package cyclonedxhelpers

import (
	"time"

	"github.com/CycloneDX/cyclonedx-go"
	"github.com/anchore/syft/internal"
	"github.com/anchore/syft/internal/version"
	"github.com/anchore/syft/syft/linux"
	"github.com/anchore/syft/syft/sbom"
	"github.com/anchore/syft/syft/source"
	"github.com/google/uuid"
)

func ToFormatModel(s sbom.SBOM) *cyclonedx.BOM {
	cdxBOM := cyclonedx.NewBOM()
	versionInfo := version.FromBuild()

	// NOTE(jonasagx): cycloneDX requires URN uuids (URN returns the RFC 2141 URN form of uuid):
	// https://github.com/CycloneDX/specification/blob/master/schema/bom-1.3-strict.schema.json#L36
	// "pattern": "^urn:uuid:[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}$"
	cdxBOM.SerialNumber = uuid.New().URN()
	cdxBOM.Metadata = toBomDescriptor(internal.ApplicationName, versionInfo.Version, s.Source)

	packages := s.Artifacts.PackageCatalog.Sorted()
	components := make([]cyclonedx.Component, len(packages))
	for i, p := range packages {
		components[i] = Component(p)
	}
	components = append(components, toOSComponent(s.Artifacts.LinuxDistribution)...)
	cdxBOM.Components = &components
	return cdxBOM
}

func toOSComponent(distro *linux.Release) []cyclonedx.Component {
	if distro == nil {
		return []cyclonedx.Component{}
	}
	eRefs := &[]cyclonedx.ExternalReference{}
	if distro.BugReportURL != "" {
		*eRefs = append(*eRefs, cyclonedx.ExternalReference{
			URL:  distro.BugReportURL,
			Type: cyclonedx.ERTypeIssueTracker,
		})
	}
	if distro.HomeURL != "" {
		*eRefs = append(*eRefs, cyclonedx.ExternalReference{
			URL:  distro.HomeURL,
			Type: cyclonedx.ERTypeWebsite,
		})
	}
	if distro.SupportURL != "" {
		*eRefs = append(*eRefs, cyclonedx.ExternalReference{
			URL:     distro.SupportURL,
			Type:    cyclonedx.ERTypeOther,
			Comment: "support",
		})
	}
	if distro.PrivacyPolicyURL != "" {
		*eRefs = append(*eRefs, cyclonedx.ExternalReference{
			URL:     distro.PrivacyPolicyURL,
			Type:    cyclonedx.ERTypeOther,
			Comment: "privacyPolicy",
		})
	}
	if len(*eRefs) == 0 {
		eRefs = nil
	}
	props := getCycloneDXProperties(*distro)
	if len(*props) == 0 {
		props = nil
	}
	return []cyclonedx.Component{
		{
			Type:               cyclonedx.ComponentTypeOS,
			Name:               distro.Name,
			Version:            distro.Version,
			CPE:                distro.CPEName,
			ExternalReferences: eRefs,
			Properties:         props,
		},
	}
}

// NewBomDescriptor returns a new BomDescriptor tailored for the current time and "syft" tool details.
func toBomDescriptor(name, version string, srcMetadata source.Metadata) *cyclonedx.Metadata {
	return &cyclonedx.Metadata{
		Timestamp: time.Now().Format(time.RFC3339),
		Tools: &[]cyclonedx.Tool{
			{
				Vendor:  "anchore",
				Name:    name,
				Version: version,
			},
		},
		Component: toBomDescriptorComponent(srcMetadata),
	}
}

func toBomDescriptorComponent(srcMetadata source.Metadata) *cyclonedx.Component {
	switch srcMetadata.Scheme {
	case source.ImageScheme:
		return &cyclonedx.Component{
			Type:    cyclonedx.ComponentTypeContainer,
			Name:    srcMetadata.ImageMetadata.UserInput,
			Version: srcMetadata.ImageMetadata.ManifestDigest,
		}
	case source.DirectoryScheme, source.FileScheme:
		return &cyclonedx.Component{
			Type: cyclonedx.ComponentTypeFile,
			Name: srcMetadata.Path,
		}
	}

	return nil
}