/**
 * Manual upload of a push-channel AlertSearch authorization, for the
 * notification debug panel: mint a delegated JWT batch for the active identity
 * and `PUT /notifications/alert-authorization`, with the send time fixed at
 * 09:00 in the device's zone.
 *
 * The SMS channel uploads the same body through `authorizeSmsAlertSearch`, and
 * both mint with `mintAlertAuthorizationBatch`. The wire shapes are in
 * `@/interfaces/notifyApi`.
 */

import type { AlertAuthorizationRequestBody } from "@/interfaces/notifyApi";
import { ETHR_DID_PREFIX } from "@/libs/crypto/vc";
import {
  ALERT_AUTHORIZATION_BATCH_DAYS,
  type AlertAuthorizationBatch,
  mintAlertAuthorizationBatch,
} from "./alertAuthorizationBatch";
import { alertSearchNotifyTimeUtcFromLocalNineAm } from "./alertSearchNotifyTime";
import { getNotificationApiBaseUrl } from "./NotificationDebugConfig";
import {
  getActiveNotificationDid,
  getNotificationApiHeaders,
  httpAuthErrorMessage,
} from "./notificationApiAuth";
import { shouldBypassNotificationAuth } from "./notificationApiDebugMode";

export type AlertAuthorizationUploadResult =
  | {
      ok: true;
      status: number;
      batchId: string;
      timezone: string;
      jwtCount: number;
      firstDay: string;
      lastDay: string;
    }
  | {
      ok: false;
      errorMessage: string;
      status?: number;
      errorCode?: string;
    };

type FetchNotificationApi = (
  input: RequestInfo | URL,
  init?: RequestInit,
) => Promise<Response>;

export interface AlertAuthorizationDependencies {
  getActiveDid: () => Promise<string | null>;
  isAuthBypassEnabled: () => boolean;
  mintBatch: (did: string) => Promise<AlertAuthorizationBatch>;
  /** IANA zone whose 09:00 becomes the batch's UTC send time. */
  getTimeZone: () => string;
  getAuthHeaders: typeof getNotificationApiHeaders;
  getBaseUrl: () => string;
  fetch: FetchNotificationApi;
}

const defaultDependencies: AlertAuthorizationDependencies = {
  getActiveDid: getActiveNotificationDid,
  isAuthBypassEnabled: shouldBypassNotificationAuth,
  mintBatch: (did) => mintAlertAuthorizationBatch(did),
  getTimeZone: () => Intl.DateTimeFormat().resolvedOptions().timeZone,
  getAuthHeaders: getNotificationApiHeaders,
  getBaseUrl: getNotificationApiBaseUrl,
  fetch: (input, init) => globalThis.fetch(input, init),
};

function buildRequestBody(
  batch: AlertAuthorizationBatch,
  timeZone: string,
): AlertAuthorizationRequestBody {
  if (batch.jwts.length !== ALERT_AUTHORIZATION_BATCH_DAYS) {
    throw new Error(
      `Expected ${ALERT_AUTHORIZATION_BATCH_DAYS} delegated JWTs, received ${batch.jwts.length}.`,
    );
  }

  const notifyTime = alertSearchNotifyTimeUtcFromLocalNineAm(timeZone);

  return {
    batchId: batch.batchId,
    notifyHourUtc: notifyTime.notifyHourUtc,
    notifyMinuteUtc: notifyTime.notifyMinuteUtc,
    timezone: timeZone,
    jwts: batch.jwts,
  };
}

/**
 * The code and message of a refusal, and nothing else from its body. The
 * service sends an `AlertAuthorizationFailure`: the code, when there is one,
 * under `error`, and the sentence under `message`.
 */
async function readRefusal(
  response: Response,
): Promise<{ message?: string; errorCode?: string }> {
  let body: unknown;
  try {
    body = await response.json();
  } catch {
    return {};
  }
  if (typeof body !== "object" || body === null) {
    return {};
  }

  const { error, message } = body as { error?: unknown; message?: unknown };
  return {
    ...(typeof message === "string" && message.trim()
      ? { message: message.trim() }
      : {}),
    ...(typeof error === "string" && error.trim()
      ? { errorCode: error.trim() }
      : {}),
  };
}

/**
 * Mint and manually upload a delegated AlertSearch authorization batch.
 * This function never retries and refuses notification auth bypass mode.
 */
export async function uploadAlertSearchAuthorization(
  dependencies: AlertAuthorizationDependencies = defaultDependencies,
): Promise<AlertAuthorizationUploadResult> {
  try {
    const did = await dependencies.getActiveDid();
    if (!did) {
      return { ok: false, errorMessage: "No active identity is available." };
    }
    if (!did.startsWith(ETHR_DID_PREFIX)) {
      return {
        ok: false,
        errorMessage:
          "AlertSearch authorization requires an active did:ethr identity.",
      };
    }
    if (dependencies.isAuthBypassEnabled()) {
      return {
        ok: false,
        errorMessage:
          "AlertSearch authorization cannot be uploaded while JWT authentication is skipped.",
      };
    }

    const batch = await dependencies.mintBatch(did);
    const timeZone = dependencies.getTimeZone();
    const body = buildRequestBody(batch, timeZone);

    const auth = await dependencies.getAuthHeaders(undefined, did);
    if (!auth.ok) {
      return {
        ok: false,
        errorMessage: `Authentication unavailable: ${auth.message}`,
      };
    }
    if (!auth.authenticated) {
      return {
        ok: false,
        errorMessage:
          "AlertSearch authorization requires authenticated notification API headers.",
      };
    }

    const response = await dependencies.fetch(
      `${dependencies.getBaseUrl()}/notifications/alert-authorization`,
      {
        method: "PUT",
        headers: auth.headers,
        body: JSON.stringify(body),
      },
    );

    if (!response.ok) {
      const refusal = await readRefusal(response);
      const fallback =
        response.status === 401 || response.status === 403
          ? httpAuthErrorMessage(response.status)
          : `HTTP ${response.status}`;
      return {
        ok: false,
        status: response.status,
        errorMessage: refusal.message || fallback,
        ...(refusal.errorCode ? { errorCode: refusal.errorCode } : {}),
      };
    }

    return {
      ok: true,
      status: response.status,
      batchId: body.batchId,
      timezone: timeZone,
      jwtCount: body.jwts.length,
      firstDay: body.jwts[0]!.day,
      lastDay: body.jwts[body.jwts.length - 1]!.day,
    };
  } catch (error: unknown) {
    return {
      ok: false,
      errorMessage: error instanceof Error ? error.message : "Upload failed.",
    };
  }
}