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import type { AiErrorCode } from "@/shared/ai";
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import { AiBackendError, AiMisconfiguredError } from "@/worker/lib/ai/types";
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const SAFE_MESSAGES: Record<AiErrorCode, string> = {
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  ai_misconfigured: "AI backend unavailable",
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  ai_not_entitled: "AI action not permitted on this page",
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  ai_chat_failed: "Upstream AI service failed",
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  ai_chat_no_stream: "Upstream AI service did not return a stream",
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  ai_summarize_failed: "Upstream AI service failed",
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  ai_summarize_empty: "Upstream AI service returned an empty response",
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  ai_backend_failed: "Upstream AI service failed",
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  ai_failed: "AI request failed",
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  page_empty: "Page has no body text yet",
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  rate_limited: "Rate limit exceeded",
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  unauthorized: "Authentication required",
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  not_found: "Not found",
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  request_failed: "AI request failed",
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  validation_error: "Invalid request",
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};
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// Routes must use this when sending error text to clients. Raw upstream bodies
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// can include prompts or provider details, so they never leave the worker
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// boundary; only a fixed code-keyed string does. `errorContext(err)` continues
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// to capture whatever the underlying Error carries for server logs.
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export function clientAiErrorMessage(err: unknown): { code: AiErrorCode; message: string } {
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  const code = aiErrorCode(err);
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  return { code, message: SAFE_MESSAGES[code] ?? SAFE_MESSAGES.ai_failed };
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}
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function aiErrorCode(err: unknown): AiErrorCode {
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  if (err instanceof AiBackendError) return err.code;
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  if (err instanceof AiMisconfiguredError) return err.code;
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  return "ai_failed";
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}