// Assembles a redacted debug snapshot of the /ask chat — the conversation state
// plus a trace of recent raw provider calls (request / response / finish reason)
// — as a pretty JSON string for offline debugging (truncation, empty answers,
// "trapped in context"). Pure + unit-testable. An API key is NEVER included: the
// inputs don't carry one, and `redactKeys` scrubs anything key-shaped as a
// defense-in-depth backstop.

import type { UiMessage } from "./askConversation";
import type { DebugCall } from "./askProvider";

export type DebugExportInput = {
  provider: string;
  model: string;
  searchMode: string;
  markdownOn: boolean;
  reportMode: boolean;
  strictGrounding: boolean;
  detached: boolean;
  maxAnswerTokens: number;
  messages: UiMessage[];
  report: string;
  grounding: { label: string; videoCount: number; truncated: boolean } | null;
  contextOverride: string | null;
  trace: DebugCall[];
  now?: number; // injectable timestamp for tests
};

// Provider API-key shapes: Anthropic (sk-ant-…), OpenAI (sk-…), Gemini (AIza…).
const KEY_PATTERNS = [
  /sk-ant-[A-Za-z0-9_-]{10,}/g,
  /sk-[A-Za-z0-9_-]{16,}/g,
  /AIza[A-Za-z0-9_-]{10,}/g,
];

export function redactKeys(s: string): string {
  return KEY_PATTERNS.reduce((acc, re) => acc.replace(re, "[REDACTED]"), s);
}

export function buildDebugExport(input: DebugExportInput): string {
  const obj = {
    meta: {
      kind: "ytdlp-transcript-browser/ask-debug",
      version: 1,
      exportedAt: new Date(input.now ?? Date.now()).toISOString(),
      provider: input.provider,
      model: input.model,
      searchMode: input.searchMode,
      markdownOn: input.markdownOn,
      reportMode: input.reportMode,
      strictGrounding: input.strictGrounding,
      detached: input.detached,
      maxAnswerTokens: input.maxAnswerTokens,
    },
    grounding: input.grounding,
    contextOverride: input.contextOverride,
    report: input.report,
    messages: input.messages,
    // Recent raw provider calls (finish reasons, payloads). No API key.
    trace: input.trace,
  };
  return redactKeys(JSON.stringify(obj, null, 2));
}