import { findCodeRegions, isInsideCode } from "openclaw/plugin-sdk/text-chunking";

const INTERNAL_SEPARATOR_RE = /(?:#\+){2,}#?/;
const ASSISTANT_ROLE_MARKER_RE = /\bassistant\s+to\s*=\s*\w+/i;
// Require closing `>` to avoid false-positives on phrases like "<thought experiment>".
const THINKING_TAG_RE = /<\s*\/?\s*(?:think(?:ing)?|thought|antthinking)\b[^<>]*>/i;
const RELEVANT_MEMORIES_TAG_RE = /<\s*\/?\s*relevant[-_]memories\b[^<>]*>/i;
// Require closing `>` to avoid false-positives on phrases like "<final answer>".
const FINAL_TAG_RE = /<\s*\/?\s*final\b[^<>]*>/i;
const ACP_ERROR_RE = /\bACP error\s*\(\s*ACP_[A-Z0-9_]+\s*\):/i;
const GATEWAY_MISSING_API_KEY_RE = /\bMissing API key for\b.+\bon the gateway\b/i;

const REFLECTION_PATTERNS: Array<{ re: RegExp; label: string }> = [
  { re: INTERNAL_SEPARATOR_RE, label: "internal-separator" },
  { re: ASSISTANT_ROLE_MARKER_RE, label: "assistant-role-marker" },
  { re: THINKING_TAG_RE, label: "thinking-tag" },
  { re: RELEVANT_MEMORIES_TAG_RE, label: "relevant-memories-tag" },
  { re: FINAL_TAG_RE, label: "final-tag" },
  { re: ACP_ERROR_RE, label: "acp-error" },
  { re: GATEWAY_MISSING_API_KEY_RE, label: "gateway-missing-api-key" },
];

type ReflectionDetection = {
  isReflection: boolean;
  matchedLabels: string[];
};

function hasMatchOutsideCode(text: string, re: RegExp): boolean {
  const codeRegions = findCodeRegions(text);
  const globalRe = new RegExp(re.source, re.flags.includes("g") ? re.flags : `${re.flags}g`);

  for (const match of text.matchAll(globalRe)) {
    const start = match.index ?? -1;
    if (start >= 0 && !isInsideCode(start, codeRegions)) {
      return true;
    }
  }

  return false;
}

/**
 * Check whether an inbound message appears to be a reflection of
 * assistant-originated content. Returns matched pattern labels for telemetry.
 */
export function detectReflectedContent(text: string): ReflectionDetection {
  if (!text) {
    return { isReflection: false, matchedLabels: [] };
  }

  const matchedLabels: string[] = [];
  for (const { re, label } of REFLECTION_PATTERNS) {
    if (hasMatchOutsideCode(text, re)) {
      matchedLabels.push(label);
    }
  }

  return {
    isReflection: matchedLabels.length > 0,
    matchedLabels,
  };
}
