/**
 * Shared provider HTTP error normalization helpers.
 *
 * Transport adapters use this module to turn provider-specific response bodies,
 * request ids, and binary payload guardrails into stable OpenClaw error shapes.
 */
import { asOptionalRecord } from "@openclaw/normalization-core/record-coerce";
import { truncateUtf16Safe } from "@openclaw/normalization-core/utf16-slice";
export { asFiniteNumber } from "../../packages/normalization-core/src/number-coercion.js";
import { normalizeOptionalString as trimToUndefined } from "../../packages/normalization-core/src/string-coerce.js";
import {
  readResponseTextPrefix,
  readResponseWithLimit,
  type ReadResponseTextPrefixOptions,
} from "../infra/http-body.js";
import { redactSensitiveText } from "../logging/redact.js";
export { asBoolean } from "../utils/boolean.js";
export { normalizeOptionalString as trimToUndefined } from "../../packages/normalization-core/src/string-coerce.js";

const ERROR_BODY_METADATA_LIMIT = 500;
const PROVIDER_BINARY_RESPONSE_MAX_BYTES = 16 * 1024 * 1024;
const PROVIDER_JSON_RESPONSE_MAX_BYTES = 16 * 1024 * 1024;
const PROVIDER_TEXT_RESPONSE_MAX_BYTES = 16 * 1024 * 1024;

/** Shared timeout and byte-limit options for provider response consumption. */
type ProviderResponseReadOptions = ReadResponseTextPrefixOptions & {
  maxBytes?: number;
  onOverflow?: (params: { size: number; maxBytes: number; res: Response }) => Error;
};

/** Options for bounded provider error-body normalization. */
type ProviderHttpErrorOptions = {
  statusPrefix?: string;
  bodyTimeoutMs?: ReadResponseTextPrefixOptions["timeoutMs"];
  onBodyTimeout?: NonNullable<ReadResponseTextPrefixOptions["onTimeout"]>;
};

class ProviderErrorBodyTimeout extends Error {
  readonly timeoutError: unknown;

  constructor(timeoutError: unknown) {
    super(timeoutError instanceof Error ? timeoutError.message : String(timeoutError), {
      cause: timeoutError,
    });
    this.name = "ProviderErrorBodyTimeout";
    this.timeoutError = timeoutError;
  }
}

/** Trims provider error details to a log- and prompt-safe preview length. */
export function truncateErrorDetail(detail: string, limit = 220): string {
  return detail.length <= limit ? detail : `${truncateUtf16Safe(detail, limit - 1)}…`;
}

/** Redacts secrets before preserving a bounded provider error body preview. */
function redactProviderErrorBody(body: string): string {
  return truncateErrorDetail(redactSensitiveText(body), ERROR_BODY_METADATA_LIMIT);
}

/** Reads at most `limitBytes` from a response body without buffering provider-sized failures. */
export async function readResponseTextLimited(
  response: Response,
  limitBytes = 16 * 1024,
  options?: ReadResponseTextPrefixOptions,
): Promise<string> {
  if (limitBytes <= 0) {
    return "";
  }
  return (
    await readResponseTextPrefix(response, limitBytes, {
      chunkTimeoutMs: options?.chunkTimeoutMs ?? 10_000,
      onIdleTimeout:
        options?.onIdleTimeout ??
        (({ chunkTimeoutMs }) => new Error(`error body read stalled for ${chunkTimeoutMs}ms`)),
      timeoutMs: options?.timeoutMs,
      onTimeout: options?.onTimeout,
    })
  ).text;
}

/** Reads a successful provider text response under a byte cap. */
export async function readProviderTextResponse(
  response: Response,
  label: string,
  opts?: ProviderResponseReadOptions,
): Promise<string> {
  const maxBytes = opts?.maxBytes ?? PROVIDER_TEXT_RESPONSE_MAX_BYTES;
  const bytes = await readResponseWithLimit(response, maxBytes, {
    chunkTimeoutMs: opts?.chunkTimeoutMs ?? 30_000,
    onIdleTimeout:
      opts?.onIdleTimeout ??
      (({ chunkTimeoutMs }) =>
        new Error(`${label}: response body stalled for ${chunkTimeoutMs}ms`)),
    timeoutMs: opts?.timeoutMs,
    onTimeout: opts?.onTimeout,
    onOverflow: ({ maxBytes: maxBytesLocal }) =>
      new Error(`${label}: text response exceeds ${maxBytesLocal} bytes`),
  });
  return new TextDecoder().decode(bytes);
}

/** Formats common provider JSON error payload shapes into one readable detail string. */
export function formatProviderErrorPayload(payload: unknown): string | undefined {
  const root = asOptionalRecord(payload);
  const detailObject = asOptionalRecord(root?.detail);
  const subject = asOptionalRecord(root?.error) ?? detailObject ?? root;
  if (!subject) {
    return undefined;
  }
  const errorDescription =
    trimToUndefined(subject.error_description) ?? trimToUndefined(root?.error_description);
  const oauthCode = errorDescription ? trimToUndefined(root?.error) : undefined;
  const message =
    trimToUndefined(subject.message) ??
    trimToUndefined(subject.detail) ??
    errorDescription ??
    trimToUndefined(root?.message) ??
    trimToUndefined(root?.error) ??
    trimToUndefined(root?.detail);
  const type = trimToUndefined(subject.type);
  const code = trimToUndefined(subject.code) ?? trimToUndefined(subject.status) ?? oauthCode;
  const metadata = [type ? `type=${type}` : undefined, code ? `code=${code}` : undefined]
    .filter((value): value is string => Boolean(value))
    .join(", ");
  if (message && metadata) {
    return `${truncateErrorDetail(message)} [${metadata}]`;
  }
  if (message) {
    return truncateErrorDetail(message);
  }
  if (metadata) {
    return `[${metadata}]`;
  }
  return undefined;
}

type ProviderErrorPayloadMetadata = {
  detail?: string;
  code?: string;
  type?: string;
};

function extractProviderErrorPayloadMetadata(payload: unknown): ProviderErrorPayloadMetadata {
  const root = asOptionalRecord(payload);
  const detailObject = asOptionalRecord(root?.detail);
  const subject = asOptionalRecord(root?.error) ?? detailObject ?? root;
  if (!subject) {
    return {};
  }

  const detail = formatProviderErrorPayload(payload);
  const type = trimToUndefined(subject.type);
  const errorDescription =
    trimToUndefined(subject.error_description) ?? trimToUndefined(root?.error_description);
  const oauthCode = errorDescription ? trimToUndefined(root?.error) : undefined;
  const code = trimToUndefined(subject.code) ?? trimToUndefined(subject.status) ?? oauthCode;
  return {
    ...(detail ? { detail: redactSensitiveText(detail) } : {}),
    ...(code ? { code } : {}),
    ...(type ? { type } : {}),
  };
}

/** Metadata extracted from a non-2xx provider response body and headers. */
type ProviderHttpErrorInfo = {
  detail?: string;
  code?: string;
  type?: string;
  body?: string;
  requestId?: string;
};

/** Extracts normalized provider error metadata while keeping the raw body bounded and redacted. */
async function extractProviderErrorInfo(
  response: Response,
  options?: ProviderHttpErrorOptions,
): Promise<ProviderHttpErrorInfo> {
  const bodyTimeoutMs = options?.bodyTimeoutMs;
  const rawBody = trimToUndefined(
    await readResponseTextLimited(response, 16 * 1024, {
      timeoutMs:
        typeof bodyTimeoutMs === "function"
          ? () => {
              try {
                return bodyTimeoutMs();
              } catch (error) {
                throw new ProviderErrorBodyTimeout(error);
              }
            }
          : bodyTimeoutMs,
      onTimeout: (params) =>
        new ProviderErrorBodyTimeout(
          options?.onBodyTimeout?.(params) ??
            new Error(`Provider error body timed out after ${params.timeoutMs}ms`),
        ),
    }).catch((error: unknown) => {
      if (error instanceof ProviderErrorBodyTimeout) {
        throw error.timeoutError;
      }
      return "";
    }),
  );
  const requestId = extractProviderRequestId(response);
  if (!rawBody) {
    return requestId ? { requestId } : {};
  }
  const body = redactProviderErrorBody(rawBody);
  try {
    const metadata = extractProviderErrorPayloadMetadata(JSON.parse(rawBody));
    return {
      ...(metadata.detail ? { detail: metadata.detail } : { detail: body }),
      ...(metadata.code ? { code: metadata.code } : {}),
      ...(metadata.type ? { type: metadata.type } : {}),
      body,
      ...(requestId ? { requestId } : {}),
    };
  } catch {
    return {
      detail: body,
      body,
      ...(requestId ? { requestId } : {}),
    };
  }
}

/** Returns only the normalized provider detail string for callers that do not need metadata. */
export async function extractProviderErrorDetail(response: Response): Promise<string | undefined> {
  return (await extractProviderErrorInfo(response)).detail;
}

/** Reads the provider request id header variants used across model and media APIs. */
export function extractProviderRequestId(response: Response): string | undefined {
  return (
    trimToUndefined(response.headers.get("x-request-id")) ??
    trimToUndefined(response.headers.get("request-id"))
  );
}

/** Error type carrying normalized provider status, request id, code, type, and body metadata. */
export class ProviderHttpError extends Error {
  readonly status: number;
  readonly statusCode: number;
  readonly code?: string;
  readonly errorCode?: string;
  readonly errorType?: string;
  readonly errorBody?: string;
  readonly requestId?: string;

  constructor(
    message: string,
    params: {
      status: number;
      code?: string;
      type?: string;
      body?: string;
      requestId?: string;
    },
  ) {
    super(message);
    this.name = "ProviderHttpError";
    this.status = params.status;
    this.statusCode = params.status;
    this.code = params.code;
    this.errorCode = params.code;
    this.errorType = params.type;
    this.errorBody = params.body;
    this.requestId = params.requestId;
  }
}

/** Builds the human-facing provider HTTP error message from normalized metadata. */
export function formatProviderHttpErrorMessage(params: {
  label: string;
  status: number;
  detail?: string;
  requestId?: string;
  statusPrefix?: string;
}): string {
  const { label, status, detail, requestId, statusPrefix = "" } = params;
  return (
    `${label} (${statusPrefix}${status})` +
    (detail ? `: ${detail}` : "") +
    (requestId ? ` [request_id=${requestId}]` : "")
  );
}

/** Creates a normalized provider HTTP error from a failed response. */
export async function createProviderHttpError(
  response: Response,
  label: string,
  options?: ProviderHttpErrorOptions,
): Promise<Error> {
  const info = await extractProviderErrorInfo(response, options);
  return new ProviderHttpError(
    formatProviderHttpErrorMessage({
      label,
      status: response.status,
      detail: info.detail,
      requestId: info.requestId,
      statusPrefix: options?.statusPrefix,
    }),
    {
      status: response.status,
      code: info.code,
      type: info.type,
      body: info.body,
      requestId: info.requestId,
    },
  );
}

/** Throws a normalized provider error when a fetch response is not OK. */
export async function assertOkOrThrowProviderError(
  response: Response,
  label: string,
  options?: Omit<ProviderHttpErrorOptions, "statusPrefix">,
): Promise<void> {
  if (response.ok) {
    return;
  }
  throw await createProviderHttpError(response, label, options);
}

/** Throws a normalized generic HTTP error when a fetch response is not OK. */
export async function assertOkOrThrowHttpError(
  response: Response,
  label: string,
  options?: Omit<ProviderHttpErrorOptions, "statusPrefix">,
): Promise<void> {
  if (response.ok) {
    return;
  }
  throw await createProviderHttpError(response, label, { ...options, statusPrefix: "HTTP " });
}

/**
 * Parses a provider JSON response under a byte cap and wraps malformed JSON with the caller's label.
 *
 * The body is read through the same bounded reader as binary responses so a provider that streams an
 * unbounded JSON body cannot force the runtime to buffer the whole payload before parsing.
 */
export async function readProviderJsonResponse<T>(
  response: Response,
  label: string,
  opts?: ProviderResponseReadOptions,
): Promise<T> {
  const maxBytes = opts?.maxBytes ?? PROVIDER_JSON_RESPONSE_MAX_BYTES;
  const bytes = await readResponseWithLimit(response, maxBytes, {
    chunkTimeoutMs: opts?.chunkTimeoutMs ?? 30_000,
    onIdleTimeout:
      opts?.onIdleTimeout ??
      (({ chunkTimeoutMs }) =>
        new Error(`${label}: response body stalled for ${chunkTimeoutMs}ms`)),
    timeoutMs: opts?.timeoutMs,
    onTimeout: opts?.onTimeout,
    onOverflow: ({ maxBytes: maxBytesLocal }) =>
      new Error(`${label}: JSON response exceeds ${maxBytesLocal} bytes`),
  });
  try {
    return JSON.parse(new TextDecoder("utf-8", { fatal: true }).decode(bytes)) as T;
  } catch (cause) {
    throw new Error(`${label}: malformed JSON response`, { cause });
  }
}

/** Parses a provider JSON response that must be a top-level object. */
export async function readProviderJsonObjectResponse(
  response: Response,
  label: string,
  opts?: ProviderResponseReadOptions,
): Promise<Record<string, unknown>> {
  const payload = await readProviderJsonResponse<unknown>(response, label, opts);
  const object = asOptionalRecord(payload);
  if (!object) {
    throw new Error(`${label}: malformed JSON response`);
  }
  return object;
}

/** Parses a provider JSON object response and returns an array field. */
export async function readProviderJsonArrayFieldResponse(
  response: Response,
  label: string,
  field: string,
  opts?: ProviderResponseReadOptions,
): Promise<unknown[]> {
  const payload = await readProviderJsonObjectResponse(response, label, opts);
  const value = payload[field];
  if (!Array.isArray(value)) {
    throw new Error(`${label}: malformed JSON response`);
  }
  return value;
}

function normalizeContentType(response: Response): string | undefined {
  const contentType = response.headers.get("content-type")?.split(";")[0]?.trim().toLowerCase();
  return contentType || undefined;
}

/** Rejects text or JSON responses on provider endpoints that should return binary bytes. */
export function assertProviderBinaryResponseContent(
  response: Response,
  label: string,
  kind = "binary",
): void {
  const contentType = normalizeContentType(response);
  if (!contentType) {
    return;
  }
  if (
    contentType === "application/json" ||
    contentType.endsWith("+json") ||
    contentType.startsWith("text/")
  ) {
    throw new Error(`${label}: malformed ${kind} response`);
  }
}

/** Reads a bounded non-empty binary provider response after content-type validation. */
export async function readProviderBinaryResponse(
  response: Response,
  label: string,
  kind = "binary",
  opts?: ProviderResponseReadOptions,
): Promise<Uint8Array> {
  try {
    assertProviderBinaryResponseContent(response, label, kind);
  } catch (error) {
    // A captured response may be teed; do not await cancellation before its
    // rejected branch and dispatcher can be released.
    void response.body?.cancel().catch(() => undefined);
    throw error;
  }
  const maxBytes = opts?.maxBytes ?? PROVIDER_BINARY_RESPONSE_MAX_BYTES;
  const bytes = await readResponseWithLimit(response, maxBytes, {
    ...opts,
    onOverflow:
      opts?.onOverflow ??
      (({ maxBytes: maxBytesLocal }) =>
        new Error(`${label}: ${kind} response exceeds ${maxBytesLocal} bytes`)),
  });
  if (bytes.byteLength === 0) {
    throw new Error(`${label}: malformed ${kind} response`);
  }
  return bytes;
}