package server

import (
	"context"
	"time"

	"github.com/hashicorp/nodeenrollment/types"
)

// getOpts - iterate the inbound Options and return a struct
func getOpts(opt ...Option) options {
	opts := getDefaultOptions()
	for _, o := range opt {
		o(&opts)
	}
	return opts
}

// Option - how Options are passed as arguments
type Option func(*options)

// options = how options are represented
type options struct {
	withName                           string
	withPublicId                       string
	withDescription                    string
	withAddress                        string
	withLimit                          int
	withLiveness                       time.Duration
	withUpdateTags                     bool
	withWorkerTags                     []*Tag
	withWorkerKeyIdentifier            string
	withWorkerKeys                     WorkerKeys
	withControllerEncryptionPrivateKey []byte
	withKeyId                          string
	withNonce                          []byte
	withNewIdFunc                      func(context.Context) (string, error)
	withFetchNodeCredentialsRequest    *types.FetchNodeCredentialsRequest
	withTestPkiWorkerAuthorized        bool
	withTestPkiWorkerKeyId             *string
}

func getDefaultOptions() options {
	return options{
		withNewIdFunc: newWorkerId,
	}
}

// WithDescription provides an optional description.
func WithDescription(desc string) Option {
	return func(o *options) {
		o.withDescription = desc
	}
}

// WithName provides an optional name.
func WithName(name string) Option {
	return func(o *options) {
		o.withName = name
	}
}

// WithPublicId provides an optional public Id used for skipping one db call.
func WithPublicId(id string) Option {
	return func(o *options) {
		o.withPublicId = id
	}
}

// WithAddress provides an optional address.
func WithAddress(address string) Option {
	return func(o *options) {
		o.withAddress = address
	}
}

// WithLimit provides an option to provide a limit.  Intentionally allowing
// negative integers.   If WithLimit < 0, then unlimited results are returned.
// If WithLimit == 0, then default limits are used for results.
func WithLimit(limit int) Option {
	return func(o *options) {
		o.withLimit = limit
	}
}

// WithLiveness indicates how far back we want to search for server entries.
// Use 0 for the default liveness (15 seconds). A liveness value of -1 removes
// the liveliness condition.
func WithLiveness(liveness time.Duration) Option {
	return func(o *options) {
		o.withLiveness = liveness
	}
}

// WithUpdateTags indicates that we should perform tag updates in the DB.
// This would happen on first sync from a worker after startup or (eventually,
// perhaps), after a SIGHUP.
func WithUpdateTags(updateTags bool) Option {
	return func(o *options) {
		o.withUpdateTags = updateTags
	}
}

// WithWorkerTags provides worker tags.
func WithWorkerTags(tags ...*Tag) Option {
	return func(o *options) {
		o.withWorkerTags = tags
	}
}

func WithWorkerKeyIdentifier(workerKeyIdentifier string) Option {
	return func(o *options) {
		o.withWorkerKeyIdentifier = workerKeyIdentifier
	}
}

func WithWorkerKeys(workerKeys WorkerKeys) Option {
	return func(o *options) {
		o.withWorkerKeys = workerKeys
	}
}

func WithControllerEncryptionPrivateKey(controllerKey []byte) Option {
	return func(o *options) {
		o.withControllerEncryptionPrivateKey = controllerKey
	}
}

func WithKeyId(keyId string) Option {
	return func(o *options) {
		o.withKeyId = keyId
	}
}

func WithNonce(nonce []byte) Option {
	return func(o *options) {
		o.withNonce = nonce
	}
}

// WithNewIdFunc allows an optional factory function for new worker IDs to be
// specified (this option is likely only useful for tests).
func WithNewIdFunc(fn func(context.Context) (string, error)) Option {
	return func(o *options) {
		o.withNewIdFunc = fn
	}
}

// WithFetchNodeCredentialsRequest allows an optional
// FetchNodeCredentialsRequest to be specified.
func WithFetchNodeCredentialsRequest(req *types.FetchNodeCredentialsRequest) Option {
	return func(o *options) {
		o.withFetchNodeCredentialsRequest = req
	}
}

// WithTestPkiWorkerAuthorizedKeyId should only be used in tests.
// It specifies that the test worker should be authorized when returned and
// assigns the key id for that worker to the string pointer in this option.
func WithTestPkiWorkerAuthorizedKeyId(id *string) Option {
	return func(o *options) {
		o.withTestPkiWorkerAuthorized = true
		o.withTestPkiWorkerKeyId = id
	}
}