package engine

import (
	"fmt"
	"runtime"

	"github.com/go-errors/errors"
	gogit "github.com/go-git/go-git/v5"
	"google.golang.org/protobuf/proto"
	"google.golang.org/protobuf/types/known/anypb"

	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
	"github.com/trufflesecurity/trufflehog/v3/pkg/context"
	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/sourcespb"
	"github.com/trufflesecurity/trufflehog/v3/pkg/sources"
	"github.com/trufflesecurity/trufflehog/v3/pkg/sources/git"
)

// ScanGit scans any git source.
func (e *Engine) ScanGit(ctx context.Context, c sources.GitConfig) error {
	logOptions := &gogit.LogOptions{}
	opts := []git.ScanOption{
		git.ScanOptionFilter(c.Filter),
		git.ScanOptionLogOptions(logOptions),
	}

	if c.MaxDepth != 0 {
		opts = append(opts, git.ScanOptionMaxDepth(int64(c.MaxDepth)))
	}
	if c.BaseRef != "" {
		opts = append(opts, git.ScanOptionBaseHash(c.BaseRef))
	}
	if c.HeadRef != "" {
		opts = append(opts, git.ScanOptionHeadCommit(c.HeadRef))
	}
	if c.ExcludeGlobs != nil {
		opts = append(opts, git.ScanOptionExcludeGlobs(c.ExcludeGlobs))
	}
	scanOptions := git.NewScanOptions(opts...)

	connection := &sourcespb.Git{
		// Using Directories here allows us to not pass any
		// authentication. Also by this point, the c.RepoPath should
		// still have been prepared and downloaded to a temporary
		// directory if it was a URL.
		Directories: []string{c.RepoPath},
	}
	var conn anypb.Any
	err := anypb.MarshalFrom(&conn, connection, proto.MarshalOptions{})
	if err != nil {
		ctx.Logger().Error(err, "failed to marshal git connection")
		return err
	}

	gitSource := git.Source{}
	if err := gitSource.Init(ctx, "trufflehog - git", 0, 0, true, &conn, runtime.NumCPU()); err != nil {
		return errors.WrapPrefix(err, "could not init git source", 0)
	}
	gitSource.WithScanOptions(scanOptions)
	// Don't try to clean up the provided directory. That's handled by the
	// caller of ScanGit.
	gitSource.WithPreserveTempDirs(true)

	ctx = context.WithValues(ctx,
		"source_type", sourcespb.SourceType_SOURCE_TYPE_GIT.String(),
		"source_name", "git",
	)
	e.sourcesWg.Go(func() error {
		defer common.RecoverWithExit(ctx)
		err := gitSource.Chunks(ctx, e.ChunksChan())
		if err != nil {
			return fmt.Errorf("could not scan repo: %w", err)
		}
		return nil
	})
	return nil
}