import * as events from 'events';
import {MergeExclusive} from 'type-fest';
import {AuthenticatedLnd, UnauthenticatedLnd} from '../lnd_grpc';

export type EmptyObject = {[key: string]: never};

export type AuthenticatedLightningArgs<TArgs = undefined> =
  TArgs extends undefined
    ? {lnd: AuthenticatedLnd}
    : TArgs & {lnd: AuthenticatedLnd};
export type UnauthenticatedLightningArgs<TArgs = undefined> =
  TArgs extends undefined
    ? {lnd: UnauthenticatedLnd}
    : TArgs & {lnd: UnauthenticatedLnd};

export type LightningError<TError = {err: Error}> = TError extends undefined
  ? [number, string]
  : [number, string, TError];

export type LightningCallback<TResult = void, TErrorDetails = any> = (
  error: LightningError<TErrorDetails> | undefined | null,
  result: TResult extends void ? undefined : TResult,
) => void;

export type LightningMethod<
  TArgs = EmptyObject,
  TResult = void,
  TErrorDetails = any,
> = {
  (args: TArgs): Promise<TResult>;
  (args: TArgs, callback: LightningCallback<TResult, TErrorDetails>): void;
};

export type AuthenticatedLightningMethod<
  TArgs extends {lnd: AuthenticatedLnd} = {lnd: AuthenticatedLnd},
  TResult = void,
  TErrorDetails = any,
> = LightningMethod<TArgs, TResult, TErrorDetails>;

export type UnauthenticatedLightningMethod<
  TArgs extends {lnd: UnauthenticatedLnd} = {lnd: UnauthenticatedLnd},
  TResult = void,
  TErrorDetails = any,
> = LightningMethod<TArgs, TResult, TErrorDetails>;

export type AuthenticatedLightningSubscription<
  TArgs extends {lnd: AuthenticatedLnd} = {lnd: AuthenticatedLnd},
> = (args: TArgs) => events.EventEmitter;

export type UnauthenticatedLightningSubscription<
  TArgs extends {lnd: UnauthenticatedLnd} = {lnd: UnauthenticatedLnd},
> = (args: TArgs) => events.EventEmitter;

type CommonStatus = 'IN_FLIGHT' | 'SUCCEEDED' | 'FAILED';

export type AttemptState = CommonStatus;

export type CommitmentType = 'ANCHORS' | 'STATIC_REMOTE_KEY' | 'LEGACY';

export type FailureReason =
  | 'FAILURE_REASON_INCORRECT_PAYMENT_DETAILS'
  | 'FAILURE_REASON_INSUFFICIENT_BALANCE'
  | 'FAILURE_REASON_TIMEOUT'
  | 'FAILURE_REASON_NO_ROUTE'
  | 'FAILURE_REASON_NONE';

export type HtlcState = 'ACCEPTED' | 'CANCELED' | 'SETTLED';
export type HtlcStatus = CommonStatus;
export type HtlcType = 'FORWARD' | 'RECEIVE' | 'SEND';

export type ResolutionOutcome = 'CLAIMED' | 'FIRST_STAGE' | 'TIMEOUT';
export type ResolutionType = 'COMMIT' | 'INCOMING_HTLC' | 'OUTGOING_HTLC';

export type SyncType = 'ACTIVE_SYNC' | 'PASSIVE_SYNC';

export type ForwardPaymentAction = 'RESUME' | 'FAIL' | 'SETTLE';

export type PaymentState =
  | CommonStatus
  | 'FAILED_ERROR'
  | 'FAILED_INSUFFICIENT_BALANCE'
  | 'FAILED_INCORRECT_PAYMENT_DETAILS'
  | 'FAILED_NO_ROUTE'
  | 'FAILED_TIMEOUT';
export type PaymentStatus = CommonStatus | 'UNKNOWN';

export type PaginationArgs = MergeExclusive<
  {
    /** Page Result Limit */
    limit?: number;
  },
  {
    /** Opaque Paging Token */
    token?: string;
  }
>;

export type DateRangeFilterArgs = {
  /** Creation Date After or Equal to ISO 8601 Date String */
  created_after?: string;
  /** Creation Date Before or Equal to ISO 8601 Date String */
  created_before?: string;
};

export type RouteNode = {
  /** Base Routing Fee In Millitokens */
  base_fee_mtokens?: string;
  /** Standard Format Channel Id */
  channel?: string;
  /** CLTV Blocks Delta */
  cltv_delta?: number;
  /** Fees Charged in Millitokens Per Million */
  fee_rate?: number;
  /** Forward Edge Public Key Hex */
  public_key: string;
};

export type Route = RouteNode[];

export type Routes = Route[];

export type UtxoSelection = 'largest' | 'random';

export interface ChannelPolicy {
  /** Base Fee Millitokens */
  base_fee_mtokens?: string;
  /** Locktime Delta */
  cltv_delta?: number;
  /** Fees Charged Per Million Millitokens */
  fee_rate?: number;
  /**
   * Source Based Base Fee Reduction String
   *
   * Not supported on LND 0.17.5 and below
   */
  inbound_base_discount_mtokens?: string;
  /**
   * Source Based Per Million Rate Reduction Number
   *
   * Not supported on LND 0.17.5 and below
   */
  inbound_rate_discount?: number;
  /** Channel Is Disabled */
  is_disabled?: boolean;
  /** Maximum HTLC Millitokens Value */
  max_htlc_mtokens?: string;
  /** Minimum HTLC Millitokens Value */
  min_htlc_mtokens?: string;
  /** Node Public Key */
  public_key: string;
  /** Policy Last Updated At ISO 8601 Date */
  updated_at?: string;
}