package library

import (
	"io/ioutil"
	"os"

	detector "github.com/aquasecurity/trivy/pkg/detector/library"

	"github.com/aquasecurity/fanal/analyzer"
	_ "github.com/aquasecurity/fanal/analyzer/library/bundler"
	_ "github.com/aquasecurity/fanal/analyzer/library/cargo"
	_ "github.com/aquasecurity/fanal/analyzer/library/composer"
	_ "github.com/aquasecurity/fanal/analyzer/library/npm"
	_ "github.com/aquasecurity/fanal/analyzer/library/pipenv"
	_ "github.com/aquasecurity/fanal/analyzer/library/poetry"
	_ "github.com/aquasecurity/fanal/analyzer/library/yarn"
	"github.com/aquasecurity/fanal/extractor"
	"github.com/aquasecurity/trivy/pkg/types"
	"golang.org/x/xerrors"
)

type Scanner struct {
	detector detector.Operation
}

func NewScanner(detector detector.Operation) Scanner {
	return Scanner{detector: detector}
}

func (s Scanner) Scan(files extractor.FileMap) (map[string][]types.DetectedVulnerability, error) {
	results, err := analyzer.GetLibraries(files)
	if err != nil {
		return nil, xerrors.Errorf("failed to analyze libraries: %w", err)
	}

	vulnerabilities := map[string][]types.DetectedVulnerability{}
	for path, libs := range results {
		vulns, err := s.detector.Detect(string(path), libs)
		if err != nil {
			return nil, xerrors.Errorf("failed library scan: %w", err)
		}

		vulnerabilities[string(path)] = vulns
	}
	return vulnerabilities, nil
}

func (s Scanner) ScanFile(f *os.File) ([]types.DetectedVulnerability, error) {
	content, err := ioutil.ReadAll(f)
	if err != nil {
		return nil, err
	}
	files := extractor.FileMap{
		f.Name(): content,
	}

	results, err := s.Scan(files)
	if err != nil {
		return nil, err
	}

	// need only 1 result
	for _, vulns := range results {
		return vulns, nil
	}
	return nil, nil
}