package denodeploy

import (
	"context"
	"encoding/json"
	"fmt"
	"io"
	"net/http"

	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/detectorspb"
)

type Scanner struct {
	client *http.Client
}

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

var (
	defaultClient = common.SaneHttpClient()
	tokenPat      = regexp.MustCompile(`\b(dd[pw]_[a-zA-Z0-9]{36})\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{"ddp_", "ddw_"}
}

type userResponse struct {
	Login string `json:"login"`
}

// FromData will find and optionally verify DenoDeploy 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)

	tokenMatches := tokenPat.FindAllStringSubmatch(dataStr, -1)

	for _, tokenMatch := range tokenMatches {
		token := tokenMatch[1]

		s1 := detectors.Result{
			DetectorType: s.Type(),
			Raw:          []byte(token),
		}

		if verify {
			client := s.client
			if client == nil {
				client = defaultClient
			}

			req, err := http.NewRequestWithContext(ctx, "GET", "https://api.deno.com/user", nil)
			req.Header.Set("Authorization", "Bearer "+token)
			if err != nil {
				continue
			}

			res, err := client.Do(req)
			if err == nil {
				defer res.Body.Close()
				if res.StatusCode == 200 {
					s1.Verified = true

					body, err := io.ReadAll(res.Body)
					if err != nil {
						s1.SetVerificationError(err, token)
					} else {
						var user userResponse
						if err := json.Unmarshal(body, &user); err != nil {
							s1.SetVerificationError(err, token)
						} else {
							s1.ExtraData = map[string]string{
								"login": user.Login,
							}
						}
					}
				} else if res.StatusCode == 401 {
					// The secret is determinately not verified (nothing to do)
				} else {
					err = fmt.Errorf("unexpected HTTP response status %d", res.StatusCode)
					s1.SetVerificationError(err, token)
				}
			} else {
				s1.SetVerificationError(err, token)
			}
		}

		results = append(results, s1)
	}

	return results, nil
}

func (s Scanner) Type() detectorspb.DetectorType {
	return detectorspb.DetectorType_DenoDeploy
}
