package virustotal

import (
	"context"
	"net/http"
	"strings"

	regexp "github.com/wasilibs/go-re2"

	"github.com/trufflesecurity/trufflehog/v3/pkg/common"
	"github.com/trufflesecurity/trufflehog/v3/pkg/detectors"
	"github.com/trufflesecurity/trufflehog/v3/pkg/pb/detector_typepb"
)

type Scanner struct{}

// Ensure the Scanner satisfies the interface at compile time.
var _ detectors.Detector = (*Scanner)(nil)

var (
	client = common.SaneHttpClient()

	// Make sure that your group is surrounded in boundary characters such as below to reduce false positives.
	keyPat = regexp.MustCompile(detectors.PrefixRegex([]string{"virustotal"}) + `\b([a-f0-9]{64})\b`)
)

// Keywords are used for efficiently pre-filtering chunks.
// Use identifiers in the secret preferably, or the provider name.
func (s Scanner) Keywords() []string {
	return []string{"virustotal"}
}

// FromData will find and optionally verify VirusTotal secrets in a given set of bytes.
func (s Scanner) FromData(ctx context.Context, verify bool, data []byte) (results []detectors.Result, err error) {
	dataStr := string(data)

	matches := keyPat.FindAllStringSubmatch(dataStr, -1)

	for _, match := range matches {
		resMatch := strings.TrimSpace(match[1])

		s1 := detectors.Result{
			DetectorType: detector_typepb.DetectorType_VirusTotal,
			Raw:          []byte(resMatch),
			SecretParts:  map[string]string{"key": resMatch},
		}

		if verify {
			s1.Verified = verifyToken(ctx, client, resMatch)
		}
		results = append(results, s1)
	}

	return results, nil
}

func verifyToken(ctx context.Context, client *http.Client, token string) bool {
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, "https://www.virustotal.com/api/v3/metadata", nil)
	if err != nil {
		return false
	}
	req.Header.Add("x-apikey", token)

	res, err := client.Do(req)
	if err != nil {
		return false
	}
	defer func() { _ = res.Body.Close() }()

	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return false
	}
	return true
}

func (s Scanner) Type() detector_typepb.DetectorType {
	return detector_typepb.DetectorType_VirusTotal
}

func (s Scanner) Description() string {
	return "VirusTotal is an online service that analyzes files and URLs for viruses, worms, trojans, and other kinds of malicious content. VirusTotal API keys can be used to access and integrate this service into applications."
}
