package lncfg

import "fmt"

// WtClient holds the configuration options for the daemon's watchtower client.
//
//nolint:lll
type WtClient struct {
	// Active determines whether a watchtower client should be created to
	// back up channel states with registered watchtowers.
	Active bool `long:"active" description:"Whether the daemon should use private watchtowers to back up revoked channel states."`

	// PrivateTowerURIs specifies the lightning URIs of the towers the
	// watchtower client should send new backups to.
	PrivateTowerURIs []string `long:"private-tower-uris" description:"(Deprecated) Specifies the URIs of private watchtowers to use in backing up revoked states. URIs must be of the form <pubkey>@<addr>. Only 1 URI is supported at this time, if none are provided the tower will not be enabled."`

	// SweepFeeRate specifies the fee rate in sat/byte to be used when
	// constructing justice transactions sent to the tower.
	SweepFeeRate uint64 `long:"sweep-fee-rate" description:"Specifies the fee rate in sat/byte to be used when constructing justice transactions sent to the watchtower."`

	// SessionCloseRange is the range over which to choose a random number
	// of blocks to wait after the last channel of a session is closed
	// before sending the DeleteSession message to the tower server.
	SessionCloseRange uint32 `long:"session-close-range" description:"The range over which to choose a random number of blocks to wait after the last channel of a session is closed before sending the DeleteSession message to the tower server. Set to 1 for no delay."`

	// MaxTasksInMemQueue is the maximum number of back-up tasks that should
	// be queued in memory before overflowing to disk.
	MaxTasksInMemQueue uint64 `long:"max-tasks-in-mem-queue" description:"The maximum number of updates that should be queued in memory before overflowing to disk."`

	// MaxUpdates is the maximum number of updates to be backed up in a
	// single tower sessions.
	MaxUpdates uint16 `long:"max-updates" description:"The maximum number of updates to be backed up in a single session."`
}

// Validate ensures the user has provided a valid configuration.
//
// NOTE: Part of the Validator interface.
func (c *WtClient) Validate() error {
	// TODO(wilmer): remove in v0.9.0 release.
	if len(c.PrivateTowerURIs) > 0 {
		return fmt.Errorf("the `wtclient.private-tower-uris` option " +
			"has been deprecated as of v0.8.0-beta and will be " +
			"removed in v0.9.0-beta. To setup watchtowers for " +
			"the client, set `wtclient.active` and run " +
			"`lncli wtclient -h` for more information")
	}

	return nil
}

// Compile-time constraint to ensure WtClient implements the Validator
// interface.
var _ Validator = (*WtClient)(nil)