package sonarcloud

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/detector_typepb"
)

type Scanner struct {
	client *http.Client
}

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

var (
	defaultClient = 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{"sonar"}) + `(?:^|[^@])\b([0-9a-z]{40})\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{"sonar"}
}

func (s Scanner) getClient() *http.Client {
	if s.client != nil {
		return s.client
	}

	return defaultClient
}

// FromData will find and optionally verify SonarCloud 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)

	uniqueTokenMatches := make(map[string]struct{})
	for _, match := range keyPat.FindAllStringSubmatch(dataStr, -1) {
		uniqueTokenMatches[match[1]] = struct{}{}
	}

	for match := range uniqueTokenMatches {
		s1 := detectors.Result{
			DetectorType: detector_typepb.DetectorType_SonarCloud,
			Raw:          []byte(match),
		}

		if verify {
			isVerified, verificationErr := s.verifyMatch(ctx, s.getClient(), match)
			s1.Verified = isVerified
			s1.SetVerificationError(verificationErr, match)
		}

		results = append(results, s1)
	}

	return results, nil
}

// verifyMatch attempts to validate a SonarCloud token.
func (s Scanner) verifyMatch(ctx context.Context, client *http.Client, token string) (bool, error) {
	url := "https://sonarcloud.io/api/authentication/validate"
	req, err := http.NewRequestWithContext(ctx, http.MethodGet, url, http.NoBody)
	if err != nil {
		return false, fmt.Errorf("failed to create request: %w", err)
	}

	req.SetBasicAuth(token, "")
	res, err := client.Do(req)
	if err != nil {
		return false, fmt.Errorf("failed to perform request: %w", err)
	}

	defer func() {
		_, _ = io.Copy(io.Discard, res.Body)
		_ = res.Body.Close()
	}()

	// The SonarCloud API always returns 200 OK, even for invalid tokens,
	// with the validity indicated in the JSON body.
	if res.StatusCode != http.StatusOK {
		// Treat any non-200 status as a failed attempt to verify.
		return false, fmt.Errorf("unexpected status code: %d", res.StatusCode)
	}

	bodyBytes, err := io.ReadAll(res.Body)
	if err != nil {
		return false, fmt.Errorf("failed to read response body: %w", err)
	}

	var resp struct {
		Valid bool `json:"valid"`
	}

	if err := json.Unmarshal(bodyBytes, &resp); err != nil {
		return false, fmt.Errorf("invalid JSON: %w", err)
	}

	return resp.Valid, nil
}

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

func (s Scanner) Description() string {
	return "SonarCloud is a cloud-based code quality and security service. SonarCloud tokens can be used to access project analysis and quality reports."
}
