package proxycfg

import (
	"context"

	cachetype "github.com/hashicorp/consul/agent/cache-types"
	"github.com/hashicorp/consul/agent/structs"
)

// UpdateEvent contains new data for a resource we are subscribed to (e.g. an
// agent cache entry).
type UpdateEvent struct {
	CorrelationID string
	Result        interface{}
	Err           error
}

// DataSources contains the dependencies used to consume data used to configure
// proxies.
type DataSources struct {
	// CARoots provides updates about the CA root certificates on a notification
	// channel.
	CARoots CARoots
	// CompiledDiscoveryChain provides updates about a service's discovery chain
	// on a notification channel.
	CompiledDiscoveryChain CompiledDiscoveryChain
	// ConfigEntry provides updates about a single config entry on a notification
	// channel.
	ConfigEntry ConfigEntry
	// ConfigEntryList provides updates about a list of config entries on a
	// notification channel.
	ConfigEntryList ConfigEntryList
	// Datacenters provides updates about federated datacenters on a notification
	// channel.
	Datacenters Datacenters
	// FederationStateListMeshGateways is the interface used to consume updates
	// about mesh gateways from the federation state.
	FederationStateListMeshGateways FederationStateListMeshGateways
	// GatewayServices provides updates about a gateway's upstream services on a
	// notification channel.
	GatewayServices GatewayServices
	// Health provides service health updates on a notification channel.
	Health Health
	// HTTPChecks provides updates about a service's HTTP and gRPC checks on a
	// notification channel.
	HTTPChecks HTTPChecks
	// Intentions provides intention updates on a notification channel.
	Intentions Intentions
	// IntentionUpstreams provides intention-inferred upstream updates on a
	// notification channel.
	IntentionUpstreams IntentionUpstreams
	// InternalServiceDump provides updates about a (gateway) service on a
	// notification channel.
	InternalServiceDump InternalServiceDump
	// LeafCertificate provides updates about the service's leaf certificate on a
	// notification channel.
	LeafCertificate LeafCertificate
	// PreparedQuery provides updates about the results of a prepared query.
	PreparedQuery PreparedQuery
	// ResolvedServiceConfig provides updates about a service's resolved config.
	ResolvedServiceConfig ResolvedServiceConfig
	// ServiceList provides updates about the list of all services in a datacenter
	// on a notification channel.
	ServiceList ServiceList

	DataSourcesEnterprise
}

// CARoots is the interface used to consume updates about the CA root
// certificates.
type CARoots interface {
	Notify(ctx context.Context, req *structs.DCSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}

// CompiledDiscoveryChain is the interface used to consume updates about the
// compiled discovery chain for a service.
type CompiledDiscoveryChain interface {
	Notify(ctx context.Context, req *structs.DiscoveryChainRequest, correlationID string, ch chan<- UpdateEvent) error
}

// ConfigEntry is the interface used to consume updates about a single config
// entry.
type ConfigEntry interface {
	Notify(ctx context.Context, req *structs.ConfigEntryQuery, correlationID string, ch chan<- UpdateEvent) error
}

// ConfigEntry is the interface used to consume updates about a list of config
// entries.
type ConfigEntryList interface {
	Notify(ctx context.Context, req *structs.ConfigEntryQuery, correlationID string, ch chan<- UpdateEvent) error
}

// Datacenters is the interface used to consume updates about federated
// datacenters.
type Datacenters interface {
	Notify(ctx context.Context, req *structs.DatacentersRequest, correlationID string, ch chan<- UpdateEvent) error
}

// FederationStateListMeshGateways is the interface used to consume updates
// about mesh gateways from the federation state.
type FederationStateListMeshGateways interface {
	Notify(ctx context.Context, req *structs.DCSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}

// GatewayServices is the interface used to consume updates about a gateway's
// upstream services.
type GatewayServices interface {
	Notify(ctx context.Context, req *structs.ServiceSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}

// Health is the interface used to consume service health updates.
type Health interface {
	Notify(ctx context.Context, req *structs.ServiceSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}

// HTTPChecks is the interface used to consume updates about a service's HTTP
// and gRPC-based checks (in order to determine which paths to expose through
// the proxy).
type HTTPChecks interface {
	Notify(ctx context.Context, req *cachetype.ServiceHTTPChecksRequest, correlationID string, ch chan<- UpdateEvent) error
}

// Intentions is the interface used to consume intention updates.
type Intentions interface {
	Notify(ctx context.Context, req *structs.IntentionQueryRequest, correlationID string, ch chan<- UpdateEvent) error
}

// IntentionUpstreams is the interface used to consume updates about upstreams
// inferred from service intentions.
type IntentionUpstreams interface {
	Notify(ctx context.Context, req *structs.ServiceSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}

// InternalServiceDump is the interface used to consume updates about a (gateway)
// service via the internal ServiceDump RPC.
type InternalServiceDump interface {
	Notify(ctx context.Context, req *structs.ServiceDumpRequest, correlationID string, ch chan<- UpdateEvent) error
}

// LeafCertificate is the interface used to consume updates about a service's
// leaf certificate.
type LeafCertificate interface {
	Notify(ctx context.Context, req *cachetype.ConnectCALeafRequest, correlationID string, ch chan<- UpdateEvent) error
}

// PreparedQuery is the interface used to consume updates about the results of
// a prepared query.
type PreparedQuery interface {
	Notify(ctx context.Context, req *structs.PreparedQueryExecuteRequest, correlationID string, ch chan<- UpdateEvent) error
}

// ResolvedServiceConfig is the interface used to consume updates about a
// service's resolved config.
type ResolvedServiceConfig interface {
	Notify(ctx context.Context, req *structs.ServiceConfigRequest, correlationID string, ch chan<- UpdateEvent) error
}

// ServiceList is the interface used to consume updates about the list of
// all services in a datacenter.
type ServiceList interface {
	Notify(ctx context.Context, req *structs.DCSpecificRequest, correlationID string, ch chan<- UpdateEvent) error
}