 2)
	assert.Equal(t, fd.Requires()[0], DependencyFileDiff)
	assert.Equal(t, fd.Requires()[1], DependencyUastChanges)
	assert.Len(t, fd.ListConfigurationOptions(), 0)
	fd.Configure(nil)
	features := fd.Features()
	assert.Len(t, features, 1)
	assert.Equal(t, features[0], FeatureUast)
}

func TestFileDiffRefinerRegistration(t *testing.T) {
	tp, exists := Registry.registered[(&FileDiffRefiner{}).Name()]
	assert.True(t, exists)
	assert.Equal(t, tp.Elem().Name(), "FileDiffRefiner")
	tps, exists := Registry.provided[(&FileDiffRefiner{}).Provides()[0]]
	assert.True(t, exists)
	assert.True(t, len(tps) >= 1)
	matched := false
	for _, tp := range tps {
		matched = matched || tp.Elem().Name() == "FileDiffRefiner"
	}
	assert.True(t, matched)
}

func TestFileDiffRefinerConsume(t *testing.T) {
	bytes1, err := ioutil.ReadFile(path.Join("test_data", "1.java"))
	assert.Nil(t, err)
	bytes2, err := ioutil.ReadFile(path.Join("test_data", "2.java"))
	assert.Nil(t, err)
	dmp := diffmatchpatch.New()
	src, dst, _ := dmp.DiffLinesToRunes(string(bytes1), string(bytes2))
	state := map[string]interface{}{}
	fileDiffs := map[string]FileDiffData{}
	const fileName = "test.java"
	fileDiffs[fileName] = FileDiffData{
		OldLinesOfCode: len(src),
		NewLinesOfCode: len(dst),
		Diffs:          dmp.DiffMainRunes(src, dst, false),
	}
	state[DependencyFileDiff] = fileDiffs
	uastChanges := make([]UASTChange, 1)
	loadUast := func(name string) *uast.Node {
		bytes, err := ioutil.ReadFile(path.Join("test_data", name))
		assert.Nil(t, err)
		node := uast.Node{}
		proto.Unmarshal(bytes, &node)
		return &node
	}
	state[DependencyUastChanges] = uastChanges
	uastChanges[0] = UASTChange{
		Change: &object.Change{
			From: object.ChangeEntry{Name: fileName},
			To:   object.ChangeEntry{Name: fileName}},
		Before: loadUast("uast1.pb"), After: loadUast("uast2.pb"),
	}
	fd := fixtureFileDiffRefiner()
	iresult, err := fd.Consume(state)
	assert.Nil(t, err)
	result := iresult[DependencyFileDiff].(map[string]FileDiffData)
	assert.Len(t, result, 1)

	oldDiff := fileDiffs[fileName]
	newDiff := result[fileName]
	assert.Equal(t, oldDiff.OldLinesOfCode, newDiff.OldLinesOfCode)
	assert.Equal(t, oldDiff.NewLinesOfCode, newDiff.NewLinesOfCode)
	assert.Equal(t, len(oldDiff.Diffs)+1, len(newDiff.Diffs))
	assert.Equal(t, dmp.DiffText2(oldDiff.Diffs), dmp.DiffText2(newDiff.Diffs))
	// Some hardcoded length checks
	assert.Equal(t, utf8.RuneCountInString(newDiff.Diffs[5].Text), 11)
	assert.Equal(t, utf8.RuneCountInString(newDiff.Diffs[6].Text), 41)
	assert.Equal(t, utf8.RuneCountInString(newDiff.Diffs[7].Text), 231)
}