// Package model holds the compact enums and hot-path structs shared by the
// classifier, pipeline and store.
package model

// Provider identifies a cloud/database/storage provider.
type Provider uint8

const (
	ProviderUnknown Provider = iota
	ProviderAWS
	ProviderAzure
	ProviderGCP
	ProviderCloudflare
	ProviderDigitalOcean
	ProviderSupabase
	ProviderOracle
)

func (p Provider) String() string {
	switch p {
	case ProviderAWS:
		return "aws"
	case ProviderAzure:
		return "azure"
	case ProviderGCP:
		return "gcp"
	case ProviderCloudflare:
		return "cloudflare"
	case ProviderDigitalOcean:
		return "digitalocean"
	case ProviderSupabase:
		return "supabase"
	case ProviderOracle:
		return "oracle"
	default:
		return "unknown"
	}
}

// Service identifies the provider service the resource belongs to.
type Service uint8

const (
	ServiceUnknown Service = iota

	ServiceObjectStorage
	ServiceS3
	ServiceBlobStorage
	ServiceDatabase
	ServicePostgres
	ServiceMySQL
	ServiceRDS
	ServiceDocumentDB
	ServiceRedshift
	ServiceOpenSearch
	ServiceNeptune
	ServiceRedis
	ServiceMemoryDB
	ServiceCosmosDB
	ServiceFirebaseDB
	ServiceElastiCache
	ServiceSearch
	ServiceQueue
	ServiceFileStorage
	ServiceTableStorage
	ServiceWebApp
)

func (s Service) String() string {
	switch s {
	case ServiceObjectStorage:
		return "object_storage"
	case ServiceS3:
		return "s3"
	case ServiceBlobStorage:
		return "blob_storage"
	case ServiceDatabase:
		return "database"
	case ServicePostgres:
		return "postgres"
	case ServiceMySQL:
		return "mysql"
	case ServiceRDS:
		return "rds"
	case ServiceDocumentDB:
		return "documentdb"
	case ServiceRedshift:
		return "redshift"
	case ServiceOpenSearch:
		return "opensearch"
	case ServiceNeptune:
		return "neptune"
	case ServiceRedis:
		return "redis"
	case ServiceMemoryDB:
		return "memorydb"
	case ServiceCosmosDB:
		return "cosmosdb"
	case ServiceFirebaseDB:
		return "firebase_db"
	case ServiceElastiCache:
		return "elasticache"
	case ServiceSearch:
		return "search"
	case ServiceQueue:
		return "queue"
	case ServiceFileStorage:
		return "file_storage"
	case ServiceTableStorage:
		return "table_storage"
	case ServiceWebApp:
		return "web_app"
	default:
		return "unknown"
	}
}

// Source is where a candidate was discovered.
type Source uint8

const (
	SourceUnknown Source = iota
	SourceDirectCT
	SourceCNAME
	SourceDNSAlias
)

func (s Source) String() string {
	switch s {
	case SourceDirectCT:
		return "direct_ct"
	case SourceCNAME:
		return "cname"
	case SourceDNSAlias:
		return "dns_alias"
	default:
		return "unknown"
	}
}

// PublicSemantic captures when the hostname format itself carries public
// accessibility meaning. It never asserts that data is actually exposed.
type PublicSemantic uint8

const (
	PublicSemanticNone PublicSemantic = iota
	PublicSemanticPublicEndpoint
	PublicSemanticVPCEndpoint
	PublicSemanticPublicURL
)

func (p PublicSemantic) String() string {
	switch p {
	case PublicSemanticPublicEndpoint:
		return "public_endpoint"
	case PublicSemanticVPCEndpoint:
		return "vpc_endpoint"
	case PublicSemanticPublicURL:
		return "public_url"
	default:
		return "none"
	}
}

// ExposureState is the outcome of an optional safe reachability check.
type ExposureState uint8

const (
	ExposureUnknown ExposureState = iota
	ExposurePublicDNS
	ExposureReachable
	ExposureAuthRequired
	ExposurePublicRead
	ExposurePrivate
	ExposureNotFound
)

func (e ExposureState) String() string {
	switch e {
	case ExposurePublicDNS:
		return "public_dns"
	case ExposureReachable:
		return "reachable"
	case ExposureAuthRequired:
		return "auth_required"
	case ExposurePublicRead:
		return "public_read"
	case ExposurePrivate:
		return "private"
	case ExposureNotFound:
		return "not_found"
	default:
		return "unknown"
	}
}

// Match is the compact result of classifying a single hostname. The string
// fields are substrings of the input hostname (zero-copy).
type Match struct {
	Provider         Provider
	Service          Service
	PublicSemantic   PublicSemantic
	ResourceSpecific bool
	Region           string
	Resource         string
}

// Candidate is a provider resource discovered directly or through DNS.
type Candidate struct {
	Hostname         string // hostname that matched (provider hostname)
	Original         string // original CT hostname (equal to Hostname for direct matches)
	Region           string
	Resource         string
	Provider         Provider
	Service          Service
	Source           Source
	PublicSemantic   PublicSemantic
	ResourceSpecific bool
}