package typetalk

import (
	"context"
	"fmt"
	"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 {
	detectors.DefaultMultiPartCredentialProvider
}

// 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{"typetalk"}) + `\b([0-9a-zA-Z]{64})\b`)
	idPat  = regexp.MustCompile(detectors.PrefixRegex([]string{"typetalk"}) + `\b([0-9a-zA-Z]{32})\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{"typetalk"}
}

// FromData will find and optionally verify Typetalk 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)
	idMatches := idPat.FindAllStringSubmatch(dataStr, -1)

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

		for _, idMatch := range idMatches {

			resIdMatch := strings.TrimSpace(idMatch[1])
			s1 := detectors.Result{
				DetectorType: detector_typepb.DetectorType_Typetalk,
				Raw:          []byte(resMatch),
				SecretParts:  map[string]string{"key": resMatch},
			}

			if verify {
				req, err := http.NewRequestWithContext(ctx, "POST", fmt.Sprintf("https://typetalk.com/oauth2/access_token?client_id=%s&client_secret=%s&grant_type=client_credentials", resIdMatch, resMatch), nil)
				if err != nil {
					continue
				}
				res, err := client.Do(req)
				if err == nil {
					defer func() { _ = res.Body.Close() }()
					if res.StatusCode >= 200 && res.StatusCode < 300 {
						s1.Verified = true
					}
				}
			}

			results = append(results, s1)
		}

	}
	return results, nil
}

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

func (s Scanner) Description() string {
	return "Typetalk is a Japanese chat app. API keys can be used to read potentially sensitive chat messages."
}
