/*
 This file is part of GNU Taler
 (C) 2019-2023 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */

/**
 * Type and schema definitions for notifications from the wallet to clients
 * of the wallet.
 */

/**
 * Imports.
 */
import { CancellationToken } from "./CancellationToken.js";
import { AbsoluteTime } from "./time.js";
import { TransactionState } from "./transactions-types.js";
import { ExchangeEntryState, TalerErrorDetail } from "./wallet-types.js";

export enum NotificationType {
  BalanceChange = "balance-change",
  BackupOperationError = "backup-error",
  TransactionStateTransition = "transaction-state-transition",
  WithdrawalOperationTransition = "withdrawal-operation-transition",
  ExchangeStateTransition = "exchange-state-transition",
  TaskObservabilityEvent = "task-observability-event",
  RequestObservabilityEvent = "request-observability-event",
}

export interface ErrorInfoSummary {
  code: number;
  hint?: string;
  message?: string;
}

export interface TransactionStateTransitionNotification {
  type: NotificationType.TransactionStateTransition;
  transactionId: string;
  oldTxState: TransactionState;
  newTxState: TransactionState;
  errorInfo?: ErrorInfoSummary;

  /**
   * Additional "user data" that is dependent on the
   * state transition.
   *
   * Usage should be avoided.
   *
   * Currently used to notify the iOS app about
   * the KYC URL.
   */
  experimentalUserData?: any;
}

export interface ExchangeStateTransitionNotification {
  type: NotificationType.ExchangeStateTransition;
  /**
   * Identification of the exchange entry that this
   * notification is about.
   */
  exchangeBaseUrl: string;

  /**
   * If missing, the notification means that
   * the exchange entry is newly created.
   */
  oldExchangeState?: ExchangeEntryState;

  /**
   * New state of the exchange.
   */
  newExchangeState: ExchangeEntryState;

  /**
   * Summary of the error that occurred when trying to update the exchange entry,
   * if applicable.
   */
  errorInfo?: ErrorInfoSummary;
}

export interface BalanceChangeNotification {
  type: NotificationType.BalanceChange;

  /**
   * Transaction ID of the transaction that caused the balance update.
   *
   * Only used as a hint for debugging, should not be relied upon by clients.
   */
  hintTransactionId: string;
}

export interface TaskProgressNotification {
  type: NotificationType.TaskObservabilityEvent;
  taskId: string;
  event: ObservabilityEvent;
}

export interface RequestProgressNotification {
  type: NotificationType.RequestObservabilityEvent;
  requestId: string;
  operation: string;
  event: ObservabilityEvent;
}

export enum ObservabilityEventType {
  HttpFetchStart = "http-fetch-start",
  HttpFetchFinishError = "http-fetch-finish-error",
  HttpFetchFinishSuccess = "http-fetch-finish-success",
  DbQueryStart = "db-query-start",
  DbQueryFinishSuccess = "db-query-finish-success",
  DbQueryFinishError = "db-query-finish-error",
  RequestStart = "request-start",
  RequestFinishSuccess = "request-finish-success",
  RequestFinishError = "request-finish-error",
  TaskStart = "task-start",
  TaskStop = "task-stop",
  TaskReset = "task-reset",
  ShepherdTaskResult = "sheperd-task-result",
  DeclareTaskDependency = "declare-task-dependency",
  CryptoStart = "crypto-start",
  CryptoFinishSuccess = "crypto-finish-success",
  CryptoFinishError = "crypto-finish-error",
}

export type ObservabilityEvent =
  | {
      id: string;
      when: AbsoluteTime;
      type: ObservabilityEventType.HttpFetchStart;
      url: string;
    }
  | {
      id: string;
      when: AbsoluteTime;
      type: ObservabilityEventType.HttpFetchFinishSuccess;
      url: string;
      status: number;
    }
  | {
      id: string;
      when: AbsoluteTime;
      type: ObservabilityEventType.HttpFetchFinishError;
      url: string;
      error: TalerErrorDetail;
    }
  | {
      type: ObservabilityEventType.DbQueryStart;
      name: string;
      location: string;
    }
  | {
      type: ObservabilityEventType.DbQueryFinishSuccess;
      name: string;
      location: string;
    }
  | {
      type: ObservabilityEventType.DbQueryFinishError;
      name: string;
      location: string;
    }
  | {
      type: ObservabilityEventType.RequestStart;
    }
  | {
      type: ObservabilityEventType.RequestFinishSuccess;
    }
  | {
      type: ObservabilityEventType.RequestFinishError;
    }
  | {
      type: ObservabilityEventType.TaskStart;
      taskId: string;
    }
  | {
      type: ObservabilityEventType.TaskStop;
      taskId: string;
    }
  | {
      type: ObservabilityEventType.TaskReset;
      taskId: string;
    }
  | {
      type: ObservabilityEventType.DeclareTaskDependency;
      taskId: string;
    }
  | {
      type: ObservabilityEventType.CryptoStart;
      operation: string;
    }
  | {
      type: ObservabilityEventType.CryptoFinishSuccess;
      operation: string;
    }
  | {
      type: ObservabilityEventType.CryptoFinishError;
      operation: string;
    }
  | {
      type: ObservabilityEventType.ShepherdTaskResult;
      resultType: string;
    };

export interface BackupOperationErrorNotification {
  type: NotificationType.BackupOperationError;
  error: TalerErrorDetail;
}
/**
 * This notification is required to signal UI that
 * the withdrawal operation changed the state.
 *
 * https://bugs.gnunet.org/view.php?id=8099
 */
export interface WithdrawalOperationTransitionNotification {
  type: NotificationType.WithdrawalOperationTransition;
  uri: string;
}

export type WalletNotification =
  | BalanceChangeNotification
  | WithdrawalOperationTransitionNotification
  | BackupOperationErrorNotification
  | ExchangeStateTransitionNotification
  | TransactionStateTransitionNotification
  | TaskProgressNotification
  | RequestProgressNotification;