#!/usr/bin/env node
// ==============================================================================
// 用途：角色記憶的 transcript 處理工具。負責 (1) 從 Claude Code／Codex
//       JSONL 抽出「本輪」對話片段（最後一筆使用者訊息之後的全部內容），
//       (2) 估算本輪花費時間，(3) 對文字做機密遮蔽（token／密碼／PII），
//       作為寫入記憶檔前的第二道防線。
// 更新時間：2026/07/28 12:21:11
// 相依：Node.js 標準庫。抽取與遮蔽全程僅走 stdin／stdout，本檔不寫任何檔案。
// ==============================================================================

const fs = require("fs");

const TOOL_RESULT_LIMIT = 200;
const TOOL_INPUT_LIMIT = 160;
const TOTAL_LIMIT = 24000;

const REDACT_PATTERNS = [
  [/[A-Za-z0-9_-]*:[A-Za-z0-9_-]{16,}@/g, "***@"],
  [/\b[0-9a-f]{40}\b/g, "***"],
  [/\bgh[pousr]_[A-Za-z0-9_]{16,}\b/g, "***"],
  [/\bsk-[A-Za-z0-9\-_]{16,}\b/g, "***"],
  [/\b(token|password|passwd|pwd|secret|api[_-]?key)\b\s*[:=]\s*\S+/gi, "$1=***"],
  [/Authorization:\s*(token|bearer)\s+\S+/gi, "Authorization: $1 ***"],
  [/[A-Za-z0-9._%+\-]+@[A-Za-z0-9.\-]+\.[A-Za-z]{2,}/g, "***"],
  [/\b09\d{2}[-\s]?\d{3}[-\s]?\d{3}\b/g, "***"],
  [/\b[A-Z][12]\d{8}\b/g, "***"],
];

function readStdin() {
  try {
    return fs.readFileSync(0, "utf8");
  } catch {
    return "";
  }
}

function redact(text) {
  let output = String(text || "");
  for (const [pattern, replacement] of REDACT_PATTERNS) {
    output = output.replace(pattern, replacement);
  }
  return output;
}

function isObject(value) {
  return value && typeof value === "object" && !Array.isArray(value);
}

function isRealUserMessage(entry) {
  const payload = entry.payload;
  if (isObject(payload) && entry.type === "event_msg") {
    return payload.type === "user_message" && Boolean(String(payload.message || "").trim());
  }
  if (entry.type !== "user") return false;
  const content = entry.message?.content;
  if (typeof content === "string") return Boolean(content.trim());
  if (Array.isArray(content)) return content.some((block) => isObject(block) && block.type === "text");
  return false;
}

function blocks(entry) {
  const content = entry.message?.content;
  if (typeof content === "string") return [{ type: "text", text: content }];
  return Array.isArray(content) ? content : [];
}

function payloadTextBlocks(content) {
  if (typeof content === "string") return [content];
  if (!Array.isArray(content)) return [];
  const texts = [];
  for (const block of content) {
    if (!isObject(block)) continue;
    if (["input_text", "output_text", "text"].includes(block.type)) {
      const text = String(block.text || "").trim();
      if (text) texts.push(text);
    }
  }
  return texts;
}

function renderCodexPayload(entry) {
  const payload = entry.payload;
  if (!isObject(payload)) return [];

  const lines = [];
  const entryType = entry.type;
  const payloadType = payload.type;

  if (entryType === "event_msg") {
    if (payloadType === "user_message") {
      const message = String(payload.message || "").trim();
      if (message) lines.push(`[user] ${message}`);
    } else if (payloadType === "agent_message") {
      const message = String(payload.message || "").trim();
      if (message) lines.push(`[assistant:${payload.phase || "assistant"}] ${message}`);
    }
    return lines;
  }

  if (entryType !== "response_item") return lines;
  if (payloadType === "message") {
    const role = payload.role || "assistant";
    if (role === "system" || role === "developer") return lines;
    for (const text of payloadTextBlocks(payload.content)) {
      if (role === "user" && text.trimStart().startsWith("<skill>")) continue;
      if (role === "user" && text.trimStart().startsWith("<environment_context>")) continue;
      lines.push(`[${role}] ${text}`);
    }
  } else if (payloadType === "function_call") {
    const raw = String(payload.arguments || "").trim().replace(/\n/g, " ");
    lines.push(`[tool:${payload.name || "?"}] ${raw.slice(0, TOOL_INPUT_LIMIT)}`);
  } else if (payloadType === "function_call_output") {
    const raw = String(payload.output || "").trim().replace(/\n/g, " ");
    if (raw) lines.push(`[result] ${raw.slice(0, TOOL_RESULT_LIMIT)}`);
  }
  return lines;
}

function render(entry) {
  const codexLines = renderCodexPayload(entry);
  if (codexLines.length) return codexLines;

  const role = entry.type;
  const lines = [];
  for (const block of blocks(entry)) {
    if (!isObject(block)) continue;
    if (block.type === "text") {
      const text = String(block.text || "").trim();
      if (text) lines.push(`[${role}] ${text}`);
    } else if (block.type === "tool_use") {
      const raw = JSON.stringify(block.input || {});
      lines.push(`[tool:${block.name || "?"}] ${raw.slice(0, TOOL_INPUT_LIMIT)}`);
    } else if (block.type === "tool_result") {
      let raw = block.content;
      if (Array.isArray(raw)) {
        raw = raw.map((item) => (isObject(item) && item.type === "text" ? item.text || "" : "")).join(" ");
      }
      raw = String(raw || "").trim().replace(/\n/g, " ");
      if (raw) lines.push(`[result] ${raw.slice(0, TOOL_RESULT_LIMIT)}`);
    }
  }
  return lines;
}

function readEntries(filePath) {
  let raw;
  try {
    raw = fs.readFileSync(filePath, "utf8");
  } catch {
    return [];
  }
  const entries = [];
  for (const line of raw.split(/\r?\n/)) {
    if (!line.trim()) continue;
    try {
      entries.push(JSON.parse(line));
    } catch {}
  }
  return entries;
}

function turnStartIndex(entries) {
  for (let index = entries.length - 1; index >= 0; index -= 1) {
    if (isRealUserMessage(entries[index])) return index;
  }
  return 0;
}

function parseTimestamp(value) {
  if (typeof value !== "string" || !value.trim()) return null;
  const ms = Date.parse(value.trim());
  return Number.isNaN(ms) ? null : new Date(ms);
}

function entryTimestamp(entry) {
  for (const key of ["timestamp", "created_at", "time"]) {
    const dt = parseTimestamp(entry[key]);
    if (dt) return dt;
  }
  if (isObject(entry.message)) {
    for (const key of ["timestamp", "created_at", "time"]) {
      const dt = parseTimestamp(entry.message[key]);
      if (dt) return dt;
    }
  }
  return null;
}

function formatDuration(seconds) {
  if (seconds < 0) return "未判定";
  const minutes = Math.round(seconds / 60);
  if (minutes <= 0) return "1 分鐘內";
  const hours = Math.floor(minutes / 60);
  const mins = minutes % 60;
  if (hours && mins) return `${hours} 小時 ${mins} 分鐘`;
  if (hours) return `${hours} 小時`;
  return `${mins} 分鐘`;
}

function turnDuration(filePath) {
  const entries = readEntries(filePath);
  if (!entries.length) return "未判定";
  const start = turnStartIndex(entries);
  const stamps = entries.slice(start).map(entryTimestamp).filter(Boolean);
  if (stamps.length < 2) return "未判定";
  const min = Math.min(...stamps.map((dt) => dt.getTime()));
  const max = Math.max(...stamps.map((dt) => dt.getTime()));
  return formatDuration((max - min) / 1000);
}

function extractTurn(filePath) {
  const entries = readEntries(filePath);
  if (!entries.length) return "";
  const start = turnStartIndex(entries);
  const lines = [];
  for (const entry of entries.slice(start)) lines.push(...render(entry));
  let text = lines.join("\n").trim();
  if (text.length > TOTAL_LIMIT) {
    const half = Math.floor(TOTAL_LIMIT / 2);
    text = `${text.slice(0, half)}\n…（中段省略）…\n${text.slice(-half)}`;
  }
  return text;
}

const USAGE = `用法：transcript.js <子命令> [參數]

  extract <transcript 路徑>   抽出本輪內容並遮蔽機密後輸出到 stdout
  duration <transcript 路徑>  估算本輪花費時間，無法判定時輸出「未判定」
  redact                      自 stdin 讀取文字，遮蔽機密後輸出到 stdout
`;

function main(argv) {
  if (!argv.length || argv[0] === "-h" || argv[0] === "--help") {
    process.stdout.write(USAGE);
    return 0;
  }
  if (argv[0] === "extract") {
    if (argv.length < 2) return 2;
    const text = extractTurn(argv[1]);
    if (!text) return 1;
    process.stdout.write(redact(text));
    return 0;
  }
  if (argv[0] === "duration") {
    if (argv.length < 2) return 2;
    process.stdout.write(turnDuration(argv[1]));
    return 0;
  }
  if (argv[0] === "redact") {
    process.stdout.write(redact(readStdin()));
    return 0;
  }
  process.stdout.write(USAGE);
  return 2;
}

process.exit(main(process.argv.slice(2)));