package engine

import (
	"net/url"
	"os"
	"os/exec"
	"path/filepath"
	"runtime"
	"testing"
	"time"

	"github.com/stretchr/testify/assert"

	"github.com/trufflesecurity/trufflehog/v3/pkg/context"
	"github.com/trufflesecurity/trufflehog/v3/pkg/decoders"
	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
	"github.com/trufflesecurity/trufflehog/v3/pkg/engine/defaults"
	"github.com/trufflesecurity/trufflehog/v3/pkg/feature"
	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/source_metadatapb"
	"github.com/trufflesecurity/trufflehog/v3/pkg/sources"
	"github.com/trufflesecurity/trufflehog/v3/pkg/sources/git"
)

type expResult struct {
	B          string
	LineNumber int64
	Verified   bool
}

type discardPrinter struct{}

func (p *discardPrinter) Print(context.Context, *detectors.ResultWithMetadata) error {
	// This method intentionally does nothing.
	return nil
}

func TestGitEngine(t *testing.T) {
	ctx := context.Background()
	repoUrl := "https://github.com/dustin-decker/secretsandstuff.git"
	path, _, err := git.PrepareRepo(ctx, repoUrl, "", false, false)
	if err != nil {
		t.Error(err)
	}
	defer func() { _ = os.RemoveAll(path) }()

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()
	type testProfile struct {
		expected map[string]expResult
		branch   string
		base     string
		maxDepth int
	}
	for tName, tTest := range map[string]testProfile{
		"all_secrets": {
			expected: map[string]expResult{
				"70001020fab32b1fcf2f1f0e5c66424eae649826": {"AKIAXYZDQCEN4B6JSJQI", 2, true},
				"84e9c75e388ae3e866e121087ea2dd45a71068f2": {"AKIAILE3JG6KMS3HZGCA", 4, true},
				"8afb0ecd4998b1179e428db5ebbcdc8221214432": {"369963c1434c377428ca8531fbc46c0c43d037a0", 3, false},
				"27fbead3bf883cdb7de9d7825ed401f28f9398f1": {"ffc7e0f9400fb6300167009e42d2f842cd7956e2", 7, false},
			},
		},
		"base_commit": {
			expected: map[string]expResult{
				"70001020fab32b1fcf2f1f0e5c66424eae649826": {"AKIAXYZDQCEN4B6JSJQI", 2, true},
			},
			base: "2f251b8c1e72135a375b659951097ec7749d4af9",
		},
	} {
		t.Run(tName, func(t *testing.T) {
			const defaultOutputBufferSize = 64
			opts := []func(*sources.SourceManager){
				sources.WithSourceUnits(),
				sources.WithBufferedOutput(defaultOutputBufferSize),
			}

			sourceManager := sources.NewManager(opts...)

			conf := Config{
				Concurrency:   1,
				Decoders:      decoders.DefaultDecoders(),
				Detectors:     defaults.DefaultDetectors(),
				Verify:        true,
				SourceManager: sourceManager,
				Dispatcher:    NewPrinterDispatcher(new(discardPrinter)),
			}

			e, err := NewEngine(ctx, &conf)
			assert.NoError(t, err)

			e.Start(ctx)

			cfg := sources.GitConfig{
				URI:      path,
				HeadRef:  tTest.branch,
				BaseRef:  tTest.base,
				MaxDepth: tTest.maxDepth,
			}
			if _, err := e.ScanGit(ctx, cfg); err != nil {
				return
			}

			// Wait for all the chunks to be processed.
			assert.Nil(t, e.Finish(ctx))
			for result := range e.ResultsChan() {
				switch meta := result.SourceMetadata.GetData().(type) {
				case *source_metadatapb.MetaData_Git:
					if tTest.expected[meta.Git.Commit].B != string(result.Raw) {
						t.Errorf("%s: unexpected result. Got: %s, Expected: %s", tName, string(result.Raw), tTest.expected[meta.Git.Commit].B)
					}
					if tTest.expected[meta.Git.Commit].LineNumber != result.SourceMetadata.GetGit().Line {
						t.Errorf("%s: unexpected line number. Got: %d, Expected: %d", tName, result.SourceMetadata.GetGit().Line, tTest.expected[meta.Git.Commit].LineNumber)
					}
					if tTest.expected[meta.Git.Commit].Verified != result.Verified {
						t.Errorf("%s: unexpected verification. Got: %v, Expected: %v", tName, result.Verified, tTest.expected[meta.Git.Commit].Verified)
					}
				}

			}
			metrics := e.GetMetrics()
			assert.Equal(t, len(tTest.expected), int(metrics.VerifiedSecretsFound)+int(metrics.UnverifiedSecretsFound))
		})
	}
}

func TestGitEngineWithMirrorAndBareClones(t *testing.T) {
	ctx := context.Background()

	parent, err := os.MkdirTemp("", "trufflehog-test-keys-*")
	if err != nil {
		t.Fail()
	}
	defer func() { _ = os.RemoveAll(parent) }()
	localRepo := filepath.Join(parent, "test_keys.git")
	cloneCtx, cancel := context.WithTimeout(ctx, 10*time.Second)
	defer cancel()

	// clone with --mirror and --bare from https://github.com/trufflesecurity/test_keys.git to local and then pass it in as a local path
	cloneCmd := exec.CommandContext(cloneCtx, "git", "clone", "--mirror", "--bare", "https://github.com/trufflesecurity/test_keys.git", localRepo)
	if _, err := cloneCmd.CombinedOutput(); err != nil {
		t.Fail()
	}

	fileURI := (&url.URL{Scheme: "file", Path: filepath.ToSlash(localRepo)}).String()

	run := func(t *testing.T, mirror bool, cfg sources.GitConfig) (uint64, uint64) {
		t.Helper()

		const defaultOutputBufferSize = 64
		opts := []func(*sources.SourceManager){
			sources.WithSourceUnits(),
			sources.WithBufferedOutput(defaultOutputBufferSize),
		}
		sourceManager := sources.NewManager(opts...)

		conf := Config{
			Concurrency:   1,
			Decoders:      decoders.DefaultDecoders(),
			Detectors:     defaults.DefaultDetectors(),
			Verify:        false, // avoid network-dependent verification in tests
			SourceManager: sourceManager,
			Dispatcher:    NewPrinterDispatcher(new(discardPrinter)),
		}

		feature.UseGitMirror.Store(false)
		if mirror {
			feature.UseGitMirror.Store(true)
			defer feature.UseGitMirror.Store(false)
		}

		e, err := NewEngine(ctx, &conf)
		assert.NoError(t, err)

		e.Start(ctx)
		_, err = e.ScanGit(ctx, cfg)
		assert.NoError(t, err)
		assert.NoError(t, e.Finish(ctx))

		m := e.GetMetrics()
		secrets := m.VerifiedSecretsFound + m.UnverifiedSecretsFound
		bytes := m.BytesScanned
		return secrets, bytes
	}

	s1, b1 := run(t, true, sources.GitConfig{URI: "https://github.com/trufflesecurity/test_keys.git"})
	s2, b2 := run(t, false, sources.GitConfig{URI: fileURI, Bare: true})
	s3, b3 := run(t, false, sources.GitConfig{URI: fileURI, Bare: true, TrustLocalGitConfig: true})

	assert.Greater(t, int(s1), 0)
	assert.Greater(t, int(b1), 0)

	assert.Equal(t, s1, s2)
	assert.Equal(t, s1, s3)
	assert.Equal(t, b1, b2)
	assert.Equal(t, b1, b3)
}

func BenchmarkGitEngine(b *testing.B) {
	ctx := context.Background()
	repoUrl := "https://github.com/dustin-decker/secretsandstuff.git"

	ctx, cancel := context.WithCancel(ctx)
	defer cancel()

	const defaultOutputBufferSize = 64
	opts := []func(*sources.SourceManager){
		sources.WithSourceUnits(),
		sources.WithBufferedOutput(defaultOutputBufferSize),
	}

	sourceManager := sources.NewManager(opts...)

	conf := Config{
		Concurrency:   runtime.NumCPU(),
		Decoders:      decoders.DefaultDecoders(),
		Detectors:     defaults.DefaultDetectors(),
		Verify:        false,
		SourceManager: sourceManager,
		Dispatcher:    NewPrinterDispatcher(new(discardPrinter)),
	}

	e, err := NewEngine(ctx, &conf)
	assert.NoError(b, err)

	go func() {
		resultCount := 0
		for range e.ResultsChan() {
			resultCount++
		}
	}()

	cfg := sources.GitConfig{URI: repoUrl}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		if _, err := e.ScanGit(ctx, cfg); err != nil {
			return
		}
	}
	assert.Nil(b, e.Finish(ctx))
}
