import {
  AbsoluteTime,
  Duration,
  OperationAlternative,
  OperationFail,
  OperationOk,
  OperationResult,
  TalerError,
  TalerErrorCode,
  TranslatedString,
} from "@gnu-taler/taler-util";
import { useEffect, useState } from "preact/hooks";
import { ButtonHandler, OnOperationFailReturnType, OnOperationSuccesReturnType } from "../components/Button.js";
import {
  InternationalizationAPI,
  memoryMap,
  useTranslationContext,
} from "../index.browser.js";

export type NotificationMessage = ErrorNotification | InfoNotification;

export interface ErrorNotification {
  type: "error";
  title: TranslatedString;
  ack?: boolean;
  timeout?: boolean;
  description?: TranslatedString;
  debug?: any;
  when: AbsoluteTime;
}
export interface InfoNotification {
  type: "info";
  title: TranslatedString;
  ack?: boolean;
  timeout?: boolean;
  when: AbsoluteTime;
}

const storage = memoryMap<Map<string, NotificationMessage>>();
const NOTIFICATION_KEY = "notification";

export const GLOBAL_NOTIFICATION_TIMEOUT = Duration.fromSpec({
  seconds: 5,
});

function updateInStorage(n: NotificationMessage) {
  const h = hash(n);
  const mem = storage.get(NOTIFICATION_KEY) ?? new Map();
  const newState = new Map(mem);
  newState.set(h, n);
  storage.set(NOTIFICATION_KEY, newState);
}

export function notify(notif: NotificationMessage): void {
  const currentState: Map<string, NotificationMessage> =
    storage.get(NOTIFICATION_KEY) ?? new Map();
  const newState = currentState.set(hash(notif), notif);

  if (GLOBAL_NOTIFICATION_TIMEOUT.d_ms !== "forever") {
    setTimeout(() => {
      notif.timeout = true;
      updateInStorage(notif);
    }, GLOBAL_NOTIFICATION_TIMEOUT.d_ms);
  }

  storage.set(NOTIFICATION_KEY, newState);
}
export function notifyError(
  title: TranslatedString,
  description: TranslatedString | undefined,
  debug?: any,
) {
  notify({
    type: "error" as const,
    title,
    description,
    debug,
    when: AbsoluteTime.now(),
  });
}
export function notifyException(title: TranslatedString, ex: Error) {
  notify({
    type: "error" as const,
    title,
    description: ex.message as TranslatedString,
    debug: ex.stack,
    when: AbsoluteTime.now(),
  });
}
export function notifyInfo(title: TranslatedString) {
  notify({
    type: "info" as const,
    title,
    when: AbsoluteTime.now(),
  });
}

export type Notification = {
  message: NotificationMessage;
  acknowledge: () => void;
};

export function useNotifications(): Notification[] {
  const [, setLastUpdate] = useState<number>();
  const value = storage.get(NOTIFICATION_KEY) ?? new Map();

  useEffect(() => {
    return storage.onUpdate(NOTIFICATION_KEY, () => {
      setLastUpdate(Date.now())
      // const mem = storage.get(NOTIFICATION_KEY) ?? new Map();
      // setter(structuredClone(mem));
    });
  });

  return Array.from(value.values()).map((message, idx) => {
    return {
      message,
      acknowledge: () => {
        message.ack = true;
        updateInStorage(message);
      },
    };
  });
}

function hashCode(str: string): string {
  if (str.length === 0) return "0";
  let hash = 0;
  let chr;
  for (let i = 0; i < str.length; i++) {
    chr = str.charCodeAt(i);
    hash = (hash << 5) - hash + chr;
    hash |= 0; // Convert to 32bit integer
  }
  return hash.toString(16);
}

function hash(msg: NotificationMessage): string {
  let str = (msg.type + ":" + msg.title) as string;
  if (msg.type === "error") {
    if (msg.description) {
      str += ":" + msg.description;
    }
    if (msg.debug) {
      str += ":" + msg.debug;
    }
  }
  return hashCode(str);
}

function errorMap<T extends OperationFail<unknown>>(
  resp: T,
  map: (d: T["case"]) => TranslatedString,
): void {
  notify({
    type: "error",
    title: map(resp.case),
    description: resp.detail.hint as TranslatedString,
    debug: resp.detail,
    when: AbsoluteTime.now(),
  });
}

export type ErrorNotificationHandler = (
  cb: (notify: typeof errorMap) => Promise<void>,
) => Promise<void>;

/**
 * @deprecated use useLocalNotificationHandler
 *
 * @returns
 */
export function useLocalNotification(): [
  Notification | undefined,
  (n: NotificationMessage) => void,
  ErrorNotificationHandler,
] {
  const { i18n } = useTranslationContext();

  const [value, setter] = useState<NotificationMessage>();
  const notif = !value
    ? undefined
    : {
      message: value,
      acknowledge: () => {
        setter(undefined);
      },
    };

  async function errorHandling(cb: (notify: typeof errorMap) => Promise<void>) {
    try {
      return await cb(errorMap);
    } catch (error: unknown) {
      if (error instanceof TalerError) {
        notify(buildUnifiedRequestErrorMessage(i18n, error));
      } else {
        notifyError(
          i18n.str`Operation failed, please report`,
          (error instanceof Error
            ? error.message
            : JSON.stringify(error)) as TranslatedString,
        );
      }
    }
  }
  return [notif, setter, errorHandling];
}

type HandlerMaker = <T extends OperationResult<A, B>, A, B>(
  onClick: () => Promise<T | undefined>,
  onOperationSuccess: OnOperationSuccesReturnType<T>,
  onOperationFail: OnOperationFailReturnType<T>,
  onOperationComplete?: () => void,
) => ButtonHandler<T, A, B>;

export function useLocalNotificationHandler(): [
  Notification | undefined,
  HandlerMaker,
  (n: NotificationMessage) => void,
] {
  const [value, setter] = useState<NotificationMessage>();
  const notif = !value
    ? undefined
    : {
      message: value,
      acknowledge: () => {
        setter(undefined);
      },
    };

  function makeHandler<T extends OperationResult<A, B>, A, B>(
    onClick: () => Promise<T | undefined>,
    onOperationSuccess:OnOperationSuccesReturnType<T>,
    onOperationFail: OnOperationFailReturnType<T>,
    onOperationComplete?: () => void,
  ): ButtonHandler<T, A, B> {
    return {
      onClick,
      onNotification: setter,
      onOperationFail,
      onOperationSuccess,
      onOperationComplete,
    };
  }

  return [notif, makeHandler, setter];
}

export function buildUnifiedRequestErrorMessage(
  i18n: InternationalizationAPI,
  cause: TalerError,
): ErrorNotification {
  let result: ErrorNotification;
  switch (cause.errorDetail.code) {
    case TalerErrorCode.GENERIC_TIMEOUT: {
      result = {
        type: "error",
        title: i18n.str`Request timeout`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.GENERIC_CLIENT_INTERNAL_ERROR: {
      result = {
        type: "error",
        title: i18n.str`Request cancelled`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.WALLET_HTTP_REQUEST_GENERIC_TIMEOUT: {
      result = {
        type: "error",
        title: i18n.str`Request timeout`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.WALLET_HTTP_REQUEST_THROTTLED: {
      result = {
        type: "error",
        title: i18n.str`Request throttled`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.WALLET_RECEIVED_MALFORMED_RESPONSE: {
      result = {
        type: "error",
        title: i18n.str`Malformed response`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.WALLET_NETWORK_ERROR: {
      result = {
        type: "error",
        title: i18n.str`Network error`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    case TalerErrorCode.WALLET_UNEXPECTED_REQUEST_ERROR: {
      result = {
        type: "error",
        title: i18n.str`Unexpected request error`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
    default: {
      result = {
        type: "error",
        title: i18n.str`Unexpected error`,
        description: cause.message as TranslatedString,
        debug: JSON.stringify(cause.errorDetail, undefined, 2),
        when: AbsoluteTime.now(),
      };
      break;
    }
  }
  return result;
}